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/smp_lock.h>
  23 #include <linux/random.h>
  24 #include <linux/major.h>
  25 #include <linux/device.h>
  26 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
  27 #include <linux/miscdevice.h>
  28 #endif
  29
  30 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  31 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
  32 MODULE_LICENSE("GPL");
  33
  34 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
  35 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X  1024
  36 #endif
  37 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
  38 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y  768
  39 #endif
  40
  41 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
  42 module_param(xres, uint, 0644);
  43 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
  44
  45 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
  46 module_param(yres, uint, 0644);
  47 MODULE_PARM_DESC(yres, "Vertical screen resolution");
  48
  49 static unsigned tap_time = 200;
  50 module_param(tap_time, uint, 0644);
  51 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
  52
  53 struct mousedev_hw_data {
  54         int dx, dy, dz;
  55         int x, y;
  56         int abs_event;
  57         unsigned long buttons;
  58 };
  59
  60 struct mousedev {
  61         int exist;
  62         int open;
  63         int minor;
  64         char name[16];
  65         wait_queue_head_t wait;
  66         struct list_head list;
  67         struct input_handle handle;
  68
  69         struct mousedev_hw_data packet;
  70         unsigned int pkt_count;
  71         int old_x[4], old_y[4];
  72         int frac_dx, frac_dy;
  73         unsigned long touch;
  74 };
  75
  76 enum mousedev_emul {
  77         MOUSEDEV_EMUL_PS2,
  78         MOUSEDEV_EMUL_IMPS,
  79         MOUSEDEV_EMUL_EXPS
  80 };
  81
  82 struct mousedev_motion {
  83         int dx, dy, dz;
  84         unsigned long buttons;
  85 };
  86
  87 #define PACKET_QUEUE_LEN        16
  88 struct mousedev_list {
  89         struct fasync_struct *fasync;
  90         struct mousedev *mousedev;
  91         struct list_head node;
  92
  93         struct mousedev_motion packets[PACKET_QUEUE_LEN];
  94         unsigned int head, tail;
  95         spinlock_t packet_lock;
  96         int pos_x, pos_y;
  97
  98         signed char ps2[6];
  99         unsigned char ready, buffer, bufsiz;
 100         unsigned char imexseq, impsseq;
 101         enum mousedev_emul mode;
 102         unsigned long last_buttons;
 103 };
 104
 105 #define MOUSEDEV_SEQ_LEN        6
 106
 107 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
 108 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
 109
 110 static struct input_handler mousedev_handler;
 111
 112 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
 113 static struct mousedev mousedev_mix;
 114
 115 #define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
 116 #define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
 117
 118 static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 119 {
 120         int size, tmp;
 121         enum { FRACTION_DENOM = 128 };
 122
 123         if (mousedev->touch) {
 124                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 125                 if (size == 0)
 126                         size = 256 * 2;
 127
 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)
 160                                 size = xres ? : 1;
 161                         if (value > dev->absmax[ABS_X])
 162                                 value = dev->absmax[ABS_X];
 163                         if (value < dev->absmin[ABS_X])
 164                                 value = dev->absmin[ABS_X];
 165                         mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size;
 166                         mousedev->packet.abs_event = 1;
 167                         break;
 168
 169                 case ABS_Y:
 170                         size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
 171                         if (size == 0)
 172                                 size = yres ? : 1;
 173                         if (value > dev->absmax[ABS_Y])
 174                                 value = dev->absmax[ABS_Y];
 175                         if (value < dev->absmin[ABS_Y])
 176                                 value = dev->absmin[ABS_Y];
 177                         mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size;
 178                         mousedev->packet.abs_event = 1;
 179                         break;
 180         }
 181 }
 182
 183 static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
 184 {
 185         switch (code) {
 186                 case REL_X:     mousedev->packet.dx += value; break;
 187                 case REL_Y:     mousedev->packet.dy -= value; break;
 188                 case REL_WHEEL: mousedev->packet.dz -= value; break;
 189         }
 190 }
 191
 192 static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
 193 {
 194         int index;
 195
 196         switch (code) {
 197                 case BTN_TOUCH:
 198                 case BTN_0:
 199                 case BTN_LEFT:          index = 0; break;
 200                 case BTN_STYLUS:
 201                 case BTN_1:
 202                 case BTN_RIGHT:         index = 1; break;
 203                 case BTN_2:
 204                 case BTN_FORWARD:
 205                 case BTN_STYLUS2:
 206                 case BTN_MIDDLE:        index = 2; break;
 207                 case BTN_3:
 208                 case BTN_BACK:
 209                 case BTN_SIDE:          index = 3; break;
 210                 case BTN_4:
 211                 case BTN_EXTRA:         index = 4; break;
 212                 default:                return;
 213         }
 214
 215         if (value) {
 216                 set_bit(index, &mousedev->packet.buttons);
 217                 set_bit(index, &mousedev_mix.packet.buttons);
 218         } else {
 219                 clear_bit(index, &mousedev->packet.buttons);
 220                 clear_bit(index, &mousedev_mix.packet.buttons);
 221         }
 222 }
 223
 224 static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet)
 225 {
 226         struct mousedev_list *list;
 227         struct mousedev_motion *p;
 228         unsigned long flags;
 229         int wake_readers = 0;
 230
 231         list_for_each_entry(list, &mousedev->list, node) {
 232                 spin_lock_irqsave(&list->packet_lock, flags);
 233
 234                 p = &list->packets[list->head];
 235                 if (list->ready && p->buttons != mousedev->packet.buttons) {
 236                         unsigned int new_head = (list->head + 1) % PACKET_QUEUE_LEN;
 237                         if (new_head != list->tail) {
 238                                 p = &list->packets[list->head = new_head];
 239                                 memset(p, 0, sizeof(struct mousedev_motion));
 240                         }
 241                 }
 242
 243                 if (packet->abs_event) {
 244                         p->dx += packet->x - list->pos_x;
 245                         p->dy += packet->y - list->pos_y;
 246                         list->pos_x = packet->x;
 247                         list->pos_y = packet->y;
 248                 }
 249
 250                 list->pos_x += packet->dx;
 251                 list->pos_x = list->pos_x < 0 ? 0 : (list->pos_x >= xres ? xres : list->pos_x);
 252                 list->pos_y += packet->dy;
 253                 list->pos_y = list->pos_y < 0 ? 0 : (list->pos_y >= yres ? yres : list->pos_y);
 254
 255                 p->dx += packet->dx;
 256                 p->dy += packet->dy;
 257                 p->dz += packet->dz;
 258                 p->buttons = mousedev->packet.buttons;
 259
 260                 if (p->dx || p->dy || p->dz || p->buttons != list->last_buttons)
 261                         list->ready = 1;
 262
 263                 spin_unlock_irqrestore(&list->packet_lock, flags);
 264
 265                 if (list->ready) {
 266                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 267                         wake_readers = 1;
 268                 }
 269         }
 270
 271         if (wake_readers)
 272                 wake_up_interruptible(&mousedev->wait);
 273 }
 274
 275 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
 276 {
 277         if (!value) {
 278                 if (mousedev->touch &&
 279                     time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) {
 280                         /*
 281                          * Toggle left button to emulate tap.
 282                          * We rely on the fact that mousedev_mix always has 0
 283                          * motion packet so we won't mess current position.
 284                          */
 285                         set_bit(0, &mousedev->packet.buttons);
 286                         set_bit(0, &mousedev_mix.packet.buttons);
 287                         mousedev_notify_readers(mousedev, &mousedev_mix.packet);
 288                         mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet);
 289                         clear_bit(0, &mousedev->packet.buttons);
 290                         clear_bit(0, &mousedev_mix.packet.buttons);
 291                 }
 292                 mousedev->touch = mousedev->pkt_count = 0;
 293                 mousedev->frac_dx = 0;
 294                 mousedev->frac_dy = 0;
 295
 296         } else if (!mousedev->touch)
 297                 mousedev->touch = jiffies;
 298 }
 299
 300 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 301 {
 302         struct mousedev *mousedev = handle->private;
 303
 304         switch (type) {
 305                 case EV_ABS:
 306                         /* Ignore joysticks */
 307                         if (test_bit(BTN_TRIGGER, handle->dev->keybit))
 308                                 return;
 309
 310                         if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 311                                 mousedev_touchpad_event(handle->dev, mousedev, code, value);
 312                         else
 313                                 mousedev_abs_event(handle->dev, mousedev, code, value);
 314
 315                         break;
 316
 317                 case EV_REL:
 318                         mousedev_rel_event(mousedev, code, value);
 319                         break;
 320
 321                 case EV_KEY:
 322                         if (value != 2) {
 323                                 if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 324                                         mousedev_touchpad_touch(mousedev, value);
 325                                 else
 326                                         mousedev_key_event(mousedev, code, value);
 327                         }
 328                         break;
 329
 330                 case EV_SYN:
 331                         if (code == SYN_REPORT) {
 332                                 if (mousedev->touch) {
 333                                         mousedev->pkt_count++;
 334                                         /* Input system eats duplicate events, but we need all of them
 335                                          * to do correct averaging so apply present one forward
 336                                          */
 337                                         fx(0) = fx(1);
 338                                         fy(0) = fy(1);
 339                                 }
 340
 341                                 mousedev_notify_readers(mousedev, &mousedev->packet);
 342                                 mousedev_notify_readers(&mousedev_mix, &mousedev->packet);
 343
 344                                 mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0;
 345                                 mousedev->packet.abs_event = 0;
 346                         }
 347                         break;
 348         }
 349 }
 350
 351 static int mousedev_fasync(int fd, struct file *file, int on)
 352 {
 353         int retval;
 354         struct mousedev_list *list = file->private_data;
 355
 356         retval = fasync_helper(fd, file, on, &list->fasync);
 357
 358         return retval < 0 ? retval : 0;
 359 }
 360
 361 static void mousedev_free(struct mousedev *mousedev)
 362 {
 363         mousedev_table[mousedev->minor] = NULL;
 364         kfree(mousedev);
 365 }
 366
 367 static void mixdev_release(void)
 368 {
 369         struct input_handle *handle;
 370
 371         list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 372                 struct mousedev *mousedev = handle->private;
 373
 374                 if (!mousedev->open) {
 375                         if (mousedev->exist)
 376                                 input_close_device(&mousedev->handle);
 377                         else
 378                                 mousedev_free(mousedev);
 379                 }
 380         }
 381 }
 382
 383 static int mousedev_release(struct inode * inode, struct file * file)
 384 {
 385         struct mousedev_list *list = file->private_data;
 386
 387         mousedev_fasync(-1, file, 0);
 388
 389         list_del(&list->node);
 390
 391         if (!--list->mousedev->open) {
 392                 if (list->mousedev->minor == MOUSEDEV_MIX)
 393                         mixdev_release();
 394                 else if (!mousedev_mix.open) {
 395                         if (list->mousedev->exist)
 396                                 input_close_device(&list->mousedev->handle);
 397                         else
 398                                 mousedev_free(list->mousedev);
 399                 }
 400         }
 401
 402         kfree(list);
 403         return 0;
 404 }
 405
 406 static int mousedev_open(struct inode * inode, struct file * file)
 407 {
 408         struct mousedev_list *list;
 409         struct input_handle *handle;
 410         struct mousedev *mousedev;
 411         int i;
 412
 413 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 414         if (imajor(inode) == MISC_MAJOR)
 415                 i = MOUSEDEV_MIX;
 416         else
 417 #endif
 418                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
 419
 420         if (i >= MOUSEDEV_MINORS || !mousedev_table[i])
 421                 return -ENODEV;
 422
 423         if (!(list = kzalloc(sizeof(struct mousedev_list), GFP_KERNEL)))
 424                 return -ENOMEM;
 425
 426         spin_lock_init(&list->packet_lock);
 427         list->pos_x = xres / 2;
 428         list->pos_y = yres / 2;
 429         list->mousedev = mousedev_table[i];
 430         list_add_tail(&list->node, &mousedev_table[i]->list);
 431         file->private_data = list;
 432
 433         if (!list->mousedev->open++) {
 434                 if (list->mousedev->minor == MOUSEDEV_MIX) {
 435                         list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 436                                 mousedev = handle->private;
 437                                 if (!mousedev->open && mousedev->exist)
 438                                         input_open_device(handle);
 439                         }
 440                 } else
 441                         if (!mousedev_mix.open && list->mousedev->exist)
 442                                 input_open_device(&list->mousedev->handle);
 443         }
 444
 445         return 0;
 446 }
 447
 448 static inline int mousedev_limit_delta(int delta, int limit)
 449 {
 450         return delta > limit ? limit : (delta < -limit ? -limit : delta);
 451 }
 452
 453 static void mousedev_packet(struct mousedev_list *list, signed char *ps2_data)
 454 {
 455         struct mousedev_motion *p;
 456         unsigned long flags;
 457
 458         spin_lock_irqsave(&list->packet_lock, flags);
 459         p = &list->packets[list->tail];
 460
 461         ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
 462         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
 463         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
 464         p->dx -= ps2_data[1];
 465         p->dy -= ps2_data[2];
 466
 467         switch (list->mode) {
 468                 case MOUSEDEV_EMUL_EXPS:
 469                         ps2_data[3] = mousedev_limit_delta(p->dz, 7);
 470                         p->dz -= ps2_data[3];
 471                         ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
 472                         list->bufsiz = 4;
 473                         break;
 474
 475                 case MOUSEDEV_EMUL_IMPS:
 476                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 477                         ps2_data[3] = mousedev_limit_delta(p->dz, 127);
 478                         p->dz -= ps2_data[3];
 479                         list->bufsiz = 4;
 480                         break;
 481
 482                 case MOUSEDEV_EMUL_PS2:
 483                 default:
 484                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 485                         p->dz = 0;
 486                         list->bufsiz = 3;
 487                         break;
 488         }
 489
 490         if (!p->dx && !p->dy && !p->dz) {
 491                 if (list->tail == list->head) {
 492                         list->ready = 0;
 493                         list->last_buttons = p->buttons;
 494                 } else
 495                         list->tail = (list->tail + 1) % PACKET_QUEUE_LEN;
 496         }
 497
 498         spin_unlock_irqrestore(&list->packet_lock, flags);
 499 }
 500
 501
 502 static ssize_t mousedev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 503 {
 504         struct mousedev_list *list = file->private_data;
 505         unsigned char c;
 506         unsigned int i;
 507
 508         for (i = 0; i < count; i++) {
 509
 510                 if (get_user(c, buffer + i))
 511                         return -EFAULT;
 512
 513                 if (c == mousedev_imex_seq[list->imexseq]) {
 514                         if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
 515                                 list->imexseq = 0;
 516                                 list->mode = MOUSEDEV_EMUL_EXPS;
 517                         }
 518                 } else
 519                         list->imexseq = 0;
 520
 521                 if (c == mousedev_imps_seq[list->impsseq]) {
 522                         if (++list->impsseq == MOUSEDEV_SEQ_LEN) {
 523                                 list->impsseq = 0;
 524                                 list->mode = MOUSEDEV_EMUL_IMPS;
 525                         }
 526                 } else
 527                         list->impsseq = 0;
 528
 529                 list->ps2[0] = 0xfa;
 530
 531                 switch (c) {
 532
 533                         case 0xeb: /* Poll */
 534                                 mousedev_packet(list, &list->ps2[1]);
 535                                 list->bufsiz++; /* account for leading ACK */
 536                                 break;
 537
 538                         case 0xf2: /* Get ID */
 539                                 switch (list->mode) {
 540                                         case MOUSEDEV_EMUL_PS2:  list->ps2[1] = 0; break;
 541                                         case MOUSEDEV_EMUL_IMPS: list->ps2[1] = 3; break;
 542                                         case MOUSEDEV_EMUL_EXPS: list->ps2[1] = 4; break;
 543                                 }
 544                                 list->bufsiz = 2;
 545                                 break;
 546
 547                         case 0xe9: /* Get info */
 548                                 list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
 549                                 list->bufsiz = 4;
 550                                 break;
 551
 552                         case 0xff: /* Reset */
 553                                 list->impsseq = list->imexseq = 0;
 554                                 list->mode = MOUSEDEV_EMUL_PS2;
 555                                 list->ps2[1] = 0xaa; list->ps2[2] = 0x00;
 556                                 list->bufsiz = 3;
 557                                 break;
 558
 559                         default:
 560                                 list->bufsiz = 1;
 561                                 break;
 562                 }
 563
 564                 list->buffer = list->bufsiz;
 565         }
 566
 567         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 568
 569         wake_up_interruptible(&list->mousedev->wait);
 570
 571         return count;
 572 }
 573
 574 static ssize_t mousedev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 575 {
 576         struct mousedev_list *list = file->private_data;
 577         int retval = 0;
 578
 579         if (!list->ready && !list->buffer && (file->f_flags & O_NONBLOCK))
 580                 return -EAGAIN;
 581
 582         retval = wait_event_interruptible(list->mousedev->wait,
 583                                           !list->mousedev->exist || list->ready || list->buffer);
 584
 585         if (retval)
 586                 return retval;
 587
 588         if (!list->mousedev->exist)
 589                 return -ENODEV;
 590
 591         if (!list->buffer && list->ready) {
 592                 mousedev_packet(list, list->ps2);
 593                 list->buffer = list->bufsiz;
 594         }
 595
 596         if (count > list->buffer)
 597                 count = list->buffer;
 598
 599         list->buffer -= count;
 600
 601         if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer - count, count))
 602                 return -EFAULT;
 603
 604         return count;
 605 }
 606
 607 /* No kernel lock - fine */
 608 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 609 {
 610         struct mousedev_list *list = file->private_data;
 611
 612         poll_wait(file, &list->mousedev->wait, wait);
 613         return ((list->ready || list->buffer) ? (POLLIN | POLLRDNORM) : 0) |
 614                 (list->mousedev->exist ? 0 : (POLLHUP | POLLERR));
 615 }
 616
 617 static const struct file_operations mousedev_fops = {
 618         .owner =        THIS_MODULE,
 619         .read =         mousedev_read,
 620         .write =        mousedev_write,
 621         .poll =         mousedev_poll,
 622         .open =         mousedev_open,
 623         .release =      mousedev_release,
 624         .fasync =       mousedev_fasync,
 625 };
 626
 627 static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev,
 628                                              const 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 const 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         struct class_device *cdev;
 742         int error;
 743
 744         error = input_register_handler(&mousedev_handler);
 745         if (error)
 746                 return error;
 747
 748         memset(&mousedev_mix, 0, sizeof(struct mousedev));
 749         INIT_LIST_HEAD(&mousedev_mix.list);
 750         init_waitqueue_head(&mousedev_mix.wait);
 751         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 752         mousedev_mix.exist = 1;
 753         mousedev_mix.minor = MOUSEDEV_MIX;
 754
 755         cdev = class_device_create(&input_class, NULL,
 756                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");
 757         if (IS_ERR(cdev)) {
 758                 input_unregister_handler(&mousedev_handler);
 759                 return PTR_ERR(cdev);
 760         }
 761
 762 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 763         error = misc_register(&psaux_mouse);
 764         if (error)
 765                 printk(KERN_WARNING "mice: could not register psaux device, "
 766                         "error: %d\n", error);
 767         else
 768                 psaux_registered = 1;
 769 #endif
 770
 771         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 772
 773         return 0;
 774 }
 775
 776 static void __exit mousedev_exit(void)
 777 {
 778 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 779         if (psaux_registered)
 780                 misc_deregister(&psaux_mouse);
 781 #endif
 782         class_device_destroy(&input_class,
 783                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
 784         input_unregister_handler(&mousedev_handler);
 785 }
 786
 787 module_init(mousedev_init);
 788 module_exit(mousedev_exit);