Changeset cf2ccd4 in mainline for uspace/drv/usbhid
- Timestamp:
- 2011-04-22T09:26:50Z (15 years ago)
- Branches:
- lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
- Children:
- 7304663
- Parents:
- 1553cbf (diff), 1775ebc (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the(diff)links above to see all the changes relative to each parent. - Location:
- uspace/drv/usbhid
- Files:
-
- 9 edited
-
kbd/conv.c (modified) (1 diff)
-
kbd/kbddev.c (modified) (14 diffs)
-
kbd/kbddev.h (modified) (1 diff)
-
lgtch-ultrax/lgtch-ultrax.c (modified) (2 diffs)
-
mouse/mousedev.c (modified) (1 diff)
-
subdrivers.c (modified) (2 diffs)
-
subdrivers.h (modified) (1 diff)
-
usbhid.c (modified) (7 diffs)
-
usbhid.h (modified) (1 diff)
Legend:
- Unmodified
- Added
- Removed
-
uspace/drv/usbhid/kbd/conv.c
r1553cbf rcf2ccd4 99 99 [0x30] = KC_RBRACKET, 100 100 [0x31] = KC_BACKSLASH, 101 //[0x32] = KC_, // TODO: HASH??? maybe some as 0x31 - backslash 101 //[0x32] = KC_, // TODO: HASH??? maybe same as 0x31 - backslash 102 [0x32] = KC_BACKSLASH, 102 103 [0x33] = KC_SEMICOLON, 103 104 [0x34] = KC_QUOTE, // same as APOSTROPHE? (') -
uspace/drv/usbhid/kbd/kbddev.c
r1553cbf rcf2ccd4 177 177 /*----------------------------------------------------------------------------*/ 178 178 179 static void usb_kbd_process_keycodes(const uint8_t *key_codes, size_t count,180 uint8_t report_id, void *arg);181 182 static const usb_hid_report_in_callbacks_t usb_kbd_parser_callbacks = {183 .keyboard = usb_kbd_process_keycodes184 };179 //static void usb_kbd_process_keycodes(const uint8_t *key_codes, size_t count, 180 // uint8_t report_id, void *arg); 181 182 //static const usb_hid_report_in_callbacks_t usb_kbd_parser_callbacks = { 183 // .keyboard = usb_kbd_process_keycodes 184 //}; 185 185 186 186 /*----------------------------------------------------------------------------*/ … … 304 304 usb_log_debug("Creating output report:\n"); 305 305 306 usb_hid_report_field_t *field = usb_hid_report_get_sibling (hid_dev->parser, NULL, 307 kbd_dev->led_path, 308 USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY | USB_HID_PATH_COMPARE_END, 309 USB_HID_REPORT_TYPE_OUTPUT); 310 while(field != NULL) { 311 312 if((field->usage == USB_HID_LED_NUM_LOCK) && (kbd_dev->mods & KM_NUM_LOCK)){ 306 usb_hid_report_field_t *field = usb_hid_report_get_sibling( 307 hid_dev->report, NULL, kbd_dev->led_path, 308 USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY | USB_HID_PATH_COMPARE_END, 309 USB_HID_REPORT_TYPE_OUTPUT); 310 311 while (field != NULL) { 312 313 if ((field->usage == USB_HID_LED_NUM_LOCK) 314 && (kbd_dev->mods & KM_NUM_LOCK)){ 313 315 field->value = 1; 314 316 } 315 317 316 if((field->usage == USB_HID_LED_CAPS_LOCK) && (kbd_dev->mods & KM_CAPS_LOCK)){ 318 if ((field->usage == USB_HID_LED_CAPS_LOCK) 319 && (kbd_dev->mods & KM_CAPS_LOCK)){ 317 320 field->value = 1; 318 321 } 319 322 320 if((field->usage == USB_HID_LED_SCROLL_LOCK) && (kbd_dev->mods & KM_SCROLL_LOCK)){ 323 if ((field->usage == USB_HID_LED_SCROLL_LOCK) 324 && (kbd_dev->mods & KM_SCROLL_LOCK)){ 321 325 field->value = 1; 322 326 } 323 327 324 field = usb_hid_report_get_sibling (hid_dev->parser, field,325 kbd_dev->led_path,326 USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY | USB_HID_PATH_COMPARE_END,327 USB_HID_REPORT_TYPE_OUTPUT);328 }329 330 int rc = usb_hid_report_output_translate(hid_dev-> parser, 0,328 field = usb_hid_report_get_sibling(hid_dev->report, field, 329 kbd_dev->led_path, USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY 330 | USB_HID_PATH_COMPARE_END, USB_HID_REPORT_TYPE_OUTPUT); 331 } 332 333 // TODO: what about the Report ID? 334 int rc = usb_hid_report_output_translate(hid_dev->report, 0, 331 335 kbd_dev->output_buffer, kbd_dev->output_size); 332 336 … … 488 492 */ 489 493 static void usb_kbd_check_key_changes(usb_hid_dev_t *hid_dev, 490 usb_kbd_t *kbd_dev , const uint8_t *key_codes, size_t count)494 usb_kbd_t *kbd_dev/*, const uint8_t *key_codes, size_t count*/) 491 495 { 492 496 unsigned int key; … … 502 506 */ 503 507 i = 0; 504 while (i < count && key_codes[i] != ERROR_ROLLOVER) {508 while (i < kbd_dev->key_count && kbd_dev->keys[i] != ERROR_ROLLOVER) { 505 509 ++i; 506 510 } 507 if (i != count) {511 if (i != kbd_dev->key_count) { 508 512 usb_log_debug("Phantom state occured.\n"); 509 513 // phantom state, do nothing 510 514 return; 511 515 } 512 513 /* TODO: quite dummy right now, think of better implementation */514 assert(count == kbd_dev->key_count);515 516 516 517 /* 517 518 * 1) Key releases 518 519 */ 519 for (j = 0; j < count; ++j) {520 for (j = 0; j < kbd_dev->key_count; ++j) { 520 521 // try to find the old key in the new key list 521 522 i = 0; 522 523 while (i < kbd_dev->key_count 523 && k ey_codes[i] != kbd_dev->keys[j]) {524 && kbd_dev->keys[i] != kbd_dev->keys_old[j]) { 524 525 ++i; 525 526 } 526 527 527 if (i == count) {528 if (i == kbd_dev->key_count) { 528 529 // not found, i.e. the key was released 529 key = usbhid_parse_scancode(kbd_dev->keys [j]);530 key = usbhid_parse_scancode(kbd_dev->keys_old[j]); 530 531 if (!usb_kbd_is_lock(key)) { 531 532 usb_kbd_repeat_stop(kbd_dev, key); … … 544 545 // try to find the new key in the old key list 545 546 j = 0; 546 while (j < count && kbd_dev->keys[j] != key_codes[i]) { 547 while (j < kbd_dev->key_count 548 && kbd_dev->keys_old[j] != kbd_dev->keys[i]) { 547 549 ++j; 548 550 } 549 551 550 if (j == count) {552 if (j == kbd_dev->key_count) { 551 553 // not found, i.e. new key pressed 552 key = usbhid_parse_scancode(k ey_codes[i]);554 key = usbhid_parse_scancode(kbd_dev->keys[i]); 553 555 usb_log_debug2("Key pressed: %d (keycode: %d)\n", key, 554 key_codes[i]); 555 usb_kbd_push_ev(hid_dev, kbd_dev, KEY_PRESS, 556 key); 556 kbd_dev->keys[i]); 557 usb_kbd_push_ev(hid_dev, kbd_dev, KEY_PRESS, key); 557 558 if (!usb_kbd_is_lock(key)) { 558 559 usb_kbd_repeat_start(kbd_dev, key); … … 563 564 } 564 565 565 memcpy(kbd_dev->keys, key_codes, count); 566 567 usb_log_debug("New stored keycodes: %s\n", 568 usb_debug_str_buffer(kbd_dev->keys, kbd_dev->key_count, 0)); 566 // usb_log_debug("Old keys: "); 567 // for (i = 0; i < kbd_dev->key_count; ++i) { 568 // usb_log_debug("%d ", kbd_dev->keys_old[i]); 569 // } 570 // usb_log_debug("\n"); 571 572 573 // usb_log_debug("New keys: "); 574 // for (i = 0; i < kbd_dev->key_count; ++i) { 575 // usb_log_debug("%d ", kbd_dev->keys[i]); 576 // } 577 // usb_log_debug("\n"); 578 579 memcpy(kbd_dev->keys_old, kbd_dev->keys, kbd_dev->key_count * 4); 580 581 usb_log_debug2("New stored keys: "); 582 for (i = 0; i < kbd_dev->key_count; ++i) { 583 usb_log_debug2("%d ", kbd_dev->keys_old[i]); 584 } 585 usb_log_debug2("\n"); 569 586 } 570 587 … … 588 605 * @sa usb_kbd_check_key_changes(), usb_kbd_check_modifier_changes() 589 606 */ 590 static void usb_kbd_process_keycodes(const uint8_t *key_codes, size_t count,591 uint8_t report_id, void *arg)592 {593 if (arg == NULL) {594 usb_log_warning("Missing argument in callback "595 "usbhid_process_keycodes().\n");596 return;597 }598 599 usb_hid_dev_t *hid_dev = (usb_hid_dev_t *)arg;600 601 if (hid_dev->data == NULL) {602 usb_log_warning("Missing KBD device structure in callback.\n");603 return;604 }605 606 usb_kbd_t *kbd_dev = (usb_kbd_t *)hid_dev->data;607 608 usb_log_debug("Got keys from parser (report id: %u): %s\n",609 report_id, usb_debug_str_buffer(key_codes, count, 0));610 611 if (count != kbd_dev->key_count) {612 usb_log_warning("Number of received keycodes (%d) differs from"613 " expected number (%d).\n", count, kbd_dev->key_count);614 return;615 }616 617 ///usb_kbd_check_modifier_changes(kbd_dev, key_codes, count);618 usb_kbd_check_key_changes(hid_dev, kbd_dev, key_codes, count);619 }607 //static void usb_kbd_process_keycodes(const uint8_t *key_codes, size_t count, 608 // uint8_t report_id, void *arg) 609 //{ 610 // if (arg == NULL) { 611 // usb_log_warning("Missing argument in callback " 612 // "usbhid_process_keycodes().\n"); 613 // return; 614 // } 615 616 // usb_hid_dev_t *hid_dev = (usb_hid_dev_t *)arg; 617 618 // if (hid_dev->data == NULL) { 619 // usb_log_warning("Missing KBD device structure in callback.\n"); 620 // return; 621 // } 622 623 // usb_kbd_t *kbd_dev = (usb_kbd_t *)hid_dev->data; 624 625 // usb_log_debug("Got keys from parser (report id: %u): %s\n", 626 // report_id, usb_debug_str_buffer(key_codes, count, 0)); 627 628 // if (count != kbd_dev->key_count) { 629 // usb_log_warning("Number of received keycodes (%zu) differs from" 630 // " expected (%zu).\n", count, kbd_dev->key_count); 631 // return; 632 // } 633 634 // ///usb_kbd_check_modifier_changes(kbd_dev, key_codes, count); 635 // usb_kbd_check_key_changes(hid_dev, kbd_dev, key_codes, count); 636 //} 620 637 621 638 /*----------------------------------------------------------------------------*/ … … 641 658 uint8_t *buffer, size_t actual_size) 642 659 { 643 assert(hid_dev->parser != NULL); 660 assert(hid_dev->report != NULL); 661 assert(hid_dev != NULL); 662 assert(hid_dev->data != NULL); 663 664 usb_kbd_t *kbd_dev = (usb_kbd_t *)hid_dev->data; 644 665 645 666 usb_log_debug("Calling usb_hid_parse_report() with " … … 653 674 654 675 uint8_t report_id; 655 int rc = usb_hid_parse_report(hid_dev->parser, buffer, actual_size, &report_id); 676 int rc = usb_hid_parse_report(hid_dev->report, buffer, actual_size, 677 &report_id); 678 679 if (rc != EOK) { 680 usb_log_warning("Error in usb_hid_parse_report():" 681 "%s\n", str_error(rc)); 682 } 683 656 684 usb_hid_report_path_set_report_id (path, report_id); 657 usb_hid_report_field_t *field = usb_hid_report_get_sibling(hid_dev->parser, 658 NULL, path, USB_HID_PATH_COMPARE_END | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY, 659 USB_HID_REPORT_TYPE_INPUT); 660 661 unsigned i=0; 662 usb_kbd_t *kbd_dev = (usb_kbd_t *)hid_dev->data; 663 664 memset(kbd_dev->keys, 0, kbd_dev->key_count); 665 while(field != NULL) { 666 if((i < kbd_dev->key_count) && (field->value != 0)){ 667 kbd_dev->keys[i++] = (uint8_t)field->usage; 668 } 669 field = usb_hid_report_get_sibling(hid_dev->parser, field, path, 670 USB_HID_PATH_COMPARE_END | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY, 671 USB_HID_REPORT_TYPE_INPUT); 672 } 673 usb_kbd_process_keycodes(kbd_dev->keys, kbd_dev->key_count, report_id, hid_dev); 685 686 // fill in the currently pressed keys 687 688 usb_hid_report_field_t *field = usb_hid_report_get_sibling( 689 hid_dev->report, NULL, path, 690 USB_HID_PATH_COMPARE_END | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY, 691 USB_HID_REPORT_TYPE_INPUT); 692 unsigned i = 0; 693 694 while (field != NULL) { 695 usb_log_debug2("FIELD (%p) - VALUE(%d) USAGE(%u)\n", 696 field, field->value, field->value); 697 698 assert(i < kbd_dev->key_count); 699 // if (i == kbd_dev->key_count) { 700 // break; 701 // } 702 703 // save the key usage 704 /* TODO: maybe it's not good to save value, nor usage 705 * as the value may be e.g. 1 for LEDs and usage may be 706 * value of the LED. On the other hand, in case of normal 707 * keys, the usage is more important and we must check 708 * that. One possible solution: distinguish between those 709 * two parts of the Report somehow. 710 */ 711 kbd_dev->keys[i] = field->value; 712 usb_log_debug2("Saved %u. key usage %d\n", i, kbd_dev->keys[i]); 713 714 ++i; 715 field = usb_hid_report_get_sibling(hid_dev->report, field, path, 716 USB_HID_PATH_COMPARE_END 717 | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY, 718 USB_HID_REPORT_TYPE_INPUT); 719 } 674 720 675 721 usb_hid_report_path_free(path); 676 722 677 if (rc != EOK) { 678 usb_log_warning("Error in usb_hid_boot_keyboard_input_report():" 679 "%s\n", str_error(rc)); 680 } 723 usb_kbd_check_key_changes(hid_dev, kbd_dev); 681 724 } 682 725 … … 766 809 767 810 kbd_dev->key_count = usb_hid_report_input_length( 768 hid_dev-> parser, path,811 hid_dev->report, path, 769 812 USB_HID_PATH_COMPARE_END | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY); 770 813 usb_hid_report_path_free(path); … … 772 815 usb_log_debug("Size of the input report: %zu\n", kbd_dev->key_count); 773 816 774 kbd_dev->keys = ( uint8_t *)calloc(kbd_dev->key_count, sizeof(uint8_t));817 kbd_dev->keys = (int32_t *)calloc(kbd_dev->key_count, sizeof(int32_t)); 775 818 776 819 if (kbd_dev->keys == NULL) { … … 780 823 } 781 824 825 kbd_dev->keys_old = 826 (int32_t *)calloc(kbd_dev->key_count, sizeof(int32_t)); 827 828 if (kbd_dev->keys_old == NULL) { 829 usb_log_fatal("No memory!\n"); 830 free(kbd_dev->keys); 831 free(kbd_dev); 832 return ENOMEM; 833 } 834 782 835 /* 783 836 * Output report 784 837 */ 785 838 kbd_dev->output_size = 0; 786 kbd_dev->output_buffer = usb_hid_report_output(hid_dev-> parser,787 &kbd_dev->output_size, 0 x00);839 kbd_dev->output_buffer = usb_hid_report_output(hid_dev->report, 840 &kbd_dev->output_size, 0); 788 841 if (kbd_dev->output_buffer == NULL) { 789 842 usb_log_warning("Error creating output report buffer.\n"); … … 798 851 kbd_dev->led_path, USB_HIDUT_PAGE_LED, 0); 799 852 800 kbd_dev->led_output_size = usb_hid_report_output_size(hid_dev-> parser,853 kbd_dev->led_output_size = usb_hid_report_output_size(hid_dev->report, 801 854 kbd_dev->led_path, 802 855 USB_HID_PATH_COMPARE_END | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY); … … 955 1008 int usb_kbd_set_boot_protocol(usb_hid_dev_t *hid_dev) 956 1009 { 957 int rc = usb_hid_parse_report_descriptor(hid_dev-> parser,1010 int rc = usb_hid_parse_report_descriptor(hid_dev->report, 958 1011 USB_KBD_BOOT_REPORT_DESCRIPTOR, 959 1012 USB_KBD_BOOT_REPORT_DESCRIPTOR_SIZE); -
uspace/drv/usbhid/kbd/kbddev.h
r1553cbf rcf2ccd4 65 65 */ 66 66 typedef struct usb_kbd_t { 67 /** Previously pressed keys (not translated to key codes). */ 68 int32_t *keys_old; 67 69 /** Currently pressed keys (not translated to key codes). */ 68 uint8_t *keys;70 int32_t *keys; 69 71 /** Count of stored keys (i.e. number of keys in the report). */ 70 72 size_t key_count; -
uspace/drv/usbhid/lgtch-ultrax/lgtch-ultrax.c
r1553cbf rcf2ccd4 83 83 84 84 uint8_t report_id; 85 int rc = usb_hid_parse_report(hid_dev->parser, buffer, buffer_size, &report_id); 85 86 int rc = usb_hid_parse_report(hid_dev->report, buffer, buffer_size, 87 &report_id); 86 88 usb_hid_report_path_set_report_id(path, report_id); 87 89 88 usb_hid_report_field_t *field = usb_hid_report_get_sibling(hid_dev->parser, NULL, path, USB_HID_PATH_COMPARE_END , USB_HID_REPORT_TYPE_INPUT); 89 while(field != NULL) { 90 usb_log_debug("KEY VALUE(%X) USAGE(%X)\n", field->value, field->usage); 90 usb_hid_report_field_t *field = usb_hid_report_get_sibling( 91 hid_dev->report, NULL, path, USB_HID_PATH_COMPARE_END , 92 USB_HID_REPORT_TYPE_INPUT); 93 94 while (field != NULL) { 95 usb_log_debug(NAME " KEY VALUE(%X) USAGE(%X)\n", field->value, 96 field->usage); 91 97 } 92 98 … … 95 101 96 102 if (rc != EOK) { 97 usb_log_warning( "Error in usb_hid_boot_keyboard_input_report():"103 usb_log_warning(NAME "Error in usb_hid_boot_keyboard_input_report():" 98 104 "%s\n", str_error(rc)); 99 105 } -
uspace/drv/usbhid/mouse/mousedev.c
r1553cbf rcf2ccd4 296 296 int usb_mouse_set_boot_protocol(usb_hid_dev_t *hid_dev) 297 297 { 298 int rc = usb_hid_parse_report_descriptor(hid_dev-> parser,298 int rc = usb_hid_parse_report_descriptor(hid_dev->report, 299 299 USB_MOUSE_BOOT_REPORT_DESCRIPTOR, 300 300 USB_MOUSE_BOOT_REPORT_DESCRIPTOR_SIZE); -
uspace/drv/usbhid/subdrivers.c
r1553cbf rcf2ccd4 55 55 USB_HID_PATH_COMPARE_END 56 56 | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY, 57 0,58 0,57 -1, 58 -1, 59 59 { 60 60 .init = usb_kbd_init, … … 79 79 } 80 80 }, 81 {NULL, -1, 0, 0, 0, {NULL, NULL, NULL, NULL}}81 {NULL, -1, 0, -1, -1, {NULL, NULL, NULL, NULL}} 82 82 }; 83 83 -
uspace/drv/usbhid/subdrivers.h
r1553cbf rcf2ccd4 56 56 int report_id; 57 57 int compare; 58 uint16_t vendor_id;59 uint16_t product_id;58 int vendor_id; 59 int product_id; 60 60 usb_hid_subdriver_t subdriver; 61 61 } usb_hid_subdriver_mapping_t; -
uspace/drv/usbhid/usbhid.c
r1553cbf rcf2ccd4 158 158 const usb_hid_subdriver_mapping_t *mapping) 159 159 { 160 return false; 160 assert(hid_dev != NULL); 161 assert(hid_dev->usb_dev != NULL); 162 163 return (hid_dev->usb_dev->descriptors.device.vendor_id 164 == mapping->vendor_id 165 && hid_dev->usb_dev->descriptors.device.product_id 166 == mapping->product_id); 161 167 } 162 168 … … 192 198 } 193 199 194 assert(hid_dev-> parser!= NULL);200 assert(hid_dev->report != NULL); 195 201 196 202 usb_log_debug("Compare flags: %d\n", mapping->compare); 197 size_t size = usb_hid_report_input_length(hid_dev-> parser, usage_path,203 size_t size = usb_hid_report_input_length(hid_dev->report, usage_path, 198 204 mapping->compare); 199 usb_log_debug("Size of the input report: % d\n", size);205 usb_log_debug("Size of the input report: %zuB\n", size); 200 206 201 207 usb_hid_report_path_free(usage_path); … … 251 257 while (count < USB_HID_MAX_SUBDRIVERS && 252 258 (mapping->usage_path != NULL 253 || mapping->vendor_id != 0 || mapping->product_id != 0)) {259 || mapping->vendor_id >= 0 || mapping->product_id >= 0)) { 254 260 // check the vendor & product ID 255 if (mapping->vendor_id != 0 && mapping->product_id ==0) {256 usb_log_warning("Missing Product ID for Vendor ID % u\n",261 if (mapping->vendor_id >= 0 && mapping->product_id < 0) { 262 usb_log_warning("Missing Product ID for Vendor ID %d\n", 257 263 mapping->vendor_id); 258 264 return EINVAL; 259 265 } 260 if (mapping->product_id != 0 && mapping->vendor_id ==0) {261 usb_log_warning("Missing Vendor ID for Product ID % u\n",266 if (mapping->product_id >= 0 && mapping->vendor_id < 0) { 267 usb_log_warning("Missing Vendor ID for Product ID %d\n", 262 268 mapping->product_id); 263 269 return EINVAL; … … 267 273 matched = false; 268 274 269 if (mapping->vendor_id != 0) {270 assert(mapping->product_id != 0);275 if (mapping->vendor_id >= 0) { 276 assert(mapping->product_id >= 0); 271 277 usb_log_debug("Comparing device against vendor ID %u" 272 278 " and product ID %u.\n", mapping->vendor_id, … … 341 347 } 342 348 343 hid_dev-> parser= (usb_hid_report_t *)(malloc(sizeof(349 hid_dev->report = (usb_hid_report_t *)(malloc(sizeof( 344 350 usb_hid_report_t))); 345 if (hid_dev-> parser== NULL) {351 if (hid_dev->report == NULL) { 346 352 usb_log_fatal("No memory!\n"); 347 353 free(hid_dev); … … 385 391 /* Get the report descriptor and parse it. */ 386 392 rc = usb_hid_process_report_descriptor(hid_dev->usb_dev, 387 hid_dev-> parser);393 hid_dev->report); 388 394 389 395 bool fallback = false; … … 583 589 584 590 // destroy the parser 585 if ((*hid_dev)-> parser!= NULL) {586 usb_hid_free_report((*hid_dev)-> parser);591 if ((*hid_dev)->report != NULL) { 592 usb_hid_free_report((*hid_dev)->report); 587 593 } 588 594 -
uspace/drv/usbhid/usbhid.h
r1553cbf rcf2ccd4 91 91 92 92 /** HID Report parser. */ 93 usb_hid_report_t * parser;93 usb_hid_report_t *report; 94 94 95 95 /** Arbitrary data (e.g. a special structure for handling keyboard). */
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