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