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