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 u = SET_INPUT_KEYCODE(dev, t, v); 324 clear_bit(u, dev->keybit); 325 set_bit(v, dev->keybit); 326 for (i = 0; i < dev->keycodemax; i++) 327 if (INPUT_KEYCODE(dev,i) == u) 328 set_bit(u, dev->keybit); 329 return 0; 330 331 case EVIOCSFF: 332 if (dev->upload_effect) { 333 struct ff_effect effect; 334 int err; 335 336 if (copy_from_user(&effect, p, sizeof(effect))) 337 return -EFAULT; 338 err = dev->upload_effect(dev, &effect); 339 if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id))) 340 return -EFAULT; 341 return err; 342 } 343 else return -ENOSYS; 344 345 case EVIOCRMFF: 346 if (dev->erase_effect) { 347 return dev->erase_effect(dev, (int)arg); 348 } 349 else return -ENOSYS; 350 351 case EVIOCGEFFECTS: 352 if (put_user(dev->ff_effects_max, ip)) 353 return -EFAULT; 354 return 0; 355 356 case EVIOCGRAB: 357 if (arg) { 358 if (evdev->grab) 359 return -EBUSY; 360 if (input_grab_device(&evdev->handle)) 361 return -EBUSY; 362 evdev->grab = list; 363 return 0; 364 } else { 365 if (evdev->grab != list) 366 return -EINVAL; 367 input_release_device(&evdev->handle); 368 evdev->grab = NULL; 369 return 0; 370 } 371 372 default: 373 374 if (_IOC_TYPE(cmd) != 'E') 375 return -EINVAL; 376 377 if (_IOC_DIR(cmd) == _IOC_READ) { 378 379 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { 380 381 long *bits; 382 int len; 383 384 switch (_IOC_NR(cmd) & EV_MAX) { 385 case 0: bits = dev->evbit; len = EV_MAX; break; 386 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; 387 case EV_REL: bits = dev->relbit; len = REL_MAX; break; 388 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; 389 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; 390 case EV_LED: bits = dev->ledbit; len = LED_MAX; break; 391 case EV_SND: bits = dev->sndbit; len = SND_MAX; break; 392 case EV_FF: bits = dev->ffbit; len = FF_MAX; break; 393 default: return -EINVAL; 394 } 395 len = NBITS(len) * sizeof(long); 396 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 397 return copy_to_user(p, bits, len) ? -EFAULT : len; 398 } 399 400 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) { 401 int len; 402 len = NBITS(KEY_MAX) * sizeof(long); 403 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 404 return copy_to_user(p, dev->key, len) ? -EFAULT : len; 405 } 406 407 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) { 408 int len; 409 len = NBITS(LED_MAX) * sizeof(long); 410 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 411 return copy_to_user(p, dev->led, len) ? -EFAULT : len; 412 } 413 414 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) { 415 int len; 416 len = NBITS(SND_MAX) * sizeof(long); 417 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 418 return copy_to_user(p, dev->snd, len) ? -EFAULT : len; 419 } 420 421 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { 422 int len; 423 if (!dev->name) return -ENOENT; 424 len = strlen(dev->name) + 1; 425 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 426 return copy_to_user(p, dev->name, len) ? -EFAULT : len; 427 } 428 429 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) { 430 int len; 431 if (!dev->phys) return -ENOENT; 432 len = strlen(dev->phys) + 1; 433 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 434 return copy_to_user(p, dev->phys, len) ? -EFAULT : len; 435 } 436 437 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { 438 int len; 439 if (!dev->uniq) return -ENOENT; 440 len = strlen(dev->uniq) + 1; 441 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 442 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len; 443 } 444 445 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { 446 447 int t = _IOC_NR(cmd) & ABS_MAX; 448 449 abs.value = dev->abs[t]; 450 abs.minimum = dev->absmin[t]; 451 abs.maximum = dev->absmax[t]; 452 abs.fuzz = dev->absfuzz[t]; 453 abs.flat = dev->absflat[t]; 454 455 if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) 456 return -EFAULT; 457 458 return 0; 459 } 460 461 } 462 463 if (_IOC_DIR(cmd) == _IOC_WRITE) { 464 465 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { 466 467 int t = _IOC_NR(cmd) & ABS_MAX; 468 469 if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) 470 return -EFAULT; 471 472 dev->abs[t] = abs.value; 473 dev->absmin[t] = abs.minimum; 474 dev->absmax[t] = abs.maximum; 475 dev->absfuzz[t] = abs.fuzz; 476 dev->absflat[t] = abs.flat; 477 478 return 0; 479 } 480 } 481 } 482 return -EINVAL; 483 } 484 485 #ifdef CONFIG_COMPAT 486 487 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) 488 #define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1) 489 #define OFF_COMPAT(x) ((x)%BITS_PER_LONG_COMPAT) 490 #define BIT_COMPAT(x) (1UL<<OFF_COMPAT(x)) 491 #define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT) 492 #define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1) 493 494 #ifdef __BIG_ENDIAN 495 #define bit_to_user(bit, max) \ 496 do { \ 497 int i; \ 498 int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \ 499 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \ 500 for (i = 0; i < len / sizeof(compat_long_t); i++) \ 501 if (copy_to_user((compat_long_t*) p + i, \ 502 (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \ 503 sizeof(compat_long_t))) \ 504 return -EFAULT; \ 505 return len; \ 506 } while (0) 507 #else 508 #define bit_to_user(bit, max) \ 509 do { \ 510 int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \ 511 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \ 512 return copy_to_user(p, (bit), len) ? -EFAULT : len; \ 513 } while (0) 514 #endif 515 516 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) 517 { 518 struct evdev_list *list = file->private_data; 519 struct evdev *evdev = list->evdev; 520 struct input_dev *dev = evdev->handle.dev; 521 struct input_absinfo abs; 522 void __user *p = compat_ptr(arg); 523 524 if (!evdev->exist) return -ENODEV; 525 526 switch (cmd) { 527 528 case EVIOCGVERSION: 529 case EVIOCGID: 530 case EVIOCGKEYCODE: 531 case EVIOCSKEYCODE: 532 case EVIOCSFF: 533 case EVIOCRMFF: 534 case EVIOCGEFFECTS: 535 case EVIOCGRAB: 536 return evdev_ioctl(file, cmd, (unsigned long) p); 537 538 default: 539 540 if (_IOC_TYPE(cmd) != 'E') 541 return -EINVAL; 542 543 if (_IOC_DIR(cmd) == _IOC_READ) { 544 545 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { 546 long *bits; 547 int max; 548 549 switch (_IOC_NR(cmd) & EV_MAX) { 550 case 0: bits = dev->evbit; max = EV_MAX; break; 551 case EV_KEY: bits = dev->keybit; max = KEY_MAX; break; 552 case EV_REL: bits = dev->relbit; max = REL_MAX; break; 553 case EV_ABS: bits = dev->absbit; max = ABS_MAX; break; 554 case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break; 555 case EV_LED: bits = dev->ledbit; max = LED_MAX; break; 556 case EV_SND: bits = dev->sndbit; max = SND_MAX; break; 557 case EV_FF: bits = dev->ffbit; max = FF_MAX; break; 558 default: return -EINVAL; 559 } 560 bit_to_user(bits, max); 561 } 562 563 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) 564 bit_to_user(dev->key, KEY_MAX); 565 566 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) 567 bit_to_user(dev->led, LED_MAX); 568 569 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) 570 bit_to_user(dev->snd, SND_MAX); 571 572 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { 573 int len; 574 if (!dev->name) return -ENOENT; 575 len = strlen(dev->name) + 1; 576 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 577 return copy_to_user(p, dev->name, len) ? -EFAULT : len; 578 } 579 580 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) { 581 int len; 582 if (!dev->phys) return -ENOENT; 583 len = strlen(dev->phys) + 1; 584 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 585 return copy_to_user(p, dev->phys, len) ? -EFAULT : len; 586 } 587 588 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { 589 int len; 590 if (!dev->uniq) return -ENOENT; 591 len = strlen(dev->uniq) + 1; 592 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 593 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len; 594 } 595 596 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { 597 598 int t = _IOC_NR(cmd) & ABS_MAX; 599 600 abs.value = dev->abs[t]; 601 abs.minimum = dev->absmin[t]; 602 abs.maximum = dev->absmax[t]; 603 abs.fuzz = dev->absfuzz[t]; 604 abs.flat = dev->absflat[t]; 605 606 if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) 607 return -EFAULT; 608 609 return 0; 610 } 611 } 612 613 if (_IOC_DIR(cmd) == _IOC_WRITE) { 614 615 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { 616 617 int t = _IOC_NR(cmd) & ABS_MAX; 618 619 if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) 620 return -EFAULT; 621 622 dev->abs[t] = abs.value; 623 dev->absmin[t] = abs.minimum; 624 dev->absmax[t] = abs.maximum; 625 dev->absfuzz[t] = abs.fuzz; 626 dev->absflat[t] = abs.flat; 627 628 return 0; 629 } 630 } 631 } 632 return -EINVAL; 633 } 634 #endif 635 636 static struct file_operations evdev_fops = { 637 .owner = THIS_MODULE, 638 .read = evdev_read, 639 .write = evdev_write, 640 .poll = evdev_poll, 641 .open = evdev_open, 642 .release = evdev_release, 643 .unlocked_ioctl = evdev_ioctl, 644 #ifdef CONFIG_COMPAT 645 .compat_ioctl = evdev_ioctl_compat, 646 #endif 647 .fasync = evdev_fasync, 648 .flush = evdev_flush 649 }; 650 651 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) 652 { 653 struct evdev *evdev; 654 int minor; 655 656 for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++); 657 if (minor == EVDEV_MINORS) { 658 printk(KERN_ERR "evdev: no more free evdev devices\n"); 659 return NULL; 660 } 661 662 if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL))) 663 return NULL; 664 memset(evdev, 0, sizeof(struct evdev)); 665 666 INIT_LIST_HEAD(&evdev->list); 667 init_waitqueue_head(&evdev->wait); 668 669 evdev->exist = 1; 670 evdev->minor = minor; 671 evdev->handle.dev = dev; 672 evdev->handle.name = evdev->name; 673 evdev->handle.handler = handler; 674 evdev->handle.private = evdev; 675 sprintf(evdev->name, "event%d", minor); 676 677 evdev_table[minor] = evdev; 678 679 devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), 680 S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor); 681 class_device_create(input_class, 682 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), 683 dev->dev, "event%d", minor); 684 685 return &evdev->handle; 686 } 687 688 static void evdev_disconnect(struct input_handle *handle) 689 { 690 struct evdev *evdev = handle->private; 691 struct evdev_list *list; 692 693 class_device_destroy(input_class, 694 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor)); 695 devfs_remove("input/event%d", evdev->minor); 696 evdev->exist = 0; 697 698 if (evdev->open) { 699 input_close_device(handle); 700 wake_up_interruptible(&evdev->wait); 701 list_for_each_entry(list, &evdev->list, node) 702 kill_fasync(&list->fasync, SIGIO, POLL_HUP); 703 } else 704 evdev_free(evdev); 705 } 706 707 static struct input_device_id evdev_ids[] = { 708 { .driver_info = 1 }, /* Matches all devices */ 709 { }, /* Terminating zero entry */ 710 }; 711 712 MODULE_DEVICE_TABLE(input, evdev_ids); 713 714 static struct input_handler evdev_handler = { 715 .event = evdev_event, 716 .connect = evdev_connect, 717 .disconnect = evdev_disconnect, 718 .fops = &evdev_fops, 719 .minor = EVDEV_MINOR_BASE, 720 .name = "evdev", 721 .id_table = evdev_ids, 722 }; 723 724 static int __init evdev_init(void) 725 { 726 input_register_handler(&evdev_handler); 727 return 0; 728 } 729 730 static void __exit evdev_exit(void) 731 { 732 input_unregister_handler(&evdev_handler); 733 } 734 735 module_init(evdev_init); 736 module_exit(evdev_exit); 737 738 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 739 MODULE_DESCRIPTION("Input driver event char devices"); 740 MODULE_LICENSE("GPL"); 741