SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         if (handle->dev->grab == handle) {
 240                 handle->dev->grab = NULL;
 241
 242                 list_for_each_entry(handle, &handle->dev->h_list, d_node)
 243                         if (handle->handler->start)
 244                                 handle->handler->start(handle);
 245         }
 246 }
 247 EXPORT_SYMBOL(input_release_device);
 248
 249 int input_open_device(struct input_handle *handle)
 250 {
 251         struct input_dev *dev = handle->dev;
 252         int err;
 253
 254         err = mutex_lock_interruptible(&dev->mutex);
 255         if (err)
 256                 return err;
 257
 258         handle->open++;
 259
 260         if (!dev->users++ && dev->open)
 261                 err = dev->open(dev);
 262
 263         if (err)
 264                 handle->open--;
 265
 266         mutex_unlock(&dev->mutex);
 267
 268         return err;
 269 }
 270 EXPORT_SYMBOL(input_open_device);
 271
 272 int input_flush_device(struct input_handle* handle, struct file* file)
 273 {
 274         if (handle->dev->flush)
 275                 return handle->dev->flush(handle->dev, file);
 276
 277         return 0;
 278 }
 279 EXPORT_SYMBOL(input_flush_device);
 280
 281 void input_close_device(struct input_handle *handle)
 282 {
 283         struct input_dev *dev = handle->dev;
 284
 285         input_release_device(handle);
 286
 287         mutex_lock(&dev->mutex);
 288
 289         if (!--dev->users && dev->close)
 290                 dev->close(dev);
 291         handle->open--;
 292
 293         mutex_unlock(&dev->mutex);
 294 }
 295 EXPORT_SYMBOL(input_close_device);
 296
 297 static void input_link_handle(struct input_handle *handle)
 298 {
 299         list_add_tail(&handle->d_node, &handle->dev->h_list);
 300         list_add_tail(&handle->h_node, &handle->handler->h_list);
 301 }
 302
 303 #define MATCH_BIT(bit, max) \
 304                 for (i = 0; i < NBITS(max); i++) \
 305                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
 306                                 break; \
 307                 if (i != NBITS(max)) \
 308                         continue;
 309
 310 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
 311 {
 312         int i;
 313
 314         for (; id->flags || id->driver_info; id++) {
 315
 316                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 317                         if (id->bustype != dev->id.bustype)
 318                                 continue;
 319
 320                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 321                         if (id->vendor != dev->id.vendor)
 322                                 continue;
 323
 324                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 325                         if (id->product != dev->id.product)
 326                                 continue;
 327
 328                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 329                         if (id->version != dev->id.version)
 330                                 continue;
 331
 332                 MATCH_BIT(evbit,  EV_MAX);
 333                 MATCH_BIT(keybit, KEY_MAX);
 334                 MATCH_BIT(relbit, REL_MAX);
 335                 MATCH_BIT(absbit, ABS_MAX);
 336                 MATCH_BIT(mscbit, MSC_MAX);
 337                 MATCH_BIT(ledbit, LED_MAX);
 338                 MATCH_BIT(sndbit, SND_MAX);
 339                 MATCH_BIT(ffbit,  FF_MAX);
 340                 MATCH_BIT(swbit,  SW_MAX);
 341
 342                 return id;
 343         }
 344
 345         return NULL;
 346 }
 347
 348 #ifdef CONFIG_PROC_FS
 349
 350 static struct proc_dir_entry *proc_bus_input_dir;
 351 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
 352 static int input_devices_state;
 353
 354 static inline void input_wakeup_procfs_readers(void)
 355 {
 356         input_devices_state++;
 357         wake_up(&input_devices_poll_wait);
 358 }
 359
 360 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
 361 {
 362         int state = input_devices_state;
 363
 364         poll_wait(file, &input_devices_poll_wait, wait);
 365         if (state != input_devices_state)
 366                 return POLLIN | POLLRDNORM;
 367
 368         return 0;
 369 }
 370
 371 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
 372 {
 373         struct list_head *node;
 374         loff_t i = 0;
 375
 376         list_for_each(node, list)
 377                 if (i++ == *pos)
 378                         return node;
 379
 380         return NULL;
 381 }
 382
 383 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
 384 {
 385         if (element->next == list)
 386                 return NULL;
 387
 388         ++(*pos);
 389         return element->next;
 390 }
 391
 392 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
 393 {
 394         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 395
 396         return list_get_nth_element(&input_dev_list, pos);
 397 }
 398
 399 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 400 {
 401         return list_get_next_element(&input_dev_list, v, pos);
 402 }
 403
 404 static void input_devices_seq_stop(struct seq_file *seq, void *v)
 405 {
 406         /* release lock here */
 407 }
 408
 409 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
 410                                    unsigned long *bitmap, int max)
 411 {
 412         int i;
 413
 414         for (i = NBITS(max) - 1; i > 0; i--)
 415                 if (bitmap[i])
 416                         break;
 417
 418         seq_printf(seq, "B: %s=", name);
 419         for (; i >= 0; i--)
 420                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
 421         seq_putc(seq, '\n');
 422 }
 423
 424 static int input_devices_seq_show(struct seq_file *seq, void *v)
 425 {
 426         struct input_dev *dev = container_of(v, struct input_dev, node);
 427         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 428         struct input_handle *handle;
 429
 430         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 431                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 432
 433         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 434         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 435         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
 436         seq_printf(seq, "H: Handlers=");
 437
 438         list_for_each_entry(handle, &dev->h_list, d_node)
 439                 seq_printf(seq, "%s ", handle->name);
 440         seq_putc(seq, '\n');
 441
 442         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
 443         if (test_bit(EV_KEY, dev->evbit))
 444                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
 445         if (test_bit(EV_REL, dev->evbit))
 446                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
 447         if (test_bit(EV_ABS, dev->evbit))
 448                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
 449         if (test_bit(EV_MSC, dev->evbit))
 450                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
 451         if (test_bit(EV_LED, dev->evbit))
 452                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
 453         if (test_bit(EV_SND, dev->evbit))
 454                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
 455         if (test_bit(EV_FF, dev->evbit))
 456                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
 457         if (test_bit(EV_SW, dev->evbit))
 458                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
 459
 460         seq_putc(seq, '\n');
 461
 462         kfree(path);
 463         return 0;
 464 }
 465
 466 static struct seq_operations input_devices_seq_ops = {
 467         .start  = input_devices_seq_start,
 468         .next   = input_devices_seq_next,
 469         .stop   = input_devices_seq_stop,
 470         .show   = input_devices_seq_show,
 471 };
 472
 473 static int input_proc_devices_open(struct inode *inode, struct file *file)
 474 {
 475         return seq_open(file, &input_devices_seq_ops);
 476 }
 477
 478 static struct file_operations input_devices_fileops = {
 479         .owner          = THIS_MODULE,
 480         .open           = input_proc_devices_open,
 481         .poll           = input_proc_devices_poll,
 482         .read           = seq_read,
 483         .llseek         = seq_lseek,
 484         .release        = seq_release,
 485 };
 486
 487 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
 488 {
 489         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 490         seq->private = (void *)(unsigned long)*pos;
 491         return list_get_nth_element(&input_handler_list, pos);
 492 }
 493
 494 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 495 {
 496         seq->private = (void *)(unsigned long)(*pos + 1);
 497         return list_get_next_element(&input_handler_list, v, pos);
 498 }
 499
 500 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
 501 {
 502         /* release lock here */
 503 }
 504
 505 static int input_handlers_seq_show(struct seq_file *seq, void *v)
 506 {
 507         struct input_handler *handler = container_of(v, struct input_handler, node);
 508
 509         seq_printf(seq, "N: Number=%ld Name=%s",
 510                    (unsigned long)seq->private, handler->name);
 511         if (handler->fops)
 512                 seq_printf(seq, " Minor=%d", handler->minor);
 513         seq_putc(seq, '\n');
 514
 515         return 0;
 516 }
 517 static struct seq_operations input_handlers_seq_ops = {
 518         .start  = input_handlers_seq_start,
 519         .next   = input_handlers_seq_next,
 520         .stop   = input_handlers_seq_stop,
 521         .show   = input_handlers_seq_show,
 522 };
 523
 524 static int input_proc_handlers_open(struct inode *inode, struct file *file)
 525 {
 526         return seq_open(file, &input_handlers_seq_ops);
 527 }
 528
 529 static struct file_operations input_handlers_fileops = {
 530         .owner          = THIS_MODULE,
 531         .open           = input_proc_handlers_open,
 532         .read           = seq_read,
 533         .llseek         = seq_lseek,
 534         .release        = seq_release,
 535 };
 536
 537 static int __init input_proc_init(void)
 538 {
 539         struct proc_dir_entry *entry;
 540
 541         proc_bus_input_dir = proc_mkdir("input", proc_bus);
 542         if (!proc_bus_input_dir)
 543                 return -ENOMEM;
 544
 545         proc_bus_input_dir->owner = THIS_MODULE;
 546
 547         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
 548         if (!entry)
 549                 goto fail1;
 550
 551         entry->owner = THIS_MODULE;
 552         entry->proc_fops = &input_devices_fileops;
 553
 554         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
 555         if (!entry)
 556                 goto fail2;
 557
 558         entry->owner = THIS_MODULE;
 559         entry->proc_fops = &input_handlers_fileops;
 560
 561         return 0;
 562
 563  fail2: remove_proc_entry("devices", proc_bus_input_dir);
 564  fail1: remove_proc_entry("input", proc_bus);
 565         return -ENOMEM;
 566 }
 567
 568 static void input_proc_exit(void)
 569 {
 570         remove_proc_entry("devices", proc_bus_input_dir);
 571         remove_proc_entry("handlers", proc_bus_input_dir);
 572         remove_proc_entry("input", proc_bus);
 573 }
 574
 575 #else /* !CONFIG_PROC_FS */
 576 static inline void input_wakeup_procfs_readers(void) { }
 577 static inline int input_proc_init(void) { return 0; }
 578 static inline void input_proc_exit(void) { }
 579 #endif
 580
 581 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
 582 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
 583 {                                                                               \
 584         struct input_dev *input_dev = to_input_dev(dev);                        \
 585         int retval;                                                             \
 586                                                                                 \
 587         retval = mutex_lock_interruptible(&input_dev->mutex);                   \
 588         if (retval)                                                             \
 589                 return retval;                                                  \
 590                                                                                 \
 591         retval = scnprintf(buf, PAGE_SIZE,                                      \
 592                            "%s\n", input_dev->name ? input_dev->name : "");     \
 593                                                                                 \
 594         mutex_unlock(&input_dev->mutex);                                        \
 595                                                                                 \
 596         return retval;                                                          \
 597 }                                                                               \
 598 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
 599
 600 INPUT_DEV_STRING_ATTR_SHOW(name);
 601 INPUT_DEV_STRING_ATTR_SHOW(phys);
 602 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 603
 604 static int input_print_modalias_bits(char *buf, int size,
 605                                      char name, unsigned long *bm,
 606                                      unsigned int min_bit, unsigned int max_bit)
 607 {
 608         int len = 0, i;
 609
 610         len += snprintf(buf, max(size, 0), "%c", name);
 611         for (i = min_bit; i < max_bit; i++)
 612                 if (bm[LONG(i)] & BIT(i))
 613                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
 614         return len;
 615 }
 616
 617 static int input_print_modalias(char *buf, int size, struct input_dev *id,
 618                                 int add_cr)
 619 {
 620         int len;
 621
 622         len = snprintf(buf, max(size, 0),
 623                        "input:b%04Xv%04Xp%04Xe%04X-",
 624                        id->id.bustype, id->id.vendor,
 625                        id->id.product, id->id.version);
 626
 627         len += input_print_modalias_bits(buf + len, size - len,
 628                                 'e', id->evbit, 0, EV_MAX);
 629         len += input_print_modalias_bits(buf + len, size - len,
 630                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
 631         len += input_print_modalias_bits(buf + len, size - len,
 632                                 'r', id->relbit, 0, REL_MAX);
 633         len += input_print_modalias_bits(buf + len, size - len,
 634                                 'a', id->absbit, 0, ABS_MAX);
 635         len += input_print_modalias_bits(buf + len, size - len,
 636                                 'm', id->mscbit, 0, MSC_MAX);
 637         len += input_print_modalias_bits(buf + len, size - len,
 638                                 'l', id->ledbit, 0, LED_MAX);
 639         len += input_print_modalias_bits(buf + len, size - len,
 640                                 's', id->sndbit, 0, SND_MAX);
 641         len += input_print_modalias_bits(buf + len, size - len,
 642                                 'f', id->ffbit, 0, FF_MAX);
 643         len += input_print_modalias_bits(buf + len, size - len,
 644                                 'w', id->swbit, 0, SW_MAX);
 645
 646         if (add_cr)
 647                 len += snprintf(buf + len, max(size - len, 0), "\n");
 648
 649         return len;
 650 }
 651
 652 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
 653 {
 654         struct input_dev *id = to_input_dev(dev);
 655         ssize_t len;
 656
 657         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
 658
 659         return min_t(int, len, PAGE_SIZE);
 660 }
 661 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 662
 663 static struct attribute *input_dev_attrs[] = {
 664         &class_device_attr_name.attr,
 665         &class_device_attr_phys.attr,
 666         &class_device_attr_uniq.attr,
 667         &class_device_attr_modalias.attr,
 668         NULL
 669 };
 670
 671 static struct attribute_group input_dev_attr_group = {
 672         .attrs  = input_dev_attrs,
 673 };
 674
 675 #define INPUT_DEV_ID_ATTR(name)                                                 \
 676 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
 677 {                                                                               \
 678         struct input_dev *input_dev = to_input_dev(dev);                        \
 679         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
 680 }                                                                               \
 681 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
 682
 683 INPUT_DEV_ID_ATTR(bustype);
 684 INPUT_DEV_ID_ATTR(vendor);
 685 INPUT_DEV_ID_ATTR(product);
 686 INPUT_DEV_ID_ATTR(version);
 687
 688 static struct attribute *input_dev_id_attrs[] = {
 689         &class_device_attr_bustype.attr,
 690         &class_device_attr_vendor.attr,
 691         &class_device_attr_product.attr,
 692         &class_device_attr_version.attr,
 693         NULL
 694 };
 695
 696 static struct attribute_group input_dev_id_attr_group = {
 697         .name   = "id",
 698         .attrs  = input_dev_id_attrs,
 699 };
 700
 701 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
 702                               int max, int add_cr)
 703 {
 704         int i;
 705         int len = 0;
 706
 707         for (i = NBITS(max) - 1; i > 0; i--)
 708                 if (bitmap[i])
 709                         break;
 710
 711         for (; i >= 0; i--)
 712                 len += snprintf(buf + len, max(buf_size - len, 0),
 713                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
 714
 715         if (add_cr)
 716                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
 717
 718         return len;
 719 }
 720
 721 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
 722 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
 723 {                                                                               \
 724         struct input_dev *input_dev = to_input_dev(dev);                        \
 725         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
 726                                      input_dev->bm##bit, ev##_MAX, 1);          \
 727         return min_t(int, len, PAGE_SIZE);                                      \
 728 }                                                                               \
 729 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
 730
 731 INPUT_DEV_CAP_ATTR(EV, ev);
 732 INPUT_DEV_CAP_ATTR(KEY, key);
 733 INPUT_DEV_CAP_ATTR(REL, rel);
 734 INPUT_DEV_CAP_ATTR(ABS, abs);
 735 INPUT_DEV_CAP_ATTR(MSC, msc);
 736 INPUT_DEV_CAP_ATTR(LED, led);
 737 INPUT_DEV_CAP_ATTR(SND, snd);
 738 INPUT_DEV_CAP_ATTR(FF, ff);
 739 INPUT_DEV_CAP_ATTR(SW, sw);
 740
 741 static struct attribute *input_dev_caps_attrs[] = {
 742         &class_device_attr_ev.attr,
 743         &class_device_attr_key.attr,
 744         &class_device_attr_rel.attr,
 745         &class_device_attr_abs.attr,
 746         &class_device_attr_msc.attr,
 747         &class_device_attr_led.attr,
 748         &class_device_attr_snd.attr,
 749         &class_device_attr_ff.attr,
 750         &class_device_attr_sw.attr,
 751         NULL
 752 };
 753
 754 static struct attribute_group input_dev_caps_attr_group = {
 755         .name   = "capabilities",
 756         .attrs  = input_dev_caps_attrs,
 757 };
 758
 759 static void input_dev_release(struct class_device *class_dev)
 760 {
 761         struct input_dev *dev = to_input_dev(class_dev);
 762
 763         kfree(dev);
 764         module_put(THIS_MODULE);
 765 }
 766
 767 /*
 768  * Input uevent interface - loading event handlers based on
 769  * device bitfields.
 770  */
 771 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
 772                                    char *buffer, int buffer_size, int *cur_len,
 773                                    const char *name, unsigned long *bitmap, int max)
 774 {
 775         if (*cur_index >= num_envp - 1)
 776                 return -ENOMEM;
 777
 778         envp[*cur_index] = buffer + *cur_len;
 779
 780         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
 781         if (*cur_len >= buffer_size)
 782                 return -ENOMEM;
 783
 784         *cur_len += input_print_bitmap(buffer + *cur_len,
 785                                         max(buffer_size - *cur_len, 0),
 786                                         bitmap, max, 0) + 1;
 787         if (*cur_len > buffer_size)
 788                 return -ENOMEM;
 789
 790         (*cur_index)++;
 791         return 0;
 792 }
 793
 794 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
 795                                          char *buffer, int buffer_size, int *cur_len,
 796                                          struct input_dev *dev)
 797 {
 798         if (*cur_index >= num_envp - 1)
 799                 return -ENOMEM;
 800
 801         envp[*cur_index] = buffer + *cur_len;
 802
 803         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
 804                              "MODALIAS=");
 805         if (*cur_len >= buffer_size)
 806                 return -ENOMEM;
 807
 808         *cur_len += input_print_modalias(buffer + *cur_len,
 809                                          max(buffer_size - *cur_len, 0),
 810                                          dev, 0) + 1;
 811         if (*cur_len > buffer_size)
 812                 return -ENOMEM;
 813
 814         (*cur_index)++;
 815         return 0;
 816 }
 817
 818 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
 819         do {                                                            \
 820                 int err = add_uevent_var(envp, num_envp, &i,            \
 821                                         buffer, buffer_size, &len,      \
 822                                         fmt, val);                      \
 823                 if (err)                                                \
 824                         return err;                                     \
 825         } while (0)
 826
 827 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
 828         do {                                                            \
 829                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
 830                                         buffer, buffer_size, &len,      \
 831                                         name, bm, max);                 \
 832                 if (err)                                                \
 833                         return err;                                     \
 834         } while (0)
 835
 836 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
 837         do {                                                            \
 838                 int err = input_add_uevent_modalias_var(envp,           \
 839                                         num_envp, &i,                   \
 840                                         buffer, buffer_size, &len,      \
 841                                         dev);                           \
 842                 if (err)                                                \
 843                         return err;                                     \
 844         } while (0)
 845
 846 static int input_dev_uevent(struct class_device *cdev, char **envp,
 847                             int num_envp, char *buffer, int buffer_size)
 848 {
 849         struct input_dev *dev = to_input_dev(cdev);
 850         int i = 0;
 851         int len = 0;
 852
 853         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
 854                                 dev->id.bustype, dev->id.vendor,
 855                                 dev->id.product, dev->id.version);
 856         if (dev->name)
 857                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
 858         if (dev->phys)
 859                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
 860         if (dev->uniq)
 861                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
 862
 863         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
 864         if (test_bit(EV_KEY, dev->evbit))
 865                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
 866         if (test_bit(EV_REL, dev->evbit))
 867                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
 868         if (test_bit(EV_ABS, dev->evbit))
 869                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
 870         if (test_bit(EV_MSC, dev->evbit))
 871                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
 872         if (test_bit(EV_LED, dev->evbit))
 873                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
 874         if (test_bit(EV_SND, dev->evbit))
 875                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
 876         if (test_bit(EV_FF, dev->evbit))
 877                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
 878         if (test_bit(EV_SW, dev->evbit))
 879                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
 880
 881         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
 882
 883         envp[i] = NULL;
 884         return 0;
 885 }
 886
 887 struct class input_class = {
 888         .name                   = "input",
 889         .release                = input_dev_release,
 890         .uevent                 = input_dev_uevent,
 891 };
 892 EXPORT_SYMBOL_GPL(input_class);
 893
 894 struct input_dev *input_allocate_device(void)
 895 {
 896         struct input_dev *dev;
 897
 898         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
 899         if (dev) {
 900                 dev->dynalloc = 1;
 901                 dev->cdev.class = &input_class;
 902                 class_device_initialize(&dev->cdev);
 903                 mutex_init(&dev->mutex);
 904                 INIT_LIST_HEAD(&dev->h_list);
 905                 INIT_LIST_HEAD(&dev->node);
 906         }
 907
 908         return dev;
 909 }
 910 EXPORT_SYMBOL(input_allocate_device);
 911
 912 void input_free_device(struct input_dev *dev)
 913 {
 914         if (dev) {
 915
 916                 mutex_lock(&dev->mutex);
 917                 dev->name = dev->phys = dev->uniq = NULL;
 918                 mutex_unlock(&dev->mutex);
 919
 920                 input_put_device(dev);
 921         }
 922 }
 923 EXPORT_SYMBOL(input_free_device);
 924
 925 int input_register_device(struct input_dev *dev)
 926 {
 927         static atomic_t input_no = ATOMIC_INIT(0);
 928         struct input_handle *handle;
 929         struct input_handler *handler;
 930         struct input_device_id *id;
 931         const char *path;
 932         int error;
 933
 934         if (!dev->dynalloc) {
 935                 printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
 936                         "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n",
 937                         dev->name ? dev->name : "<Unknown>");
 938                 return -EINVAL;
 939         }
 940
 941         set_bit(EV_SYN, dev->evbit);
 942
 943         /*
 944          * If delay and period are pre-set by the driver, then autorepeating
 945          * is handled by the driver itself and we don't do it in input.c.
 946          */
 947
 948         init_timer(&dev->timer);
 949         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
 950                 dev->timer.data = (long) dev;
 951                 dev->timer.function = input_repeat_key;
 952                 dev->rep[REP_DELAY] = 250;
 953                 dev->rep[REP_PERIOD] = 33;
 954         }
 955
 956         INIT_LIST_HEAD(&dev->h_list);
 957         list_add_tail(&dev->node, &input_dev_list);
 958
 959         dev->cdev.class = &input_class;
 960         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
 961                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
 962
 963         error = class_device_add(&dev->cdev);
 964         if (error)
 965                 return error;
 966
 967         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
 968         if (error)
 969                 goto fail1;
 970
 971         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 972         if (error)
 973                 goto fail2;
 974
 975         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
 976         if (error)
 977                 goto fail3;
 978
 979         __module_get(THIS_MODULE);
 980
 981         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 982         printk(KERN_INFO "input: %s as %s\n",
 983                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
 984         kfree(path);
 985
 986         list_for_each_entry(handler, &input_handler_list, node)
 987                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 988                         if ((id = input_match_device(handler->id_table, dev)))
 989                                 if ((handle = handler->connect(handler, dev, id))) {
 990                                         input_link_handle(handle);
 991                                         if (handler->start)
 992                                                 handler->start(handle);
 993                                 }
 994
 995         input_wakeup_procfs_readers();
 996
 997         return 0;
 998
 999  fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1000  fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1001  fail1: class_device_del(&dev->cdev);
1002         return error;
1003 }
1004 EXPORT_SYMBOL(input_register_device);
1005
1006 void input_unregister_device(struct input_dev *dev)
1007 {
1008         struct list_head *node, *next;
1009
1010         if (!dev)
1011                 return;
1012
1013         del_timer_sync(&dev->timer);
1014
1015         list_for_each_safe(node, next, &dev->h_list) {
1016                 struct input_handle * handle = to_handle(node);
1017                 list_del_init(&handle->d_node);
1018                 list_del_init(&handle->h_node);
1019                 handle->handler->disconnect(handle);
1020         }
1021
1022         list_del_init(&dev->node);
1023
1024         sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
1025         sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1026         sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1027
1028         mutex_lock(&dev->mutex);
1029         dev->name = dev->phys = dev->uniq = NULL;
1030         mutex_unlock(&dev->mutex);
1031
1032         class_device_unregister(&dev->cdev);
1033
1034         input_wakeup_procfs_readers();
1035 }
1036 EXPORT_SYMBOL(input_unregister_device);
1037
1038 void input_register_handler(struct input_handler *handler)
1039 {
1040         struct input_dev *dev;
1041         struct input_handle *handle;
1042         struct input_device_id *id;
1043
1044         if (!handler)
1045                 return;
1046
1047         INIT_LIST_HEAD(&handler->h_list);
1048
1049         if (handler->fops != NULL)
1050                 input_table[handler->minor >> 5] = handler;
1051
1052         list_add_tail(&handler->node, &input_handler_list);
1053
1054         list_for_each_entry(dev, &input_dev_list, node)
1055                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1056                         if ((id = input_match_device(handler->id_table, dev)))
1057                                 if ((handle = handler->connect(handler, dev, id)))
1058                                         input_link_handle(handle);
1059
1060         input_wakeup_procfs_readers();
1061 }
1062 EXPORT_SYMBOL(input_register_handler);
1063
1064 void input_unregister_handler(struct input_handler *handler)
1065 {
1066         struct list_head *node, *next;
1067
1068         list_for_each_safe(node, next, &handler->h_list) {
1069                 struct input_handle * handle = to_handle_h(node);
1070                 list_del_init(&handle->h_node);
1071                 list_del_init(&handle->d_node);
1072                 handler->disconnect(handle);
1073         }
1074
1075         list_del_init(&handler->node);
1076
1077         if (handler->fops != NULL)
1078                 input_table[handler->minor >> 5] = NULL;
1079
1080         input_wakeup_procfs_readers();
1081 }
1082 EXPORT_SYMBOL(input_unregister_handler);
1083
1084 static int input_open_file(struct inode *inode, struct file *file)
1085 {
1086         struct input_handler *handler = input_table[iminor(inode) >> 5];
1087         const struct file_operations *old_fops, *new_fops = NULL;
1088         int err;
1089
1090         /* No load-on-demand here? */
1091         if (!handler || !(new_fops = fops_get(handler->fops)))
1092                 return -ENODEV;
1093
1094         /*
1095          * That's _really_ odd. Usually NULL ->open means "nothing special",
1096          * not "no device". Oh, well...
1097          */
1098         if (!new_fops->open) {
1099                 fops_put(new_fops);
1100                 return -ENODEV;
1101         }
1102         old_fops = file->f_op;
1103         file->f_op = new_fops;
1104
1105         err = new_fops->open(inode, file);
1106
1107         if (err) {
1108                 fops_put(file->f_op);
1109                 file->f_op = fops_get(old_fops);
1110         }
1111         fops_put(old_fops);
1112         return err;
1113 }
1114
1115 static struct file_operations input_fops = {
1116         .owner = THIS_MODULE,
1117         .open = input_open_file,
1118 };
1119
1120 static int __init input_init(void)
1121 {
1122         int err;
1123
1124         err = class_register(&input_class);
1125         if (err) {
1126                 printk(KERN_ERR "input: unable to register input_dev class\n");
1127                 return err;
1128         }
1129
1130         err = input_proc_init();
1131         if (err)
1132                 goto fail1;
1133
1134         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1135         if (err) {
1136                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1137                 goto fail2;
1138         }
1139
1140         return 0;
1141
1142  fail2: input_proc_exit();
1143  fail1: class_unregister(&input_class);
1144         return err;
1145 }
1146
1147 static void __exit input_exit(void)
1148 {
1149         input_proc_exit();
1150         unregister_chrdev(INPUT_MAJOR, "input");
1151         class_unregister(&input_class);
1152 }
1153
1154 subsys_initcall(input_init);
1155 module_exit(input_exit);