1 /* 2 * The input core 3 * 4 * Copyright (c) 1999-2002 Vojtech Pavlik 5 */ 6 7 /* 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 as published by 10 * the Free Software Foundation. 11 */ 12 13 #include <linux/init.h> 14 #include <linux/sched.h> 15 #include <linux/smp_lock.h> 16 #include <linux/input.h> 17 #include <linux/module.h> 18 #include <linux/random.h> 19 #include <linux/major.h> 20 #include <linux/proc_fs.h> 21 #include <linux/kobject_uevent.h> 22 #include <linux/interrupt.h> 23 #include <linux/poll.h> 24 #include <linux/device.h> 25 #include <linux/devfs_fs_kernel.h> 26 27 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); 28 MODULE_DESCRIPTION("Input core"); 29 MODULE_LICENSE("GPL"); 30 31 EXPORT_SYMBOL(input_register_device); 32 EXPORT_SYMBOL(input_unregister_device); 33 EXPORT_SYMBOL(input_register_handler); 34 EXPORT_SYMBOL(input_unregister_handler); 35 EXPORT_SYMBOL(input_grab_device); 36 EXPORT_SYMBOL(input_release_device); 37 EXPORT_SYMBOL(input_open_device); 38 EXPORT_SYMBOL(input_close_device); 39 EXPORT_SYMBOL(input_accept_process); 40 EXPORT_SYMBOL(input_flush_device); 41 EXPORT_SYMBOL(input_event); 42 EXPORT_SYMBOL(input_class); 43 44 #define INPUT_DEVICES 256 45 46 static LIST_HEAD(input_dev_list); 47 static LIST_HEAD(input_handler_list); 48 49 static struct input_handler *input_table[8]; 50 51 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 52 { 53 struct input_handle *handle; 54 55 if (type > EV_MAX || !test_bit(type, dev->evbit)) 56 return; 57 58 add_input_randomness(type, code, value); 59 60 switch (type) { 61 62 case EV_SYN: 63 switch (code) { 64 case SYN_CONFIG: 65 if (dev->event) dev->event(dev, type, code, value); 66 break; 67 68 case SYN_REPORT: 69 if (dev->sync) return; 70 dev->sync = 1; 71 break; 72 } 73 break; 74 75 case EV_KEY: 76 77 if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value) 78 return; 79 80 if (value == 2) 81 break; 82 83 change_bit(code, dev->key); 84 85 if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) { 86 dev->repeat_key = code; 87 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); 88 } 89 90 break; 91 92 case EV_SW: 93 94 if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value) 95 return; 96 97 change_bit(code, dev->sw); 98 99 break; 100 101 case EV_ABS: 102 103 if (code > ABS_MAX || !test_bit(code, dev->absbit)) 104 return; 105 106 if (dev->absfuzz[code]) { 107 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) && 108 (value < dev->abs[code] + (dev->absfuzz[code] >> 1))) 109 return; 110 111 if ((value > dev->abs[code] - dev->absfuzz[code]) && 112 (value < dev->abs[code] + dev->absfuzz[code])) 113 value = (dev->abs[code] * 3 + value) >> 2; 114 115 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) && 116 (value < dev->abs[code] + (dev->absfuzz[code] << 1))) 117 value = (dev->abs[code] + value) >> 1; 118 } 119 120 if (dev->abs[code] == value) 121 return; 122 123 dev->abs[code] = value; 124 break; 125 126 case EV_REL: 127 128 if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0)) 129 return; 130 131 break; 132 133 case EV_MSC: 134 135 if (code > MSC_MAX || !test_bit(code, dev->mscbit)) 136 return; 137 138 if (dev->event) dev->event(dev, type, code, value); 139 140 break; 141 142 case EV_LED: 143 144 if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value) 145 return; 146 147 change_bit(code, dev->led); 148 if (dev->event) dev->event(dev, type, code, value); 149 150 break; 151 152 case EV_SND: 153 154 if (code > SND_MAX || !test_bit(code, dev->sndbit)) 155 return; 156 157 if (dev->event) dev->event(dev, type, code, value); 158 159 break; 160 161 case EV_REP: 162 163 if (code > REP_MAX || value < 0 || dev->rep[code] == value) return; 164 165 dev->rep[code] = value; 166 if (dev->event) dev->event(dev, type, code, value); 167 168 break; 169 170 case EV_FF: 171 if (dev->event) dev->event(dev, type, code, value); 172 break; 173 } 174 175 if (type != EV_SYN) 176 dev->sync = 0; 177 178 if (dev->grab) 179 dev->grab->handler->event(dev->grab, type, code, value); 180 else 181 list_for_each_entry(handle, &dev->h_list, d_node) 182 if (handle->open) 183 handle->handler->event(handle, type, code, value); 184 } 185 186 static void input_repeat_key(unsigned long data) 187 { 188 struct input_dev *dev = (void *) data; 189 190 if (!test_bit(dev->repeat_key, dev->key)) 191 return; 192 193 input_event(dev, EV_KEY, dev->repeat_key, 2); 194 input_sync(dev); 195 196 if (dev->rep[REP_PERIOD]) 197 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD])); 198 } 199 200 int input_accept_process(struct input_handle *handle, struct file *file) 201 { 202 if (handle->dev->accept) 203 return handle->dev->accept(handle->dev, file); 204 205 return 0; 206 } 207 208 int input_grab_device(struct input_handle *handle) 209 { 210 if (handle->dev->grab) 211 return -EBUSY; 212 213 handle->dev->grab = handle; 214 return 0; 215 } 216 217 void input_release_device(struct input_handle *handle) 218 { 219 if (handle->dev->grab == handle) 220 handle->dev->grab = NULL; 221 } 222 223 int input_open_device(struct input_handle *handle) 224 { 225 struct input_dev *dev = handle->dev; 226 int err; 227 228 err = down_interruptible(&dev->sem); 229 if (err) 230 return err; 231 232 handle->open++; 233 234 if (!dev->users++ && dev->open) 235 err = dev->open(dev); 236 237 if (err) 238 handle->open--; 239 240 up(&dev->sem); 241 242 return err; 243 } 244 245 int input_flush_device(struct input_handle* handle, struct file* file) 246 { 247 if (handle->dev->flush) 248 return handle->dev->flush(handle->dev, file); 249 250 return 0; 251 } 252 253 void input_close_device(struct input_handle *handle) 254 { 255 struct input_dev *dev = handle->dev; 256 257 input_release_device(handle); 258 259 down(&dev->sem); 260 261 if (!--dev->users && dev->close) 262 dev->close(dev); 263 handle->open--; 264 265 up(&dev->sem); 266 } 267 268 static void input_link_handle(struct input_handle *handle) 269 { 270 list_add_tail(&handle->d_node, &handle->dev->h_list); 271 list_add_tail(&handle->h_node, &handle->handler->h_list); 272 } 273 274 #define MATCH_BIT(bit, max) \ 275 for (i = 0; i < NBITS(max); i++) \ 276 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ 277 break; \ 278 if (i != NBITS(max)) \ 279 continue; 280 281 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev) 282 { 283 int i; 284 285 for (; id->flags || id->driver_info; id++) { 286 287 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) 288 if (id->id.bustype != dev->id.bustype) 289 continue; 290 291 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) 292 if (id->id.vendor != dev->id.vendor) 293 continue; 294 295 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) 296 if (id->id.product != dev->id.product) 297 continue; 298 299 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) 300 if (id->id.version != dev->id.version) 301 continue; 302 303 MATCH_BIT(evbit, EV_MAX); 304 MATCH_BIT(keybit, KEY_MAX); 305 MATCH_BIT(relbit, REL_MAX); 306 MATCH_BIT(absbit, ABS_MAX); 307 MATCH_BIT(mscbit, MSC_MAX); 308 MATCH_BIT(ledbit, LED_MAX); 309 MATCH_BIT(sndbit, SND_MAX); 310 MATCH_BIT(ffbit, FF_MAX); 311 MATCH_BIT(swbit, SW_MAX); 312 313 return id; 314 } 315 316 return NULL; 317 } 318 319 320 /* 321 * Input hotplugging interface - loading event handlers based on 322 * device bitfields. 323 */ 324 325 #ifdef CONFIG_HOTPLUG 326 327 /* 328 * Input hotplugging invokes what /proc/sys/kernel/hotplug says 329 * (normally /sbin/hotplug) when input devices get added or removed. 330 * 331 * This invokes a user mode policy agent, typically helping to load driver 332 * or other modules, configure the device, and more. Drivers can provide 333 * a MODULE_DEVICE_TABLE to help with module loading subtasks. 334 * 335 */ 336 337 #define SPRINTF_BIT_A(bit, name, max) \ 338 do { \ 339 envp[i++] = scratch; \ 340 scratch += sprintf(scratch, name); \ 341 for (j = NBITS(max) - 1; j >= 0; j--) \ 342 if (dev->bit[j]) break; \ 343 for (; j >= 0; j--) \ 344 scratch += sprintf(scratch, "%lx ", dev->bit[j]); \ 345 scratch++; \ 346 } while (0) 347 348 #define SPRINTF_BIT_A2(bit, name, max, ev) \ 349 do { \ 350 if (test_bit(ev, dev->evbit)) \ 351 SPRINTF_BIT_A(bit, name, max); \ 352 } while (0) 353 354 static void input_call_hotplug(char *verb, struct input_dev *dev) 355 { 356 char *argv[3], **envp, *buf, *scratch; 357 int i = 0, j, value; 358 359 if (!hotplug_path[0]) { 360 printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n"); 361 return; 362 } 363 if (in_interrupt()) { 364 printk(KERN_ERR "input.c: calling hotplug from interrupt\n"); 365 return; 366 } 367 if (!current->fs->root) { 368 printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n"); 369 return; 370 } 371 if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) { 372 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n"); 373 return; 374 } 375 if (!(buf = kmalloc(1024, GFP_KERNEL))) { 376 kfree (envp); 377 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n"); 378 return; 379 } 380 381 argv[0] = hotplug_path; 382 argv[1] = "input"; 383 argv[2] = NULL; 384 385 envp[i++] = "HOME=/"; 386 envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; 387 388 scratch = buf; 389 390 envp[i++] = scratch; 391 scratch += sprintf(scratch, "ACTION=%s", verb) + 1; 392 393 envp[i++] = scratch; 394 scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x", 395 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1; 396 397 if (dev->name) { 398 envp[i++] = scratch; 399 scratch += sprintf(scratch, "NAME=%s", dev->name) + 1; 400 } 401 402 if (dev->phys) { 403 envp[i++] = scratch; 404 scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1; 405 } 406 407 SPRINTF_BIT_A(evbit, "EV=", EV_MAX); 408 SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY); 409 SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL); 410 SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS); 411 SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC); 412 SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED); 413 SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND); 414 SPRINTF_BIT_A2(ffbit, "FF=", FF_MAX, EV_FF); 415 SPRINTF_BIT_A2(swbit, "SW=", SW_MAX, EV_SW); 416 417 envp[i++] = NULL; 418 419 #ifdef INPUT_DEBUG 420 printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n", 421 argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]); 422 #endif 423 424 value = call_usermodehelper(argv [0], argv, envp, 0); 425 426 kfree(buf); 427 kfree(envp); 428 429 #ifdef INPUT_DEBUG 430 if (value != 0) 431 printk(KERN_DEBUG "input.c: hotplug returned %d\n", value); 432 #endif 433 } 434 435 #endif 436 437 #ifdef CONFIG_PROC_FS 438 439 static struct proc_dir_entry *proc_bus_input_dir; 440 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); 441 static int input_devices_state; 442 443 static inline void input_wakeup_procfs_readers(void) 444 { 445 input_devices_state++; 446 wake_up(&input_devices_poll_wait); 447 } 448 449 static unsigned int input_devices_poll(struct file *file, poll_table *wait) 450 { 451 int state = input_devices_state; 452 poll_wait(file, &input_devices_poll_wait, wait); 453 if (state != input_devices_state) 454 return POLLIN | POLLRDNORM; 455 return 0; 456 } 457 458 #define SPRINTF_BIT_B(bit, name, max) \ 459 do { \ 460 len += sprintf(buf + len, "B: %s", name); \ 461 for (i = NBITS(max) - 1; i >= 0; i--) \ 462 if (dev->bit[i]) break; \ 463 for (; i >= 0; i--) \ 464 len += sprintf(buf + len, "%lx ", dev->bit[i]); \ 465 len += sprintf(buf + len, "\n"); \ 466 } while (0) 467 468 #define SPRINTF_BIT_B2(bit, name, max, ev) \ 469 do { \ 470 if (test_bit(ev, dev->evbit)) \ 471 SPRINTF_BIT_B(bit, name, max); \ 472 } while (0) 473 474 static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data) 475 { 476 struct input_dev *dev; 477 struct input_handle *handle; 478 479 off_t at = 0; 480 int i, len, cnt = 0; 481 482 list_for_each_entry(dev, &input_dev_list, node) { 483 484 len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", 485 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); 486 487 len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); 488 len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : ""); 489 len += sprintf(buf + len, "H: Handlers="); 490 491 list_for_each_entry(handle, &dev->h_list, d_node) 492 len += sprintf(buf + len, "%s ", handle->name); 493 494 len += sprintf(buf + len, "\n"); 495 496 SPRINTF_BIT_B(evbit, "EV=", EV_MAX); 497 SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY); 498 SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL); 499 SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS); 500 SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC); 501 SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED); 502 SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND); 503 SPRINTF_BIT_B2(ffbit, "FF=", FF_MAX, EV_FF); 504 SPRINTF_BIT_B2(swbit, "SW=", SW_MAX, EV_SW); 505 506 len += sprintf(buf + len, "\n"); 507 508 at += len; 509 510 if (at >= pos) { 511 if (!*start) { 512 *start = buf + (pos - (at - len)); 513 cnt = at - pos; 514 } else cnt += len; 515 buf += len; 516 if (cnt >= count) 517 break; 518 } 519 } 520 521 if (&dev->node == &input_dev_list) 522 *eof = 1; 523 524 return (count > cnt) ? cnt : count; 525 } 526 527 static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data) 528 { 529 struct input_handler *handler; 530 531 off_t at = 0; 532 int len = 0, cnt = 0; 533 int i = 0; 534 535 list_for_each_entry(handler, &input_handler_list, node) { 536 537 if (handler->fops) 538 len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n", 539 i++, handler->name, handler->minor); 540 else 541 len = sprintf(buf, "N: Number=%d Name=%s\n", 542 i++, handler->name); 543 544 at += len; 545 546 if (at >= pos) { 547 if (!*start) { 548 *start = buf + (pos - (at - len)); 549 cnt = at - pos; 550 } else cnt += len; 551 buf += len; 552 if (cnt >= count) 553 break; 554 } 555 } 556 if (&handler->node == &input_handler_list) 557 *eof = 1; 558 559 return (count > cnt) ? cnt : count; 560 } 561 562 static struct file_operations input_fileops; 563 564 static int __init input_proc_init(void) 565 { 566 struct proc_dir_entry *entry; 567 568 proc_bus_input_dir = proc_mkdir("input", proc_bus); 569 if (!proc_bus_input_dir) 570 return -ENOMEM; 571 572 proc_bus_input_dir->owner = THIS_MODULE; 573 574 entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL); 575 if (!entry) 576 goto fail1; 577 578 entry->owner = THIS_MODULE; 579 input_fileops = *entry->proc_fops; 580 entry->proc_fops = &input_fileops; 581 entry->proc_fops->poll = input_devices_poll; 582 583 entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL); 584 if (!entry) 585 goto fail2; 586 587 entry->owner = THIS_MODULE; 588 589 return 0; 590 591 fail2: remove_proc_entry("devices", proc_bus_input_dir); 592 fail1: remove_proc_entry("input", proc_bus); 593 return -ENOMEM; 594 } 595 596 static void input_proc_exit(void) 597 { 598 remove_proc_entry("devices", proc_bus_input_dir); 599 remove_proc_entry("handlers", proc_bus_input_dir); 600 remove_proc_entry("input", proc_bus); 601 } 602 603 #else /* !CONFIG_PROC_FS */ 604 static inline void input_wakeup_procfs_readers(void) { } 605 static inline int input_proc_init(void) { return 0; } 606 static inline void input_proc_exit(void) { } 607 #endif 608 609 void input_register_device(struct input_dev *dev) 610 { 611 struct input_handle *handle; 612 struct input_handler *handler; 613 struct input_device_id *id; 614 615 set_bit(EV_SYN, dev->evbit); 616 617 init_MUTEX(&dev->sem); 618 619 /* 620 * If delay and period are pre-set by the driver, then autorepeating 621 * is handled by the driver itself and we don't do it in input.c. 622 */ 623 624 init_timer(&dev->timer); 625 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { 626 dev->timer.data = (long) dev; 627 dev->timer.function = input_repeat_key; 628 dev->rep[REP_DELAY] = 250; 629 dev->rep[REP_PERIOD] = 33; 630 } 631 632 INIT_LIST_HEAD(&dev->h_list); 633 list_add_tail(&dev->node, &input_dev_list); 634 635 list_for_each_entry(handler, &input_handler_list, node) 636 if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) 637 if ((id = input_match_device(handler->id_table, dev))) 638 if ((handle = handler->connect(handler, dev, id))) 639 input_link_handle(handle); 640 641 #ifdef CONFIG_HOTPLUG 642 input_call_hotplug("add", dev); 643 #endif 644 645 input_wakeup_procfs_readers(); 646 } 647 648 void input_unregister_device(struct input_dev *dev) 649 { 650 struct list_head * node, * next; 651 652 if (!dev) return; 653 654 del_timer_sync(&dev->timer); 655 656 list_for_each_safe(node, next, &dev->h_list) { 657 struct input_handle * handle = to_handle(node); 658 list_del_init(&handle->d_node); 659 list_del_init(&handle->h_node); 660 handle->handler->disconnect(handle); 661 } 662 663 #ifdef CONFIG_HOTPLUG 664 input_call_hotplug("remove", dev); 665 #endif 666 667 list_del_init(&dev->node); 668 669 input_wakeup_procfs_readers(); 670 } 671 672 void input_register_handler(struct input_handler *handler) 673 { 674 struct input_dev *dev; 675 struct input_handle *handle; 676 struct input_device_id *id; 677 678 if (!handler) return; 679 680 INIT_LIST_HEAD(&handler->h_list); 681 682 if (handler->fops != NULL) 683 input_table[handler->minor >> 5] = handler; 684 685 list_add_tail(&handler->node, &input_handler_list); 686 687 list_for_each_entry(dev, &input_dev_list, node) 688 if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) 689 if ((id = input_match_device(handler->id_table, dev))) 690 if ((handle = handler->connect(handler, dev, id))) 691 input_link_handle(handle); 692 693 input_wakeup_procfs_readers(); 694 } 695 696 void input_unregister_handler(struct input_handler *handler) 697 { 698 struct list_head * node, * next; 699 700 list_for_each_safe(node, next, &handler->h_list) { 701 struct input_handle * handle = to_handle_h(node); 702 list_del_init(&handle->h_node); 703 list_del_init(&handle->d_node); 704 handler->disconnect(handle); 705 } 706 707 list_del_init(&handler->node); 708 709 if (handler->fops != NULL) 710 input_table[handler->minor >> 5] = NULL; 711 712 input_wakeup_procfs_readers(); 713 } 714 715 static int input_open_file(struct inode *inode, struct file *file) 716 { 717 struct input_handler *handler = input_table[iminor(inode) >> 5]; 718 struct file_operations *old_fops, *new_fops = NULL; 719 int err; 720 721 /* No load-on-demand here? */ 722 if (!handler || !(new_fops = fops_get(handler->fops))) 723 return -ENODEV; 724 725 /* 726 * That's _really_ odd. Usually NULL ->open means "nothing special", 727 * not "no device". Oh, well... 728 */ 729 if (!new_fops->open) { 730 fops_put(new_fops); 731 return -ENODEV; 732 } 733 old_fops = file->f_op; 734 file->f_op = new_fops; 735 736 err = new_fops->open(inode, file); 737 738 if (err) { 739 fops_put(file->f_op); 740 file->f_op = fops_get(old_fops); 741 } 742 fops_put(old_fops); 743 return err; 744 } 745 746 static struct file_operations input_fops = { 747 .owner = THIS_MODULE, 748 .open = input_open_file, 749 }; 750 751 struct class *input_class; 752 753 static int __init input_init(void) 754 { 755 int err; 756 757 input_class = class_create(THIS_MODULE, "input"); 758 if (IS_ERR(input_class)) { 759 printk(KERN_ERR "input: unable to register input class\n"); 760 return PTR_ERR(input_class); 761 } 762 763 err = input_proc_init(); 764 if (err) 765 goto fail1; 766 767 err = register_chrdev(INPUT_MAJOR, "input", &input_fops); 768 if (err) { 769 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); 770 goto fail2; 771 } 772 773 err = devfs_mk_dir("input"); 774 if (err) 775 goto fail3; 776 777 return 0; 778 779 fail3: unregister_chrdev(INPUT_MAJOR, "input"); 780 fail2: input_proc_exit(); 781 fail1: class_destroy(input_class); 782 return err; 783 } 784 785 static void __exit input_exit(void) 786 { 787 input_proc_exit(); 788 devfs_remove("input"); 789 unregister_chrdev(INPUT_MAJOR, "input"); 790 class_destroy(input_class); 791 } 792 793 subsys_initcall(input_init); 794 module_exit(input_exit); 795