drivers/input/input.c

   1 /*
   2  * The input core
   3  *
   4  * Copyright (c) 1999-2002 Vojtech Pavlik
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published by
  10  * the Free Software Foundation.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/sched.h>
  15 #include <linux/smp_lock.h>
  16 #include <linux/input.h>
  17 #include <linux/module.h>
  18 #include <linux/random.h>
  19 #include <linux/major.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/poll.h>
  24 #include <linux/device.h>
  25 #include <linux/mutex.h>
  26
  27 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  28 MODULE_DESCRIPTION("Input core");
  29 MODULE_LICENSE("GPL");
  30
  31 EXPORT_SYMBOL(input_allocate_device);
  32 EXPORT_SYMBOL(input_register_device);
  33 EXPORT_SYMBOL(input_unregister_device);
  34 EXPORT_SYMBOL(input_register_handler);
  35 EXPORT_SYMBOL(input_unregister_handler);
  36 EXPORT_SYMBOL(input_grab_device);
  37 EXPORT_SYMBOL(input_release_device);
  38 EXPORT_SYMBOL(input_open_device);
  39 EXPORT_SYMBOL(input_close_device);
  40 EXPORT_SYMBOL(input_accept_process);
  41 EXPORT_SYMBOL(input_flush_device);
  42 EXPORT_SYMBOL(input_event);
  43 EXPORT_SYMBOL_GPL(input_class);
  44
  45 #define INPUT_DEVICES   256
  46
  47 static LIST_HEAD(input_dev_list);
  48 static LIST_HEAD(input_handler_list);
  49
  50 static struct input_handler *input_table[8];
  51
  52 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  53 {
  54         struct input_handle *handle;
  55
  56         if (type > EV_MAX || !test_bit(type, dev->evbit))
  57                 return;
  58
  59         add_input_randomness(type, code, value);
  60
  61         switch (type) {
  62
  63                 case EV_SYN:
  64                         switch (code) {
  65                                 case SYN_CONFIG:
  66                                         if (dev->event) dev->event(dev, type, code, value);
  67                                         break;
  68
  69                                 case SYN_REPORT:
  70                                         if (dev->sync) return;
  71                                         dev->sync = 1;
  72                                         break;
  73                         }
  74                         break;
  75
  76                 case EV_KEY:
  77
  78                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
  79                                 return;
  80
  81                         if (value == 2)
  82                                 break;
  83
  84                         change_bit(code, dev->key);
  85
  86                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
  87                                 dev->repeat_key = code;
  88                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
  89                         }
  90
  91                         break;
  92
  93                 case EV_SW:
  94
  95                         if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
  96                                 return;
  97
  98                         change_bit(code, dev->sw);
  99
 100                         break;
 101
 102                 case EV_ABS:
 103
 104                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
 105                                 return;
 106
 107                         if (dev->absfuzz[code]) {
 108                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
 109                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
 110                                         return;
 111
 112                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
 113                                     (value < dev->abs[code] + dev->absfuzz[code]))
 114                                         value = (dev->abs[code] * 3 + value) >> 2;
 115
 116                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
 117                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
 118                                         value = (dev->abs[code] + value) >> 1;
 119                         }
 120
 121                         if (dev->abs[code] == value)
 122                                 return;
 123
 124                         dev->abs[code] = value;
 125                         break;
 126
 127                 case EV_REL:
 128
 129                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
 130                                 return;
 131
 132                         break;
 133
 134                 case EV_MSC:
 135
 136                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
 137                                 return;
 138
 139                         if (dev->event) dev->event(dev, type, code, value);
 140
 141                         break;
 142
 143                 case EV_LED:
 144
 145                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
 146                                 return;
 147
 148                         change_bit(code, dev->led);
 149                         if (dev->event) dev->event(dev, type, code, value);
 150
 151                         break;
 152
 153                 case EV_SND:
 154
 155                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
 156                                 return;
 157
 158                         if (dev->event) dev->event(dev, type, code, value);
 159
 160                         break;
 161
 162                 case EV_REP:
 163
 164                         if (code > REP_MAX || value < 0 || dev->rep[code] == value) return;
 165
 166                         dev->rep[code] = value;
 167                         if (dev->event) dev->event(dev, type, code, value);
 168
 169                         break;
 170
 171                 case EV_FF:
 172                         if (dev->event) dev->event(dev, type, code, value);
 173                         break;
 174         }
 175
 176         if (type != EV_SYN)
 177                 dev->sync = 0;
 178
 179         if (dev->grab)
 180                 dev->grab->handler->event(dev->grab, type, code, value);
 181         else
 182                 list_for_each_entry(handle, &dev->h_list, d_node)
 183                         if (handle->open)
 184                                 handle->handler->event(handle, type, code, value);
 185 }
 186
 187 static void input_repeat_key(unsigned long data)
 188 {
 189         struct input_dev *dev = (void *) data;
 190
 191         if (!test_bit(dev->repeat_key, dev->key))
 192                 return;
 193
 194         input_event(dev, EV_KEY, dev->repeat_key, 2);
 195         input_sync(dev);
 196
 197         if (dev->rep[REP_PERIOD])
 198                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
 199 }
 200
 201 int input_accept_process(struct input_handle *handle, struct file *file)
 202 {
 203         if (handle->dev->accept)
 204                 return handle->dev->accept(handle->dev, file);
 205
 206         return 0;
 207 }
 208
 209 int input_grab_device(struct input_handle *handle)
 210 {
 211         if (handle->dev->grab)
 212                 return -EBUSY;
 213
 214         handle->dev->grab = handle;
 215         return 0;
 216 }
 217
 218 void input_release_device(struct input_handle *handle)
 219 {
 220         if (handle->dev->grab == handle)
 221                 handle->dev->grab = NULL;
 222 }
 223
 224 int input_open_device(struct input_handle *handle)
 225 {
 226         struct input_dev *dev = handle->dev;
 227         int err;
 228
 229         err = mutex_lock_interruptible(&dev->mutex);
 230         if (err)
 231                 return err;
 232
 233         handle->open++;
 234
 235         if (!dev->users++ && dev->open)
 236                 err = dev->open(dev);
 237
 238         if (err)
 239                 handle->open--;
 240
 241         mutex_unlock(&dev->mutex);
 242
 243         return err;
 244 }
 245
 246 int input_flush_device(struct input_handle* handle, struct file* file)
 247 {
 248         if (handle->dev->flush)
 249                 return handle->dev->flush(handle->dev, file);
 250
 251         return 0;
 252 }
 253
 254 void input_close_device(struct input_handle *handle)
 255 {
 256         struct input_dev *dev = handle->dev;
 257
 258         input_release_device(handle);
 259
 260         mutex_lock(&dev->mutex);
 261
 262         if (!--dev->users && dev->close)
 263                 dev->close(dev);
 264         handle->open--;
 265
 266         mutex_unlock(&dev->mutex);
 267 }
 268
 269 static void input_link_handle(struct input_handle *handle)
 270 {
 271         list_add_tail(&handle->d_node, &handle->dev->h_list);
 272         list_add_tail(&handle->h_node, &handle->handler->h_list);
 273 }
 274
 275 #define MATCH_BIT(bit, max) \
 276                 for (i = 0; i < NBITS(max); i++) \
 277                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
 278                                 break; \
 279                 if (i != NBITS(max)) \
 280                         continue;
 281
 282 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
 283 {
 284         int i;
 285
 286         for (; id->flags || id->driver_info; id++) {
 287
 288                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 289                         if (id->bustype != dev->id.bustype)
 290                                 continue;
 291
 292                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 293                         if (id->vendor != dev->id.vendor)
 294                                 continue;
 295
 296                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 297                         if (id->product != dev->id.product)
 298                                 continue;
 299
 300                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 301                         if (id->version != dev->id.version)
 302                                 continue;
 303
 304                 MATCH_BIT(evbit,  EV_MAX);
 305                 MATCH_BIT(keybit, KEY_MAX);
 306                 MATCH_BIT(relbit, REL_MAX);
 307                 MATCH_BIT(absbit, ABS_MAX);
 308                 MATCH_BIT(mscbit, MSC_MAX);
 309                 MATCH_BIT(ledbit, LED_MAX);
 310                 MATCH_BIT(sndbit, SND_MAX);
 311                 MATCH_BIT(ffbit,  FF_MAX);
 312                 MATCH_BIT(swbit,  SW_MAX);
 313
 314                 return id;
 315         }
 316
 317         return NULL;
 318 }
 319
 320 #ifdef CONFIG_PROC_FS
 321
 322 static struct proc_dir_entry *proc_bus_input_dir;
 323 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
 324 static int input_devices_state;
 325
 326 static inline void input_wakeup_procfs_readers(void)
 327 {
 328         input_devices_state++;
 329         wake_up(&input_devices_poll_wait);
 330 }
 331
 332 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
 333 {
 334         int state = input_devices_state;
 335         poll_wait(file, &input_devices_poll_wait, wait);
 336         if (state != input_devices_state)
 337                 return POLLIN | POLLRDNORM;
 338         return 0;
 339 }
 340
 341 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
 342 {
 343         struct list_head *node;
 344         loff_t i = 0;
 345
 346         list_for_each(node, list)
 347                 if (i++ == *pos)
 348                         return node;
 349
 350         return NULL;
 351 }
 352
 353 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
 354 {
 355         if (element->next == list)
 356                 return NULL;
 357
 358         ++(*pos);
 359         return element->next;
 360 }
 361
 362 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
 363 {
 364         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 365
 366         return list_get_nth_element(&input_dev_list, pos);
 367 }
 368
 369 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 370 {
 371         return list_get_next_element(&input_dev_list, v, pos);
 372 }
 373
 374 static void input_devices_seq_stop(struct seq_file *seq, void *v)
 375 {
 376         /* release lock here */
 377 }
 378
 379 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
 380                                    unsigned long *bitmap, int max)
 381 {
 382         int i;
 383
 384         for (i = NBITS(max) - 1; i > 0; i--)
 385                 if (bitmap[i])
 386                         break;
 387
 388         seq_printf(seq, "B: %s=", name);
 389         for (; i >= 0; i--)
 390                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
 391         seq_putc(seq, '\n');
 392 }
 393
 394 static int input_devices_seq_show(struct seq_file *seq, void *v)
 395 {
 396         struct input_dev *dev = container_of(v, struct input_dev, node);
 397         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 398         struct input_handle *handle;
 399
 400         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 401                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 402
 403         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 404         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 405         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
 406         seq_printf(seq, "H: Handlers=");
 407
 408         list_for_each_entry(handle, &dev->h_list, d_node)
 409                 seq_printf(seq, "%s ", handle->name);
 410         seq_putc(seq, '\n');
 411
 412         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
 413         if (test_bit(EV_KEY, dev->evbit))
 414                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
 415         if (test_bit(EV_REL, dev->evbit))
 416                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
 417         if (test_bit(EV_ABS, dev->evbit))
 418                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
 419         if (test_bit(EV_MSC, dev->evbit))
 420                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
 421         if (test_bit(EV_LED, dev->evbit))
 422                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
 423         if (test_bit(EV_SND, dev->evbit))
 424                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
 425         if (test_bit(EV_FF, dev->evbit))
 426                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
 427         if (test_bit(EV_SW, dev->evbit))
 428                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
 429
 430         seq_putc(seq, '\n');
 431
 432         kfree(path);
 433         return 0;
 434 }
 435
 436 static struct seq_operations input_devices_seq_ops = {
 437         .start  = input_devices_seq_start,
 438         .next   = input_devices_seq_next,
 439         .stop   = input_devices_seq_stop,
 440         .show   = input_devices_seq_show,
 441 };
 442
 443 static int input_proc_devices_open(struct inode *inode, struct file *file)
 444 {
 445         return seq_open(file, &input_devices_seq_ops);
 446 }
 447
 448 static struct file_operations input_devices_fileops = {
 449         .owner          = THIS_MODULE,
 450         .open           = input_proc_devices_open,
 451         .poll           = input_proc_devices_poll,
 452         .read           = seq_read,
 453         .llseek         = seq_lseek,
 454         .release        = seq_release,
 455 };
 456
 457 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
 458 {
 459         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 460         seq->private = (void *)(unsigned long)*pos;
 461         return list_get_nth_element(&input_handler_list, pos);
 462 }
 463
 464 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 465 {
 466         seq->private = (void *)(unsigned long)(*pos + 1);
 467         return list_get_next_element(&input_handler_list, v, pos);
 468 }
 469
 470 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
 471 {
 472         /* release lock here */
 473 }
 474
 475 static int input_handlers_seq_show(struct seq_file *seq, void *v)
 476 {
 477         struct input_handler *handler = container_of(v, struct input_handler, node);
 478
 479         seq_printf(seq, "N: Number=%ld Name=%s",
 480                    (unsigned long)seq->private, handler->name);
 481         if (handler->fops)
 482                 seq_printf(seq, " Minor=%d", handler->minor);
 483         seq_putc(seq, '\n');
 484
 485         return 0;
 486 }
 487 static struct seq_operations input_handlers_seq_ops = {
 488         .start  = input_handlers_seq_start,
 489         .next   = input_handlers_seq_next,
 490         .stop   = input_handlers_seq_stop,
 491         .show   = input_handlers_seq_show,
 492 };
 493
 494 static int input_proc_handlers_open(struct inode *inode, struct file *file)
 495 {
 496         return seq_open(file, &input_handlers_seq_ops);
 497 }
 498
 499 static struct file_operations input_handlers_fileops = {
 500         .owner          = THIS_MODULE,
 501         .open           = input_proc_handlers_open,
 502         .read           = seq_read,
 503         .llseek         = seq_lseek,
 504         .release        = seq_release,
 505 };
 506
 507 static int __init input_proc_init(void)
 508 {
 509         struct proc_dir_entry *entry;
 510
 511         proc_bus_input_dir = proc_mkdir("input", proc_bus);
 512         if (!proc_bus_input_dir)
 513                 return -ENOMEM;
 514
 515         proc_bus_input_dir->owner = THIS_MODULE;
 516
 517         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
 518         if (!entry)
 519                 goto fail1;
 520
 521         entry->owner = THIS_MODULE;
 522         entry->proc_fops = &input_devices_fileops;
 523
 524         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
 525         if (!entry)
 526                 goto fail2;
 527
 528         entry->owner = THIS_MODULE;
 529         entry->proc_fops = &input_handlers_fileops;
 530
 531         return 0;
 532
 533  fail2: remove_proc_entry("devices", proc_bus_input_dir);
 534  fail1: remove_proc_entry("input", proc_bus);
 535         return -ENOMEM;
 536 }
 537
 538 static void input_proc_exit(void)
 539 {
 540         remove_proc_entry("devices", proc_bus_input_dir);
 541         remove_proc_entry("handlers", proc_bus_input_dir);
 542         remove_proc_entry("input", proc_bus);
 543 }
 544
 545 #else /* !CONFIG_PROC_FS */
 546 static inline void input_wakeup_procfs_readers(void) { }
 547 static inline int input_proc_init(void) { return 0; }
 548 static inline void input_proc_exit(void) { }
 549 #endif
 550
 551 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
 552 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
 553 {                                                                               \
 554         struct input_dev *input_dev = to_input_dev(dev);                        \
 555         int retval;                                                             \
 556                                                                                 \
 557         retval = mutex_lock_interruptible(&input_dev->mutex);                   \
 558         if (retval)                                                             \
 559                 return retval;                                                  \
 560                                                                                 \
 561         retval = scnprintf(buf, PAGE_SIZE,                                      \
 562                            "%s\n", input_dev->name ? input_dev->name : "");     \
 563                                                                                 \
 564         mutex_unlock(&input_dev->mutex);                                        \
 565                                                                                 \
 566         return retval;                                                          \
 567 }                                                                               \
 568 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
 569
 570 INPUT_DEV_STRING_ATTR_SHOW(name);
 571 INPUT_DEV_STRING_ATTR_SHOW(phys);
 572 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 573
 574 static int input_print_modalias_bits(char *buf, int size,
 575                                      char name, unsigned long *bm,
 576                                      unsigned int min_bit, unsigned int max_bit)
 577 {
 578         int len = 0, i;
 579
 580         len += snprintf(buf, max(size, 0), "%c", name);
 581         for (i = min_bit; i < max_bit; i++)
 582                 if (bm[LONG(i)] & BIT(i))
 583                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
 584         return len;
 585 }
 586
 587 static int input_print_modalias(char *buf, int size, struct input_dev *id,
 588                                 int add_cr)
 589 {
 590         int len;
 591
 592         len = snprintf(buf, max(size, 0),
 593                        "input:b%04Xv%04Xp%04Xe%04X-",
 594                        id->id.bustype, id->id.vendor,
 595                        id->id.product, id->id.version);
 596
 597         len += input_print_modalias_bits(buf + len, size - len,
 598                                 'e', id->evbit, 0, EV_MAX);
 599         len += input_print_modalias_bits(buf + len, size - len,
 600                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
 601         len += input_print_modalias_bits(buf + len, size - len,
 602                                 'r', id->relbit, 0, REL_MAX);
 603         len += input_print_modalias_bits(buf + len, size - len,
 604                                 'a', id->absbit, 0, ABS_MAX);
 605         len += input_print_modalias_bits(buf + len, size - len,
 606                                 'm', id->mscbit, 0, MSC_MAX);
 607         len += input_print_modalias_bits(buf + len, size - len,
 608                                 'l', id->ledbit, 0, LED_MAX);
 609         len += input_print_modalias_bits(buf + len, size - len,
 610                                 's', id->sndbit, 0, SND_MAX);
 611         len += input_print_modalias_bits(buf + len, size - len,
 612                                 'f', id->ffbit, 0, FF_MAX);
 613         len += input_print_modalias_bits(buf + len, size - len,
 614                                 'w', id->swbit, 0, SW_MAX);
 615
 616         if (add_cr)
 617                 len += snprintf(buf + len, max(size - len, 0), "\n");
 618
 619         return len;
 620 }
 621
 622 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
 623 {
 624         struct input_dev *id = to_input_dev(dev);
 625         ssize_t len;
 626
 627         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
 628
 629         return max_t(int, len, PAGE_SIZE);
 630 }
 631 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 632
 633 static struct attribute *input_dev_attrs[] = {
 634         &class_device_attr_name.attr,
 635         &class_device_attr_phys.attr,
 636         &class_device_attr_uniq.attr,
 637         &class_device_attr_modalias.attr,
 638         NULL
 639 };
 640
 641 static struct attribute_group input_dev_attr_group = {
 642         .attrs  = input_dev_attrs,
 643 };
 644
 645 #define INPUT_DEV_ID_ATTR(name)                                                 \
 646 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
 647 {                                                                               \
 648         struct input_dev *input_dev = to_input_dev(dev);                        \
 649         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
 650 }                                                                               \
 651 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
 652
 653 INPUT_DEV_ID_ATTR(bustype);
 654 INPUT_DEV_ID_ATTR(vendor);
 655 INPUT_DEV_ID_ATTR(product);
 656 INPUT_DEV_ID_ATTR(version);
 657
 658 static struct attribute *input_dev_id_attrs[] = {
 659         &class_device_attr_bustype.attr,
 660         &class_device_attr_vendor.attr,
 661         &class_device_attr_product.attr,
 662         &class_device_attr_version.attr,
 663         NULL
 664 };
 665
 666 static struct attribute_group input_dev_id_attr_group = {
 667         .name   = "id",
 668         .attrs  = input_dev_id_attrs,
 669 };
 670
 671 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
 672                               int max, int add_cr)
 673 {
 674         int i;
 675         int len = 0;
 676
 677         for (i = NBITS(max) - 1; i > 0; i--)
 678                 if (bitmap[i])
 679                         break;
 680
 681         for (; i >= 0; i--)
 682                 len += snprintf(buf + len, max(buf_size - len, 0),
 683                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
 684
 685         if (add_cr)
 686                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
 687
 688         return len;
 689 }
 690
 691 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
 692 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
 693 {                                                                               \
 694         struct input_dev *input_dev = to_input_dev(dev);                        \
 695         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
 696                                      input_dev->bm##bit, ev##_MAX, 1);          \
 697         return min_t(int, len, PAGE_SIZE);                                      \
 698 }                                                                               \
 699 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
 700
 701 INPUT_DEV_CAP_ATTR(EV, ev);
 702 INPUT_DEV_CAP_ATTR(KEY, key);
 703 INPUT_DEV_CAP_ATTR(REL, rel);
 704 INPUT_DEV_CAP_ATTR(ABS, abs);
 705 INPUT_DEV_CAP_ATTR(MSC, msc);
 706 INPUT_DEV_CAP_ATTR(LED, led);
 707 INPUT_DEV_CAP_ATTR(SND, snd);
 708 INPUT_DEV_CAP_ATTR(FF, ff);
 709 INPUT_DEV_CAP_ATTR(SW, sw);
 710
 711 static struct attribute *input_dev_caps_attrs[] = {
 712         &class_device_attr_ev.attr,
 713         &class_device_attr_key.attr,
 714         &class_device_attr_rel.attr,
 715         &class_device_attr_abs.attr,
 716         &class_device_attr_msc.attr,
 717         &class_device_attr_led.attr,
 718         &class_device_attr_snd.attr,
 719         &class_device_attr_ff.attr,
 720         &class_device_attr_sw.attr,
 721         NULL
 722 };
 723
 724 static struct attribute_group input_dev_caps_attr_group = {
 725         .name   = "capabilities",
 726         .attrs  = input_dev_caps_attrs,
 727 };
 728
 729 static void input_dev_release(struct class_device *class_dev)
 730 {
 731         struct input_dev *dev = to_input_dev(class_dev);
 732
 733         kfree(dev);
 734         module_put(THIS_MODULE);
 735 }
 736
 737 /*
 738  * Input uevent interface - loading event handlers based on
 739  * device bitfields.
 740  */
 741 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
 742                                    char *buffer, int buffer_size, int *cur_len,
 743                                    const char *name, unsigned long *bitmap, int max)
 744 {
 745         if (*cur_index >= num_envp - 1)
 746                 return -ENOMEM;
 747
 748         envp[*cur_index] = buffer + *cur_len;
 749
 750         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
 751         if (*cur_len >= buffer_size)
 752                 return -ENOMEM;
 753
 754         *cur_len += input_print_bitmap(buffer + *cur_len,
 755                                         max(buffer_size - *cur_len, 0),
 756                                         bitmap, max, 0) + 1;
 757         if (*cur_len > buffer_size)
 758                 return -ENOMEM;
 759
 760         (*cur_index)++;
 761         return 0;
 762 }
 763
 764 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
 765                                          char *buffer, int buffer_size, int *cur_len,
 766                                          struct input_dev *dev)
 767 {
 768         if (*cur_index >= num_envp - 1)
 769                 return -ENOMEM;
 770
 771         envp[*cur_index] = buffer + *cur_len;
 772
 773         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
 774                              "MODALIAS=");
 775         if (*cur_len >= buffer_size)
 776                 return -ENOMEM;
 777
 778         *cur_len += input_print_modalias(buffer + *cur_len,
 779                                          max(buffer_size - *cur_len, 0),
 780                                          dev, 0) + 1;
 781         if (*cur_len > buffer_size)
 782                 return -ENOMEM;
 783
 784         (*cur_index)++;
 785         return 0;
 786 }
 787
 788 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
 789         do {                                                            \
 790                 int err = add_uevent_var(envp, num_envp, &i,            \
 791                                         buffer, buffer_size, &len,      \
 792                                         fmt, val);                      \
 793                 if (err)                                                \
 794                         return err;                                     \
 795         } while (0)
 796
 797 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
 798         do {                                                            \
 799                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
 800                                         buffer, buffer_size, &len,      \
 801                                         name, bm, max);                 \
 802                 if (err)                                                \
 803                         return err;                                     \
 804         } while (0)
 805
 806 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
 807         do {                                                            \
 808                 int err = input_add_uevent_modalias_var(envp,           \
 809                                         num_envp, &i,                   \
 810                                         buffer, buffer_size, &len,      \
 811                                         dev);                           \
 812                 if (err)                                                \
 813                         return err;                                     \
 814         } while (0)
 815
 816 static int input_dev_uevent(struct class_device *cdev, char **envp,
 817                             int num_envp, char *buffer, int buffer_size)
 818 {
 819         struct input_dev *dev = to_input_dev(cdev);
 820         int i = 0;
 821         int len = 0;
 822
 823         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
 824                                 dev->id.bustype, dev->id.vendor,
 825                                 dev->id.product, dev->id.version);
 826         if (dev->name)
 827                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
 828         if (dev->phys)
 829                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
 830         if (dev->uniq)
 831                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
 832
 833         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
 834         if (test_bit(EV_KEY, dev->evbit))
 835                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
 836         if (test_bit(EV_REL, dev->evbit))
 837                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
 838         if (test_bit(EV_ABS, dev->evbit))
 839                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
 840         if (test_bit(EV_MSC, dev->evbit))
 841                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
 842         if (test_bit(EV_LED, dev->evbit))
 843                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
 844         if (test_bit(EV_SND, dev->evbit))
 845                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
 846         if (test_bit(EV_FF, dev->evbit))
 847                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
 848         if (test_bit(EV_SW, dev->evbit))
 849                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
 850
 851         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
 852
 853         envp[i] = NULL;
 854         return 0;
 855 }
 856
 857 struct class input_class = {
 858         .name                   = "input",
 859         .release                = input_dev_release,
 860         .uevent                 = input_dev_uevent,
 861 };
 862
 863 struct input_dev *input_allocate_device(void)
 864 {
 865         struct input_dev *dev;
 866
 867         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
 868         if (dev) {
 869                 dev->dynalloc = 1;
 870                 dev->cdev.class = &input_class;
 871                 class_device_initialize(&dev->cdev);
 872                 INIT_LIST_HEAD(&dev->h_list);
 873                 INIT_LIST_HEAD(&dev->node);
 874         }
 875
 876         return dev;
 877 }
 878
 879 int input_register_device(struct input_dev *dev)
 880 {
 881         static atomic_t input_no = ATOMIC_INIT(0);
 882         struct input_handle *handle;
 883         struct input_handler *handler;
 884         struct input_device_id *id;
 885         const char *path;
 886         int error;
 887
 888         if (!dev->dynalloc) {
 889                 printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
 890                         "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n",
 891                         dev->name ? dev->name : "<Unknown>");
 892                 return -EINVAL;
 893         }
 894
 895         mutex_init(&dev->mutex);
 896         set_bit(EV_SYN, dev->evbit);
 897
 898         /*
 899          * If delay and period are pre-set by the driver, then autorepeating
 900          * is handled by the driver itself and we don't do it in input.c.
 901          */
 902
 903         init_timer(&dev->timer);
 904         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
 905                 dev->timer.data = (long) dev;
 906                 dev->timer.function = input_repeat_key;
 907                 dev->rep[REP_DELAY] = 250;
 908                 dev->rep[REP_PERIOD] = 33;
 909         }
 910
 911         INIT_LIST_HEAD(&dev->h_list);
 912         list_add_tail(&dev->node, &input_dev_list);
 913
 914         dev->cdev.class = &input_class;
 915         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
 916                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
 917
 918         error = class_device_add(&dev->cdev);
 919         if (error)
 920                 return error;
 921
 922         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
 923         if (error)
 924                 goto fail1;
 925
 926         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 927         if (error)
 928                 goto fail2;
 929
 930         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
 931         if (error)
 932                 goto fail3;
 933
 934         __module_get(THIS_MODULE);
 935
 936         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 937         printk(KERN_INFO "input: %s as %s\n",
 938                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
 939         kfree(path);
 940
 941         list_for_each_entry(handler, &input_handler_list, node)
 942                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 943                         if ((id = input_match_device(handler->id_table, dev)))
 944                                 if ((handle = handler->connect(handler, dev, id)))
 945                                         input_link_handle(handle);
 946
 947         input_wakeup_procfs_readers();
 948
 949         return 0;
 950
 951  fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 952  fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
 953  fail1: class_device_del(&dev->cdev);
 954         return error;
 955 }
 956
 957 void input_unregister_device(struct input_dev *dev)
 958 {
 959         struct list_head * node, * next;
 960
 961         if (!dev) return;
 962
 963         del_timer_sync(&dev->timer);
 964
 965         list_for_each_safe(node, next, &dev->h_list) {
 966                 struct input_handle * handle = to_handle(node);
 967                 list_del_init(&handle->d_node);
 968                 list_del_init(&handle->h_node);
 969                 handle->handler->disconnect(handle);
 970         }
 971
 972         list_del_init(&dev->node);
 973
 974         sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
 975         sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 976         sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
 977         class_device_unregister(&dev->cdev);
 978
 979         input_wakeup_procfs_readers();
 980 }
 981
 982 void input_register_handler(struct input_handler *handler)
 983 {
 984         struct input_dev *dev;
 985         struct input_handle *handle;
 986         struct input_device_id *id;
 987
 988         if (!handler) return;
 989
 990         INIT_LIST_HEAD(&handler->h_list);
 991
 992         if (handler->fops != NULL)
 993                 input_table[handler->minor >> 5] = handler;
 994
 995         list_add_tail(&handler->node, &input_handler_list);
 996
 997         list_for_each_entry(dev, &input_dev_list, node)
 998                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 999                         if ((id = input_match_device(handler->id_table, dev)))
1000                                 if ((handle = handler->connect(handler, dev, id)))
1001                                         input_link_handle(handle);
1002
1003         input_wakeup_procfs_readers();
1004 }
1005
1006 void input_unregister_handler(struct input_handler *handler)
1007 {
1008         struct list_head * node, * next;
1009
1010         list_for_each_safe(node, next, &handler->h_list) {
1011                 struct input_handle * handle = to_handle_h(node);
1012                 list_del_init(&handle->h_node);
1013                 list_del_init(&handle->d_node);
1014                 handler->disconnect(handle);
1015         }
1016
1017         list_del_init(&handler->node);
1018
1019         if (handler->fops != NULL)
1020                 input_table[handler->minor >> 5] = NULL;
1021
1022         input_wakeup_procfs_readers();
1023 }
1024
1025 static int input_open_file(struct inode *inode, struct file *file)
1026 {
1027         struct input_handler *handler = input_table[iminor(inode) >> 5];
1028         const struct file_operations *old_fops, *new_fops = NULL;
1029         int err;
1030
1031         /* No load-on-demand here? */
1032         if (!handler || !(new_fops = fops_get(handler->fops)))
1033                 return -ENODEV;
1034
1035         /*
1036          * That's _really_ odd. Usually NULL ->open means "nothing special",
1037          * not "no device". Oh, well...
1038          */
1039         if (!new_fops->open) {
1040                 fops_put(new_fops);
1041                 return -ENODEV;
1042         }
1043         old_fops = file->f_op;
1044         file->f_op = new_fops;
1045
1046         err = new_fops->open(inode, file);
1047
1048         if (err) {
1049                 fops_put(file->f_op);
1050                 file->f_op = fops_get(old_fops);
1051         }
1052         fops_put(old_fops);
1053         return err;
1054 }
1055
1056 static struct file_operations input_fops = {
1057         .owner = THIS_MODULE,
1058         .open = input_open_file,
1059 };
1060
1061 static int __init input_init(void)
1062 {
1063         int err;
1064
1065         err = class_register(&input_class);
1066         if (err) {
1067                 printk(KERN_ERR "input: unable to register input_dev class\n");
1068                 return err;
1069         }
1070
1071         err = input_proc_init();
1072         if (err)
1073                 goto fail1;
1074
1075         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1076         if (err) {
1077                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1078                 goto fail2;
1079         }
1080
1081         return 0;
1082
1083  fail2: input_proc_exit();
1084  fail1: class_unregister(&input_class);
1085         return err;
1086 }
1087
1088 static void __exit input_exit(void)
1089 {
1090         input_proc_exit();
1091         unregister_chrdev(INPUT_MAJOR, "input");
1092         class_unregister(&input_class);
1093 }
1094
1095 subsys_initcall(input_init);
1096 module_exit(input_exit);