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 (!!test_bit(code, dev->snd) != !!value)
 159                                 change_bit(code, dev->snd);
 160
 161                         if (dev->event) dev->event(dev, type, code, value);
 162
 163                         break;
 164
 165                 case EV_REP:
 166
 167                         if (code > REP_MAX || value < 0 || dev->rep[code] == value) return;
 168
 169                         dev->rep[code] = value;
 170                         if (dev->event) dev->event(dev, type, code, value);
 171
 172                         break;
 173
 174                 case EV_FF:
 175                         if (dev->event) dev->event(dev, type, code, value);
 176                         break;
 177         }
 178
 179         if (type != EV_SYN)
 180                 dev->sync = 0;
 181
 182         if (dev->grab)
 183                 dev->grab->handler->event(dev->grab, type, code, value);
 184         else
 185                 list_for_each_entry(handle, &dev->h_list, d_node)
 186                         if (handle->open)
 187                                 handle->handler->event(handle, type, code, value);
 188 }
 189
 190 static void input_repeat_key(unsigned long data)
 191 {
 192         struct input_dev *dev = (void *) data;
 193
 194         if (!test_bit(dev->repeat_key, dev->key))
 195                 return;
 196
 197         input_event(dev, EV_KEY, dev->repeat_key, 2);
 198         input_sync(dev);
 199
 200         if (dev->rep[REP_PERIOD])
 201                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
 202 }
 203
 204 int input_accept_process(struct input_handle *handle, struct file *file)
 205 {
 206         if (handle->dev->accept)
 207                 return handle->dev->accept(handle->dev, file);
 208
 209         return 0;
 210 }
 211
 212 int input_grab_device(struct input_handle *handle)
 213 {
 214         if (handle->dev->grab)
 215                 return -EBUSY;
 216
 217         handle->dev->grab = handle;
 218         return 0;
 219 }
 220
 221 void input_release_device(struct input_handle *handle)
 222 {
 223         if (handle->dev->grab == handle)
 224                 handle->dev->grab = NULL;
 225 }
 226
 227 int input_open_device(struct input_handle *handle)
 228 {
 229         struct input_dev *dev = handle->dev;
 230         int err;
 231
 232         err = mutex_lock_interruptible(&dev->mutex);
 233         if (err)
 234                 return err;
 235
 236         handle->open++;
 237
 238         if (!dev->users++ && dev->open)
 239                 err = dev->open(dev);
 240
 241         if (err)
 242                 handle->open--;
 243
 244         mutex_unlock(&dev->mutex);
 245
 246         return err;
 247 }
 248
 249 int input_flush_device(struct input_handle* handle, struct file* file)
 250 {
 251         if (handle->dev->flush)
 252                 return handle->dev->flush(handle->dev, file);
 253
 254         return 0;
 255 }
 256
 257 void input_close_device(struct input_handle *handle)
 258 {
 259         struct input_dev *dev = handle->dev;
 260
 261         input_release_device(handle);
 262
 263         mutex_lock(&dev->mutex);
 264
 265         if (!--dev->users && dev->close)
 266                 dev->close(dev);
 267         handle->open--;
 268
 269         mutex_unlock(&dev->mutex);
 270 }
 271
 272 static void input_link_handle(struct input_handle *handle)
 273 {
 274         list_add_tail(&handle->d_node, &handle->dev->h_list);
 275         list_add_tail(&handle->h_node, &handle->handler->h_list);
 276 }
 277
 278 #define MATCH_BIT(bit, max) \
 279                 for (i = 0; i < NBITS(max); i++) \
 280                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
 281                                 break; \
 282                 if (i != NBITS(max)) \
 283                         continue;
 284
 285 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
 286 {
 287         int i;
 288
 289         for (; id->flags || id->driver_info; id++) {
 290
 291                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 292                         if (id->bustype != dev->id.bustype)
 293                                 continue;
 294
 295                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 296                         if (id->vendor != dev->id.vendor)
 297                                 continue;
 298
 299                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 300                         if (id->product != dev->id.product)
 301                                 continue;
 302
 303                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 304                         if (id->version != dev->id.version)
 305                                 continue;
 306
 307                 MATCH_BIT(evbit,  EV_MAX);
 308                 MATCH_BIT(keybit, KEY_MAX);
 309                 MATCH_BIT(relbit, REL_MAX);
 310                 MATCH_BIT(absbit, ABS_MAX);
 311                 MATCH_BIT(mscbit, MSC_MAX);
 312                 MATCH_BIT(ledbit, LED_MAX);
 313                 MATCH_BIT(sndbit, SND_MAX);
 314                 MATCH_BIT(ffbit,  FF_MAX);
 315                 MATCH_BIT(swbit,  SW_MAX);
 316
 317                 return id;
 318         }
 319
 320         return NULL;
 321 }
 322
 323 #ifdef CONFIG_PROC_FS
 324
 325 static struct proc_dir_entry *proc_bus_input_dir;
 326 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
 327 static int input_devices_state;
 328
 329 static inline void input_wakeup_procfs_readers(void)
 330 {
 331         input_devices_state++;
 332         wake_up(&input_devices_poll_wait);
 333 }
 334
 335 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
 336 {
 337         int state = input_devices_state;
 338         poll_wait(file, &input_devices_poll_wait, wait);
 339         if (state != input_devices_state)
 340                 return POLLIN | POLLRDNORM;
 341         return 0;
 342 }
 343
 344 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
 345 {
 346         struct list_head *node;
 347         loff_t i = 0;
 348
 349         list_for_each(node, list)
 350                 if (i++ == *pos)
 351                         return node;
 352
 353         return NULL;
 354 }
 355
 356 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
 357 {
 358         if (element->next == list)
 359                 return NULL;
 360
 361         ++(*pos);
 362         return element->next;
 363 }
 364
 365 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
 366 {
 367         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 368
 369         return list_get_nth_element(&input_dev_list, pos);
 370 }
 371
 372 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 373 {
 374         return list_get_next_element(&input_dev_list, v, pos);
 375 }
 376
 377 static void input_devices_seq_stop(struct seq_file *seq, void *v)
 378 {
 379         /* release lock here */
 380 }
 381
 382 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
 383                                    unsigned long *bitmap, int max)
 384 {
 385         int i;
 386
 387         for (i = NBITS(max) - 1; i > 0; i--)
 388                 if (bitmap[i])
 389                         break;
 390
 391         seq_printf(seq, "B: %s=", name);
 392         for (; i >= 0; i--)
 393                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
 394         seq_putc(seq, '\n');
 395 }
 396
 397 static int input_devices_seq_show(struct seq_file *seq, void *v)
 398 {
 399         struct input_dev *dev = container_of(v, struct input_dev, node);
 400         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 401         struct input_handle *handle;
 402
 403         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 404                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 405
 406         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 407         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 408         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
 409         seq_printf(seq, "H: Handlers=");
 410
 411         list_for_each_entry(handle, &dev->h_list, d_node)
 412                 seq_printf(seq, "%s ", handle->name);
 413         seq_putc(seq, '\n');
 414
 415         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
 416         if (test_bit(EV_KEY, dev->evbit))
 417                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
 418         if (test_bit(EV_REL, dev->evbit))
 419                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
 420         if (test_bit(EV_ABS, dev->evbit))
 421                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
 422         if (test_bit(EV_MSC, dev->evbit))
 423                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
 424         if (test_bit(EV_LED, dev->evbit))
 425                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
 426         if (test_bit(EV_SND, dev->evbit))
 427                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
 428         if (test_bit(EV_FF, dev->evbit))
 429                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
 430         if (test_bit(EV_SW, dev->evbit))
 431                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
 432
 433         seq_putc(seq, '\n');
 434
 435         kfree(path);
 436         return 0;
 437 }
 438
 439 static struct seq_operations input_devices_seq_ops = {
 440         .start  = input_devices_seq_start,
 441         .next   = input_devices_seq_next,
 442         .stop   = input_devices_seq_stop,
 443         .show   = input_devices_seq_show,
 444 };
 445
 446 static int input_proc_devices_open(struct inode *inode, struct file *file)
 447 {
 448         return seq_open(file, &input_devices_seq_ops);
 449 }
 450
 451 static struct file_operations input_devices_fileops = {
 452         .owner          = THIS_MODULE,
 453         .open           = input_proc_devices_open,
 454         .poll           = input_proc_devices_poll,
 455         .read           = seq_read,
 456         .llseek         = seq_lseek,
 457         .release        = seq_release,
 458 };
 459
 460 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
 461 {
 462         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 463         seq->private = (void *)(unsigned long)*pos;
 464         return list_get_nth_element(&input_handler_list, pos);
 465 }
 466
 467 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 468 {
 469         seq->private = (void *)(unsigned long)(*pos + 1);
 470         return list_get_next_element(&input_handler_list, v, pos);
 471 }
 472
 473 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
 474 {
 475         /* release lock here */
 476 }
 477
 478 static int input_handlers_seq_show(struct seq_file *seq, void *v)
 479 {
 480         struct input_handler *handler = container_of(v, struct input_handler, node);
 481
 482         seq_printf(seq, "N: Number=%ld Name=%s",
 483                    (unsigned long)seq->private, handler->name);
 484         if (handler->fops)
 485                 seq_printf(seq, " Minor=%d", handler->minor);
 486         seq_putc(seq, '\n');
 487
 488         return 0;
 489 }
 490 static struct seq_operations input_handlers_seq_ops = {
 491         .start  = input_handlers_seq_start,
 492         .next   = input_handlers_seq_next,
 493         .stop   = input_handlers_seq_stop,
 494         .show   = input_handlers_seq_show,
 495 };
 496
 497 static int input_proc_handlers_open(struct inode *inode, struct file *file)
 498 {
 499         return seq_open(file, &input_handlers_seq_ops);
 500 }
 501
 502 static struct file_operations input_handlers_fileops = {
 503         .owner          = THIS_MODULE,
 504         .open           = input_proc_handlers_open,
 505         .read           = seq_read,
 506         .llseek         = seq_lseek,
 507         .release        = seq_release,
 508 };
 509
 510 static int __init input_proc_init(void)
 511 {
 512         struct proc_dir_entry *entry;
 513
 514         proc_bus_input_dir = proc_mkdir("input", proc_bus);
 515         if (!proc_bus_input_dir)
 516                 return -ENOMEM;
 517
 518         proc_bus_input_dir->owner = THIS_MODULE;
 519
 520         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
 521         if (!entry)
 522                 goto fail1;
 523
 524         entry->owner = THIS_MODULE;
 525         entry->proc_fops = &input_devices_fileops;
 526
 527         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
 528         if (!entry)
 529                 goto fail2;
 530
 531         entry->owner = THIS_MODULE;
 532         entry->proc_fops = &input_handlers_fileops;
 533
 534         return 0;
 535
 536  fail2: remove_proc_entry("devices", proc_bus_input_dir);
 537  fail1: remove_proc_entry("input", proc_bus);
 538         return -ENOMEM;
 539 }
 540
 541 static void input_proc_exit(void)
 542 {
 543         remove_proc_entry("devices", proc_bus_input_dir);
 544         remove_proc_entry("handlers", proc_bus_input_dir);
 545         remove_proc_entry("input", proc_bus);
 546 }
 547
 548 #else /* !CONFIG_PROC_FS */
 549 static inline void input_wakeup_procfs_readers(void) { }
 550 static inline int input_proc_init(void) { return 0; }
 551 static inline void input_proc_exit(void) { }
 552 #endif
 553
 554 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
 555 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
 556 {                                                                               \
 557         struct input_dev *input_dev = to_input_dev(dev);                        \
 558         int retval;                                                             \
 559                                                                                 \
 560         retval = mutex_lock_interruptible(&input_dev->mutex);                   \
 561         if (retval)                                                             \
 562                 return retval;                                                  \
 563                                                                                 \
 564         retval = scnprintf(buf, PAGE_SIZE,                                      \
 565                            "%s\n", input_dev->name ? input_dev->name : "");     \
 566                                                                                 \
 567         mutex_unlock(&input_dev->mutex);                                        \
 568                                                                                 \
 569         return retval;                                                          \
 570 }                                                                               \
 571 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
 572
 573 INPUT_DEV_STRING_ATTR_SHOW(name);
 574 INPUT_DEV_STRING_ATTR_SHOW(phys);
 575 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 576
 577 static int input_print_modalias_bits(char *buf, int size,
 578                                      char name, unsigned long *bm,
 579                                      unsigned int min_bit, unsigned int max_bit)
 580 {
 581         int len = 0, i;
 582
 583         len += snprintf(buf, max(size, 0), "%c", name);
 584         for (i = min_bit; i < max_bit; i++)
 585                 if (bm[LONG(i)] & BIT(i))
 586                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
 587         return len;
 588 }
 589
 590 static int input_print_modalias(char *buf, int size, struct input_dev *id,
 591                                 int add_cr)
 592 {
 593         int len;
 594
 595         len = snprintf(buf, max(size, 0),
 596                        "input:b%04Xv%04Xp%04Xe%04X-",
 597                        id->id.bustype, id->id.vendor,
 598                        id->id.product, id->id.version);
 599
 600         len += input_print_modalias_bits(buf + len, size - len,
 601                                 'e', id->evbit, 0, EV_MAX);
 602         len += input_print_modalias_bits(buf + len, size - len,
 603                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
 604         len += input_print_modalias_bits(buf + len, size - len,
 605                                 'r', id->relbit, 0, REL_MAX);
 606         len += input_print_modalias_bits(buf + len, size - len,
 607                                 'a', id->absbit, 0, ABS_MAX);
 608         len += input_print_modalias_bits(buf + len, size - len,
 609                                 'm', id->mscbit, 0, MSC_MAX);
 610         len += input_print_modalias_bits(buf + len, size - len,
 611                                 'l', id->ledbit, 0, LED_MAX);
 612         len += input_print_modalias_bits(buf + len, size - len,
 613                                 's', id->sndbit, 0, SND_MAX);
 614         len += input_print_modalias_bits(buf + len, size - len,
 615                                 'f', id->ffbit, 0, FF_MAX);
 616         len += input_print_modalias_bits(buf + len, size - len,
 617                                 'w', id->swbit, 0, SW_MAX);
 618
 619         if (add_cr)
 620                 len += snprintf(buf + len, max(size - len, 0), "\n");
 621
 622         return len;
 623 }
 624
 625 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
 626 {
 627         struct input_dev *id = to_input_dev(dev);
 628         ssize_t len;
 629
 630         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
 631
 632         return max_t(int, len, PAGE_SIZE);
 633 }
 634 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 635
 636 static struct attribute *input_dev_attrs[] = {
 637         &class_device_attr_name.attr,
 638         &class_device_attr_phys.attr,
 639         &class_device_attr_uniq.attr,
 640         &class_device_attr_modalias.attr,
 641         NULL
 642 };
 643
 644 static struct attribute_group input_dev_attr_group = {
 645         .attrs  = input_dev_attrs,
 646 };
 647
 648 #define INPUT_DEV_ID_ATTR(name)                                                 \
 649 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
 650 {                                                                               \
 651         struct input_dev *input_dev = to_input_dev(dev);                        \
 652         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
 653 }                                                                               \
 654 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
 655
 656 INPUT_DEV_ID_ATTR(bustype);
 657 INPUT_DEV_ID_ATTR(vendor);
 658 INPUT_DEV_ID_ATTR(product);
 659 INPUT_DEV_ID_ATTR(version);
 660
 661 static struct attribute *input_dev_id_attrs[] = {
 662         &class_device_attr_bustype.attr,
 663         &class_device_attr_vendor.attr,
 664         &class_device_attr_product.attr,
 665         &class_device_attr_version.attr,
 666         NULL
 667 };
 668
 669 static struct attribute_group input_dev_id_attr_group = {
 670         .name   = "id",
 671         .attrs  = input_dev_id_attrs,
 672 };
 673
 674 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
 675                               int max, int add_cr)
 676 {
 677         int i;
 678         int len = 0;
 679
 680         for (i = NBITS(max) - 1; i > 0; i--)
 681                 if (bitmap[i])
 682                         break;
 683
 684         for (; i >= 0; i--)
 685                 len += snprintf(buf + len, max(buf_size - len, 0),
 686                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
 687
 688         if (add_cr)
 689                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
 690
 691         return len;
 692 }
 693
 694 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
 695 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
 696 {                                                                               \
 697         struct input_dev *input_dev = to_input_dev(dev);                        \
 698         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
 699                                      input_dev->bm##bit, ev##_MAX, 1);          \
 700         return min_t(int, len, PAGE_SIZE);                                      \
 701 }                                                                               \
 702 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
 703
 704 INPUT_DEV_CAP_ATTR(EV, ev);
 705 INPUT_DEV_CAP_ATTR(KEY, key);
 706 INPUT_DEV_CAP_ATTR(REL, rel);
 707 INPUT_DEV_CAP_ATTR(ABS, abs);
 708 INPUT_DEV_CAP_ATTR(MSC, msc);
 709 INPUT_DEV_CAP_ATTR(LED, led);
 710 INPUT_DEV_CAP_ATTR(SND, snd);
 711 INPUT_DEV_CAP_ATTR(FF, ff);
 712 INPUT_DEV_CAP_ATTR(SW, sw);
 713
 714 static struct attribute *input_dev_caps_attrs[] = {
 715         &class_device_attr_ev.attr,
 716         &class_device_attr_key.attr,
 717         &class_device_attr_rel.attr,
 718         &class_device_attr_abs.attr,
 719         &class_device_attr_msc.attr,
 720         &class_device_attr_led.attr,
 721         &class_device_attr_snd.attr,
 722         &class_device_attr_ff.attr,
 723         &class_device_attr_sw.attr,
 724         NULL
 725 };
 726
 727 static struct attribute_group input_dev_caps_attr_group = {
 728         .name   = "capabilities",
 729         .attrs  = input_dev_caps_attrs,
 730 };
 731
 732 static void input_dev_release(struct class_device *class_dev)
 733 {
 734         struct input_dev *dev = to_input_dev(class_dev);
 735
 736         kfree(dev);
 737         module_put(THIS_MODULE);
 738 }
 739
 740 /*
 741  * Input uevent interface - loading event handlers based on
 742  * device bitfields.
 743  */
 744 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
 745                                    char *buffer, int buffer_size, int *cur_len,
 746                                    const char *name, unsigned long *bitmap, int max)
 747 {
 748         if (*cur_index >= num_envp - 1)
 749                 return -ENOMEM;
 750
 751         envp[*cur_index] = buffer + *cur_len;
 752
 753         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
 754         if (*cur_len >= buffer_size)
 755                 return -ENOMEM;
 756
 757         *cur_len += input_print_bitmap(buffer + *cur_len,
 758                                         max(buffer_size - *cur_len, 0),
 759                                         bitmap, max, 0) + 1;
 760         if (*cur_len > buffer_size)
 761                 return -ENOMEM;
 762
 763         (*cur_index)++;
 764         return 0;
 765 }
 766
 767 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
 768                                          char *buffer, int buffer_size, int *cur_len,
 769                                          struct input_dev *dev)
 770 {
 771         if (*cur_index >= num_envp - 1)
 772                 return -ENOMEM;
 773
 774         envp[*cur_index] = buffer + *cur_len;
 775
 776         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
 777                              "MODALIAS=");
 778         if (*cur_len >= buffer_size)
 779                 return -ENOMEM;
 780
 781         *cur_len += input_print_modalias(buffer + *cur_len,
 782                                          max(buffer_size - *cur_len, 0),
 783                                          dev, 0) + 1;
 784         if (*cur_len > buffer_size)
 785                 return -ENOMEM;
 786
 787         (*cur_index)++;
 788         return 0;
 789 }
 790
 791 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
 792         do {                                                            \
 793                 int err = add_uevent_var(envp, num_envp, &i,            \
 794                                         buffer, buffer_size, &len,      \
 795                                         fmt, val);                      \
 796                 if (err)                                                \
 797                         return err;                                     \
 798         } while (0)
 799
 800 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
 801         do {                                                            \
 802                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
 803                                         buffer, buffer_size, &len,      \
 804                                         name, bm, max);                 \
 805                 if (err)                                                \
 806                         return err;                                     \
 807         } while (0)
 808
 809 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
 810         do {                                                            \
 811                 int err = input_add_uevent_modalias_var(envp,           \
 812                                         num_envp, &i,                   \
 813                                         buffer, buffer_size, &len,      \
 814                                         dev);                           \
 815                 if (err)                                                \
 816                         return err;                                     \
 817         } while (0)
 818
 819 static int input_dev_uevent(struct class_device *cdev, char **envp,
 820                             int num_envp, char *buffer, int buffer_size)
 821 {
 822         struct input_dev *dev = to_input_dev(cdev);
 823         int i = 0;
 824         int len = 0;
 825
 826         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
 827                                 dev->id.bustype, dev->id.vendor,
 828                                 dev->id.product, dev->id.version);
 829         if (dev->name)
 830                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
 831         if (dev->phys)
 832                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
 833         if (dev->uniq)
 834                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
 835
 836         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
 837         if (test_bit(EV_KEY, dev->evbit))
 838                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
 839         if (test_bit(EV_REL, dev->evbit))
 840                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
 841         if (test_bit(EV_ABS, dev->evbit))
 842                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
 843         if (test_bit(EV_MSC, dev->evbit))
 844                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
 845         if (test_bit(EV_LED, dev->evbit))
 846                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
 847         if (test_bit(EV_SND, dev->evbit))
 848                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
 849         if (test_bit(EV_FF, dev->evbit))
 850                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
 851         if (test_bit(EV_SW, dev->evbit))
 852                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
 853
 854         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
 855
 856         envp[i] = NULL;
 857         return 0;
 858 }
 859
 860 struct class input_class = {
 861         .name                   = "input",
 862         .release                = input_dev_release,
 863         .uevent                 = input_dev_uevent,
 864 };
 865
 866 struct input_dev *input_allocate_device(void)
 867 {
 868         struct input_dev *dev;
 869
 870         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
 871         if (dev) {
 872                 dev->dynalloc = 1;
 873                 dev->cdev.class = &input_class;
 874                 class_device_initialize(&dev->cdev);
 875                 INIT_LIST_HEAD(&dev->h_list);
 876                 INIT_LIST_HEAD(&dev->node);
 877         }
 878
 879         return dev;
 880 }
 881
 882 int input_register_device(struct input_dev *dev)
 883 {
 884         static atomic_t input_no = ATOMIC_INIT(0);
 885         struct input_handle *handle;
 886         struct input_handler *handler;
 887         struct input_device_id *id;
 888         const char *path;
 889         int error;
 890
 891         if (!dev->dynalloc) {
 892                 printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
 893                         "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n",
 894                         dev->name ? dev->name : "<Unknown>");
 895                 return -EINVAL;
 896         }
 897
 898         mutex_init(&dev->mutex);
 899         set_bit(EV_SYN, dev->evbit);
 900
 901         /*
 902          * If delay and period are pre-set by the driver, then autorepeating
 903          * is handled by the driver itself and we don't do it in input.c.
 904          */
 905
 906         init_timer(&dev->timer);
 907         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
 908                 dev->timer.data = (long) dev;
 909                 dev->timer.function = input_repeat_key;
 910                 dev->rep[REP_DELAY] = 250;
 911                 dev->rep[REP_PERIOD] = 33;
 912         }
 913
 914         INIT_LIST_HEAD(&dev->h_list);
 915         list_add_tail(&dev->node, &input_dev_list);
 916
 917         dev->cdev.class = &input_class;
 918         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
 919                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
 920
 921         error = class_device_add(&dev->cdev);
 922         if (error)
 923                 return error;
 924
 925         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
 926         if (error)
 927                 goto fail1;
 928
 929         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 930         if (error)
 931                 goto fail2;
 932
 933         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
 934         if (error)
 935                 goto fail3;
 936
 937         __module_get(THIS_MODULE);
 938
 939         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 940         printk(KERN_INFO "input: %s as %s\n",
 941                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
 942         kfree(path);
 943
 944         list_for_each_entry(handler, &input_handler_list, node)
 945                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 946                         if ((id = input_match_device(handler->id_table, dev)))
 947                                 if ((handle = handler->connect(handler, dev, id)))
 948                                         input_link_handle(handle);
 949
 950         input_wakeup_procfs_readers();
 951
 952         return 0;
 953
 954  fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 955  fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
 956  fail1: class_device_del(&dev->cdev);
 957         return error;
 958 }
 959
 960 void input_unregister_device(struct input_dev *dev)
 961 {
 962         struct list_head * node, * next;
 963
 964         if (!dev) return;
 965
 966         del_timer_sync(&dev->timer);
 967
 968         list_for_each_safe(node, next, &dev->h_list) {
 969                 struct input_handle * handle = to_handle(node);
 970                 list_del_init(&handle->d_node);
 971                 list_del_init(&handle->h_node);
 972                 handle->handler->disconnect(handle);
 973         }
 974
 975         list_del_init(&dev->node);
 976
 977         sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
 978         sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 979         sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
 980         class_device_unregister(&dev->cdev);
 981
 982         input_wakeup_procfs_readers();
 983 }
 984
 985 void input_register_handler(struct input_handler *handler)
 986 {
 987         struct input_dev *dev;
 988         struct input_handle *handle;
 989         struct input_device_id *id;
 990
 991         if (!handler) return;
 992
 993         INIT_LIST_HEAD(&handler->h_list);
 994
 995         if (handler->fops != NULL)
 996                 input_table[handler->minor >> 5] = handler;
 997
 998         list_add_tail(&handler->node, &input_handler_list);
 999
1000         list_for_each_entry(dev, &input_dev_list, node)
1001                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1002                         if ((id = input_match_device(handler->id_table, dev)))
1003                                 if ((handle = handler->connect(handler, dev, id)))
1004                                         input_link_handle(handle);
1005
1006         input_wakeup_procfs_readers();
1007 }
1008
1009 void input_unregister_handler(struct input_handler *handler)
1010 {
1011         struct list_head * node, * next;
1012
1013         list_for_each_safe(node, next, &handler->h_list) {
1014                 struct input_handle * handle = to_handle_h(node);
1015                 list_del_init(&handle->h_node);
1016                 list_del_init(&handle->d_node);
1017                 handler->disconnect(handle);
1018         }
1019
1020         list_del_init(&handler->node);
1021
1022         if (handler->fops != NULL)
1023                 input_table[handler->minor >> 5] = NULL;
1024
1025         input_wakeup_procfs_readers();
1026 }
1027
1028 static int input_open_file(struct inode *inode, struct file *file)
1029 {
1030         struct input_handler *handler = input_table[iminor(inode) >> 5];
1031         const struct file_operations *old_fops, *new_fops = NULL;
1032         int err;
1033
1034         /* No load-on-demand here? */
1035         if (!handler || !(new_fops = fops_get(handler->fops)))
1036                 return -ENODEV;
1037
1038         /*
1039          * That's _really_ odd. Usually NULL ->open means "nothing special",
1040          * not "no device". Oh, well...
1041          */
1042         if (!new_fops->open) {
1043                 fops_put(new_fops);
1044                 return -ENODEV;
1045         }
1046         old_fops = file->f_op;
1047         file->f_op = new_fops;
1048
1049         err = new_fops->open(inode, file);
1050
1051         if (err) {
1052                 fops_put(file->f_op);
1053                 file->f_op = fops_get(old_fops);
1054         }
1055         fops_put(old_fops);
1056         return err;
1057 }
1058
1059 static struct file_operations input_fops = {
1060         .owner = THIS_MODULE,
1061         .open = input_open_file,
1062 };
1063
1064 static int __init input_init(void)
1065 {
1066         int err;
1067
1068         err = class_register(&input_class);
1069         if (err) {
1070                 printk(KERN_ERR "input: unable to register input_dev class\n");
1071                 return err;
1072         }
1073
1074         err = input_proc_init();
1075         if (err)
1076                 goto fail1;
1077
1078         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1079         if (err) {
1080                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1081                 goto fail2;
1082         }
1083
1084         return 0;
1085
1086  fail2: input_proc_exit();
1087  fail1: class_unregister(&input_class);
1088         return err;
1089 }
1090
1091 static void __exit input_exit(void)
1092 {
1093         input_proc_exit();
1094         unregister_chrdev(INPUT_MAJOR, "input");
1095         class_unregister(&input_class);
1096 }
1097
1098 subsys_initcall(input_init);
1099 module_exit(input_exit);