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