git.oblomov.eu Git - linux-2.6/blob - drivers/input/mousedev.c

   1 /*
   2  * Input driver to ExplorerPS/2 device driver module.
   3  *
   4  * Copyright (c) 1999-2002 Vojtech Pavlik
   5  * Copyright (c) 2004      Dmitry Torokhov
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  */
  11
  12 #define MOUSEDEV_MINOR_BASE     32
  13 #define MOUSEDEV_MINORS         32
  14 #define MOUSEDEV_MIX            31
  15
  16 #include <linux/slab.h>
  17 #include <linux/poll.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/init.h>
  21 #include <linux/input.h>
  22 #include <linux/config.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/random.h>
  25 #include <linux/major.h>
  26 #include <linux/device.h>
  27 #include <linux/devfs_fs_kernel.h>
  28 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
  29 #include <linux/miscdevice.h>
  30 #endif
  31
  32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  33 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
  34 MODULE_LICENSE("GPL");
  35
  36 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
  37 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X  1024
  38 #endif
  39 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
  40 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y  768
  41 #endif
  42
  43 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
  44 module_param(xres, uint, 0);
  45 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
  46
  47 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
  48 module_param(yres, uint, 0);
  49 MODULE_PARM_DESC(yres, "Vertical screen resolution");
  50
  51 static unsigned tap_time = 200;
  52 module_param(tap_time, uint, 0);
  53 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
  54
  55 struct mousedev_hw_data {
  56         int dx, dy, dz;
  57         int x, y;
  58         int abs_event;
  59         unsigned long buttons;
  60 };
  61
  62 struct mousedev {
  63         int exist;
  64         int open;
  65         int minor;
  66         char name[16];
  67         wait_queue_head_t wait;
  68         struct list_head list;
  69         struct input_handle handle;
  70
  71         struct mousedev_hw_data packet;
  72         unsigned int pkt_count;
  73         int old_x[4], old_y[4];
  74         int frac_dx, frac_dy;
  75         unsigned long touch;
  76 };
  77
  78 enum mousedev_emul {
  79         MOUSEDEV_EMUL_PS2,
  80         MOUSEDEV_EMUL_IMPS,
  81         MOUSEDEV_EMUL_EXPS
  82 };
  83
  84 struct mousedev_motion {
  85         int dx, dy, dz;
  86         unsigned long buttons;
  87 };
  88
  89 #define PACKET_QUEUE_LEN        16
  90 struct mousedev_list {
  91         struct fasync_struct *fasync;
  92         struct mousedev *mousedev;
  93         struct list_head node;
  94
  95         struct mousedev_motion packets[PACKET_QUEUE_LEN];
  96         unsigned int head, tail;
  97         spinlock_t packet_lock;
  98         int pos_x, pos_y;
  99
 100         signed char ps2[6];
 101         unsigned char ready, buffer, bufsiz;
 102         unsigned char imexseq, impsseq;
 103         enum mousedev_emul mode;
 104         unsigned long last_buttons;
 105 };
 106
 107 #define MOUSEDEV_SEQ_LEN        6
 108
 109 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
 110 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
 111
 112 static struct input_handler mousedev_handler;
 113
 114 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
 115 static struct mousedev mousedev_mix;
 116
 117 #define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
 118 #define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
 119
 120 static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 121 {
 122         int size, tmp;
 123         enum { FRACTION_DENOM = 128 };
 124
 125         if (mousedev->touch) {
 126                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 127                 if (size == 0) size = 256 * 2;
 128                 switch (code) {
 129                         case ABS_X:
 130                                 fx(0) = value;
 131                                 if (mousedev->pkt_count >= 2) {
 132                                         tmp = ((value - fx(2)) * (256 * FRACTION_DENOM)) / size;
 133                                         tmp += mousedev->frac_dx;
 134                                         mousedev->packet.dx = tmp / FRACTION_DENOM;
 135                                         mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
 136                                 }
 137                                 break;
 138
 139                         case ABS_Y:
 140                                 fy(0) = value;
 141                                 if (mousedev->pkt_count >= 2) {
 142                                         tmp = -((value - fy(2)) * (256 * FRACTION_DENOM)) / size;
 143                                         tmp += mousedev->frac_dy;
 144                                         mousedev->packet.dy = tmp / FRACTION_DENOM;
 145                                         mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
 146                                 }
 147                                 break;
 148                 }
 149         }
 150 }
 151
 152 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 153 {
 154         int size;
 155
 156         switch (code) {
 157                 case ABS_X:
 158                         size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 159                         if (size == 0) size = xres;
 160                         if (value > dev->absmax[ABS_X]) value = dev->absmax[ABS_X];
 161                         if (value < dev->absmin[ABS_X]) value = dev->absmin[ABS_X];
 162                         mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size;
 163                         mousedev->packet.abs_event = 1;
 164                         break;
 165
 166                 case ABS_Y:
 167                         size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
 168                         if (size == 0) size = yres;
 169                         if (value > dev->absmax[ABS_Y]) value = dev->absmax[ABS_Y];
 170                         if (value < dev->absmin[ABS_Y]) value = dev->absmin[ABS_Y];
 171                         mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size;
 172                         mousedev->packet.abs_event = 1;
 173                         break;
 174         }
 175 }
 176
 177 static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
 178 {
 179         switch (code) {
 180                 case REL_X:     mousedev->packet.dx += value; break;
 181                 case REL_Y:     mousedev->packet.dy -= value; break;
 182                 case REL_WHEEL: mousedev->packet.dz -= value; break;
 183         }
 184 }
 185
 186 static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
 187 {
 188         int index;
 189
 190         switch (code) {
 191                 case BTN_TOUCH:
 192                 case BTN_0:
 193                 case BTN_FORWARD:
 194                 case BTN_LEFT:          index = 0; break;
 195                 case BTN_STYLUS:
 196                 case BTN_1:
 197                 case BTN_RIGHT:         index = 1; break;
 198                 case BTN_2:
 199                 case BTN_STYLUS2:
 200                 case BTN_MIDDLE:        index = 2; break;
 201                 case BTN_3:
 202                 case BTN_BACK:
 203                 case BTN_SIDE:          index = 3; break;
 204                 case BTN_4:
 205                 case BTN_EXTRA:         index = 4; break;
 206                 default:                return;
 207         }
 208
 209         if (value) {
 210                 set_bit(index, &mousedev->packet.buttons);
 211                 set_bit(index, &mousedev_mix.packet.buttons);
 212         } else {
 213                 clear_bit(index, &mousedev->packet.buttons);
 214                 clear_bit(index, &mousedev_mix.packet.buttons);
 215         }
 216 }
 217
 218 static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet)
 219 {
 220         struct mousedev_list *list;
 221         struct mousedev_motion *p;
 222         unsigned long flags;
 223
 224         list_for_each_entry(list, &mousedev->list, node) {
 225                 spin_lock_irqsave(&list->packet_lock, flags);
 226
 227                 p = &list->packets[list->head];
 228                 if (list->ready && p->buttons != mousedev->packet.buttons) {
 229                         unsigned int new_head = (list->head + 1) % PACKET_QUEUE_LEN;
 230                         if (new_head != list->tail) {
 231                                 p = &list->packets[list->head = new_head];
 232                                 memset(p, 0, sizeof(struct mousedev_motion));
 233                         }
 234                 }
 235
 236                 if (packet->abs_event) {
 237                         p->dx += packet->x - list->pos_x;
 238                         p->dy += packet->y - list->pos_y;
 239                         list->pos_x = packet->x;
 240                         list->pos_y = packet->y;
 241                 }
 242
 243                 list->pos_x += packet->dx;
 244                 list->pos_x = list->pos_x < 0 ? 0 : (list->pos_x >= xres ? xres : list->pos_x);
 245                 list->pos_y += packet->dy;
 246                 list->pos_y = list->pos_y < 0 ? 0 : (list->pos_y >= yres ? yres : list->pos_y);
 247
 248                 p->dx += packet->dx;
 249                 p->dy += packet->dy;
 250                 p->dz += packet->dz;
 251                 p->buttons = mousedev->packet.buttons;
 252
 253                 if (p->dx || p->dy || p->dz || p->buttons != list->last_buttons)
 254                         list->ready = 1;
 255
 256                 spin_unlock_irqrestore(&list->packet_lock, flags);
 257
 258                 if (list->ready)
 259                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 260         }
 261
 262         wake_up_interruptible(&mousedev->wait);
 263 }
 264
 265 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
 266 {
 267         if (!value) {
 268                 if (mousedev->touch &&
 269                     time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) {
 270                         /*
 271                          * Toggle left button to emulate tap.
 272                          * We rely on the fact that mousedev_mix always has 0
 273                          * motion packet so we won't mess current position.
 274                          */
 275                         set_bit(0, &mousedev->packet.buttons);
 276                         set_bit(0, &mousedev_mix.packet.buttons);
 277                         mousedev_notify_readers(mousedev, &mousedev_mix.packet);
 278                         mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet);
 279                         clear_bit(0, &mousedev->packet.buttons);
 280                         clear_bit(0, &mousedev_mix.packet.buttons);
 281                 }
 282                 mousedev->touch = mousedev->pkt_count = 0;
 283                 mousedev->frac_dx = 0;
 284                 mousedev->frac_dy = 0;
 285         }
 286         else
 287                 if (!mousedev->touch)
 288                         mousedev->touch = jiffies;
 289 }
 290
 291 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 292 {
 293         struct mousedev *mousedev = handle->private;
 294
 295         switch (type) {
 296                 case EV_ABS:
 297                         /* Ignore joysticks */
 298                         if (test_bit(BTN_TRIGGER, handle->dev->keybit))
 299                                 return;
 300
 301                         if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 302                                 mousedev_touchpad_event(handle->dev, mousedev, code, value);
 303                         else
 304                                 mousedev_abs_event(handle->dev, mousedev, code, value);
 305
 306                         break;
 307
 308                 case EV_REL:
 309                         mousedev_rel_event(mousedev, code, value);
 310                         break;
 311
 312                 case EV_KEY:
 313                         if (value != 2) {
 314                                 if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 315                                         mousedev_touchpad_touch(mousedev, value);
 316                                 else
 317                                         mousedev_key_event(mousedev, code, value);
 318                         }
 319                         break;
 320
 321                 case EV_SYN:
 322                         if (code == SYN_REPORT) {
 323                                 if (mousedev->touch) {
 324                                         mousedev->pkt_count++;
 325                                         /* Input system eats duplicate events, but we need all of them
 326                                          * to do correct averaging so apply present one forward
 327                                          */
 328                                         fx(0) = fx(1);
 329                                         fy(0) = fy(1);
 330                                 }
 331
 332                                 mousedev_notify_readers(mousedev, &mousedev->packet);
 333                                 mousedev_notify_readers(&mousedev_mix, &mousedev->packet);
 334
 335                                 mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0;
 336                                 mousedev->packet.abs_event = 0;
 337                         }
 338                         break;
 339         }
 340 }
 341
 342 static int mousedev_fasync(int fd, struct file *file, int on)
 343 {
 344         int retval;
 345         struct mousedev_list *list = file->private_data;
 346         retval = fasync_helper(fd, file, on, &list->fasync);
 347         return retval < 0 ? retval : 0;
 348 }
 349
 350 static void mousedev_free(struct mousedev *mousedev)
 351 {
 352         mousedev_table[mousedev->minor] = NULL;
 353         kfree(mousedev);
 354 }
 355
 356 static int mixdev_release(void)
 357 {
 358         struct input_handle *handle;
 359
 360         list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 361                 struct mousedev *mousedev = handle->private;
 362
 363                 if (!mousedev->open) {
 364                         if (mousedev->exist)
 365                                 input_close_device(&mousedev->handle);
 366                         else
 367                                 mousedev_free(mousedev);
 368                 }
 369         }
 370
 371         return 0;
 372 }
 373
 374 static int mousedev_release(struct inode * inode, struct file * file)
 375 {
 376         struct mousedev_list *list = file->private_data;
 377
 378         mousedev_fasync(-1, file, 0);
 379
 380         list_del(&list->node);
 381
 382         if (!--list->mousedev->open) {
 383                 if (list->mousedev->minor == MOUSEDEV_MIX)
 384                         return mixdev_release();
 385
 386                 if (!mousedev_mix.open) {
 387                         if (list->mousedev->exist)
 388                                 input_close_device(&list->mousedev->handle);
 389                         else
 390                                 mousedev_free(list->mousedev);
 391                 }
 392         }
 393
 394         kfree(list);
 395         return 0;
 396 }
 397
 398 static int mousedev_open(struct inode * inode, struct file * file)
 399 {
 400         struct mousedev_list *list;
 401         struct input_handle *handle;
 402         struct mousedev *mousedev;
 403         int i;
 404
 405 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 406         if (imajor(inode) == MISC_MAJOR)
 407                 i = MOUSEDEV_MIX;
 408         else
 409 #endif
 410                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
 411
 412         if (i >= MOUSEDEV_MINORS || !mousedev_table[i])
 413                 return -ENODEV;
 414
 415         if (!(list = kmalloc(sizeof(struct mousedev_list), GFP_KERNEL)))
 416                 return -ENOMEM;
 417         memset(list, 0, sizeof(struct mousedev_list));
 418
 419         spin_lock_init(&list->packet_lock);
 420         list->pos_x = xres / 2;
 421         list->pos_y = yres / 2;
 422         list->mousedev = mousedev_table[i];
 423         list_add_tail(&list->node, &mousedev_table[i]->list);
 424         file->private_data = list;
 425
 426         if (!list->mousedev->open++) {
 427                 if (list->mousedev->minor == MOUSEDEV_MIX) {
 428                         list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 429                                 mousedev = handle->private;
 430                                 if (!mousedev->open && mousedev->exist)
 431                                         input_open_device(handle);
 432                         }
 433                 } else
 434                         if (!mousedev_mix.open && list->mousedev->exist)
 435                                 input_open_device(&list->mousedev->handle);
 436         }
 437
 438         return 0;
 439 }
 440
 441 static inline int mousedev_limit_delta(int delta, int limit)
 442 {
 443         return delta > limit ? limit : (delta < -limit ? -limit : delta);
 444 }
 445
 446 static void mousedev_packet(struct mousedev_list *list, signed char *ps2_data)
 447 {
 448         struct mousedev_motion *p;
 449         unsigned long flags;
 450
 451         spin_lock_irqsave(&list->packet_lock, flags);
 452         p = &list->packets[list->tail];
 453
 454         ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
 455         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
 456         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
 457         p->dx -= ps2_data[1];
 458         p->dy -= ps2_data[2];
 459
 460         switch (list->mode) {
 461                 case MOUSEDEV_EMUL_EXPS:
 462                         ps2_data[3] = mousedev_limit_delta(p->dz, 7);
 463                         p->dz -= ps2_data[3];
 464                         ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
 465                         list->bufsiz = 4;
 466                         break;
 467
 468                 case MOUSEDEV_EMUL_IMPS:
 469                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 470                         ps2_data[3] = mousedev_limit_delta(p->dz, 127);
 471                         p->dz -= ps2_data[3];
 472                         list->bufsiz = 4;
 473                         break;
 474
 475                 case MOUSEDEV_EMUL_PS2:
 476                 default:
 477                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 478                         p->dz = 0;
 479                         list->bufsiz = 3;
 480                         break;
 481         }
 482
 483         if (!p->dx && !p->dy && !p->dz) {
 484                 if (list->tail == list->head) {
 485                         list->ready = 0;
 486                         list->last_buttons = p->buttons;
 487                 } else
 488                         list->tail = (list->tail + 1) % PACKET_QUEUE_LEN;
 489         }
 490
 491         spin_unlock_irqrestore(&list->packet_lock, flags);
 492 }
 493
 494
 495 static ssize_t mousedev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 496 {
 497         struct mousedev_list *list = file->private_data;
 498         unsigned char c;
 499         unsigned int i;
 500
 501         for (i = 0; i < count; i++) {
 502
 503                 if (get_user(c, buffer + i))
 504                         return -EFAULT;
 505
 506                 if (c == mousedev_imex_seq[list->imexseq]) {
 507                         if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
 508                                 list->imexseq = 0;
 509                                 list->mode = MOUSEDEV_EMUL_EXPS;
 510                         }
 511                 } else list->imexseq = 0;
 512
 513                 if (c == mousedev_imps_seq[list->impsseq]) {
 514                         if (++list->impsseq == MOUSEDEV_SEQ_LEN) {
 515                                 list->impsseq = 0;
 516                                 list->mode = MOUSEDEV_EMUL_IMPS;
 517                         }
 518                 } else list->impsseq = 0;
 519
 520                 list->ps2[0] = 0xfa;
 521
 522                 switch (c) {
 523
 524                         case 0xeb: /* Poll */
 525                                 mousedev_packet(list, &list->ps2[1]);
 526                                 list->bufsiz++; /* account for leading ACK */
 527                                 break;
 528
 529                         case 0xf2: /* Get ID */
 530                                 switch (list->mode) {
 531                                         case MOUSEDEV_EMUL_PS2:  list->ps2[1] = 0; break;
 532                                         case MOUSEDEV_EMUL_IMPS: list->ps2[1] = 3; break;
 533                                         case MOUSEDEV_EMUL_EXPS: list->ps2[1] = 4; break;
 534                                 }
 535                                 list->bufsiz = 2;
 536                                 break;
 537
 538                         case 0xe9: /* Get info */
 539                                 list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
 540                                 list->bufsiz = 4;
 541                                 break;
 542
 543                         case 0xff: /* Reset */
 544                                 list->impsseq = list->imexseq = 0;
 545                                 list->mode = MOUSEDEV_EMUL_PS2;
 546                                 list->ps2[1] = 0xaa; list->ps2[2] = 0x00;
 547                                 list->bufsiz = 3;
 548                                 break;
 549
 550                         default:
 551                                 list->bufsiz = 1;
 552                                 break;
 553                 }
 554
 555                 list->buffer = list->bufsiz;
 556         }
 557
 558         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 559
 560         wake_up_interruptible(&list->mousedev->wait);
 561
 562         return count;
 563 }
 564
 565 static ssize_t mousedev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 566 {
 567         struct mousedev_list *list = file->private_data;
 568         int retval = 0;
 569
 570         if (!list->ready && !list->buffer && (file->f_flags & O_NONBLOCK))
 571                 return -EAGAIN;
 572
 573         retval = wait_event_interruptible(list->mousedev->wait,
 574                                           !list->mousedev->exist || list->ready || list->buffer);
 575
 576         if (retval)
 577                 return retval;
 578
 579         if (!list->mousedev->exist)
 580                 return -ENODEV;
 581
 582         if (!list->buffer && list->ready) {
 583                 mousedev_packet(list, list->ps2);
 584                 list->buffer = list->bufsiz;
 585         }
 586
 587         if (count > list->buffer)
 588                 count = list->buffer;
 589
 590         list->buffer -= count;
 591
 592         if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer - count, count))
 593                 return -EFAULT;
 594
 595         return count;
 596 }
 597
 598 /* No kernel lock - fine */
 599 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 600 {
 601         struct mousedev_list *list = file->private_data;
 602         poll_wait(file, &list->mousedev->wait, wait);
 603         return ((list->ready || list->buffer) ? (POLLIN | POLLRDNORM) : 0) |
 604                 (list->mousedev->exist ? 0 : (POLLHUP | POLLERR));
 605 }
 606
 607 static struct file_operations mousedev_fops = {
 608         .owner =        THIS_MODULE,
 609         .read =         mousedev_read,
 610         .write =        mousedev_write,
 611         .poll =         mousedev_poll,
 612         .open =         mousedev_open,
 613         .release =      mousedev_release,
 614         .fasync =       mousedev_fasync,
 615 };
 616
 617 static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 618 {
 619         struct mousedev *mousedev;
 620         int minor = 0;
 621
 622         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 623         if (minor == MOUSEDEV_MINORS) {
 624                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 625                 return NULL;
 626         }
 627
 628         if (!(mousedev = kmalloc(sizeof(struct mousedev), GFP_KERNEL)))
 629                 return NULL;
 630         memset(mousedev, 0, sizeof(struct mousedev));
 631
 632         INIT_LIST_HEAD(&mousedev->list);
 633         init_waitqueue_head(&mousedev->wait);
 634
 635         mousedev->minor = minor;
 636         mousedev->exist = 1;
 637         mousedev->handle.dev = dev;
 638         mousedev->handle.name = mousedev->name;
 639         mousedev->handle.handler = handler;
 640         mousedev->handle.private = mousedev;
 641         sprintf(mousedev->name, "mouse%d", minor);
 642
 643         if (mousedev_mix.open)
 644                 input_open_device(&mousedev->handle);
 645
 646         mousedev_table[minor] = mousedev;
 647
 648         devfs_mk_cdev(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
 649                         S_IFCHR|S_IRUGO|S_IWUSR, "input/mouse%d", minor);
 650         class_device_create(input_class,
 651                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
 652                         dev->dev, "mouse%d", minor);
 653
 654         return &mousedev->handle;
 655 }
 656
 657 static void mousedev_disconnect(struct input_handle *handle)
 658 {
 659         struct mousedev *mousedev = handle->private;
 660         struct mousedev_list *list;
 661
 662         class_device_destroy(input_class,
 663                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
 664         devfs_remove("input/mouse%d", mousedev->minor);
 665         mousedev->exist = 0;
 666
 667         if (mousedev->open) {
 668                 input_close_device(handle);
 669                 wake_up_interruptible(&mousedev->wait);
 670                 list_for_each_entry(list, &mousedev->list, node)
 671                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 672         } else {
 673                 if (mousedev_mix.open)
 674                         input_close_device(handle);
 675                 mousedev_free(mousedev);
 676         }
 677 }
 678
 679 static struct input_device_id mousedev_ids[] = {
 680         {
 681                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 682                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 683                 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
 684                 .relbit = { BIT(REL_X) | BIT(REL_Y) },
 685         },      /* A mouse like device, at least one button, two relative axes */
 686         {
 687                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 688                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 689                 .relbit = { BIT(REL_WHEEL) },
 690         },      /* A separate scrollwheel */
 691         {
 692                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 693                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 694                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 695                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
 696         },      /* A tablet like device, at least touch detection, two absolute axes */
 697         {
 698                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 699                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 700                 .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
 701                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
 702         },      /* A touchpad */
 703
 704         { },    /* Terminating entry */
 705 };
 706
 707 MODULE_DEVICE_TABLE(input, mousedev_ids);
 708
 709 static struct input_handler mousedev_handler = {
 710         .event =        mousedev_event,
 711         .connect =      mousedev_connect,
 712         .disconnect =   mousedev_disconnect,
 713         .fops =         &mousedev_fops,
 714         .minor =        MOUSEDEV_MINOR_BASE,
 715         .name =         "mousedev",
 716         .id_table =     mousedev_ids,
 717 };
 718
 719 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 720 static struct miscdevice psaux_mouse = {
 721         PSMOUSE_MINOR, "psaux", &mousedev_fops
 722 };
 723 static int psaux_registered;
 724 #endif
 725
 726 static int __init mousedev_init(void)
 727 {
 728         input_register_handler(&mousedev_handler);
 729
 730         memset(&mousedev_mix, 0, sizeof(struct mousedev));
 731         INIT_LIST_HEAD(&mousedev_mix.list);
 732         init_waitqueue_head(&mousedev_mix.wait);
 733         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 734         mousedev_mix.exist = 1;
 735         mousedev_mix.minor = MOUSEDEV_MIX;
 736
 737         devfs_mk_cdev(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX),
 738                         S_IFCHR|S_IRUGO|S_IWUSR, "input/mice");
 739         class_device_create(input_class,
 740                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");
 741
 742 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 743         if (!(psaux_registered = !misc_register(&psaux_mouse)))
 744                 printk(KERN_WARNING "mice: could not misc_register the device\n");
 745 #endif
 746
 747         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 748
 749         return 0;
 750 }
 751
 752 static void __exit mousedev_exit(void)
 753 {
 754 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 755         if (psaux_registered)
 756                 misc_deregister(&psaux_mouse);
 757 #endif
 758         devfs_remove("input/mice");
 759         class_device_destroy(input_class,
 760                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
 761         input_unregister_handler(&mousedev_handler);
 762 }
 763
 764 module_init(mousedev_init);
 765 module_exit(mousedev_exit);