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 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
  28 #include <linux/miscdevice.h>
  29 #endif
  30
  31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  32 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
  33 MODULE_LICENSE("GPL");
  34
  35 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
  36 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X  1024
  37 #endif
  38 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
  39 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y  768
  40 #endif
  41
  42 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
  43 module_param(xres, uint, 0644);
  44 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
  45
  46 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
  47 module_param(yres, uint, 0644);
  48 MODULE_PARM_DESC(yres, "Vertical screen resolution");
  49
  50 static unsigned tap_time = 200;
  51 module_param(tap_time, uint, 0644);
  52 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
  53
  54 struct mousedev_hw_data {
  55         int dx, dy, dz;
  56         int x, y;
  57         int abs_event;
  58         unsigned long buttons;
  59 };
  60
  61 struct mousedev {
  62         int exist;
  63         int open;
  64         int minor;
  65         char name[16];
  66         wait_queue_head_t wait;
  67         struct list_head list;
  68         struct input_handle handle;
  69
  70         struct mousedev_hw_data packet;
  71         unsigned int pkt_count;
  72         int old_x[4], old_y[4];
  73         int frac_dx, frac_dy;
  74         unsigned long touch;
  75 };
  76
  77 enum mousedev_emul {
  78         MOUSEDEV_EMUL_PS2,
  79         MOUSEDEV_EMUL_IMPS,
  80         MOUSEDEV_EMUL_EXPS
  81 };
  82
  83 struct mousedev_motion {
  84         int dx, dy, dz;
  85         unsigned long buttons;
  86 };
  87
  88 #define PACKET_QUEUE_LEN        16
  89 struct mousedev_list {
  90         struct fasync_struct *fasync;
  91         struct mousedev *mousedev;
  92         struct list_head node;
  93
  94         struct mousedev_motion packets[PACKET_QUEUE_LEN];
  95         unsigned int head, tail;
  96         spinlock_t packet_lock;
  97         int pos_x, pos_y;
  98
  99         signed char ps2[6];
 100         unsigned char ready, buffer, bufsiz;
 101         unsigned char imexseq, impsseq;
 102         enum mousedev_emul mode;
 103         unsigned long last_buttons;
 104 };
 105
 106 #define MOUSEDEV_SEQ_LEN        6
 107
 108 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
 109 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
 110
 111 static struct input_handler mousedev_handler;
 112
 113 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
 114 static struct mousedev mousedev_mix;
 115
 116 #define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
 117 #define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
 118
 119 static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 120 {
 121         int size, tmp;
 122         enum { FRACTION_DENOM = 128 };
 123
 124         if (mousedev->touch) {
 125                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 126                 if (size == 0)
 127                         size = 256 * 2;
 128
 129                 switch (code) {
 130                         case ABS_X:
 131                                 fx(0) = value;
 132                                 if (mousedev->pkt_count >= 2) {
 133                                         tmp = ((value - fx(2)) * (256 * FRACTION_DENOM)) / size;
 134                                         tmp += mousedev->frac_dx;
 135                                         mousedev->packet.dx = tmp / FRACTION_DENOM;
 136                                         mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
 137                                 }
 138                                 break;
 139
 140                         case ABS_Y:
 141                                 fy(0) = value;
 142                                 if (mousedev->pkt_count >= 2) {
 143                                         tmp = -((value - fy(2)) * (256 * FRACTION_DENOM)) / size;
 144                                         tmp += mousedev->frac_dy;
 145                                         mousedev->packet.dy = tmp / FRACTION_DENOM;
 146                                         mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
 147                                 }
 148                                 break;
 149                 }
 150         }
 151 }
 152
 153 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 154 {
 155         int size;
 156
 157         switch (code) {
 158                 case ABS_X:
 159                         size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 160                         if (size == 0)
 161                                 size = xres ? : 1;
 162                         if (value > dev->absmax[ABS_X])
 163                                 value = dev->absmax[ABS_X];
 164                         if (value < dev->absmin[ABS_X])
 165                                 value = dev->absmin[ABS_X];
 166                         mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size;
 167                         mousedev->packet.abs_event = 1;
 168                         break;
 169
 170                 case ABS_Y:
 171                         size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
 172                         if (size == 0)
 173                                 size = yres ? : 1;
 174                         if (value > dev->absmax[ABS_Y])
 175                                 value = dev->absmax[ABS_Y];
 176                         if (value < dev->absmin[ABS_Y])
 177                                 value = dev->absmin[ABS_Y];
 178                         mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size;
 179                         mousedev->packet.abs_event = 1;
 180                         break;
 181         }
 182 }
 183
 184 static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
 185 {
 186         switch (code) {
 187                 case REL_X:     mousedev->packet.dx += value; break;
 188                 case REL_Y:     mousedev->packet.dy -= value; break;
 189                 case REL_WHEEL: mousedev->packet.dz -= value; break;
 190         }
 191 }
 192
 193 static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
 194 {
 195         int index;
 196
 197         switch (code) {
 198                 case BTN_TOUCH:
 199                 case BTN_0:
 200                 case BTN_FORWARD:
 201                 case BTN_LEFT:          index = 0; break;
 202                 case BTN_STYLUS:
 203                 case BTN_1:
 204                 case BTN_RIGHT:         index = 1; break;
 205                 case BTN_2:
 206                 case BTN_STYLUS2:
 207                 case BTN_MIDDLE:        index = 2; break;
 208                 case BTN_3:
 209                 case BTN_BACK:
 210                 case BTN_SIDE:          index = 3; break;
 211                 case BTN_4:
 212                 case BTN_EXTRA:         index = 4; break;
 213                 default:                return;
 214         }
 215
 216         if (value) {
 217                 set_bit(index, &mousedev->packet.buttons);
 218                 set_bit(index, &mousedev_mix.packet.buttons);
 219         } else {
 220                 clear_bit(index, &mousedev->packet.buttons);
 221                 clear_bit(index, &mousedev_mix.packet.buttons);
 222         }
 223 }
 224
 225 static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet)
 226 {
 227         struct mousedev_list *list;
 228         struct mousedev_motion *p;
 229         unsigned long flags;
 230         int wake_readers = 0;
 231
 232         list_for_each_entry(list, &mousedev->list, node) {
 233                 spin_lock_irqsave(&list->packet_lock, flags);
 234
 235                 p = &list->packets[list->head];
 236                 if (list->ready && p->buttons != mousedev->packet.buttons) {
 237                         unsigned int new_head = (list->head + 1) % PACKET_QUEUE_LEN;
 238                         if (new_head != list->tail) {
 239                                 p = &list->packets[list->head = new_head];
 240                                 memset(p, 0, sizeof(struct mousedev_motion));
 241                         }
 242                 }
 243
 244                 if (packet->abs_event) {
 245                         p->dx += packet->x - list->pos_x;
 246                         p->dy += packet->y - list->pos_y;
 247                         list->pos_x = packet->x;
 248                         list->pos_y = packet->y;
 249                 }
 250
 251                 list->pos_x += packet->dx;
 252                 list->pos_x = list->pos_x < 0 ? 0 : (list->pos_x >= xres ? xres : list->pos_x);
 253                 list->pos_y += packet->dy;
 254                 list->pos_y = list->pos_y < 0 ? 0 : (list->pos_y >= yres ? yres : list->pos_y);
 255
 256                 p->dx += packet->dx;
 257                 p->dy += packet->dy;
 258                 p->dz += packet->dz;
 259                 p->buttons = mousedev->packet.buttons;
 260
 261                 if (p->dx || p->dy || p->dz || p->buttons != list->last_buttons)
 262                         list->ready = 1;
 263
 264                 spin_unlock_irqrestore(&list->packet_lock, flags);
 265
 266                 if (list->ready) {
 267                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 268                         wake_readers = 1;
 269                 }
 270         }
 271
 272         if (wake_readers)
 273                 wake_up_interruptible(&mousedev->wait);
 274 }
 275
 276 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
 277 {
 278         if (!value) {
 279                 if (mousedev->touch &&
 280                     time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) {
 281                         /*
 282                          * Toggle left button to emulate tap.
 283                          * We rely on the fact that mousedev_mix always has 0
 284                          * motion packet so we won't mess current position.
 285                          */
 286                         set_bit(0, &mousedev->packet.buttons);
 287                         set_bit(0, &mousedev_mix.packet.buttons);
 288                         mousedev_notify_readers(mousedev, &mousedev_mix.packet);
 289                         mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet);
 290                         clear_bit(0, &mousedev->packet.buttons);
 291                         clear_bit(0, &mousedev_mix.packet.buttons);
 292                 }
 293                 mousedev->touch = mousedev->pkt_count = 0;
 294                 mousedev->frac_dx = 0;
 295                 mousedev->frac_dy = 0;
 296
 297         } else if (!mousedev->touch)
 298                 mousedev->touch = jiffies;
 299 }
 300
 301 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 302 {
 303         struct mousedev *mousedev = handle->private;
 304
 305         switch (type) {
 306                 case EV_ABS:
 307                         /* Ignore joysticks */
 308                         if (test_bit(BTN_TRIGGER, handle->dev->keybit))
 309                                 return;
 310
 311                         if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 312                                 mousedev_touchpad_event(handle->dev, mousedev, code, value);
 313                         else
 314                                 mousedev_abs_event(handle->dev, mousedev, code, value);
 315
 316                         break;
 317
 318                 case EV_REL:
 319                         mousedev_rel_event(mousedev, code, value);
 320                         break;
 321
 322                 case EV_KEY:
 323                         if (value != 2) {
 324                                 if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 325                                         mousedev_touchpad_touch(mousedev, value);
 326                                 else
 327                                         mousedev_key_event(mousedev, code, value);
 328                         }
 329                         break;
 330
 331                 case EV_SYN:
 332                         if (code == SYN_REPORT) {
 333                                 if (mousedev->touch) {
 334                                         mousedev->pkt_count++;
 335                                         /* Input system eats duplicate events, but we need all of them
 336                                          * to do correct averaging so apply present one forward
 337                                          */
 338                                         fx(0) = fx(1);
 339                                         fy(0) = fy(1);
 340                                 }
 341
 342                                 mousedev_notify_readers(mousedev, &mousedev->packet);
 343                                 mousedev_notify_readers(&mousedev_mix, &mousedev->packet);
 344
 345                                 mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0;
 346                                 mousedev->packet.abs_event = 0;
 347                         }
 348                         break;
 349         }
 350 }
 351
 352 static int mousedev_fasync(int fd, struct file *file, int on)
 353 {
 354         int retval;
 355         struct mousedev_list *list = file->private_data;
 356
 357         retval = fasync_helper(fd, file, on, &list->fasync);
 358
 359         return retval < 0 ? retval : 0;
 360 }
 361
 362 static void mousedev_free(struct mousedev *mousedev)
 363 {
 364         mousedev_table[mousedev->minor] = NULL;
 365         kfree(mousedev);
 366 }
 367
 368 static void mixdev_release(void)
 369 {
 370         struct input_handle *handle;
 371
 372         list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 373                 struct mousedev *mousedev = handle->private;
 374
 375                 if (!mousedev->open) {
 376                         if (mousedev->exist)
 377                                 input_close_device(&mousedev->handle);
 378                         else
 379                                 mousedev_free(mousedev);
 380                 }
 381         }
 382 }
 383
 384 static int mousedev_release(struct inode * inode, struct file * file)
 385 {
 386         struct mousedev_list *list = file->private_data;
 387
 388         mousedev_fasync(-1, file, 0);
 389
 390         list_del(&list->node);
 391
 392         if (!--list->mousedev->open) {
 393                 if (list->mousedev->minor == MOUSEDEV_MIX)
 394                         mixdev_release();
 395                 else if (!mousedev_mix.open) {
 396                         if (list->mousedev->exist)
 397                                 input_close_device(&list->mousedev->handle);
 398                         else
 399                                 mousedev_free(list->mousedev);
 400                 }
 401         }
 402
 403         kfree(list);
 404         return 0;
 405 }
 406
 407 static int mousedev_open(struct inode * inode, struct file * file)
 408 {
 409         struct mousedev_list *list;
 410         struct input_handle *handle;
 411         struct mousedev *mousedev;
 412         int i;
 413
 414 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 415         if (imajor(inode) == MISC_MAJOR)
 416                 i = MOUSEDEV_MIX;
 417         else
 418 #endif
 419                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
 420
 421         if (i >= MOUSEDEV_MINORS || !mousedev_table[i])
 422                 return -ENODEV;
 423
 424         if (!(list = kzalloc(sizeof(struct mousedev_list), GFP_KERNEL)))
 425                 return -ENOMEM;
 426
 427         spin_lock_init(&list->packet_lock);
 428         list->pos_x = xres / 2;
 429         list->pos_y = yres / 2;
 430         list->mousedev = mousedev_table[i];
 431         list_add_tail(&list->node, &mousedev_table[i]->list);
 432         file->private_data = list;
 433
 434         if (!list->mousedev->open++) {
 435                 if (list->mousedev->minor == MOUSEDEV_MIX) {
 436                         list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 437                                 mousedev = handle->private;
 438                                 if (!mousedev->open && mousedev->exist)
 439                                         input_open_device(handle);
 440                         }
 441                 } else
 442                         if (!mousedev_mix.open && list->mousedev->exist)
 443                                 input_open_device(&list->mousedev->handle);
 444         }
 445
 446         return 0;
 447 }
 448
 449 static inline int mousedev_limit_delta(int delta, int limit)
 450 {
 451         return delta > limit ? limit : (delta < -limit ? -limit : delta);
 452 }
 453
 454 static void mousedev_packet(struct mousedev_list *list, signed char *ps2_data)
 455 {
 456         struct mousedev_motion *p;
 457         unsigned long flags;
 458
 459         spin_lock_irqsave(&list->packet_lock, flags);
 460         p = &list->packets[list->tail];
 461
 462         ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
 463         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
 464         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
 465         p->dx -= ps2_data[1];
 466         p->dy -= ps2_data[2];
 467
 468         switch (list->mode) {
 469                 case MOUSEDEV_EMUL_EXPS:
 470                         ps2_data[3] = mousedev_limit_delta(p->dz, 7);
 471                         p->dz -= ps2_data[3];
 472                         ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
 473                         list->bufsiz = 4;
 474                         break;
 475
 476                 case MOUSEDEV_EMUL_IMPS:
 477                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 478                         ps2_data[3] = mousedev_limit_delta(p->dz, 127);
 479                         p->dz -= ps2_data[3];
 480                         list->bufsiz = 4;
 481                         break;
 482
 483                 case MOUSEDEV_EMUL_PS2:
 484                 default:
 485                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 486                         p->dz = 0;
 487                         list->bufsiz = 3;
 488                         break;
 489         }
 490
 491         if (!p->dx && !p->dy && !p->dz) {
 492                 if (list->tail == list->head) {
 493                         list->ready = 0;
 494                         list->last_buttons = p->buttons;
 495                 } else
 496                         list->tail = (list->tail + 1) % PACKET_QUEUE_LEN;
 497         }
 498
 499         spin_unlock_irqrestore(&list->packet_lock, flags);
 500 }
 501
 502
 503 static ssize_t mousedev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 504 {
 505         struct mousedev_list *list = file->private_data;
 506         unsigned char c;
 507         unsigned int i;
 508
 509         for (i = 0; i < count; i++) {
 510
 511                 if (get_user(c, buffer + i))
 512                         return -EFAULT;
 513
 514                 if (c == mousedev_imex_seq[list->imexseq]) {
 515                         if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
 516                                 list->imexseq = 0;
 517                                 list->mode = MOUSEDEV_EMUL_EXPS;
 518                         }
 519                 } else
 520                         list->imexseq = 0;
 521
 522                 if (c == mousedev_imps_seq[list->impsseq]) {
 523                         if (++list->impsseq == MOUSEDEV_SEQ_LEN) {
 524                                 list->impsseq = 0;
 525                                 list->mode = MOUSEDEV_EMUL_IMPS;
 526                         }
 527                 } else
 528                         list->impsseq = 0;
 529
 530                 list->ps2[0] = 0xfa;
 531
 532                 switch (c) {
 533
 534                         case 0xeb: /* Poll */
 535                                 mousedev_packet(list, &list->ps2[1]);
 536                                 list->bufsiz++; /* account for leading ACK */
 537                                 break;
 538
 539                         case 0xf2: /* Get ID */
 540                                 switch (list->mode) {
 541                                         case MOUSEDEV_EMUL_PS2:  list->ps2[1] = 0; break;
 542                                         case MOUSEDEV_EMUL_IMPS: list->ps2[1] = 3; break;
 543                                         case MOUSEDEV_EMUL_EXPS: list->ps2[1] = 4; break;
 544                                 }
 545                                 list->bufsiz = 2;
 546                                 break;
 547
 548                         case 0xe9: /* Get info */
 549                                 list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
 550                                 list->bufsiz = 4;
 551                                 break;
 552
 553                         case 0xff: /* Reset */
 554                                 list->impsseq = list->imexseq = 0;
 555                                 list->mode = MOUSEDEV_EMUL_PS2;
 556                                 list->ps2[1] = 0xaa; list->ps2[2] = 0x00;
 557                                 list->bufsiz = 3;
 558                                 break;
 559
 560                         default:
 561                                 list->bufsiz = 1;
 562                                 break;
 563                 }
 564
 565                 list->buffer = list->bufsiz;
 566         }
 567
 568         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 569
 570         wake_up_interruptible(&list->mousedev->wait);
 571
 572         return count;
 573 }
 574
 575 static ssize_t mousedev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 576 {
 577         struct mousedev_list *list = file->private_data;
 578         int retval = 0;
 579
 580         if (!list->ready && !list->buffer && (file->f_flags & O_NONBLOCK))
 581                 return -EAGAIN;
 582
 583         retval = wait_event_interruptible(list->mousedev->wait,
 584                                           !list->mousedev->exist || list->ready || list->buffer);
 585
 586         if (retval)
 587                 return retval;
 588
 589         if (!list->mousedev->exist)
 590                 return -ENODEV;
 591
 592         if (!list->buffer && list->ready) {
 593                 mousedev_packet(list, list->ps2);
 594                 list->buffer = list->bufsiz;
 595         }
 596
 597         if (count > list->buffer)
 598                 count = list->buffer;
 599
 600         list->buffer -= count;
 601
 602         if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer - count, count))
 603                 return -EFAULT;
 604
 605         return count;
 606 }
 607
 608 /* No kernel lock - fine */
 609 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 610 {
 611         struct mousedev_list *list = file->private_data;
 612
 613         poll_wait(file, &list->mousedev->wait, wait);
 614         return ((list->ready || list->buffer) ? (POLLIN | POLLRDNORM) : 0) |
 615                 (list->mousedev->exist ? 0 : (POLLHUP | POLLERR));
 616 }
 617
 618 static struct file_operations mousedev_fops = {
 619         .owner =        THIS_MODULE,
 620         .read =         mousedev_read,
 621         .write =        mousedev_write,
 622         .poll =         mousedev_poll,
 623         .open =         mousedev_open,
 624         .release =      mousedev_release,
 625         .fasync =       mousedev_fasync,
 626 };
 627
 628 static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 629 {
 630         struct mousedev *mousedev;
 631         struct class_device *cdev;
 632         int minor = 0;
 633
 634         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 635         if (minor == MOUSEDEV_MINORS) {
 636                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 637                 return NULL;
 638         }
 639
 640         if (!(mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL)))
 641                 return NULL;
 642
 643         INIT_LIST_HEAD(&mousedev->list);
 644         init_waitqueue_head(&mousedev->wait);
 645
 646         mousedev->minor = minor;
 647         mousedev->exist = 1;
 648         mousedev->handle.dev = dev;
 649         mousedev->handle.name = mousedev->name;
 650         mousedev->handle.handler = handler;
 651         mousedev->handle.private = mousedev;
 652         sprintf(mousedev->name, "mouse%d", minor);
 653
 654         if (mousedev_mix.open)
 655                 input_open_device(&mousedev->handle);
 656
 657         mousedev_table[minor] = mousedev;
 658
 659         cdev = class_device_create(&input_class, &dev->cdev,
 660                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
 661                         dev->cdev.dev, mousedev->name);
 662
 663         /* temporary symlink to keep userspace happy */
 664         sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
 665                           mousedev->name);
 666
 667         return &mousedev->handle;
 668 }
 669
 670 static void mousedev_disconnect(struct input_handle *handle)
 671 {
 672         struct mousedev *mousedev = handle->private;
 673         struct mousedev_list *list;
 674
 675         sysfs_remove_link(&input_class.subsys.kset.kobj, mousedev->name);
 676         class_device_destroy(&input_class,
 677                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
 678         mousedev->exist = 0;
 679
 680         if (mousedev->open) {
 681                 input_close_device(handle);
 682                 wake_up_interruptible(&mousedev->wait);
 683                 list_for_each_entry(list, &mousedev->list, node)
 684                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 685         } else {
 686                 if (mousedev_mix.open)
 687                         input_close_device(handle);
 688                 mousedev_free(mousedev);
 689         }
 690 }
 691
 692 static struct input_device_id mousedev_ids[] = {
 693         {
 694                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 695                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 696                 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
 697                 .relbit = { BIT(REL_X) | BIT(REL_Y) },
 698         },      /* A mouse like device, at least one button, two relative axes */
 699         {
 700                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 701                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 702                 .relbit = { BIT(REL_WHEEL) },
 703         },      /* A separate scrollwheel */
 704         {
 705                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 706                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 707                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 708                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
 709         },      /* A tablet like device, at least touch detection, two absolute axes */
 710         {
 711                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 712                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 713                 .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
 714                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
 715         },      /* A touchpad */
 716
 717         { },    /* Terminating entry */
 718 };
 719
 720 MODULE_DEVICE_TABLE(input, mousedev_ids);
 721
 722 static struct input_handler mousedev_handler = {
 723         .event =        mousedev_event,
 724         .connect =      mousedev_connect,
 725         .disconnect =   mousedev_disconnect,
 726         .fops =         &mousedev_fops,
 727         .minor =        MOUSEDEV_MINOR_BASE,
 728         .name =         "mousedev",
 729         .id_table =     mousedev_ids,
 730 };
 731
 732 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 733 static struct miscdevice psaux_mouse = {
 734         PSMOUSE_MINOR, "psaux", &mousedev_fops
 735 };
 736 static int psaux_registered;
 737 #endif
 738
 739 static int __init mousedev_init(void)
 740 {
 741         input_register_handler(&mousedev_handler);
 742
 743         memset(&mousedev_mix, 0, sizeof(struct mousedev));
 744         INIT_LIST_HEAD(&mousedev_mix.list);
 745         init_waitqueue_head(&mousedev_mix.wait);
 746         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 747         mousedev_mix.exist = 1;
 748         mousedev_mix.minor = MOUSEDEV_MIX;
 749
 750         class_device_create(&input_class, NULL,
 751                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");
 752
 753 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 754         if (!(psaux_registered = !misc_register(&psaux_mouse)))
 755                 printk(KERN_WARNING "mice: could not misc_register the device\n");
 756 #endif
 757
 758         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 759
 760         return 0;
 761 }
 762
 763 static void __exit mousedev_exit(void)
 764 {
 765 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 766         if (psaux_registered)
 767                 misc_deregister(&psaux_mouse);
 768 #endif
 769         class_device_destroy(&input_class,
 770                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
 771         input_unregister_handler(&mousedev_handler);
 772 }
 773
 774 module_init(mousedev_init);
 775 module_exit(mousedev_exit);