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