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 js_corr corr[ABS_MAX + 1];
  47         struct JS_DATA_SAVE_TYPE glue;
  48         int nabs;
  49         int nkey;
  50         __u16 keymap[KEY_MAX - BTN_MISC + 1];
  51         __u16 keypam[KEY_MAX - BTN_MISC + 1];
  52         __u8 absmap[ABS_MAX + 1];
  53         __u8 abspam[ABS_MAX + 1];
  54         __s16 abs[ABS_MAX + 1];
  55 };
  56
  57 struct joydev_client {
  58         struct js_event buffer[JOYDEV_BUFFER_SIZE];
  59         int head;
  60         int tail;
  61         int startup;
  62         struct fasync_struct *fasync;
  63         struct joydev *joydev;
  64         struct list_head node;
  65 };
  66
  67 static struct joydev *joydev_table[JOYDEV_MINORS];
  68
  69 static int joydev_correct(int value, struct js_corr *corr)
  70 {
  71         switch (corr->type) {
  72                 case JS_CORR_NONE:
  73                         break;
  74                 case JS_CORR_BROKEN:
  75                         value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
  76                                 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
  77                                 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
  78                         break;
  79                 default:
  80                         return 0;
  81         }
  82
  83         return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
  84 }
  85
  86 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  87 {
  88         struct joydev *joydev = handle->private;
  89         struct joydev_client *client;
  90         struct js_event event;
  91
  92         switch (type) {
  93
  94                 case EV_KEY:
  95                         if (code < BTN_MISC || value == 2)
  96                                 return;
  97                         event.type = JS_EVENT_BUTTON;
  98                         event.number = joydev->keymap[code - BTN_MISC];
  99                         event.value = value;
 100                         break;
 101
 102                 case EV_ABS:
 103                         event.type = JS_EVENT_AXIS;
 104                         event.number = joydev->absmap[code];
 105                         event.value = joydev_correct(value, joydev->corr + event.number);
 106                         if (event.value == joydev->abs[event.number])
 107                                 return;
 108                         joydev->abs[event.number] = event.value;
 109                         break;
 110
 111                 default:
 112                         return;
 113         }
 114
 115         event.time = jiffies_to_msecs(jiffies);
 116
 117         list_for_each_entry(client, &joydev->client_list, node) {
 118
 119                 memcpy(client->buffer + client->head, &event, sizeof(struct js_event));
 120
 121                 if (client->startup == joydev->nabs + joydev->nkey)
 122                         if (client->tail == (client->head = (client->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
 123                                 client->startup = 0;
 124
 125                 kill_fasync(&client->fasync, SIGIO, POLL_IN);
 126         }
 127
 128         wake_up_interruptible(&joydev->wait);
 129 }
 130
 131 static int joydev_fasync(int fd, struct file *file, int on)
 132 {
 133         int retval;
 134         struct joydev_client *client = file->private_data;
 135
 136         retval = fasync_helper(fd, file, on, &client->fasync);
 137
 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_client *client = file->private_data;
 150         struct joydev *joydev = client->joydev;
 151
 152         joydev_fasync(-1, file, 0);
 153
 154         list_del(&client->node);
 155         kfree(client);
 156
 157         if (!--joydev->open) {
 158                 if (joydev->exist)
 159                         input_close_device(&joydev->handle);
 160                 else
 161                         joydev_free(joydev);
 162         }
 163
 164         return 0;
 165 }
 166
 167 static int joydev_open(struct inode *inode, struct file *file)
 168 {
 169         struct joydev_client *client;
 170         struct joydev *joydev;
 171         int i = iminor(inode) - JOYDEV_MINOR_BASE;
 172         int error;
 173
 174         if (i >= JOYDEV_MINORS)
 175                 return -ENODEV;
 176
 177         joydev = joydev_table[i];
 178         if (!joydev || !joydev->exist)
 179                 return -ENODEV;
 180
 181         client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
 182         if (!client)
 183                 return -ENOMEM;
 184
 185         client->joydev = joydev;
 186         list_add_tail(&client->node, &joydev->client_list);
 187
 188         if (!joydev->open++ && joydev->exist) {
 189                 error = input_open_device(&joydev->handle);
 190                 if (error) {
 191                         list_del(&client->node);
 192                         kfree(client);
 193                         return error;
 194                 }
 195         }
 196
 197         file->private_data = client;
 198         return 0;
 199 }
 200
 201 static ssize_t joydev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 202 {
 203         return -EINVAL;
 204 }
 205
 206 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 207 {
 208         struct joydev_client *client = file->private_data;
 209         struct joydev *joydev = client->joydev;
 210         struct input_dev *input = joydev->handle.dev;
 211         int retval = 0;
 212
 213         if (!joydev->exist)
 214                 return -ENODEV;
 215
 216         if (count < sizeof(struct js_event))
 217                 return -EINVAL;
 218
 219         if (count == sizeof(struct JS_DATA_TYPE)) {
 220
 221                 struct JS_DATA_TYPE data;
 222                 int i;
 223
 224                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
 225                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
 226                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
 227                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
 228
 229                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 230                         return -EFAULT;
 231
 232                 client->startup = 0;
 233                 client->tail = client->head;
 234
 235                 return sizeof(struct JS_DATA_TYPE);
 236         }
 237
 238         if (client->startup == joydev->nabs + joydev->nkey &&
 239             client->head == client->tail && (file->f_flags & O_NONBLOCK))
 240                 return -EAGAIN;
 241
 242         retval = wait_event_interruptible(joydev->wait,
 243                                           !joydev->exist ||
 244                                           client->startup < joydev->nabs + joydev->nkey ||
 245                                           client->head != client->tail);
 246         if (retval)
 247                 return retval;
 248
 249         if (!joydev->exist)
 250                 return -ENODEV;
 251
 252         while (client->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
 253
 254                 struct js_event event;
 255
 256                 event.time = jiffies_to_msecs(jiffies);
 257
 258                 if (client->startup < joydev->nkey) {
 259                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
 260                         event.number = client->startup;
 261                         event.value = !!test_bit(joydev->keypam[event.number], input->key);
 262                 } else {
 263                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
 264                         event.number = client->startup - joydev->nkey;
 265                         event.value = joydev->abs[event.number];
 266                 }
 267
 268                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 269                         return -EFAULT;
 270
 271                 client->startup++;
 272                 retval += sizeof(struct js_event);
 273         }
 274
 275         while (client->head != client->tail && retval + sizeof(struct js_event) <= count) {
 276
 277                 if (copy_to_user(buf + retval, client->buffer + client->tail, sizeof(struct js_event)))
 278                         return -EFAULT;
 279
 280                 client->tail = (client->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
 281                 retval += sizeof(struct js_event);
 282         }
 283
 284         return retval;
 285 }
 286
 287 /* No kernel lock - fine */
 288 static unsigned int joydev_poll(struct file *file, poll_table *wait)
 289 {
 290         struct joydev_client *client = file->private_data;
 291         struct joydev *joydev = client->joydev;
 292
 293         poll_wait(file, &joydev->wait, wait);
 294         return ((client->head != client->tail || client->startup < joydev->nabs + joydev->nkey) ?
 295                 (POLLIN | POLLRDNORM) : 0) | (joydev->exist ? 0 : (POLLHUP | POLLERR));
 296 }
 297
 298 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
 299 {
 300         struct input_dev *dev = joydev->handle.dev;
 301         int i, j;
 302
 303         switch (cmd) {
 304
 305                 case JS_SET_CAL:
 306                         return copy_from_user(&joydev->glue.JS_CORR, argp,
 307                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 308
 309                 case JS_GET_CAL:
 310                         return copy_to_user(argp, &joydev->glue.JS_CORR,
 311                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 312
 313                 case JS_SET_TIMEOUT:
 314                         return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 315
 316                 case JS_GET_TIMEOUT:
 317                         return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 318
 319                 case JSIOCGVERSION:
 320                         return put_user(JS_VERSION, (__u32 __user *) argp);
 321
 322                 case JSIOCGAXES:
 323                         return put_user(joydev->nabs, (__u8 __user *) argp);
 324
 325                 case JSIOCGBUTTONS:
 326                         return put_user(joydev->nkey, (__u8 __user *) argp);
 327
 328                 case JSIOCSCORR:
 329                         if (copy_from_user(joydev->corr, argp,
 330                                       sizeof(joydev->corr[0]) * joydev->nabs))
 331                             return -EFAULT;
 332                         for (i = 0; i < joydev->nabs; i++) {
 333                                 j = joydev->abspam[i];
 334                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 335                         }
 336                         return 0;
 337
 338                 case JSIOCGCORR:
 339                         return copy_to_user(argp, joydev->corr,
 340                                                 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
 341
 342                 case JSIOCSAXMAP:
 343                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
 344                                 return -EFAULT;
 345                         for (i = 0; i < joydev->nabs; i++) {
 346                                 if (joydev->abspam[i] > ABS_MAX)
 347                                         return -EINVAL;
 348                                 joydev->absmap[joydev->abspam[i]] = i;
 349                         }
 350                         return 0;
 351
 352                 case JSIOCGAXMAP:
 353                         return copy_to_user(argp, joydev->abspam,
 354                                                 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
 355
 356                 case JSIOCSBTNMAP:
 357                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
 358                                 return -EFAULT;
 359                         for (i = 0; i < joydev->nkey; i++) {
 360                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC)
 361                                         return -EINVAL;
 362                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
 363                         }
 364                         return 0;
 365
 366                 case JSIOCGBTNMAP:
 367                         return copy_to_user(argp, joydev->keypam,
 368                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
 369
 370                 default:
 371                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
 372                                 int len;
 373                                 if (!dev->name)
 374                                         return 0;
 375                                 len = strlen(dev->name) + 1;
 376                                 if (len > _IOC_SIZE(cmd))
 377                                         len = _IOC_SIZE(cmd);
 378                                 if (copy_to_user(argp, dev->name, len))
 379                                         return -EFAULT;
 380                                 return len;
 381                         }
 382         }
 383         return -EINVAL;
 384 }
 385
 386 #ifdef CONFIG_COMPAT
 387 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 388 {
 389         struct joydev_client *client = file->private_data;
 390         struct joydev *joydev = client->joydev;
 391         void __user *argp = (void __user *)arg;
 392         s32 tmp32;
 393         struct JS_DATA_SAVE_TYPE_32 ds32;
 394         int err;
 395
 396         if (!joydev->exist)
 397                 return -ENODEV;
 398
 399         switch(cmd) {
 400         case JS_SET_TIMELIMIT:
 401                 err = get_user(tmp32, (s32 __user *) arg);
 402                 if (err == 0)
 403                         joydev->glue.JS_TIMELIMIT = tmp32;
 404                 break;
 405         case JS_GET_TIMELIMIT:
 406                 tmp32 = joydev->glue.JS_TIMELIMIT;
 407                 err = put_user(tmp32, (s32 __user *) arg);
 408                 break;
 409
 410         case JS_SET_ALL:
 411                 err = copy_from_user(&ds32, argp,
 412                                      sizeof(ds32)) ? -EFAULT : 0;
 413                 if (err == 0) {
 414                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
 415                         joydev->glue.BUSY          = ds32.BUSY;
 416                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
 417                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
 418                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
 419                         joydev->glue.JS_CORR       = ds32.JS_CORR;
 420                 }
 421                 break;
 422
 423         case JS_GET_ALL:
 424                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
 425                 ds32.BUSY          = joydev->glue.BUSY;
 426                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
 427                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
 428                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
 429                 ds32.JS_CORR       = joydev->glue.JS_CORR;
 430
 431                 err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
 432                 break;
 433
 434         default:
 435                 err = joydev_ioctl_common(joydev, cmd, argp);
 436         }
 437         return err;
 438 }
 439 #endif /* CONFIG_COMPAT */
 440
 441 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 442 {
 443         struct joydev_client *client = file->private_data;
 444         struct joydev *joydev = client->joydev;
 445         void __user *argp = (void __user *)arg;
 446
 447         if (!joydev->exist)
 448                 return -ENODEV;
 449
 450         switch(cmd) {
 451                 case JS_SET_TIMELIMIT:
 452                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 453                 case JS_GET_TIMELIMIT:
 454                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 455                 case JS_SET_ALL:
 456                         return copy_from_user(&joydev->glue, argp,
 457                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
 458                 case JS_GET_ALL:
 459                         return copy_to_user(argp, &joydev->glue,
 460                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
 461                 default:
 462                         return joydev_ioctl_common(joydev, cmd, argp);
 463         }
 464 }
 465
 466 static const struct file_operations joydev_fops = {
 467         .owner =        THIS_MODULE,
 468         .read =         joydev_read,
 469         .write =        joydev_write,
 470         .poll =         joydev_poll,
 471         .open =         joydev_open,
 472         .release =      joydev_release,
 473         .ioctl =        joydev_ioctl,
 474 #ifdef CONFIG_COMPAT
 475         .compat_ioctl = joydev_compat_ioctl,
 476 #endif
 477         .fasync =       joydev_fasync,
 478 };
 479
 480 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
 481                           const struct input_device_id *id)
 482 {
 483         struct joydev *joydev;
 484         struct class_device *cdev;
 485         dev_t devt;
 486         int i, j, t, minor;
 487         int error;
 488
 489         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
 490         if (minor == JOYDEV_MINORS) {
 491                 printk(KERN_ERR "joydev: no more free joydev devices\n");
 492                 return -ENFILE;
 493         }
 494
 495         joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
 496         if (!joydev)
 497                 return -ENOMEM;
 498
 499         INIT_LIST_HEAD(&joydev->client_list);
 500         init_waitqueue_head(&joydev->wait);
 501
 502         joydev->minor = minor;
 503         joydev->exist = 1;
 504         joydev->handle.dev = dev;
 505         joydev->handle.name = joydev->name;
 506         joydev->handle.handler = handler;
 507         joydev->handle.private = joydev;
 508         sprintf(joydev->name, "js%d", minor);
 509
 510         for (i = 0; i < ABS_MAX + 1; i++)
 511                 if (test_bit(i, dev->absbit)) {
 512                         joydev->absmap[i] = joydev->nabs;
 513                         joydev->abspam[joydev->nabs] = i;
 514                         joydev->nabs++;
 515                 }
 516
 517         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
 518                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 519                         joydev->keymap[i] = joydev->nkey;
 520                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 521                         joydev->nkey++;
 522                 }
 523
 524         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 525                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 526                         joydev->keymap[i] = joydev->nkey;
 527                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 528                         joydev->nkey++;
 529                 }
 530
 531         for (i = 0; i < joydev->nabs; i++) {
 532                 j = joydev->abspam[i];
 533                 if (dev->absmax[j] == dev->absmin[j]) {
 534                         joydev->corr[i].type = JS_CORR_NONE;
 535                         joydev->abs[i] = dev->abs[j];
 536                         continue;
 537                 }
 538                 joydev->corr[i].type = JS_CORR_BROKEN;
 539                 joydev->corr[i].prec = dev->absfuzz[j];
 540                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 541                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 542                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
 543                         continue;
 544                 joydev->corr[i].coef[2] = (1 << 29) / t;
 545                 joydev->corr[i].coef[3] = (1 << 29) / t;
 546
 547                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 548         }
 549
 550         joydev_table[minor] = joydev;
 551
 552         devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
 553
 554         cdev = class_device_create(&input_class, &dev->cdev, devt,
 555                                    dev->cdev.dev, joydev->name);
 556         if (IS_ERR(cdev)) {
 557                 error = PTR_ERR(cdev);
 558                 goto err_free_joydev;
 559         }
 560
 561         /* temporary symlink to keep userspace happy */
 562         error = sysfs_create_link(&input_class.subsys.kobj,
 563                                   &cdev->kobj, joydev->name);
 564         if (error)
 565                 goto err_cdev_destroy;
 566
 567         error = input_register_handle(&joydev->handle);
 568         if (error)
 569                 goto err_remove_link;
 570
 571         return 0;
 572
 573  err_remove_link:
 574         sysfs_remove_link(&input_class.subsys.kobj, joydev->name);
 575  err_cdev_destroy:
 576         class_device_destroy(&input_class, devt);
 577  err_free_joydev:
 578         joydev_table[minor] = NULL;
 579         kfree(joydev);
 580         return error;
 581 }
 582
 583
 584 static void joydev_disconnect(struct input_handle *handle)
 585 {
 586         struct joydev *joydev = handle->private;
 587         struct joydev_client *client;
 588
 589         input_unregister_handle(handle);
 590
 591         sysfs_remove_link(&input_class.subsys.kobj, joydev->name);
 592         class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
 593         joydev->exist = 0;
 594
 595         if (joydev->open) {
 596                 input_close_device(handle);
 597                 list_for_each_entry(client, &joydev->client_list, node)
 598                         kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 599                 wake_up_interruptible(&joydev->wait);
 600         } else
 601                 joydev_free(joydev);
 602 }
 603
 604 static const struct input_device_id joydev_blacklist[] = {
 605         {
 606                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 607                 .evbit = { BIT(EV_KEY) },
 608                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 609         },      /* Avoid itouchpads, touchscreens and tablets */
 610         { }     /* Terminating entry */
 611 };
 612
 613 static const struct input_device_id joydev_ids[] = {
 614         {
 615                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 616                 .evbit = { BIT(EV_ABS) },
 617                 .absbit = { BIT(ABS_X) },
 618         },
 619         {
 620                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 621                 .evbit = { BIT(EV_ABS) },
 622                 .absbit = { BIT(ABS_WHEEL) },
 623         },
 624         {
 625                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 626                 .evbit = { BIT(EV_ABS) },
 627                 .absbit = { BIT(ABS_THROTTLE) },
 628         },
 629         { }     /* Terminating entry */
 630 };
 631
 632 MODULE_DEVICE_TABLE(input, joydev_ids);
 633
 634 static struct input_handler joydev_handler = {
 635         .event =        joydev_event,
 636         .connect =      joydev_connect,
 637         .disconnect =   joydev_disconnect,
 638         .fops =         &joydev_fops,
 639         .minor =        JOYDEV_MINOR_BASE,
 640         .name =         "joydev",
 641         .id_table =     joydev_ids,
 642         .blacklist =    joydev_blacklist,
 643 };
 644
 645 static int __init joydev_init(void)
 646 {
 647         return input_register_handler(&joydev_handler);
 648 }
 649
 650 static void __exit joydev_exit(void)
 651 {
 652         input_unregister_handler(&joydev_handler);
 653 }
 654
 655 module_init(joydev_init);
 656 module_exit(joydev_exit);