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/sched.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/miscdevice.h>
  25 #include <linux/module.h>
  26 #include <linux/poll.h>
  27 #include <linux/init.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         struct input_handle handle;
  44         wait_queue_head_t wait;
  45         struct list_head client_list;
  46         spinlock_t client_lock; /* protects client_list */
  47         struct mutex mutex;
  48         struct device dev;
  49
  50         struct js_corr corr[ABS_MAX + 1];
  51         struct JS_DATA_SAVE_TYPE glue;
  52         int nabs;
  53         int nkey;
  54         __u16 keymap[KEY_MAX - BTN_MISC + 1];
  55         __u16 keypam[KEY_MAX - BTN_MISC + 1];
  56         __u8 absmap[ABS_MAX + 1];
  57         __u8 abspam[ABS_MAX + 1];
  58         __s16 abs[ABS_MAX + 1];
  59 };
  60
  61 struct joydev_client {
  62         struct js_event buffer[JOYDEV_BUFFER_SIZE];
  63         int head;
  64         int tail;
  65         int startup;
  66         spinlock_t buffer_lock; /* protects access to buffer, head and tail */
  67         struct fasync_struct *fasync;
  68         struct joydev *joydev;
  69         struct list_head node;
  70 };
  71
  72 static struct joydev *joydev_table[JOYDEV_MINORS];
  73 static DEFINE_MUTEX(joydev_table_mutex);
  74
  75 static int joydev_correct(int value, struct js_corr *corr)
  76 {
  77         switch (corr->type) {
  78
  79         case JS_CORR_NONE:
  80                 break;
  81
  82         case JS_CORR_BROKEN:
  83                 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
  84                         ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
  85                         ((corr->coef[2] * (value - corr->coef[0])) >> 14);
  86                 break;
  87
  88         default:
  89                 return 0;
  90         }
  91
  92         return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
  93 }
  94
  95 static void joydev_pass_event(struct joydev_client *client,
  96                               struct js_event *event)
  97 {
  98         struct joydev *joydev = client->joydev;
  99
 100         /*
 101          * IRQs already disabled, just acquire the lock
 102          */
 103         spin_lock(&client->buffer_lock);
 104
 105         client->buffer[client->head] = *event;
 106
 107         if (client->startup == joydev->nabs + joydev->nkey) {
 108                 client->head++;
 109                 client->head &= JOYDEV_BUFFER_SIZE - 1;
 110                 if (client->tail == client->head)
 111                         client->startup = 0;
 112         }
 113
 114         spin_unlock(&client->buffer_lock);
 115
 116         kill_fasync(&client->fasync, SIGIO, POLL_IN);
 117 }
 118
 119 static void joydev_event(struct input_handle *handle,
 120                          unsigned int type, unsigned int code, int value)
 121 {
 122         struct joydev *joydev = handle->private;
 123         struct joydev_client *client;
 124         struct js_event event;
 125
 126         switch (type) {
 127
 128         case EV_KEY:
 129                 if (code < BTN_MISC || value == 2)
 130                         return;
 131                 event.type = JS_EVENT_BUTTON;
 132                 event.number = joydev->keymap[code - BTN_MISC];
 133                 event.value = value;
 134                 break;
 135
 136         case EV_ABS:
 137                 event.type = JS_EVENT_AXIS;
 138                 event.number = joydev->absmap[code];
 139                 event.value = joydev_correct(value,
 140                                         &joydev->corr[event.number]);
 141                 if (event.value == joydev->abs[event.number])
 142                         return;
 143                 joydev->abs[event.number] = event.value;
 144                 break;
 145
 146         default:
 147                 return;
 148         }
 149
 150         event.time = jiffies_to_msecs(jiffies);
 151
 152         rcu_read_lock();
 153         list_for_each_entry_rcu(client, &joydev->client_list, node)
 154                 joydev_pass_event(client, &event);
 155         rcu_read_unlock();
 156
 157         wake_up_interruptible(&joydev->wait);
 158 }
 159
 160 static int joydev_fasync(int fd, struct file *file, int on)
 161 {
 162         struct joydev_client *client = file->private_data;
 163
 164         return fasync_helper(fd, file, on, &client->fasync);
 165 }
 166
 167 static void joydev_free(struct device *dev)
 168 {
 169         struct joydev *joydev = container_of(dev, struct joydev, dev);
 170
 171         input_put_device(joydev->handle.dev);
 172         kfree(joydev);
 173 }
 174
 175 static void joydev_attach_client(struct joydev *joydev,
 176                                  struct joydev_client *client)
 177 {
 178         spin_lock(&joydev->client_lock);
 179         list_add_tail_rcu(&client->node, &joydev->client_list);
 180         spin_unlock(&joydev->client_lock);
 181         synchronize_rcu();
 182 }
 183
 184 static void joydev_detach_client(struct joydev *joydev,
 185                                  struct joydev_client *client)
 186 {
 187         spin_lock(&joydev->client_lock);
 188         list_del_rcu(&client->node);
 189         spin_unlock(&joydev->client_lock);
 190         synchronize_rcu();
 191 }
 192
 193 static int joydev_open_device(struct joydev *joydev)
 194 {
 195         int retval;
 196
 197         retval = mutex_lock_interruptible(&joydev->mutex);
 198         if (retval)
 199                 return retval;
 200
 201         if (!joydev->exist)
 202                 retval = -ENODEV;
 203         else if (!joydev->open++) {
 204                 retval = input_open_device(&joydev->handle);
 205                 if (retval)
 206                         joydev->open--;
 207         }
 208
 209         mutex_unlock(&joydev->mutex);
 210         return retval;
 211 }
 212
 213 static void joydev_close_device(struct joydev *joydev)
 214 {
 215         mutex_lock(&joydev->mutex);
 216
 217         if (joydev->exist && !--joydev->open)
 218                 input_close_device(&joydev->handle);
 219
 220         mutex_unlock(&joydev->mutex);
 221 }
 222
 223 /*
 224  * Wake up users waiting for IO so they can disconnect from
 225  * dead device.
 226  */
 227 static void joydev_hangup(struct joydev *joydev)
 228 {
 229         struct joydev_client *client;
 230
 231         spin_lock(&joydev->client_lock);
 232         list_for_each_entry(client, &joydev->client_list, node)
 233                 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 234         spin_unlock(&joydev->client_lock);
 235
 236         wake_up_interruptible(&joydev->wait);
 237 }
 238
 239 static int joydev_release(struct inode *inode, struct file *file)
 240 {
 241         struct joydev_client *client = file->private_data;
 242         struct joydev *joydev = client->joydev;
 243
 244         joydev_detach_client(joydev, client);
 245         kfree(client);
 246
 247         joydev_close_device(joydev);
 248         put_device(&joydev->dev);
 249
 250         return 0;
 251 }
 252
 253 static int joydev_open(struct inode *inode, struct file *file)
 254 {
 255         struct joydev_client *client;
 256         struct joydev *joydev;
 257         int i = iminor(inode) - JOYDEV_MINOR_BASE;
 258         int error;
 259
 260         if (i >= JOYDEV_MINORS)
 261                 return -ENODEV;
 262
 263         error = mutex_lock_interruptible(&joydev_table_mutex);
 264         if (error)
 265                 return error;
 266         joydev = joydev_table[i];
 267         if (joydev)
 268                 get_device(&joydev->dev);
 269         mutex_unlock(&joydev_table_mutex);
 270
 271         if (!joydev)
 272                 return -ENODEV;
 273
 274         client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
 275         if (!client) {
 276                 error = -ENOMEM;
 277                 goto err_put_joydev;
 278         }
 279
 280         spin_lock_init(&client->buffer_lock);
 281         client->joydev = joydev;
 282         joydev_attach_client(joydev, client);
 283
 284         error = joydev_open_device(joydev);
 285         if (error)
 286                 goto err_free_client;
 287
 288         file->private_data = client;
 289         return 0;
 290
 291  err_free_client:
 292         joydev_detach_client(joydev, client);
 293         kfree(client);
 294  err_put_joydev:
 295         put_device(&joydev->dev);
 296         return error;
 297 }
 298
 299 static int joydev_generate_startup_event(struct joydev_client *client,
 300                                          struct input_dev *input,
 301                                          struct js_event *event)
 302 {
 303         struct joydev *joydev = client->joydev;
 304         int have_event;
 305
 306         spin_lock_irq(&client->buffer_lock);
 307
 308         have_event = client->startup < joydev->nabs + joydev->nkey;
 309
 310         if (have_event) {
 311
 312                 event->time = jiffies_to_msecs(jiffies);
 313                 if (client->startup < joydev->nkey) {
 314                         event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
 315                         event->number = client->startup;
 316                         event->value = !!test_bit(joydev->keypam[event->number],
 317                                                   input->key);
 318                 } else {
 319                         event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
 320                         event->number = client->startup - joydev->nkey;
 321                         event->value = joydev->abs[event->number];
 322                 }
 323                 client->startup++;
 324         }
 325
 326         spin_unlock_irq(&client->buffer_lock);
 327
 328         return have_event;
 329 }
 330
 331 static int joydev_fetch_next_event(struct joydev_client *client,
 332                                    struct js_event *event)
 333 {
 334         int have_event;
 335
 336         spin_lock_irq(&client->buffer_lock);
 337
 338         have_event = client->head != client->tail;
 339         if (have_event) {
 340                 *event = client->buffer[client->tail++];
 341                 client->tail &= JOYDEV_BUFFER_SIZE - 1;
 342         }
 343
 344         spin_unlock_irq(&client->buffer_lock);
 345
 346         return have_event;
 347 }
 348
 349 /*
 350  * Old joystick interface
 351  */
 352 static ssize_t joydev_0x_read(struct joydev_client *client,
 353                               struct input_dev *input,
 354                               char __user *buf)
 355 {
 356         struct joydev *joydev = client->joydev;
 357         struct JS_DATA_TYPE data;
 358         int i;
 359
 360         spin_lock_irq(&input->event_lock);
 361
 362         /*
 363          * Get device state
 364          */
 365         for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
 366                 data.buttons |=
 367                         test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
 368         data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
 369         data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
 370
 371         /*
 372          * Reset reader's event queue
 373          */
 374         spin_lock(&client->buffer_lock);
 375         client->startup = 0;
 376         client->tail = client->head;
 377         spin_unlock(&client->buffer_lock);
 378
 379         spin_unlock_irq(&input->event_lock);
 380
 381         if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 382                 return -EFAULT;
 383
 384         return sizeof(struct JS_DATA_TYPE);
 385 }
 386
 387 static inline int joydev_data_pending(struct joydev_client *client)
 388 {
 389         struct joydev *joydev = client->joydev;
 390
 391         return client->startup < joydev->nabs + joydev->nkey ||
 392                 client->head != client->tail;
 393 }
 394
 395 static ssize_t joydev_read(struct file *file, char __user *buf,
 396                            size_t count, loff_t *ppos)
 397 {
 398         struct joydev_client *client = file->private_data;
 399         struct joydev *joydev = client->joydev;
 400         struct input_dev *input = joydev->handle.dev;
 401         struct js_event event;
 402         int retval;
 403
 404         if (!joydev->exist)
 405                 return -ENODEV;
 406
 407         if (count < sizeof(struct js_event))
 408                 return -EINVAL;
 409
 410         if (count == sizeof(struct JS_DATA_TYPE))
 411                 return joydev_0x_read(client, input, buf);
 412
 413         if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
 414                 return -EAGAIN;
 415
 416         retval = wait_event_interruptible(joydev->wait,
 417                         !joydev->exist || joydev_data_pending(client));
 418         if (retval)
 419                 return retval;
 420
 421         if (!joydev->exist)
 422                 return -ENODEV;
 423
 424         while (retval + sizeof(struct js_event) <= count &&
 425                joydev_generate_startup_event(client, input, &event)) {
 426
 427                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 428                         return -EFAULT;
 429
 430                 retval += sizeof(struct js_event);
 431         }
 432
 433         while (retval + sizeof(struct js_event) <= count &&
 434                joydev_fetch_next_event(client, &event)) {
 435
 436                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 437                         return -EFAULT;
 438
 439                 retval += sizeof(struct js_event);
 440         }
 441
 442         return retval;
 443 }
 444
 445 /* No kernel lock - fine */
 446 static unsigned int joydev_poll(struct file *file, poll_table *wait)
 447 {
 448         struct joydev_client *client = file->private_data;
 449         struct joydev *joydev = client->joydev;
 450
 451         poll_wait(file, &joydev->wait, wait);
 452         return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
 453                 (joydev->exist ?  0 : (POLLHUP | POLLERR));
 454 }
 455
 456 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
 457                                      void __user *argp, size_t len)
 458 {
 459         __u8 *abspam;
 460         int i;
 461         int retval = 0;
 462
 463         len = min(len, sizeof(joydev->abspam));
 464
 465         /* Validate the map. */
 466         abspam = kmalloc(len, GFP_KERNEL);
 467         if (!abspam)
 468                 return -ENOMEM;
 469
 470         if (copy_from_user(abspam, argp, len)) {
 471                 retval = -EFAULT;
 472                 goto out;
 473         }
 474
 475         for (i = 0; i < joydev->nabs; i++) {
 476                 if (abspam[i] > ABS_MAX) {
 477                         retval = -EINVAL;
 478                         goto out;
 479                 }
 480         }
 481
 482         memcpy(joydev->abspam, abspam, len);
 483
 484  out:
 485         kfree(abspam);
 486         return retval;
 487 }
 488
 489 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
 490                                       void __user *argp, size_t len)
 491 {
 492         __u16 *keypam;
 493         int i;
 494         int retval = 0;
 495
 496         len = min(len, sizeof(joydev->keypam));
 497
 498         /* Validate the map. */
 499         keypam = kmalloc(len, GFP_KERNEL);
 500         if (!keypam)
 501                 return -ENOMEM;
 502
 503         if (copy_from_user(keypam, argp, len)) {
 504                 retval = -EFAULT;
 505                 goto out;
 506         }
 507
 508         for (i = 0; i < joydev->nkey; i++) {
 509                 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
 510                         retval = -EINVAL;
 511                         goto out;
 512                 }
 513         }
 514
 515         memcpy(joydev->keypam, keypam, len);
 516
 517         for (i = 0; i < joydev->nkey; i++)
 518                 joydev->keymap[keypam[i] - BTN_MISC] = i;
 519
 520  out:
 521         kfree(keypam);
 522         return retval;
 523 }
 524
 525
 526 static int joydev_ioctl_common(struct joydev *joydev,
 527                                 unsigned int cmd, void __user *argp)
 528 {
 529         struct input_dev *dev = joydev->handle.dev;
 530         size_t len;
 531         int i, j;
 532         const char *name;
 533
 534         /* Process fixed-sized commands. */
 535         switch (cmd) {
 536
 537         case JS_SET_CAL:
 538                 return copy_from_user(&joydev->glue.JS_CORR, argp,
 539                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 540
 541         case JS_GET_CAL:
 542                 return copy_to_user(argp, &joydev->glue.JS_CORR,
 543                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 544
 545         case JS_SET_TIMEOUT:
 546                 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 547
 548         case JS_GET_TIMEOUT:
 549                 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 550
 551         case JSIOCGVERSION:
 552                 return put_user(JS_VERSION, (__u32 __user *) argp);
 553
 554         case JSIOCGAXES:
 555                 return put_user(joydev->nabs, (__u8 __user *) argp);
 556
 557         case JSIOCGBUTTONS:
 558                 return put_user(joydev->nkey, (__u8 __user *) argp);
 559
 560         case JSIOCSCORR:
 561                 if (copy_from_user(joydev->corr, argp,
 562                               sizeof(joydev->corr[0]) * joydev->nabs))
 563                     return -EFAULT;
 564
 565                 for (i = 0; i < joydev->nabs; i++) {
 566                         j = joydev->abspam[i];
 567                         joydev->abs[i] = joydev_correct(dev->abs[j],
 568                                                         &joydev->corr[i]);
 569                 }
 570                 return 0;
 571
 572         case JSIOCGCORR:
 573                 return copy_to_user(argp, joydev->corr,
 574                         sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
 575
 576         }
 577
 578         /*
 579          * Process variable-sized commands (the axis and button map commands
 580          * are considered variable-sized to decouple them from the values of
 581          * ABS_MAX and KEY_MAX).
 582          */
 583         switch (cmd & ~IOCSIZE_MASK) {
 584
 585         case (JSIOCSAXMAP & ~IOCSIZE_MASK):
 586                 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
 587
 588         case (JSIOCGAXMAP & ~IOCSIZE_MASK):
 589                 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
 590                 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
 591
 592         case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
 593                 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
 594
 595         case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
 596                 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
 597                 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
 598
 599         case JSIOCGNAME(0):
 600                 name = dev->name;
 601                 if (!name)
 602                         return 0;
 603
 604                 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
 605                 return copy_to_user(argp, name, len) ? -EFAULT : len;
 606         }
 607
 608         return -EINVAL;
 609 }
 610
 611 #ifdef CONFIG_COMPAT
 612 static long joydev_compat_ioctl(struct file *file,
 613                                 unsigned int cmd, unsigned long arg)
 614 {
 615         struct joydev_client *client = file->private_data;
 616         struct joydev *joydev = client->joydev;
 617         void __user *argp = (void __user *)arg;
 618         s32 tmp32;
 619         struct JS_DATA_SAVE_TYPE_32 ds32;
 620         int retval;
 621
 622         retval = mutex_lock_interruptible(&joydev->mutex);
 623         if (retval)
 624                 return retval;
 625
 626         if (!joydev->exist) {
 627                 retval = -ENODEV;
 628                 goto out;
 629         }
 630
 631         switch (cmd) {
 632
 633         case JS_SET_TIMELIMIT:
 634                 retval = get_user(tmp32, (s32 __user *) arg);
 635                 if (retval == 0)
 636                         joydev->glue.JS_TIMELIMIT = tmp32;
 637                 break;
 638
 639         case JS_GET_TIMELIMIT:
 640                 tmp32 = joydev->glue.JS_TIMELIMIT;
 641                 retval = put_user(tmp32, (s32 __user *) arg);
 642                 break;
 643
 644         case JS_SET_ALL:
 645                 retval = copy_from_user(&ds32, argp,
 646                                         sizeof(ds32)) ? -EFAULT : 0;
 647                 if (retval == 0) {
 648                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
 649                         joydev->glue.BUSY          = ds32.BUSY;
 650                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
 651                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
 652                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
 653                         joydev->glue.JS_CORR       = ds32.JS_CORR;
 654                 }
 655                 break;
 656
 657         case JS_GET_ALL:
 658                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
 659                 ds32.BUSY          = joydev->glue.BUSY;
 660                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
 661                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
 662                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
 663                 ds32.JS_CORR       = joydev->glue.JS_CORR;
 664
 665                 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
 666                 break;
 667
 668         default:
 669                 retval = joydev_ioctl_common(joydev, cmd, argp);
 670                 break;
 671         }
 672
 673  out:
 674         mutex_unlock(&joydev->mutex);
 675         return retval;
 676 }
 677 #endif /* CONFIG_COMPAT */
 678
 679 static long joydev_ioctl(struct file *file,
 680                          unsigned int cmd, unsigned long arg)
 681 {
 682         struct joydev_client *client = file->private_data;
 683         struct joydev *joydev = client->joydev;
 684         void __user *argp = (void __user *)arg;
 685         int retval;
 686
 687         retval = mutex_lock_interruptible(&joydev->mutex);
 688         if (retval)
 689                 return retval;
 690
 691         if (!joydev->exist) {
 692                 retval = -ENODEV;
 693                 goto out;
 694         }
 695
 696         switch (cmd) {
 697
 698         case JS_SET_TIMELIMIT:
 699                 retval = get_user(joydev->glue.JS_TIMELIMIT,
 700                                   (long __user *) arg);
 701                 break;
 702
 703         case JS_GET_TIMELIMIT:
 704                 retval = put_user(joydev->glue.JS_TIMELIMIT,
 705                                   (long __user *) arg);
 706                 break;
 707
 708         case JS_SET_ALL:
 709                 retval = copy_from_user(&joydev->glue, argp,
 710                                         sizeof(joydev->glue)) ? -EFAULT: 0;
 711                 break;
 712
 713         case JS_GET_ALL:
 714                 retval = copy_to_user(argp, &joydev->glue,
 715                                       sizeof(joydev->glue)) ? -EFAULT : 0;
 716                 break;
 717
 718         default:
 719                 retval = joydev_ioctl_common(joydev, cmd, argp);
 720                 break;
 721         }
 722  out:
 723         mutex_unlock(&joydev->mutex);
 724         return retval;
 725 }
 726
 727 static const struct file_operations joydev_fops = {
 728         .owner          = THIS_MODULE,
 729         .read           = joydev_read,
 730         .poll           = joydev_poll,
 731         .open           = joydev_open,
 732         .release        = joydev_release,
 733         .unlocked_ioctl = joydev_ioctl,
 734 #ifdef CONFIG_COMPAT
 735         .compat_ioctl   = joydev_compat_ioctl,
 736 #endif
 737         .fasync         = joydev_fasync,
 738 };
 739
 740 static int joydev_install_chrdev(struct joydev *joydev)
 741 {
 742         joydev_table[joydev->minor] = joydev;
 743         return 0;
 744 }
 745
 746 static void joydev_remove_chrdev(struct joydev *joydev)
 747 {
 748         mutex_lock(&joydev_table_mutex);
 749         joydev_table[joydev->minor] = NULL;
 750         mutex_unlock(&joydev_table_mutex);
 751 }
 752
 753 /*
 754  * Mark device non-existant. This disables writes, ioctls and
 755  * prevents new users from opening the device. Already posted
 756  * blocking reads will stay, however new ones will fail.
 757  */
 758 static void joydev_mark_dead(struct joydev *joydev)
 759 {
 760         mutex_lock(&joydev->mutex);
 761         joydev->exist = 0;
 762         mutex_unlock(&joydev->mutex);
 763 }
 764
 765 static void joydev_cleanup(struct joydev *joydev)
 766 {
 767         struct input_handle *handle = &joydev->handle;
 768
 769         joydev_mark_dead(joydev);
 770         joydev_hangup(joydev);
 771         joydev_remove_chrdev(joydev);
 772
 773         /* joydev is marked dead so noone else accesses joydev->open */
 774         if (joydev->open)
 775                 input_close_device(handle);
 776 }
 777
 778 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
 779                           const struct input_device_id *id)
 780 {
 781         struct joydev *joydev;
 782         int i, j, t, minor;
 783         int error;
 784
 785         for (minor = 0; minor < JOYDEV_MINORS; minor++)
 786                 if (!joydev_table[minor])
 787                         break;
 788
 789         if (minor == JOYDEV_MINORS) {
 790                 printk(KERN_ERR "joydev: no more free joydev devices\n");
 791                 return -ENFILE;
 792         }
 793
 794         joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
 795         if (!joydev)
 796                 return -ENOMEM;
 797
 798         INIT_LIST_HEAD(&joydev->client_list);
 799         spin_lock_init(&joydev->client_lock);
 800         mutex_init(&joydev->mutex);
 801         init_waitqueue_head(&joydev->wait);
 802
 803         dev_set_name(&joydev->dev, "js%d", minor);
 804         joydev->exist = 1;
 805         joydev->minor = minor;
 806
 807         joydev->exist = 1;
 808         joydev->handle.dev = input_get_device(dev);
 809         joydev->handle.name = dev_name(&joydev->dev);
 810         joydev->handle.handler = handler;
 811         joydev->handle.private = joydev;
 812
 813         for (i = 0; i < ABS_MAX + 1; i++)
 814                 if (test_bit(i, dev->absbit)) {
 815                         joydev->absmap[i] = joydev->nabs;
 816                         joydev->abspam[joydev->nabs] = i;
 817                         joydev->nabs++;
 818                 }
 819
 820         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
 821                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 822                         joydev->keymap[i] = joydev->nkey;
 823                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 824                         joydev->nkey++;
 825                 }
 826
 827         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 828                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 829                         joydev->keymap[i] = joydev->nkey;
 830                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 831                         joydev->nkey++;
 832                 }
 833
 834         for (i = 0; i < joydev->nabs; i++) {
 835                 j = joydev->abspam[i];
 836                 if (dev->absmax[j] == dev->absmin[j]) {
 837                         joydev->corr[i].type = JS_CORR_NONE;
 838                         joydev->abs[i] = dev->abs[j];
 839                         continue;
 840                 }
 841                 joydev->corr[i].type = JS_CORR_BROKEN;
 842                 joydev->corr[i].prec = dev->absfuzz[j];
 843                 joydev->corr[i].coef[0] =
 844                         (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 845                 joydev->corr[i].coef[1] =
 846                         (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 847
 848                 t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
 849                 if (t) {
 850                         joydev->corr[i].coef[2] = (1 << 29) / t;
 851                         joydev->corr[i].coef[3] = (1 << 29) / t;
 852
 853                         joydev->abs[i] = joydev_correct(dev->abs[j],
 854                                                         joydev->corr + i);
 855                 }
 856         }
 857
 858         joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
 859         joydev->dev.class = &input_class;
 860         joydev->dev.parent = &dev->dev;
 861         joydev->dev.release = joydev_free;
 862         device_initialize(&joydev->dev);
 863
 864         error = input_register_handle(&joydev->handle);
 865         if (error)
 866                 goto err_free_joydev;
 867
 868         error = joydev_install_chrdev(joydev);
 869         if (error)
 870                 goto err_unregister_handle;
 871
 872         error = device_add(&joydev->dev);
 873         if (error)
 874                 goto err_cleanup_joydev;
 875
 876         return 0;
 877
 878  err_cleanup_joydev:
 879         joydev_cleanup(joydev);
 880  err_unregister_handle:
 881         input_unregister_handle(&joydev->handle);
 882  err_free_joydev:
 883         put_device(&joydev->dev);
 884         return error;
 885 }
 886
 887 static void joydev_disconnect(struct input_handle *handle)
 888 {
 889         struct joydev *joydev = handle->private;
 890
 891         device_del(&joydev->dev);
 892         joydev_cleanup(joydev);
 893         input_unregister_handle(handle);
 894         put_device(&joydev->dev);
 895 }
 896
 897 static const struct input_device_id joydev_blacklist[] = {
 898         {
 899                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
 900                                 INPUT_DEVICE_ID_MATCH_KEYBIT,
 901                 .evbit = { BIT_MASK(EV_KEY) },
 902                 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
 903         },      /* Avoid itouchpads and touchscreens */
 904         {
 905                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
 906                                 INPUT_DEVICE_ID_MATCH_KEYBIT,
 907                 .evbit = { BIT_MASK(EV_KEY) },
 908                 .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) },
 909         },      /* Avoid tablets, digitisers and similar devices */
 910         { }     /* Terminating entry */
 911 };
 912
 913 static const struct input_device_id joydev_ids[] = {
 914         {
 915                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
 916                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
 917                 .evbit = { BIT_MASK(EV_ABS) },
 918                 .absbit = { BIT_MASK(ABS_X) },
 919         },
 920         {
 921                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
 922                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
 923                 .evbit = { BIT_MASK(EV_ABS) },
 924                 .absbit = { BIT_MASK(ABS_WHEEL) },
 925         },
 926         {
 927                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
 928                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
 929                 .evbit = { BIT_MASK(EV_ABS) },
 930                 .absbit = { BIT_MASK(ABS_THROTTLE) },
 931         },
 932         { }     /* Terminating entry */
 933 };
 934
 935 MODULE_DEVICE_TABLE(input, joydev_ids);
 936
 937 static struct input_handler joydev_handler = {
 938         .event          = joydev_event,
 939         .connect        = joydev_connect,
 940         .disconnect     = joydev_disconnect,
 941         .fops           = &joydev_fops,
 942         .minor          = JOYDEV_MINOR_BASE,
 943         .name           = "joydev",
 944         .id_table       = joydev_ids,
 945         .blacklist      = joydev_blacklist,
 946 };
 947
 948 static int __init joydev_init(void)
 949 {
 950         return input_register_handler(&joydev_handler);
 951 }
 952
 953 static void __exit joydev_exit(void)
 954 {
 955         input_unregister_handler(&joydev_handler);
 956 }
 957
 958 module_init(joydev_init);
 959 module_exit(joydev_exit);