git.oblomov.eu Git - 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 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  39 {
  40         struct input_handle *handle;
  41
  42         if (type > EV_MAX || !test_bit(type, dev->evbit))
  43                 return;
  44
  45         add_input_randomness(type, code, value);
  46
  47         switch (type) {
  48
  49                 case EV_SYN:
  50                         switch (code) {
  51                                 case SYN_CONFIG:
  52                                         if (dev->event)
  53                                                 dev->event(dev, type, code, value);
  54                                         break;
  55
  56                                 case SYN_REPORT:
  57                                         if (dev->sync)
  58                                                 return;
  59                                         dev->sync = 1;
  60                                         break;
  61                         }
  62                         break;
  63
  64                 case EV_KEY:
  65
  66                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
  67                                 return;
  68
  69                         if (value == 2)
  70                                 break;
  71
  72                         change_bit(code, dev->key);
  73
  74                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
  75                                 dev->repeat_key = code;
  76                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
  77                         }
  78
  79                         break;
  80
  81                 case EV_SW:
  82
  83                         if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
  84                                 return;
  85
  86                         change_bit(code, dev->sw);
  87
  88                         break;
  89
  90                 case EV_ABS:
  91
  92                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
  93                                 return;
  94
  95                         if (dev->absfuzz[code]) {
  96                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
  97                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
  98                                         return;
  99
 100                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
 101                                     (value < dev->abs[code] + dev->absfuzz[code]))
 102                                         value = (dev->abs[code] * 3 + value) >> 2;
 103
 104                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
 105                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
 106                                         value = (dev->abs[code] + value) >> 1;
 107                         }
 108
 109                         if (dev->abs[code] == value)
 110                                 return;
 111
 112                         dev->abs[code] = value;
 113                         break;
 114
 115                 case EV_REL:
 116
 117                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
 118                                 return;
 119
 120                         break;
 121
 122                 case EV_MSC:
 123
 124                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
 125                                 return;
 126
 127                         if (dev->event)
 128                                 dev->event(dev, type, code, value);
 129
 130                         break;
 131
 132                 case EV_LED:
 133
 134                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
 135                                 return;
 136
 137                         change_bit(code, dev->led);
 138
 139                         if (dev->event)
 140                                 dev->event(dev, type, code, value);
 141
 142                         break;
 143
 144                 case EV_SND:
 145
 146                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
 147                                 return;
 148
 149                         if (!!test_bit(code, dev->snd) != !!value)
 150                                 change_bit(code, dev->snd);
 151
 152                         if (dev->event)
 153                                 dev->event(dev, type, code, value);
 154
 155                         break;
 156
 157                 case EV_REP:
 158
 159                         if (code > REP_MAX || value < 0 || dev->rep[code] == value)
 160                                 return;
 161
 162                         dev->rep[code] = value;
 163                         if (dev->event)
 164                                 dev->event(dev, type, code, value);
 165
 166                         break;
 167
 168                 case EV_FF:
 169                         if (dev->event)
 170                                 dev->event(dev, type, code, value);
 171                         break;
 172         }
 173
 174         if (type != EV_SYN)
 175                 dev->sync = 0;
 176
 177         if (dev->grab)
 178                 dev->grab->handler->event(dev->grab, type, code, value);
 179         else
 180                 list_for_each_entry(handle, &dev->h_list, d_node)
 181                         if (handle->open)
 182                                 handle->handler->event(handle, type, code, value);
 183 }
 184 EXPORT_SYMBOL(input_event);
 185
 186 static void input_repeat_key(unsigned long data)
 187 {
 188         struct input_dev *dev = (void *) data;
 189
 190         if (!test_bit(dev->repeat_key, dev->key))
 191                 return;
 192
 193         input_event(dev, EV_KEY, dev->repeat_key, 2);
 194         input_sync(dev);
 195
 196         if (dev->rep[REP_PERIOD])
 197                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
 198 }
 199
 200 int input_accept_process(struct input_handle *handle, struct file *file)
 201 {
 202         if (handle->dev->accept)
 203                 return handle->dev->accept(handle->dev, file);
 204
 205         return 0;
 206 }
 207 EXPORT_SYMBOL(input_accept_process);
 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 EXPORT_SYMBOL(input_grab_device);
 218
 219 void input_release_device(struct input_handle *handle)
 220 {
 221         if (handle->dev->grab == handle)
 222                 handle->dev->grab = NULL;
 223 }
 224 EXPORT_SYMBOL(input_release_device);
 225
 226 int input_open_device(struct input_handle *handle)
 227 {
 228         struct input_dev *dev = handle->dev;
 229         int err;
 230
 231         err = mutex_lock_interruptible(&dev->mutex);
 232         if (err)
 233                 return err;
 234
 235         handle->open++;
 236
 237         if (!dev->users++ && dev->open)
 238                 err = dev->open(dev);
 239
 240         if (err)
 241                 handle->open--;
 242
 243         mutex_unlock(&dev->mutex);
 244
 245         return err;
 246 }
 247 EXPORT_SYMBOL(input_open_device);
 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 EXPORT_SYMBOL(input_flush_device);
 257
 258 void input_close_device(struct input_handle *handle)
 259 {
 260         struct input_dev *dev = handle->dev;
 261
 262         input_release_device(handle);
 263
 264         mutex_lock(&dev->mutex);
 265
 266         if (!--dev->users && dev->close)
 267                 dev->close(dev);
 268         handle->open--;
 269
 270         mutex_unlock(&dev->mutex);
 271 }
 272 EXPORT_SYMBOL(input_close_device);
 273
 274 static void input_link_handle(struct input_handle *handle)
 275 {
 276         list_add_tail(&handle->d_node, &handle->dev->h_list);
 277         list_add_tail(&handle->h_node, &handle->handler->h_list);
 278 }
 279
 280 #define MATCH_BIT(bit, max) \
 281                 for (i = 0; i < NBITS(max); i++) \
 282                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
 283                                 break; \
 284                 if (i != NBITS(max)) \
 285                         continue;
 286
 287 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
 288 {
 289         int i;
 290
 291         for (; id->flags || id->driver_info; id++) {
 292
 293                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 294                         if (id->bustype != dev->id.bustype)
 295                                 continue;
 296
 297                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 298                         if (id->vendor != dev->id.vendor)
 299                                 continue;
 300
 301                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 302                         if (id->product != dev->id.product)
 303                                 continue;
 304
 305                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 306                         if (id->version != dev->id.version)
 307                                 continue;
 308
 309                 MATCH_BIT(evbit,  EV_MAX);
 310                 MATCH_BIT(keybit, KEY_MAX);
 311                 MATCH_BIT(relbit, REL_MAX);
 312                 MATCH_BIT(absbit, ABS_MAX);
 313                 MATCH_BIT(mscbit, MSC_MAX);
 314                 MATCH_BIT(ledbit, LED_MAX);
 315                 MATCH_BIT(sndbit, SND_MAX);
 316                 MATCH_BIT(ffbit,  FF_MAX);
 317                 MATCH_BIT(swbit,  SW_MAX);
 318
 319                 return id;
 320         }
 321
 322         return NULL;
 323 }
 324
 325 #ifdef CONFIG_PROC_FS
 326
 327 static struct proc_dir_entry *proc_bus_input_dir;
 328 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
 329 static int input_devices_state;
 330
 331 static inline void input_wakeup_procfs_readers(void)
 332 {
 333         input_devices_state++;
 334         wake_up(&input_devices_poll_wait);
 335 }
 336
 337 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
 338 {
 339         int state = input_devices_state;
 340
 341         poll_wait(file, &input_devices_poll_wait, wait);
 342         if (state != input_devices_state)
 343                 return POLLIN | POLLRDNORM;
 344
 345         return 0;
 346 }
 347
 348 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
 349 {
 350         struct list_head *node;
 351         loff_t i = 0;
 352
 353         list_for_each(node, list)
 354                 if (i++ == *pos)
 355                         return node;
 356
 357         return NULL;
 358 }
 359
 360 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
 361 {
 362         if (element->next == list)
 363                 return NULL;
 364
 365         ++(*pos);
 366         return element->next;
 367 }
 368
 369 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
 370 {
 371         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 372
 373         return list_get_nth_element(&input_dev_list, pos);
 374 }
 375
 376 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 377 {
 378         return list_get_next_element(&input_dev_list, v, pos);
 379 }
 380
 381 static void input_devices_seq_stop(struct seq_file *seq, void *v)
 382 {
 383         /* release lock here */
 384 }
 385
 386 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
 387                                    unsigned long *bitmap, int max)
 388 {
 389         int i;
 390
 391         for (i = NBITS(max) - 1; i > 0; i--)
 392                 if (bitmap[i])
 393                         break;
 394
 395         seq_printf(seq, "B: %s=", name);
 396         for (; i >= 0; i--)
 397                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
 398         seq_putc(seq, '\n');
 399 }
 400
 401 static int input_devices_seq_show(struct seq_file *seq, void *v)
 402 {
 403         struct input_dev *dev = container_of(v, struct input_dev, node);
 404         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 405         struct input_handle *handle;
 406
 407         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 408                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 409
 410         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 411         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 412         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
 413         seq_printf(seq, "H: Handlers=");
 414
 415         list_for_each_entry(handle, &dev->h_list, d_node)
 416                 seq_printf(seq, "%s ", handle->name);
 417         seq_putc(seq, '\n');
 418
 419         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
 420         if (test_bit(EV_KEY, dev->evbit))
 421                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
 422         if (test_bit(EV_REL, dev->evbit))
 423                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
 424         if (test_bit(EV_ABS, dev->evbit))
 425                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
 426         if (test_bit(EV_MSC, dev->evbit))
 427                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
 428         if (test_bit(EV_LED, dev->evbit))
 429                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
 430         if (test_bit(EV_SND, dev->evbit))
 431                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
 432         if (test_bit(EV_FF, dev->evbit))
 433                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
 434         if (test_bit(EV_SW, dev->evbit))
 435                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
 436
 437         seq_putc(seq, '\n');
 438
 439         kfree(path);
 440         return 0;
 441 }
 442
 443 static struct seq_operations input_devices_seq_ops = {
 444         .start  = input_devices_seq_start,
 445         .next   = input_devices_seq_next,
 446         .stop   = input_devices_seq_stop,
 447         .show   = input_devices_seq_show,
 448 };
 449
 450 static int input_proc_devices_open(struct inode *inode, struct file *file)
 451 {
 452         return seq_open(file, &input_devices_seq_ops);
 453 }
 454
 455 static struct file_operations input_devices_fileops = {
 456         .owner          = THIS_MODULE,
 457         .open           = input_proc_devices_open,
 458         .poll           = input_proc_devices_poll,
 459         .read           = seq_read,
 460         .llseek         = seq_lseek,
 461         .release        = seq_release,
 462 };
 463
 464 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
 465 {
 466         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 467         seq->private = (void *)(unsigned long)*pos;
 468         return list_get_nth_element(&input_handler_list, pos);
 469 }
 470
 471 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 472 {
 473         seq->private = (void *)(unsigned long)(*pos + 1);
 474         return list_get_next_element(&input_handler_list, v, pos);
 475 }
 476
 477 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
 478 {
 479         /* release lock here */
 480 }
 481
 482 static int input_handlers_seq_show(struct seq_file *seq, void *v)
 483 {
 484         struct input_handler *handler = container_of(v, struct input_handler, node);
 485
 486         seq_printf(seq, "N: Number=%ld Name=%s",
 487                    (unsigned long)seq->private, handler->name);
 488         if (handler->fops)
 489                 seq_printf(seq, " Minor=%d", handler->minor);
 490         seq_putc(seq, '\n');
 491
 492         return 0;
 493 }
 494 static struct seq_operations input_handlers_seq_ops = {
 495         .start  = input_handlers_seq_start,
 496         .next   = input_handlers_seq_next,
 497         .stop   = input_handlers_seq_stop,
 498         .show   = input_handlers_seq_show,
 499 };
 500
 501 static int input_proc_handlers_open(struct inode *inode, struct file *file)
 502 {
 503         return seq_open(file, &input_handlers_seq_ops);
 504 }
 505
 506 static struct file_operations input_handlers_fileops = {
 507         .owner          = THIS_MODULE,
 508         .open           = input_proc_handlers_open,
 509         .read           = seq_read,
 510         .llseek         = seq_lseek,
 511         .release        = seq_release,
 512 };
 513
 514 static int __init input_proc_init(void)
 515 {
 516         struct proc_dir_entry *entry;
 517
 518         proc_bus_input_dir = proc_mkdir("input", proc_bus);
 519         if (!proc_bus_input_dir)
 520                 return -ENOMEM;
 521
 522         proc_bus_input_dir->owner = THIS_MODULE;
 523
 524         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
 525         if (!entry)
 526                 goto fail1;
 527
 528         entry->owner = THIS_MODULE;
 529         entry->proc_fops = &input_devices_fileops;
 530
 531         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
 532         if (!entry)
 533                 goto fail2;
 534
 535         entry->owner = THIS_MODULE;
 536         entry->proc_fops = &input_handlers_fileops;
 537
 538         return 0;
 539
 540  fail2: remove_proc_entry("devices", proc_bus_input_dir);
 541  fail1: remove_proc_entry("input", proc_bus);
 542         return -ENOMEM;
 543 }
 544
 545 static void input_proc_exit(void)
 546 {
 547         remove_proc_entry("devices", proc_bus_input_dir);
 548         remove_proc_entry("handlers", proc_bus_input_dir);
 549         remove_proc_entry("input", proc_bus);
 550 }
 551
 552 #else /* !CONFIG_PROC_FS */
 553 static inline void input_wakeup_procfs_readers(void) { }
 554 static inline int input_proc_init(void) { return 0; }
 555 static inline void input_proc_exit(void) { }
 556 #endif
 557
 558 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
 559 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
 560 {                                                                               \
 561         struct input_dev *input_dev = to_input_dev(dev);                        \
 562         int retval;                                                             \
 563                                                                                 \
 564         retval = mutex_lock_interruptible(&input_dev->mutex);                   \
 565         if (retval)                                                             \
 566                 return retval;                                                  \
 567                                                                                 \
 568         retval = scnprintf(buf, PAGE_SIZE,                                      \
 569                            "%s\n", input_dev->name ? input_dev->name : "");     \
 570                                                                                 \
 571         mutex_unlock(&input_dev->mutex);                                        \
 572                                                                                 \
 573         return retval;                                                          \
 574 }                                                                               \
 575 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
 576
 577 INPUT_DEV_STRING_ATTR_SHOW(name);
 578 INPUT_DEV_STRING_ATTR_SHOW(phys);
 579 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 580
 581 static int input_print_modalias_bits(char *buf, int size,
 582                                      char name, unsigned long *bm,
 583                                      unsigned int min_bit, unsigned int max_bit)
 584 {
 585         int len = 0, i;
 586
 587         len += snprintf(buf, max(size, 0), "%c", name);
 588         for (i = min_bit; i < max_bit; i++)
 589                 if (bm[LONG(i)] & BIT(i))
 590                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
 591         return len;
 592 }
 593
 594 static int input_print_modalias(char *buf, int size, struct input_dev *id,
 595                                 int add_cr)
 596 {
 597         int len;
 598
 599         len = snprintf(buf, max(size, 0),
 600                        "input:b%04Xv%04Xp%04Xe%04X-",
 601                        id->id.bustype, id->id.vendor,
 602                        id->id.product, id->id.version);
 603
 604         len += input_print_modalias_bits(buf + len, size - len,
 605                                 'e', id->evbit, 0, EV_MAX);
 606         len += input_print_modalias_bits(buf + len, size - len,
 607                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
 608         len += input_print_modalias_bits(buf + len, size - len,
 609                                 'r', id->relbit, 0, REL_MAX);
 610         len += input_print_modalias_bits(buf + len, size - len,
 611                                 'a', id->absbit, 0, ABS_MAX);
 612         len += input_print_modalias_bits(buf + len, size - len,
 613                                 'm', id->mscbit, 0, MSC_MAX);
 614         len += input_print_modalias_bits(buf + len, size - len,
 615                                 'l', id->ledbit, 0, LED_MAX);
 616         len += input_print_modalias_bits(buf + len, size - len,
 617                                 's', id->sndbit, 0, SND_MAX);
 618         len += input_print_modalias_bits(buf + len, size - len,
 619                                 'f', id->ffbit, 0, FF_MAX);
 620         len += input_print_modalias_bits(buf + len, size - len,
 621                                 'w', id->swbit, 0, SW_MAX);
 622
 623         if (add_cr)
 624                 len += snprintf(buf + len, max(size - len, 0), "\n");
 625
 626         return len;
 627 }
 628
 629 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
 630 {
 631         struct input_dev *id = to_input_dev(dev);
 632         ssize_t len;
 633
 634         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
 635
 636         return min_t(int, len, PAGE_SIZE);
 637 }
 638 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 639
 640 static struct attribute *input_dev_attrs[] = {
 641         &class_device_attr_name.attr,
 642         &class_device_attr_phys.attr,
 643         &class_device_attr_uniq.attr,
 644         &class_device_attr_modalias.attr,
 645         NULL
 646 };
 647
 648 static struct attribute_group input_dev_attr_group = {
 649         .attrs  = input_dev_attrs,
 650 };
 651
 652 #define INPUT_DEV_ID_ATTR(name)                                                 \
 653 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
 654 {                                                                               \
 655         struct input_dev *input_dev = to_input_dev(dev);                        \
 656         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
 657 }                                                                               \
 658 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
 659
 660 INPUT_DEV_ID_ATTR(bustype);
 661 INPUT_DEV_ID_ATTR(vendor);
 662 INPUT_DEV_ID_ATTR(product);
 663 INPUT_DEV_ID_ATTR(version);
 664
 665 static struct attribute *input_dev_id_attrs[] = {
 666         &class_device_attr_bustype.attr,
 667         &class_device_attr_vendor.attr,
 668         &class_device_attr_product.attr,
 669         &class_device_attr_version.attr,
 670         NULL
 671 };
 672
 673 static struct attribute_group input_dev_id_attr_group = {
 674         .name   = "id",
 675         .attrs  = input_dev_id_attrs,
 676 };
 677
 678 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
 679                               int max, int add_cr)
 680 {
 681         int i;
 682         int len = 0;
 683
 684         for (i = NBITS(max) - 1; i > 0; i--)
 685                 if (bitmap[i])
 686                         break;
 687
 688         for (; i >= 0; i--)
 689                 len += snprintf(buf + len, max(buf_size - len, 0),
 690                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
 691
 692         if (add_cr)
 693                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
 694
 695         return len;
 696 }
 697
 698 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
 699 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
 700 {                                                                               \
 701         struct input_dev *input_dev = to_input_dev(dev);                        \
 702         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
 703                                      input_dev->bm##bit, ev##_MAX, 1);          \
 704         return min_t(int, len, PAGE_SIZE);                                      \
 705 }                                                                               \
 706 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
 707
 708 INPUT_DEV_CAP_ATTR(EV, ev);
 709 INPUT_DEV_CAP_ATTR(KEY, key);
 710 INPUT_DEV_CAP_ATTR(REL, rel);
 711 INPUT_DEV_CAP_ATTR(ABS, abs);
 712 INPUT_DEV_CAP_ATTR(MSC, msc);
 713 INPUT_DEV_CAP_ATTR(LED, led);
 714 INPUT_DEV_CAP_ATTR(SND, snd);
 715 INPUT_DEV_CAP_ATTR(FF, ff);
 716 INPUT_DEV_CAP_ATTR(SW, sw);
 717
 718 static struct attribute *input_dev_caps_attrs[] = {
 719         &class_device_attr_ev.attr,
 720         &class_device_attr_key.attr,
 721         &class_device_attr_rel.attr,
 722         &class_device_attr_abs.attr,
 723         &class_device_attr_msc.attr,
 724         &class_device_attr_led.attr,
 725         &class_device_attr_snd.attr,
 726         &class_device_attr_ff.attr,
 727         &class_device_attr_sw.attr,
 728         NULL
 729 };
 730
 731 static struct attribute_group input_dev_caps_attr_group = {
 732         .name   = "capabilities",
 733         .attrs  = input_dev_caps_attrs,
 734 };
 735
 736 static void input_dev_release(struct class_device *class_dev)
 737 {
 738         struct input_dev *dev = to_input_dev(class_dev);
 739
 740         kfree(dev);
 741         module_put(THIS_MODULE);
 742 }
 743
 744 /*
 745  * Input uevent interface - loading event handlers based on
 746  * device bitfields.
 747  */
 748 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
 749                                    char *buffer, int buffer_size, int *cur_len,
 750                                    const char *name, unsigned long *bitmap, int max)
 751 {
 752         if (*cur_index >= num_envp - 1)
 753                 return -ENOMEM;
 754
 755         envp[*cur_index] = buffer + *cur_len;
 756
 757         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
 758         if (*cur_len >= buffer_size)
 759                 return -ENOMEM;
 760
 761         *cur_len += input_print_bitmap(buffer + *cur_len,
 762                                         max(buffer_size - *cur_len, 0),
 763                                         bitmap, max, 0) + 1;
 764         if (*cur_len > buffer_size)
 765                 return -ENOMEM;
 766
 767         (*cur_index)++;
 768         return 0;
 769 }
 770
 771 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
 772                                          char *buffer, int buffer_size, int *cur_len,
 773                                          struct input_dev *dev)
 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),
 781                              "MODALIAS=");
 782         if (*cur_len >= buffer_size)
 783                 return -ENOMEM;
 784
 785         *cur_len += input_print_modalias(buffer + *cur_len,
 786                                          max(buffer_size - *cur_len, 0),
 787                                          dev, 0) + 1;
 788         if (*cur_len > buffer_size)
 789                 return -ENOMEM;
 790
 791         (*cur_index)++;
 792         return 0;
 793 }
 794
 795 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
 796         do {                                                            \
 797                 int err = add_uevent_var(envp, num_envp, &i,            \
 798                                         buffer, buffer_size, &len,      \
 799                                         fmt, val);                      \
 800                 if (err)                                                \
 801                         return err;                                     \
 802         } while (0)
 803
 804 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
 805         do {                                                            \
 806                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
 807                                         buffer, buffer_size, &len,      \
 808                                         name, bm, max);                 \
 809                 if (err)                                                \
 810                         return err;                                     \
 811         } while (0)
 812
 813 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
 814         do {                                                            \
 815                 int err = input_add_uevent_modalias_var(envp,           \
 816                                         num_envp, &i,                   \
 817                                         buffer, buffer_size, &len,      \
 818                                         dev);                           \
 819                 if (err)                                                \
 820                         return err;                                     \
 821         } while (0)
 822
 823 static int input_dev_uevent(struct class_device *cdev, char **envp,
 824                             int num_envp, char *buffer, int buffer_size)
 825 {
 826         struct input_dev *dev = to_input_dev(cdev);
 827         int i = 0;
 828         int len = 0;
 829
 830         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
 831                                 dev->id.bustype, dev->id.vendor,
 832                                 dev->id.product, dev->id.version);
 833         if (dev->name)
 834                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
 835         if (dev->phys)
 836                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
 837         if (dev->uniq)
 838                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
 839
 840         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
 841         if (test_bit(EV_KEY, dev->evbit))
 842                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
 843         if (test_bit(EV_REL, dev->evbit))
 844                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
 845         if (test_bit(EV_ABS, dev->evbit))
 846                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
 847         if (test_bit(EV_MSC, dev->evbit))
 848                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
 849         if (test_bit(EV_LED, dev->evbit))
 850                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
 851         if (test_bit(EV_SND, dev->evbit))
 852                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
 853         if (test_bit(EV_FF, dev->evbit))
 854                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
 855         if (test_bit(EV_SW, dev->evbit))
 856                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
 857
 858         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
 859
 860         envp[i] = NULL;
 861         return 0;
 862 }
 863
 864 struct class input_class = {
 865         .name                   = "input",
 866         .release                = input_dev_release,
 867         .uevent                 = input_dev_uevent,
 868 };
 869 EXPORT_SYMBOL_GPL(input_class);
 870
 871 struct input_dev *input_allocate_device(void)
 872 {
 873         struct input_dev *dev;
 874
 875         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
 876         if (dev) {
 877                 dev->dynalloc = 1;
 878                 dev->cdev.class = &input_class;
 879                 class_device_initialize(&dev->cdev);
 880                 mutex_init(&dev->mutex);
 881                 INIT_LIST_HEAD(&dev->h_list);
 882                 INIT_LIST_HEAD(&dev->node);
 883         }
 884
 885         return dev;
 886 }
 887 EXPORT_SYMBOL(input_allocate_device);
 888
 889 void input_free_device(struct input_dev *dev)
 890 {
 891         if (dev) {
 892
 893                 mutex_lock(&dev->mutex);
 894                 dev->name = dev->phys = dev->uniq = NULL;
 895                 mutex_unlock(&dev->mutex);
 896
 897                 input_put_device(dev);
 898         }
 899 }
 900 EXPORT_SYMBOL(input_free_device);
 901
 902 int input_register_device(struct input_dev *dev)
 903 {
 904         static atomic_t input_no = ATOMIC_INIT(0);
 905         struct input_handle *handle;
 906         struct input_handler *handler;
 907         struct input_device_id *id;
 908         const char *path;
 909         int error;
 910
 911         if (!dev->dynalloc) {
 912                 printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
 913                         "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n",
 914                         dev->name ? dev->name : "<Unknown>");
 915                 return -EINVAL;
 916         }
 917
 918         set_bit(EV_SYN, dev->evbit);
 919
 920         /*
 921          * If delay and period are pre-set by the driver, then autorepeating
 922          * is handled by the driver itself and we don't do it in input.c.
 923          */
 924
 925         init_timer(&dev->timer);
 926         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
 927                 dev->timer.data = (long) dev;
 928                 dev->timer.function = input_repeat_key;
 929                 dev->rep[REP_DELAY] = 250;
 930                 dev->rep[REP_PERIOD] = 33;
 931         }
 932
 933         INIT_LIST_HEAD(&dev->h_list);
 934         list_add_tail(&dev->node, &input_dev_list);
 935
 936         dev->cdev.class = &input_class;
 937         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
 938                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
 939
 940         error = class_device_add(&dev->cdev);
 941         if (error)
 942                 return error;
 943
 944         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
 945         if (error)
 946                 goto fail1;
 947
 948         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 949         if (error)
 950                 goto fail2;
 951
 952         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
 953         if (error)
 954                 goto fail3;
 955
 956         __module_get(THIS_MODULE);
 957
 958         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 959         printk(KERN_INFO "input: %s as %s\n",
 960                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
 961         kfree(path);
 962
 963         list_for_each_entry(handler, &input_handler_list, node)
 964                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 965                         if ((id = input_match_device(handler->id_table, dev)))
 966                                 if ((handle = handler->connect(handler, dev, id)))
 967                                         input_link_handle(handle);
 968
 969         input_wakeup_procfs_readers();
 970
 971         return 0;
 972
 973  fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 974  fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
 975  fail1: class_device_del(&dev->cdev);
 976         return error;
 977 }
 978 EXPORT_SYMBOL(input_register_device);
 979
 980 void input_unregister_device(struct input_dev *dev)
 981 {
 982         struct list_head *node, *next;
 983
 984         if (!dev)
 985                 return;
 986
 987         del_timer_sync(&dev->timer);
 988
 989         list_for_each_safe(node, next, &dev->h_list) {
 990                 struct input_handle * handle = to_handle(node);
 991                 list_del_init(&handle->d_node);
 992                 list_del_init(&handle->h_node);
 993                 handle->handler->disconnect(handle);
 994         }
 995
 996         list_del_init(&dev->node);
 997
 998         sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
 999         sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1000         sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1001         class_device_unregister(&dev->cdev);
1002
1003         mutex_lock(&dev->mutex);
1004         dev->name = dev->phys = dev->uniq = NULL;
1005         mutex_unlock(&dev->mutex);
1006
1007         input_wakeup_procfs_readers();
1008 }
1009 EXPORT_SYMBOL(input_unregister_device);
1010
1011 void input_register_handler(struct input_handler *handler)
1012 {
1013         struct input_dev *dev;
1014         struct input_handle *handle;
1015         struct input_device_id *id;
1016
1017         if (!handler)
1018                 return;
1019
1020         INIT_LIST_HEAD(&handler->h_list);
1021
1022         if (handler->fops != NULL)
1023                 input_table[handler->minor >> 5] = handler;
1024
1025         list_add_tail(&handler->node, &input_handler_list);
1026
1027         list_for_each_entry(dev, &input_dev_list, node)
1028                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1029                         if ((id = input_match_device(handler->id_table, dev)))
1030                                 if ((handle = handler->connect(handler, dev, id)))
1031                                         input_link_handle(handle);
1032
1033         input_wakeup_procfs_readers();
1034 }
1035 EXPORT_SYMBOL(input_register_handler);
1036
1037 void input_unregister_handler(struct input_handler *handler)
1038 {
1039         struct list_head *node, *next;
1040
1041         list_for_each_safe(node, next, &handler->h_list) {
1042                 struct input_handle * handle = to_handle_h(node);
1043                 list_del_init(&handle->h_node);
1044                 list_del_init(&handle->d_node);
1045                 handler->disconnect(handle);
1046         }
1047
1048         list_del_init(&handler->node);
1049
1050         if (handler->fops != NULL)
1051                 input_table[handler->minor >> 5] = NULL;
1052
1053         input_wakeup_procfs_readers();
1054 }
1055 EXPORT_SYMBOL(input_unregister_handler);
1056
1057 static int input_open_file(struct inode *inode, struct file *file)
1058 {
1059         struct input_handler *handler = input_table[iminor(inode) >> 5];
1060         const struct file_operations *old_fops, *new_fops = NULL;
1061         int err;
1062
1063         /* No load-on-demand here? */
1064         if (!handler || !(new_fops = fops_get(handler->fops)))
1065                 return -ENODEV;
1066
1067         /*
1068          * That's _really_ odd. Usually NULL ->open means "nothing special",
1069          * not "no device". Oh, well...
1070          */
1071         if (!new_fops->open) {
1072                 fops_put(new_fops);
1073                 return -ENODEV;
1074         }
1075         old_fops = file->f_op;
1076         file->f_op = new_fops;
1077
1078         err = new_fops->open(inode, file);
1079
1080         if (err) {
1081                 fops_put(file->f_op);
1082                 file->f_op = fops_get(old_fops);
1083         }
1084         fops_put(old_fops);
1085         return err;
1086 }
1087
1088 static struct file_operations input_fops = {
1089         .owner = THIS_MODULE,
1090         .open = input_open_file,
1091 };
1092
1093 static int __init input_init(void)
1094 {
1095         int err;
1096
1097         err = class_register(&input_class);
1098         if (err) {
1099                 printk(KERN_ERR "input: unable to register input_dev class\n");
1100                 return err;
1101         }
1102
1103         err = input_proc_init();
1104         if (err)
1105                 goto fail1;
1106
1107         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1108         if (err) {
1109                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1110                 goto fail2;
1111         }
1112
1113         return 0;
1114
1115  fail2: input_proc_exit();
1116  fail1: class_unregister(&input_class);
1117         return err;
1118 }
1119
1120 static void __exit input_exit(void)
1121 {
1122         input_proc_exit();
1123         unregister_chrdev(INPUT_MAJOR, "input");
1124         class_unregister(&input_class);
1125 }
1126
1127 subsys_initcall(input_init);
1128 module_exit(input_exit);