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 client_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_client {
  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_client *client;
 227         struct mousedev_motion *p;
 228         unsigned long flags;
 229         int wake_readers = 0;
 230
 231         list_for_each_entry(client, &mousedev->client_list, node) {
 232                 spin_lock_irqsave(&client->packet_lock, flags);
 233
 234                 p = &client->packets[client->head];
 235                 if (client->ready && p->buttons != mousedev->packet.buttons) {
 236                         unsigned int new_head = (client->head + 1) % PACKET_QUEUE_LEN;
 237                         if (new_head != client->tail) {
 238                                 p = &client->packets[client->head = new_head];
 239                                 memset(p, 0, sizeof(struct mousedev_motion));
 240                         }
 241                 }
 242
 243                 if (packet->abs_event) {
 244                         p->dx += packet->x - client->pos_x;
 245                         p->dy += packet->y - client->pos_y;
 246                         client->pos_x = packet->x;
 247                         client->pos_y = packet->y;
 248                 }
 249
 250                 client->pos_x += packet->dx;
 251                 client->pos_x = client->pos_x < 0 ? 0 : (client->pos_x >= xres ? xres : client->pos_x);
 252                 client->pos_y += packet->dy;
 253                 client->pos_y = client->pos_y < 0 ? 0 : (client->pos_y >= yres ? yres : client->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 != client->last_buttons)
 261                         client->ready = 1;
 262
 263                 spin_unlock_irqrestore(&client->packet_lock, flags);
 264
 265                 if (client->ready) {
 266                         kill_fasync(&client->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_client *client = file->private_data;
 355
 356         retval = fasync_helper(fd, file, on, &client->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_client *client = file->private_data;
 386         struct mousedev *mousedev = client->mousedev;
 387
 388         mousedev_fasync(-1, file, 0);
 389
 390         list_del(&client->node);
 391         kfree(client);
 392
 393         if (!--mousedev->open) {
 394                 if (mousedev->minor == MOUSEDEV_MIX)
 395                         mixdev_release();
 396                 else if (!mousedev_mix.open) {
 397                         if (mousedev->exist)
 398                                 input_close_device(&mousedev->handle);
 399                         else
 400                                 mousedev_free(mousedev);
 401                 }
 402         }
 403
 404         return 0;
 405 }
 406
 407 static int mousedev_open(struct inode *inode, struct file *file)
 408 {
 409         struct mousedev_client *client;
 410         struct input_handle *handle;
 411         struct mousedev *mousedev;
 412         int i;
 413
 414 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 415         if (imajor(inode) == MISC_MAJOR)
 416                 i = MOUSEDEV_MIX;
 417         else
 418 #endif
 419                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
 420
 421         if (i >= MOUSEDEV_MINORS)
 422                 return -ENODEV;
 423
 424         mousedev = mousedev_table[i];
 425         if (!mousedev)
 426                 return -ENODEV;
 427
 428         client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
 429         if (!client)
 430                 return -ENOMEM;
 431
 432         spin_lock_init(&client->packet_lock);
 433         client->pos_x = xres / 2;
 434         client->pos_y = yres / 2;
 435         client->mousedev = mousedev;
 436         list_add_tail(&client->node, &mousedev->client_list);
 437
 438         if (!mousedev->open++) {
 439                 if (mousedev->minor == MOUSEDEV_MIX) {
 440                         list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 441                                 struct mousedev *md = handle->private;
 442                                 if (!md->open && md->exist)
 443                                         input_open_device(handle);
 444                         }
 445                 } else
 446                         if (!mousedev_mix.open && mousedev->exist)
 447                                 input_open_device(&mousedev->handle);
 448         }
 449
 450         file->private_data = client;
 451         return 0;
 452 }
 453
 454 static inline int mousedev_limit_delta(int delta, int limit)
 455 {
 456         return delta > limit ? limit : (delta < -limit ? -limit : delta);
 457 }
 458
 459 static void mousedev_packet(struct mousedev_client *client, signed char *ps2_data)
 460 {
 461         struct mousedev_motion *p;
 462         unsigned long flags;
 463
 464         spin_lock_irqsave(&client->packet_lock, flags);
 465         p = &client->packets[client->tail];
 466
 467         ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
 468         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
 469         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
 470         p->dx -= ps2_data[1];
 471         p->dy -= ps2_data[2];
 472
 473         switch (client->mode) {
 474                 case MOUSEDEV_EMUL_EXPS:
 475                         ps2_data[3] = mousedev_limit_delta(p->dz, 7);
 476                         p->dz -= ps2_data[3];
 477                         ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
 478                         client->bufsiz = 4;
 479                         break;
 480
 481                 case MOUSEDEV_EMUL_IMPS:
 482                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 483                         ps2_data[3] = mousedev_limit_delta(p->dz, 127);
 484                         p->dz -= ps2_data[3];
 485                         client->bufsiz = 4;
 486                         break;
 487
 488                 case MOUSEDEV_EMUL_PS2:
 489                 default:
 490                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 491                         p->dz = 0;
 492                         client->bufsiz = 3;
 493                         break;
 494         }
 495
 496         if (!p->dx && !p->dy && !p->dz) {
 497                 if (client->tail == client->head) {
 498                         client->ready = 0;
 499                         client->last_buttons = p->buttons;
 500                 } else
 501                         client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
 502         }
 503
 504         spin_unlock_irqrestore(&client->packet_lock, flags);
 505 }
 506
 507
 508 static ssize_t mousedev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 509 {
 510         struct mousedev_client *client = file->private_data;
 511         unsigned char c;
 512         unsigned int i;
 513
 514         for (i = 0; i < count; i++) {
 515
 516                 if (get_user(c, buffer + i))
 517                         return -EFAULT;
 518
 519                 if (c == mousedev_imex_seq[client->imexseq]) {
 520                         if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
 521                                 client->imexseq = 0;
 522                                 client->mode = MOUSEDEV_EMUL_EXPS;
 523                         }
 524                 } else
 525                         client->imexseq = 0;
 526
 527                 if (c == mousedev_imps_seq[client->impsseq]) {
 528                         if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
 529                                 client->impsseq = 0;
 530                                 client->mode = MOUSEDEV_EMUL_IMPS;
 531                         }
 532                 } else
 533                         client->impsseq = 0;
 534
 535                 client->ps2[0] = 0xfa;
 536
 537                 switch (c) {
 538
 539                         case 0xeb: /* Poll */
 540                                 mousedev_packet(client, &client->ps2[1]);
 541                                 client->bufsiz++; /* account for leading ACK */
 542                                 break;
 543
 544                         case 0xf2: /* Get ID */
 545                                 switch (client->mode) {
 546                                         case MOUSEDEV_EMUL_PS2:  client->ps2[1] = 0; break;
 547                                         case MOUSEDEV_EMUL_IMPS: client->ps2[1] = 3; break;
 548                                         case MOUSEDEV_EMUL_EXPS: client->ps2[1] = 4; break;
 549                                 }
 550                                 client->bufsiz = 2;
 551                                 break;
 552
 553                         case 0xe9: /* Get info */
 554                                 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
 555                                 client->bufsiz = 4;
 556                                 break;
 557
 558                         case 0xff: /* Reset */
 559                                 client->impsseq = client->imexseq = 0;
 560                                 client->mode = MOUSEDEV_EMUL_PS2;
 561                                 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
 562                                 client->bufsiz = 3;
 563                                 break;
 564
 565                         default:
 566                                 client->bufsiz = 1;
 567                                 break;
 568                 }
 569
 570                 client->buffer = client->bufsiz;
 571         }
 572
 573         kill_fasync(&client->fasync, SIGIO, POLL_IN);
 574
 575         wake_up_interruptible(&client->mousedev->wait);
 576
 577         return count;
 578 }
 579
 580 static ssize_t mousedev_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 581 {
 582         struct mousedev_client *client = file->private_data;
 583         int retval = 0;
 584
 585         if (!client->ready && !client->buffer && (file->f_flags & O_NONBLOCK))
 586                 return -EAGAIN;
 587
 588         retval = wait_event_interruptible(client->mousedev->wait,
 589                                           !client->mousedev->exist || client->ready || client->buffer);
 590
 591         if (retval)
 592                 return retval;
 593
 594         if (!client->mousedev->exist)
 595                 return -ENODEV;
 596
 597         if (!client->buffer && client->ready) {
 598                 mousedev_packet(client, client->ps2);
 599                 client->buffer = client->bufsiz;
 600         }
 601
 602         if (count > client->buffer)
 603                 count = client->buffer;
 604
 605         client->buffer -= count;
 606
 607         if (copy_to_user(buffer, client->ps2 + client->bufsiz - client->buffer - count, count))
 608                 return -EFAULT;
 609
 610         return count;
 611 }
 612
 613 /* No kernel lock - fine */
 614 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 615 {
 616         struct mousedev_client *client = file->private_data;
 617         struct mousedev *mousedev = client->mousedev;
 618
 619         poll_wait(file, &mousedev->wait, wait);
 620         return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
 621                 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
 622 }
 623
 624 static const struct file_operations mousedev_fops = {
 625         .owner =        THIS_MODULE,
 626         .read =         mousedev_read,
 627         .write =        mousedev_write,
 628         .poll =         mousedev_poll,
 629         .open =         mousedev_open,
 630         .release =      mousedev_release,
 631         .fasync =       mousedev_fasync,
 632 };
 633
 634 static int mousedev_connect(struct input_handler *handler, struct input_dev *dev,
 635                             const struct input_device_id *id)
 636 {
 637         struct mousedev *mousedev;
 638         struct class_device *cdev;
 639         dev_t devt;
 640         int minor;
 641         int error;
 642
 643         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 644         if (minor == MOUSEDEV_MINORS) {
 645                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 646                 return -ENFILE;
 647         }
 648
 649         mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
 650         if (!mousedev)
 651                 return -ENOMEM;
 652
 653         INIT_LIST_HEAD(&mousedev->client_list);
 654         INIT_LIST_HEAD(&mousedev->mixdev_node);
 655         init_waitqueue_head(&mousedev->wait);
 656
 657         mousedev->minor = minor;
 658         mousedev->exist = 1;
 659         mousedev->handle.dev = dev;
 660         mousedev->handle.name = mousedev->name;
 661         mousedev->handle.handler = handler;
 662         mousedev->handle.private = mousedev;
 663         sprintf(mousedev->name, "mouse%d", minor);
 664
 665         mousedev_table[minor] = mousedev;
 666
 667         devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
 668
 669         cdev = class_device_create(&input_class, &dev->cdev, devt,
 670                                    dev->cdev.dev, mousedev->name);
 671         if (IS_ERR(cdev)) {
 672                 error = PTR_ERR(cdev);
 673                 goto err_free_mousedev;
 674         }
 675
 676         /* temporary symlink to keep userspace happy */
 677         error = sysfs_create_link(&input_class.subsys.kset.kobj,
 678                                   &cdev->kobj, mousedev->name);
 679         if (error)
 680                 goto err_cdev_destroy;
 681
 682         error = input_register_handle(&mousedev->handle);
 683         if (error)
 684                 goto err_remove_link;
 685
 686         if (mousedev_mix.open) {
 687                 error = input_open_device(&mousedev->handle);
 688                 if (error)
 689                         goto err_unregister_handle;
 690         }
 691
 692         return 0;
 693
 694  err_unregister_handle:
 695         input_unregister_handle(&mousedev->handle);
 696  err_remove_link:
 697         sysfs_remove_link(&input_class.subsys.kset.kobj, mousedev->name);
 698  err_cdev_destroy:
 699         class_device_destroy(&input_class, devt);
 700  err_free_mousedev:
 701         mousedev_table[minor] = NULL;
 702         kfree(mousedev);
 703         return error;
 704 }
 705
 706 static void mousedev_disconnect(struct input_handle *handle)
 707 {
 708         struct mousedev *mousedev = handle->private;
 709         struct mousedev_client *client;
 710
 711         input_unregister_handle(handle);
 712
 713         sysfs_remove_link(&input_class.subsys.kset.kobj, mousedev->name);
 714         class_device_destroy(&input_class,
 715                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
 716         mousedev->exist = 0;
 717
 718         if (mousedev->open) {
 719                 input_close_device(handle);
 720                 wake_up_interruptible(&mousedev->wait);
 721                 list_for_each_entry(client, &mousedev->client_list, node)
 722                         kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 723         } else {
 724                 if (mousedev_mix.open)
 725                         input_close_device(handle);
 726                 mousedev_free(mousedev);
 727         }
 728 }
 729
 730 static const struct input_device_id mousedev_ids[] = {
 731         {
 732                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 733                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 734                 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
 735                 .relbit = { BIT(REL_X) | BIT(REL_Y) },
 736         },      /* A mouse like device, at least one button, two relative axes */
 737         {
 738                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 739                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 740                 .relbit = { BIT(REL_WHEEL) },
 741         },      /* A separate scrollwheel */
 742         {
 743                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 744                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 745                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 746                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
 747         },      /* A tablet like device, at least touch detection, two absolute axes */
 748         {
 749                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 750                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 751                 .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
 752                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
 753         },      /* A touchpad */
 754
 755         { },    /* Terminating entry */
 756 };
 757
 758 MODULE_DEVICE_TABLE(input, mousedev_ids);
 759
 760 static struct input_handler mousedev_handler = {
 761         .event =        mousedev_event,
 762         .connect =      mousedev_connect,
 763         .disconnect =   mousedev_disconnect,
 764         .fops =         &mousedev_fops,
 765         .minor =        MOUSEDEV_MINOR_BASE,
 766         .name =         "mousedev",
 767         .id_table =     mousedev_ids,
 768 };
 769
 770 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 771 static struct miscdevice psaux_mouse = {
 772         PSMOUSE_MINOR, "psaux", &mousedev_fops
 773 };
 774 static int psaux_registered;
 775 #endif
 776
 777 static int __init mousedev_init(void)
 778 {
 779         struct class_device *cdev;
 780         int error;
 781
 782         error = input_register_handler(&mousedev_handler);
 783         if (error)
 784                 return error;
 785
 786         memset(&mousedev_mix, 0, sizeof(struct mousedev));
 787         INIT_LIST_HEAD(&mousedev_mix.client_list);
 788         init_waitqueue_head(&mousedev_mix.wait);
 789         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 790         mousedev_mix.exist = 1;
 791         mousedev_mix.minor = MOUSEDEV_MIX;
 792
 793         cdev = class_device_create(&input_class, NULL,
 794                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");
 795         if (IS_ERR(cdev)) {
 796                 input_unregister_handler(&mousedev_handler);
 797                 return PTR_ERR(cdev);
 798         }
 799
 800 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 801         error = misc_register(&psaux_mouse);
 802         if (error)
 803                 printk(KERN_WARNING "mice: could not register psaux device, "
 804                         "error: %d\n", error);
 805         else
 806                 psaux_registered = 1;
 807 #endif
 808
 809         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 810
 811         return 0;
 812 }
 813
 814 static void __exit mousedev_exit(void)
 815 {
 816 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 817         if (psaux_registered)
 818                 misc_deregister(&psaux_mouse);
 819 #endif
 820         class_device_destroy(&input_class,
 821                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
 822         input_unregister_handler(&mousedev_handler);
 823 }
 824
 825 module_init(mousedev_init);
 826 module_exit(mousedev_exit);