1 /* 2 * The input core 3 * 4 * Copyright (c) 1999-2002 Vojtech Pavlik 5 */ 6 7 /* 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 as published by 10 * the Free Software Foundation. 11 */ 12 13 #include <linux/init.h> 14 #include <linux/smp_lock.h> 15 #include <linux/input.h> 16 #include <linux/module.h> 17 #include <linux/random.h> 18 #include <linux/major.h> 19 #include <linux/proc_fs.h> 20 #include <linux/seq_file.h> 21 #include <linux/interrupt.h> 22 #include <linux/poll.h> 23 #include <linux/device.h> 24 #include <linux/mutex.h> 25 26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); 27 MODULE_DESCRIPTION("Input core"); 28 MODULE_LICENSE("GPL"); 29 30 #define INPUT_DEVICES 256 31 32 static LIST_HEAD(input_dev_list); 33 static LIST_HEAD(input_handler_list); 34 35 static struct input_handler *input_table[8]; 36 37 /** 38 * input_event() - report new input event 39 * @dev: device that generated the event 40 * @type: type of the event 41 * @code: event code 42 * @value: value of the event 43 * 44 * This function should be used by drivers implementing various input devices 45 * See also input_inject_event() 46 */ 47 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 48 { 49 struct input_handle *handle; 50 51 if (type > EV_MAX || !test_bit(type, dev->evbit)) 52 return; 53 54 add_input_randomness(type, code, value); 55 56 switch (type) { 57 58 case EV_SYN: 59 switch (code) { 60 case SYN_CONFIG: 61 if (dev->event) 62 dev->event(dev, type, code, value); 63 break; 64 65 case SYN_REPORT: 66 if (dev->sync) 67 return; 68 dev->sync = 1; 69 break; 70 } 71 break; 72 73 case EV_KEY: 74 75 if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value) 76 return; 77 78 if (value == 2) 79 break; 80 81 change_bit(code, dev->key); 82 83 if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) { 84 dev->repeat_key = code; 85 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); 86 } 87 88 break; 89 90 case EV_SW: 91 92 if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value) 93 return; 94 95 change_bit(code, dev->sw); 96 97 break; 98 99 case EV_ABS: 100 101 if (code > ABS_MAX || !test_bit(code, dev->absbit)) 102 return; 103 104 if (dev->absfuzz[code]) { 105 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) && 106 (value < dev->abs[code] + (dev->absfuzz[code] >> 1))) 107 return; 108 109 if ((value > dev->abs[code] - dev->absfuzz[code]) && 110 (value < dev->abs[code] + dev->absfuzz[code])) 111 value = (dev->abs[code] * 3 + value) >> 2; 112 113 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) && 114 (value < dev->abs[code] + (dev->absfuzz[code] << 1))) 115 value = (dev->abs[code] + value) >> 1; 116 } 117 118 if (dev->abs[code] == value) 119 return; 120 121 dev->abs[code] = value; 122 break; 123 124 case EV_REL: 125 126 if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0)) 127 return; 128 129 break; 130 131 case EV_MSC: 132 133 if (code > MSC_MAX || !test_bit(code, dev->mscbit)) 134 return; 135 136 if (dev->event) 137 dev->event(dev, type, code, value); 138 139 break; 140 141 case EV_LED: 142 143 if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value) 144 return; 145 146 change_bit(code, dev->led); 147 148 if (dev->event) 149 dev->event(dev, type, code, value); 150 151 break; 152 153 case EV_SND: 154 155 if (code > SND_MAX || !test_bit(code, dev->sndbit)) 156 return; 157 158 if (!!test_bit(code, dev->snd) != !!value) 159 change_bit(code, dev->snd); 160 161 if (dev->event) 162 dev->event(dev, type, code, value); 163 164 break; 165 166 case EV_REP: 167 168 if (code > REP_MAX || value < 0 || dev->rep[code] == value) 169 return; 170 171 dev->rep[code] = value; 172 if (dev->event) 173 dev->event(dev, type, code, value); 174 175 break; 176 177 case EV_FF: 178 179 if (value < 0) 180 return; 181 182 if (dev->event) 183 dev->event(dev, type, code, value); 184 break; 185 } 186 187 if (type != EV_SYN) 188 dev->sync = 0; 189 190 if (dev->grab) 191 dev->grab->handler->event(dev->grab, type, code, value); 192 else 193 list_for_each_entry(handle, &dev->h_list, d_node) 194 if (handle->open) 195 handle->handler->event(handle, type, code, value); 196 } 197 EXPORT_SYMBOL(input_event); 198 199 /** 200 * input_inject_event() - send input event from input handler 201 * @handle: input handle to send event through 202 * @type: type of the event 203 * @code: event code 204 * @value: value of the event 205 * 206 * Similar to input_event() but will ignore event if device is "grabbed" and handle 207 * injecting event is not the one that owns the device. 208 */ 209 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) 210 { 211 if (!handle->dev->grab || handle->dev->grab == handle) 212 input_event(handle->dev, type, code, value); 213 } 214 EXPORT_SYMBOL(input_inject_event); 215 216 static void input_repeat_key(unsigned long data) 217 { 218 struct input_dev *dev = (void *) data; 219 220 if (!test_bit(dev->repeat_key, dev->key)) 221 return; 222 223 input_event(dev, EV_KEY, dev->repeat_key, 2); 224 input_sync(dev); 225 226 if (dev->rep[REP_PERIOD]) 227 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD])); 228 } 229 230 int input_grab_device(struct input_handle *handle) 231 { 232 if (handle->dev->grab) 233 return -EBUSY; 234 235 handle->dev->grab = handle; 236 return 0; 237 } 238 EXPORT_SYMBOL(input_grab_device); 239 240 void input_release_device(struct input_handle *handle) 241 { 242 struct input_dev *dev = handle->dev; 243 244 if (dev->grab == handle) { 245 dev->grab = NULL; 246 247 list_for_each_entry(handle, &dev->h_list, d_node) 248 if (handle->handler->start) 249 handle->handler->start(handle); 250 } 251 } 252 EXPORT_SYMBOL(input_release_device); 253 254 int input_open_device(struct input_handle *handle) 255 { 256 struct input_dev *dev = handle->dev; 257 int err; 258 259 err = mutex_lock_interruptible(&dev->mutex); 260 if (err) 261 return err; 262 263 handle->open++; 264 265 if (!dev->users++ && dev->open) 266 err = dev->open(dev); 267 268 if (err) 269 handle->open--; 270 271 mutex_unlock(&dev->mutex); 272 273 return err; 274 } 275 EXPORT_SYMBOL(input_open_device); 276 277 int input_flush_device(struct input_handle* handle, struct file* file) 278 { 279 if (handle->dev->flush) 280 return handle->dev->flush(handle->dev, file); 281 282 return 0; 283 } 284 EXPORT_SYMBOL(input_flush_device); 285 286 void input_close_device(struct input_handle *handle) 287 { 288 struct input_dev *dev = handle->dev; 289 290 input_release_device(handle); 291 292 mutex_lock(&dev->mutex); 293 294 if (!--dev->users && dev->close) 295 dev->close(dev); 296 handle->open--; 297 298 mutex_unlock(&dev->mutex); 299 } 300 EXPORT_SYMBOL(input_close_device); 301 302 static void input_link_handle(struct input_handle *handle) 303 { 304 list_add_tail(&handle->d_node, &handle->dev->h_list); 305 list_add_tail(&handle->h_node, &handle->handler->h_list); 306 } 307 308 #define MATCH_BIT(bit, max) \ 309 for (i = 0; i < NBITS(max); i++) \ 310 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ 311 break; \ 312 if (i != NBITS(max)) \ 313 continue; 314 315 static const struct input_device_id *input_match_device(const struct input_device_id *id, 316 struct input_dev *dev) 317 { 318 int i; 319 320 for (; id->flags || id->driver_info; id++) { 321 322 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) 323 if (id->bustype != dev->id.bustype) 324 continue; 325 326 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) 327 if (id->vendor != dev->id.vendor) 328 continue; 329 330 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) 331 if (id->product != dev->id.product) 332 continue; 333 334 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) 335 if (id->version != dev->id.version) 336 continue; 337 338 MATCH_BIT(evbit, EV_MAX); 339 MATCH_BIT(keybit, KEY_MAX); 340 MATCH_BIT(relbit, REL_MAX); 341 MATCH_BIT(absbit, ABS_MAX); 342 MATCH_BIT(mscbit, MSC_MAX); 343 MATCH_BIT(ledbit, LED_MAX); 344 MATCH_BIT(sndbit, SND_MAX); 345 MATCH_BIT(ffbit, FF_MAX); 346 MATCH_BIT(swbit, SW_MAX); 347 348 return id; 349 } 350 351 return NULL; 352 } 353 354 #ifdef CONFIG_PROC_FS 355 356 static struct proc_dir_entry *proc_bus_input_dir; 357 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); 358 static int input_devices_state; 359 360 static inline void input_wakeup_procfs_readers(void) 361 { 362 input_devices_state++; 363 wake_up(&input_devices_poll_wait); 364 } 365 366 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) 367 { 368 int state = input_devices_state; 369 370 poll_wait(file, &input_devices_poll_wait, wait); 371 if (state != input_devices_state) 372 return POLLIN | POLLRDNORM; 373 374 return 0; 375 } 376 377 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos) 378 { 379 struct list_head *node; 380 loff_t i = 0; 381 382 list_for_each(node, list) 383 if (i++ == *pos) 384 return node; 385 386 return NULL; 387 } 388 389 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos) 390 { 391 if (element->next == list) 392 return NULL; 393 394 ++(*pos); 395 return element->next; 396 } 397 398 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) 399 { 400 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */ 401 402 return list_get_nth_element(&input_dev_list, pos); 403 } 404 405 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) 406 { 407 return list_get_next_element(&input_dev_list, v, pos); 408 } 409 410 static void input_devices_seq_stop(struct seq_file *seq, void *v) 411 { 412 /* release lock here */ 413 } 414 415 static void input_seq_print_bitmap(struct seq_file *seq, const char *name, 416 unsigned long *bitmap, int max) 417 { 418 int i; 419 420 for (i = NBITS(max) - 1; i > 0; i--) 421 if (bitmap[i]) 422 break; 423 424 seq_printf(seq, "B: %s=", name); 425 for (; i >= 0; i--) 426 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); 427 seq_putc(seq, '\n'); 428 } 429 430 static int input_devices_seq_show(struct seq_file *seq, void *v) 431 { 432 struct input_dev *dev = container_of(v, struct input_dev, node); 433 const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL); 434 struct input_handle *handle; 435 436 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", 437 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); 438 439 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); 440 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); 441 seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); 442 seq_printf(seq, "H: Handlers="); 443 444 list_for_each_entry(handle, &dev->h_list, d_node) 445 seq_printf(seq, "%s ", handle->name); 446 seq_putc(seq, '\n'); 447 448 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); 449 if (test_bit(EV_KEY, dev->evbit)) 450 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); 451 if (test_bit(EV_REL, dev->evbit)) 452 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); 453 if (test_bit(EV_ABS, dev->evbit)) 454 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); 455 if (test_bit(EV_MSC, dev->evbit)) 456 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); 457 if (test_bit(EV_LED, dev->evbit)) 458 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); 459 if (test_bit(EV_SND, dev->evbit)) 460 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); 461 if (test_bit(EV_FF, dev->evbit)) 462 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); 463 if (test_bit(EV_SW, dev->evbit)) 464 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); 465 466 seq_putc(seq, '\n'); 467 468 kfree(path); 469 return 0; 470 } 471 472 static struct seq_operations input_devices_seq_ops = { 473 .start = input_devices_seq_start, 474 .next = input_devices_seq_next, 475 .stop = input_devices_seq_stop, 476 .show = input_devices_seq_show, 477 }; 478 479 static int input_proc_devices_open(struct inode *inode, struct file *file) 480 { 481 return seq_open(file, &input_devices_seq_ops); 482 } 483 484 static const struct file_operations input_devices_fileops = { 485 .owner = THIS_MODULE, 486 .open = input_proc_devices_open, 487 .poll = input_proc_devices_poll, 488 .read = seq_read, 489 .llseek = seq_lseek, 490 .release = seq_release, 491 }; 492 493 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) 494 { 495 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */ 496 seq->private = (void *)(unsigned long)*pos; 497 return list_get_nth_element(&input_handler_list, pos); 498 } 499 500 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) 501 { 502 seq->private = (void *)(unsigned long)(*pos + 1); 503 return list_get_next_element(&input_handler_list, v, pos); 504 } 505 506 static void input_handlers_seq_stop(struct seq_file *seq, void *v) 507 { 508 /* release lock here */ 509 } 510 511 static int input_handlers_seq_show(struct seq_file *seq, void *v) 512 { 513 struct input_handler *handler = container_of(v, struct input_handler, node); 514 515 seq_printf(seq, "N: Number=%ld Name=%s", 516 (unsigned long)seq->private, handler->name); 517 if (handler->fops) 518 seq_printf(seq, " Minor=%d", handler->minor); 519 seq_putc(seq, '\n'); 520 521 return 0; 522 } 523 static struct seq_operations input_handlers_seq_ops = { 524 .start = input_handlers_seq_start, 525 .next = input_handlers_seq_next, 526 .stop = input_handlers_seq_stop, 527 .show = input_handlers_seq_show, 528 }; 529 530 static int input_proc_handlers_open(struct inode *inode, struct file *file) 531 { 532 return seq_open(file, &input_handlers_seq_ops); 533 } 534 535 static const struct file_operations input_handlers_fileops = { 536 .owner = THIS_MODULE, 537 .open = input_proc_handlers_open, 538 .read = seq_read, 539 .llseek = seq_lseek, 540 .release = seq_release, 541 }; 542 543 static int __init input_proc_init(void) 544 { 545 struct proc_dir_entry *entry; 546 547 proc_bus_input_dir = proc_mkdir("input", proc_bus); 548 if (!proc_bus_input_dir) 549 return -ENOMEM; 550 551 proc_bus_input_dir->owner = THIS_MODULE; 552 553 entry = create_proc_entry("devices", 0, proc_bus_input_dir); 554 if (!entry) 555 goto fail1; 556 557 entry->owner = THIS_MODULE; 558 entry->proc_fops = &input_devices_fileops; 559 560 entry = create_proc_entry("handlers", 0, proc_bus_input_dir); 561 if (!entry) 562 goto fail2; 563 564 entry->owner = THIS_MODULE; 565 entry->proc_fops = &input_handlers_fileops; 566 567 return 0; 568 569 fail2: remove_proc_entry("devices", proc_bus_input_dir); 570 fail1: remove_proc_entry("input", proc_bus); 571 return -ENOMEM; 572 } 573 574 static void input_proc_exit(void) 575 { 576 remove_proc_entry("devices", proc_bus_input_dir); 577 remove_proc_entry("handlers", proc_bus_input_dir); 578 remove_proc_entry("input", proc_bus); 579 } 580 581 #else /* !CONFIG_PROC_FS */ 582 static inline void input_wakeup_procfs_readers(void) { } 583 static inline int input_proc_init(void) { return 0; } 584 static inline void input_proc_exit(void) { } 585 #endif 586 587 #define INPUT_DEV_STRING_ATTR_SHOW(name) \ 588 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \ 589 { \ 590 struct input_dev *input_dev = to_input_dev(dev); \ 591 int retval; \ 592 \ 593 retval = mutex_lock_interruptible(&input_dev->mutex); \ 594 if (retval) \ 595 return retval; \ 596 \ 597 retval = scnprintf(buf, PAGE_SIZE, \ 598 "%s\n", input_dev->name ? input_dev->name : ""); \ 599 \ 600 mutex_unlock(&input_dev->mutex); \ 601 \ 602 return retval; \ 603 } \ 604 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL); 605 606 INPUT_DEV_STRING_ATTR_SHOW(name); 607 INPUT_DEV_STRING_ATTR_SHOW(phys); 608 INPUT_DEV_STRING_ATTR_SHOW(uniq); 609 610 static int input_print_modalias_bits(char *buf, int size, 611 char name, unsigned long *bm, 612 unsigned int min_bit, unsigned int max_bit) 613 { 614 int len = 0, i; 615 616 len += snprintf(buf, max(size, 0), "%c", name); 617 for (i = min_bit; i < max_bit; i++) 618 if (bm[LONG(i)] & BIT(i)) 619 len += snprintf(buf + len, max(size - len, 0), "%X,", i); 620 return len; 621 } 622 623 static int input_print_modalias(char *buf, int size, struct input_dev *id, 624 int add_cr) 625 { 626 int len; 627 628 len = snprintf(buf, max(size, 0), 629 "input:b%04Xv%04Xp%04Xe%04X-", 630 id->id.bustype, id->id.vendor, 631 id->id.product, id->id.version); 632 633 len += input_print_modalias_bits(buf + len, size - len, 634 'e', id->evbit, 0, EV_MAX); 635 len += input_print_modalias_bits(buf + len, size - len, 636 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); 637 len += input_print_modalias_bits(buf + len, size - len, 638 'r', id->relbit, 0, REL_MAX); 639 len += input_print_modalias_bits(buf + len, size - len, 640 'a', id->absbit, 0, ABS_MAX); 641 len += input_print_modalias_bits(buf + len, size - len, 642 'm', id->mscbit, 0, MSC_MAX); 643 len += input_print_modalias_bits(buf + len, size - len, 644 'l', id->ledbit, 0, LED_MAX); 645 len += input_print_modalias_bits(buf + len, size - len, 646 's', id->sndbit, 0, SND_MAX); 647 len += input_print_modalias_bits(buf + len, size - len, 648 'f', id->ffbit, 0, FF_MAX); 649 len += input_print_modalias_bits(buf + len, size - len, 650 'w', id->swbit, 0, SW_MAX); 651 652 if (add_cr) 653 len += snprintf(buf + len, max(size - len, 0), "\n"); 654 655 return len; 656 } 657 658 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf) 659 { 660 struct input_dev *id = to_input_dev(dev); 661 ssize_t len; 662 663 len = input_print_modalias(buf, PAGE_SIZE, id, 1); 664 665 return min_t(int, len, PAGE_SIZE); 666 } 667 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); 668 669 static struct attribute *input_dev_attrs[] = { 670 &class_device_attr_name.attr, 671 &class_device_attr_phys.attr, 672 &class_device_attr_uniq.attr, 673 &class_device_attr_modalias.attr, 674 NULL 675 }; 676 677 static struct attribute_group input_dev_attr_group = { 678 .attrs = input_dev_attrs, 679 }; 680 681 #define INPUT_DEV_ID_ATTR(name) \ 682 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \ 683 { \ 684 struct input_dev *input_dev = to_input_dev(dev); \ 685 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ 686 } \ 687 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL); 688 689 INPUT_DEV_ID_ATTR(bustype); 690 INPUT_DEV_ID_ATTR(vendor); 691 INPUT_DEV_ID_ATTR(product); 692 INPUT_DEV_ID_ATTR(version); 693 694 static struct attribute *input_dev_id_attrs[] = { 695 &class_device_attr_bustype.attr, 696 &class_device_attr_vendor.attr, 697 &class_device_attr_product.attr, 698 &class_device_attr_version.attr, 699 NULL 700 }; 701 702 static struct attribute_group input_dev_id_attr_group = { 703 .name = "id", 704 .attrs = input_dev_id_attrs, 705 }; 706 707 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, 708 int max, int add_cr) 709 { 710 int i; 711 int len = 0; 712 713 for (i = NBITS(max) - 1; i > 0; i--) 714 if (bitmap[i]) 715 break; 716 717 for (; i >= 0; i--) 718 len += snprintf(buf + len, max(buf_size - len, 0), 719 "%lx%s", bitmap[i], i > 0 ? " " : ""); 720 721 if (add_cr) 722 len += snprintf(buf + len, max(buf_size - len, 0), "\n"); 723 724 return len; 725 } 726 727 #define INPUT_DEV_CAP_ATTR(ev, bm) \ 728 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \ 729 { \ 730 struct input_dev *input_dev = to_input_dev(dev); \ 731 int len = input_print_bitmap(buf, PAGE_SIZE, \ 732 input_dev->bm##bit, ev##_MAX, 1); \ 733 return min_t(int, len, PAGE_SIZE); \ 734 } \ 735 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL); 736 737 INPUT_DEV_CAP_ATTR(EV, ev); 738 INPUT_DEV_CAP_ATTR(KEY, key); 739 INPUT_DEV_CAP_ATTR(REL, rel); 740 INPUT_DEV_CAP_ATTR(ABS, abs); 741 INPUT_DEV_CAP_ATTR(MSC, msc); 742 INPUT_DEV_CAP_ATTR(LED, led); 743 INPUT_DEV_CAP_ATTR(SND, snd); 744 INPUT_DEV_CAP_ATTR(FF, ff); 745 INPUT_DEV_CAP_ATTR(SW, sw); 746 747 static struct attribute *input_dev_caps_attrs[] = { 748 &class_device_attr_ev.attr, 749 &class_device_attr_key.attr, 750 &class_device_attr_rel.attr, 751 &class_device_attr_abs.attr, 752 &class_device_attr_msc.attr, 753 &class_device_attr_led.attr, 754 &class_device_attr_snd.attr, 755 &class_device_attr_ff.attr, 756 &class_device_attr_sw.attr, 757 NULL 758 }; 759 760 static struct attribute_group input_dev_caps_attr_group = { 761 .name = "capabilities", 762 .attrs = input_dev_caps_attrs, 763 }; 764 765 static void input_dev_release(struct class_device *class_dev) 766 { 767 struct input_dev *dev = to_input_dev(class_dev); 768 769 input_ff_destroy(dev); 770 kfree(dev); 771 772 module_put(THIS_MODULE); 773 } 774 775 /* 776 * Input uevent interface - loading event handlers based on 777 * device bitfields. 778 */ 779 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index, 780 char *buffer, int buffer_size, int *cur_len, 781 const char *name, unsigned long *bitmap, int max) 782 { 783 if (*cur_index >= num_envp - 1) 784 return -ENOMEM; 785 786 envp[*cur_index] = buffer + *cur_len; 787 788 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name); 789 if (*cur_len >= buffer_size) 790 return -ENOMEM; 791 792 *cur_len += input_print_bitmap(buffer + *cur_len, 793 max(buffer_size - *cur_len, 0), 794 bitmap, max, 0) + 1; 795 if (*cur_len > buffer_size) 796 return -ENOMEM; 797 798 (*cur_index)++; 799 return 0; 800 } 801 802 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index, 803 char *buffer, int buffer_size, int *cur_len, 804 struct input_dev *dev) 805 { 806 if (*cur_index >= num_envp - 1) 807 return -ENOMEM; 808 809 envp[*cur_index] = buffer + *cur_len; 810 811 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), 812 "MODALIAS="); 813 if (*cur_len >= buffer_size) 814 return -ENOMEM; 815 816 *cur_len += input_print_modalias(buffer + *cur_len, 817 max(buffer_size - *cur_len, 0), 818 dev, 0) + 1; 819 if (*cur_len > buffer_size) 820 return -ENOMEM; 821 822 (*cur_index)++; 823 return 0; 824 } 825 826 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ 827 do { \ 828 int err = add_uevent_var(envp, num_envp, &i, \ 829 buffer, buffer_size, &len, \ 830 fmt, val); \ 831 if (err) \ 832 return err; \ 833 } while (0) 834 835 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ 836 do { \ 837 int err = input_add_uevent_bm_var(envp, num_envp, &i, \ 838 buffer, buffer_size, &len, \ 839 name, bm, max); \ 840 if (err) \ 841 return err; \ 842 } while (0) 843 844 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ 845 do { \ 846 int err = input_add_uevent_modalias_var(envp, \ 847 num_envp, &i, \ 848 buffer, buffer_size, &len, \ 849 dev); \ 850 if (err) \ 851 return err; \ 852 } while (0) 853 854 static int input_dev_uevent(struct class_device *cdev, char **envp, 855 int num_envp, char *buffer, int buffer_size) 856 { 857 struct input_dev *dev = to_input_dev(cdev); 858 int i = 0; 859 int len = 0; 860 861 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", 862 dev->id.bustype, dev->id.vendor, 863 dev->id.product, dev->id.version); 864 if (dev->name) 865 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); 866 if (dev->phys) 867 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); 868 if (dev->uniq) 869 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); 870 871 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); 872 if (test_bit(EV_KEY, dev->evbit)) 873 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); 874 if (test_bit(EV_REL, dev->evbit)) 875 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); 876 if (test_bit(EV_ABS, dev->evbit)) 877 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); 878 if (test_bit(EV_MSC, dev->evbit)) 879 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); 880 if (test_bit(EV_LED, dev->evbit)) 881 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); 882 if (test_bit(EV_SND, dev->evbit)) 883 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); 884 if (test_bit(EV_FF, dev->evbit)) 885 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); 886 if (test_bit(EV_SW, dev->evbit)) 887 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); 888 889 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); 890 891 envp[i] = NULL; 892 return 0; 893 } 894 895 struct class input_class = { 896 .name = "input", 897 .release = input_dev_release, 898 .uevent = input_dev_uevent, 899 }; 900 EXPORT_SYMBOL_GPL(input_class); 901 902 /** 903 * input_allocate_device - allocate memory for new input device 904 * 905 * Returns prepared struct input_dev or NULL. 906 * 907 * NOTE: Use input_free_device() to free devices that have not been 908 * registered; input_unregister_device() should be used for already 909 * registered devices. 910 */ 911 struct input_dev *input_allocate_device(void) 912 { 913 struct input_dev *dev; 914 915 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); 916 if (dev) { 917 dev->cdev.class = &input_class; 918 class_device_initialize(&dev->cdev); 919 mutex_init(&dev->mutex); 920 INIT_LIST_HEAD(&dev->h_list); 921 INIT_LIST_HEAD(&dev->node); 922 923 __module_get(THIS_MODULE); 924 } 925 926 return dev; 927 } 928 EXPORT_SYMBOL(input_allocate_device); 929 930 /** 931 * input_free_device - free memory occupied by input_dev structure 932 * @dev: input device to free 933 * 934 * This function should only be used if input_register_device() 935 * was not called yet or if it failed. Once device was registered 936 * use input_unregister_device() and memory will be freed once last 937 * refrence to the device is dropped. 938 * 939 * Device should be allocated by input_allocate_device(). 940 * 941 * NOTE: If there are references to the input device then memory 942 * will not be freed until last reference is dropped. 943 */ 944 void input_free_device(struct input_dev *dev) 945 { 946 if (dev) { 947 948 mutex_lock(&dev->mutex); 949 dev->name = dev->phys = dev->uniq = NULL; 950 mutex_unlock(&dev->mutex); 951 952 input_put_device(dev); 953 } 954 } 955 EXPORT_SYMBOL(input_free_device); 956 957 int input_register_device(struct input_dev *dev) 958 { 959 static atomic_t input_no = ATOMIC_INIT(0); 960 struct input_handle *handle; 961 struct input_handler *handler; 962 const struct input_device_id *id; 963 const char *path; 964 int error; 965 966 set_bit(EV_SYN, dev->evbit); 967 968 /* 969 * If delay and period are pre-set by the driver, then autorepeating 970 * is handled by the driver itself and we don't do it in input.c. 971 */ 972 973 init_timer(&dev->timer); 974 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { 975 dev->timer.data = (long) dev; 976 dev->timer.function = input_repeat_key; 977 dev->rep[REP_DELAY] = 250; 978 dev->rep[REP_PERIOD] = 33; 979 } 980 981 list_add_tail(&dev->node, &input_dev_list); 982 983 snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id), 984 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1); 985 986 error = class_device_add(&dev->cdev); 987 if (error) 988 return error; 989 990 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group); 991 if (error) 992 goto fail1; 993 994 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group); 995 if (error) 996 goto fail2; 997 998 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group); 999 if (error) 1000 goto fail3; 1001 1002 path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL); 1003 printk(KERN_INFO "input: %s as %s\n", 1004 dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); 1005 kfree(path); 1006 1007 list_for_each_entry(handler, &input_handler_list, node) 1008 if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) 1009 if ((id = input_match_device(handler->id_table, dev))) 1010 if ((handle = handler->connect(handler, dev, id))) { 1011 input_link_handle(handle); 1012 if (handler->start) 1013 handler->start(handle); 1014 } 1015 1016 input_wakeup_procfs_readers(); 1017 1018 return 0; 1019 1020 fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group); 1021 fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group); 1022 fail1: class_device_del(&dev->cdev); 1023 return error; 1024 } 1025 EXPORT_SYMBOL(input_register_device); 1026 1027 void input_unregister_device(struct input_dev *dev) 1028 { 1029 struct list_head *node, *next; 1030 int code; 1031 1032 for (code = 0; code <= KEY_MAX; code++) 1033 if (test_bit(code, dev->key)) 1034 input_report_key(dev, code, 0); 1035 input_sync(dev); 1036 1037 del_timer_sync(&dev->timer); 1038 1039 list_for_each_safe(node, next, &dev->h_list) { 1040 struct input_handle * handle = to_handle(node); 1041 list_del_init(&handle->d_node); 1042 list_del_init(&handle->h_node); 1043 handle->handler->disconnect(handle); 1044 } 1045 1046 list_del_init(&dev->node); 1047 1048 sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group); 1049 sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group); 1050 sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group); 1051 1052 mutex_lock(&dev->mutex); 1053 dev->name = dev->phys = dev->uniq = NULL; 1054 mutex_unlock(&dev->mutex); 1055 1056 class_device_unregister(&dev->cdev); 1057 1058 input_wakeup_procfs_readers(); 1059 } 1060 EXPORT_SYMBOL(input_unregister_device); 1061 1062 int input_register_handler(struct input_handler *handler) 1063 { 1064 struct input_dev *dev; 1065 struct input_handle *handle; 1066 const struct input_device_id *id; 1067 1068 INIT_LIST_HEAD(&handler->h_list); 1069 1070 if (handler->fops != NULL) { 1071 if (input_table[handler->minor >> 5]) 1072 return -EBUSY; 1073 1074 input_table[handler->minor >> 5] = handler; 1075 } 1076 1077 list_add_tail(&handler->node, &input_handler_list); 1078 1079 list_for_each_entry(dev, &input_dev_list, node) 1080 if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) 1081 if ((id = input_match_device(handler->id_table, dev))) 1082 if ((handle = handler->connect(handler, dev, id))) { 1083 input_link_handle(handle); 1084 if (handler->start) 1085 handler->start(handle); 1086 } 1087 1088 input_wakeup_procfs_readers(); 1089 return 0; 1090 } 1091 EXPORT_SYMBOL(input_register_handler); 1092 1093 void input_unregister_handler(struct input_handler *handler) 1094 { 1095 struct list_head *node, *next; 1096 1097 list_for_each_safe(node, next, &handler->h_list) { 1098 struct input_handle * handle = to_handle_h(node); 1099 list_del_init(&handle->h_node); 1100 list_del_init(&handle->d_node); 1101 handler->disconnect(handle); 1102 } 1103 1104 list_del_init(&handler->node); 1105 1106 if (handler->fops != NULL) 1107 input_table[handler->minor >> 5] = NULL; 1108 1109 input_wakeup_procfs_readers(); 1110 } 1111 EXPORT_SYMBOL(input_unregister_handler); 1112 1113 static int input_open_file(struct inode *inode, struct file *file) 1114 { 1115 struct input_handler *handler = input_table[iminor(inode) >> 5]; 1116 const struct file_operations *old_fops, *new_fops = NULL; 1117 int err; 1118 1119 /* No load-on-demand here? */ 1120 if (!handler || !(new_fops = fops_get(handler->fops))) 1121 return -ENODEV; 1122 1123 /* 1124 * That's _really_ odd. Usually NULL ->open means "nothing special", 1125 * not "no device". Oh, well... 1126 */ 1127 if (!new_fops->open) { 1128 fops_put(new_fops); 1129 return -ENODEV; 1130 } 1131 old_fops = file->f_op; 1132 file->f_op = new_fops; 1133 1134 err = new_fops->open(inode, file); 1135 1136 if (err) { 1137 fops_put(file->f_op); 1138 file->f_op = fops_get(old_fops); 1139 } 1140 fops_put(old_fops); 1141 return err; 1142 } 1143 1144 static const struct file_operations input_fops = { 1145 .owner = THIS_MODULE, 1146 .open = input_open_file, 1147 }; 1148 1149 static int __init input_init(void) 1150 { 1151 int err; 1152 1153 err = class_register(&input_class); 1154 if (err) { 1155 printk(KERN_ERR "input: unable to register input_dev class\n"); 1156 return err; 1157 } 1158 1159 err = input_proc_init(); 1160 if (err) 1161 goto fail1; 1162 1163 err = register_chrdev(INPUT_MAJOR, "input", &input_fops); 1164 if (err) { 1165 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); 1166 goto fail2; 1167 } 1168 1169 return 0; 1170 1171 fail2: input_proc_exit(); 1172 fail1: class_unregister(&input_class); 1173 return err; 1174 } 1175 1176 static void __exit input_exit(void) 1177 { 1178 input_proc_exit(); 1179 unregister_chrdev(INPUT_MAJOR, "input"); 1180 class_unregister(&input_class); 1181 } 1182 1183 subsys_initcall(input_init); 1184 module_exit(input_exit); 1185