SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/input/input.c

   1 /*
   2  * The input core
   3  *
   4  * Copyright (c) 1999-2002 Vojtech Pavlik
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published by
  10  * the Free Software Foundation.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/sched.h>
  15 #include <linux/smp_lock.h>
  16 #include <linux/input.h>
  17 #include <linux/module.h>
  18 #include <linux/random.h>
  19 #include <linux/major.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/kobject_uevent.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/poll.h>
  24 #include <linux/device.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(input_class);
  43 EXPORT_SYMBOL_GPL(input_dev_class);
  44
  45 #define INPUT_DEVICES   256
  46
  47 static LIST_HEAD(input_dev_list);
  48 static LIST_HEAD(input_handler_list);
  49
  50 static struct input_handler *input_table[8];
  51
  52 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  53 {
  54         struct input_handle *handle;
  55
  56         if (type > EV_MAX || !test_bit(type, dev->evbit))
  57                 return;
  58
  59         add_input_randomness(type, code, value);
  60
  61         switch (type) {
  62
  63                 case EV_SYN:
  64                         switch (code) {
  65                                 case SYN_CONFIG:
  66                                         if (dev->event) dev->event(dev, type, code, value);
  67                                         break;
  68
  69                                 case SYN_REPORT:
  70                                         if (dev->sync) return;
  71                                         dev->sync = 1;
  72                                         break;
  73                         }
  74                         break;
  75
  76                 case EV_KEY:
  77
  78                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
  79                                 return;
  80
  81                         if (value == 2)
  82                                 break;
  83
  84                         change_bit(code, dev->key);
  85
  86                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
  87                                 dev->repeat_key = code;
  88                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
  89                         }
  90
  91                         break;
  92
  93                 case EV_SW:
  94
  95                         if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
  96                                 return;
  97
  98                         change_bit(code, dev->sw);
  99
 100                         break;
 101
 102                 case EV_ABS:
 103
 104                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
 105                                 return;
 106
 107                         if (dev->absfuzz[code]) {
 108                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
 109                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
 110                                         return;
 111
 112                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
 113                                     (value < dev->abs[code] + dev->absfuzz[code]))
 114                                         value = (dev->abs[code] * 3 + value) >> 2;
 115
 116                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
 117                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
 118                                         value = (dev->abs[code] + value) >> 1;
 119                         }
 120
 121                         if (dev->abs[code] == value)
 122                                 return;
 123
 124                         dev->abs[code] = value;
 125                         break;
 126
 127                 case EV_REL:
 128
 129                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
 130                                 return;
 131
 132                         break;
 133
 134                 case EV_MSC:
 135
 136                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
 137                                 return;
 138
 139                         if (dev->event) dev->event(dev, type, code, value);
 140
 141                         break;
 142
 143                 case EV_LED:
 144
 145                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
 146                                 return;
 147
 148                         change_bit(code, dev->led);
 149                         if (dev->event) dev->event(dev, type, code, value);
 150
 151                         break;
 152
 153                 case EV_SND:
 154
 155                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
 156                                 return;
 157
 158                         if (dev->event) dev->event(dev, type, code, value);
 159
 160                         break;
 161
 162                 case EV_REP:
 163
 164                         if (code > REP_MAX || value < 0 || dev->rep[code] == value) return;
 165
 166                         dev->rep[code] = value;
 167                         if (dev->event) dev->event(dev, type, code, value);
 168
 169                         break;
 170
 171                 case EV_FF:
 172                         if (dev->event) dev->event(dev, type, code, value);
 173                         break;
 174         }
 175
 176         if (type != EV_SYN)
 177                 dev->sync = 0;
 178
 179         if (dev->grab)
 180                 dev->grab->handler->event(dev->grab, type, code, value);
 181         else
 182                 list_for_each_entry(handle, &dev->h_list, d_node)
 183                         if (handle->open)
 184                                 handle->handler->event(handle, type, code, value);
 185 }
 186
 187 static void input_repeat_key(unsigned long data)
 188 {
 189         struct input_dev *dev = (void *) data;
 190
 191         if (!test_bit(dev->repeat_key, dev->key))
 192                 return;
 193
 194         input_event(dev, EV_KEY, dev->repeat_key, 2);
 195         input_sync(dev);
 196
 197         if (dev->rep[REP_PERIOD])
 198                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
 199 }
 200
 201 int input_accept_process(struct input_handle *handle, struct file *file)
 202 {
 203         if (handle->dev->accept)
 204                 return handle->dev->accept(handle->dev, file);
 205
 206         return 0;
 207 }
 208
 209 int input_grab_device(struct input_handle *handle)
 210 {
 211         if (handle->dev->grab)
 212                 return -EBUSY;
 213
 214         handle->dev->grab = handle;
 215         return 0;
 216 }
 217
 218 void input_release_device(struct input_handle *handle)
 219 {
 220         if (handle->dev->grab == handle)
 221                 handle->dev->grab = NULL;
 222 }
 223
 224 int input_open_device(struct input_handle *handle)
 225 {
 226         struct input_dev *dev = handle->dev;
 227         int err;
 228
 229         err = down_interruptible(&dev->sem);
 230         if (err)
 231                 return err;
 232
 233         handle->open++;
 234
 235         if (!dev->users++ && dev->open)
 236                 err = dev->open(dev);
 237
 238         if (err)
 239                 handle->open--;
 240
 241         up(&dev->sem);
 242
 243         return err;
 244 }
 245
 246 int input_flush_device(struct input_handle* handle, struct file* file)
 247 {
 248         if (handle->dev->flush)
 249                 return handle->dev->flush(handle->dev, file);
 250
 251         return 0;
 252 }
 253
 254 void input_close_device(struct input_handle *handle)
 255 {
 256         struct input_dev *dev = handle->dev;
 257
 258         input_release_device(handle);
 259
 260         down(&dev->sem);
 261
 262         if (!--dev->users && dev->close)
 263                 dev->close(dev);
 264         handle->open--;
 265
 266         up(&dev->sem);
 267 }
 268
 269 static void input_link_handle(struct input_handle *handle)
 270 {
 271         list_add_tail(&handle->d_node, &handle->dev->h_list);
 272         list_add_tail(&handle->h_node, &handle->handler->h_list);
 273 }
 274
 275 #define MATCH_BIT(bit, max) \
 276                 for (i = 0; i < NBITS(max); i++) \
 277                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
 278                                 break; \
 279                 if (i != NBITS(max)) \
 280                         continue;
 281
 282 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
 283 {
 284         int i;
 285
 286         for (; id->flags || id->driver_info; id++) {
 287
 288                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 289                         if (id->id.bustype != dev->id.bustype)
 290                                 continue;
 291
 292                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 293                         if (id->id.vendor != dev->id.vendor)
 294                                 continue;
 295
 296                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 297                         if (id->id.product != dev->id.product)
 298                                 continue;
 299
 300                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 301                         if (id->id.version != dev->id.version)
 302                                 continue;
 303
 304                 MATCH_BIT(evbit,  EV_MAX);
 305                 MATCH_BIT(keybit, KEY_MAX);
 306                 MATCH_BIT(relbit, REL_MAX);
 307                 MATCH_BIT(absbit, ABS_MAX);
 308                 MATCH_BIT(mscbit, MSC_MAX);
 309                 MATCH_BIT(ledbit, LED_MAX);
 310                 MATCH_BIT(sndbit, SND_MAX);
 311                 MATCH_BIT(ffbit,  FF_MAX);
 312                 MATCH_BIT(swbit,  SW_MAX);
 313
 314                 return id;
 315         }
 316
 317         return NULL;
 318 }
 319
 320
 321 /*
 322  * Input hotplugging interface - loading event handlers based on
 323  * device bitfields.
 324  */
 325
 326 #ifdef CONFIG_HOTPLUG
 327
 328 /*
 329  * Input hotplugging invokes what /proc/sys/kernel/hotplug says
 330  * (normally /sbin/hotplug) when input devices get added or removed.
 331  *
 332  * This invokes a user mode policy agent, typically helping to load driver
 333  * or other modules, configure the device, and more.  Drivers can provide
 334  * a MODULE_DEVICE_TABLE to help with module loading subtasks.
 335  *
 336  */
 337
 338 #define SPRINTF_BIT_A(bit, name, max) \
 339         do { \
 340                 envp[i++] = scratch; \
 341                 scratch += sprintf(scratch, name); \
 342                 for (j = NBITS(max) - 1; j >= 0; j--) \
 343                         if (dev->bit[j]) break; \
 344                 for (; j >= 0; j--) \
 345                         scratch += sprintf(scratch, "%lx ", dev->bit[j]); \
 346                 scratch++; \
 347         } while (0)
 348
 349 #define SPRINTF_BIT_A2(bit, name, max, ev) \
 350         do { \
 351                 if (test_bit(ev, dev->evbit)) \
 352                         SPRINTF_BIT_A(bit, name, max); \
 353         } while (0)
 354
 355 static void input_call_hotplug(char *verb, struct input_dev *dev)
 356 {
 357         char *argv[3], **envp, *buf, *scratch;
 358         int i = 0, j, value;
 359
 360         if (!hotplug_path[0]) {
 361                 printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n");
 362                 return;
 363         }
 364         if (in_interrupt()) {
 365                 printk(KERN_ERR "input.c: calling hotplug from interrupt\n");
 366                 return;
 367         }
 368         if (!current->fs->root) {
 369                 printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n");
 370                 return;
 371         }
 372         if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) {
 373                 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
 374                 return;
 375         }
 376         if (!(buf = kmalloc(1024, GFP_KERNEL))) {
 377                 kfree (envp);
 378                 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
 379                 return;
 380         }
 381
 382         argv[0] = hotplug_path;
 383         argv[1] = "input";
 384         argv[2] = NULL;
 385
 386         envp[i++] = "HOME=/";
 387         envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 388
 389         scratch = buf;
 390
 391         envp[i++] = scratch;
 392         scratch += sprintf(scratch, "ACTION=%s", verb) + 1;
 393
 394         envp[i++] = scratch;
 395         scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x",
 396                 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1;
 397
 398         if (dev->name) {
 399                 envp[i++] = scratch;
 400                 scratch += sprintf(scratch, "NAME=%s", dev->name) + 1;
 401         }
 402
 403         if (dev->phys) {
 404                 envp[i++] = scratch;
 405                 scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1;
 406         }
 407
 408         SPRINTF_BIT_A(evbit, "EV=", EV_MAX);
 409         SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY);
 410         SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL);
 411         SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS);
 412         SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC);
 413         SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED);
 414         SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND);
 415         SPRINTF_BIT_A2(ffbit,  "FF=",  FF_MAX, EV_FF);
 416         SPRINTF_BIT_A2(swbit,  "SW=",  SW_MAX, EV_SW);
 417
 418         envp[i++] = NULL;
 419
 420 #ifdef INPUT_DEBUG
 421         printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n",
 422                 argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]);
 423 #endif
 424
 425         value = call_usermodehelper(argv [0], argv, envp, 0);
 426
 427         kfree(buf);
 428         kfree(envp);
 429
 430 #ifdef INPUT_DEBUG
 431         if (value != 0)
 432                 printk(KERN_DEBUG "input.c: hotplug returned %d\n", value);
 433 #endif
 434 }
 435
 436 #endif
 437
 438 static int input_print_bitmap(char *buf, unsigned long *bitmap, int max)
 439 {
 440         int i;
 441         int len = 0;
 442
 443         for (i = NBITS(max) - 1; i > 0; i--)
 444                 if (bitmap[i])
 445                         break;
 446
 447         for (; i >= 0; i--)
 448                 len += sprintf(buf + len, "%lx%s", bitmap[i], i > 0 ? " " : "");
 449
 450         len += sprintf(buf + len, "\n");
 451
 452         return len;
 453 }
 454
 455 #ifdef CONFIG_PROC_FS
 456
 457 static struct proc_dir_entry *proc_bus_input_dir;
 458 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
 459 static int input_devices_state;
 460
 461 static inline void input_wakeup_procfs_readers(void)
 462 {
 463         input_devices_state++;
 464         wake_up(&input_devices_poll_wait);
 465 }
 466
 467 static unsigned int input_devices_poll(struct file *file, poll_table *wait)
 468 {
 469         int state = input_devices_state;
 470         poll_wait(file, &input_devices_poll_wait, wait);
 471         if (state != input_devices_state)
 472                 return POLLIN | POLLRDNORM;
 473         return 0;
 474 }
 475
 476 #define SPRINTF_BIT_B(ev, bm)                                           \
 477         do {                                                            \
 478                 len += sprintf(buf + len, "B: %s=", #ev);               \
 479                 len += input_print_bitmap(buf + len,                    \
 480                                         dev->bm##bit, ev##_MAX);        \
 481         } while (0)
 482
 483 #define SPRINTF_BIT_B2(ev, bm)                                          \
 484         do {                                                            \
 485                 if (test_bit(EV_##ev, dev->evbit))                      \
 486                         SPRINTF_BIT_B(ev, bm);                          \
 487         } while (0)
 488
 489 static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
 490 {
 491         struct input_dev *dev;
 492         struct input_handle *handle;
 493         const char *path;
 494
 495         off_t at = 0;
 496         int len, cnt = 0;
 497
 498         list_for_each_entry(dev, &input_dev_list, node) {
 499
 500                 path = dev->dynalloc ? kobject_get_path(&dev->cdev.kobj, GFP_KERNEL) : NULL;
 501
 502                 len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 503                         dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 504
 505                 len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 506                 len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 507                 len += sprintf(buf + len, "S: Sysfs=%s\n", path ? path : "");
 508                 len += sprintf(buf + len, "H: Handlers=");
 509
 510                 list_for_each_entry(handle, &dev->h_list, d_node)
 511                         len += sprintf(buf + len, "%s ", handle->name);
 512
 513                 len += sprintf(buf + len, "\n");
 514
 515                 SPRINTF_BIT_B(EV, ev);
 516                 SPRINTF_BIT_B2(KEY, key);
 517                 SPRINTF_BIT_B2(REL, rel);
 518                 SPRINTF_BIT_B2(ABS, abs);
 519                 SPRINTF_BIT_B2(MSC, msc);
 520                 SPRINTF_BIT_B2(LED, led);
 521                 SPRINTF_BIT_B2(SND, snd);
 522                 SPRINTF_BIT_B2(FF, ff);
 523                 SPRINTF_BIT_B2(SW, sw);
 524
 525                 len += sprintf(buf + len, "\n");
 526
 527                 at += len;
 528
 529                 if (at >= pos) {
 530                         if (!*start) {
 531                                 *start = buf + (pos - (at - len));
 532                                 cnt = at - pos;
 533                         } else  cnt += len;
 534                         buf += len;
 535                         if (cnt >= count)
 536                                 break;
 537                 }
 538
 539                 kfree(path);
 540         }
 541
 542         if (&dev->node == &input_dev_list)
 543                 *eof = 1;
 544
 545         return (count > cnt) ? cnt : count;
 546 }
 547
 548 static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
 549 {
 550         struct input_handler *handler;
 551
 552         off_t at = 0;
 553         int len = 0, cnt = 0;
 554         int i = 0;
 555
 556         list_for_each_entry(handler, &input_handler_list, node) {
 557
 558                 if (handler->fops)
 559                         len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
 560                                 i++, handler->name, handler->minor);
 561                 else
 562                         len = sprintf(buf, "N: Number=%d Name=%s\n",
 563                                 i++, handler->name);
 564
 565                 at += len;
 566
 567                 if (at >= pos) {
 568                         if (!*start) {
 569                                 *start = buf + (pos - (at - len));
 570                                 cnt = at - pos;
 571                         } else  cnt += len;
 572                         buf += len;
 573                         if (cnt >= count)
 574                                 break;
 575                 }
 576         }
 577         if (&handler->node == &input_handler_list)
 578                 *eof = 1;
 579
 580         return (count > cnt) ? cnt : count;
 581 }
 582
 583 static struct file_operations input_fileops;
 584
 585 static int __init input_proc_init(void)
 586 {
 587         struct proc_dir_entry *entry;
 588
 589         proc_bus_input_dir = proc_mkdir("input", proc_bus);
 590         if (!proc_bus_input_dir)
 591                 return -ENOMEM;
 592
 593         proc_bus_input_dir->owner = THIS_MODULE;
 594
 595         entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
 596         if (!entry)
 597                 goto fail1;
 598
 599         entry->owner = THIS_MODULE;
 600         input_fileops = *entry->proc_fops;
 601         entry->proc_fops = &input_fileops;
 602         entry->proc_fops->poll = input_devices_poll;
 603
 604         entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
 605         if (!entry)
 606                 goto fail2;
 607
 608         entry->owner = THIS_MODULE;
 609
 610         return 0;
 611
 612  fail2: remove_proc_entry("devices", proc_bus_input_dir);
 613  fail1: remove_proc_entry("input", proc_bus);
 614         return -ENOMEM;
 615 }
 616
 617 static void input_proc_exit(void)
 618 {
 619         remove_proc_entry("devices", proc_bus_input_dir);
 620         remove_proc_entry("handlers", proc_bus_input_dir);
 621         remove_proc_entry("input", proc_bus);
 622 }
 623
 624 #else /* !CONFIG_PROC_FS */
 625 static inline void input_wakeup_procfs_readers(void) { }
 626 static inline int input_proc_init(void) { return 0; }
 627 static inline void input_proc_exit(void) { }
 628 #endif
 629
 630 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
 631 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
 632 {                                                                               \
 633         struct input_dev *input_dev = to_input_dev(dev);                        \
 634         int retval;                                                             \
 635                                                                                 \
 636         retval = down_interruptible(&input_dev->sem);                           \
 637         if (retval)                                                             \
 638                 return retval;                                                  \
 639                                                                                 \
 640         retval = sprintf(buf, "%s\n", input_dev->name ? input_dev->name : "");  \
 641                                                                                 \
 642         up(&input_dev->sem);                                                    \
 643                                                                                 \
 644         return retval;                                                          \
 645 }                                                                               \
 646 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
 647
 648 INPUT_DEV_STRING_ATTR_SHOW(name);
 649 INPUT_DEV_STRING_ATTR_SHOW(phys);
 650 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 651
 652 static struct attribute *input_dev_attrs[] = {
 653         &class_device_attr_name.attr,
 654         &class_device_attr_phys.attr,
 655         &class_device_attr_uniq.attr,
 656         NULL
 657 };
 658
 659 static struct attribute_group input_dev_group = {
 660         .attrs  = input_dev_attrs,
 661 };
 662
 663 #define INPUT_DEV_ID_ATTR(name)                                                 \
 664 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
 665 {                                                                               \
 666         struct input_dev *input_dev = to_input_dev(dev);                        \
 667         return sprintf(buf, "%04x\n", input_dev->id.name);                      \
 668 }                                                                               \
 669 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
 670
 671 INPUT_DEV_ID_ATTR(bustype);
 672 INPUT_DEV_ID_ATTR(vendor);
 673 INPUT_DEV_ID_ATTR(product);
 674 INPUT_DEV_ID_ATTR(version);
 675
 676 static struct attribute *input_dev_id_attrs[] = {
 677         &class_device_attr_bustype.attr,
 678         &class_device_attr_vendor.attr,
 679         &class_device_attr_product.attr,
 680         &class_device_attr_version.attr,
 681         NULL
 682 };
 683
 684 static struct attribute_group input_dev_id_attr_group = {
 685         .name   = "id",
 686         .attrs  = input_dev_id_attrs,
 687 };
 688
 689 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
 690 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
 691 {                                                                               \
 692         struct input_dev *input_dev = to_input_dev(dev);                        \
 693         return input_print_bitmap(buf, input_dev->bm##bit, ev##_MAX);           \
 694 }                                                                               \
 695 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
 696
 697 INPUT_DEV_CAP_ATTR(EV, ev);
 698 INPUT_DEV_CAP_ATTR(KEY, key);
 699 INPUT_DEV_CAP_ATTR(REL, rel);
 700 INPUT_DEV_CAP_ATTR(ABS, abs);
 701 INPUT_DEV_CAP_ATTR(MSC, msc);
 702 INPUT_DEV_CAP_ATTR(LED, led);
 703 INPUT_DEV_CAP_ATTR(SND, snd);
 704 INPUT_DEV_CAP_ATTR(FF, ff);
 705 INPUT_DEV_CAP_ATTR(SW, sw);
 706
 707 static struct attribute *input_dev_caps_attrs[] = {
 708         &class_device_attr_ev.attr,
 709         &class_device_attr_key.attr,
 710         &class_device_attr_rel.attr,
 711         &class_device_attr_abs.attr,
 712         &class_device_attr_msc.attr,
 713         &class_device_attr_led.attr,
 714         &class_device_attr_snd.attr,
 715         &class_device_attr_ff.attr,
 716         &class_device_attr_sw.attr,
 717         NULL
 718 };
 719
 720 static struct attribute_group input_dev_caps_attr_group = {
 721         .name   = "capabilities",
 722         .attrs  = input_dev_caps_attrs,
 723 };
 724
 725 static void input_dev_release(struct class_device *class_dev)
 726 {
 727         struct input_dev *dev = to_input_dev(class_dev);
 728
 729         kfree(dev);
 730         module_put(THIS_MODULE);
 731 }
 732
 733 struct class input_dev_class = {
 734         .name                   = "input_dev",
 735         .release                = input_dev_release,
 736 };
 737
 738 struct input_dev *input_allocate_device(void)
 739 {
 740         struct input_dev *dev;
 741
 742         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
 743         if (dev) {
 744                 dev->dynalloc = 1;
 745                 dev->cdev.class = &input_dev_class;
 746                 class_device_initialize(&dev->cdev);
 747                 INIT_LIST_HEAD(&dev->h_list);
 748                 INIT_LIST_HEAD(&dev->node);
 749         }
 750
 751         return dev;
 752 }
 753
 754 static void input_register_classdevice(struct input_dev *dev)
 755 {
 756         static atomic_t input_no = ATOMIC_INIT(0);
 757         const char *path;
 758
 759         __module_get(THIS_MODULE);
 760
 761         dev->dev = dev->cdev.dev;
 762
 763         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
 764                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
 765
 766         path = kobject_get_path(&dev->cdev.class->subsys.kset.kobj, GFP_KERNEL);
 767         printk(KERN_INFO "input: %s/%s as %s\n",
 768                 dev->name ? dev->name : "Unspecified device",
 769                 path ? path : "", dev->cdev.class_id);
 770         kfree(path);
 771
 772         class_device_add(&dev->cdev);
 773         sysfs_create_group(&dev->cdev.kobj, &input_dev_group);
 774         sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 775         sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
 776 }
 777
 778 void input_register_device(struct input_dev *dev)
 779 {
 780         struct input_handle *handle;
 781         struct input_handler *handler;
 782         struct input_device_id *id;
 783
 784         set_bit(EV_SYN, dev->evbit);
 785
 786         init_MUTEX(&dev->sem);
 787
 788         /*
 789          * If delay and period are pre-set by the driver, then autorepeating
 790          * is handled by the driver itself and we don't do it in input.c.
 791          */
 792
 793         init_timer(&dev->timer);
 794         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
 795                 dev->timer.data = (long) dev;
 796                 dev->timer.function = input_repeat_key;
 797                 dev->rep[REP_DELAY] = 250;
 798                 dev->rep[REP_PERIOD] = 33;
 799         }
 800
 801         INIT_LIST_HEAD(&dev->h_list);
 802         list_add_tail(&dev->node, &input_dev_list);
 803
 804         if (dev->dynalloc)
 805                 input_register_classdevice(dev);
 806
 807         list_for_each_entry(handler, &input_handler_list, node)
 808                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 809                         if ((id = input_match_device(handler->id_table, dev)))
 810                                 if ((handle = handler->connect(handler, dev, id)))
 811                                         input_link_handle(handle);
 812
 813
 814 #ifdef CONFIG_HOTPLUG
 815         input_call_hotplug("add", dev);
 816 #endif
 817
 818         input_wakeup_procfs_readers();
 819 }
 820
 821 void input_unregister_device(struct input_dev *dev)
 822 {
 823         struct list_head * node, * next;
 824
 825         if (!dev) return;
 826
 827         del_timer_sync(&dev->timer);
 828
 829         list_for_each_safe(node, next, &dev->h_list) {
 830                 struct input_handle * handle = to_handle(node);
 831                 list_del_init(&handle->d_node);
 832                 list_del_init(&handle->h_node);
 833                 handle->handler->disconnect(handle);
 834         }
 835
 836 #ifdef CONFIG_HOTPLUG
 837         input_call_hotplug("remove", dev);
 838 #endif
 839
 840         list_del_init(&dev->node);
 841
 842         if (dev->dynalloc) {
 843                 sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
 844                 sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
 845                 class_device_unregister(&dev->cdev);
 846         }
 847
 848         input_wakeup_procfs_readers();
 849 }
 850
 851 void input_register_handler(struct input_handler *handler)
 852 {
 853         struct input_dev *dev;
 854         struct input_handle *handle;
 855         struct input_device_id *id;
 856
 857         if (!handler) return;
 858
 859         INIT_LIST_HEAD(&handler->h_list);
 860
 861         if (handler->fops != NULL)
 862                 input_table[handler->minor >> 5] = handler;
 863
 864         list_add_tail(&handler->node, &input_handler_list);
 865
 866         list_for_each_entry(dev, &input_dev_list, node)
 867                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 868                         if ((id = input_match_device(handler->id_table, dev)))
 869                                 if ((handle = handler->connect(handler, dev, id)))
 870                                         input_link_handle(handle);
 871
 872         input_wakeup_procfs_readers();
 873 }
 874
 875 void input_unregister_handler(struct input_handler *handler)
 876 {
 877         struct list_head * node, * next;
 878
 879         list_for_each_safe(node, next, &handler->h_list) {
 880                 struct input_handle * handle = to_handle_h(node);
 881                 list_del_init(&handle->h_node);
 882                 list_del_init(&handle->d_node);
 883                 handler->disconnect(handle);
 884         }
 885
 886         list_del_init(&handler->node);
 887
 888         if (handler->fops != NULL)
 889                 input_table[handler->minor >> 5] = NULL;
 890
 891         input_wakeup_procfs_readers();
 892 }
 893
 894 static int input_open_file(struct inode *inode, struct file *file)
 895 {
 896         struct input_handler *handler = input_table[iminor(inode) >> 5];
 897         struct file_operations *old_fops, *new_fops = NULL;
 898         int err;
 899
 900         /* No load-on-demand here? */
 901         if (!handler || !(new_fops = fops_get(handler->fops)))
 902                 return -ENODEV;
 903
 904         /*
 905          * That's _really_ odd. Usually NULL ->open means "nothing special",
 906          * not "no device". Oh, well...
 907          */
 908         if (!new_fops->open) {
 909                 fops_put(new_fops);
 910                 return -ENODEV;
 911         }
 912         old_fops = file->f_op;
 913         file->f_op = new_fops;
 914
 915         err = new_fops->open(inode, file);
 916
 917         if (err) {
 918                 fops_put(file->f_op);
 919                 file->f_op = fops_get(old_fops);
 920         }
 921         fops_put(old_fops);
 922         return err;
 923 }
 924
 925 static struct file_operations input_fops = {
 926         .owner = THIS_MODULE,
 927         .open = input_open_file,
 928 };
 929
 930 struct class *input_class;
 931
 932 static int __init input_init(void)
 933 {
 934         int err;
 935
 936         err = class_register(&input_dev_class);
 937         if (err) {
 938                 printk(KERN_ERR "input: unable to register input_dev class\n");
 939                 return err;
 940         }
 941
 942         input_class = class_create(THIS_MODULE, "input");
 943         if (IS_ERR(input_class)) {
 944                 printk(KERN_ERR "input: unable to register input class\n");
 945                 err = PTR_ERR(input_class);
 946                 goto fail1;
 947         }
 948
 949         err = input_proc_init();
 950         if (err)
 951                 goto fail2;
 952
 953         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
 954         if (err) {
 955                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
 956                 goto fail3;
 957         }
 958
 959         return 0;
 960
 961  fail3: input_proc_exit();
 962  fail2: class_destroy(input_class);
 963  fail1: class_unregister(&input_dev_class);
 964         return err;
 965 }
 966
 967 static void __exit input_exit(void)
 968 {
 969         input_proc_exit();
 970         unregister_chrdev(INPUT_MAJOR, "input");
 971         class_destroy(input_class);
 972         class_unregister(&input_dev_class);
 973 }
 974
 975 subsys_initcall(input_init);
 976 module_exit(input_exit);