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 #else
 164 #  define COMPAT_TEST test_thread_flag(TIF_32BIT)
 165 #endif
 166
 167 static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 168 {
 169         struct evdev_list *list = file->private_data;
 170         struct input_event_compat event;
 171         int retval = 0;
 172
 173         while (retval < count) {
 174                 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat)))
 175                         return -EFAULT;
 176                 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
 177                 retval += sizeof(struct input_event_compat);
 178         }
 179
 180         return retval;
 181 }
 182 #endif
 183
 184 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 185 {
 186         struct evdev_list *list = file->private_data;
 187         struct input_event event;
 188         int retval = 0;
 189
 190         if (!list->evdev->exist) return -ENODEV;
 191
 192 #ifdef CONFIG_COMPAT
 193         if (COMPAT_TEST)
 194                 return evdev_write_compat(file, buffer, count, ppos);
 195 #endif
 196
 197         while (retval < count) {
 198
 199                 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
 200                         return -EFAULT;
 201                 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
 202                 retval += sizeof(struct input_event);
 203         }
 204
 205         return retval;
 206 }
 207
 208 #ifdef CONFIG_COMPAT
 209 static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 210 {
 211         struct evdev_list *list = file->private_data;
 212         int retval;
 213
 214         if (count < sizeof(struct input_event_compat))
 215                 return -EINVAL;
 216
 217         if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
 218                 return -EAGAIN;
 219
 220         retval = wait_event_interruptible(list->evdev->wait,
 221                 list->head != list->tail || (!list->evdev->exist));
 222
 223         if (retval)
 224                 return retval;
 225
 226         if (!list->evdev->exist)
 227                 return -ENODEV;
 228
 229         while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) {
 230                 struct input_event *event = (struct input_event *) list->buffer + list->tail;
 231                 struct input_event_compat event_compat;
 232                 event_compat.time.tv_sec = event->time.tv_sec;
 233                 event_compat.time.tv_usec = event->time.tv_usec;
 234                 event_compat.type = event->type;
 235                 event_compat.code = event->code;
 236                 event_compat.value = event->value;
 237
 238                 if (copy_to_user(buffer + retval, &event_compat,
 239                         sizeof(struct input_event_compat))) return -EFAULT;
 240                 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
 241                 retval += sizeof(struct input_event_compat);
 242         }
 243
 244         return retval;
 245 }
 246 #endif
 247
 248 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 249 {
 250         struct evdev_list *list = file->private_data;
 251         int retval;
 252
 253 #ifdef CONFIG_COMPAT
 254         if (COMPAT_TEST)
 255                 return evdev_read_compat(file, buffer, count, ppos);
 256 #endif
 257
 258         if (count < sizeof(struct input_event))
 259                 return -EINVAL;
 260
 261         if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
 262                 return -EAGAIN;
 263
 264         retval = wait_event_interruptible(list->evdev->wait,
 265                 list->head != list->tail || (!list->evdev->exist));
 266
 267         if (retval)
 268                 return retval;
 269
 270         if (!list->evdev->exist)
 271                 return -ENODEV;
 272
 273         while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
 274                 if (copy_to_user(buffer + retval, list->buffer + list->tail,
 275                         sizeof(struct input_event))) return -EFAULT;
 276                 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
 277                 retval += sizeof(struct input_event);
 278         }
 279
 280         return retval;
 281 }
 282
 283 /* No kernel lock - fine */
 284 static unsigned int evdev_poll(struct file *file, poll_table *wait)
 285 {
 286         struct evdev_list *list = file->private_data;
 287         poll_wait(file, &list->evdev->wait, wait);
 288         return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
 289                 (list->evdev->exist ? 0 : (POLLHUP | POLLERR));
 290 }
 291
 292 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 293 {
 294         struct evdev_list *list = file->private_data;
 295         struct evdev *evdev = list->evdev;
 296         struct input_dev *dev = evdev->handle.dev;
 297         struct input_absinfo abs;
 298         void __user *p = (void __user *)arg;
 299         int __user *ip = (int __user *)arg;
 300         int i, t, u, v;
 301
 302         if (!evdev->exist) return -ENODEV;
 303
 304         switch (cmd) {
 305
 306                 case EVIOCGVERSION:
 307                         return put_user(EV_VERSION, ip);
 308
 309                 case EVIOCGID:
 310                         return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0;
 311
 312                 case EVIOCGKEYCODE:
 313                         if (get_user(t, ip)) return -EFAULT;
 314                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
 315                         if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT;
 316                         return 0;
 317
 318                 case EVIOCSKEYCODE:
 319                         if (get_user(t, ip)) return -EFAULT;
 320                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
 321                         if (get_user(v, ip + 1)) return -EFAULT;
 322                         if (v < 0 || v > KEY_MAX) return -EINVAL;
 323                         if (v >> (dev->keycodesize * 8)) return -EINVAL;
 324                         u = SET_INPUT_KEYCODE(dev, t, v);
 325                         clear_bit(u, dev->keybit);
 326                         set_bit(v, dev->keybit);
 327                         for (i = 0; i < dev->keycodemax; i++)
 328                                 if (INPUT_KEYCODE(dev,i) == u)
 329                                         set_bit(u, dev->keybit);
 330                         return 0;
 331
 332                 case EVIOCSFF:
 333                         if (dev->upload_effect) {
 334                                 struct ff_effect effect;
 335                                 int err;
 336
 337                                 if (copy_from_user(&effect, p, sizeof(effect)))
 338                                         return -EFAULT;
 339                                 err = dev->upload_effect(dev, &effect);
 340                                 if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id)))
 341                                         return -EFAULT;
 342                                 return err;
 343                         }
 344                         else return -ENOSYS;
 345
 346                 case EVIOCRMFF:
 347                         if (dev->erase_effect) {
 348                                 return dev->erase_effect(dev, (int)arg);
 349                         }
 350                         else return -ENOSYS;
 351
 352                 case EVIOCGEFFECTS:
 353                         if (put_user(dev->ff_effects_max, ip))
 354                                 return -EFAULT;
 355                         return 0;
 356
 357                 case EVIOCGRAB:
 358                         if (arg) {
 359                                 if (evdev->grab)
 360                                         return -EBUSY;
 361                                 if (input_grab_device(&evdev->handle))
 362                                         return -EBUSY;
 363                                 evdev->grab = list;
 364                                 return 0;
 365                         } else {
 366                                 if (evdev->grab != list)
 367                                         return -EINVAL;
 368                                 input_release_device(&evdev->handle);
 369                                 evdev->grab = NULL;
 370                                 return 0;
 371                         }
 372
 373                 default:
 374
 375                         if (_IOC_TYPE(cmd) != 'E')
 376                                 return -EINVAL;
 377
 378                         if (_IOC_DIR(cmd) == _IOC_READ) {
 379
 380                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
 381
 382                                         long *bits;
 383                                         int len;
 384
 385                                         switch (_IOC_NR(cmd) & EV_MAX) {
 386                                                 case      0: bits = dev->evbit;  len = EV_MAX;  break;
 387                                                 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
 388                                                 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
 389                                                 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
 390                                                 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
 391                                                 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
 392                                                 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
 393                                                 case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
 394                                                 default: return -EINVAL;
 395                                         }
 396                                         len = NBITS(len) * sizeof(long);
 397                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 398                                         return copy_to_user(p, bits, len) ? -EFAULT : len;
 399                                 }
 400
 401                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
 402                                         int len;
 403                                         len = NBITS(KEY_MAX) * sizeof(long);
 404                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 405                                         return copy_to_user(p, dev->key, len) ? -EFAULT : len;
 406                                 }
 407
 408                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
 409                                         int len;
 410                                         len = NBITS(LED_MAX) * sizeof(long);
 411                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 412                                         return copy_to_user(p, dev->led, len) ? -EFAULT : len;
 413                                 }
 414
 415                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
 416                                         int len;
 417                                         len = NBITS(SND_MAX) * sizeof(long);
 418                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 419                                         return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
 420                                 }
 421
 422                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
 423                                         int len;
 424                                         if (!dev->name) return -ENOENT;
 425                                         len = strlen(dev->name) + 1;
 426                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 427                                         return copy_to_user(p, dev->name, len) ? -EFAULT : len;
 428                                 }
 429
 430                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
 431                                         int len;
 432                                         if (!dev->phys) return -ENOENT;
 433                                         len = strlen(dev->phys) + 1;
 434                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 435                                         return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
 436                                 }
 437
 438                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
 439                                         int len;
 440                                         if (!dev->uniq) return -ENOENT;
 441                                         len = strlen(dev->uniq) + 1;
 442                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 443                                         return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
 444                                 }
 445
 446                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
 447
 448                                         int t = _IOC_NR(cmd) & ABS_MAX;
 449
 450                                         abs.value = dev->abs[t];
 451                                         abs.minimum = dev->absmin[t];
 452                                         abs.maximum = dev->absmax[t];
 453                                         abs.fuzz = dev->absfuzz[t];
 454                                         abs.flat = dev->absflat[t];
 455
 456                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
 457                                                 return -EFAULT;
 458
 459                                         return 0;
 460                                 }
 461
 462                         }
 463
 464                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
 465
 466                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
 467
 468                                         int t = _IOC_NR(cmd) & ABS_MAX;
 469
 470                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
 471                                                 return -EFAULT;
 472
 473                                         dev->abs[t] = abs.value;
 474                                         dev->absmin[t] = abs.minimum;
 475                                         dev->absmax[t] = abs.maximum;
 476                                         dev->absfuzz[t] = abs.fuzz;
 477                                         dev->absflat[t] = abs.flat;
 478
 479                                         return 0;
 480                                 }
 481                         }
 482         }
 483         return -EINVAL;
 484 }
 485
 486 #ifdef CONFIG_COMPAT
 487
 488 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
 489 #define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1)
 490 #define OFF_COMPAT(x)  ((x)%BITS_PER_LONG_COMPAT)
 491 #define BIT_COMPAT(x)  (1UL<<OFF_COMPAT(x))
 492 #define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT)
 493 #define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1)
 494
 495 #ifdef __BIG_ENDIAN
 496 #define bit_to_user(bit, max) \
 497 do { \
 498         int i; \
 499         int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
 500         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
 501         for (i = 0; i < len / sizeof(compat_long_t); i++) \
 502                 if (copy_to_user((compat_long_t*) p + i, \
 503                                  (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \
 504                                  sizeof(compat_long_t))) \
 505                         return -EFAULT; \
 506         return len; \
 507 } while (0)
 508 #else
 509 #define bit_to_user(bit, max) \
 510 do { \
 511         int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
 512         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
 513         return copy_to_user(p, (bit), len) ? -EFAULT : len; \
 514 } while (0)
 515 #endif
 516
 517 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 518 {
 519         struct evdev_list *list = file->private_data;
 520         struct evdev *evdev = list->evdev;
 521         struct input_dev *dev = evdev->handle.dev;
 522         struct input_absinfo abs;
 523         void __user *p = compat_ptr(arg);
 524
 525         if (!evdev->exist) return -ENODEV;
 526
 527         switch (cmd) {
 528
 529                 case EVIOCGVERSION:
 530                 case EVIOCGID:
 531                 case EVIOCGKEYCODE:
 532                 case EVIOCSKEYCODE:
 533                 case EVIOCSFF:
 534                 case EVIOCRMFF:
 535                 case EVIOCGEFFECTS:
 536                 case EVIOCGRAB:
 537                         return evdev_ioctl(file, cmd, (unsigned long) p);
 538
 539                 default:
 540
 541                         if (_IOC_TYPE(cmd) != 'E')
 542                                 return -EINVAL;
 543
 544                         if (_IOC_DIR(cmd) == _IOC_READ) {
 545
 546                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
 547                                         long *bits;
 548                                         int max;
 549
 550                                         switch (_IOC_NR(cmd) & EV_MAX) {
 551                                                 case      0: bits = dev->evbit;  max = EV_MAX;  break;
 552                                                 case EV_KEY: bits = dev->keybit; max = KEY_MAX; break;
 553                                                 case EV_REL: bits = dev->relbit; max = REL_MAX; break;
 554                                                 case EV_ABS: bits = dev->absbit; max = ABS_MAX; break;
 555                                                 case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break;
 556                                                 case EV_LED: bits = dev->ledbit; max = LED_MAX; break;
 557                                                 case EV_SND: bits = dev->sndbit; max = SND_MAX; break;
 558                                                 case EV_FF:  bits = dev->ffbit;  max = FF_MAX;  break;
 559                                                 default: return -EINVAL;
 560                                         }
 561                                         bit_to_user(bits, max);
 562                                 }
 563
 564                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
 565                                         bit_to_user(dev->key, KEY_MAX);
 566
 567                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
 568                                         bit_to_user(dev->led, LED_MAX);
 569
 570                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
 571                                         bit_to_user(dev->snd, SND_MAX);
 572
 573                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
 574                                         int len;
 575                                         if (!dev->name) return -ENOENT;
 576                                         len = strlen(dev->name) + 1;
 577                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 578                                         return copy_to_user(p, dev->name, len) ? -EFAULT : len;
 579                                 }
 580
 581                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
 582                                         int len;
 583                                         if (!dev->phys) return -ENOENT;
 584                                         len = strlen(dev->phys) + 1;
 585                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 586                                         return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
 587                                 }
 588
 589                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
 590                                         int len;
 591                                         if (!dev->uniq) return -ENOENT;
 592                                         len = strlen(dev->uniq) + 1;
 593                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 594                                         return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
 595                                 }
 596
 597                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
 598
 599                                         int t = _IOC_NR(cmd) & ABS_MAX;
 600
 601                                         abs.value = dev->abs[t];
 602                                         abs.minimum = dev->absmin[t];
 603                                         abs.maximum = dev->absmax[t];
 604                                         abs.fuzz = dev->absfuzz[t];
 605                                         abs.flat = dev->absflat[t];
 606
 607                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
 608                                                 return -EFAULT;
 609
 610                                         return 0;
 611                                 }
 612                         }
 613
 614                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
 615
 616                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
 617
 618                                         int t = _IOC_NR(cmd) & ABS_MAX;
 619
 620                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
 621                                                 return -EFAULT;
 622
 623                                         dev->abs[t] = abs.value;
 624                                         dev->absmin[t] = abs.minimum;
 625                                         dev->absmax[t] = abs.maximum;
 626                                         dev->absfuzz[t] = abs.fuzz;
 627                                         dev->absflat[t] = abs.flat;
 628
 629                                         return 0;
 630                                 }
 631                         }
 632         }
 633         return -EINVAL;
 634 }
 635 #endif
 636
 637 static struct file_operations evdev_fops = {
 638         .owner =        THIS_MODULE,
 639         .read =         evdev_read,
 640         .write =        evdev_write,
 641         .poll =         evdev_poll,
 642         .open =         evdev_open,
 643         .release =      evdev_release,
 644         .unlocked_ioctl = evdev_ioctl,
 645 #ifdef CONFIG_COMPAT
 646         .compat_ioctl = evdev_ioctl_compat,
 647 #endif
 648         .fasync =       evdev_fasync,
 649         .flush =        evdev_flush
 650 };
 651
 652 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 653 {
 654         struct evdev *evdev;
 655         int minor;
 656
 657         for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
 658         if (minor == EVDEV_MINORS) {
 659                 printk(KERN_ERR "evdev: no more free evdev devices\n");
 660                 return NULL;
 661         }
 662
 663         if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
 664                 return NULL;
 665         memset(evdev, 0, sizeof(struct evdev));
 666
 667         INIT_LIST_HEAD(&evdev->list);
 668         init_waitqueue_head(&evdev->wait);
 669
 670         evdev->exist = 1;
 671         evdev->minor = minor;
 672         evdev->handle.dev = dev;
 673         evdev->handle.name = evdev->name;
 674         evdev->handle.handler = handler;
 675         evdev->handle.private = evdev;
 676         sprintf(evdev->name, "event%d", minor);
 677
 678         evdev_table[minor] = evdev;
 679
 680         devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
 681                         S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor);
 682         class_device_create(input_class,
 683                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
 684                         dev->dev, "event%d", minor);
 685
 686         return &evdev->handle;
 687 }
 688
 689 static void evdev_disconnect(struct input_handle *handle)
 690 {
 691         struct evdev *evdev = handle->private;
 692         struct evdev_list *list;
 693
 694         class_device_destroy(input_class,
 695                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
 696         devfs_remove("input/event%d", evdev->minor);
 697         evdev->exist = 0;
 698
 699         if (evdev->open) {
 700                 input_close_device(handle);
 701                 wake_up_interruptible(&evdev->wait);
 702                 list_for_each_entry(list, &evdev->list, node)
 703                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 704         } else
 705                 evdev_free(evdev);
 706 }
 707
 708 static struct input_device_id evdev_ids[] = {
 709         { .driver_info = 1 },   /* Matches all devices */
 710         { },                    /* Terminating zero entry */
 711 };
 712
 713 MODULE_DEVICE_TABLE(input, evdev_ids);
 714
 715 static struct input_handler evdev_handler = {
 716         .event =        evdev_event,
 717         .connect =      evdev_connect,
 718         .disconnect =   evdev_disconnect,
 719         .fops =         &evdev_fops,
 720         .minor =        EVDEV_MINOR_BASE,
 721         .name =         "evdev",
 722         .id_table =     evdev_ids,
 723 };
 724
 725 static int __init evdev_init(void)
 726 {
 727         input_register_handler(&evdev_handler);
 728         return 0;
 729 }
 730
 731 static void __exit evdev_exit(void)
 732 {
 733         input_unregister_handler(&evdev_handler);
 734 }
 735
 736 module_init(evdev_init);
 737 module_exit(evdev_exit);
 738
 739 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 740 MODULE_DESCRIPTION("Input driver event char devices");
 741 MODULE_LICENSE("GPL");