drivers/input/input.c

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