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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <asm/io.h>
  16 #include <linux/delay.h>
  17 #include <linux/errno.h>
  18 #include <linux/joystick.h>
  19 #include <linux/input.h>
  20 #include <linux/kernel.h>
  21 #include <linux/major.h>
  22 #include <linux/sched.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/module.h>
  26 #include <linux/poll.h>
  27 #include <linux/init.h>
  28 #include <linux/device.h>
  29 #include <linux/cdev.h>
  30
  31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  32 MODULE_DESCRIPTION("Joystick device interfaces");
  33 MODULE_SUPPORTED_DEVICE("input/js");
  34 MODULE_LICENSE("GPL");
  35
  36 #define JOYDEV_MINOR_BASE       0
  37 #define JOYDEV_MINORS           16
  38 #define JOYDEV_BUFFER_SIZE      64
  39
  40 struct joydev {
  41         int open;
  42         struct input_handle handle;
  43         wait_queue_head_t wait;
  44         struct list_head client_list;
  45         spinlock_t client_lock; /* protects client_list */
  46         struct mutex mutex;
  47         struct device dev;
  48         struct cdev cdev;
  49         bool exist;
  50
  51         struct js_corr corr[ABS_CNT];
  52         struct JS_DATA_SAVE_TYPE glue;
  53         int nabs;
  54         int nkey;
  55         __u16 keymap[KEY_MAX - BTN_MISC + 1];
  56         __u16 keypam[KEY_MAX - BTN_MISC + 1];
  57         __u8 absmap[ABS_CNT];
  58         __u8 abspam[ABS_CNT];
  59         __s16 abs[ABS_CNT];
  60 };
  61
  62 struct joydev_client {
  63         struct js_event buffer[JOYDEV_BUFFER_SIZE];
  64         int head;
  65         int tail;
  66         int startup;
  67         spinlock_t buffer_lock; /* protects access to buffer, head and tail */
  68         struct fasync_struct *fasync;
  69         struct joydev *joydev;
  70         struct list_head node;
  71 };
  72
  73 static int joydev_correct(int value, struct js_corr *corr)
  74 {
  75         switch (corr->type) {
  76
  77         case JS_CORR_NONE:
  78                 break;
  79
  80         case JS_CORR_BROKEN:
  81                 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
  82                         ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
  83                         ((corr->coef[2] * (value - corr->coef[0])) >> 14);
  84                 break;
  85
  86         default:
  87                 return 0;
  88         }
  89
  90         return clamp(value, -32767, 32767);
  91 }
  92
  93 static void joydev_pass_event(struct joydev_client *client,
  94                               struct js_event *event)
  95 {
  96         struct joydev *joydev = client->joydev;
  97
  98         /*
  99          * IRQs already disabled, just acquire the lock
 100          */
 101         spin_lock(&client->buffer_lock);
 102
 103         client->buffer[client->head] = *event;
 104
 105         if (client->startup == joydev->nabs + joydev->nkey) {
 106                 client->head++;
 107                 client->head &= JOYDEV_BUFFER_SIZE - 1;
 108                 if (client->tail == client->head)
 109                         client->startup = 0;
 110         }
 111
 112         spin_unlock(&client->buffer_lock);
 113
 114         kill_fasync(&client->fasync, SIGIO, POLL_IN);
 115 }
 116
 117 static void joydev_event(struct input_handle *handle,
 118                          unsigned int type, unsigned int code, int value)
 119 {
 120         struct joydev *joydev = handle->private;
 121         struct joydev_client *client;
 122         struct js_event event;
 123
 124         switch (type) {
 125
 126         case EV_KEY:
 127                 if (code < BTN_MISC || value == 2)
 128                         return;
 129                 event.type = JS_EVENT_BUTTON;
 130                 event.number = joydev->keymap[code - BTN_MISC];
 131                 event.value = value;
 132                 break;
 133
 134         case EV_ABS:
 135                 event.type = JS_EVENT_AXIS;
 136                 event.number = joydev->absmap[code];
 137                 event.value = joydev_correct(value,
 138                                         &joydev->corr[event.number]);
 139                 if (event.value == joydev->abs[event.number])
 140                         return;
 141                 joydev->abs[event.number] = event.value;
 142                 break;
 143
 144         default:
 145                 return;
 146         }
 147
 148         event.time = jiffies_to_msecs(jiffies);
 149
 150         rcu_read_lock();
 151         list_for_each_entry_rcu(client, &joydev->client_list, node)
 152                 joydev_pass_event(client, &event);
 153         rcu_read_unlock();
 154
 155         wake_up_interruptible(&joydev->wait);
 156 }
 157
 158 static int joydev_fasync(int fd, struct file *file, int on)
 159 {
 160         struct joydev_client *client = file->private_data;
 161
 162         return fasync_helper(fd, file, on, &client->fasync);
 163 }
 164
 165 static void joydev_free(struct device *dev)
 166 {
 167         struct joydev *joydev = container_of(dev, struct joydev, dev);
 168
 169         input_put_device(joydev->handle.dev);
 170         kfree(joydev);
 171 }
 172
 173 static void joydev_attach_client(struct joydev *joydev,
 174                                  struct joydev_client *client)
 175 {
 176         spin_lock(&joydev->client_lock);
 177         list_add_tail_rcu(&client->node, &joydev->client_list);
 178         spin_unlock(&joydev->client_lock);
 179 }
 180
 181 static void joydev_detach_client(struct joydev *joydev,
 182                                  struct joydev_client *client)
 183 {
 184         spin_lock(&joydev->client_lock);
 185         list_del_rcu(&client->node);
 186         spin_unlock(&joydev->client_lock);
 187         synchronize_rcu();
 188 }
 189
 190 static void joydev_refresh_state(struct joydev *joydev)
 191 {
 192         struct input_dev *dev = joydev->handle.dev;
 193         int i, val;
 194
 195         for (i = 0; i < joydev->nabs; i++) {
 196                 val = input_abs_get_val(dev, joydev->abspam[i]);
 197                 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
 198         }
 199 }
 200
 201 static int joydev_open_device(struct joydev *joydev)
 202 {
 203         int retval;
 204
 205         retval = mutex_lock_interruptible(&joydev->mutex);
 206         if (retval)
 207                 return retval;
 208
 209         if (!joydev->exist)
 210                 retval = -ENODEV;
 211         else if (!joydev->open++) {
 212                 retval = input_open_device(&joydev->handle);
 213                 if (retval)
 214                         joydev->open--;
 215                 else
 216                         joydev_refresh_state(joydev);
 217         }
 218
 219         mutex_unlock(&joydev->mutex);
 220         return retval;
 221 }
 222
 223 static void joydev_close_device(struct joydev *joydev)
 224 {
 225         mutex_lock(&joydev->mutex);
 226
 227         if (joydev->exist && !--joydev->open)
 228                 input_close_device(&joydev->handle);
 229
 230         mutex_unlock(&joydev->mutex);
 231 }
 232
 233 /*
 234  * Wake up users waiting for IO so they can disconnect from
 235  * dead device.
 236  */
 237 static void joydev_hangup(struct joydev *joydev)
 238 {
 239         struct joydev_client *client;
 240
 241         spin_lock(&joydev->client_lock);
 242         list_for_each_entry(client, &joydev->client_list, node)
 243                 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 244         spin_unlock(&joydev->client_lock);
 245
 246         wake_up_interruptible(&joydev->wait);
 247 }
 248
 249 static int joydev_release(struct inode *inode, struct file *file)
 250 {
 251         struct joydev_client *client = file->private_data;
 252         struct joydev *joydev = client->joydev;
 253
 254         joydev_detach_client(joydev, client);
 255         kfree(client);
 256
 257         joydev_close_device(joydev);
 258
 259         return 0;
 260 }
 261
 262 static int joydev_open(struct inode *inode, struct file *file)
 263 {
 264         struct joydev *joydev =
 265                         container_of(inode->i_cdev, struct joydev, cdev);
 266         struct joydev_client *client;
 267         int error;
 268
 269         client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
 270         if (!client)
 271                 return -ENOMEM;
 272
 273         spin_lock_init(&client->buffer_lock);
 274         client->joydev = joydev;
 275         joydev_attach_client(joydev, client);
 276
 277         error = joydev_open_device(joydev);
 278         if (error)
 279                 goto err_free_client;
 280
 281         file->private_data = client;
 282         nonseekable_open(inode, file);
 283
 284         return 0;
 285
 286  err_free_client:
 287         joydev_detach_client(joydev, client);
 288         kfree(client);
 289         return error;
 290 }
 291
 292 static int joydev_generate_startup_event(struct joydev_client *client,
 293                                          struct input_dev *input,
 294                                          struct js_event *event)
 295 {
 296         struct joydev *joydev = client->joydev;
 297         int have_event;
 298
 299         spin_lock_irq(&client->buffer_lock);
 300
 301         have_event = client->startup < joydev->nabs + joydev->nkey;
 302
 303         if (have_event) {
 304
 305                 event->time = jiffies_to_msecs(jiffies);
 306                 if (client->startup < joydev->nkey) {
 307                         event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
 308                         event->number = client->startup;
 309                         event->value = !!test_bit(joydev->keypam[event->number],
 310                                                   input->key);
 311                 } else {
 312                         event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
 313                         event->number = client->startup - joydev->nkey;
 314                         event->value = joydev->abs[event->number];
 315                 }
 316                 client->startup++;
 317         }
 318
 319         spin_unlock_irq(&client->buffer_lock);
 320
 321         return have_event;
 322 }
 323
 324 static int joydev_fetch_next_event(struct joydev_client *client,
 325                                    struct js_event *event)
 326 {
 327         int have_event;
 328
 329         spin_lock_irq(&client->buffer_lock);
 330
 331         have_event = client->head != client->tail;
 332         if (have_event) {
 333                 *event = client->buffer[client->tail++];
 334                 client->tail &= JOYDEV_BUFFER_SIZE - 1;
 335         }
 336
 337         spin_unlock_irq(&client->buffer_lock);
 338
 339         return have_event;
 340 }
 341
 342 /*
 343  * Old joystick interface
 344  */
 345 static ssize_t joydev_0x_read(struct joydev_client *client,
 346                               struct input_dev *input,
 347                               char __user *buf)
 348 {
 349         struct joydev *joydev = client->joydev;
 350         struct JS_DATA_TYPE data;
 351         int i;
 352
 353         spin_lock_irq(&input->event_lock);
 354
 355         /*
 356          * Get device state
 357          */
 358         for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
 359                 data.buttons |=
 360                         test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
 361         data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
 362         data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
 363
 364         /*
 365          * Reset reader's event queue
 366          */
 367         spin_lock(&client->buffer_lock);
 368         client->startup = 0;
 369         client->tail = client->head;
 370         spin_unlock(&client->buffer_lock);
 371
 372         spin_unlock_irq(&input->event_lock);
 373
 374         if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 375                 return -EFAULT;
 376
 377         return sizeof(struct JS_DATA_TYPE);
 378 }
 379
 380 static inline int joydev_data_pending(struct joydev_client *client)
 381 {
 382         struct joydev *joydev = client->joydev;
 383
 384         return client->startup < joydev->nabs + joydev->nkey ||
 385                 client->head != client->tail;
 386 }
 387
 388 static ssize_t joydev_read(struct file *file, char __user *buf,
 389                            size_t count, loff_t *ppos)
 390 {
 391         struct joydev_client *client = file->private_data;
 392         struct joydev *joydev = client->joydev;
 393         struct input_dev *input = joydev->handle.dev;
 394         struct js_event event;
 395         int retval;
 396
 397         if (!joydev->exist)
 398                 return -ENODEV;
 399
 400         if (count < sizeof(struct js_event))
 401                 return -EINVAL;
 402
 403         if (count == sizeof(struct JS_DATA_TYPE))
 404                 return joydev_0x_read(client, input, buf);
 405
 406         if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
 407                 return -EAGAIN;
 408
 409         retval = wait_event_interruptible(joydev->wait,
 410                         !joydev->exist || joydev_data_pending(client));
 411         if (retval)
 412                 return retval;
 413
 414         if (!joydev->exist)
 415                 return -ENODEV;
 416
 417         while (retval + sizeof(struct js_event) <= count &&
 418                joydev_generate_startup_event(client, input, &event)) {
 419
 420                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 421                         return -EFAULT;
 422
 423                 retval += sizeof(struct js_event);
 424         }
 425
 426         while (retval + sizeof(struct js_event) <= count &&
 427                joydev_fetch_next_event(client, &event)) {
 428
 429                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 430                         return -EFAULT;
 431
 432                 retval += sizeof(struct js_event);
 433         }
 434
 435         return retval;
 436 }
 437
 438 /* No kernel lock - fine */
 439 static unsigned int joydev_poll(struct file *file, poll_table *wait)
 440 {
 441         struct joydev_client *client = file->private_data;
 442         struct joydev *joydev = client->joydev;
 443
 444         poll_wait(file, &joydev->wait, wait);
 445         return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
 446                 (joydev->exist ?  0 : (POLLHUP | POLLERR));
 447 }
 448
 449 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
 450                                      void __user *argp, size_t len)
 451 {
 452         __u8 *abspam;
 453         int i;
 454         int retval = 0;
 455
 456         len = min(len, sizeof(joydev->abspam));
 457
 458         /* Validate the map. */
 459         abspam = memdup_user(argp, len);
 460         if (IS_ERR(abspam))
 461                 return PTR_ERR(abspam);
 462
 463         for (i = 0; i < len && i < joydev->nabs; i++) {
 464                 if (abspam[i] > ABS_MAX) {
 465                         retval = -EINVAL;
 466                         goto out;
 467                 }
 468         }
 469
 470         memcpy(joydev->abspam, abspam, len);
 471
 472         for (i = 0; i < joydev->nabs; i++)
 473                 joydev->absmap[joydev->abspam[i]] = i;
 474
 475  out:
 476         kfree(abspam);
 477         return retval;
 478 }
 479
 480 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
 481                                       void __user *argp, size_t len)
 482 {
 483         __u16 *keypam;
 484         int i;
 485         int retval = 0;
 486
 487         if (len % sizeof(*keypam))
 488                 return -EINVAL;
 489
 490         len = min(len, sizeof(joydev->keypam));
 491
 492         /* Validate the map. */
 493         keypam = memdup_user(argp, len);
 494         if (IS_ERR(keypam))
 495                 return PTR_ERR(keypam);
 496
 497         for (i = 0; i < (len / 2) && i < joydev->nkey; i++) {
 498                 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
 499                         retval = -EINVAL;
 500                         goto out;
 501                 }
 502         }
 503
 504         memcpy(joydev->keypam, keypam, len);
 505
 506         for (i = 0; i < joydev->nkey; i++)
 507                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
 508
 509  out:
 510         kfree(keypam);
 511         return retval;
 512 }
 513
 514
 515 static int joydev_ioctl_common(struct joydev *joydev,
 516                                 unsigned int cmd, void __user *argp)
 517 {
 518         struct input_dev *dev = joydev->handle.dev;
 519         size_t len;
 520         int i;
 521         const char *name;
 522
 523         /* Process fixed-sized commands. */
 524         switch (cmd) {
 525
 526         case JS_SET_CAL:
 527                 return copy_from_user(&joydev->glue.JS_CORR, argp,
 528                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 529
 530         case JS_GET_CAL:
 531                 return copy_to_user(argp, &joydev->glue.JS_CORR,
 532                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 533
 534         case JS_SET_TIMEOUT:
 535                 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 536
 537         case JS_GET_TIMEOUT:
 538                 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 539
 540         case JSIOCGVERSION:
 541                 return put_user(JS_VERSION, (__u32 __user *) argp);
 542
 543         case JSIOCGAXES:
 544                 return put_user(joydev->nabs, (__u8 __user *) argp);
 545
 546         case JSIOCGBUTTONS:
 547                 return put_user(joydev->nkey, (__u8 __user *) argp);
 548
 549         case JSIOCSCORR:
 550                 if (copy_from_user(joydev->corr, argp,
 551                               sizeof(joydev->corr[0]) * joydev->nabs))
 552                         return -EFAULT;
 553
 554                 for (i = 0; i < joydev->nabs; i++) {
 555                         int val = input_abs_get_val(dev, joydev->abspam[i]);
 556                         joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
 557                 }
 558                 return 0;
 559
 560         case JSIOCGCORR:
 561                 return copy_to_user(argp, joydev->corr,
 562                         sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
 563
 564         }
 565
 566         /*
 567          * Process variable-sized commands (the axis and button map commands
 568          * are considered variable-sized to decouple them from the values of
 569          * ABS_MAX and KEY_MAX).
 570          */
 571         switch (cmd & ~IOCSIZE_MASK) {
 572
 573         case (JSIOCSAXMAP & ~IOCSIZE_MASK):
 574                 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
 575
 576         case (JSIOCGAXMAP & ~IOCSIZE_MASK):
 577                 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
 578                 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
 579
 580         case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
 581                 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
 582
 583         case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
 584                 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
 585                 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
 586
 587         case JSIOCGNAME(0):
 588                 name = dev->name;
 589                 if (!name)
 590                         return 0;
 591
 592                 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
 593                 return copy_to_user(argp, name, len) ? -EFAULT : len;
 594         }
 595
 596         return -EINVAL;
 597 }
 598
 599 #ifdef CONFIG_COMPAT
 600 static long joydev_compat_ioctl(struct file *file,
 601                                 unsigned int cmd, unsigned long arg)
 602 {
 603         struct joydev_client *client = file->private_data;
 604         struct joydev *joydev = client->joydev;
 605         void __user *argp = (void __user *)arg;
 606         s32 tmp32;
 607         struct JS_DATA_SAVE_TYPE_32 ds32;
 608         int retval;
 609
 610         retval = mutex_lock_interruptible(&joydev->mutex);
 611         if (retval)
 612                 return retval;
 613
 614         if (!joydev->exist) {
 615                 retval = -ENODEV;
 616                 goto out;
 617         }
 618
 619         switch (cmd) {
 620
 621         case JS_SET_TIMELIMIT:
 622                 retval = get_user(tmp32, (s32 __user *) arg);
 623                 if (retval == 0)
 624                         joydev->glue.JS_TIMELIMIT = tmp32;
 625                 break;
 626
 627         case JS_GET_TIMELIMIT:
 628                 tmp32 = joydev->glue.JS_TIMELIMIT;
 629                 retval = put_user(tmp32, (s32 __user *) arg);
 630                 break;
 631
 632         case JS_SET_ALL:
 633                 retval = copy_from_user(&ds32, argp,
 634                                         sizeof(ds32)) ? -EFAULT : 0;
 635                 if (retval == 0) {
 636                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
 637                         joydev->glue.BUSY          = ds32.BUSY;
 638                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
 639                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
 640                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
 641                         joydev->glue.JS_CORR       = ds32.JS_CORR;
 642                 }
 643                 break;
 644
 645         case JS_GET_ALL:
 646                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
 647                 ds32.BUSY          = joydev->glue.BUSY;
 648                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
 649                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
 650                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
 651                 ds32.JS_CORR       = joydev->glue.JS_CORR;
 652
 653                 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
 654                 break;
 655
 656         default:
 657                 retval = joydev_ioctl_common(joydev, cmd, argp);
 658                 break;
 659         }
 660
 661  out:
 662         mutex_unlock(&joydev->mutex);
 663         return retval;
 664 }
 665 #endif /* CONFIG_COMPAT */
 666
 667 static long joydev_ioctl(struct file *file,
 668                          unsigned int cmd, unsigned long arg)
 669 {
 670         struct joydev_client *client = file->private_data;
 671         struct joydev *joydev = client->joydev;
 672         void __user *argp = (void __user *)arg;
 673         int retval;
 674
 675         retval = mutex_lock_interruptible(&joydev->mutex);
 676         if (retval)
 677                 return retval;
 678
 679         if (!joydev->exist) {
 680                 retval = -ENODEV;
 681                 goto out;
 682         }
 683
 684         switch (cmd) {
 685
 686         case JS_SET_TIMELIMIT:
 687                 retval = get_user(joydev->glue.JS_TIMELIMIT,
 688                                   (long __user *) arg);
 689                 break;
 690
 691         case JS_GET_TIMELIMIT:
 692                 retval = put_user(joydev->glue.JS_TIMELIMIT,
 693                                   (long __user *) arg);
 694                 break;
 695
 696         case JS_SET_ALL:
 697                 retval = copy_from_user(&joydev->glue, argp,
 698                                         sizeof(joydev->glue)) ? -EFAULT : 0;
 699                 break;
 700
 701         case JS_GET_ALL:
 702                 retval = copy_to_user(argp, &joydev->glue,
 703                                       sizeof(joydev->glue)) ? -EFAULT : 0;
 704                 break;
 705
 706         default:
 707                 retval = joydev_ioctl_common(joydev, cmd, argp);
 708                 break;
 709         }
 710  out:
 711         mutex_unlock(&joydev->mutex);
 712         return retval;
 713 }
 714
 715 static const struct file_operations joydev_fops = {
 716         .owner          = THIS_MODULE,
 717         .read           = joydev_read,
 718         .poll           = joydev_poll,
 719         .open           = joydev_open,
 720         .release        = joydev_release,
 721         .unlocked_ioctl = joydev_ioctl,
 722 #ifdef CONFIG_COMPAT
 723         .compat_ioctl   = joydev_compat_ioctl,
 724 #endif
 725         .fasync         = joydev_fasync,
 726         .llseek         = no_llseek,
 727 };
 728
 729 /*
 730  * Mark device non-existent. This disables writes, ioctls and
 731  * prevents new users from opening the device. Already posted
 732  * blocking reads will stay, however new ones will fail.
 733  */
 734 static void joydev_mark_dead(struct joydev *joydev)
 735 {
 736         mutex_lock(&joydev->mutex);
 737         joydev->exist = false;
 738         mutex_unlock(&joydev->mutex);
 739 }
 740
 741 static void joydev_cleanup(struct joydev *joydev)
 742 {
 743         struct input_handle *handle = &joydev->handle;
 744
 745         joydev_mark_dead(joydev);
 746         joydev_hangup(joydev);
 747
 748         /* joydev is marked dead so no one else accesses joydev->open */
 749         if (joydev->open)
 750                 input_close_device(handle);
 751 }
 752
 753 /*
 754  * These codes are copied from from hid-ids.h, unfortunately there is no common
 755  * usb_ids/bt_ids.h header.
 756  */
 757 #define USB_VENDOR_ID_SONY                      0x054c
 758 #define USB_DEVICE_ID_SONY_PS3_CONTROLLER               0x0268
 759 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER               0x05c4
 760 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER_2             0x09cc
 761 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE        0x0ba0
 762
 763 #define USB_VENDOR_ID_THQ                       0x20d6
 764 #define USB_DEVICE_ID_THQ_PS3_UDRAW                     0xcb17
 765
 766 #define ACCEL_DEV(vnd, prd)                                             \
 767         {                                                               \
 768                 .flags = INPUT_DEVICE_ID_MATCH_VENDOR |                 \
 769                                 INPUT_DEVICE_ID_MATCH_PRODUCT |         \
 770                                 INPUT_DEVICE_ID_MATCH_PROPBIT,          \
 771                 .vendor = (vnd),                                        \
 772                 .product = (prd),                                       \
 773                 .propbit = { BIT_MASK(INPUT_PROP_ACCELEROMETER) },      \
 774         }
 775
 776 static const struct input_device_id joydev_blacklist[] = {
 777         /* Avoid touchpads and touchscreens */
 778         {
 779                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
 780                                 INPUT_DEVICE_ID_MATCH_KEYBIT,
 781                 .evbit = { BIT_MASK(EV_KEY) },
 782                 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
 783         },
 784         /* Avoid tablets, digitisers and similar devices */
 785         {
 786                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
 787                                 INPUT_DEVICE_ID_MATCH_KEYBIT,
 788                 .evbit = { BIT_MASK(EV_KEY) },
 789                 .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) },
 790         },
 791         /* Disable accelerometers on composite devices */
 792         ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER),
 793         ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER),
 794         ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_2),
 795         ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE),
 796         ACCEL_DEV(USB_VENDOR_ID_THQ, USB_DEVICE_ID_THQ_PS3_UDRAW),
 797         { /* sentinel */ }
 798 };
 799
 800 static bool joydev_dev_is_blacklisted(struct input_dev *dev)
 801 {
 802         const struct input_device_id *id;
 803
 804         for (id = joydev_blacklist; id->flags; id++) {
 805                 if (input_match_device_id(dev, id)) {
 806                         dev_dbg(&dev->dev,
 807                                 "joydev: blacklisting '%s'\n", dev->name);
 808                         return true;
 809                 }
 810         }
 811
 812         return false;
 813 }
 814
 815 static bool joydev_dev_is_absolute_mouse(struct input_dev *dev)
 816 {
 817         DECLARE_BITMAP(jd_scratch, KEY_CNT);
 818
 819         BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT);
 820
 821         /*
 822          * Virtualization (VMware, etc) and remote management (HP
 823          * ILO2) solutions use absolute coordinates for their virtual
 824          * pointing devices so that there is one-to-one relationship
 825          * between pointer position on the host screen and virtual
 826          * guest screen, and so their mice use ABS_X, ABS_Y and 3
 827          * primary button events. This clashes with what joydev
 828          * considers to be joysticks (a device with at minimum ABS_X
 829          * axis).
 830          *
 831          * Here we are trying to separate absolute mice from
 832          * joysticks. A device is, for joystick detection purposes,
 833          * considered to be an absolute mouse if the following is
 834          * true:
 835          *
 836          * 1) Event types are exactly EV_ABS, EV_KEY and EV_SYN.
 837          * 2) Absolute events are exactly ABS_X and ABS_Y.
 838          * 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE.
 839          * 4) Device is not on "Amiga" bus.
 840          */
 841
 842         bitmap_zero(jd_scratch, EV_CNT);
 843         __set_bit(EV_ABS, jd_scratch);
 844         __set_bit(EV_KEY, jd_scratch);
 845         __set_bit(EV_SYN, jd_scratch);
 846         if (!bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
 847                 return false;
 848
 849         bitmap_zero(jd_scratch, ABS_CNT);
 850         __set_bit(ABS_X, jd_scratch);
 851         __set_bit(ABS_Y, jd_scratch);
 852         if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT))
 853                 return false;
 854
 855         bitmap_zero(jd_scratch, KEY_CNT);
 856         __set_bit(BTN_LEFT, jd_scratch);
 857         __set_bit(BTN_RIGHT, jd_scratch);
 858         __set_bit(BTN_MIDDLE, jd_scratch);
 859
 860         if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT))
 861                 return false;
 862
 863         /*
 864          * Amiga joystick (amijoy) historically uses left/middle/right
 865          * button events.
 866          */
 867         if (dev->id.bustype == BUS_AMIGA)
 868                 return false;
 869
 870         return true;
 871 }
 872
 873 static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
 874 {
 875         /* Disable blacklisted devices */
 876         if (joydev_dev_is_blacklisted(dev))
 877                 return false;
 878
 879         /* Avoid absolute mice */
 880         if (joydev_dev_is_absolute_mouse(dev))
 881                 return false;
 882
 883         return true;
 884 }
 885
 886 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
 887                           const struct input_device_id *id)
 888 {
 889         struct joydev *joydev;
 890         int i, j, t, minor, dev_no;
 891         int error;
 892
 893         minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true);
 894         if (minor < 0) {
 895                 error = minor;
 896                 pr_err("failed to reserve new minor: %d\n", error);
 897                 return error;
 898         }
 899
 900         joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
 901         if (!joydev) {
 902                 error = -ENOMEM;
 903                 goto err_free_minor;
 904         }
 905
 906         INIT_LIST_HEAD(&joydev->client_list);
 907         spin_lock_init(&joydev->client_lock);
 908         mutex_init(&joydev->mutex);
 909         init_waitqueue_head(&joydev->wait);
 910         joydev->exist = true;
 911
 912         dev_no = minor;
 913         /* Normalize device number if it falls into legacy range */
 914         if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS)
 915                 dev_no -= JOYDEV_MINOR_BASE;
 916         dev_set_name(&joydev->dev, "js%d", dev_no);
 917
 918         joydev->handle.dev = input_get_device(dev);
 919         joydev->handle.name = dev_name(&joydev->dev);
 920         joydev->handle.handler = handler;
 921         joydev->handle.private = joydev;
 922
 923         for_each_set_bit(i, dev->absbit, ABS_CNT) {
 924                 joydev->absmap[i] = joydev->nabs;
 925                 joydev->abspam[joydev->nabs] = i;
 926                 joydev->nabs++;
 927         }
 928
 929         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
 930                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 931                         joydev->keymap[i] = joydev->nkey;
 932                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 933                         joydev->nkey++;
 934                 }
 935
 936         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 937                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 938                         joydev->keymap[i] = joydev->nkey;
 939                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 940                         joydev->nkey++;
 941                 }
 942
 943         for (i = 0; i < joydev->nabs; i++) {
 944                 j = joydev->abspam[i];
 945                 if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
 946                         joydev->corr[i].type = JS_CORR_NONE;
 947                         continue;
 948                 }
 949                 joydev->corr[i].type = JS_CORR_BROKEN;
 950                 joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
 951
 952                 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
 953                 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
 954                 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
 955
 956                 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
 957                         - 2 * input_abs_get_flat(dev, j);
 958                 if (t) {
 959                         joydev->corr[i].coef[2] = (1 << 29) / t;
 960                         joydev->corr[i].coef[3] = (1 << 29) / t;
 961                 }
 962         }
 963
 964         joydev->dev.devt = MKDEV(INPUT_MAJOR, minor);
 965         joydev->dev.class = &input_class;
 966         joydev->dev.parent = &dev->dev;
 967         joydev->dev.release = joydev_free;
 968         device_initialize(&joydev->dev);
 969
 970         error = input_register_handle(&joydev->handle);
 971         if (error)
 972                 goto err_free_joydev;
 973
 974         cdev_init(&joydev->cdev, &joydev_fops);
 975
 976         error = cdev_device_add(&joydev->cdev, &joydev->dev);
 977         if (error)
 978                 goto err_cleanup_joydev;
 979
 980         return 0;
 981
 982  err_cleanup_joydev:
 983         joydev_cleanup(joydev);
 984         input_unregister_handle(&joydev->handle);
 985  err_free_joydev:
 986         put_device(&joydev->dev);
 987  err_free_minor:
 988         input_free_minor(minor);
 989         return error;
 990 }
 991
 992 static void joydev_disconnect(struct input_handle *handle)
 993 {
 994         struct joydev *joydev = handle->private;
 995
 996         cdev_device_del(&joydev->cdev, &joydev->dev);
 997         joydev_cleanup(joydev);
 998         input_free_minor(MINOR(joydev->dev.devt));
 999         input_unregister_handle(handle);
1000         put_device(&joydev->dev);
1001 }
1002
1003 static const struct input_device_id joydev_ids[] = {
1004         {
1005                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1006                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
1007                 .evbit = { BIT_MASK(EV_ABS) },
1008                 .absbit = { BIT_MASK(ABS_X) },
1009         },
1010         {
1011                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1012                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
1013                 .evbit = { BIT_MASK(EV_ABS) },
1014                 .absbit = { BIT_MASK(ABS_Z) },
1015         },
1016         {
1017                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1018                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
1019                 .evbit = { BIT_MASK(EV_ABS) },
1020                 .absbit = { BIT_MASK(ABS_WHEEL) },
1021         },
1022         {
1023                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1024                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
1025                 .evbit = { BIT_MASK(EV_ABS) },
1026                 .absbit = { BIT_MASK(ABS_THROTTLE) },
1027         },
1028         {
1029                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1030                                 INPUT_DEVICE_ID_MATCH_KEYBIT,
1031                 .evbit = { BIT_MASK(EV_KEY) },
1032                 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
1033         },
1034         {
1035                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1036                                 INPUT_DEVICE_ID_MATCH_KEYBIT,
1037                 .evbit = { BIT_MASK(EV_KEY) },
1038                 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
1039         },
1040         {
1041                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1042                                 INPUT_DEVICE_ID_MATCH_KEYBIT,
1043                 .evbit = { BIT_MASK(EV_KEY) },
1044                 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
1045         },
1046         { }     /* Terminating entry */
1047 };
1048
1049 MODULE_DEVICE_TABLE(input, joydev_ids);
1050
1051 static struct input_handler joydev_handler = {
1052         .event          = joydev_event,
1053         .match          = joydev_match,
1054         .connect        = joydev_connect,
1055         .disconnect     = joydev_disconnect,
1056         .legacy_minors  = true,
1057         .minor          = JOYDEV_MINOR_BASE,
1058         .name           = "joydev",
1059         .id_table       = joydev_ids,
1060 };
1061
1062 static int __init joydev_init(void)
1063 {
1064         return input_register_handler(&joydev_handler);
1065 }
1066
1067 static void __exit joydev_exit(void)
1068 {
1069         input_unregister_handler(&joydev_handler);
1070 }
1071
1072 module_init(joydev_init);
1073 module_exit(joydev_exit);