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"); 744