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 #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt 14 15 #include <linux/init.h> 16 #include <linux/types.h> 17 #include <linux/input/mt.h> 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 #include <linux/random.h> 21 #include <linux/major.h> 22 #include <linux/proc_fs.h> 23 #include <linux/sched.h> 24 #include <linux/seq_file.h> 25 #include <linux/poll.h> 26 #include <linux/device.h> 27 #include <linux/mutex.h> 28 #include <linux/rcupdate.h> 29 #include "input-compat.h" 30 31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); 32 MODULE_DESCRIPTION("Input core"); 33 MODULE_LICENSE("GPL"); 34 35 #define INPUT_DEVICES 256 36 37 static LIST_HEAD(input_dev_list); 38 static LIST_HEAD(input_handler_list); 39 40 /* 41 * input_mutex protects access to both input_dev_list and input_handler_list. 42 * This also causes input_[un]register_device and input_[un]register_handler 43 * be mutually exclusive which simplifies locking in drivers implementing 44 * input handlers. 45 */ 46 static DEFINE_MUTEX(input_mutex); 47 48 static struct input_handler *input_table[8]; 49 50 static inline int is_event_supported(unsigned int code, 51 unsigned long *bm, unsigned int max) 52 { 53 return code <= max && test_bit(code, bm); 54 } 55 56 static int input_defuzz_abs_event(int value, int old_val, int fuzz) 57 { 58 if (fuzz) { 59 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) 60 return old_val; 61 62 if (value > old_val - fuzz && value < old_val + fuzz) 63 return (old_val * 3 + value) / 4; 64 65 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) 66 return (old_val + value) / 2; 67 } 68 69 return value; 70 } 71 72 /* 73 * Pass event first through all filters and then, if event has not been 74 * filtered out, through all open handles. This function is called with 75 * dev->event_lock held and interrupts disabled. 76 */ 77 static void input_pass_event(struct input_dev *dev, 78 struct input_handler *src_handler, 79 unsigned int type, unsigned int code, int value) 80 { 81 struct input_handler *handler; 82 struct input_handle *handle; 83 84 rcu_read_lock(); 85 86 handle = rcu_dereference(dev->grab); 87 if (handle) 88 handle->handler->event(handle, type, code, value); 89 else { 90 bool filtered = false; 91 92 list_for_each_entry_rcu(handle, &dev->h_list, d_node) { 93 if (!handle->open) 94 continue; 95 96 handler = handle->handler; 97 98 /* 99 * If this is the handler that injected this 100 * particular event we want to skip it to avoid 101 * filters firing again and again. 102 */ 103 if (handler == src_handler) 104 continue; 105 106 if (!handler->filter) { 107 if (filtered) 108 break; 109 110 handler->event(handle, type, code, value); 111 112 } else if (handler->filter(handle, type, code, value)) 113 filtered = true; 114 } 115 } 116 117 rcu_read_unlock(); 118 } 119 120 /* 121 * Generate software autorepeat event. Note that we take 122 * dev->event_lock here to avoid racing with input_event 123 * which may cause keys get "stuck". 124 */ 125 static void input_repeat_key(unsigned long data) 126 { 127 struct input_dev *dev = (void *) data; 128 unsigned long flags; 129 130 spin_lock_irqsave(&dev->event_lock, flags); 131 132 if (test_bit(dev->repeat_key, dev->key) && 133 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { 134 135 input_pass_event(dev, NULL, EV_KEY, dev->repeat_key, 2); 136 137 if (dev->sync) { 138 /* 139 * Only send SYN_REPORT if we are not in a middle 140 * of driver parsing a new hardware packet. 141 * Otherwise assume that the driver will send 142 * SYN_REPORT once it's done. 143 */ 144 input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); 145 } 146 147 if (dev->rep[REP_PERIOD]) 148 mod_timer(&dev->timer, jiffies + 149 msecs_to_jiffies(dev->rep[REP_PERIOD])); 150 } 151 152 spin_unlock_irqrestore(&dev->event_lock, flags); 153 } 154 155 static void input_start_autorepeat(struct input_dev *dev, int code) 156 { 157 if (test_bit(EV_REP, dev->evbit) && 158 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && 159 dev->timer.data) { 160 dev->repeat_key = code; 161 mod_timer(&dev->timer, 162 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); 163 } 164 } 165 166 static void input_stop_autorepeat(struct input_dev *dev) 167 { 168 del_timer(&dev->timer); 169 } 170 171 #define INPUT_IGNORE_EVENT 0 172 #define INPUT_PASS_TO_HANDLERS 1 173 #define INPUT_PASS_TO_DEVICE 2 174 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) 175 176 static int input_handle_abs_event(struct input_dev *dev, 177 struct input_handler *src_handler, 178 unsigned int code, int *pval) 179 { 180 bool is_mt_event; 181 int *pold; 182 183 if (code == ABS_MT_SLOT) { 184 /* 185 * "Stage" the event; we'll flush it later, when we 186 * get actual touch data. 187 */ 188 if (*pval >= 0 && *pval < dev->mtsize) 189 dev->slot = *pval; 190 191 return INPUT_IGNORE_EVENT; 192 } 193 194 is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST; 195 196 if (!is_mt_event) { 197 pold = &dev->absinfo[code].value; 198 } else if (dev->mt) { 199 struct input_mt_slot *mtslot = &dev->mt[dev->slot]; 200 pold = &mtslot->abs[code - ABS_MT_FIRST]; 201 } else { 202 /* 203 * Bypass filtering for multi-touch events when 204 * not employing slots. 205 */ 206 pold = NULL; 207 } 208 209 if (pold) { 210 *pval = input_defuzz_abs_event(*pval, *pold, 211 dev->absinfo[code].fuzz); 212 if (*pold == *pval) 213 return INPUT_IGNORE_EVENT; 214 215 *pold = *pval; 216 } 217 218 /* Flush pending "slot" event */ 219 if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { 220 input_abs_set_val(dev, ABS_MT_SLOT, dev->slot); 221 input_pass_event(dev, src_handler, 222 EV_ABS, ABS_MT_SLOT, dev->slot); 223 } 224 225 return INPUT_PASS_TO_HANDLERS; 226 } 227 228 static void input_handle_event(struct input_dev *dev, 229 struct input_handler *src_handler, 230 unsigned int type, unsigned int code, int value) 231 { 232 int disposition = INPUT_IGNORE_EVENT; 233 234 switch (type) { 235 236 case EV_SYN: 237 switch (code) { 238 case SYN_CONFIG: 239 disposition = INPUT_PASS_TO_ALL; 240 break; 241 242 case SYN_REPORT: 243 if (!dev->sync) { 244 dev->sync = true; 245 disposition = INPUT_PASS_TO_HANDLERS; 246 } 247 break; 248 case SYN_MT_REPORT: 249 dev->sync = false; 250 disposition = INPUT_PASS_TO_HANDLERS; 251 break; 252 } 253 break; 254 255 case EV_KEY: 256 if (is_event_supported(code, dev->keybit, KEY_MAX) && 257 !!test_bit(code, dev->key) != value) { 258 259 if (value != 2) { 260 __change_bit(code, dev->key); 261 if (value) 262 input_start_autorepeat(dev, code); 263 else 264 input_stop_autorepeat(dev); 265 } 266 267 disposition = INPUT_PASS_TO_HANDLERS; 268 } 269 break; 270 271 case EV_SW: 272 if (is_event_supported(code, dev->swbit, SW_MAX) && 273 !!test_bit(code, dev->sw) != value) { 274 275 __change_bit(code, dev->sw); 276 disposition = INPUT_PASS_TO_HANDLERS; 277 } 278 break; 279 280 case EV_ABS: 281 if (is_event_supported(code, dev->absbit, ABS_MAX)) 282 disposition = input_handle_abs_event(dev, src_handler, 283 code, &value); 284 285 break; 286 287 case EV_REL: 288 if (is_event_supported(code, dev->relbit, REL_MAX) && value) 289 disposition = INPUT_PASS_TO_HANDLERS; 290 291 break; 292 293 case EV_MSC: 294 if (is_event_supported(code, dev->mscbit, MSC_MAX)) 295 disposition = INPUT_PASS_TO_ALL; 296 297 break; 298 299 case EV_LED: 300 if (is_event_supported(code, dev->ledbit, LED_MAX) && 301 !!test_bit(code, dev->led) != value) { 302 303 __change_bit(code, dev->led); 304 disposition = INPUT_PASS_TO_ALL; 305 } 306 break; 307 308 case EV_SND: 309 if (is_event_supported(code, dev->sndbit, SND_MAX)) { 310 311 if (!!test_bit(code, dev->snd) != !!value) 312 __change_bit(code, dev->snd); 313 disposition = INPUT_PASS_TO_ALL; 314 } 315 break; 316 317 case EV_REP: 318 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { 319 dev->rep[code] = value; 320 disposition = INPUT_PASS_TO_ALL; 321 } 322 break; 323 324 case EV_FF: 325 if (value >= 0) 326 disposition = INPUT_PASS_TO_ALL; 327 break; 328 329 case EV_PWR: 330 disposition = INPUT_PASS_TO_ALL; 331 break; 332 } 333 334 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) 335 dev->sync = false; 336 337 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) 338 dev->event(dev, type, code, value); 339 340 if (disposition & INPUT_PASS_TO_HANDLERS) 341 input_pass_event(dev, src_handler, type, code, value); 342 } 343 344 /** 345 * input_event() - report new input event 346 * @dev: device that generated the event 347 * @type: type of the event 348 * @code: event code 349 * @value: value of the event 350 * 351 * This function should be used by drivers implementing various input 352 * devices to report input events. See also input_inject_event(). 353 * 354 * NOTE: input_event() may be safely used right after input device was 355 * allocated with input_allocate_device(), even before it is registered 356 * with input_register_device(), but the event will not reach any of the 357 * input handlers. Such early invocation of input_event() may be used 358 * to 'seed' initial state of a switch or initial position of absolute 359 * axis, etc. 360 */ 361 void input_event(struct input_dev *dev, 362 unsigned int type, unsigned int code, int value) 363 { 364 unsigned long flags; 365 366 if (is_event_supported(type, dev->evbit, EV_MAX)) { 367 368 spin_lock_irqsave(&dev->event_lock, flags); 369 add_input_randomness(type, code, value); 370 input_handle_event(dev, NULL, type, code, value); 371 spin_unlock_irqrestore(&dev->event_lock, flags); 372 } 373 } 374 EXPORT_SYMBOL(input_event); 375 376 /** 377 * input_inject_event() - send input event from input handler 378 * @handle: input handle to send event through 379 * @type: type of the event 380 * @code: event code 381 * @value: value of the event 382 * 383 * Similar to input_event() but will ignore event if device is 384 * "grabbed" and handle injecting event is not the one that owns 385 * the device. 386 */ 387 void input_inject_event(struct input_handle *handle, 388 unsigned int type, unsigned int code, int value) 389 { 390 struct input_dev *dev = handle->dev; 391 struct input_handle *grab; 392 unsigned long flags; 393 394 if (is_event_supported(type, dev->evbit, EV_MAX)) { 395 spin_lock_irqsave(&dev->event_lock, flags); 396 397 rcu_read_lock(); 398 grab = rcu_dereference(dev->grab); 399 if (!grab || grab == handle) 400 input_handle_event(dev, handle->handler, 401 type, code, value); 402 rcu_read_unlock(); 403 404 spin_unlock_irqrestore(&dev->event_lock, flags); 405 } 406 } 407 EXPORT_SYMBOL(input_inject_event); 408 409 /** 410 * input_alloc_absinfo - allocates array of input_absinfo structs 411 * @dev: the input device emitting absolute events 412 * 413 * If the absinfo struct the caller asked for is already allocated, this 414 * functions will not do anything. 415 */ 416 void input_alloc_absinfo(struct input_dev *dev) 417 { 418 if (!dev->absinfo) 419 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), 420 GFP_KERNEL); 421 422 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); 423 } 424 EXPORT_SYMBOL(input_alloc_absinfo); 425 426 void input_set_abs_params(struct input_dev *dev, unsigned int axis, 427 int min, int max, int fuzz, int flat) 428 { 429 struct input_absinfo *absinfo; 430 431 input_alloc_absinfo(dev); 432 if (!dev->absinfo) 433 return; 434 435 absinfo = &dev->absinfo[axis]; 436 absinfo->minimum = min; 437 absinfo->maximum = max; 438 absinfo->fuzz = fuzz; 439 absinfo->flat = flat; 440 441 dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); 442 } 443 EXPORT_SYMBOL(input_set_abs_params); 444 445 446 /** 447 * input_grab_device - grabs device for exclusive use 448 * @handle: input handle that wants to own the device 449 * 450 * When a device is grabbed by an input handle all events generated by 451 * the device are delivered only to this handle. Also events injected 452 * by other input handles are ignored while device is grabbed. 453 */ 454 int input_grab_device(struct input_handle *handle) 455 { 456 struct input_dev *dev = handle->dev; 457 int retval; 458 459 retval = mutex_lock_interruptible(&dev->mutex); 460 if (retval) 461 return retval; 462 463 if (dev->grab) { 464 retval = -EBUSY; 465 goto out; 466 } 467 468 rcu_assign_pointer(dev->grab, handle); 469 synchronize_rcu(); 470 471 out: 472 mutex_unlock(&dev->mutex); 473 return retval; 474 } 475 EXPORT_SYMBOL(input_grab_device); 476 477 static void __input_release_device(struct input_handle *handle) 478 { 479 struct input_dev *dev = handle->dev; 480 481 if (dev->grab == handle) { 482 rcu_assign_pointer(dev->grab, NULL); 483 /* Make sure input_pass_event() notices that grab is gone */ 484 synchronize_rcu(); 485 486 list_for_each_entry(handle, &dev->h_list, d_node) 487 if (handle->open && handle->handler->start) 488 handle->handler->start(handle); 489 } 490 } 491 492 /** 493 * input_release_device - release previously grabbed device 494 * @handle: input handle that owns the device 495 * 496 * Releases previously grabbed device so that other input handles can 497 * start receiving input events. Upon release all handlers attached 498 * to the device have their start() method called so they have a change 499 * to synchronize device state with the rest of the system. 500 */ 501 void input_release_device(struct input_handle *handle) 502 { 503 struct input_dev *dev = handle->dev; 504 505 mutex_lock(&dev->mutex); 506 __input_release_device(handle); 507 mutex_unlock(&dev->mutex); 508 } 509 EXPORT_SYMBOL(input_release_device); 510 511 /** 512 * input_open_device - open input device 513 * @handle: handle through which device is being accessed 514 * 515 * This function should be called by input handlers when they 516 * want to start receive events from given input device. 517 */ 518 int input_open_device(struct input_handle *handle) 519 { 520 struct input_dev *dev = handle->dev; 521 int retval; 522 523 retval = mutex_lock_interruptible(&dev->mutex); 524 if (retval) 525 return retval; 526 527 if (dev->going_away) { 528 retval = -ENODEV; 529 goto out; 530 } 531 532 handle->open++; 533 534 if (!dev->users++ && dev->open) 535 retval = dev->open(dev); 536 537 if (retval) { 538 dev->users--; 539 if (!--handle->open) { 540 /* 541 * Make sure we are not delivering any more events 542 * through this handle 543 */ 544 synchronize_rcu(); 545 } 546 } 547 548 out: 549 mutex_unlock(&dev->mutex); 550 return retval; 551 } 552 EXPORT_SYMBOL(input_open_device); 553 554 int input_flush_device(struct input_handle *handle, struct file *file) 555 { 556 struct input_dev *dev = handle->dev; 557 int retval; 558 559 retval = mutex_lock_interruptible(&dev->mutex); 560 if (retval) 561 return retval; 562 563 if (dev->flush) 564 retval = dev->flush(dev, file); 565 566 mutex_unlock(&dev->mutex); 567 return retval; 568 } 569 EXPORT_SYMBOL(input_flush_device); 570 571 /** 572 * input_close_device - close input device 573 * @handle: handle through which device is being accessed 574 * 575 * This function should be called by input handlers when they 576 * want to stop receive events from given input device. 577 */ 578 void input_close_device(struct input_handle *handle) 579 { 580 struct input_dev *dev = handle->dev; 581 582 mutex_lock(&dev->mutex); 583 584 __input_release_device(handle); 585 586 if (!--dev->users && dev->close) 587 dev->close(dev); 588 589 if (!--handle->open) { 590 /* 591 * synchronize_rcu() makes sure that input_pass_event() 592 * completed and that no more input events are delivered 593 * through this handle 594 */ 595 synchronize_rcu(); 596 } 597 598 mutex_unlock(&dev->mutex); 599 } 600 EXPORT_SYMBOL(input_close_device); 601 602 /* 603 * Simulate keyup events for all keys that are marked as pressed. 604 * The function must be called with dev->event_lock held. 605 */ 606 static void input_dev_release_keys(struct input_dev *dev) 607 { 608 int code; 609 610 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { 611 for (code = 0; code <= KEY_MAX; code++) { 612 if (is_event_supported(code, dev->keybit, KEY_MAX) && 613 __test_and_clear_bit(code, dev->key)) { 614 input_pass_event(dev, NULL, EV_KEY, code, 0); 615 } 616 } 617 input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); 618 } 619 } 620 621 /* 622 * Prepare device for unregistering 623 */ 624 static void input_disconnect_device(struct input_dev *dev) 625 { 626 struct input_handle *handle; 627 628 /* 629 * Mark device as going away. Note that we take dev->mutex here 630 * not to protect access to dev->going_away but rather to ensure 631 * that there are no threads in the middle of input_open_device() 632 */ 633 mutex_lock(&dev->mutex); 634 dev->going_away = true; 635 mutex_unlock(&dev->mutex); 636 637 spin_lock_irq(&dev->event_lock); 638 639 /* 640 * Simulate keyup events for all pressed keys so that handlers 641 * are not left with "stuck" keys. The driver may continue 642 * generate events even after we done here but they will not 643 * reach any handlers. 644 */ 645 input_dev_release_keys(dev); 646 647 list_for_each_entry(handle, &dev->h_list, d_node) 648 handle->open = 0; 649 650 spin_unlock_irq(&dev->event_lock); 651 } 652 653 /** 654 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry 655 * @ke: keymap entry containing scancode to be converted. 656 * @scancode: pointer to the location where converted scancode should 657 * be stored. 658 * 659 * This function is used to convert scancode stored in &struct keymap_entry 660 * into scalar form understood by legacy keymap handling methods. These 661 * methods expect scancodes to be represented as 'unsigned int'. 662 */ 663 int input_scancode_to_scalar(const struct input_keymap_entry *ke, 664 unsigned int *scancode) 665 { 666 switch (ke->len) { 667 case 1: 668 *scancode = *((u8 *)ke->scancode); 669 break; 670 671 case 2: 672 *scancode = *((u16 *)ke->scancode); 673 break; 674 675 case 4: 676 *scancode = *((u32 *)ke->scancode); 677 break; 678 679 default: 680 return -EINVAL; 681 } 682 683 return 0; 684 } 685 EXPORT_SYMBOL(input_scancode_to_scalar); 686 687 /* 688 * Those routines handle the default case where no [gs]etkeycode() is 689 * defined. In this case, an array indexed by the scancode is used. 690 */ 691 692 static unsigned int input_fetch_keycode(struct input_dev *dev, 693 unsigned int index) 694 { 695 switch (dev->keycodesize) { 696 case 1: 697 return ((u8 *)dev->keycode)[index]; 698 699 case 2: 700 return ((u16 *)dev->keycode)[index]; 701 702 default: 703 return ((u32 *)dev->keycode)[index]; 704 } 705 } 706 707 static int input_default_getkeycode(struct input_dev *dev, 708 struct input_keymap_entry *ke) 709 { 710 unsigned int index; 711 int error; 712 713 if (!dev->keycodesize) 714 return -EINVAL; 715 716 if (ke->flags & INPUT_KEYMAP_BY_INDEX) 717 index = ke->index; 718 else { 719 error = input_scancode_to_scalar(ke, &index); 720 if (error) 721 return error; 722 } 723 724 if (index >= dev->keycodemax) 725 return -EINVAL; 726 727 ke->keycode = input_fetch_keycode(dev, index); 728 ke->index = index; 729 ke->len = sizeof(index); 730 memcpy(ke->scancode, &index, sizeof(index)); 731 732 return 0; 733 } 734 735 static int input_default_setkeycode(struct input_dev *dev, 736 const struct input_keymap_entry *ke, 737 unsigned int *old_keycode) 738 { 739 unsigned int index; 740 int error; 741 int i; 742 743 if (!dev->keycodesize) 744 return -EINVAL; 745 746 if (ke->flags & INPUT_KEYMAP_BY_INDEX) { 747 index = ke->index; 748 } else { 749 error = input_scancode_to_scalar(ke, &index); 750 if (error) 751 return error; 752 } 753 754 if (index >= dev->keycodemax) 755 return -EINVAL; 756 757 if (dev->keycodesize < sizeof(ke->keycode) && 758 (ke->keycode >> (dev->keycodesize * 8))) 759 return -EINVAL; 760 761 switch (dev->keycodesize) { 762 case 1: { 763 u8 *k = (u8 *)dev->keycode; 764 *old_keycode = k[index]; 765 k[index] = ke->keycode; 766 break; 767 } 768 case 2: { 769 u16 *k = (u16 *)dev->keycode; 770 *old_keycode = k[index]; 771 k[index] = ke->keycode; 772 break; 773 } 774 default: { 775 u32 *k = (u32 *)dev->keycode; 776 *old_keycode = k[index]; 777 k[index] = ke->keycode; 778 break; 779 } 780 } 781 782 __clear_bit(*old_keycode, dev->keybit); 783 __set_bit(ke->keycode, dev->keybit); 784 785 for (i = 0; i < dev->keycodemax; i++) { 786 if (input_fetch_keycode(dev, i) == *old_keycode) { 787 __set_bit(*old_keycode, dev->keybit); 788 break; /* Setting the bit twice is useless, so break */ 789 } 790 } 791 792 return 0; 793 } 794 795 /** 796 * input_get_keycode - retrieve keycode currently mapped to a given scancode 797 * @dev: input device which keymap is being queried 798 * @ke: keymap entry 799 * 800 * This function should be called by anyone interested in retrieving current 801 * keymap. Presently evdev handlers use it. 802 */ 803 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) 804 { 805 unsigned long flags; 806 int retval; 807 808 spin_lock_irqsave(&dev->event_lock, flags); 809 810 if (dev->getkeycode) { 811 /* 812 * Support for legacy drivers, that don't implement the new 813 * ioctls 814 */ 815 u32 scancode = ke->index; 816 817 memcpy(ke->scancode, &scancode, sizeof(scancode)); 818 ke->len = sizeof(scancode); 819 retval = dev->getkeycode(dev, scancode, &ke->keycode); 820 } else { 821 retval = dev->getkeycode_new(dev, ke); 822 } 823 824 spin_unlock_irqrestore(&dev->event_lock, flags); 825 return retval; 826 } 827 EXPORT_SYMBOL(input_get_keycode); 828 829 /** 830 * input_set_keycode - attribute a keycode to a given scancode 831 * @dev: input device which keymap is being updated 832 * @ke: new keymap entry 833 * 834 * This function should be called by anyone needing to update current 835 * keymap. Presently keyboard and evdev handlers use it. 836 */ 837 int input_set_keycode(struct input_dev *dev, 838 const struct input_keymap_entry *ke) 839 { 840 unsigned long flags; 841 unsigned int old_keycode; 842 int retval; 843 844 if (ke->keycode > KEY_MAX) 845 return -EINVAL; 846 847 spin_lock_irqsave(&dev->event_lock, flags); 848 849 if (dev->setkeycode) { 850 /* 851 * Support for legacy drivers, that don't implement the new 852 * ioctls 853 */ 854 unsigned int scancode; 855 856 retval = input_scancode_to_scalar(ke, &scancode); 857 if (retval) 858 goto out; 859 860 /* 861 * We need to know the old scancode, in order to generate a 862 * keyup effect, if the set operation happens successfully 863 */ 864 if (!dev->getkeycode) { 865 retval = -EINVAL; 866 goto out; 867 } 868 869 retval = dev->getkeycode(dev, scancode, &old_keycode); 870 if (retval) 871 goto out; 872 873 retval = dev->setkeycode(dev, scancode, ke->keycode); 874 } else { 875 retval = dev->setkeycode_new(dev, ke, &old_keycode); 876 } 877 878 if (retval) 879 goto out; 880 881 /* Make sure KEY_RESERVED did not get enabled. */ 882 __clear_bit(KEY_RESERVED, dev->keybit); 883 884 /* 885 * Simulate keyup event if keycode is not present 886 * in the keymap anymore 887 */ 888 if (test_bit(EV_KEY, dev->evbit) && 889 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && 890 __test_and_clear_bit(old_keycode, dev->key)) { 891 892 input_pass_event(dev, NULL, EV_KEY, old_keycode, 0); 893 if (dev->sync) 894 input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); 895 } 896 897 out: 898 spin_unlock_irqrestore(&dev->event_lock, flags); 899 900 return retval; 901 } 902 EXPORT_SYMBOL(input_set_keycode); 903 904 #define MATCH_BIT(bit, max) \ 905 for (i = 0; i < BITS_TO_LONGS(max); i++) \ 906 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ 907 break; \ 908 if (i != BITS_TO_LONGS(max)) \ 909 continue; 910 911 static const struct input_device_id *input_match_device(struct input_handler *handler, 912 struct input_dev *dev) 913 { 914 const struct input_device_id *id; 915 int i; 916 917 for (id = handler->id_table; id->flags || id->driver_info; id++) { 918 919 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) 920 if (id->bustype != dev->id.bustype) 921 continue; 922 923 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) 924 if (id->vendor != dev->id.vendor) 925 continue; 926 927 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) 928 if (id->product != dev->id.product) 929 continue; 930 931 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) 932 if (id->version != dev->id.version) 933 continue; 934 935 MATCH_BIT(evbit, EV_MAX); 936 MATCH_BIT(keybit, KEY_MAX); 937 MATCH_BIT(relbit, REL_MAX); 938 MATCH_BIT(absbit, ABS_MAX); 939 MATCH_BIT(mscbit, MSC_MAX); 940 MATCH_BIT(ledbit, LED_MAX); 941 MATCH_BIT(sndbit, SND_MAX); 942 MATCH_BIT(ffbit, FF_MAX); 943 MATCH_BIT(swbit, SW_MAX); 944 945 if (!handler->match || handler->match(handler, dev)) 946 return id; 947 } 948 949 return NULL; 950 } 951 952 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) 953 { 954 const struct input_device_id *id; 955 int error; 956 957 id = input_match_device(handler, dev); 958 if (!id) 959 return -ENODEV; 960 961 error = handler->connect(handler, dev, id); 962 if (error && error != -ENODEV) 963 pr_err("failed to attach handler %s to device %s, error: %d\n", 964 handler->name, kobject_name(&dev->dev.kobj), error); 965 966 return error; 967 } 968 969 #ifdef CONFIG_COMPAT 970 971 static int input_bits_to_string(char *buf, int buf_size, 972 unsigned long bits, bool skip_empty) 973 { 974 int len = 0; 975 976 if (INPUT_COMPAT_TEST) { 977 u32 dword = bits >> 32; 978 if (dword || !skip_empty) 979 len += snprintf(buf, buf_size, "%x ", dword); 980 981 dword = bits & 0xffffffffUL; 982 if (dword || !skip_empty || len) 983 len += snprintf(buf + len, max(buf_size - len, 0), 984 "%x", dword); 985 } else { 986 if (bits || !skip_empty) 987 len += snprintf(buf, buf_size, "%lx", bits); 988 } 989 990 return len; 991 } 992 993 #else /* !CONFIG_COMPAT */ 994 995 static int input_bits_to_string(char *buf, int buf_size, 996 unsigned long bits, bool skip_empty) 997 { 998 return bits || !skip_empty ? 999 snprintf(buf, buf_size, "%lx", bits) : 0; 1000 } 1001 1002 #endif 1003 1004 #ifdef CONFIG_PROC_FS 1005 1006 static struct proc_dir_entry *proc_bus_input_dir; 1007 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); 1008 static int input_devices_state; 1009 1010 static inline void input_wakeup_procfs_readers(void) 1011 { 1012 input_devices_state++; 1013 wake_up(&input_devices_poll_wait); 1014 } 1015 1016 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) 1017 { 1018 poll_wait(file, &input_devices_poll_wait, wait); 1019 if (file->f_version != input_devices_state) { 1020 file->f_version = input_devices_state; 1021 return POLLIN | POLLRDNORM; 1022 } 1023 1024 return 0; 1025 } 1026 1027 union input_seq_state { 1028 struct { 1029 unsigned short pos; 1030 bool mutex_acquired; 1031 }; 1032 void *p; 1033 }; 1034 1035 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) 1036 { 1037 union input_seq_state *state = (union input_seq_state *)&seq->private; 1038 int error; 1039 1040 /* We need to fit into seq->private pointer */ 1041 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); 1042 1043 error = mutex_lock_interruptible(&input_mutex); 1044 if (error) { 1045 state->mutex_acquired = false; 1046 return ERR_PTR(error); 1047 } 1048 1049 state->mutex_acquired = true; 1050 1051 return seq_list_start(&input_dev_list, *pos); 1052 } 1053 1054 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1055 { 1056 return seq_list_next(v, &input_dev_list, pos); 1057 } 1058 1059 static void input_seq_stop(struct seq_file *seq, void *v) 1060 { 1061 union input_seq_state *state = (union input_seq_state *)&seq->private; 1062 1063 if (state->mutex_acquired) 1064 mutex_unlock(&input_mutex); 1065 } 1066 1067 static void input_seq_print_bitmap(struct seq_file *seq, const char *name, 1068 unsigned long *bitmap, int max) 1069 { 1070 int i; 1071 bool skip_empty = true; 1072 char buf[18]; 1073 1074 seq_printf(seq, "B: %s=", name); 1075 1076 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { 1077 if (input_bits_to_string(buf, sizeof(buf), 1078 bitmap[i], skip_empty)) { 1079 skip_empty = false; 1080 seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); 1081 } 1082 } 1083 1084 /* 1085 * If no output was produced print a single 0. 1086 */ 1087 if (skip_empty) 1088 seq_puts(seq, "0"); 1089 1090 seq_putc(seq, '\n'); 1091 } 1092 1093 static int input_devices_seq_show(struct seq_file *seq, void *v) 1094 { 1095 struct input_dev *dev = container_of(v, struct input_dev, node); 1096 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); 1097 struct input_handle *handle; 1098 1099 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", 1100 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); 1101 1102 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); 1103 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); 1104 seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); 1105 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); 1106 seq_printf(seq, "H: Handlers="); 1107 1108 list_for_each_entry(handle, &dev->h_list, d_node) 1109 seq_printf(seq, "%s ", handle->name); 1110 seq_putc(seq, '\n'); 1111 1112 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); 1113 1114 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); 1115 if (test_bit(EV_KEY, dev->evbit)) 1116 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); 1117 if (test_bit(EV_REL, dev->evbit)) 1118 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); 1119 if (test_bit(EV_ABS, dev->evbit)) 1120 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); 1121 if (test_bit(EV_MSC, dev->evbit)) 1122 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); 1123 if (test_bit(EV_LED, dev->evbit)) 1124 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); 1125 if (test_bit(EV_SND, dev->evbit)) 1126 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); 1127 if (test_bit(EV_FF, dev->evbit)) 1128 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); 1129 if (test_bit(EV_SW, dev->evbit)) 1130 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); 1131 1132 seq_putc(seq, '\n'); 1133 1134 kfree(path); 1135 return 0; 1136 } 1137 1138 static const struct seq_operations input_devices_seq_ops = { 1139 .start = input_devices_seq_start, 1140 .next = input_devices_seq_next, 1141 .stop = input_seq_stop, 1142 .show = input_devices_seq_show, 1143 }; 1144 1145 static int input_proc_devices_open(struct inode *inode, struct file *file) 1146 { 1147 return seq_open(file, &input_devices_seq_ops); 1148 } 1149 1150 static const struct file_operations input_devices_fileops = { 1151 .owner = THIS_MODULE, 1152 .open = input_proc_devices_open, 1153 .poll = input_proc_devices_poll, 1154 .read = seq_read, 1155 .llseek = seq_lseek, 1156 .release = seq_release, 1157 }; 1158 1159 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) 1160 { 1161 union input_seq_state *state = (union input_seq_state *)&seq->private; 1162 int error; 1163 1164 /* We need to fit into seq->private pointer */ 1165 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); 1166 1167 error = mutex_lock_interruptible(&input_mutex); 1168 if (error) { 1169 state->mutex_acquired = false; 1170 return ERR_PTR(error); 1171 } 1172 1173 state->mutex_acquired = true; 1174 state->pos = *pos; 1175 1176 return seq_list_start(&input_handler_list, *pos); 1177 } 1178 1179 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1180 { 1181 union input_seq_state *state = (union input_seq_state *)&seq->private; 1182 1183 state->pos = *pos + 1; 1184 return seq_list_next(v, &input_handler_list, pos); 1185 } 1186 1187 static int input_handlers_seq_show(struct seq_file *seq, void *v) 1188 { 1189 struct input_handler *handler = container_of(v, struct input_handler, node); 1190 union input_seq_state *state = (union input_seq_state *)&seq->private; 1191 1192 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); 1193 if (handler->filter) 1194 seq_puts(seq, " (filter)"); 1195 if (handler->fops) 1196 seq_printf(seq, " Minor=%d", handler->minor); 1197 seq_putc(seq, '\n'); 1198 1199 return 0; 1200 } 1201 1202 static const struct seq_operations input_handlers_seq_ops = { 1203 .start = input_handlers_seq_start, 1204 .next = input_handlers_seq_next, 1205 .stop = input_seq_stop, 1206 .show = input_handlers_seq_show, 1207 }; 1208 1209 static int input_proc_handlers_open(struct inode *inode, struct file *file) 1210 { 1211 return seq_open(file, &input_handlers_seq_ops); 1212 } 1213 1214 static const struct file_operations input_handlers_fileops = { 1215 .owner = THIS_MODULE, 1216 .open = input_proc_handlers_open, 1217 .read = seq_read, 1218 .llseek = seq_lseek, 1219 .release = seq_release, 1220 }; 1221 1222 static int __init input_proc_init(void) 1223 { 1224 struct proc_dir_entry *entry; 1225 1226 proc_bus_input_dir = proc_mkdir("bus/input", NULL); 1227 if (!proc_bus_input_dir) 1228 return -ENOMEM; 1229 1230 entry = proc_create("devices", 0, proc_bus_input_dir, 1231 &input_devices_fileops); 1232 if (!entry) 1233 goto fail1; 1234 1235 entry = proc_create("handlers", 0, proc_bus_input_dir, 1236 &input_handlers_fileops); 1237 if (!entry) 1238 goto fail2; 1239 1240 return 0; 1241 1242 fail2: remove_proc_entry("devices", proc_bus_input_dir); 1243 fail1: remove_proc_entry("bus/input", NULL); 1244 return -ENOMEM; 1245 } 1246 1247 static void input_proc_exit(void) 1248 { 1249 remove_proc_entry("devices", proc_bus_input_dir); 1250 remove_proc_entry("handlers", proc_bus_input_dir); 1251 remove_proc_entry("bus/input", NULL); 1252 } 1253 1254 #else /* !CONFIG_PROC_FS */ 1255 static inline void input_wakeup_procfs_readers(void) { } 1256 static inline int input_proc_init(void) { return 0; } 1257 static inline void input_proc_exit(void) { } 1258 #endif 1259 1260 #define INPUT_DEV_STRING_ATTR_SHOW(name) \ 1261 static ssize_t input_dev_show_##name(struct device *dev, \ 1262 struct device_attribute *attr, \ 1263 char *buf) \ 1264 { \ 1265 struct input_dev *input_dev = to_input_dev(dev); \ 1266 \ 1267 return scnprintf(buf, PAGE_SIZE, "%s\n", \ 1268 input_dev->name ? input_dev->name : ""); \ 1269 } \ 1270 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) 1271 1272 INPUT_DEV_STRING_ATTR_SHOW(name); 1273 INPUT_DEV_STRING_ATTR_SHOW(phys); 1274 INPUT_DEV_STRING_ATTR_SHOW(uniq); 1275 1276 static int input_print_modalias_bits(char *buf, int size, 1277 char name, unsigned long *bm, 1278 unsigned int min_bit, unsigned int max_bit) 1279 { 1280 int len = 0, i; 1281 1282 len += snprintf(buf, max(size, 0), "%c", name); 1283 for (i = min_bit; i < max_bit; i++) 1284 if (bm[BIT_WORD(i)] & BIT_MASK(i)) 1285 len += snprintf(buf + len, max(size - len, 0), "%X,", i); 1286 return len; 1287 } 1288 1289 static int input_print_modalias(char *buf, int size, struct input_dev *id, 1290 int add_cr) 1291 { 1292 int len; 1293 1294 len = snprintf(buf, max(size, 0), 1295 "input:b%04Xv%04Xp%04Xe%04X-", 1296 id->id.bustype, id->id.vendor, 1297 id->id.product, id->id.version); 1298 1299 len += input_print_modalias_bits(buf + len, size - len, 1300 'e', id->evbit, 0, EV_MAX); 1301 len += input_print_modalias_bits(buf + len, size - len, 1302 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); 1303 len += input_print_modalias_bits(buf + len, size - len, 1304 'r', id->relbit, 0, REL_MAX); 1305 len += input_print_modalias_bits(buf + len, size - len, 1306 'a', id->absbit, 0, ABS_MAX); 1307 len += input_print_modalias_bits(buf + len, size - len, 1308 'm', id->mscbit, 0, MSC_MAX); 1309 len += input_print_modalias_bits(buf + len, size - len, 1310 'l', id->ledbit, 0, LED_MAX); 1311 len += input_print_modalias_bits(buf + len, size - len, 1312 's', id->sndbit, 0, SND_MAX); 1313 len += input_print_modalias_bits(buf + len, size - len, 1314 'f', id->ffbit, 0, FF_MAX); 1315 len += input_print_modalias_bits(buf + len, size - len, 1316 'w', id->swbit, 0, SW_MAX); 1317 1318 if (add_cr) 1319 len += snprintf(buf + len, max(size - len, 0), "\n"); 1320 1321 return len; 1322 } 1323 1324 static ssize_t input_dev_show_modalias(struct device *dev, 1325 struct device_attribute *attr, 1326 char *buf) 1327 { 1328 struct input_dev *id = to_input_dev(dev); 1329 ssize_t len; 1330 1331 len = input_print_modalias(buf, PAGE_SIZE, id, 1); 1332 1333 return min_t(int, len, PAGE_SIZE); 1334 } 1335 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); 1336 1337 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, 1338 int max, int add_cr); 1339 1340 static ssize_t input_dev_show_properties(struct device *dev, 1341 struct device_attribute *attr, 1342 char *buf) 1343 { 1344 struct input_dev *input_dev = to_input_dev(dev); 1345 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit, 1346 INPUT_PROP_MAX, true); 1347 return min_t(int, len, PAGE_SIZE); 1348 } 1349 static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); 1350 1351 static struct attribute *input_dev_attrs[] = { 1352 &dev_attr_name.attr, 1353 &dev_attr_phys.attr, 1354 &dev_attr_uniq.attr, 1355 &dev_attr_modalias.attr, 1356 &dev_attr_properties.attr, 1357 NULL 1358 }; 1359 1360 static struct attribute_group input_dev_attr_group = { 1361 .attrs = input_dev_attrs, 1362 }; 1363 1364 #define INPUT_DEV_ID_ATTR(name) \ 1365 static ssize_t input_dev_show_id_##name(struct device *dev, \ 1366 struct device_attribute *attr, \ 1367 char *buf) \ 1368 { \ 1369 struct input_dev *input_dev = to_input_dev(dev); \ 1370 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ 1371 } \ 1372 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) 1373 1374 INPUT_DEV_ID_ATTR(bustype); 1375 INPUT_DEV_ID_ATTR(vendor); 1376 INPUT_DEV_ID_ATTR(product); 1377 INPUT_DEV_ID_ATTR(version); 1378 1379 static struct attribute *input_dev_id_attrs[] = { 1380 &dev_attr_bustype.attr, 1381 &dev_attr_vendor.attr, 1382 &dev_attr_product.attr, 1383 &dev_attr_version.attr, 1384 NULL 1385 }; 1386 1387 static struct attribute_group input_dev_id_attr_group = { 1388 .name = "id", 1389 .attrs = input_dev_id_attrs, 1390 }; 1391 1392 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, 1393 int max, int add_cr) 1394 { 1395 int i; 1396 int len = 0; 1397 bool skip_empty = true; 1398 1399 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { 1400 len += input_bits_to_string(buf + len, max(buf_size - len, 0), 1401 bitmap[i], skip_empty); 1402 if (len) { 1403 skip_empty = false; 1404 if (i > 0) 1405 len += snprintf(buf + len, max(buf_size - len, 0), " "); 1406 } 1407 } 1408 1409 /* 1410 * If no output was produced print a single 0. 1411 */ 1412 if (len == 0) 1413 len = snprintf(buf, buf_size, "%d", 0); 1414 1415 if (add_cr) 1416 len += snprintf(buf + len, max(buf_size - len, 0), "\n"); 1417 1418 return len; 1419 } 1420 1421 #define INPUT_DEV_CAP_ATTR(ev, bm) \ 1422 static ssize_t input_dev_show_cap_##bm(struct device *dev, \ 1423 struct device_attribute *attr, \ 1424 char *buf) \ 1425 { \ 1426 struct input_dev *input_dev = to_input_dev(dev); \ 1427 int len = input_print_bitmap(buf, PAGE_SIZE, \ 1428 input_dev->bm##bit, ev##_MAX, \ 1429 true); \ 1430 return min_t(int, len, PAGE_SIZE); \ 1431 } \ 1432 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) 1433 1434 INPUT_DEV_CAP_ATTR(EV, ev); 1435 INPUT_DEV_CAP_ATTR(KEY, key); 1436 INPUT_DEV_CAP_ATTR(REL, rel); 1437 INPUT_DEV_CAP_ATTR(ABS, abs); 1438 INPUT_DEV_CAP_ATTR(MSC, msc); 1439 INPUT_DEV_CAP_ATTR(LED, led); 1440 INPUT_DEV_CAP_ATTR(SND, snd); 1441 INPUT_DEV_CAP_ATTR(FF, ff); 1442 INPUT_DEV_CAP_ATTR(SW, sw); 1443 1444 static struct attribute *input_dev_caps_attrs[] = { 1445 &dev_attr_ev.attr, 1446 &dev_attr_key.attr, 1447 &dev_attr_rel.attr, 1448 &dev_attr_abs.attr, 1449 &dev_attr_msc.attr, 1450 &dev_attr_led.attr, 1451 &dev_attr_snd.attr, 1452 &dev_attr_ff.attr, 1453 &dev_attr_sw.attr, 1454 NULL 1455 }; 1456 1457 static struct attribute_group input_dev_caps_attr_group = { 1458 .name = "capabilities", 1459 .attrs = input_dev_caps_attrs, 1460 }; 1461 1462 static const struct attribute_group *input_dev_attr_groups[] = { 1463 &input_dev_attr_group, 1464 &input_dev_id_attr_group, 1465 &input_dev_caps_attr_group, 1466 NULL 1467 }; 1468 1469 static void input_dev_release(struct device *device) 1470 { 1471 struct input_dev *dev = to_input_dev(device); 1472 1473 input_ff_destroy(dev); 1474 input_mt_destroy_slots(dev); 1475 kfree(dev->absinfo); 1476 kfree(dev); 1477 1478 module_put(THIS_MODULE); 1479 } 1480 1481 /* 1482 * Input uevent interface - loading event handlers based on 1483 * device bitfields. 1484 */ 1485 static int input_add_uevent_bm_var(struct kobj_uevent_env *env, 1486 const char *name, unsigned long *bitmap, int max) 1487 { 1488 int len; 1489 1490 if (add_uevent_var(env, "%s", name)) 1491 return -ENOMEM; 1492 1493 len = input_print_bitmap(&env->buf[env->buflen - 1], 1494 sizeof(env->buf) - env->buflen, 1495 bitmap, max, false); 1496 if (len >= (sizeof(env->buf) - env->buflen)) 1497 return -ENOMEM; 1498 1499 env->buflen += len; 1500 return 0; 1501 } 1502 1503 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, 1504 struct input_dev *dev) 1505 { 1506 int len; 1507 1508 if (add_uevent_var(env, "MODALIAS=")) 1509 return -ENOMEM; 1510 1511 len = input_print_modalias(&env->buf[env->buflen - 1], 1512 sizeof(env->buf) - env->buflen, 1513 dev, 0); 1514 if (len >= (sizeof(env->buf) - env->buflen)) 1515 return -ENOMEM; 1516 1517 env->buflen += len; 1518 return 0; 1519 } 1520 1521 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ 1522 do { \ 1523 int err = add_uevent_var(env, fmt, val); \ 1524 if (err) \ 1525 return err; \ 1526 } while (0) 1527 1528 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ 1529 do { \ 1530 int err = input_add_uevent_bm_var(env, name, bm, max); \ 1531 if (err) \ 1532 return err; \ 1533 } while (0) 1534 1535 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ 1536 do { \ 1537 int err = input_add_uevent_modalias_var(env, dev); \ 1538 if (err) \ 1539 return err; \ 1540 } while (0) 1541 1542 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) 1543 { 1544 struct input_dev *dev = to_input_dev(device); 1545 1546 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", 1547 dev->id.bustype, dev->id.vendor, 1548 dev->id.product, dev->id.version); 1549 if (dev->name) 1550 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); 1551 if (dev->phys) 1552 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); 1553 if (dev->uniq) 1554 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); 1555 1556 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); 1557 1558 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); 1559 if (test_bit(EV_KEY, dev->evbit)) 1560 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); 1561 if (test_bit(EV_REL, dev->evbit)) 1562 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); 1563 if (test_bit(EV_ABS, dev->evbit)) 1564 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); 1565 if (test_bit(EV_MSC, dev->evbit)) 1566 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); 1567 if (test_bit(EV_LED, dev->evbit)) 1568 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); 1569 if (test_bit(EV_SND, dev->evbit)) 1570 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); 1571 if (test_bit(EV_FF, dev->evbit)) 1572 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); 1573 if (test_bit(EV_SW, dev->evbit)) 1574 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); 1575 1576 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); 1577 1578 return 0; 1579 } 1580 1581 #define INPUT_DO_TOGGLE(dev, type, bits, on) \ 1582 do { \ 1583 int i; \ 1584 bool active; \ 1585 \ 1586 if (!test_bit(EV_##type, dev->evbit)) \ 1587 break; \ 1588 \ 1589 for (i = 0; i < type##_MAX; i++) { \ 1590 if (!test_bit(i, dev->bits##bit)) \ 1591 continue; \ 1592 \ 1593 active = test_bit(i, dev->bits); \ 1594 if (!active && !on) \ 1595 continue; \ 1596 \ 1597 dev->event(dev, EV_##type, i, on ? active : 0); \ 1598 } \ 1599 } while (0) 1600 1601 static void input_dev_toggle(struct input_dev *dev, bool activate) 1602 { 1603 if (!dev->event) 1604 return; 1605 1606 INPUT_DO_TOGGLE(dev, LED, led, activate); 1607 INPUT_DO_TOGGLE(dev, SND, snd, activate); 1608 1609 if (activate && test_bit(EV_REP, dev->evbit)) { 1610 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); 1611 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); 1612 } 1613 } 1614 1615 /** 1616 * input_reset_device() - reset/restore the state of input device 1617 * @dev: input device whose state needs to be reset 1618 * 1619 * This function tries to reset the state of an opened input device and 1620 * bring internal state and state if the hardware in sync with each other. 1621 * We mark all keys as released, restore LED state, repeat rate, etc. 1622 */ 1623 void input_reset_device(struct input_dev *dev) 1624 { 1625 mutex_lock(&dev->mutex); 1626 1627 if (dev->users) { 1628 input_dev_toggle(dev, true); 1629 1630 /* 1631 * Keys that have been pressed at suspend time are unlikely 1632 * to be still pressed when we resume. 1633 */ 1634 spin_lock_irq(&dev->event_lock); 1635 input_dev_release_keys(dev); 1636 spin_unlock_irq(&dev->event_lock); 1637 } 1638 1639 mutex_unlock(&dev->mutex); 1640 } 1641 EXPORT_SYMBOL(input_reset_device); 1642 1643 #ifdef CONFIG_PM 1644 static int input_dev_suspend(struct device *dev) 1645 { 1646 struct input_dev *input_dev = to_input_dev(dev); 1647 1648 mutex_lock(&input_dev->mutex); 1649 1650 if (input_dev->users) 1651 input_dev_toggle(input_dev, false); 1652 1653 mutex_unlock(&input_dev->mutex); 1654 1655 return 0; 1656 } 1657 1658 static int input_dev_resume(struct device *dev) 1659 { 1660 struct input_dev *input_dev = to_input_dev(dev); 1661 1662 input_reset_device(input_dev); 1663 1664 return 0; 1665 } 1666 1667 static const struct dev_pm_ops input_dev_pm_ops = { 1668 .suspend = input_dev_suspend, 1669 .resume = input_dev_resume, 1670 .poweroff = input_dev_suspend, 1671 .restore = input_dev_resume, 1672 }; 1673 #endif /* CONFIG_PM */ 1674 1675 static struct device_type input_dev_type = { 1676 .groups = input_dev_attr_groups, 1677 .release = input_dev_release, 1678 .uevent = input_dev_uevent, 1679 #ifdef CONFIG_PM 1680 .pm = &input_dev_pm_ops, 1681 #endif 1682 }; 1683 1684 static char *input_devnode(struct device *dev, mode_t *mode) 1685 { 1686 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); 1687 } 1688 1689 struct class input_class = { 1690 .name = "input", 1691 .devnode = input_devnode, 1692 }; 1693 EXPORT_SYMBOL_GPL(input_class); 1694 1695 /** 1696 * input_allocate_device - allocate memory for new input device 1697 * 1698 * Returns prepared struct input_dev or NULL. 1699 * 1700 * NOTE: Use input_free_device() to free devices that have not been 1701 * registered; input_unregister_device() should be used for already 1702 * registered devices. 1703 */ 1704 struct input_dev *input_allocate_device(void) 1705 { 1706 struct input_dev *dev; 1707 1708 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); 1709 if (dev) { 1710 dev->dev.type = &input_dev_type; 1711 dev->dev.class = &input_class; 1712 device_initialize(&dev->dev); 1713 mutex_init(&dev->mutex); 1714 spin_lock_init(&dev->event_lock); 1715 INIT_LIST_HEAD(&dev->h_list); 1716 INIT_LIST_HEAD(&dev->node); 1717 1718 __module_get(THIS_MODULE); 1719 } 1720 1721 return dev; 1722 } 1723 EXPORT_SYMBOL(input_allocate_device); 1724 1725 /** 1726 * input_free_device - free memory occupied by input_dev structure 1727 * @dev: input device to free 1728 * 1729 * This function should only be used if input_register_device() 1730 * was not called yet or if it failed. Once device was registered 1731 * use input_unregister_device() and memory will be freed once last 1732 * reference to the device is dropped. 1733 * 1734 * Device should be allocated by input_allocate_device(). 1735 * 1736 * NOTE: If there are references to the input device then memory 1737 * will not be freed until last reference is dropped. 1738 */ 1739 void input_free_device(struct input_dev *dev) 1740 { 1741 if (dev) 1742 input_put_device(dev); 1743 } 1744 EXPORT_SYMBOL(input_free_device); 1745 1746 /** 1747 * input_set_capability - mark device as capable of a certain event 1748 * @dev: device that is capable of emitting or accepting event 1749 * @type: type of the event (EV_KEY, EV_REL, etc...) 1750 * @code: event code 1751 * 1752 * In addition to setting up corresponding bit in appropriate capability 1753 * bitmap the function also adjusts dev->evbit. 1754 */ 1755 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) 1756 { 1757 switch (type) { 1758 case EV_KEY: 1759 __set_bit(code, dev->keybit); 1760 break; 1761 1762 case EV_REL: 1763 __set_bit(code, dev->relbit); 1764 break; 1765 1766 case EV_ABS: 1767 __set_bit(code, dev->absbit); 1768 break; 1769 1770 case EV_MSC: 1771 __set_bit(code, dev->mscbit); 1772 break; 1773 1774 case EV_SW: 1775 __set_bit(code, dev->swbit); 1776 break; 1777 1778 case EV_LED: 1779 __set_bit(code, dev->ledbit); 1780 break; 1781 1782 case EV_SND: 1783 __set_bit(code, dev->sndbit); 1784 break; 1785 1786 case EV_FF: 1787 __set_bit(code, dev->ffbit); 1788 break; 1789 1790 case EV_PWR: 1791 /* do nothing */ 1792 break; 1793 1794 default: 1795 pr_err("input_set_capability: unknown type %u (code %u)\n", 1796 type, code); 1797 dump_stack(); 1798 return; 1799 } 1800 1801 __set_bit(type, dev->evbit); 1802 } 1803 EXPORT_SYMBOL(input_set_capability); 1804 1805 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ 1806 do { \ 1807 if (!test_bit(EV_##type, dev->evbit)) \ 1808 memset(dev->bits##bit, 0, \ 1809 sizeof(dev->bits##bit)); \ 1810 } while (0) 1811 1812 static void input_cleanse_bitmasks(struct input_dev *dev) 1813 { 1814 INPUT_CLEANSE_BITMASK(dev, KEY, key); 1815 INPUT_CLEANSE_BITMASK(dev, REL, rel); 1816 INPUT_CLEANSE_BITMASK(dev, ABS, abs); 1817 INPUT_CLEANSE_BITMASK(dev, MSC, msc); 1818 INPUT_CLEANSE_BITMASK(dev, LED, led); 1819 INPUT_CLEANSE_BITMASK(dev, SND, snd); 1820 INPUT_CLEANSE_BITMASK(dev, FF, ff); 1821 INPUT_CLEANSE_BITMASK(dev, SW, sw); 1822 } 1823 1824 /** 1825 * input_register_device - register device with input core 1826 * @dev: device to be registered 1827 * 1828 * This function registers device with input core. The device must be 1829 * allocated with input_allocate_device() and all it's capabilities 1830 * set up before registering. 1831 * If function fails the device must be freed with input_free_device(). 1832 * Once device has been successfully registered it can be unregistered 1833 * with input_unregister_device(); input_free_device() should not be 1834 * called in this case. 1835 */ 1836 int input_register_device(struct input_dev *dev) 1837 { 1838 static atomic_t input_no = ATOMIC_INIT(0); 1839 struct input_handler *handler; 1840 const char *path; 1841 int error; 1842 1843 /* Every input device generates EV_SYN/SYN_REPORT events. */ 1844 __set_bit(EV_SYN, dev->evbit); 1845 1846 /* KEY_RESERVED is not supposed to be transmitted to userspace. */ 1847 __clear_bit(KEY_RESERVED, dev->keybit); 1848 1849 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ 1850 input_cleanse_bitmasks(dev); 1851 1852 /* 1853 * If delay and period are pre-set by the driver, then autorepeating 1854 * is handled by the driver itself and we don't do it in input.c. 1855 */ 1856 init_timer(&dev->timer); 1857 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { 1858 dev->timer.data = (long) dev; 1859 dev->timer.function = input_repeat_key; 1860 dev->rep[REP_DELAY] = 250; 1861 dev->rep[REP_PERIOD] = 33; 1862 } 1863 1864 if (!dev->getkeycode && !dev->getkeycode_new) 1865 dev->getkeycode_new = input_default_getkeycode; 1866 1867 if (!dev->setkeycode && !dev->setkeycode_new) 1868 dev->setkeycode_new = input_default_setkeycode; 1869 1870 dev_set_name(&dev->dev, "input%ld", 1871 (unsigned long) atomic_inc_return(&input_no) - 1); 1872 1873 error = device_add(&dev->dev); 1874 if (error) 1875 return error; 1876 1877 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); 1878 pr_info("%s as %s\n", 1879 dev->name ? dev->name : "Unspecified device", 1880 path ? path : "N/A"); 1881 kfree(path); 1882 1883 error = mutex_lock_interruptible(&input_mutex); 1884 if (error) { 1885 device_del(&dev->dev); 1886 return error; 1887 } 1888 1889 list_add_tail(&dev->node, &input_dev_list); 1890 1891 list_for_each_entry(handler, &input_handler_list, node) 1892 input_attach_handler(dev, handler); 1893 1894 input_wakeup_procfs_readers(); 1895 1896 mutex_unlock(&input_mutex); 1897 1898 return 0; 1899 } 1900 EXPORT_SYMBOL(input_register_device); 1901 1902 /** 1903 * input_unregister_device - unregister previously registered device 1904 * @dev: device to be unregistered 1905 * 1906 * This function unregisters an input device. Once device is unregistered 1907 * the caller should not try to access it as it may get freed at any moment. 1908 */ 1909 void input_unregister_device(struct input_dev *dev) 1910 { 1911 struct input_handle *handle, *next; 1912 1913 input_disconnect_device(dev); 1914 1915 mutex_lock(&input_mutex); 1916 1917 list_for_each_entry_safe(handle, next, &dev->h_list, d_node) 1918 handle->handler->disconnect(handle); 1919 WARN_ON(!list_empty(&dev->h_list)); 1920 1921 del_timer_sync(&dev->timer); 1922 list_del_init(&dev->node); 1923 1924 input_wakeup_procfs_readers(); 1925 1926 mutex_unlock(&input_mutex); 1927 1928 device_unregister(&dev->dev); 1929 } 1930 EXPORT_SYMBOL(input_unregister_device); 1931 1932 /** 1933 * input_register_handler - register a new input handler 1934 * @handler: handler to be registered 1935 * 1936 * This function registers a new input handler (interface) for input 1937 * devices in the system and attaches it to all input devices that 1938 * are compatible with the handler. 1939 */ 1940 int input_register_handler(struct input_handler *handler) 1941 { 1942 struct input_dev *dev; 1943 int retval; 1944 1945 retval = mutex_lock_interruptible(&input_mutex); 1946 if (retval) 1947 return retval; 1948 1949 INIT_LIST_HEAD(&handler->h_list); 1950 1951 if (handler->fops != NULL) { 1952 if (input_table[handler->minor >> 5]) { 1953 retval = -EBUSY; 1954 goto out; 1955 } 1956 input_table[handler->minor >> 5] = handler; 1957 } 1958 1959 list_add_tail(&handler->node, &input_handler_list); 1960 1961 list_for_each_entry(dev, &input_dev_list, node) 1962 input_attach_handler(dev, handler); 1963 1964 input_wakeup_procfs_readers(); 1965 1966 out: 1967 mutex_unlock(&input_mutex); 1968 return retval; 1969 } 1970 EXPORT_SYMBOL(input_register_handler); 1971 1972 /** 1973 * input_unregister_handler - unregisters an input handler 1974 * @handler: handler to be unregistered 1975 * 1976 * This function disconnects a handler from its input devices and 1977 * removes it from lists of known handlers. 1978 */ 1979 void input_unregister_handler(struct input_handler *handler) 1980 { 1981 struct input_handle *handle, *next; 1982 1983 mutex_lock(&input_mutex); 1984 1985 list_for_each_entry_safe(handle, next, &handler->h_list, h_node) 1986 handler->disconnect(handle); 1987 WARN_ON(!list_empty(&handler->h_list)); 1988 1989 list_del_init(&handler->node); 1990 1991 if (handler->fops != NULL) 1992 input_table[handler->minor >> 5] = NULL; 1993 1994 input_wakeup_procfs_readers(); 1995 1996 mutex_unlock(&input_mutex); 1997 } 1998 EXPORT_SYMBOL(input_unregister_handler); 1999 2000 /** 2001 * input_handler_for_each_handle - handle iterator 2002 * @handler: input handler to iterate 2003 * @data: data for the callback 2004 * @fn: function to be called for each handle 2005 * 2006 * Iterate over @bus's list of devices, and call @fn for each, passing 2007 * it @data and stop when @fn returns a non-zero value. The function is 2008 * using RCU to traverse the list and therefore may be usind in atonic 2009 * contexts. The @fn callback is invoked from RCU critical section and 2010 * thus must not sleep. 2011 */ 2012 int input_handler_for_each_handle(struct input_handler *handler, void *data, 2013 int (*fn)(struct input_handle *, void *)) 2014 { 2015 struct input_handle *handle; 2016 int retval = 0; 2017 2018 rcu_read_lock(); 2019 2020 list_for_each_entry_rcu(handle, &handler->h_list, h_node) { 2021 retval = fn(handle, data); 2022 if (retval) 2023 break; 2024 } 2025 2026 rcu_read_unlock(); 2027 2028 return retval; 2029 } 2030 EXPORT_SYMBOL(input_handler_for_each_handle); 2031 2032 /** 2033 * input_register_handle - register a new input handle 2034 * @handle: handle to register 2035 * 2036 * This function puts a new input handle onto device's 2037 * and handler's lists so that events can flow through 2038 * it once it is opened using input_open_device(). 2039 * 2040 * This function is supposed to be called from handler's 2041 * connect() method. 2042 */ 2043 int input_register_handle(struct input_handle *handle) 2044 { 2045 struct input_handler *handler = handle->handler; 2046 struct input_dev *dev = handle->dev; 2047 int error; 2048 2049 /* 2050 * We take dev->mutex here to prevent race with 2051 * input_release_device(). 2052 */ 2053 error = mutex_lock_interruptible(&dev->mutex); 2054 if (error) 2055 return error; 2056 2057 /* 2058 * Filters go to the head of the list, normal handlers 2059 * to the tail. 2060 */ 2061 if (handler->filter) 2062 list_add_rcu(&handle->d_node, &dev->h_list); 2063 else 2064 list_add_tail_rcu(&handle->d_node, &dev->h_list); 2065 2066 mutex_unlock(&dev->mutex); 2067 2068 /* 2069 * Since we are supposed to be called from ->connect() 2070 * which is mutually exclusive with ->disconnect() 2071 * we can't be racing with input_unregister_handle() 2072 * and so separate lock is not needed here. 2073 */ 2074 list_add_tail_rcu(&handle->h_node, &handler->h_list); 2075 2076 if (handler->start) 2077 handler->start(handle); 2078 2079 return 0; 2080 } 2081 EXPORT_SYMBOL(input_register_handle); 2082 2083 /** 2084 * input_unregister_handle - unregister an input handle 2085 * @handle: handle to unregister 2086 * 2087 * This function removes input handle from device's 2088 * and handler's lists. 2089 * 2090 * This function is supposed to be called from handler's 2091 * disconnect() method. 2092 */ 2093 void input_unregister_handle(struct input_handle *handle) 2094 { 2095 struct input_dev *dev = handle->dev; 2096 2097 list_del_rcu(&handle->h_node); 2098 2099 /* 2100 * Take dev->mutex to prevent race with input_release_device(). 2101 */ 2102 mutex_lock(&dev->mutex); 2103 list_del_rcu(&handle->d_node); 2104 mutex_unlock(&dev->mutex); 2105 2106 synchronize_rcu(); 2107 } 2108 EXPORT_SYMBOL(input_unregister_handle); 2109 2110 static int input_open_file(struct inode *inode, struct file *file) 2111 { 2112 struct input_handler *handler; 2113 const struct file_operations *old_fops, *new_fops = NULL; 2114 int err; 2115 2116 err = mutex_lock_interruptible(&input_mutex); 2117 if (err) 2118 return err; 2119 2120 /* No load-on-demand here? */ 2121 handler = input_table[iminor(inode) >> 5]; 2122 if (handler) 2123 new_fops = fops_get(handler->fops); 2124 2125 mutex_unlock(&input_mutex); 2126 2127 /* 2128 * That's _really_ odd. Usually NULL ->open means "nothing special", 2129 * not "no device". Oh, well... 2130 */ 2131 if (!new_fops || !new_fops->open) { 2132 fops_put(new_fops); 2133 err = -ENODEV; 2134 goto out; 2135 } 2136 2137 old_fops = file->f_op; 2138 file->f_op = new_fops; 2139 2140 err = new_fops->open(inode, file); 2141 if (err) { 2142 fops_put(file->f_op); 2143 file->f_op = fops_get(old_fops); 2144 } 2145 fops_put(old_fops); 2146 out: 2147 return err; 2148 } 2149 2150 static const struct file_operations input_fops = { 2151 .owner = THIS_MODULE, 2152 .open = input_open_file, 2153 .llseek = noop_llseek, 2154 }; 2155 2156 static int __init input_init(void) 2157 { 2158 int err; 2159 2160 err = class_register(&input_class); 2161 if (err) { 2162 pr_err("unable to register input_dev class\n"); 2163 return err; 2164 } 2165 2166 err = input_proc_init(); 2167 if (err) 2168 goto fail1; 2169 2170 err = register_chrdev(INPUT_MAJOR, "input", &input_fops); 2171 if (err) { 2172 pr_err("unable to register char major %d", INPUT_MAJOR); 2173 goto fail2; 2174 } 2175 2176 return 0; 2177 2178 fail2: input_proc_exit(); 2179 fail1: class_unregister(&input_class); 2180 return err; 2181 } 2182 2183 static void __exit input_exit(void) 2184 { 2185 input_proc_exit(); 2186 unregister_chrdev(INPUT_MAJOR, "input"); 2187 class_unregister(&input_class); 2188 } 2189 2190 subsys_initcall(input_init); 2191 module_exit(input_exit); 2192