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