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) size = 256 * 2;
 127                 switch (code) {
 128                         case ABS_X:
 129                                 fx(0) = value;
 130                                 if (mousedev->pkt_count >= 2) {
 131                                         tmp = ((value - fx(2)) * (256 * FRACTION_DENOM)) / size;
 132                                         tmp += mousedev->frac_dx;
 133                                         mousedev->packet.dx = tmp / FRACTION_DENOM;
 134                                         mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
 135                                 }
 136                                 break;
 137
 138                         case ABS_Y:
 139                                 fy(0) = value;
 140                                 if (mousedev->pkt_count >= 2) {
 141                                         tmp = -((value - fy(2)) * (256 * FRACTION_DENOM)) / size;
 142                                         tmp += mousedev->frac_dy;
 143                                         mousedev->packet.dy = tmp / FRACTION_DENOM;
 144                                         mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
 145                                 }
 146                                 break;
 147                 }
 148         }
 149 }
 150
 151 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 152 {
 153         int size;
 154
 155         switch (code) {
 156                 case ABS_X:
 157                         size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 158                         if (size == 0) size = xres ? : 1;
 159                         if (value > dev->absmax[ABS_X]) value = dev->absmax[ABS_X];
 160                         if (value < dev->absmin[ABS_X]) value = dev->absmin[ABS_X];
 161                         mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size;
 162                         mousedev->packet.abs_event = 1;
 163                         break;
 164
 165                 case ABS_Y:
 166                         size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
 167                         if (size == 0) size = yres ? : 1;
 168                         if (value > dev->absmax[ABS_Y]) value = dev->absmax[ABS_Y];
 169                         if (value < dev->absmin[ABS_Y]) value = dev->absmin[ABS_Y];
 170                         mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size;
 171                         mousedev->packet.abs_event = 1;
 172                         break;
 173         }
 174 }
 175
 176 static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
 177 {
 178         switch (code) {
 179                 case REL_X:     mousedev->packet.dx += value; break;
 180                 case REL_Y:     mousedev->packet.dy -= value; break;
 181                 case REL_WHEEL: mousedev->packet.dz -= value; break;
 182         }
 183 }
 184
 185 static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
 186 {
 187         int index;
 188
 189         switch (code) {
 190                 case BTN_TOUCH:
 191                 case BTN_0:
 192                 case BTN_FORWARD:
 193                 case BTN_LEFT:          index = 0; break;
 194                 case BTN_STYLUS:
 195                 case BTN_1:
 196                 case BTN_RIGHT:         index = 1; break;
 197                 case BTN_2:
 198                 case BTN_STYLUS2:
 199                 case BTN_MIDDLE:        index = 2; break;
 200                 case BTN_3:
 201                 case BTN_BACK:
 202                 case BTN_SIDE:          index = 3; break;
 203                 case BTN_4:
 204                 case BTN_EXTRA:         index = 4; break;
 205                 default:                return;
 206         }
 207
 208         if (value) {
 209                 set_bit(index, &mousedev->packet.buttons);
 210                 set_bit(index, &mousedev_mix.packet.buttons);
 211         } else {
 212                 clear_bit(index, &mousedev->packet.buttons);
 213                 clear_bit(index, &mousedev_mix.packet.buttons);
 214         }
 215 }
 216
 217 static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet)
 218 {
 219         struct mousedev_list *list;
 220         struct mousedev_motion *p;
 221         unsigned long flags;
 222         int wake_readers = 0;
 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                         wake_readers = 1;
 261                 }
 262         }
 263
 264         if (wake_readers)
 265                 wake_up_interruptible(&mousedev->wait);
 266 }
 267
 268 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
 269 {
 270         if (!value) {
 271                 if (mousedev->touch &&
 272                     time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) {
 273                         /*
 274                          * Toggle left button to emulate tap.
 275                          * We rely on the fact that mousedev_mix always has 0
 276                          * motion packet so we won't mess current position.
 277                          */
 278                         set_bit(0, &mousedev->packet.buttons);
 279                         set_bit(0, &mousedev_mix.packet.buttons);
 280                         mousedev_notify_readers(mousedev, &mousedev_mix.packet);
 281                         mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet);
 282                         clear_bit(0, &mousedev->packet.buttons);
 283                         clear_bit(0, &mousedev_mix.packet.buttons);
 284                 }
 285                 mousedev->touch = mousedev->pkt_count = 0;
 286                 mousedev->frac_dx = 0;
 287                 mousedev->frac_dy = 0;
 288         }
 289         else
 290                 if (!mousedev->touch)
 291                         mousedev->touch = jiffies;
 292 }
 293
 294 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 295 {
 296         struct mousedev *mousedev = handle->private;
 297
 298         switch (type) {
 299                 case EV_ABS:
 300                         /* Ignore joysticks */
 301                         if (test_bit(BTN_TRIGGER, handle->dev->keybit))
 302                                 return;
 303
 304                         if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 305                                 mousedev_touchpad_event(handle->dev, mousedev, code, value);
 306                         else
 307                                 mousedev_abs_event(handle->dev, mousedev, code, value);
 308
 309                         break;
 310
 311                 case EV_REL:
 312                         mousedev_rel_event(mousedev, code, value);
 313                         break;
 314
 315                 case EV_KEY:
 316                         if (value != 2) {
 317                                 if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 318                                         mousedev_touchpad_touch(mousedev, value);
 319                                 else
 320                                         mousedev_key_event(mousedev, code, value);
 321                         }
 322                         break;
 323
 324                 case EV_SYN:
 325                         if (code == SYN_REPORT) {
 326                                 if (mousedev->touch) {
 327                                         mousedev->pkt_count++;
 328                                         /* Input system eats duplicate events, but we need all of them
 329                                          * to do correct averaging so apply present one forward
 330                                          */
 331                                         fx(0) = fx(1);
 332                                         fy(0) = fy(1);
 333                                 }
 334
 335                                 mousedev_notify_readers(mousedev, &mousedev->packet);
 336                                 mousedev_notify_readers(&mousedev_mix, &mousedev->packet);
 337
 338                                 mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0;
 339                                 mousedev->packet.abs_event = 0;
 340                         }
 341                         break;
 342         }
 343 }
 344
 345 static int mousedev_fasync(int fd, struct file *file, int on)
 346 {
 347         int retval;
 348         struct mousedev_list *list = file->private_data;
 349         retval = fasync_helper(fd, file, on, &list->fasync);
 350         return retval < 0 ? retval : 0;
 351 }
 352
 353 static void mousedev_free(struct mousedev *mousedev)
 354 {
 355         mousedev_table[mousedev->minor] = NULL;
 356         kfree(mousedev);
 357 }
 358
 359 static void mixdev_release(void)
 360 {
 361         struct input_handle *handle;
 362
 363         list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 364                 struct mousedev *mousedev = handle->private;
 365
 366                 if (!mousedev->open) {
 367                         if (mousedev->exist)
 368                                 input_close_device(&mousedev->handle);
 369                         else
 370                                 mousedev_free(mousedev);
 371                 }
 372         }
 373 }
 374
 375 static int mousedev_release(struct inode * inode, struct file * file)
 376 {
 377         struct mousedev_list *list = file->private_data;
 378
 379         mousedev_fasync(-1, file, 0);
 380
 381         list_del(&list->node);
 382
 383         if (!--list->mousedev->open) {
 384                 if (list->mousedev->minor == MOUSEDEV_MIX)
 385                         mixdev_release();
 386                 else 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         struct class_device *cdev;
 621         int minor = 0;
 622
 623         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 624         if (minor == MOUSEDEV_MINORS) {
 625                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 626                 return NULL;
 627         }
 628
 629         if (!(mousedev = kmalloc(sizeof(struct mousedev), GFP_KERNEL)))
 630                 return NULL;
 631         memset(mousedev, 0, sizeof(struct mousedev));
 632
 633         INIT_LIST_HEAD(&mousedev->list);
 634         init_waitqueue_head(&mousedev->wait);
 635
 636         mousedev->minor = minor;
 637         mousedev->exist = 1;
 638         mousedev->handle.dev = dev;
 639         mousedev->handle.name = mousedev->name;
 640         mousedev->handle.handler = handler;
 641         mousedev->handle.private = mousedev;
 642         sprintf(mousedev->name, "mouse%d", minor);
 643
 644         if (mousedev_mix.open)
 645                 input_open_device(&mousedev->handle);
 646
 647         mousedev_table[minor] = mousedev;
 648
 649         cdev = class_device_create(&input_class, &dev->cdev,
 650                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
 651                         dev->cdev.dev, mousedev->name);
 652
 653         /* temporary symlink to keep userspace happy */
 654         sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
 655                           mousedev->name);
 656
 657         return &mousedev->handle;
 658 }
 659
 660 static void mousedev_disconnect(struct input_handle *handle)
 661 {
 662         struct mousedev *mousedev = handle->private;
 663         struct mousedev_list *list;
 664
 665         sysfs_remove_link(&input_class.subsys.kset.kobj, mousedev->name);
 666         class_device_destroy(&input_class,
 667                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
 668         mousedev->exist = 0;
 669
 670         if (mousedev->open) {
 671                 input_close_device(handle);
 672                 wake_up_interruptible(&mousedev->wait);
 673                 list_for_each_entry(list, &mousedev->list, node)
 674                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 675         } else {
 676                 if (mousedev_mix.open)
 677                         input_close_device(handle);
 678                 mousedev_free(mousedev);
 679         }
 680 }
 681
 682 static struct input_device_id mousedev_ids[] = {
 683         {
 684                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 685                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 686                 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
 687                 .relbit = { BIT(REL_X) | BIT(REL_Y) },
 688         },      /* A mouse like device, at least one button, two relative axes */
 689         {
 690                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 691                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 692                 .relbit = { BIT(REL_WHEEL) },
 693         },      /* A separate scrollwheel */
 694         {
 695                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 696                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 697                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 698                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
 699         },      /* A tablet like device, at least touch detection, two absolute axes */
 700         {
 701                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 702                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 703                 .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
 704                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
 705         },      /* A touchpad */
 706
 707         { },    /* Terminating entry */
 708 };
 709
 710 MODULE_DEVICE_TABLE(input, mousedev_ids);
 711
 712 static struct input_handler mousedev_handler = {
 713         .event =        mousedev_event,
 714         .connect =      mousedev_connect,
 715         .disconnect =   mousedev_disconnect,
 716         .fops =         &mousedev_fops,
 717         .minor =        MOUSEDEV_MINOR_BASE,
 718         .name =         "mousedev",
 719         .id_table =     mousedev_ids,
 720 };
 721
 722 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 723 static struct miscdevice psaux_mouse = {
 724         PSMOUSE_MINOR, "psaux", &mousedev_fops
 725 };
 726 static int psaux_registered;
 727 #endif
 728
 729 static int __init mousedev_init(void)
 730 {
 731         input_register_handler(&mousedev_handler);
 732
 733         memset(&mousedev_mix, 0, sizeof(struct mousedev));
 734         INIT_LIST_HEAD(&mousedev_mix.list);
 735         init_waitqueue_head(&mousedev_mix.wait);
 736         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 737         mousedev_mix.exist = 1;
 738         mousedev_mix.minor = MOUSEDEV_MIX;
 739
 740         class_device_create(&input_class, NULL,
 741                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");
 742
 743 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 744         if (!(psaux_registered = !misc_register(&psaux_mouse)))
 745                 printk(KERN_WARNING "mice: could not misc_register the device\n");
 746 #endif
 747
 748         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 749
 750         return 0;
 751 }
 752
 753 static void __exit mousedev_exit(void)
 754 {
 755 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 756         if (psaux_registered)
 757                 misc_deregister(&psaux_mouse);
 758 #endif
 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);