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/smp_lock.h> 15 #include <linux/input.h> 16 #include <linux/module.h> 17 #include <linux/random.h> 18 #include <linux/major.h> 19 #include <linux/proc_fs.h> 20 #include <linux/seq_file.h> 21 #include <linux/interrupt.h> 22 #include <linux/poll.h> 23 #include <linux/device.h> 24 #include <linux/mutex.h> 25 26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); 27 MODULE_DESCRIPTION("Input core"); 28 MODULE_LICENSE("GPL"); 29 30 #define INPUT_DEVICES 256 31 32 static LIST_HEAD(input_dev_list); 33 static LIST_HEAD(input_handler_list); 34 35 static struct input_handler *input_table[8]; 36 37 /** 38 * input_event() - report new input event 39 * @dev: device that generated the event 40 * @type: type of the event 41 * @code: event code 42 * @value: value of the event 43 * 44 * This function should be used by drivers implementing various input devices 45 * See also input_inject_event() 46 */ 47 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 48 { 49 struct input_handle *handle; 50 51 if (type > EV_MAX || !test_bit(type, dev->evbit)) 52 return; 53 54 add_input_randomness(type, code, value); 55 56 switch (type) { 57 58 case EV_SYN: 59 switch (code) { 60 case SYN_CONFIG: 61 if (dev->event) 62 dev->event(dev, type, code, value); 63 break; 64 65 case SYN_REPORT: 66 if (dev->sync) 67 return; 68 dev->sync = 1; 69 break; 70 } 71 break; 72 73 case EV_KEY: 74 75 if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value) 76 return; 77 78 if (value == 2) 79 break; 80 81 change_bit(code, dev->key); 82 83 if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) { 84 dev->repeat_key = code; 85 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); 86 } 87 88 break; 89 90 case EV_SW: 91 92 if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value) 93 return; 94 95 change_bit(code, dev->sw); 96 97 break; 98 99 case EV_ABS: 100 101 if (code > ABS_MAX || !test_bit(code, dev->absbit)) 102 return; 103 104 if (dev->absfuzz[code]) { 105 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) && 106 (value < dev->abs[code] + (dev->absfuzz[code] >> 1))) 107 return; 108 109 if ((value > dev->abs[code] - dev->absfuzz[code]) && 110 (value < dev->abs[code] + dev->absfuzz[code])) 111 value = (dev->abs[code] * 3 + value) >> 2; 112 113 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) && 114 (value < dev->abs[code] + (dev->absfuzz[code] << 1))) 115 value = (dev->abs[code] + value) >> 1; 116 } 117 118 if (dev->abs[code] == value) 119 return; 120 121 dev->abs[code] = value; 122 break; 123 124 case EV_REL: 125 126 if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0)) 127 return; 128 129 break; 130 131 case EV_MSC: 132 133 if (code > MSC_MAX || !test_bit(code, dev->mscbit)) 134 return; 135 136 if (dev->event) 137 dev->event(dev, type, code, value); 138 139 break; 140 141 case EV_LED: 142 143 if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value) 144 return; 145 146 change_bit(code, dev->led); 147 148 if (dev->event) 149 dev->event(dev, type, code, value); 150 151 break; 152 153 case EV_SND: 154 155 if (code > SND_MAX || !test_bit(code, dev->sndbit)) 156 return; 157 158 if (!!test_bit(code, dev->snd) != !!value) 159 change_bit(code, dev->snd); 160 161 if (dev->event) 162 dev->event(dev, type, code, value); 163 164 break; 165 166 case EV_REP: 167 168 if (code > REP_MAX || value < 0 || dev->rep[code] == value) 169 return; 170 171 dev->rep[code] = value; 172 if (dev->event) 173 dev->event(dev, type, code, value); 174 175 break; 176 177 case EV_FF: 178 179 if (value < 0) 180 return; 181 182 if (dev->event) 183 dev->event(dev, type, code, value); 184 break; 185 } 186 187 if (type != EV_SYN) 188 dev->sync = 0; 189 190 if (dev->grab) 191 dev->grab->handler->event(dev->grab, type, code, value); 192 else 193 list_for_each_entry(handle, &dev->h_list, d_node) 194 if (handle->open) 195 handle->handler->event(handle, type, code, value); 196 } 197 EXPORT_SYMBOL(input_event); 198 199 /** 200 * input_inject_event() - send input event from input handler 201 * @handle: input handle to send event through 202 * @type: type of the event 203 * @code: event code 204 * @value: value of the event 205 * 206 * Similar to input_event() but will ignore event if device is "grabbed" and handle 207 * injecting event is not the one that owns the device. 208 */ 209 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) 210 { 211 if (!handle->dev->grab || handle->dev->grab == handle) 212 input_event(handle->dev, type, code, value); 213 } 214 EXPORT_SYMBOL(input_inject_event); 215 216 static void input_repeat_key(unsigned long data) 217 { 218 struct input_dev *dev = (void *) data; 219 220 if (!test_bit(dev->repeat_key, dev->key)) 221 return; 222 223 input_event(dev, EV_KEY, dev->repeat_key, 2); 224 input_sync(dev); 225 226 if (dev->rep[REP_PERIOD]) 227 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD])); 228 } 229 230 int input_grab_device(struct input_handle *handle) 231 { 232 if (handle->dev->grab) 233 return -EBUSY; 234 235 handle->dev->grab = handle; 236 return 0; 237 } 238 EXPORT_SYMBOL(input_grab_device); 239 240 void input_release_device(struct input_handle *handle) 241 { 242 struct input_dev *dev = handle->dev; 243 244 if (dev->grab == handle) { 245 dev->grab = NULL; 246 247 list_for_each_entry(handle, &dev->h_list, d_node) 248 if (handle->handler->start) 249 handle->handler->start(handle); 250 } 251 } 252 EXPORT_SYMBOL(input_release_device); 253 254 int input_open_device(struct input_handle *handle) 255 { 256 struct input_dev *dev = handle->dev; 257 int err; 258 259 err = mutex_lock_interruptible(&dev->mutex); 260 if (err) 261 return err; 262 263 handle->open++; 264 265 if (!dev->users++ && dev->open) 266 err = dev->open(dev); 267 268 if (err) 269 handle->open--; 270 271 mutex_unlock(&dev->mutex); 272 273 return err; 274 } 275 EXPORT_SYMBOL(input_open_device); 276 277 int input_flush_device(struct input_handle* handle, struct file* file) 278 { 279 if (handle->dev->flush) 280 return handle->dev->flush(handle->dev, file); 281 282 return 0; 283 } 284 EXPORT_SYMBOL(input_flush_device); 285 286 void input_close_device(struct input_handle *handle) 287 { 288 struct input_dev *dev = handle->dev; 289 290 input_release_device(handle); 291 292 mutex_lock(&dev->mutex); 293 294 if (!--dev->users && dev->close) 295 dev->close(dev); 296 handle->open--; 297 298 mutex_unlock(&dev->mutex); 299 } 300 EXPORT_SYMBOL(input_close_device); 301 302 static int input_fetch_keycode(struct input_dev *dev, int scancode) 303 { 304 switch (dev->keycodesize) { 305 case 1: 306 return ((u8 *)dev->keycode)[scancode]; 307 308 case 2: 309 return ((u16 *)dev->keycode)[scancode]; 310 311 default: 312 return ((u32 *)dev->keycode)[scancode]; 313 } 314 } 315 316 static int input_default_getkeycode(struct input_dev *dev, 317 int scancode, int *keycode) 318 { 319 if (!dev->keycodesize) 320 return -EINVAL; 321 322 if (scancode < 0 || scancode >= dev->keycodemax) 323 return -EINVAL; 324 325 *keycode = input_fetch_keycode(dev, scancode); 326 327 return 0; 328 } 329 330 static int input_default_setkeycode(struct input_dev *dev, 331 int scancode, int keycode) 332 { 333 int old_keycode; 334 int i; 335 336 if (scancode < 0 || scancode >= dev->keycodemax) 337 return -EINVAL; 338 339 if (keycode < 0 || keycode > KEY_MAX) 340 return -EINVAL; 341 342 if (!dev->keycodesize) 343 return -EINVAL; 344 345 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) 346 return -EINVAL; 347 348 switch (dev->keycodesize) { 349 case 1: { 350 u8 *k = (u8 *)dev->keycode; 351 old_keycode = k[scancode]; 352 k[scancode] = keycode; 353 break; 354 } 355 case 2: { 356 u16 *k = (u16 *)dev->keycode; 357 old_keycode = k[scancode]; 358 k[scancode] = keycode; 359 break; 360 } 361 default: { 362 u32 *k = (u32 *)dev->keycode; 363 old_keycode = k[scancode]; 364 k[scancode] = keycode; 365 break; 366 } 367 } 368 369 clear_bit(old_keycode, dev->keybit); 370 set_bit(keycode, dev->keybit); 371 372 for (i = 0; i < dev->keycodemax; i++) { 373 if (input_fetch_keycode(dev, i) == old_keycode) { 374 set_bit(old_keycode, dev->keybit); 375 break; /* Setting the bit twice is useless, so break */ 376 } 377 } 378 379 return 0; 380 } 381 382 383 #define MATCH_BIT(bit, max) \ 384 for (i = 0; i < NBITS(max); i++) \ 385 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ 386 break; \ 387 if (i != NBITS(max)) \ 388 continue; 389 390 static const struct input_device_id *input_match_device(const struct input_device_id *id, 391 struct input_dev *dev) 392 { 393 int i; 394 395 for (; id->flags || id->driver_info; id++) { 396 397 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) 398 if (id->bustype != dev->id.bustype) 399 continue; 400 401 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) 402 if (id->vendor != dev->id.vendor) 403 continue; 404 405 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) 406 if (id->product != dev->id.product) 407 continue; 408 409 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) 410 if (id->version != dev->id.version) 411 continue; 412 413 MATCH_BIT(evbit, EV_MAX); 414 MATCH_BIT(keybit, KEY_MAX); 415 MATCH_BIT(relbit, REL_MAX); 416 MATCH_BIT(absbit, ABS_MAX); 417 MATCH_BIT(mscbit, MSC_MAX); 418 MATCH_BIT(ledbit, LED_MAX); 419 MATCH_BIT(sndbit, SND_MAX); 420 MATCH_BIT(ffbit, FF_MAX); 421 MATCH_BIT(swbit, SW_MAX); 422 423 return id; 424 } 425 426 return NULL; 427 } 428 429 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) 430 { 431 const struct input_device_id *id; 432 int error; 433 434 if (handler->blacklist && input_match_device(handler->blacklist, dev)) 435 return -ENODEV; 436 437 id = input_match_device(handler->id_table, dev); 438 if (!id) 439 return -ENODEV; 440 441 error = handler->connect(handler, dev, id); 442 if (error && error != -ENODEV) 443 printk(KERN_ERR 444 "input: failed to attach handler %s to device %s, " 445 "error: %d\n", 446 handler->name, kobject_name(&dev->cdev.kobj), error); 447 448 return error; 449 } 450 451 452 #ifdef CONFIG_PROC_FS 453 454 static struct proc_dir_entry *proc_bus_input_dir; 455 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); 456 static int input_devices_state; 457 458 static inline void input_wakeup_procfs_readers(void) 459 { 460 input_devices_state++; 461 wake_up(&input_devices_poll_wait); 462 } 463 464 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) 465 { 466 int state = input_devices_state; 467 468 poll_wait(file, &input_devices_poll_wait, wait); 469 if (state != input_devices_state) 470 return POLLIN | POLLRDNORM; 471 472 return 0; 473 } 474 475 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos) 476 { 477 struct list_head *node; 478 loff_t i = 0; 479 480 list_for_each(node, list) 481 if (i++ == *pos) 482 return node; 483 484 return NULL; 485 } 486 487 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos) 488 { 489 if (element->next == list) 490 return NULL; 491 492 ++(*pos); 493 return element->next; 494 } 495 496 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) 497 { 498 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */ 499 500 return list_get_nth_element(&input_dev_list, pos); 501 } 502 503 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) 504 { 505 return list_get_next_element(&input_dev_list, v, pos); 506 } 507 508 static void input_devices_seq_stop(struct seq_file *seq, void *v) 509 { 510 /* release lock here */ 511 } 512 513 static void input_seq_print_bitmap(struct seq_file *seq, const char *name, 514 unsigned long *bitmap, int max) 515 { 516 int i; 517 518 for (i = NBITS(max) - 1; i > 0; i--) 519 if (bitmap[i]) 520 break; 521 522 seq_printf(seq, "B: %s=", name); 523 for (; i >= 0; i--) 524 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); 525 seq_putc(seq, '\n'); 526 } 527 528 static int input_devices_seq_show(struct seq_file *seq, void *v) 529 { 530 struct input_dev *dev = container_of(v, struct input_dev, node); 531 const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL); 532 struct input_handle *handle; 533 534 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", 535 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); 536 537 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); 538 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); 539 seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); 540 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); 541 seq_printf(seq, "H: Handlers="); 542 543 list_for_each_entry(handle, &dev->h_list, d_node) 544 seq_printf(seq, "%s ", handle->name); 545 seq_putc(seq, '\n'); 546 547 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); 548 if (test_bit(EV_KEY, dev->evbit)) 549 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); 550 if (test_bit(EV_REL, dev->evbit)) 551 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); 552 if (test_bit(EV_ABS, dev->evbit)) 553 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); 554 if (test_bit(EV_MSC, dev->evbit)) 555 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); 556 if (test_bit(EV_LED, dev->evbit)) 557 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); 558 if (test_bit(EV_SND, dev->evbit)) 559 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); 560 if (test_bit(EV_FF, dev->evbit)) 561 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); 562 if (test_bit(EV_SW, dev->evbit)) 563 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); 564 565 seq_putc(seq, '\n'); 566 567 kfree(path); 568 return 0; 569 } 570 571 static struct seq_operations input_devices_seq_ops = { 572 .start = input_devices_seq_start, 573 .next = input_devices_seq_next, 574 .stop = input_devices_seq_stop, 575 .show = input_devices_seq_show, 576 }; 577 578 static int input_proc_devices_open(struct inode *inode, struct file *file) 579 { 580 return seq_open(file, &input_devices_seq_ops); 581 } 582 583 static const struct file_operations input_devices_fileops = { 584 .owner = THIS_MODULE, 585 .open = input_proc_devices_open, 586 .poll = input_proc_devices_poll, 587 .read = seq_read, 588 .llseek = seq_lseek, 589 .release = seq_release, 590 }; 591 592 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) 593 { 594 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */ 595 seq->private = (void *)(unsigned long)*pos; 596 return list_get_nth_element(&input_handler_list, pos); 597 } 598 599 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) 600 { 601 seq->private = (void *)(unsigned long)(*pos + 1); 602 return list_get_next_element(&input_handler_list, v, pos); 603 } 604 605 static void input_handlers_seq_stop(struct seq_file *seq, void *v) 606 { 607 /* release lock here */ 608 } 609 610 static int input_handlers_seq_show(struct seq_file *seq, void *v) 611 { 612 struct input_handler *handler = container_of(v, struct input_handler, node); 613 614 seq_printf(seq, "N: Number=%ld Name=%s", 615 (unsigned long)seq->private, handler->name); 616 if (handler->fops) 617 seq_printf(seq, " Minor=%d", handler->minor); 618 seq_putc(seq, '\n'); 619 620 return 0; 621 } 622 static struct seq_operations input_handlers_seq_ops = { 623 .start = input_handlers_seq_start, 624 .next = input_handlers_seq_next, 625 .stop = input_handlers_seq_stop, 626 .show = input_handlers_seq_show, 627 }; 628 629 static int input_proc_handlers_open(struct inode *inode, struct file *file) 630 { 631 return seq_open(file, &input_handlers_seq_ops); 632 } 633 634 static const struct file_operations input_handlers_fileops = { 635 .owner = THIS_MODULE, 636 .open = input_proc_handlers_open, 637 .read = seq_read, 638 .llseek = seq_lseek, 639 .release = seq_release, 640 }; 641 642 static int __init input_proc_init(void) 643 { 644 struct proc_dir_entry *entry; 645 646 proc_bus_input_dir = proc_mkdir("input", proc_bus); 647 if (!proc_bus_input_dir) 648 return -ENOMEM; 649 650 proc_bus_input_dir->owner = THIS_MODULE; 651 652 entry = create_proc_entry("devices", 0, proc_bus_input_dir); 653 if (!entry) 654 goto fail1; 655 656 entry->owner = THIS_MODULE; 657 entry->proc_fops = &input_devices_fileops; 658 659 entry = create_proc_entry("handlers", 0, proc_bus_input_dir); 660 if (!entry) 661 goto fail2; 662 663 entry->owner = THIS_MODULE; 664 entry->proc_fops = &input_handlers_fileops; 665 666 return 0; 667 668 fail2: remove_proc_entry("devices", proc_bus_input_dir); 669 fail1: remove_proc_entry("input", proc_bus); 670 return -ENOMEM; 671 } 672 673 static void input_proc_exit(void) 674 { 675 remove_proc_entry("devices", proc_bus_input_dir); 676 remove_proc_entry("handlers", proc_bus_input_dir); 677 remove_proc_entry("input", proc_bus); 678 } 679 680 #else /* !CONFIG_PROC_FS */ 681 static inline void input_wakeup_procfs_readers(void) { } 682 static inline int input_proc_init(void) { return 0; } 683 static inline void input_proc_exit(void) { } 684 #endif 685 686 #define INPUT_DEV_STRING_ATTR_SHOW(name) \ 687 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \ 688 { \ 689 struct input_dev *input_dev = to_input_dev(dev); \ 690 \ 691 return scnprintf(buf, PAGE_SIZE, "%s\n", \ 692 input_dev->name ? input_dev->name : ""); \ 693 } \ 694 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL); 695 696 INPUT_DEV_STRING_ATTR_SHOW(name); 697 INPUT_DEV_STRING_ATTR_SHOW(phys); 698 INPUT_DEV_STRING_ATTR_SHOW(uniq); 699 700 static int input_print_modalias_bits(char *buf, int size, 701 char name, unsigned long *bm, 702 unsigned int min_bit, unsigned int max_bit) 703 { 704 int len = 0, i; 705 706 len += snprintf(buf, max(size, 0), "%c", name); 707 for (i = min_bit; i < max_bit; i++) 708 if (bm[LONG(i)] & BIT(i)) 709 len += snprintf(buf + len, max(size - len, 0), "%X,", i); 710 return len; 711 } 712 713 static int input_print_modalias(char *buf, int size, struct input_dev *id, 714 int add_cr) 715 { 716 int len; 717 718 len = snprintf(buf, max(size, 0), 719 "input:b%04Xv%04Xp%04Xe%04X-", 720 id->id.bustype, id->id.vendor, 721 id->id.product, id->id.version); 722 723 len += input_print_modalias_bits(buf + len, size - len, 724 'e', id->evbit, 0, EV_MAX); 725 len += input_print_modalias_bits(buf + len, size - len, 726 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); 727 len += input_print_modalias_bits(buf + len, size - len, 728 'r', id->relbit, 0, REL_MAX); 729 len += input_print_modalias_bits(buf + len, size - len, 730 'a', id->absbit, 0, ABS_MAX); 731 len += input_print_modalias_bits(buf + len, size - len, 732 'm', id->mscbit, 0, MSC_MAX); 733 len += input_print_modalias_bits(buf + len, size - len, 734 'l', id->ledbit, 0, LED_MAX); 735 len += input_print_modalias_bits(buf + len, size - len, 736 's', id->sndbit, 0, SND_MAX); 737 len += input_print_modalias_bits(buf + len, size - len, 738 'f', id->ffbit, 0, FF_MAX); 739 len += input_print_modalias_bits(buf + len, size - len, 740 'w', id->swbit, 0, SW_MAX); 741 742 if (add_cr) 743 len += snprintf(buf + len, max(size - len, 0), "\n"); 744 745 return len; 746 } 747 748 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf) 749 { 750 struct input_dev *id = to_input_dev(dev); 751 ssize_t len; 752 753 len = input_print_modalias(buf, PAGE_SIZE, id, 1); 754 755 return min_t(int, len, PAGE_SIZE); 756 } 757 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); 758 759 static struct attribute *input_dev_attrs[] = { 760 &class_device_attr_name.attr, 761 &class_device_attr_phys.attr, 762 &class_device_attr_uniq.attr, 763 &class_device_attr_modalias.attr, 764 NULL 765 }; 766 767 static struct attribute_group input_dev_attr_group = { 768 .attrs = input_dev_attrs, 769 }; 770 771 #define INPUT_DEV_ID_ATTR(name) \ 772 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \ 773 { \ 774 struct input_dev *input_dev = to_input_dev(dev); \ 775 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ 776 } \ 777 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL); 778 779 INPUT_DEV_ID_ATTR(bustype); 780 INPUT_DEV_ID_ATTR(vendor); 781 INPUT_DEV_ID_ATTR(product); 782 INPUT_DEV_ID_ATTR(version); 783 784 static struct attribute *input_dev_id_attrs[] = { 785 &class_device_attr_bustype.attr, 786 &class_device_attr_vendor.attr, 787 &class_device_attr_product.attr, 788 &class_device_attr_version.attr, 789 NULL 790 }; 791 792 static struct attribute_group input_dev_id_attr_group = { 793 .name = "id", 794 .attrs = input_dev_id_attrs, 795 }; 796 797 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, 798 int max, int add_cr) 799 { 800 int i; 801 int len = 0; 802 803 for (i = NBITS(max) - 1; i > 0; i--) 804 if (bitmap[i]) 805 break; 806 807 for (; i >= 0; i--) 808 len += snprintf(buf + len, max(buf_size - len, 0), 809 "%lx%s", bitmap[i], i > 0 ? " " : ""); 810 811 if (add_cr) 812 len += snprintf(buf + len, max(buf_size - len, 0), "\n"); 813 814 return len; 815 } 816 817 #define INPUT_DEV_CAP_ATTR(ev, bm) \ 818 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \ 819 { \ 820 struct input_dev *input_dev = to_input_dev(dev); \ 821 int len = input_print_bitmap(buf, PAGE_SIZE, \ 822 input_dev->bm##bit, ev##_MAX, 1); \ 823 return min_t(int, len, PAGE_SIZE); \ 824 } \ 825 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL); 826 827 INPUT_DEV_CAP_ATTR(EV, ev); 828 INPUT_DEV_CAP_ATTR(KEY, key); 829 INPUT_DEV_CAP_ATTR(REL, rel); 830 INPUT_DEV_CAP_ATTR(ABS, abs); 831 INPUT_DEV_CAP_ATTR(MSC, msc); 832 INPUT_DEV_CAP_ATTR(LED, led); 833 INPUT_DEV_CAP_ATTR(SND, snd); 834 INPUT_DEV_CAP_ATTR(FF, ff); 835 INPUT_DEV_CAP_ATTR(SW, sw); 836 837 static struct attribute *input_dev_caps_attrs[] = { 838 &class_device_attr_ev.attr, 839 &class_device_attr_key.attr, 840 &class_device_attr_rel.attr, 841 &class_device_attr_abs.attr, 842 &class_device_attr_msc.attr, 843 &class_device_attr_led.attr, 844 &class_device_attr_snd.attr, 845 &class_device_attr_ff.attr, 846 &class_device_attr_sw.attr, 847 NULL 848 }; 849 850 static struct attribute_group input_dev_caps_attr_group = { 851 .name = "capabilities", 852 .attrs = input_dev_caps_attrs, 853 }; 854 855 static struct attribute_group *input_dev_attr_groups[] = { 856 &input_dev_attr_group, 857 &input_dev_id_attr_group, 858 &input_dev_caps_attr_group, 859 NULL 860 }; 861 862 static void input_dev_release(struct class_device *class_dev) 863 { 864 struct input_dev *dev = to_input_dev(class_dev); 865 866 input_ff_destroy(dev); 867 kfree(dev); 868 869 module_put(THIS_MODULE); 870 } 871 872 /* 873 * Input uevent interface - loading event handlers based on 874 * device bitfields. 875 */ 876 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index, 877 char *buffer, int buffer_size, int *cur_len, 878 const char *name, unsigned long *bitmap, int max) 879 { 880 if (*cur_index >= num_envp - 1) 881 return -ENOMEM; 882 883 envp[*cur_index] = buffer + *cur_len; 884 885 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name); 886 if (*cur_len >= buffer_size) 887 return -ENOMEM; 888 889 *cur_len += input_print_bitmap(buffer + *cur_len, 890 max(buffer_size - *cur_len, 0), 891 bitmap, max, 0) + 1; 892 if (*cur_len > buffer_size) 893 return -ENOMEM; 894 895 (*cur_index)++; 896 return 0; 897 } 898 899 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index, 900 char *buffer, int buffer_size, int *cur_len, 901 struct input_dev *dev) 902 { 903 if (*cur_index >= num_envp - 1) 904 return -ENOMEM; 905 906 envp[*cur_index] = buffer + *cur_len; 907 908 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), 909 "MODALIAS="); 910 if (*cur_len >= buffer_size) 911 return -ENOMEM; 912 913 *cur_len += input_print_modalias(buffer + *cur_len, 914 max(buffer_size - *cur_len, 0), 915 dev, 0) + 1; 916 if (*cur_len > buffer_size) 917 return -ENOMEM; 918 919 (*cur_index)++; 920 return 0; 921 } 922 923 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ 924 do { \ 925 int err = add_uevent_var(envp, num_envp, &i, \ 926 buffer, buffer_size, &len, \ 927 fmt, val); \ 928 if (err) \ 929 return err; \ 930 } while (0) 931 932 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ 933 do { \ 934 int err = input_add_uevent_bm_var(envp, num_envp, &i, \ 935 buffer, buffer_size, &len, \ 936 name, bm, max); \ 937 if (err) \ 938 return err; \ 939 } while (0) 940 941 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ 942 do { \ 943 int err = input_add_uevent_modalias_var(envp, \ 944 num_envp, &i, \ 945 buffer, buffer_size, &len, \ 946 dev); \ 947 if (err) \ 948 return err; \ 949 } while (0) 950 951 static int input_dev_uevent(struct class_device *cdev, char **envp, 952 int num_envp, char *buffer, int buffer_size) 953 { 954 struct input_dev *dev = to_input_dev(cdev); 955 int i = 0; 956 int len = 0; 957 958 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", 959 dev->id.bustype, dev->id.vendor, 960 dev->id.product, dev->id.version); 961 if (dev->name) 962 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); 963 if (dev->phys) 964 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); 965 if (dev->uniq) 966 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); 967 968 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); 969 if (test_bit(EV_KEY, dev->evbit)) 970 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); 971 if (test_bit(EV_REL, dev->evbit)) 972 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); 973 if (test_bit(EV_ABS, dev->evbit)) 974 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); 975 if (test_bit(EV_MSC, dev->evbit)) 976 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); 977 if (test_bit(EV_LED, dev->evbit)) 978 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); 979 if (test_bit(EV_SND, dev->evbit)) 980 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); 981 if (test_bit(EV_FF, dev->evbit)) 982 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); 983 if (test_bit(EV_SW, dev->evbit)) 984 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); 985 986 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); 987 988 envp[i] = NULL; 989 return 0; 990 } 991 992 struct class input_class = { 993 .name = "input", 994 .release = input_dev_release, 995 .uevent = input_dev_uevent, 996 }; 997 EXPORT_SYMBOL_GPL(input_class); 998 999 /** 1000 * input_allocate_device - allocate memory for new input device 1001 * 1002 * Returns prepared struct input_dev or NULL. 1003 * 1004 * NOTE: Use input_free_device() to free devices that have not been 1005 * registered; input_unregister_device() should be used for already 1006 * registered devices. 1007 */ 1008 struct input_dev *input_allocate_device(void) 1009 { 1010 struct input_dev *dev; 1011 1012 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); 1013 if (dev) { 1014 dev->cdev.class = &input_class; 1015 dev->cdev.groups = input_dev_attr_groups; 1016 class_device_initialize(&dev->cdev); 1017 mutex_init(&dev->mutex); 1018 INIT_LIST_HEAD(&dev->h_list); 1019 INIT_LIST_HEAD(&dev->node); 1020 1021 __module_get(THIS_MODULE); 1022 } 1023 1024 return dev; 1025 } 1026 EXPORT_SYMBOL(input_allocate_device); 1027 1028 /** 1029 * input_free_device - free memory occupied by input_dev structure 1030 * @dev: input device to free 1031 * 1032 * This function should only be used if input_register_device() 1033 * was not called yet or if it failed. Once device was registered 1034 * use input_unregister_device() and memory will be freed once last 1035 * refrence to the device is dropped. 1036 * 1037 * Device should be allocated by input_allocate_device(). 1038 * 1039 * NOTE: If there are references to the input device then memory 1040 * will not be freed until last reference is dropped. 1041 */ 1042 void input_free_device(struct input_dev *dev) 1043 { 1044 if (dev) 1045 input_put_device(dev); 1046 } 1047 EXPORT_SYMBOL(input_free_device); 1048 1049 /** 1050 * input_set_capability - mark device as capable of a certain event 1051 * @dev: device that is capable of emitting or accepting event 1052 * @type: type of the event (EV_KEY, EV_REL, etc...) 1053 * @code: event code 1054 * 1055 * In addition to setting up corresponding bit in appropriate capability 1056 * bitmap the function also adjusts dev->evbit. 1057 */ 1058 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) 1059 { 1060 switch (type) { 1061 case EV_KEY: 1062 __set_bit(code, dev->keybit); 1063 break; 1064 1065 case EV_REL: 1066 __set_bit(code, dev->relbit); 1067 break; 1068 1069 case EV_ABS: 1070 __set_bit(code, dev->absbit); 1071 break; 1072 1073 case EV_MSC: 1074 __set_bit(code, dev->mscbit); 1075 break; 1076 1077 case EV_SW: 1078 __set_bit(code, dev->swbit); 1079 break; 1080 1081 case EV_LED: 1082 __set_bit(code, dev->ledbit); 1083 break; 1084 1085 case EV_SND: 1086 __set_bit(code, dev->sndbit); 1087 break; 1088 1089 case EV_FF: 1090 __set_bit(code, dev->ffbit); 1091 break; 1092 1093 default: 1094 printk(KERN_ERR 1095 "input_set_capability: unknown type %u (code %u)\n", 1096 type, code); 1097 dump_stack(); 1098 return; 1099 } 1100 1101 __set_bit(type, dev->evbit); 1102 } 1103 EXPORT_SYMBOL(input_set_capability); 1104 1105 int input_register_device(struct input_dev *dev) 1106 { 1107 static atomic_t input_no = ATOMIC_INIT(0); 1108 struct input_handler *handler; 1109 const char *path; 1110 int error; 1111 1112 set_bit(EV_SYN, dev->evbit); 1113 1114 /* 1115 * If delay and period are pre-set by the driver, then autorepeating 1116 * is handled by the driver itself and we don't do it in input.c. 1117 */ 1118 1119 init_timer(&dev->timer); 1120 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { 1121 dev->timer.data = (long) dev; 1122 dev->timer.function = input_repeat_key; 1123 dev->rep[REP_DELAY] = 250; 1124 dev->rep[REP_PERIOD] = 33; 1125 } 1126 1127 if (!dev->getkeycode) 1128 dev->getkeycode = input_default_getkeycode; 1129 1130 if (!dev->setkeycode) 1131 dev->setkeycode = input_default_setkeycode; 1132 1133 list_add_tail(&dev->node, &input_dev_list); 1134 1135 snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id), 1136 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1); 1137 1138 if (!dev->cdev.dev) 1139 dev->cdev.dev = dev->dev.parent; 1140 1141 error = class_device_add(&dev->cdev); 1142 if (error) 1143 return error; 1144 1145 path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL); 1146 printk(KERN_INFO "input: %s as %s\n", 1147 dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); 1148 kfree(path); 1149 1150 list_for_each_entry(handler, &input_handler_list, node) 1151 input_attach_handler(dev, handler); 1152 1153 input_wakeup_procfs_readers(); 1154 1155 return 0; 1156 } 1157 EXPORT_SYMBOL(input_register_device); 1158 1159 void input_unregister_device(struct input_dev *dev) 1160 { 1161 struct input_handle *handle, *next; 1162 int code; 1163 1164 for (code = 0; code <= KEY_MAX; code++) 1165 if (test_bit(code, dev->key)) 1166 input_report_key(dev, code, 0); 1167 input_sync(dev); 1168 1169 del_timer_sync(&dev->timer); 1170 1171 list_for_each_entry_safe(handle, next, &dev->h_list, d_node) 1172 handle->handler->disconnect(handle); 1173 WARN_ON(!list_empty(&dev->h_list)); 1174 1175 list_del_init(&dev->node); 1176 1177 class_device_unregister(&dev->cdev); 1178 1179 input_wakeup_procfs_readers(); 1180 } 1181 EXPORT_SYMBOL(input_unregister_device); 1182 1183 int input_register_handler(struct input_handler *handler) 1184 { 1185 struct input_dev *dev; 1186 1187 INIT_LIST_HEAD(&handler->h_list); 1188 1189 if (handler->fops != NULL) { 1190 if (input_table[handler->minor >> 5]) 1191 return -EBUSY; 1192 1193 input_table[handler->minor >> 5] = handler; 1194 } 1195 1196 list_add_tail(&handler->node, &input_handler_list); 1197 1198 list_for_each_entry(dev, &input_dev_list, node) 1199 input_attach_handler(dev, handler); 1200 1201 input_wakeup_procfs_readers(); 1202 return 0; 1203 } 1204 EXPORT_SYMBOL(input_register_handler); 1205 1206 void input_unregister_handler(struct input_handler *handler) 1207 { 1208 struct input_handle *handle, *next; 1209 1210 list_for_each_entry_safe(handle, next, &handler->h_list, h_node) 1211 handler->disconnect(handle); 1212 WARN_ON(!list_empty(&handler->h_list)); 1213 1214 list_del_init(&handler->node); 1215 1216 if (handler->fops != NULL) 1217 input_table[handler->minor >> 5] = NULL; 1218 1219 input_wakeup_procfs_readers(); 1220 } 1221 EXPORT_SYMBOL(input_unregister_handler); 1222 1223 int input_register_handle(struct input_handle *handle) 1224 { 1225 struct input_handler *handler = handle->handler; 1226 1227 list_add_tail(&handle->d_node, &handle->dev->h_list); 1228 list_add_tail(&handle->h_node, &handler->h_list); 1229 1230 if (handler->start) 1231 handler->start(handle); 1232 1233 return 0; 1234 } 1235 EXPORT_SYMBOL(input_register_handle); 1236 1237 void input_unregister_handle(struct input_handle *handle) 1238 { 1239 list_del_init(&handle->h_node); 1240 list_del_init(&handle->d_node); 1241 } 1242 EXPORT_SYMBOL(input_unregister_handle); 1243 1244 static int input_open_file(struct inode *inode, struct file *file) 1245 { 1246 struct input_handler *handler = input_table[iminor(inode) >> 5]; 1247 const struct file_operations *old_fops, *new_fops = NULL; 1248 int err; 1249 1250 /* No load-on-demand here? */ 1251 if (!handler || !(new_fops = fops_get(handler->fops))) 1252 return -ENODEV; 1253 1254 /* 1255 * That's _really_ odd. Usually NULL ->open means "nothing special", 1256 * not "no device". Oh, well... 1257 */ 1258 if (!new_fops->open) { 1259 fops_put(new_fops); 1260 return -ENODEV; 1261 } 1262 old_fops = file->f_op; 1263 file->f_op = new_fops; 1264 1265 err = new_fops->open(inode, file); 1266 1267 if (err) { 1268 fops_put(file->f_op); 1269 file->f_op = fops_get(old_fops); 1270 } 1271 fops_put(old_fops); 1272 return err; 1273 } 1274 1275 static const struct file_operations input_fops = { 1276 .owner = THIS_MODULE, 1277 .open = input_open_file, 1278 }; 1279 1280 static int __init input_init(void) 1281 { 1282 int err; 1283 1284 err = class_register(&input_class); 1285 if (err) { 1286 printk(KERN_ERR "input: unable to register input_dev class\n"); 1287 return err; 1288 } 1289 1290 err = input_proc_init(); 1291 if (err) 1292 goto fail1; 1293 1294 err = register_chrdev(INPUT_MAJOR, "input", &input_fops); 1295 if (err) { 1296 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); 1297 goto fail2; 1298 } 1299 1300 return 0; 1301 1302 fail2: input_proc_exit(); 1303 fail1: class_unregister(&input_class); 1304 return err; 1305 } 1306 1307 static void __exit input_exit(void) 1308 { 1309 input_proc_exit(); 1310 unregister_chrdev(INPUT_MAJOR, "input"); 1311 class_unregister(&input_class); 1312 } 1313 1314 subsys_initcall(input_init); 1315 module_exit(input_exit); 1316