drivers/input/mousedev.c

   1 /*
   2  * Input driver to ExplorerPS/2 device driver module.
   3  *
   4  * Copyright (c) 1999-2002 Vojtech Pavlik
   5  * Copyright (c) 2004      Dmitry Torokhov
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  */
  11
  12 #define MOUSEDEV_MINOR_BASE     32
  13 #define MOUSEDEV_MINORS         32
  14 #define MOUSEDEV_MIX            31
  15
  16 #include <linux/slab.h>
  17 #include <linux/poll.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/init.h>
  21 #include <linux/input.h>
  22 #include <linux/config.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/random.h>
  25 #include <linux/major.h>
  26 #include <linux/device.h>
  27 #include <linux/devfs_fs_kernel.h>
  28 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
  29 #include <linux/miscdevice.h>
  30 #endif
  31
  32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  33 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
  34 MODULE_LICENSE("GPL");
  35
  36 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
  37 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X  1024
  38 #endif
  39 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
  40 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y  768
  41 #endif
  42
  43 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
  44 module_param(xres, uint, 0);
  45 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
  46
  47 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
  48 module_param(yres, uint, 0);
  49 MODULE_PARM_DESC(yres, "Vertical screen resolution");
  50
  51 static unsigned tap_time = 200;
  52 module_param(tap_time, uint, 0);
  53 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
  54
  55 struct mousedev_hw_data {
  56         int dx, dy, dz;
  57         int x, y;
  58         int abs_event;
  59         unsigned long buttons;
  60 };
  61
  62 struct mousedev {
  63         int exist;
  64         int open;
  65         int minor;
  66         char name[16];
  67         wait_queue_head_t wait;
  68         struct list_head list;
  69         struct input_handle handle;
  70
  71         struct mousedev_hw_data packet;
  72         unsigned int pkt_count;
  73         int old_x[4], old_y[4];
  74         int frac_dx, frac_dy;
  75         unsigned long touch;
  76 };
  77
  78 enum mousedev_emul {
  79         MOUSEDEV_EMUL_PS2,
  80         MOUSEDEV_EMUL_IMPS,
  81         MOUSEDEV_EMUL_EXPS
  82 };
  83
  84 struct mousedev_motion {
  85         int dx, dy, dz;
  86         unsigned long buttons;
  87 };
  88
  89 #define PACKET_QUEUE_LEN        16
  90 struct mousedev_list {
  91         struct fasync_struct *fasync;
  92         struct mousedev *mousedev;
  93         struct list_head node;
  94
  95         struct mousedev_motion packets[PACKET_QUEUE_LEN];
  96         unsigned int head, tail;
  97         spinlock_t packet_lock;
  98         int pos_x, pos_y;
  99
 100         signed char ps2[6];
 101         unsigned char ready, buffer, bufsiz;
 102         unsigned char imexseq, impsseq;
 103         enum mousedev_emul mode;
 104         unsigned long last_buttons;
 105 };
 106
 107 #define MOUSEDEV_SEQ_LEN        6
 108
 109 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
 110 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
 111
 112 static struct input_handler mousedev_handler;
 113
 114 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
 115 static struct mousedev mousedev_mix;
 116
 117 #define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
 118 #define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
 119
 120 static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 121 {
 122         int size, tmp;
 123         enum { FRACTION_DENOM = 128 };
 124
 125         if (mousedev->touch) {
 126                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 127                 if (size == 0) size = 256 * 2;
 128                 switch (code) {
 129                         case ABS_X:
 130                                 fx(0) = value;
 131                                 if (mousedev->pkt_count >= 2) {
 132                                         tmp = ((value - fx(2)) * (256 * FRACTION_DENOM)) / size;
 133                                         tmp += mousedev->frac_dx;
 134                                         mousedev->packet.dx = tmp / FRACTION_DENOM;
 135                                         mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
 136                                 }
 137                                 break;
 138
 139                         case ABS_Y:
 140                                 fy(0) = value;
 141                                 if (mousedev->pkt_count >= 2) {
 142                                         tmp = -((value - fy(2)) * (256 * FRACTION_DENOM)) / size;
 143                                         tmp += mousedev->frac_dy;
 144                                         mousedev->packet.dy = tmp / FRACTION_DENOM;
 145                                         mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
 146                                 }
 147                                 break;
 148                 }
 149         }
 150 }
 151
 152 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 153 {
 154         int size;
 155
 156         switch (code) {
 157                 case ABS_X:
 158                         size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 159                         if (size == 0) size = xres;
 160                         if (value > dev->absmax[ABS_X]) value = dev->absmax[ABS_X];
 161                         if (value < dev->absmin[ABS_X]) value = dev->absmin[ABS_X];
 162                         mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size;
 163                         mousedev->packet.abs_event = 1;
 164                         break;
 165
 166                 case ABS_Y:
 167                         size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
 168                         if (size == 0) size = yres;
 169                         if (value > dev->absmax[ABS_Y]) value = dev->absmax[ABS_Y];
 170                         if (value < dev->absmin[ABS_Y]) value = dev->absmin[ABS_Y];
 171                         mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size;
 172                         mousedev->packet.abs_event = 1;
 173                         break;
 174         }
 175 }
 176
 177 static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
 178 {
 179         switch (code) {
 180                 case REL_X:     mousedev->packet.dx += value; break;
 181                 case REL_Y:     mousedev->packet.dy -= value; break;
 182                 case REL_WHEEL: mousedev->packet.dz -= value; break;
 183         }
 184 }
 185
 186 static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
 187 {
 188         int index;
 189
 190         switch (code) {
 191                 case BTN_TOUCH:
 192                 case BTN_0:
 193                 case BTN_FORWARD:
 194                 case BTN_LEFT:          index = 0; break;
 195                 case BTN_STYLUS:
 196                 case BTN_1:
 197                 case BTN_RIGHT:         index = 1; break;
 198                 case BTN_2:
 199                 case BTN_STYLUS2:
 200                 case BTN_MIDDLE:        index = 2; break;
 201                 case BTN_3:
 202                 case BTN_BACK:
 203                 case BTN_SIDE:          index = 3; break;
 204                 case BTN_4:
 205                 case BTN_EXTRA:         index = 4; break;
 206                 default:                return;
 207         }
 208
 209         if (value) {
 210                 set_bit(index, &mousedev->packet.buttons);
 211                 set_bit(index, &mousedev_mix.packet.buttons);
 212         } else {
 213                 clear_bit(index, &mousedev->packet.buttons);
 214                 clear_bit(index, &mousedev_mix.packet.buttons);
 215         }
 216 }
 217
 218 static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet)
 219 {
 220         struct mousedev_list *list;
 221         struct mousedev_motion *p;
 222         unsigned long flags;
 223         int wake_readers = 0;
 224
 225         list_for_each_entry(list, &mousedev->list, node) {
 226                 spin_lock_irqsave(&list->packet_lock, flags);
 227
 228                 p = &list->packets[list->head];
 229                 if (list->ready && p->buttons != mousedev->packet.buttons) {
 230                         unsigned int new_head = (list->head + 1) % PACKET_QUEUE_LEN;
 231                         if (new_head != list->tail) {
 232                                 p = &list->packets[list->head = new_head];
 233                                 memset(p, 0, sizeof(struct mousedev_motion));
 234                         }
 235                 }
 236
 237                 if (packet->abs_event) {
 238                         p->dx += packet->x - list->pos_x;
 239                         p->dy += packet->y - list->pos_y;
 240                         list->pos_x = packet->x;
 241                         list->pos_y = packet->y;
 242                 }
 243
 244                 list->pos_x += packet->dx;
 245                 list->pos_x = list->pos_x < 0 ? 0 : (list->pos_x >= xres ? xres : list->pos_x);
 246                 list->pos_y += packet->dy;
 247                 list->pos_y = list->pos_y < 0 ? 0 : (list->pos_y >= yres ? yres : list->pos_y);
 248
 249                 p->dx += packet->dx;
 250                 p->dy += packet->dy;
 251                 p->dz += packet->dz;
 252                 p->buttons = mousedev->packet.buttons;
 253
 254                 if (p->dx || p->dy || p->dz || p->buttons != list->last_buttons)
 255                         list->ready = 1;
 256
 257                 spin_unlock_irqrestore(&list->packet_lock, flags);
 258
 259                 if (list->ready) {
 260                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 261                         wake_readers = 1;
 262                 }
 263         }
 264
 265         if (wake_readers)
 266                 wake_up_interruptible(&mousedev->wait);
 267 }
 268
 269 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
 270 {
 271         if (!value) {
 272                 if (mousedev->touch &&
 273                     time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) {
 274                         /*
 275                          * Toggle left button to emulate tap.
 276                          * We rely on the fact that mousedev_mix always has 0
 277                          * motion packet so we won't mess current position.
 278                          */
 279                         set_bit(0, &mousedev->packet.buttons);
 280                         set_bit(0, &mousedev_mix.packet.buttons);
 281                         mousedev_notify_readers(mousedev, &mousedev_mix.packet);
 282                         mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet);
 283                         clear_bit(0, &mousedev->packet.buttons);
 284                         clear_bit(0, &mousedev_mix.packet.buttons);
 285                 }
 286                 mousedev->touch = mousedev->pkt_count = 0;
 287                 mousedev->frac_dx = 0;
 288                 mousedev->frac_dy = 0;
 289         }
 290         else
 291                 if (!mousedev->touch)
 292                         mousedev->touch = jiffies;
 293 }
 294
 295 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 296 {
 297         struct mousedev *mousedev = handle->private;
 298
 299         switch (type) {
 300                 case EV_ABS:
 301                         /* Ignore joysticks */
 302                         if (test_bit(BTN_TRIGGER, handle->dev->keybit))
 303                                 return;
 304
 305                         if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 306                                 mousedev_touchpad_event(handle->dev, mousedev, code, value);
 307                         else
 308                                 mousedev_abs_event(handle->dev, mousedev, code, value);
 309
 310                         break;
 311
 312                 case EV_REL:
 313                         mousedev_rel_event(mousedev, code, value);
 314                         break;
 315
 316                 case EV_KEY:
 317                         if (value != 2) {
 318                                 if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 319                                         mousedev_touchpad_touch(mousedev, value);
 320                                 else
 321                                         mousedev_key_event(mousedev, code, value);
 322                         }
 323                         break;
 324
 325                 case EV_SYN:
 326                         if (code == SYN_REPORT) {
 327                                 if (mousedev->touch) {
 328                                         mousedev->pkt_count++;
 329                                         /* Input system eats duplicate events, but we need all of them
 330                                          * to do correct averaging so apply present one forward
 331                                          */
 332                                         fx(0) = fx(1);
 333                                         fy(0) = fy(1);
 334                                 }
 335
 336                                 mousedev_notify_readers(mousedev, &mousedev->packet);
 337                                 mousedev_notify_readers(&mousedev_mix, &mousedev->packet);
 338
 339                                 mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0;
 340                                 mousedev->packet.abs_event = 0;
 341                         }
 342                         break;
 343         }
 344 }
 345
 346 static int mousedev_fasync(int fd, struct file *file, int on)
 347 {
 348         int retval;
 349         struct mousedev_list *list = file->private_data;
 350         retval = fasync_helper(fd, file, on, &list->fasync);
 351         return retval < 0 ? retval : 0;
 352 }
 353
 354 static void mousedev_free(struct mousedev *mousedev)
 355 {
 356         mousedev_table[mousedev->minor] = NULL;
 357         kfree(mousedev);
 358 }
 359
 360 static int mixdev_release(void)
 361 {
 362         struct input_handle *handle;
 363
 364         list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 365                 struct mousedev *mousedev = handle->private;
 366
 367                 if (!mousedev->open) {
 368                         if (mousedev->exist)
 369                                 input_close_device(&mousedev->handle);
 370                         else
 371                                 mousedev_free(mousedev);
 372                 }
 373         }
 374
 375         return 0;
 376 }
 377
 378 static int mousedev_release(struct inode * inode, struct file * file)
 379 {
 380         struct mousedev_list *list = file->private_data;
 381
 382         mousedev_fasync(-1, file, 0);
 383
 384         list_del(&list->node);
 385
 386         if (!--list->mousedev->open) {
 387                 if (list->mousedev->minor == MOUSEDEV_MIX)
 388                         return mixdev_release();
 389
 390                 if (!mousedev_mix.open) {
 391                         if (list->mousedev->exist)
 392                                 input_close_device(&list->mousedev->handle);
 393                         else
 394                                 mousedev_free(list->mousedev);
 395                 }
 396         }
 397
 398         kfree(list);
 399         return 0;
 400 }
 401
 402 static int mousedev_open(struct inode * inode, struct file * file)
 403 {
 404         struct mousedev_list *list;
 405         struct input_handle *handle;
 406         struct mousedev *mousedev;
 407         int i;
 408
 409 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 410         if (imajor(inode) == MISC_MAJOR)
 411                 i = MOUSEDEV_MIX;
 412         else
 413 #endif
 414                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
 415
 416         if (i >= MOUSEDEV_MINORS || !mousedev_table[i])
 417                 return -ENODEV;
 418
 419         if (!(list = kmalloc(sizeof(struct mousedev_list), GFP_KERNEL)))
 420                 return -ENOMEM;
 421         memset(list, 0, sizeof(struct mousedev_list));
 422
 423         spin_lock_init(&list->packet_lock);
 424         list->pos_x = xres / 2;
 425         list->pos_y = yres / 2;
 426         list->mousedev = mousedev_table[i];
 427         list_add_tail(&list->node, &mousedev_table[i]->list);
 428         file->private_data = list;
 429
 430         if (!list->mousedev->open++) {
 431                 if (list->mousedev->minor == MOUSEDEV_MIX) {
 432                         list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 433                                 mousedev = handle->private;
 434                                 if (!mousedev->open && mousedev->exist)
 435                                         input_open_device(handle);
 436                         }
 437                 } else
 438                         if (!mousedev_mix.open && list->mousedev->exist)
 439                                 input_open_device(&list->mousedev->handle);
 440         }
 441
 442         return 0;
 443 }
 444
 445 static inline int mousedev_limit_delta(int delta, int limit)
 446 {
 447         return delta > limit ? limit : (delta < -limit ? -limit : delta);
 448 }
 449
 450 static void mousedev_packet(struct mousedev_list *list, signed char *ps2_data)
 451 {
 452         struct mousedev_motion *p;
 453         unsigned long flags;
 454
 455         spin_lock_irqsave(&list->packet_lock, flags);
 456         p = &list->packets[list->tail];
 457
 458         ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
 459         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
 460         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
 461         p->dx -= ps2_data[1];
 462         p->dy -= ps2_data[2];
 463
 464         switch (list->mode) {
 465                 case MOUSEDEV_EMUL_EXPS:
 466                         ps2_data[3] = mousedev_limit_delta(p->dz, 7);
 467                         p->dz -= ps2_data[3];
 468                         ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
 469                         list->bufsiz = 4;
 470                         break;
 471
 472                 case MOUSEDEV_EMUL_IMPS:
 473                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 474                         ps2_data[3] = mousedev_limit_delta(p->dz, 127);
 475                         p->dz -= ps2_data[3];
 476                         list->bufsiz = 4;
 477                         break;
 478
 479                 case MOUSEDEV_EMUL_PS2:
 480                 default:
 481                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 482                         p->dz = 0;
 483                         list->bufsiz = 3;
 484                         break;
 485         }
 486
 487         if (!p->dx && !p->dy && !p->dz) {
 488                 if (list->tail == list->head) {
 489                         list->ready = 0;
 490                         list->last_buttons = p->buttons;
 491                 } else
 492                         list->tail = (list->tail + 1) % PACKET_QUEUE_LEN;
 493         }
 494
 495         spin_unlock_irqrestore(&list->packet_lock, flags);
 496 }
 497
 498
 499 static ssize_t mousedev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 500 {
 501         struct mousedev_list *list = file->private_data;
 502         unsigned char c;
 503         unsigned int i;
 504
 505         for (i = 0; i < count; i++) {
 506
 507                 if (get_user(c, buffer + i))
 508                         return -EFAULT;
 509
 510                 if (c == mousedev_imex_seq[list->imexseq]) {
 511                         if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
 512                                 list->imexseq = 0;
 513                                 list->mode = MOUSEDEV_EMUL_EXPS;
 514                         }
 515                 } else list->imexseq = 0;
 516
 517                 if (c == mousedev_imps_seq[list->impsseq]) {
 518                         if (++list->impsseq == MOUSEDEV_SEQ_LEN) {
 519                                 list->impsseq = 0;
 520                                 list->mode = MOUSEDEV_EMUL_IMPS;
 521                         }
 522                 } else list->impsseq = 0;
 523
 524                 list->ps2[0] = 0xfa;
 525
 526                 switch (c) {
 527
 528                         case 0xeb: /* Poll */
 529                                 mousedev_packet(list, &list->ps2[1]);
 530                                 list->bufsiz++; /* account for leading ACK */
 531                                 break;
 532
 533                         case 0xf2: /* Get ID */
 534                                 switch (list->mode) {
 535                                         case MOUSEDEV_EMUL_PS2:  list->ps2[1] = 0; break;
 536                                         case MOUSEDEV_EMUL_IMPS: list->ps2[1] = 3; break;
 537                                         case MOUSEDEV_EMUL_EXPS: list->ps2[1] = 4; break;
 538                                 }
 539                                 list->bufsiz = 2;
 540                                 break;
 541
 542                         case 0xe9: /* Get info */
 543                                 list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
 544                                 list->bufsiz = 4;
 545                                 break;
 546
 547                         case 0xff: /* Reset */
 548                                 list->impsseq = list->imexseq = 0;
 549                                 list->mode = MOUSEDEV_EMUL_PS2;
 550                                 list->ps2[1] = 0xaa; list->ps2[2] = 0x00;
 551                                 list->bufsiz = 3;
 552                                 break;
 553
 554                         default:
 555                                 list->bufsiz = 1;
 556                                 break;
 557                 }
 558
 559                 list->buffer = list->bufsiz;
 560         }
 561
 562         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 563
 564         wake_up_interruptible(&list->mousedev->wait);
 565
 566         return count;
 567 }
 568
 569 static ssize_t mousedev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 570 {
 571         struct mousedev_list *list = file->private_data;
 572         int retval = 0;
 573
 574         if (!list->ready && !list->buffer && (file->f_flags & O_NONBLOCK))
 575                 return -EAGAIN;
 576
 577         retval = wait_event_interruptible(list->mousedev->wait,
 578                                           !list->mousedev->exist || list->ready || list->buffer);
 579
 580         if (retval)
 581                 return retval;
 582
 583         if (!list->mousedev->exist)
 584                 return -ENODEV;
 585
 586         if (!list->buffer && list->ready) {
 587                 mousedev_packet(list, list->ps2);
 588                 list->buffer = list->bufsiz;
 589         }
 590
 591         if (count > list->buffer)
 592                 count = list->buffer;
 593
 594         list->buffer -= count;
 595
 596         if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer - count, count))
 597                 return -EFAULT;
 598
 599         return count;
 600 }
 601
 602 /* No kernel lock - fine */
 603 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 604 {
 605         struct mousedev_list *list = file->private_data;
 606         poll_wait(file, &list->mousedev->wait, wait);
 607         return ((list->ready || list->buffer) ? (POLLIN | POLLRDNORM) : 0) |
 608                 (list->mousedev->exist ? 0 : (POLLHUP | POLLERR));
 609 }
 610
 611 static struct file_operations mousedev_fops = {
 612         .owner =        THIS_MODULE,
 613         .read =         mousedev_read,
 614         .write =        mousedev_write,
 615         .poll =         mousedev_poll,
 616         .open =         mousedev_open,
 617         .release =      mousedev_release,
 618         .fasync =       mousedev_fasync,
 619 };
 620
 621 static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 622 {
 623         struct mousedev *mousedev;
 624         int minor = 0;
 625
 626         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 627         if (minor == MOUSEDEV_MINORS) {
 628                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 629                 return NULL;
 630         }
 631
 632         if (!(mousedev = kmalloc(sizeof(struct mousedev), GFP_KERNEL)))
 633                 return NULL;
 634         memset(mousedev, 0, sizeof(struct mousedev));
 635
 636         INIT_LIST_HEAD(&mousedev->list);
 637         init_waitqueue_head(&mousedev->wait);
 638
 639         mousedev->minor = minor;
 640         mousedev->exist = 1;
 641         mousedev->handle.dev = dev;
 642         mousedev->handle.name = mousedev->name;
 643         mousedev->handle.handler = handler;
 644         mousedev->handle.private = mousedev;
 645         sprintf(mousedev->name, "mouse%d", minor);
 646
 647         if (mousedev_mix.open)
 648                 input_open_device(&mousedev->handle);
 649
 650         mousedev_table[minor] = mousedev;
 651
 652         devfs_mk_cdev(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
 653                         S_IFCHR|S_IRUGO|S_IWUSR, "input/mouse%d", minor);
 654         class_device_create(input_class,
 655                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
 656                         dev->dev, "mouse%d", minor);
 657
 658         return &mousedev->handle;
 659 }
 660
 661 static void mousedev_disconnect(struct input_handle *handle)
 662 {
 663         struct mousedev *mousedev = handle->private;
 664         struct mousedev_list *list;
 665
 666         class_device_destroy(input_class,
 667                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
 668         devfs_remove("input/mouse%d", mousedev->minor);
 669         mousedev->exist = 0;
 670
 671         if (mousedev->open) {
 672                 input_close_device(handle);
 673                 wake_up_interruptible(&mousedev->wait);
 674                 list_for_each_entry(list, &mousedev->list, node)
 675                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 676         } else {
 677                 if (mousedev_mix.open)
 678                         input_close_device(handle);
 679                 mousedev_free(mousedev);
 680         }
 681 }
 682
 683 static struct input_device_id mousedev_ids[] = {
 684         {
 685                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 686                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 687                 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
 688                 .relbit = { BIT(REL_X) | BIT(REL_Y) },
 689         },      /* A mouse like device, at least one button, two relative axes */
 690         {
 691                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 692                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 693                 .relbit = { BIT(REL_WHEEL) },
 694         },      /* A separate scrollwheel */
 695         {
 696                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 697                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 698                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 699                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
 700         },      /* A tablet like device, at least touch detection, two absolute axes */
 701         {
 702                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 703                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 704                 .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
 705                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
 706         },      /* A touchpad */
 707
 708         { },    /* Terminating entry */
 709 };
 710
 711 MODULE_DEVICE_TABLE(input, mousedev_ids);
 712
 713 static struct input_handler mousedev_handler = {
 714         .event =        mousedev_event,
 715         .connect =      mousedev_connect,
 716         .disconnect =   mousedev_disconnect,
 717         .fops =         &mousedev_fops,
 718         .minor =        MOUSEDEV_MINOR_BASE,
 719         .name =         "mousedev",
 720         .id_table =     mousedev_ids,
 721 };
 722
 723 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 724 static struct miscdevice psaux_mouse = {
 725         PSMOUSE_MINOR, "psaux", &mousedev_fops
 726 };
 727 static int psaux_registered;
 728 #endif
 729
 730 static int __init mousedev_init(void)
 731 {
 732         input_register_handler(&mousedev_handler);
 733
 734         memset(&mousedev_mix, 0, sizeof(struct mousedev));
 735         INIT_LIST_HEAD(&mousedev_mix.list);
 736         init_waitqueue_head(&mousedev_mix.wait);
 737         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 738         mousedev_mix.exist = 1;
 739         mousedev_mix.minor = MOUSEDEV_MIX;
 740
 741         devfs_mk_cdev(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX),
 742                         S_IFCHR|S_IRUGO|S_IWUSR, "input/mice");
 743         class_device_create(input_class,
 744                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");
 745
 746 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 747         if (!(psaux_registered = !misc_register(&psaux_mouse)))
 748                 printk(KERN_WARNING "mice: could not misc_register the device\n");
 749 #endif
 750
 751         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 752
 753         return 0;
 754 }
 755
 756 static void __exit mousedev_exit(void)
 757 {
 758 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 759         if (psaux_registered)
 760                 misc_deregister(&psaux_mouse);
 761 #endif
 762         devfs_remove("input/mice");
 763         class_device_destroy(input_class,
 764                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
 765         input_unregister_handler(&mousedev_handler);
 766 }
 767
 768 module_init(mousedev_init);
 769 module_exit(mousedev_exit);