git.oblomov.eu Git - linux-2.6/blob - 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 client_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_client {
  59         struct js_event buffer[JOYDEV_BUFFER_SIZE];
  60         int head;
  61         int tail;
  62         int startup;
  63         struct fasync_struct *fasync;
  64         struct joydev *joydev;
  65         struct list_head node;
  66 };
  67
  68 static struct joydev *joydev_table[JOYDEV_MINORS];
  69
  70 static int joydev_correct(int value, struct js_corr *corr)
  71 {
  72         switch (corr->type) {
  73                 case JS_CORR_NONE:
  74                         break;
  75                 case JS_CORR_BROKEN:
  76                         value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
  77                                 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
  78                                 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
  79                         break;
  80                 default:
  81                         return 0;
  82         }
  83
  84         return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
  85 }
  86
  87 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  88 {
  89         struct joydev *joydev = handle->private;
  90         struct joydev_client *client;
  91         struct js_event event;
  92
  93         switch (type) {
  94
  95                 case EV_KEY:
  96                         if (code < BTN_MISC || value == 2)
  97                                 return;
  98                         event.type = JS_EVENT_BUTTON;
  99                         event.number = joydev->keymap[code - BTN_MISC];
 100                         event.value = value;
 101                         break;
 102
 103                 case EV_ABS:
 104                         event.type = JS_EVENT_AXIS;
 105                         event.number = joydev->absmap[code];
 106                         event.value = joydev_correct(value, joydev->corr + event.number);
 107                         if (event.value == joydev->abs[event.number])
 108                                 return;
 109                         joydev->abs[event.number] = event.value;
 110                         break;
 111
 112                 default:
 113                         return;
 114         }
 115
 116         event.time = jiffies_to_msecs(jiffies);
 117
 118         list_for_each_entry(client, &joydev->client_list, node) {
 119
 120                 memcpy(client->buffer + client->head, &event, sizeof(struct js_event));
 121
 122                 if (client->startup == joydev->nabs + joydev->nkey)
 123                         if (client->tail == (client->head = (client->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
 124                                 client->startup = 0;
 125
 126                 kill_fasync(&client->fasync, SIGIO, POLL_IN);
 127         }
 128
 129         wake_up_interruptible(&joydev->wait);
 130 }
 131
 132 static int joydev_fasync(int fd, struct file *file, int on)
 133 {
 134         int retval;
 135         struct joydev_client *client = file->private_data;
 136
 137         retval = fasync_helper(fd, file, on, &client->fasync);
 138
 139         return retval < 0 ? retval : 0;
 140 }
 141
 142 static void joydev_free(struct joydev *joydev)
 143 {
 144         joydev_table[joydev->minor] = NULL;
 145         kfree(joydev);
 146 }
 147
 148 static int joydev_release(struct inode *inode, struct file *file)
 149 {
 150         struct joydev_client *client = file->private_data;
 151         struct joydev *joydev = client->joydev;
 152
 153         joydev_fasync(-1, file, 0);
 154
 155         list_del(&client->node);
 156         kfree(client);
 157
 158         if (!--joydev->open) {
 159                 if (joydev->exist)
 160                         input_close_device(&joydev->handle);
 161                 else
 162                         joydev_free(joydev);
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int joydev_open(struct inode *inode, struct file *file)
 169 {
 170         struct joydev_client *client;
 171         struct joydev *joydev;
 172         int i = iminor(inode) - JOYDEV_MINOR_BASE;
 173         int error;
 174
 175         if (i >= JOYDEV_MINORS)
 176                 return -ENODEV;
 177
 178         joydev = joydev_table[i];
 179         if (!joydev || !joydev->exist)
 180                 return -ENODEV;
 181
 182         client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
 183         if (!client)
 184                 return -ENOMEM;
 185
 186         client->joydev = joydev;
 187         list_add_tail(&client->node, &joydev->client_list);
 188
 189         if (!joydev->open++ && joydev->exist) {
 190                 error = input_open_device(&joydev->handle);
 191                 if (error) {
 192                         list_del(&client->node);
 193                         kfree(client);
 194                         return error;
 195                 }
 196         }
 197
 198         file->private_data = client;
 199         return 0;
 200 }
 201
 202 static ssize_t joydev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 203 {
 204         return -EINVAL;
 205 }
 206
 207 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 208 {
 209         struct joydev_client *client = file->private_data;
 210         struct joydev *joydev = client->joydev;
 211         struct input_dev *input = joydev->handle.dev;
 212         int retval = 0;
 213
 214         if (!joydev->exist)
 215                 return -ENODEV;
 216
 217         if (count < sizeof(struct js_event))
 218                 return -EINVAL;
 219
 220         if (count == sizeof(struct JS_DATA_TYPE)) {
 221
 222                 struct JS_DATA_TYPE data;
 223                 int i;
 224
 225                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
 226                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
 227                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
 228                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
 229
 230                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 231                         return -EFAULT;
 232
 233                 client->startup = 0;
 234                 client->tail = client->head;
 235
 236                 return sizeof(struct JS_DATA_TYPE);
 237         }
 238
 239         if (client->startup == joydev->nabs + joydev->nkey &&
 240             client->head == client->tail && (file->f_flags & O_NONBLOCK))
 241                 return -EAGAIN;
 242
 243         retval = wait_event_interruptible(joydev->wait,
 244                                           !joydev->exist ||
 245                                           client->startup < joydev->nabs + joydev->nkey ||
 246                                           client->head != client->tail);
 247         if (retval)
 248                 return retval;
 249
 250         if (!joydev->exist)
 251                 return -ENODEV;
 252
 253         while (client->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
 254
 255                 struct js_event event;
 256
 257                 event.time = jiffies_to_msecs(jiffies);
 258
 259                 if (client->startup < joydev->nkey) {
 260                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
 261                         event.number = client->startup;
 262                         event.value = !!test_bit(joydev->keypam[event.number], input->key);
 263                 } else {
 264                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
 265                         event.number = client->startup - joydev->nkey;
 266                         event.value = joydev->abs[event.number];
 267                 }
 268
 269                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 270                         return -EFAULT;
 271
 272                 client->startup++;
 273                 retval += sizeof(struct js_event);
 274         }
 275
 276         while (client->head != client->tail && retval + sizeof(struct js_event) <= count) {
 277
 278                 if (copy_to_user(buf + retval, client->buffer + client->tail, sizeof(struct js_event)))
 279                         return -EFAULT;
 280
 281                 client->tail = (client->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
 282                 retval += sizeof(struct js_event);
 283         }
 284
 285         return retval;
 286 }
 287
 288 /* No kernel lock - fine */
 289 static unsigned int joydev_poll(struct file *file, poll_table *wait)
 290 {
 291         struct joydev_client *client = file->private_data;
 292         struct joydev *joydev = client->joydev;
 293
 294         poll_wait(file, &joydev->wait, wait);
 295         return ((client->head != client->tail || client->startup < joydev->nabs + joydev->nkey) ?
 296                 (POLLIN | POLLRDNORM) : 0) | (joydev->exist ? 0 : (POLLHUP | POLLERR));
 297 }
 298
 299 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
 300 {
 301         struct input_dev *dev = joydev->handle.dev;
 302         int i, j;
 303
 304         switch (cmd) {
 305
 306                 case JS_SET_CAL:
 307                         return copy_from_user(&joydev->glue.JS_CORR, argp,
 308                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 309
 310                 case JS_GET_CAL:
 311                         return copy_to_user(argp, &joydev->glue.JS_CORR,
 312                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 313
 314                 case JS_SET_TIMEOUT:
 315                         return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 316
 317                 case JS_GET_TIMEOUT:
 318                         return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 319
 320                 case JSIOCGVERSION:
 321                         return put_user(JS_VERSION, (__u32 __user *) argp);
 322
 323                 case JSIOCGAXES:
 324                         return put_user(joydev->nabs, (__u8 __user *) argp);
 325
 326                 case JSIOCGBUTTONS:
 327                         return put_user(joydev->nkey, (__u8 __user *) argp);
 328
 329                 case JSIOCSCORR:
 330                         if (copy_from_user(joydev->corr, argp,
 331                                       sizeof(joydev->corr[0]) * joydev->nabs))
 332                             return -EFAULT;
 333                         for (i = 0; i < joydev->nabs; i++) {
 334                                 j = joydev->abspam[i];
 335                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 336                         }
 337                         return 0;
 338
 339                 case JSIOCGCORR:
 340                         return copy_to_user(argp, joydev->corr,
 341                                                 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
 342
 343                 case JSIOCSAXMAP:
 344                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
 345                                 return -EFAULT;
 346                         for (i = 0; i < joydev->nabs; i++) {
 347                                 if (joydev->abspam[i] > ABS_MAX)
 348                                         return -EINVAL;
 349                                 joydev->absmap[joydev->abspam[i]] = i;
 350                         }
 351                         return 0;
 352
 353                 case JSIOCGAXMAP:
 354                         return copy_to_user(argp, joydev->abspam,
 355                                                 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
 356
 357                 case JSIOCSBTNMAP:
 358                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
 359                                 return -EFAULT;
 360                         for (i = 0; i < joydev->nkey; i++) {
 361                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC)
 362                                         return -EINVAL;
 363                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
 364                         }
 365                         return 0;
 366
 367                 case JSIOCGBTNMAP:
 368                         return copy_to_user(argp, joydev->keypam,
 369                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
 370
 371                 default:
 372                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
 373                                 int len;
 374                                 if (!dev->name)
 375                                         return 0;
 376                                 len = strlen(dev->name) + 1;
 377                                 if (len > _IOC_SIZE(cmd))
 378                                         len = _IOC_SIZE(cmd);
 379                                 if (copy_to_user(argp, dev->name, len))
 380                                         return -EFAULT;
 381                                 return len;
 382                         }
 383         }
 384         return -EINVAL;
 385 }
 386
 387 #ifdef CONFIG_COMPAT
 388 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 389 {
 390         struct joydev_client *client = file->private_data;
 391         struct joydev *joydev = client->joydev;
 392         void __user *argp = (void __user *)arg;
 393         s32 tmp32;
 394         struct JS_DATA_SAVE_TYPE_32 ds32;
 395         int err;
 396
 397         if (!joydev->exist)
 398                 return -ENODEV;
 399
 400         switch(cmd) {
 401         case JS_SET_TIMELIMIT:
 402                 err = get_user(tmp32, (s32 __user *) arg);
 403                 if (err == 0)
 404                         joydev->glue.JS_TIMELIMIT = tmp32;
 405                 break;
 406         case JS_GET_TIMELIMIT:
 407                 tmp32 = joydev->glue.JS_TIMELIMIT;
 408                 err = put_user(tmp32, (s32 __user *) arg);
 409                 break;
 410
 411         case JS_SET_ALL:
 412                 err = copy_from_user(&ds32, argp,
 413                                      sizeof(ds32)) ? -EFAULT : 0;
 414                 if (err == 0) {
 415                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
 416                         joydev->glue.BUSY          = ds32.BUSY;
 417                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
 418                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
 419                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
 420                         joydev->glue.JS_CORR       = ds32.JS_CORR;
 421                 }
 422                 break;
 423
 424         case JS_GET_ALL:
 425                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
 426                 ds32.BUSY          = joydev->glue.BUSY;
 427                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
 428                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
 429                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
 430                 ds32.JS_CORR       = joydev->glue.JS_CORR;
 431
 432                 err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
 433                 break;
 434
 435         default:
 436                 err = joydev_ioctl_common(joydev, cmd, argp);
 437         }
 438         return err;
 439 }
 440 #endif /* CONFIG_COMPAT */
 441
 442 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 443 {
 444         struct joydev_client *client = file->private_data;
 445         struct joydev *joydev = client->joydev;
 446         void __user *argp = (void __user *)arg;
 447
 448         if (!joydev->exist)
 449                 return -ENODEV;
 450
 451         switch(cmd) {
 452                 case JS_SET_TIMELIMIT:
 453                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 454                 case JS_GET_TIMELIMIT:
 455                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 456                 case JS_SET_ALL:
 457                         return copy_from_user(&joydev->glue, argp,
 458                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
 459                 case JS_GET_ALL:
 460                         return copy_to_user(argp, &joydev->glue,
 461                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
 462                 default:
 463                         return joydev_ioctl_common(joydev, cmd, argp);
 464         }
 465 }
 466
 467 static const struct file_operations joydev_fops = {
 468         .owner =        THIS_MODULE,
 469         .read =         joydev_read,
 470         .write =        joydev_write,
 471         .poll =         joydev_poll,
 472         .open =         joydev_open,
 473         .release =      joydev_release,
 474         .ioctl =        joydev_ioctl,
 475 #ifdef CONFIG_COMPAT
 476         .compat_ioctl = joydev_compat_ioctl,
 477 #endif
 478         .fasync =       joydev_fasync,
 479 };
 480
 481 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
 482                           const struct input_device_id *id)
 483 {
 484         struct joydev *joydev;
 485         struct class_device *cdev;
 486         dev_t devt;
 487         int i, j, t, minor;
 488         int error;
 489
 490         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
 491         if (minor == JOYDEV_MINORS) {
 492                 printk(KERN_ERR "joydev: no more free joydev devices\n");
 493                 return -ENFILE;
 494         }
 495
 496         joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
 497         if (!joydev)
 498                 return -ENOMEM;
 499
 500         INIT_LIST_HEAD(&joydev->client_list);
 501         init_waitqueue_head(&joydev->wait);
 502
 503         joydev->minor = minor;
 504         joydev->exist = 1;
 505         joydev->handle.dev = dev;
 506         joydev->handle.name = joydev->name;
 507         joydev->handle.handler = handler;
 508         joydev->handle.private = joydev;
 509         sprintf(joydev->name, "js%d", minor);
 510
 511         for (i = 0; i < ABS_MAX + 1; i++)
 512                 if (test_bit(i, dev->absbit)) {
 513                         joydev->absmap[i] = joydev->nabs;
 514                         joydev->abspam[joydev->nabs] = i;
 515                         joydev->nabs++;
 516                 }
 517
 518         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
 519                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 520                         joydev->keymap[i] = joydev->nkey;
 521                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 522                         joydev->nkey++;
 523                 }
 524
 525         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; 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 < joydev->nabs; i++) {
 533                 j = joydev->abspam[i];
 534                 if (dev->absmax[j] == dev->absmin[j]) {
 535                         joydev->corr[i].type = JS_CORR_NONE;
 536                         joydev->abs[i] = dev->abs[j];
 537                         continue;
 538                 }
 539                 joydev->corr[i].type = JS_CORR_BROKEN;
 540                 joydev->corr[i].prec = dev->absfuzz[j];
 541                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 542                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 543                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
 544                         continue;
 545                 joydev->corr[i].coef[2] = (1 << 29) / t;
 546                 joydev->corr[i].coef[3] = (1 << 29) / t;
 547
 548                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 549         }
 550
 551         joydev_table[minor] = joydev;
 552
 553         devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
 554
 555         cdev = class_device_create(&input_class, &dev->cdev, devt,
 556                                    dev->cdev.dev, joydev->name);
 557         if (IS_ERR(cdev)) {
 558                 error = PTR_ERR(cdev);
 559                 goto err_free_joydev;
 560         }
 561
 562         /* temporary symlink to keep userspace happy */
 563         error = sysfs_create_link(&input_class.subsys.kobj,
 564                                   &cdev->kobj, joydev->name);
 565         if (error)
 566                 goto err_cdev_destroy;
 567
 568         error = input_register_handle(&joydev->handle);
 569         if (error)
 570                 goto err_remove_link;
 571
 572         return 0;
 573
 574  err_remove_link:
 575         sysfs_remove_link(&input_class.subsys.kobj, joydev->name);
 576  err_cdev_destroy:
 577         class_device_destroy(&input_class, devt);
 578  err_free_joydev:
 579         joydev_table[minor] = NULL;
 580         kfree(joydev);
 581         return error;
 582 }
 583
 584
 585 static void joydev_disconnect(struct input_handle *handle)
 586 {
 587         struct joydev *joydev = handle->private;
 588         struct joydev_client *client;
 589
 590         input_unregister_handle(handle);
 591
 592         sysfs_remove_link(&input_class.subsys.kobj, joydev->name);
 593         class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
 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         } else
 602                 joydev_free(joydev);
 603 }
 604
 605 static const struct input_device_id joydev_blacklist[] = {
 606         {
 607                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 608                 .evbit = { BIT(EV_KEY) },
 609                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 610         },      /* Avoid itouchpads, touchscreens and tablets */
 611         { }     /* Terminating entry */
 612 };
 613
 614 static const struct input_device_id joydev_ids[] = {
 615         {
 616                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 617                 .evbit = { BIT(EV_ABS) },
 618                 .absbit = { BIT(ABS_X) },
 619         },
 620         {
 621                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 622                 .evbit = { BIT(EV_ABS) },
 623                 .absbit = { BIT(ABS_WHEEL) },
 624         },
 625         {
 626                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 627                 .evbit = { BIT(EV_ABS) },
 628                 .absbit = { BIT(ABS_THROTTLE) },
 629         },
 630         { }     /* Terminating entry */
 631 };
 632
 633 MODULE_DEVICE_TABLE(input, joydev_ids);
 634
 635 static struct input_handler joydev_handler = {
 636         .event =        joydev_event,
 637         .connect =      joydev_connect,
 638         .disconnect =   joydev_disconnect,
 639         .fops =         &joydev_fops,
 640         .minor =        JOYDEV_MINOR_BASE,
 641         .name =         "joydev",
 642         .id_table =     joydev_ids,
 643         .blacklist =    joydev_blacklist,
 644 };
 645
 646 static int __init joydev_init(void)
 647 {
 648         return input_register_handler(&joydev_handler);
 649 }
 650
 651 static void __exit joydev_exit(void)
 652 {
 653         input_unregister_handler(&joydev_handler);
 654 }
 655
 656 module_init(joydev_init);
 657 module_exit(joydev_exit);