1 /* 2 * Event char devices, giving access to raw input device events. 3 * 4 * Copyright (c) 1999-2002 Vojtech Pavlik 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published by 8 * the Free Software Foundation. 9 */ 10 11 #define EVDEV_MINOR_BASE 64 12 #define EVDEV_MINORS 32 13 #define EVDEV_BUFFER_SIZE 64 14 15 #include <linux/poll.h> 16 #include <linux/slab.h> 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/input.h> 20 #include <linux/major.h> 21 #include <linux/smp_lock.h> 22 #include <linux/device.h> 23 #include <linux/compat.h> 24 25 struct evdev { 26 int exist; 27 int open; 28 int minor; 29 char name[16]; 30 struct input_handle handle; 31 wait_queue_head_t wait; 32 struct evdev_list *grab; 33 struct list_head list; 34 }; 35 36 struct evdev_list { 37 struct input_event buffer[EVDEV_BUFFER_SIZE]; 38 int head; 39 int tail; 40 struct fasync_struct *fasync; 41 struct evdev *evdev; 42 struct list_head node; 43 }; 44 45 static struct evdev *evdev_table[EVDEV_MINORS]; 46 47 static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) 48 { 49 struct evdev *evdev = handle->private; 50 struct evdev_list *list; 51 52 if (evdev->grab) { 53 list = evdev->grab; 54 55 do_gettimeofday(&list->buffer[list->head].time); 56 list->buffer[list->head].type = type; 57 list->buffer[list->head].code = code; 58 list->buffer[list->head].value = value; 59 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); 60 61 kill_fasync(&list->fasync, SIGIO, POLL_IN); 62 } else 63 list_for_each_entry(list, &evdev->list, node) { 64 65 do_gettimeofday(&list->buffer[list->head].time); 66 list->buffer[list->head].type = type; 67 list->buffer[list->head].code = code; 68 list->buffer[list->head].value = value; 69 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); 70 71 kill_fasync(&list->fasync, SIGIO, POLL_IN); 72 } 73 74 wake_up_interruptible(&evdev->wait); 75 } 76 77 static int evdev_fasync(int fd, struct file *file, int on) 78 { 79 int retval; 80 struct evdev_list *list = file->private_data; 81 retval = fasync_helper(fd, file, on, &list->fasync); 82 return retval < 0 ? retval : 0; 83 } 84 85 static int evdev_flush(struct file * file) 86 { 87 struct evdev_list *list = file->private_data; 88 if (!list->evdev->exist) return -ENODEV; 89 return input_flush_device(&list->evdev->handle, file); 90 } 91 92 static void evdev_free(struct evdev *evdev) 93 { 94 evdev_table[evdev->minor] = NULL; 95 kfree(evdev); 96 } 97 98 static int evdev_release(struct inode * inode, struct file * file) 99 { 100 struct evdev_list *list = file->private_data; 101 102 if (list->evdev->grab == list) { 103 input_release_device(&list->evdev->handle); 104 list->evdev->grab = NULL; 105 } 106 107 evdev_fasync(-1, file, 0); 108 list_del(&list->node); 109 110 if (!--list->evdev->open) { 111 if (list->evdev->exist) 112 input_close_device(&list->evdev->handle); 113 else 114 evdev_free(list->evdev); 115 } 116 117 kfree(list); 118 return 0; 119 } 120 121 static int evdev_open(struct inode * inode, struct file * file) 122 { 123 struct evdev_list *list; 124 int i = iminor(inode) - EVDEV_MINOR_BASE; 125 int accept_err; 126 127 if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist) 128 return -ENODEV; 129 130 if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file))) 131 return accept_err; 132 133 if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL))) 134 return -ENOMEM; 135 memset(list, 0, sizeof(struct evdev_list)); 136 137 list->evdev = evdev_table[i]; 138 list_add_tail(&list->node, &evdev_table[i]->list); 139 file->private_data = list; 140 141 if (!list->evdev->open++) 142 if (list->evdev->exist) 143 input_open_device(&list->evdev->handle); 144 145 return 0; 146 } 147 148 #ifdef CONFIG_COMPAT 149 struct input_event_compat { 150 struct compat_timeval time; 151 __u16 type; 152 __u16 code; 153 __s32 value; 154 }; 155 156 #ifdef CONFIG_X86_64 157 # define COMPAT_TEST test_thread_flag(TIF_IA32) 158 #elif defined(CONFIG_IA64) 159 # define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current)) 160 #elif defined(CONFIG_ARCH_S390) 161 # define COMPAT_TEST test_thread_flag(TIF_31BIT) 162 #elif defined(CONFIG_MIPS) 163 # define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR) 164 #else 165 # define COMPAT_TEST test_thread_flag(TIF_32BIT) 166 #endif 167 168 static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 169 { 170 struct evdev_list *list = file->private_data; 171 struct input_event_compat event; 172 int retval = 0; 173 174 while (retval < count) { 175 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat))) 176 return -EFAULT; 177 input_event(list->evdev->handle.dev, event.type, event.code, event.value); 178 retval += sizeof(struct input_event_compat); 179 } 180 181 return retval; 182 } 183 #endif 184 185 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 186 { 187 struct evdev_list *list = file->private_data; 188 struct input_event event; 189 int retval = 0; 190 191 if (!list->evdev->exist) return -ENODEV; 192 193 #ifdef CONFIG_COMPAT 194 if (COMPAT_TEST) 195 return evdev_write_compat(file, buffer, count, ppos); 196 #endif 197 198 while (retval < count) { 199 200 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event))) 201 return -EFAULT; 202 input_event(list->evdev->handle.dev, event.type, event.code, event.value); 203 retval += sizeof(struct input_event); 204 } 205 206 return retval; 207 } 208 209 #ifdef CONFIG_COMPAT 210 static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos) 211 { 212 struct evdev_list *list = file->private_data; 213 int retval; 214 215 if (count < sizeof(struct input_event_compat)) 216 return -EINVAL; 217 218 if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) 219 return -EAGAIN; 220 221 retval = wait_event_interruptible(list->evdev->wait, 222 list->head != list->tail || (!list->evdev->exist)); 223 224 if (retval) 225 return retval; 226 227 if (!list->evdev->exist) 228 return -ENODEV; 229 230 while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) { 231 struct input_event *event = (struct input_event *) list->buffer + list->tail; 232 struct input_event_compat event_compat; 233 event_compat.time.tv_sec = event->time.tv_sec; 234 event_compat.time.tv_usec = event->time.tv_usec; 235 event_compat.type = event->type; 236 event_compat.code = event->code; 237 event_compat.value = event->value; 238 239 if (copy_to_user(buffer + retval, &event_compat, 240 sizeof(struct input_event_compat))) return -EFAULT; 241 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); 242 retval += sizeof(struct input_event_compat); 243 } 244 245 return retval; 246 } 247 #endif 248 249 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) 250 { 251 struct evdev_list *list = file->private_data; 252 int retval; 253 254 #ifdef CONFIG_COMPAT 255 if (COMPAT_TEST) 256 return evdev_read_compat(file, buffer, count, ppos); 257 #endif 258 259 if (count < sizeof(struct input_event)) 260 return -EINVAL; 261 262 if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) 263 return -EAGAIN; 264 265 retval = wait_event_interruptible(list->evdev->wait, 266 list->head != list->tail || (!list->evdev->exist)); 267 268 if (retval) 269 return retval; 270 271 if (!list->evdev->exist) 272 return -ENODEV; 273 274 while (list->head != list->tail && retval + sizeof(struct input_event) <= count) { 275 if (copy_to_user(buffer + retval, list->buffer + list->tail, 276 sizeof(struct input_event))) return -EFAULT; 277 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); 278 retval += sizeof(struct input_event); 279 } 280 281 return retval; 282 } 283 284 /* No kernel lock - fine */ 285 static unsigned int evdev_poll(struct file *file, poll_table *wait) 286 { 287 struct evdev_list *list = file->private_data; 288 poll_wait(file, &list->evdev->wait, wait); 289 return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) | 290 (list->evdev->exist ? 0 : (POLLHUP | POLLERR)); 291 } 292 293 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 294 { 295 struct evdev_list *list = file->private_data; 296 struct evdev *evdev = list->evdev; 297 struct input_dev *dev = evdev->handle.dev; 298 struct input_absinfo abs; 299 void __user *p = (void __user *)arg; 300 int __user *ip = (int __user *)arg; 301 int i, t, u, v; 302 303 if (!evdev->exist) return -ENODEV; 304 305 switch (cmd) { 306 307 case EVIOCGVERSION: 308 return put_user(EV_VERSION, ip); 309 310 case EVIOCGID: 311 return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0; 312 313 case EVIOCGKEYCODE: 314 if (get_user(t, ip)) return -EFAULT; 315 if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL; 316 if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT; 317 return 0; 318 319 case EVIOCSKEYCODE: 320 if (get_user(t, ip)) return -EFAULT; 321 if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL; 322 if (get_user(v, ip + 1)) return -EFAULT; 323 if (v < 0 || v > KEY_MAX) return -EINVAL; 324 if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8))) return -EINVAL; 325 u = SET_INPUT_KEYCODE(dev, t, v); 326 clear_bit(u, dev->keybit); 327 set_bit(v, dev->keybit); 328 for (i = 0; i < dev->keycodemax; i++) 329 if (INPUT_KEYCODE(dev,i) == u) 330 set_bit(u, dev->keybit); 331 return 0; 332 333 case EVIOCSFF: 334 if (dev->upload_effect) { 335 struct ff_effect effect; 336 int err; 337 338 if (copy_from_user(&effect, p, sizeof(effect))) 339 return -EFAULT; 340 err = dev->upload_effect(dev, &effect); 341 if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id))) 342 return -EFAULT; 343 return err; 344 } 345 else return -ENOSYS; 346 347 case EVIOCRMFF: 348 if (dev->erase_effect) { 349 return dev->erase_effect(dev, (int)arg); 350 } 351 else return -ENOSYS; 352 353 case EVIOCGEFFECTS: 354 if (put_user(dev->ff_effects_max, ip)) 355 return -EFAULT; 356 return 0; 357 358 case EVIOCGRAB: 359 if (arg) { 360 if (evdev->grab) 361 return -EBUSY; 362 if (input_grab_device(&evdev->handle)) 363 return -EBUSY; 364 evdev->grab = list; 365 return 0; 366 } else { 367 if (evdev->grab != list) 368 return -EINVAL; 369 input_release_device(&evdev->handle); 370 evdev->grab = NULL; 371 return 0; 372 } 373 374 default: 375 376 if (_IOC_TYPE(cmd) != 'E') 377 return -EINVAL; 378 379 if (_IOC_DIR(cmd) == _IOC_READ) { 380 381 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { 382 383 long *bits; 384 int len; 385 386 switch (_IOC_NR(cmd) & EV_MAX) { 387 case 0: bits = dev->evbit; len = EV_MAX; break; 388 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; 389 case EV_REL: bits = dev->relbit; len = REL_MAX; break; 390 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; 391 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; 392 case EV_LED: bits = dev->ledbit; len = LED_MAX; break; 393 case EV_SND: bits = dev->sndbit; len = SND_MAX; break; 394 case EV_FF: bits = dev->ffbit; len = FF_MAX; break; 395 case EV_SW: bits = dev->swbit; len = SW_MAX; break; 396 default: return -EINVAL; 397 } 398 len = NBITS(len) * sizeof(long); 399 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 400 return copy_to_user(p, bits, len) ? -EFAULT : len; 401 } 402 403 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) { 404 int len; 405 len = NBITS(KEY_MAX) * sizeof(long); 406 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 407 return copy_to_user(p, dev->key, len) ? -EFAULT : len; 408 } 409 410 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) { 411 int len; 412 len = NBITS(LED_MAX) * sizeof(long); 413 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 414 return copy_to_user(p, dev->led, len) ? -EFAULT : len; 415 } 416 417 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) { 418 int len; 419 len = NBITS(SND_MAX) * sizeof(long); 420 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 421 return copy_to_user(p, dev->snd, len) ? -EFAULT : len; 422 } 423 424 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) { 425 int len; 426 len = NBITS(SW_MAX) * sizeof(long); 427 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 428 return copy_to_user(p, dev->sw, len) ? -EFAULT : len; 429 } 430 431 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { 432 int len; 433 if (!dev->name) return -ENOENT; 434 len = strlen(dev->name) + 1; 435 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 436 return copy_to_user(p, dev->name, len) ? -EFAULT : len; 437 } 438 439 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) { 440 int len; 441 if (!dev->phys) return -ENOENT; 442 len = strlen(dev->phys) + 1; 443 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 444 return copy_to_user(p, dev->phys, len) ? -EFAULT : len; 445 } 446 447 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { 448 int len; 449 if (!dev->uniq) return -ENOENT; 450 len = strlen(dev->uniq) + 1; 451 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 452 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len; 453 } 454 455 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { 456 457 int t = _IOC_NR(cmd) & ABS_MAX; 458 459 abs.value = dev->abs[t]; 460 abs.minimum = dev->absmin[t]; 461 abs.maximum = dev->absmax[t]; 462 abs.fuzz = dev->absfuzz[t]; 463 abs.flat = dev->absflat[t]; 464 465 if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) 466 return -EFAULT; 467 468 return 0; 469 } 470 471 } 472 473 if (_IOC_DIR(cmd) == _IOC_WRITE) { 474 475 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { 476 477 int t = _IOC_NR(cmd) & ABS_MAX; 478 479 if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) 480 return -EFAULT; 481 482 dev->abs[t] = abs.value; 483 dev->absmin[t] = abs.minimum; 484 dev->absmax[t] = abs.maximum; 485 dev->absfuzz[t] = abs.fuzz; 486 dev->absflat[t] = abs.flat; 487 488 return 0; 489 } 490 } 491 } 492 return -EINVAL; 493 } 494 495 #ifdef CONFIG_COMPAT 496 497 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) 498 #define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1) 499 #define OFF_COMPAT(x) ((x)%BITS_PER_LONG_COMPAT) 500 #define BIT_COMPAT(x) (1UL<<OFF_COMPAT(x)) 501 #define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT) 502 #define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1) 503 504 #ifdef __BIG_ENDIAN 505 #define bit_to_user(bit, max) \ 506 do { \ 507 int i; \ 508 int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \ 509 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \ 510 for (i = 0; i < len / sizeof(compat_long_t); i++) \ 511 if (copy_to_user((compat_long_t __user *) p + i, \ 512 (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \ 513 sizeof(compat_long_t))) \ 514 return -EFAULT; \ 515 return len; \ 516 } while (0) 517 #else 518 #define bit_to_user(bit, max) \ 519 do { \ 520 int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \ 521 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \ 522 return copy_to_user(p, (bit), len) ? -EFAULT : len; \ 523 } while (0) 524 #endif 525 526 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) 527 { 528 struct evdev_list *list = file->private_data; 529 struct evdev *evdev = list->evdev; 530 struct input_dev *dev = evdev->handle.dev; 531 struct input_absinfo abs; 532 void __user *p = compat_ptr(arg); 533 534 if (!evdev->exist) return -ENODEV; 535 536 switch (cmd) { 537 538 case EVIOCGVERSION: 539 case EVIOCGID: 540 case EVIOCGKEYCODE: 541 case EVIOCSKEYCODE: 542 case EVIOCSFF: 543 case EVIOCRMFF: 544 case EVIOCGEFFECTS: 545 case EVIOCGRAB: 546 return evdev_ioctl(file, cmd, (unsigned long) p); 547 548 default: 549 550 if (_IOC_TYPE(cmd) != 'E') 551 return -EINVAL; 552 553 if (_IOC_DIR(cmd) == _IOC_READ) { 554 555 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { 556 long *bits; 557 int max; 558 559 switch (_IOC_NR(cmd) & EV_MAX) { 560 case 0: bits = dev->evbit; max = EV_MAX; break; 561 case EV_KEY: bits = dev->keybit; max = KEY_MAX; break; 562 case EV_REL: bits = dev->relbit; max = REL_MAX; break; 563 case EV_ABS: bits = dev->absbit; max = ABS_MAX; break; 564 case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break; 565 case EV_LED: bits = dev->ledbit; max = LED_MAX; break; 566 case EV_SND: bits = dev->sndbit; max = SND_MAX; break; 567 case EV_FF: bits = dev->ffbit; max = FF_MAX; break; 568 case EV_SW: bits = dev->swbit; max = SW_MAX; break; 569 default: return -EINVAL; 570 } 571 bit_to_user(bits, max); 572 } 573 574 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) 575 bit_to_user(dev->key, KEY_MAX); 576 577 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) 578 bit_to_user(dev->led, LED_MAX); 579 580 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) 581 bit_to_user(dev->snd, SND_MAX); 582 583 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) 584 bit_to_user(dev->sw, SW_MAX); 585 586 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { 587 int len; 588 if (!dev->name) return -ENOENT; 589 len = strlen(dev->name) + 1; 590 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 591 return copy_to_user(p, dev->name, len) ? -EFAULT : len; 592 } 593 594 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) { 595 int len; 596 if (!dev->phys) return -ENOENT; 597 len = strlen(dev->phys) + 1; 598 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 599 return copy_to_user(p, dev->phys, len) ? -EFAULT : len; 600 } 601 602 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { 603 int len; 604 if (!dev->uniq) return -ENOENT; 605 len = strlen(dev->uniq) + 1; 606 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 607 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len; 608 } 609 610 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { 611 612 int t = _IOC_NR(cmd) & ABS_MAX; 613 614 abs.value = dev->abs[t]; 615 abs.minimum = dev->absmin[t]; 616 abs.maximum = dev->absmax[t]; 617 abs.fuzz = dev->absfuzz[t]; 618 abs.flat = dev->absflat[t]; 619 620 if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) 621 return -EFAULT; 622 623 return 0; 624 } 625 } 626 627 if (_IOC_DIR(cmd) == _IOC_WRITE) { 628 629 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { 630 631 int t = _IOC_NR(cmd) & ABS_MAX; 632 633 if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) 634 return -EFAULT; 635 636 dev->abs[t] = abs.value; 637 dev->absmin[t] = abs.minimum; 638 dev->absmax[t] = abs.maximum; 639 dev->absfuzz[t] = abs.fuzz; 640 dev->absflat[t] = abs.flat; 641 642 return 0; 643 } 644 } 645 } 646 return -EINVAL; 647 } 648 #endif 649 650 static struct file_operations evdev_fops = { 651 .owner = THIS_MODULE, 652 .read = evdev_read, 653 .write = evdev_write, 654 .poll = evdev_poll, 655 .open = evdev_open, 656 .release = evdev_release, 657 .unlocked_ioctl = evdev_ioctl, 658 #ifdef CONFIG_COMPAT 659 .compat_ioctl = evdev_ioctl_compat, 660 #endif 661 .fasync = evdev_fasync, 662 .flush = evdev_flush 663 }; 664 665 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) 666 { 667 struct evdev *evdev; 668 struct class_device *cdev; 669 int minor; 670 671 for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++); 672 if (minor == EVDEV_MINORS) { 673 printk(KERN_ERR "evdev: no more free evdev devices\n"); 674 return NULL; 675 } 676 677 if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL))) 678 return NULL; 679 memset(evdev, 0, sizeof(struct evdev)); 680 681 INIT_LIST_HEAD(&evdev->list); 682 init_waitqueue_head(&evdev->wait); 683 684 evdev->exist = 1; 685 evdev->minor = minor; 686 evdev->handle.dev = dev; 687 evdev->handle.name = evdev->name; 688 evdev->handle.handler = handler; 689 evdev->handle.private = evdev; 690 sprintf(evdev->name, "event%d", minor); 691 692 evdev_table[minor] = evdev; 693 694 cdev = class_device_create(&input_class, &dev->cdev, 695 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), 696 dev->cdev.dev, evdev->name); 697 698 /* temporary symlink to keep userspace happy */ 699 sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj, 700 evdev->name); 701 702 return &evdev->handle; 703 } 704 705 static void evdev_disconnect(struct input_handle *handle) 706 { 707 struct evdev *evdev = handle->private; 708 struct evdev_list *list; 709 710 sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name); 711 class_device_destroy(&input_class, 712 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor)); 713 evdev->exist = 0; 714 715 if (evdev->open) { 716 input_close_device(handle); 717 wake_up_interruptible(&evdev->wait); 718 list_for_each_entry(list, &evdev->list, node) 719 kill_fasync(&list->fasync, SIGIO, POLL_HUP); 720 } else 721 evdev_free(evdev); 722 } 723 724 static struct input_device_id evdev_ids[] = { 725 { .driver_info = 1 }, /* Matches all devices */ 726 { }, /* Terminating zero entry */ 727 }; 728 729 MODULE_DEVICE_TABLE(input, evdev_ids); 730 731 static struct input_handler evdev_handler = { 732 .event = evdev_event, 733 .connect = evdev_connect, 734 .disconnect = evdev_disconnect, 735 .fops = &evdev_fops, 736 .minor = EVDEV_MINOR_BASE, 737 .name = "evdev", 738 .id_table = evdev_ids, 739 }; 740 741 static int __init evdev_init(void) 742 { 743 input_register_handler(&evdev_handler); 744 return 0; 745 } 746 747 static void __exit evdev_exit(void) 748 { 749 input_unregister_handler(&evdev_handler); 750 } 751 752 module_init(evdev_init); 753 module_exit(evdev_exit); 754 755 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 756 MODULE_DESCRIPTION("Input driver event char devices"); 757 MODULE_LICENSE("GPL"); 758