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/device.h>
  28
  29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  30 MODULE_DESCRIPTION("Joystick device interfaces");
  31 MODULE_SUPPORTED_DEVICE("input/js");
  32 MODULE_LICENSE("GPL");
  33
  34 #define JOYDEV_MINOR_BASE       0
  35 #define JOYDEV_MINORS           16
  36 #define JOYDEV_BUFFER_SIZE      64
  37
  38 struct joydev {
  39         int exist;
  40         int open;
  41         int minor;
  42         char name[16];
  43         struct input_handle handle;
  44         wait_queue_head_t wait;
  45         struct list_head client_list;
  46         struct device dev;
  47
  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_client {
  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         return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
  86 }
  87
  88 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  89 {
  90         struct joydev *joydev = handle->private;
  91         struct joydev_client *client;
  92         struct js_event event;
  93
  94         switch (type) {
  95
  96                 case EV_KEY:
  97                         if (code < BTN_MISC || value == 2)
  98                                 return;
  99                         event.type = JS_EVENT_BUTTON;
 100                         event.number = joydev->keymap[code - BTN_MISC];
 101                         event.value = value;
 102                         break;
 103
 104                 case EV_ABS:
 105                         event.type = JS_EVENT_AXIS;
 106                         event.number = joydev->absmap[code];
 107                         event.value = joydev_correct(value, joydev->corr + event.number);
 108                         if (event.value == joydev->abs[event.number])
 109                                 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(client, &joydev->client_list, node) {
 120
 121                 memcpy(client->buffer + client->head, &event, sizeof(struct js_event));
 122
 123                 if (client->startup == joydev->nabs + joydev->nkey)
 124                         if (client->tail == (client->head = (client->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
 125                                 client->startup = 0;
 126
 127                 kill_fasync(&client->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_client *client = file->private_data;
 137
 138         retval = fasync_helper(fd, file, on, &client->fasync);
 139
 140         return retval < 0 ? retval : 0;
 141 }
 142
 143 static void joydev_free(struct device *dev)
 144 {
 145         struct joydev *joydev = container_of(dev, struct joydev, dev);
 146
 147         joydev_table[joydev->minor] = NULL;
 148         kfree(joydev);
 149 }
 150
 151 static int joydev_release(struct inode *inode, struct file *file)
 152 {
 153         struct joydev_client *client = file->private_data;
 154         struct joydev *joydev = client->joydev;
 155
 156         joydev_fasync(-1, file, 0);
 157
 158         list_del(&client->node);
 159         kfree(client);
 160
 161         if (!--joydev->open && joydev->exist)
 162                 input_close_device(&joydev->handle);
 163
 164         put_device(&joydev->dev);
 165
 166         return 0;
 167 }
 168
 169 static int joydev_open(struct inode *inode, struct file *file)
 170 {
 171         struct joydev_client *client;
 172         struct joydev *joydev;
 173         int i = iminor(inode) - JOYDEV_MINOR_BASE;
 174         int error;
 175
 176         if (i >= JOYDEV_MINORS)
 177                 return -ENODEV;
 178
 179         joydev = joydev_table[i];
 180         if (!joydev || !joydev->exist)
 181                 return -ENODEV;
 182
 183         get_device(&joydev->dev);
 184
 185         client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
 186         if (!client) {
 187                 error = -ENOMEM;
 188                 goto err_put_joydev;
 189         }
 190
 191         client->joydev = joydev;
 192         list_add_tail(&client->node, &joydev->client_list);
 193
 194         if (!joydev->open++ && joydev->exist) {
 195                 error = input_open_device(&joydev->handle);
 196                 if (error)
 197                         goto err_free_client;
 198         }
 199
 200         file->private_data = client;
 201         return 0;
 202
 203  err_free_client:
 204         list_del(&client->node);
 205         kfree(client);
 206  err_put_joydev:
 207         put_device(&joydev->dev);
 208         return error;
 209 }
 210
 211 static ssize_t joydev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 212 {
 213         return -EINVAL;
 214 }
 215
 216 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 217 {
 218         struct joydev_client *client = file->private_data;
 219         struct joydev *joydev = client->joydev;
 220         struct input_dev *input = joydev->handle.dev;
 221         int retval = 0;
 222
 223         if (!joydev->exist)
 224                 return -ENODEV;
 225
 226         if (count < sizeof(struct js_event))
 227                 return -EINVAL;
 228
 229         if (count == sizeof(struct JS_DATA_TYPE)) {
 230
 231                 struct JS_DATA_TYPE data;
 232                 int i;
 233
 234                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
 235                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
 236                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
 237                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
 238
 239                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 240                         return -EFAULT;
 241
 242                 client->startup = 0;
 243                 client->tail = client->head;
 244
 245                 return sizeof(struct JS_DATA_TYPE);
 246         }
 247
 248         if (client->startup == joydev->nabs + joydev->nkey &&
 249             client->head == client->tail && (file->f_flags & O_NONBLOCK))
 250                 return -EAGAIN;
 251
 252         retval = wait_event_interruptible(joydev->wait,
 253                                           !joydev->exist ||
 254                                           client->startup < joydev->nabs + joydev->nkey ||
 255                                           client->head != client->tail);
 256         if (retval)
 257                 return retval;
 258
 259         if (!joydev->exist)
 260                 return -ENODEV;
 261
 262         while (client->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
 263
 264                 struct js_event event;
 265
 266                 event.time = jiffies_to_msecs(jiffies);
 267
 268                 if (client->startup < joydev->nkey) {
 269                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
 270                         event.number = client->startup;
 271                         event.value = !!test_bit(joydev->keypam[event.number], input->key);
 272                 } else {
 273                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
 274                         event.number = client->startup - joydev->nkey;
 275                         event.value = joydev->abs[event.number];
 276                 }
 277
 278                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 279                         return -EFAULT;
 280
 281                 client->startup++;
 282                 retval += sizeof(struct js_event);
 283         }
 284
 285         while (client->head != client->tail && retval + sizeof(struct js_event) <= count) {
 286
 287                 if (copy_to_user(buf + retval, client->buffer + client->tail, sizeof(struct js_event)))
 288                         return -EFAULT;
 289
 290                 client->tail = (client->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
 291                 retval += sizeof(struct js_event);
 292         }
 293
 294         return retval;
 295 }
 296
 297 /* No kernel lock - fine */
 298 static unsigned int joydev_poll(struct file *file, poll_table *wait)
 299 {
 300         struct joydev_client *client = file->private_data;
 301         struct joydev *joydev = client->joydev;
 302
 303         poll_wait(file, &joydev->wait, wait);
 304         return ((client->head != client->tail || client->startup < joydev->nabs + joydev->nkey) ?
 305                 (POLLIN | POLLRDNORM) : 0) | (joydev->exist ? 0 : (POLLHUP | POLLERR));
 306 }
 307
 308 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
 309 {
 310         struct input_dev *dev = joydev->handle.dev;
 311         int i, j;
 312
 313         switch (cmd) {
 314
 315                 case JS_SET_CAL:
 316                         return copy_from_user(&joydev->glue.JS_CORR, argp,
 317                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 318
 319                 case JS_GET_CAL:
 320                         return copy_to_user(argp, &joydev->glue.JS_CORR,
 321                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 322
 323                 case JS_SET_TIMEOUT:
 324                         return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 325
 326                 case JS_GET_TIMEOUT:
 327                         return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 328
 329                 case JSIOCGVERSION:
 330                         return put_user(JS_VERSION, (__u32 __user *) argp);
 331
 332                 case JSIOCGAXES:
 333                         return put_user(joydev->nabs, (__u8 __user *) argp);
 334
 335                 case JSIOCGBUTTONS:
 336                         return put_user(joydev->nkey, (__u8 __user *) argp);
 337
 338                 case JSIOCSCORR:
 339                         if (copy_from_user(joydev->corr, argp,
 340                                       sizeof(joydev->corr[0]) * joydev->nabs))
 341                             return -EFAULT;
 342                         for (i = 0; i < joydev->nabs; i++) {
 343                                 j = joydev->abspam[i];
 344                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 345                         }
 346                         return 0;
 347
 348                 case JSIOCGCORR:
 349                         return copy_to_user(argp, joydev->corr,
 350                                                 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
 351
 352                 case JSIOCSAXMAP:
 353                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
 354                                 return -EFAULT;
 355                         for (i = 0; i < joydev->nabs; i++) {
 356                                 if (joydev->abspam[i] > ABS_MAX)
 357                                         return -EINVAL;
 358                                 joydev->absmap[joydev->abspam[i]] = i;
 359                         }
 360                         return 0;
 361
 362                 case JSIOCGAXMAP:
 363                         return copy_to_user(argp, joydev->abspam,
 364                                                 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
 365
 366                 case JSIOCSBTNMAP:
 367                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
 368                                 return -EFAULT;
 369                         for (i = 0; i < joydev->nkey; i++) {
 370                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC)
 371                                         return -EINVAL;
 372                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
 373                         }
 374                         return 0;
 375
 376                 case JSIOCGBTNMAP:
 377                         return copy_to_user(argp, joydev->keypam,
 378                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
 379
 380                 default:
 381                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
 382                                 int len;
 383                                 if (!dev->name)
 384                                         return 0;
 385                                 len = strlen(dev->name) + 1;
 386                                 if (len > _IOC_SIZE(cmd))
 387                                         len = _IOC_SIZE(cmd);
 388                                 if (copy_to_user(argp, dev->name, len))
 389                                         return -EFAULT;
 390                                 return len;
 391                         }
 392         }
 393         return -EINVAL;
 394 }
 395
 396 #ifdef CONFIG_COMPAT
 397 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 398 {
 399         struct joydev_client *client = file->private_data;
 400         struct joydev *joydev = client->joydev;
 401         void __user *argp = (void __user *)arg;
 402         s32 tmp32;
 403         struct JS_DATA_SAVE_TYPE_32 ds32;
 404         int err;
 405
 406         if (!joydev->exist)
 407                 return -ENODEV;
 408
 409         switch(cmd) {
 410         case JS_SET_TIMELIMIT:
 411                 err = get_user(tmp32, (s32 __user *) arg);
 412                 if (err == 0)
 413                         joydev->glue.JS_TIMELIMIT = tmp32;
 414                 break;
 415         case JS_GET_TIMELIMIT:
 416                 tmp32 = joydev->glue.JS_TIMELIMIT;
 417                 err = put_user(tmp32, (s32 __user *) arg);
 418                 break;
 419
 420         case JS_SET_ALL:
 421                 err = copy_from_user(&ds32, argp,
 422                                      sizeof(ds32)) ? -EFAULT : 0;
 423                 if (err == 0) {
 424                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
 425                         joydev->glue.BUSY          = ds32.BUSY;
 426                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
 427                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
 428                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
 429                         joydev->glue.JS_CORR       = ds32.JS_CORR;
 430                 }
 431                 break;
 432
 433         case JS_GET_ALL:
 434                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
 435                 ds32.BUSY          = joydev->glue.BUSY;
 436                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
 437                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
 438                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
 439                 ds32.JS_CORR       = joydev->glue.JS_CORR;
 440
 441                 err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
 442                 break;
 443
 444         default:
 445                 err = joydev_ioctl_common(joydev, cmd, argp);
 446         }
 447         return err;
 448 }
 449 #endif /* CONFIG_COMPAT */
 450
 451 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 452 {
 453         struct joydev_client *client = file->private_data;
 454         struct joydev *joydev = client->joydev;
 455         void __user *argp = (void __user *)arg;
 456
 457         if (!joydev->exist)
 458                 return -ENODEV;
 459
 460         switch(cmd) {
 461                 case JS_SET_TIMELIMIT:
 462                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 463                 case JS_GET_TIMELIMIT:
 464                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 465                 case JS_SET_ALL:
 466                         return copy_from_user(&joydev->glue, argp,
 467                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
 468                 case JS_GET_ALL:
 469                         return copy_to_user(argp, &joydev->glue,
 470                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
 471                 default:
 472                         return joydev_ioctl_common(joydev, cmd, argp);
 473         }
 474 }
 475
 476 static const struct file_operations joydev_fops = {
 477         .owner =        THIS_MODULE,
 478         .read =         joydev_read,
 479         .write =        joydev_write,
 480         .poll =         joydev_poll,
 481         .open =         joydev_open,
 482         .release =      joydev_release,
 483         .ioctl =        joydev_ioctl,
 484 #ifdef CONFIG_COMPAT
 485         .compat_ioctl = joydev_compat_ioctl,
 486 #endif
 487         .fasync =       joydev_fasync,
 488 };
 489
 490 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
 491                           const struct input_device_id *id)
 492 {
 493         struct joydev *joydev;
 494         int i, j, t, minor;
 495         int error;
 496
 497         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
 498         if (minor == JOYDEV_MINORS) {
 499                 printk(KERN_ERR "joydev: no more free joydev devices\n");
 500                 return -ENFILE;
 501         }
 502
 503         joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
 504         if (!joydev)
 505                 return -ENOMEM;
 506
 507         INIT_LIST_HEAD(&joydev->client_list);
 508         init_waitqueue_head(&joydev->wait);
 509
 510         joydev->minor = minor;
 511         joydev->exist = 1;
 512         joydev->handle.dev = dev;
 513         joydev->handle.name = joydev->name;
 514         joydev->handle.handler = handler;
 515         joydev->handle.private = joydev;
 516         snprintf(joydev->name, sizeof(joydev->name), "js%d", minor);
 517
 518         for (i = 0; i < ABS_MAX + 1; i++)
 519                 if (test_bit(i, dev->absbit)) {
 520                         joydev->absmap[i] = joydev->nabs;
 521                         joydev->abspam[joydev->nabs] = i;
 522                         joydev->nabs++;
 523                 }
 524
 525         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
 526                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 527                         joydev->keymap[i] = joydev->nkey;
 528                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 529                         joydev->nkey++;
 530                 }
 531
 532         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 533                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 534                         joydev->keymap[i] = joydev->nkey;
 535                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 536                         joydev->nkey++;
 537                 }
 538
 539         for (i = 0; i < joydev->nabs; i++) {
 540                 j = joydev->abspam[i];
 541                 if (dev->absmax[j] == dev->absmin[j]) {
 542                         joydev->corr[i].type = JS_CORR_NONE;
 543                         joydev->abs[i] = dev->abs[j];
 544                         continue;
 545                 }
 546                 joydev->corr[i].type = JS_CORR_BROKEN;
 547                 joydev->corr[i].prec = dev->absfuzz[j];
 548                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 549                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 550                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
 551                         continue;
 552                 joydev->corr[i].coef[2] = (1 << 29) / t;
 553                 joydev->corr[i].coef[3] = (1 << 29) / t;
 554
 555                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 556         }
 557
 558         snprintf(joydev->dev.bus_id, sizeof(joydev->dev.bus_id),
 559                  "js%d", minor);
 560         joydev->dev.class = &input_class;
 561         joydev->dev.parent = &dev->dev;
 562         joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
 563         joydev->dev.release = joydev_free;
 564         device_initialize(&joydev->dev);
 565
 566         joydev_table[minor] = joydev;
 567
 568         error = device_add(&joydev->dev);
 569         if (error)
 570                 goto err_free_joydev;
 571
 572         error = input_register_handle(&joydev->handle);
 573         if (error)
 574                 goto err_delete_joydev;
 575
 576         return 0;
 577
 578  err_delete_joydev:
 579         device_del(&joydev->dev);
 580  err_free_joydev:
 581         put_device(&joydev->dev);
 582         return error;
 583 }
 584
 585
 586 static void joydev_disconnect(struct input_handle *handle)
 587 {
 588         struct joydev *joydev = handle->private;
 589         struct joydev_client *client;
 590
 591         input_unregister_handle(handle);
 592         device_del(&joydev->dev);
 593
 594         joydev->exist = 0;
 595
 596         if (joydev->open) {
 597                 input_close_device(handle);
 598                 list_for_each_entry(client, &joydev->client_list, node)
 599                         kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 600                 wake_up_interruptible(&joydev->wait);
 601         }
 602
 603         put_device(&joydev->dev);
 604 }
 605
 606 static const struct input_device_id joydev_blacklist[] = {
 607         {
 608                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 609                 .evbit = { BIT(EV_KEY) },
 610                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 611         },      /* Avoid itouchpads, touchscreens and tablets */
 612         { }     /* Terminating entry */
 613 };
 614
 615 static const struct input_device_id joydev_ids[] = {
 616         {
 617                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 618                 .evbit = { BIT(EV_ABS) },
 619                 .absbit = { BIT(ABS_X) },
 620         },
 621         {
 622                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 623                 .evbit = { BIT(EV_ABS) },
 624                 .absbit = { BIT(ABS_WHEEL) },
 625         },
 626         {
 627                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 628                 .evbit = { BIT(EV_ABS) },
 629                 .absbit = { BIT(ABS_THROTTLE) },
 630         },
 631         { }     /* Terminating entry */
 632 };
 633
 634 MODULE_DEVICE_TABLE(input, joydev_ids);
 635
 636 static struct input_handler joydev_handler = {
 637         .event =        joydev_event,
 638         .connect =      joydev_connect,
 639         .disconnect =   joydev_disconnect,
 640         .fops =         &joydev_fops,
 641         .minor =        JOYDEV_MINOR_BASE,
 642         .name =         "joydev",
 643         .id_table =     joydev_ids,
 644         .blacklist =    joydev_blacklist,
 645 };
 646
 647 static int __init joydev_init(void)
 648 {
 649         return input_register_handler(&joydev_handler);
 650 }
 651
 652 static void __exit joydev_exit(void)
 653 {
 654         input_unregister_handler(&joydev_handler);
 655 }
 656
 657 module_init(joydev_init);
 658 module_exit(joydev_exit);