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