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  * @handle: 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 struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
 317 {
 318         int i;
 319
 320         for (; id->flags || id->driver_info; id++) {
 321
 322                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 323                         if (id->bustype != dev->id.bustype)
 324                                 continue;
 325
 326                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 327                         if (id->vendor != dev->id.vendor)
 328                                 continue;
 329
 330                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 331                         if (id->product != dev->id.product)
 332                                 continue;
 333
 334                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 335                         if (id->version != dev->id.version)
 336                                 continue;
 337
 338                 MATCH_BIT(evbit,  EV_MAX);
 339                 MATCH_BIT(keybit, KEY_MAX);
 340                 MATCH_BIT(relbit, REL_MAX);
 341                 MATCH_BIT(absbit, ABS_MAX);
 342                 MATCH_BIT(mscbit, MSC_MAX);
 343                 MATCH_BIT(ledbit, LED_MAX);
 344                 MATCH_BIT(sndbit, SND_MAX);
 345                 MATCH_BIT(ffbit,  FF_MAX);
 346                 MATCH_BIT(swbit,  SW_MAX);
 347
 348                 return id;
 349         }
 350
 351         return NULL;
 352 }
 353
 354 #ifdef CONFIG_PROC_FS
 355
 356 static struct proc_dir_entry *proc_bus_input_dir;
 357 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
 358 static int input_devices_state;
 359
 360 static inline void input_wakeup_procfs_readers(void)
 361 {
 362         input_devices_state++;
 363         wake_up(&input_devices_poll_wait);
 364 }
 365
 366 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
 367 {
 368         int state = input_devices_state;
 369
 370         poll_wait(file, &input_devices_poll_wait, wait);
 371         if (state != input_devices_state)
 372                 return POLLIN | POLLRDNORM;
 373
 374         return 0;
 375 }
 376
 377 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
 378 {
 379         struct list_head *node;
 380         loff_t i = 0;
 381
 382         list_for_each(node, list)
 383                 if (i++ == *pos)
 384                         return node;
 385
 386         return NULL;
 387 }
 388
 389 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
 390 {
 391         if (element->next == list)
 392                 return NULL;
 393
 394         ++(*pos);
 395         return element->next;
 396 }
 397
 398 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
 399 {
 400         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 401
 402         return list_get_nth_element(&input_dev_list, pos);
 403 }
 404
 405 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 406 {
 407         return list_get_next_element(&input_dev_list, v, pos);
 408 }
 409
 410 static void input_devices_seq_stop(struct seq_file *seq, void *v)
 411 {
 412         /* release lock here */
 413 }
 414
 415 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
 416                                    unsigned long *bitmap, int max)
 417 {
 418         int i;
 419
 420         for (i = NBITS(max) - 1; i > 0; i--)
 421                 if (bitmap[i])
 422                         break;
 423
 424         seq_printf(seq, "B: %s=", name);
 425         for (; i >= 0; i--)
 426                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
 427         seq_putc(seq, '\n');
 428 }
 429
 430 static int input_devices_seq_show(struct seq_file *seq, void *v)
 431 {
 432         struct input_dev *dev = container_of(v, struct input_dev, node);
 433         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 434         struct input_handle *handle;
 435
 436         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 437                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 438
 439         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 440         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 441         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
 442         seq_printf(seq, "H: Handlers=");
 443
 444         list_for_each_entry(handle, &dev->h_list, d_node)
 445                 seq_printf(seq, "%s ", handle->name);
 446         seq_putc(seq, '\n');
 447
 448         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
 449         if (test_bit(EV_KEY, dev->evbit))
 450                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
 451         if (test_bit(EV_REL, dev->evbit))
 452                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
 453         if (test_bit(EV_ABS, dev->evbit))
 454                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
 455         if (test_bit(EV_MSC, dev->evbit))
 456                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
 457         if (test_bit(EV_LED, dev->evbit))
 458                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
 459         if (test_bit(EV_SND, dev->evbit))
 460                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
 461         if (test_bit(EV_FF, dev->evbit))
 462                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
 463         if (test_bit(EV_SW, dev->evbit))
 464                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
 465
 466         seq_putc(seq, '\n');
 467
 468         kfree(path);
 469         return 0;
 470 }
 471
 472 static struct seq_operations input_devices_seq_ops = {
 473         .start  = input_devices_seq_start,
 474         .next   = input_devices_seq_next,
 475         .stop   = input_devices_seq_stop,
 476         .show   = input_devices_seq_show,
 477 };
 478
 479 static int input_proc_devices_open(struct inode *inode, struct file *file)
 480 {
 481         return seq_open(file, &input_devices_seq_ops);
 482 }
 483
 484 static struct file_operations input_devices_fileops = {
 485         .owner          = THIS_MODULE,
 486         .open           = input_proc_devices_open,
 487         .poll           = input_proc_devices_poll,
 488         .read           = seq_read,
 489         .llseek         = seq_lseek,
 490         .release        = seq_release,
 491 };
 492
 493 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
 494 {
 495         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 496         seq->private = (void *)(unsigned long)*pos;
 497         return list_get_nth_element(&input_handler_list, pos);
 498 }
 499
 500 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 501 {
 502         seq->private = (void *)(unsigned long)(*pos + 1);
 503         return list_get_next_element(&input_handler_list, v, pos);
 504 }
 505
 506 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
 507 {
 508         /* release lock here */
 509 }
 510
 511 static int input_handlers_seq_show(struct seq_file *seq, void *v)
 512 {
 513         struct input_handler *handler = container_of(v, struct input_handler, node);
 514
 515         seq_printf(seq, "N: Number=%ld Name=%s",
 516                    (unsigned long)seq->private, handler->name);
 517         if (handler->fops)
 518                 seq_printf(seq, " Minor=%d", handler->minor);
 519         seq_putc(seq, '\n');
 520
 521         return 0;
 522 }
 523 static struct seq_operations input_handlers_seq_ops = {
 524         .start  = input_handlers_seq_start,
 525         .next   = input_handlers_seq_next,
 526         .stop   = input_handlers_seq_stop,
 527         .show   = input_handlers_seq_show,
 528 };
 529
 530 static int input_proc_handlers_open(struct inode *inode, struct file *file)
 531 {
 532         return seq_open(file, &input_handlers_seq_ops);
 533 }
 534
 535 static struct file_operations input_handlers_fileops = {
 536         .owner          = THIS_MODULE,
 537         .open           = input_proc_handlers_open,
 538         .read           = seq_read,
 539         .llseek         = seq_lseek,
 540         .release        = seq_release,
 541 };
 542
 543 static int __init input_proc_init(void)
 544 {
 545         struct proc_dir_entry *entry;
 546
 547         proc_bus_input_dir = proc_mkdir("input", proc_bus);
 548         if (!proc_bus_input_dir)
 549                 return -ENOMEM;
 550
 551         proc_bus_input_dir->owner = THIS_MODULE;
 552
 553         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
 554         if (!entry)
 555                 goto fail1;
 556
 557         entry->owner = THIS_MODULE;
 558         entry->proc_fops = &input_devices_fileops;
 559
 560         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
 561         if (!entry)
 562                 goto fail2;
 563
 564         entry->owner = THIS_MODULE;
 565         entry->proc_fops = &input_handlers_fileops;
 566
 567         return 0;
 568
 569  fail2: remove_proc_entry("devices", proc_bus_input_dir);
 570  fail1: remove_proc_entry("input", proc_bus);
 571         return -ENOMEM;
 572 }
 573
 574 static void input_proc_exit(void)
 575 {
 576         remove_proc_entry("devices", proc_bus_input_dir);
 577         remove_proc_entry("handlers", proc_bus_input_dir);
 578         remove_proc_entry("input", proc_bus);
 579 }
 580
 581 #else /* !CONFIG_PROC_FS */
 582 static inline void input_wakeup_procfs_readers(void) { }
 583 static inline int input_proc_init(void) { return 0; }
 584 static inline void input_proc_exit(void) { }
 585 #endif
 586
 587 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
 588 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
 589 {                                                                               \
 590         struct input_dev *input_dev = to_input_dev(dev);                        \
 591         int retval;                                                             \
 592                                                                                 \
 593         retval = mutex_lock_interruptible(&input_dev->mutex);                   \
 594         if (retval)                                                             \
 595                 return retval;                                                  \
 596                                                                                 \
 597         retval = scnprintf(buf, PAGE_SIZE,                                      \
 598                            "%s\n", input_dev->name ? input_dev->name : "");     \
 599                                                                                 \
 600         mutex_unlock(&input_dev->mutex);                                        \
 601                                                                                 \
 602         return retval;                                                          \
 603 }                                                                               \
 604 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
 605
 606 INPUT_DEV_STRING_ATTR_SHOW(name);
 607 INPUT_DEV_STRING_ATTR_SHOW(phys);
 608 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 609
 610 static int input_print_modalias_bits(char *buf, int size,
 611                                      char name, unsigned long *bm,
 612                                      unsigned int min_bit, unsigned int max_bit)
 613 {
 614         int len = 0, i;
 615
 616         len += snprintf(buf, max(size, 0), "%c", name);
 617         for (i = min_bit; i < max_bit; i++)
 618                 if (bm[LONG(i)] & BIT(i))
 619                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
 620         return len;
 621 }
 622
 623 static int input_print_modalias(char *buf, int size, struct input_dev *id,
 624                                 int add_cr)
 625 {
 626         int len;
 627
 628         len = snprintf(buf, max(size, 0),
 629                        "input:b%04Xv%04Xp%04Xe%04X-",
 630                        id->id.bustype, id->id.vendor,
 631                        id->id.product, id->id.version);
 632
 633         len += input_print_modalias_bits(buf + len, size - len,
 634                                 'e', id->evbit, 0, EV_MAX);
 635         len += input_print_modalias_bits(buf + len, size - len,
 636                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
 637         len += input_print_modalias_bits(buf + len, size - len,
 638                                 'r', id->relbit, 0, REL_MAX);
 639         len += input_print_modalias_bits(buf + len, size - len,
 640                                 'a', id->absbit, 0, ABS_MAX);
 641         len += input_print_modalias_bits(buf + len, size - len,
 642                                 'm', id->mscbit, 0, MSC_MAX);
 643         len += input_print_modalias_bits(buf + len, size - len,
 644                                 'l', id->ledbit, 0, LED_MAX);
 645         len += input_print_modalias_bits(buf + len, size - len,
 646                                 's', id->sndbit, 0, SND_MAX);
 647         len += input_print_modalias_bits(buf + len, size - len,
 648                                 'f', id->ffbit, 0, FF_MAX);
 649         len += input_print_modalias_bits(buf + len, size - len,
 650                                 'w', id->swbit, 0, SW_MAX);
 651
 652         if (add_cr)
 653                 len += snprintf(buf + len, max(size - len, 0), "\n");
 654
 655         return len;
 656 }
 657
 658 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
 659 {
 660         struct input_dev *id = to_input_dev(dev);
 661         ssize_t len;
 662
 663         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
 664
 665         return min_t(int, len, PAGE_SIZE);
 666 }
 667 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 668
 669 static struct attribute *input_dev_attrs[] = {
 670         &class_device_attr_name.attr,
 671         &class_device_attr_phys.attr,
 672         &class_device_attr_uniq.attr,
 673         &class_device_attr_modalias.attr,
 674         NULL
 675 };
 676
 677 static struct attribute_group input_dev_attr_group = {
 678         .attrs  = input_dev_attrs,
 679 };
 680
 681 #define INPUT_DEV_ID_ATTR(name)                                                 \
 682 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
 683 {                                                                               \
 684         struct input_dev *input_dev = to_input_dev(dev);                        \
 685         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
 686 }                                                                               \
 687 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
 688
 689 INPUT_DEV_ID_ATTR(bustype);
 690 INPUT_DEV_ID_ATTR(vendor);
 691 INPUT_DEV_ID_ATTR(product);
 692 INPUT_DEV_ID_ATTR(version);
 693
 694 static struct attribute *input_dev_id_attrs[] = {
 695         &class_device_attr_bustype.attr,
 696         &class_device_attr_vendor.attr,
 697         &class_device_attr_product.attr,
 698         &class_device_attr_version.attr,
 699         NULL
 700 };
 701
 702 static struct attribute_group input_dev_id_attr_group = {
 703         .name   = "id",
 704         .attrs  = input_dev_id_attrs,
 705 };
 706
 707 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
 708                               int max, int add_cr)
 709 {
 710         int i;
 711         int len = 0;
 712
 713         for (i = NBITS(max) - 1; i > 0; i--)
 714                 if (bitmap[i])
 715                         break;
 716
 717         for (; i >= 0; i--)
 718                 len += snprintf(buf + len, max(buf_size - len, 0),
 719                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
 720
 721         if (add_cr)
 722                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
 723
 724         return len;
 725 }
 726
 727 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
 728 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
 729 {                                                                               \
 730         struct input_dev *input_dev = to_input_dev(dev);                        \
 731         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
 732                                      input_dev->bm##bit, ev##_MAX, 1);          \
 733         return min_t(int, len, PAGE_SIZE);                                      \
 734 }                                                                               \
 735 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
 736
 737 INPUT_DEV_CAP_ATTR(EV, ev);
 738 INPUT_DEV_CAP_ATTR(KEY, key);
 739 INPUT_DEV_CAP_ATTR(REL, rel);
 740 INPUT_DEV_CAP_ATTR(ABS, abs);
 741 INPUT_DEV_CAP_ATTR(MSC, msc);
 742 INPUT_DEV_CAP_ATTR(LED, led);
 743 INPUT_DEV_CAP_ATTR(SND, snd);
 744 INPUT_DEV_CAP_ATTR(FF, ff);
 745 INPUT_DEV_CAP_ATTR(SW, sw);
 746
 747 static struct attribute *input_dev_caps_attrs[] = {
 748         &class_device_attr_ev.attr,
 749         &class_device_attr_key.attr,
 750         &class_device_attr_rel.attr,
 751         &class_device_attr_abs.attr,
 752         &class_device_attr_msc.attr,
 753         &class_device_attr_led.attr,
 754         &class_device_attr_snd.attr,
 755         &class_device_attr_ff.attr,
 756         &class_device_attr_sw.attr,
 757         NULL
 758 };
 759
 760 static struct attribute_group input_dev_caps_attr_group = {
 761         .name   = "capabilities",
 762         .attrs  = input_dev_caps_attrs,
 763 };
 764
 765 static void input_dev_release(struct class_device *class_dev)
 766 {
 767         struct input_dev *dev = to_input_dev(class_dev);
 768
 769         input_ff_destroy(dev);
 770         kfree(dev);
 771
 772         module_put(THIS_MODULE);
 773 }
 774
 775 /*
 776  * Input uevent interface - loading event handlers based on
 777  * device bitfields.
 778  */
 779 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
 780                                    char *buffer, int buffer_size, int *cur_len,
 781                                    const char *name, unsigned long *bitmap, int max)
 782 {
 783         if (*cur_index >= num_envp - 1)
 784                 return -ENOMEM;
 785
 786         envp[*cur_index] = buffer + *cur_len;
 787
 788         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
 789         if (*cur_len >= buffer_size)
 790                 return -ENOMEM;
 791
 792         *cur_len += input_print_bitmap(buffer + *cur_len,
 793                                         max(buffer_size - *cur_len, 0),
 794                                         bitmap, max, 0) + 1;
 795         if (*cur_len > buffer_size)
 796                 return -ENOMEM;
 797
 798         (*cur_index)++;
 799         return 0;
 800 }
 801
 802 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
 803                                          char *buffer, int buffer_size, int *cur_len,
 804                                          struct input_dev *dev)
 805 {
 806         if (*cur_index >= num_envp - 1)
 807                 return -ENOMEM;
 808
 809         envp[*cur_index] = buffer + *cur_len;
 810
 811         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
 812                              "MODALIAS=");
 813         if (*cur_len >= buffer_size)
 814                 return -ENOMEM;
 815
 816         *cur_len += input_print_modalias(buffer + *cur_len,
 817                                          max(buffer_size - *cur_len, 0),
 818                                          dev, 0) + 1;
 819         if (*cur_len > buffer_size)
 820                 return -ENOMEM;
 821
 822         (*cur_index)++;
 823         return 0;
 824 }
 825
 826 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
 827         do {                                                            \
 828                 int err = add_uevent_var(envp, num_envp, &i,            \
 829                                         buffer, buffer_size, &len,      \
 830                                         fmt, val);                      \
 831                 if (err)                                                \
 832                         return err;                                     \
 833         } while (0)
 834
 835 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
 836         do {                                                            \
 837                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
 838                                         buffer, buffer_size, &len,      \
 839                                         name, bm, max);                 \
 840                 if (err)                                                \
 841                         return err;                                     \
 842         } while (0)
 843
 844 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
 845         do {                                                            \
 846                 int err = input_add_uevent_modalias_var(envp,           \
 847                                         num_envp, &i,                   \
 848                                         buffer, buffer_size, &len,      \
 849                                         dev);                           \
 850                 if (err)                                                \
 851                         return err;                                     \
 852         } while (0)
 853
 854 static int input_dev_uevent(struct class_device *cdev, char **envp,
 855                             int num_envp, char *buffer, int buffer_size)
 856 {
 857         struct input_dev *dev = to_input_dev(cdev);
 858         int i = 0;
 859         int len = 0;
 860
 861         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
 862                                 dev->id.bustype, dev->id.vendor,
 863                                 dev->id.product, dev->id.version);
 864         if (dev->name)
 865                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
 866         if (dev->phys)
 867                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
 868         if (dev->uniq)
 869                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
 870
 871         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
 872         if (test_bit(EV_KEY, dev->evbit))
 873                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
 874         if (test_bit(EV_REL, dev->evbit))
 875                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
 876         if (test_bit(EV_ABS, dev->evbit))
 877                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
 878         if (test_bit(EV_MSC, dev->evbit))
 879                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
 880         if (test_bit(EV_LED, dev->evbit))
 881                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
 882         if (test_bit(EV_SND, dev->evbit))
 883                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
 884         if (test_bit(EV_FF, dev->evbit))
 885                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
 886         if (test_bit(EV_SW, dev->evbit))
 887                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
 888
 889         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
 890
 891         envp[i] = NULL;
 892         return 0;
 893 }
 894
 895 struct class input_class = {
 896         .name                   = "input",
 897         .release                = input_dev_release,
 898         .uevent                 = input_dev_uevent,
 899 };
 900 EXPORT_SYMBOL_GPL(input_class);
 901
 902 struct input_dev *input_allocate_device(void)
 903 {
 904         struct input_dev *dev;
 905
 906         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
 907         if (dev) {
 908                 dev->dynalloc = 1;
 909                 dev->cdev.class = &input_class;
 910                 class_device_initialize(&dev->cdev);
 911                 mutex_init(&dev->mutex);
 912                 INIT_LIST_HEAD(&dev->h_list);
 913                 INIT_LIST_HEAD(&dev->node);
 914         }
 915
 916         return dev;
 917 }
 918 EXPORT_SYMBOL(input_allocate_device);
 919
 920 void input_free_device(struct input_dev *dev)
 921 {
 922         if (dev) {
 923
 924                 mutex_lock(&dev->mutex);
 925                 dev->name = dev->phys = dev->uniq = NULL;
 926                 mutex_unlock(&dev->mutex);
 927
 928                 input_put_device(dev);
 929         }
 930 }
 931 EXPORT_SYMBOL(input_free_device);
 932
 933 int input_register_device(struct input_dev *dev)
 934 {
 935         static atomic_t input_no = ATOMIC_INIT(0);
 936         struct input_handle *handle;
 937         struct input_handler *handler;
 938         struct input_device_id *id;
 939         const char *path;
 940         int error;
 941
 942         if (!dev->dynalloc) {
 943                 printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
 944                         "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n",
 945                         dev->name ? dev->name : "<Unknown>");
 946                 return -EINVAL;
 947         }
 948
 949         set_bit(EV_SYN, dev->evbit);
 950
 951         /*
 952          * If delay and period are pre-set by the driver, then autorepeating
 953          * is handled by the driver itself and we don't do it in input.c.
 954          */
 955
 956         init_timer(&dev->timer);
 957         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
 958                 dev->timer.data = (long) dev;
 959                 dev->timer.function = input_repeat_key;
 960                 dev->rep[REP_DELAY] = 250;
 961                 dev->rep[REP_PERIOD] = 33;
 962         }
 963
 964         INIT_LIST_HEAD(&dev->h_list);
 965         list_add_tail(&dev->node, &input_dev_list);
 966
 967         dev->cdev.class = &input_class;
 968         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
 969                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
 970
 971         error = class_device_add(&dev->cdev);
 972         if (error)
 973                 return error;
 974
 975         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
 976         if (error)
 977                 goto fail1;
 978
 979         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 980         if (error)
 981                 goto fail2;
 982
 983         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
 984         if (error)
 985                 goto fail3;
 986
 987         __module_get(THIS_MODULE);
 988
 989         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 990         printk(KERN_INFO "input: %s as %s\n",
 991                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
 992         kfree(path);
 993
 994         list_for_each_entry(handler, &input_handler_list, node)
 995                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 996                         if ((id = input_match_device(handler->id_table, dev)))
 997                                 if ((handle = handler->connect(handler, dev, id))) {
 998                                         input_link_handle(handle);
 999                                         if (handler->start)
1000                                                 handler->start(handle);
1001                                 }
1002
1003         input_wakeup_procfs_readers();
1004
1005         return 0;
1006
1007  fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1008  fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1009  fail1: class_device_del(&dev->cdev);
1010         return error;
1011 }
1012 EXPORT_SYMBOL(input_register_device);
1013
1014 void input_unregister_device(struct input_dev *dev)
1015 {
1016         struct list_head *node, *next;
1017
1018         if (!dev)
1019                 return;
1020
1021         del_timer_sync(&dev->timer);
1022
1023         list_for_each_safe(node, next, &dev->h_list) {
1024                 struct input_handle * handle = to_handle(node);
1025                 list_del_init(&handle->d_node);
1026                 list_del_init(&handle->h_node);
1027                 handle->handler->disconnect(handle);
1028         }
1029
1030         list_del_init(&dev->node);
1031
1032         sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
1033         sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1034         sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1035
1036         mutex_lock(&dev->mutex);
1037         dev->name = dev->phys = dev->uniq = NULL;
1038         mutex_unlock(&dev->mutex);
1039
1040         class_device_unregister(&dev->cdev);
1041
1042         input_wakeup_procfs_readers();
1043 }
1044 EXPORT_SYMBOL(input_unregister_device);
1045
1046 void input_register_handler(struct input_handler *handler)
1047 {
1048         struct input_dev *dev;
1049         struct input_handle *handle;
1050         struct input_device_id *id;
1051
1052         if (!handler)
1053                 return;
1054
1055         INIT_LIST_HEAD(&handler->h_list);
1056
1057         if (handler->fops != NULL)
1058                 input_table[handler->minor >> 5] = handler;
1059
1060         list_add_tail(&handler->node, &input_handler_list);
1061
1062         list_for_each_entry(dev, &input_dev_list, node)
1063                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1064                         if ((id = input_match_device(handler->id_table, dev)))
1065                                 if ((handle = handler->connect(handler, dev, id))) {
1066                                         input_link_handle(handle);
1067                                         if (handler->start)
1068                                                 handler->start(handle);
1069                                 }
1070
1071         input_wakeup_procfs_readers();
1072 }
1073 EXPORT_SYMBOL(input_register_handler);
1074
1075 void input_unregister_handler(struct input_handler *handler)
1076 {
1077         struct list_head *node, *next;
1078
1079         list_for_each_safe(node, next, &handler->h_list) {
1080                 struct input_handle * handle = to_handle_h(node);
1081                 list_del_init(&handle->h_node);
1082                 list_del_init(&handle->d_node);
1083                 handler->disconnect(handle);
1084         }
1085
1086         list_del_init(&handler->node);
1087
1088         if (handler->fops != NULL)
1089                 input_table[handler->minor >> 5] = NULL;
1090
1091         input_wakeup_procfs_readers();
1092 }
1093 EXPORT_SYMBOL(input_unregister_handler);
1094
1095 static int input_open_file(struct inode *inode, struct file *file)
1096 {
1097         struct input_handler *handler = input_table[iminor(inode) >> 5];
1098         const struct file_operations *old_fops, *new_fops = NULL;
1099         int err;
1100
1101         /* No load-on-demand here? */
1102         if (!handler || !(new_fops = fops_get(handler->fops)))
1103                 return -ENODEV;
1104
1105         /*
1106          * That's _really_ odd. Usually NULL ->open means "nothing special",
1107          * not "no device". Oh, well...
1108          */
1109         if (!new_fops->open) {
1110                 fops_put(new_fops);
1111                 return -ENODEV;
1112         }
1113         old_fops = file->f_op;
1114         file->f_op = new_fops;
1115
1116         err = new_fops->open(inode, file);
1117
1118         if (err) {
1119                 fops_put(file->f_op);
1120                 file->f_op = fops_get(old_fops);
1121         }
1122         fops_put(old_fops);
1123         return err;
1124 }
1125
1126 static struct file_operations input_fops = {
1127         .owner = THIS_MODULE,
1128         .open = input_open_file,
1129 };
1130
1131 static int __init input_init(void)
1132 {
1133         int err;
1134
1135         err = class_register(&input_class);
1136         if (err) {
1137                 printk(KERN_ERR "input: unable to register input_dev class\n");
1138                 return err;
1139         }
1140
1141         err = input_proc_init();
1142         if (err)
1143                 goto fail1;
1144
1145         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1146         if (err) {
1147                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1148                 goto fail2;
1149         }
1150
1151         return 0;
1152
1153  fail2: input_proc_exit();
1154  fail1: class_unregister(&input_class);
1155         return err;
1156 }
1157
1158 static void __exit input_exit(void)
1159 {
1160         input_proc_exit();
1161         unregister_chrdev(INPUT_MAJOR, "input");
1162         class_unregister(&input_class);
1163 }
1164
1165 subsys_initcall(input_init);
1166 module_exit(input_exit);