drivers/input/evdev.c

   1 /*
   2  * Event char devices, giving access to raw input device events.
   3  *
   4  * Copyright (c) 1999-2002 Vojtech Pavlik
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  */
  10
  11 #define EVDEV_MINOR_BASE        64
  12 #define EVDEV_MINORS            32
  13 #define EVDEV_BUFFER_SIZE       64
  14
  15 #include <linux/poll.h>
  16 #include <linux/slab.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/input.h>
  20 #include <linux/major.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/device.h>
  23 #include <linux/compat.h>
  24
  25 struct evdev {
  26         int exist;
  27         int open;
  28         int minor;
  29         char name[16];
  30         struct input_handle handle;
  31         wait_queue_head_t wait;
  32         struct evdev_list *grab;
  33         struct list_head list;
  34 };
  35
  36 struct evdev_list {
  37         struct input_event buffer[EVDEV_BUFFER_SIZE];
  38         int head;
  39         int tail;
  40         struct fasync_struct *fasync;
  41         struct evdev *evdev;
  42         struct list_head node;
  43 };
  44
  45 static struct evdev *evdev_table[EVDEV_MINORS];
  46
  47 static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  48 {
  49         struct evdev *evdev = handle->private;
  50         struct evdev_list *list;
  51
  52         if (evdev->grab) {
  53                 list = evdev->grab;
  54
  55                 do_gettimeofday(&list->buffer[list->head].time);
  56                 list->buffer[list->head].type = type;
  57                 list->buffer[list->head].code = code;
  58                 list->buffer[list->head].value = value;
  59                 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
  60
  61                 kill_fasync(&list->fasync, SIGIO, POLL_IN);
  62         } else
  63                 list_for_each_entry(list, &evdev->list, node) {
  64
  65                         do_gettimeofday(&list->buffer[list->head].time);
  66                         list->buffer[list->head].type = type;
  67                         list->buffer[list->head].code = code;
  68                         list->buffer[list->head].value = value;
  69                         list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
  70
  71                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
  72                 }
  73
  74         wake_up_interruptible(&evdev->wait);
  75 }
  76
  77 static int evdev_fasync(int fd, struct file *file, int on)
  78 {
  79         int retval;
  80         struct evdev_list *list = file->private_data;
  81         retval = fasync_helper(fd, file, on, &list->fasync);
  82         return retval < 0 ? retval : 0;
  83 }
  84
  85 static int evdev_flush(struct file * file)
  86 {
  87         struct evdev_list *list = file->private_data;
  88         if (!list->evdev->exist) return -ENODEV;
  89         return input_flush_device(&list->evdev->handle, file);
  90 }
  91
  92 static void evdev_free(struct evdev *evdev)
  93 {
  94         evdev_table[evdev->minor] = NULL;
  95         kfree(evdev);
  96 }
  97
  98 static int evdev_release(struct inode * inode, struct file * file)
  99 {
 100         struct evdev_list *list = file->private_data;
 101
 102         if (list->evdev->grab == list) {
 103                 input_release_device(&list->evdev->handle);
 104                 list->evdev->grab = NULL;
 105         }
 106
 107         evdev_fasync(-1, file, 0);
 108         list_del(&list->node);
 109
 110         if (!--list->evdev->open) {
 111                 if (list->evdev->exist)
 112                         input_close_device(&list->evdev->handle);
 113                 else
 114                         evdev_free(list->evdev);
 115         }
 116
 117         kfree(list);
 118         return 0;
 119 }
 120
 121 static int evdev_open(struct inode * inode, struct file * file)
 122 {
 123         struct evdev_list *list;
 124         int i = iminor(inode) - EVDEV_MINOR_BASE;
 125         int accept_err;
 126
 127         if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
 128                 return -ENODEV;
 129
 130         if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
 131                 return accept_err;
 132
 133         if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
 134                 return -ENOMEM;
 135         memset(list, 0, sizeof(struct evdev_list));
 136
 137         list->evdev = evdev_table[i];
 138         list_add_tail(&list->node, &evdev_table[i]->list);
 139         file->private_data = list;
 140
 141         if (!list->evdev->open++)
 142                 if (list->evdev->exist)
 143                         input_open_device(&list->evdev->handle);
 144
 145         return 0;
 146 }
 147
 148 #ifdef CONFIG_COMPAT
 149 struct input_event_compat {
 150         struct compat_timeval time;
 151         __u16 type;
 152         __u16 code;
 153         __s32 value;
 154 };
 155
 156 #ifdef CONFIG_X86_64
 157 #  define COMPAT_TEST test_thread_flag(TIF_IA32)
 158 #elif defined(CONFIG_IA64)
 159 #  define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current))
 160 #elif defined(CONFIG_ARCH_S390)
 161 #  define COMPAT_TEST test_thread_flag(TIF_31BIT)
 162 #elif defined(CONFIG_MIPS)
 163 #  define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
 164 #else
 165 #  define COMPAT_TEST test_thread_flag(TIF_32BIT)
 166 #endif
 167
 168 static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 169 {
 170         struct evdev_list *list = file->private_data;
 171         struct input_event_compat event;
 172         int retval = 0;
 173
 174         while (retval < count) {
 175                 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat)))
 176                         return -EFAULT;
 177                 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
 178                 retval += sizeof(struct input_event_compat);
 179         }
 180
 181         return retval;
 182 }
 183 #endif
 184
 185 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 186 {
 187         struct evdev_list *list = file->private_data;
 188         struct input_event event;
 189         int retval = 0;
 190
 191         if (!list->evdev->exist) return -ENODEV;
 192
 193 #ifdef CONFIG_COMPAT
 194         if (COMPAT_TEST)
 195                 return evdev_write_compat(file, buffer, count, ppos);
 196 #endif
 197
 198         while (retval < count) {
 199
 200                 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
 201                         return -EFAULT;
 202                 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
 203                 retval += sizeof(struct input_event);
 204         }
 205
 206         return retval;
 207 }
 208
 209 #ifdef CONFIG_COMPAT
 210 static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 211 {
 212         struct evdev_list *list = file->private_data;
 213         int retval;
 214
 215         if (count < sizeof(struct input_event_compat))
 216                 return -EINVAL;
 217
 218         if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
 219                 return -EAGAIN;
 220
 221         retval = wait_event_interruptible(list->evdev->wait,
 222                 list->head != list->tail || (!list->evdev->exist));
 223
 224         if (retval)
 225                 return retval;
 226
 227         if (!list->evdev->exist)
 228                 return -ENODEV;
 229
 230         while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) {
 231                 struct input_event *event = (struct input_event *) list->buffer + list->tail;
 232                 struct input_event_compat event_compat;
 233                 event_compat.time.tv_sec = event->time.tv_sec;
 234                 event_compat.time.tv_usec = event->time.tv_usec;
 235                 event_compat.type = event->type;
 236                 event_compat.code = event->code;
 237                 event_compat.value = event->value;
 238
 239                 if (copy_to_user(buffer + retval, &event_compat,
 240                         sizeof(struct input_event_compat))) return -EFAULT;
 241                 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
 242                 retval += sizeof(struct input_event_compat);
 243         }
 244
 245         return retval;
 246 }
 247 #endif
 248
 249 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 250 {
 251         struct evdev_list *list = file->private_data;
 252         int retval;
 253
 254 #ifdef CONFIG_COMPAT
 255         if (COMPAT_TEST)
 256                 return evdev_read_compat(file, buffer, count, ppos);
 257 #endif
 258
 259         if (count < sizeof(struct input_event))
 260                 return -EINVAL;
 261
 262         if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
 263                 return -EAGAIN;
 264
 265         retval = wait_event_interruptible(list->evdev->wait,
 266                 list->head != list->tail || (!list->evdev->exist));
 267
 268         if (retval)
 269                 return retval;
 270
 271         if (!list->evdev->exist)
 272                 return -ENODEV;
 273
 274         while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
 275                 if (copy_to_user(buffer + retval, list->buffer + list->tail,
 276                         sizeof(struct input_event))) return -EFAULT;
 277                 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
 278                 retval += sizeof(struct input_event);
 279         }
 280
 281         return retval;
 282 }
 283
 284 /* No kernel lock - fine */
 285 static unsigned int evdev_poll(struct file *file, poll_table *wait)
 286 {
 287         struct evdev_list *list = file->private_data;
 288         poll_wait(file, &list->evdev->wait, wait);
 289         return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
 290                 (list->evdev->exist ? 0 : (POLLHUP | POLLERR));
 291 }
 292
 293 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 294 {
 295         struct evdev_list *list = file->private_data;
 296         struct evdev *evdev = list->evdev;
 297         struct input_dev *dev = evdev->handle.dev;
 298         struct input_absinfo abs;
 299         void __user *p = (void __user *)arg;
 300         int __user *ip = (int __user *)arg;
 301         int i, t, u, v;
 302
 303         if (!evdev->exist) return -ENODEV;
 304
 305         switch (cmd) {
 306
 307                 case EVIOCGVERSION:
 308                         return put_user(EV_VERSION, ip);
 309
 310                 case EVIOCGID:
 311                         return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0;
 312
 313                 case EVIOCGKEYCODE:
 314                         if (get_user(t, ip)) return -EFAULT;
 315                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
 316                         if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT;
 317                         return 0;
 318
 319                 case EVIOCSKEYCODE:
 320                         if (get_user(t, ip)) return -EFAULT;
 321                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
 322                         if (get_user(v, ip + 1)) return -EFAULT;
 323                         if (v < 0 || v > KEY_MAX) return -EINVAL;
 324                         if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8))) return -EINVAL;
 325                         u = SET_INPUT_KEYCODE(dev, t, v);
 326                         clear_bit(u, dev->keybit);
 327                         set_bit(v, dev->keybit);
 328                         for (i = 0; i < dev->keycodemax; i++)
 329                                 if (INPUT_KEYCODE(dev,i) == u)
 330                                         set_bit(u, dev->keybit);
 331                         return 0;
 332
 333                 case EVIOCSFF:
 334                         if (dev->upload_effect) {
 335                                 struct ff_effect effect;
 336                                 int err;
 337
 338                                 if (copy_from_user(&effect, p, sizeof(effect)))
 339                                         return -EFAULT;
 340                                 err = dev->upload_effect(dev, &effect);
 341                                 if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id)))
 342                                         return -EFAULT;
 343                                 return err;
 344                         }
 345                         else return -ENOSYS;
 346
 347                 case EVIOCRMFF:
 348                         if (dev->erase_effect) {
 349                                 return dev->erase_effect(dev, (int)arg);
 350                         }
 351                         else return -ENOSYS;
 352
 353                 case EVIOCGEFFECTS:
 354                         if (put_user(dev->ff_effects_max, ip))
 355                                 return -EFAULT;
 356                         return 0;
 357
 358                 case EVIOCGRAB:
 359                         if (arg) {
 360                                 if (evdev->grab)
 361                                         return -EBUSY;
 362                                 if (input_grab_device(&evdev->handle))
 363                                         return -EBUSY;
 364                                 evdev->grab = list;
 365                                 return 0;
 366                         } else {
 367                                 if (evdev->grab != list)
 368                                         return -EINVAL;
 369                                 input_release_device(&evdev->handle);
 370                                 evdev->grab = NULL;
 371                                 return 0;
 372                         }
 373
 374                 default:
 375
 376                         if (_IOC_TYPE(cmd) != 'E')
 377                                 return -EINVAL;
 378
 379                         if (_IOC_DIR(cmd) == _IOC_READ) {
 380
 381                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
 382
 383                                         long *bits;
 384                                         int len;
 385
 386                                         switch (_IOC_NR(cmd) & EV_MAX) {
 387                                                 case      0: bits = dev->evbit;  len = EV_MAX;  break;
 388                                                 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
 389                                                 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
 390                                                 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
 391                                                 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
 392                                                 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
 393                                                 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
 394                                                 case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
 395                                                 case EV_SW:  bits = dev->swbit;  len = SW_MAX;  break;
 396                                                 default: return -EINVAL;
 397                                         }
 398                                         len = NBITS(len) * sizeof(long);
 399                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 400                                         return copy_to_user(p, bits, len) ? -EFAULT : len;
 401                                 }
 402
 403                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
 404                                         int len;
 405                                         len = NBITS(KEY_MAX) * sizeof(long);
 406                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 407                                         return copy_to_user(p, dev->key, len) ? -EFAULT : len;
 408                                 }
 409
 410                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
 411                                         int len;
 412                                         len = NBITS(LED_MAX) * sizeof(long);
 413                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 414                                         return copy_to_user(p, dev->led, len) ? -EFAULT : len;
 415                                 }
 416
 417                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
 418                                         int len;
 419                                         len = NBITS(SND_MAX) * sizeof(long);
 420                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 421                                         return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
 422                                 }
 423
 424                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) {
 425                                         int len;
 426                                         len = NBITS(SW_MAX) * sizeof(long);
 427                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 428                                         return copy_to_user(p, dev->sw, len) ? -EFAULT : len;
 429                                 }
 430
 431                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
 432                                         int len;
 433                                         if (!dev->name) return -ENOENT;
 434                                         len = strlen(dev->name) + 1;
 435                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 436                                         return copy_to_user(p, dev->name, len) ? -EFAULT : len;
 437                                 }
 438
 439                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
 440                                         int len;
 441                                         if (!dev->phys) return -ENOENT;
 442                                         len = strlen(dev->phys) + 1;
 443                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 444                                         return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
 445                                 }
 446
 447                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
 448                                         int len;
 449                                         if (!dev->uniq) return -ENOENT;
 450                                         len = strlen(dev->uniq) + 1;
 451                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 452                                         return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
 453                                 }
 454
 455                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
 456
 457                                         int t = _IOC_NR(cmd) & ABS_MAX;
 458
 459                                         abs.value = dev->abs[t];
 460                                         abs.minimum = dev->absmin[t];
 461                                         abs.maximum = dev->absmax[t];
 462                                         abs.fuzz = dev->absfuzz[t];
 463                                         abs.flat = dev->absflat[t];
 464
 465                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
 466                                                 return -EFAULT;
 467
 468                                         return 0;
 469                                 }
 470
 471                         }
 472
 473                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
 474
 475                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
 476
 477                                         int t = _IOC_NR(cmd) & ABS_MAX;
 478
 479                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
 480                                                 return -EFAULT;
 481
 482                                         dev->abs[t] = abs.value;
 483                                         dev->absmin[t] = abs.minimum;
 484                                         dev->absmax[t] = abs.maximum;
 485                                         dev->absfuzz[t] = abs.fuzz;
 486                                         dev->absflat[t] = abs.flat;
 487
 488                                         return 0;
 489                                 }
 490                         }
 491         }
 492         return -EINVAL;
 493 }
 494
 495 #ifdef CONFIG_COMPAT
 496
 497 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
 498 #define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1)
 499 #define OFF_COMPAT(x)  ((x)%BITS_PER_LONG_COMPAT)
 500 #define BIT_COMPAT(x)  (1UL<<OFF_COMPAT(x))
 501 #define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT)
 502 #define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1)
 503
 504 #ifdef __BIG_ENDIAN
 505 #define bit_to_user(bit, max) \
 506 do { \
 507         int i; \
 508         int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
 509         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
 510         for (i = 0; i < len / sizeof(compat_long_t); i++) \
 511                 if (copy_to_user((compat_long_t __user *) p + i, \
 512                                  (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \
 513                                  sizeof(compat_long_t))) \
 514                         return -EFAULT; \
 515         return len; \
 516 } while (0)
 517 #else
 518 #define bit_to_user(bit, max) \
 519 do { \
 520         int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
 521         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
 522         return copy_to_user(p, (bit), len) ? -EFAULT : len; \
 523 } while (0)
 524 #endif
 525
 526 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 527 {
 528         struct evdev_list *list = file->private_data;
 529         struct evdev *evdev = list->evdev;
 530         struct input_dev *dev = evdev->handle.dev;
 531         struct input_absinfo abs;
 532         void __user *p = compat_ptr(arg);
 533
 534         if (!evdev->exist) return -ENODEV;
 535
 536         switch (cmd) {
 537
 538                 case EVIOCGVERSION:
 539                 case EVIOCGID:
 540                 case EVIOCGKEYCODE:
 541                 case EVIOCSKEYCODE:
 542                 case EVIOCSFF:
 543                 case EVIOCRMFF:
 544                 case EVIOCGEFFECTS:
 545                 case EVIOCGRAB:
 546                         return evdev_ioctl(file, cmd, (unsigned long) p);
 547
 548                 default:
 549
 550                         if (_IOC_TYPE(cmd) != 'E')
 551                                 return -EINVAL;
 552
 553                         if (_IOC_DIR(cmd) == _IOC_READ) {
 554
 555                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
 556                                         long *bits;
 557                                         int max;
 558
 559                                         switch (_IOC_NR(cmd) & EV_MAX) {
 560                                                 case      0: bits = dev->evbit;  max = EV_MAX;  break;
 561                                                 case EV_KEY: bits = dev->keybit; max = KEY_MAX; break;
 562                                                 case EV_REL: bits = dev->relbit; max = REL_MAX; break;
 563                                                 case EV_ABS: bits = dev->absbit; max = ABS_MAX; break;
 564                                                 case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break;
 565                                                 case EV_LED: bits = dev->ledbit; max = LED_MAX; break;
 566                                                 case EV_SND: bits = dev->sndbit; max = SND_MAX; break;
 567                                                 case EV_FF:  bits = dev->ffbit;  max = FF_MAX;  break;
 568                                                 default: return -EINVAL;
 569                                         }
 570                                         bit_to_user(bits, max);
 571                                 }
 572
 573                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
 574                                         bit_to_user(dev->key, KEY_MAX);
 575
 576                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
 577                                         bit_to_user(dev->led, LED_MAX);
 578
 579                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
 580                                         bit_to_user(dev->snd, SND_MAX);
 581
 582                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
 583                                         int len;
 584                                         if (!dev->name) return -ENOENT;
 585                                         len = strlen(dev->name) + 1;
 586                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 587                                         return copy_to_user(p, dev->name, len) ? -EFAULT : len;
 588                                 }
 589
 590                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
 591                                         int len;
 592                                         if (!dev->phys) return -ENOENT;
 593                                         len = strlen(dev->phys) + 1;
 594                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 595                                         return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
 596                                 }
 597
 598                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
 599                                         int len;
 600                                         if (!dev->uniq) return -ENOENT;
 601                                         len = strlen(dev->uniq) + 1;
 602                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 603                                         return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
 604                                 }
 605
 606                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
 607
 608                                         int t = _IOC_NR(cmd) & ABS_MAX;
 609
 610                                         abs.value = dev->abs[t];
 611                                         abs.minimum = dev->absmin[t];
 612                                         abs.maximum = dev->absmax[t];
 613                                         abs.fuzz = dev->absfuzz[t];
 614                                         abs.flat = dev->absflat[t];
 615
 616                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
 617                                                 return -EFAULT;
 618
 619                                         return 0;
 620                                 }
 621                         }
 622
 623                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
 624
 625                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
 626
 627                                         int t = _IOC_NR(cmd) & ABS_MAX;
 628
 629                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
 630                                                 return -EFAULT;
 631
 632                                         dev->abs[t] = abs.value;
 633                                         dev->absmin[t] = abs.minimum;
 634                                         dev->absmax[t] = abs.maximum;
 635                                         dev->absfuzz[t] = abs.fuzz;
 636                                         dev->absflat[t] = abs.flat;
 637
 638                                         return 0;
 639                                 }
 640                         }
 641         }
 642         return -EINVAL;
 643 }
 644 #endif
 645
 646 static struct file_operations evdev_fops = {
 647         .owner =        THIS_MODULE,
 648         .read =         evdev_read,
 649         .write =        evdev_write,
 650         .poll =         evdev_poll,
 651         .open =         evdev_open,
 652         .release =      evdev_release,
 653         .unlocked_ioctl = evdev_ioctl,
 654 #ifdef CONFIG_COMPAT
 655         .compat_ioctl = evdev_ioctl_compat,
 656 #endif
 657         .fasync =       evdev_fasync,
 658         .flush =        evdev_flush
 659 };
 660
 661 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 662 {
 663         struct evdev *evdev;
 664         struct class_device *cdev;
 665         int minor;
 666
 667         for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
 668         if (minor == EVDEV_MINORS) {
 669                 printk(KERN_ERR "evdev: no more free evdev devices\n");
 670                 return NULL;
 671         }
 672
 673         if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
 674                 return NULL;
 675         memset(evdev, 0, sizeof(struct evdev));
 676
 677         INIT_LIST_HEAD(&evdev->list);
 678         init_waitqueue_head(&evdev->wait);
 679
 680         evdev->exist = 1;
 681         evdev->minor = minor;
 682         evdev->handle.dev = dev;
 683         evdev->handle.name = evdev->name;
 684         evdev->handle.handler = handler;
 685         evdev->handle.private = evdev;
 686         sprintf(evdev->name, "event%d", minor);
 687
 688         evdev_table[minor] = evdev;
 689
 690         cdev = class_device_create(&input_class, &dev->cdev,
 691                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
 692                         dev->cdev.dev, evdev->name);
 693
 694         /* temporary symlink to keep userspace happy */
 695         sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
 696                           evdev->name);
 697
 698         return &evdev->handle;
 699 }
 700
 701 static void evdev_disconnect(struct input_handle *handle)
 702 {
 703         struct evdev *evdev = handle->private;
 704         struct evdev_list *list;
 705
 706         sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
 707         class_device_destroy(&input_class,
 708                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
 709         evdev->exist = 0;
 710
 711         if (evdev->open) {
 712                 input_close_device(handle);
 713                 wake_up_interruptible(&evdev->wait);
 714                 list_for_each_entry(list, &evdev->list, node)
 715                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 716         } else
 717                 evdev_free(evdev);
 718 }
 719
 720 static struct input_device_id evdev_ids[] = {
 721         { .driver_info = 1 },   /* Matches all devices */
 722         { },                    /* Terminating zero entry */
 723 };
 724
 725 MODULE_DEVICE_TABLE(input, evdev_ids);
 726
 727 static struct input_handler evdev_handler = {
 728         .event =        evdev_event,
 729         .connect =      evdev_connect,
 730         .disconnect =   evdev_disconnect,
 731         .fops =         &evdev_fops,
 732         .minor =        EVDEV_MINOR_BASE,
 733         .name =         "evdev",
 734         .id_table =     evdev_ids,
 735 };
 736
 737 static int __init evdev_init(void)
 738 {
 739         input_register_handler(&evdev_handler);
 740         return 0;
 741 }
 742
 743 static void __exit evdev_exit(void)
 744 {
 745         input_unregister_handler(&evdev_handler);
 746 }
 747
 748 module_init(evdev_init);
 749 module_exit(evdev_exit);
 750
 751 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 752 MODULE_DESCRIPTION("Input driver event char devices");
 753 MODULE_LICENSE("GPL");