git.oblomov.eu Git - linux-2.6/blob - 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 list_head mixdev_node;
  70         int mixdev_open;
  71
  72         struct mousedev_hw_data packet;
  73         unsigned int pkt_count;
  74         int old_x[4], old_y[4];
  75         int frac_dx, frac_dy;
  76         unsigned long touch;
  77 };
  78
  79 enum mousedev_emul {
  80         MOUSEDEV_EMUL_PS2,
  81         MOUSEDEV_EMUL_IMPS,
  82         MOUSEDEV_EMUL_EXPS
  83 };
  84
  85 struct mousedev_motion {
  86         int dx, dy, dz;
  87         unsigned long buttons;
  88 };
  89
  90 #define PACKET_QUEUE_LEN        16
  91 struct mousedev_client {
  92         struct fasync_struct *fasync;
  93         struct mousedev *mousedev;
  94         struct list_head node;
  95
  96         struct mousedev_motion packets[PACKET_QUEUE_LEN];
  97         unsigned int head, tail;
  98         spinlock_t packet_lock;
  99         int pos_x, pos_y;
 100
 101         signed char ps2[6];
 102         unsigned char ready, buffer, bufsiz;
 103         unsigned char imexseq, impsseq;
 104         enum mousedev_emul mode;
 105         unsigned long last_buttons;
 106 };
 107
 108 #define MOUSEDEV_SEQ_LEN        6
 109
 110 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
 111 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
 112
 113 static struct input_handler mousedev_handler;
 114
 115 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
 116 static struct mousedev mousedev_mix;
 117 static LIST_HEAD(mousedev_mix_list);
 118
 119 #define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
 120 #define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
 121
 122 static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 123 {
 124         int size, tmp;
 125         enum { FRACTION_DENOM = 128 };
 126
 127         switch (code) {
 128                 case ABS_X:
 129                         fx(0) = value;
 130                         if (mousedev->touch && mousedev->pkt_count >= 2) {
 131                                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 132                                 if (size == 0)
 133                                         size = 256 * 2;
 134                                 tmp = ((value - fx(2)) * (256 * FRACTION_DENOM)) / size;
 135                                 tmp += mousedev->frac_dx;
 136                                 mousedev->packet.dx = tmp / FRACTION_DENOM;
 137                                 mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
 138                         }
 139                         break;
 140
 141                 case ABS_Y:
 142                         fy(0) = value;
 143                         if (mousedev->touch && mousedev->pkt_count >= 2) {
 144                                 /* use X size to keep the same scale */
 145                                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 146                                 if (size == 0)
 147                                         size = 256 * 2;
 148                                 tmp = -((value - fy(2)) * (256 * FRACTION_DENOM)) / size;
 149                                 tmp += mousedev->frac_dy;
 150                                 mousedev->packet.dy = tmp / FRACTION_DENOM;
 151                                 mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
 152                         }
 153                         break;
 154         }
 155 }
 156
 157 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 158 {
 159         int size;
 160
 161         switch (code) {
 162                 case ABS_X:
 163                         size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 164                         if (size == 0)
 165                                 size = xres ? : 1;
 166                         if (value > dev->absmax[ABS_X])
 167                                 value = dev->absmax[ABS_X];
 168                         if (value < dev->absmin[ABS_X])
 169                                 value = dev->absmin[ABS_X];
 170                         mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size;
 171                         mousedev->packet.abs_event = 1;
 172                         break;
 173
 174                 case ABS_Y:
 175                         size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
 176                         if (size == 0)
 177                                 size = yres ? : 1;
 178                         if (value > dev->absmax[ABS_Y])
 179                                 value = dev->absmax[ABS_Y];
 180                         if (value < dev->absmin[ABS_Y])
 181                                 value = dev->absmin[ABS_Y];
 182                         mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size;
 183                         mousedev->packet.abs_event = 1;
 184                         break;
 185         }
 186 }
 187
 188 static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
 189 {
 190         switch (code) {
 191                 case REL_X:     mousedev->packet.dx += value; break;
 192                 case REL_Y:     mousedev->packet.dy -= value; break;
 193                 case REL_WHEEL: mousedev->packet.dz -= value; break;
 194         }
 195 }
 196
 197 static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
 198 {
 199         int index;
 200
 201         switch (code) {
 202                 case BTN_TOUCH:
 203                 case BTN_0:
 204                 case BTN_LEFT:          index = 0; break;
 205                 case BTN_STYLUS:
 206                 case BTN_1:
 207                 case BTN_RIGHT:         index = 1; break;
 208                 case BTN_2:
 209                 case BTN_FORWARD:
 210                 case BTN_STYLUS2:
 211                 case BTN_MIDDLE:        index = 2; break;
 212                 case BTN_3:
 213                 case BTN_BACK:
 214                 case BTN_SIDE:          index = 3; break;
 215                 case BTN_4:
 216                 case BTN_EXTRA:         index = 4; break;
 217                 default:                return;
 218         }
 219
 220         if (value) {
 221                 set_bit(index, &mousedev->packet.buttons);
 222                 set_bit(index, &mousedev_mix.packet.buttons);
 223         } else {
 224                 clear_bit(index, &mousedev->packet.buttons);
 225                 clear_bit(index, &mousedev_mix.packet.buttons);
 226         }
 227 }
 228
 229 static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet)
 230 {
 231         struct mousedev_client *client;
 232         struct mousedev_motion *p;
 233         unsigned long flags;
 234         int wake_readers = 0;
 235
 236         list_for_each_entry(client, &mousedev->client_list, node) {
 237                 spin_lock_irqsave(&client->packet_lock, flags);
 238
 239                 p = &client->packets[client->head];
 240                 if (client->ready && p->buttons != mousedev->packet.buttons) {
 241                         unsigned int new_head = (client->head + 1) % PACKET_QUEUE_LEN;
 242                         if (new_head != client->tail) {
 243                                 p = &client->packets[client->head = new_head];
 244                                 memset(p, 0, sizeof(struct mousedev_motion));
 245                         }
 246                 }
 247
 248                 if (packet->abs_event) {
 249                         p->dx += packet->x - client->pos_x;
 250                         p->dy += packet->y - client->pos_y;
 251                         client->pos_x = packet->x;
 252                         client->pos_y = packet->y;
 253                 }
 254
 255                 client->pos_x += packet->dx;
 256                 client->pos_x = client->pos_x < 0 ? 0 : (client->pos_x >= xres ? xres : client->pos_x);
 257                 client->pos_y += packet->dy;
 258                 client->pos_y = client->pos_y < 0 ? 0 : (client->pos_y >= yres ? yres : client->pos_y);
 259
 260                 p->dx += packet->dx;
 261                 p->dy += packet->dy;
 262                 p->dz += packet->dz;
 263                 p->buttons = mousedev->packet.buttons;
 264
 265                 if (p->dx || p->dy || p->dz || p->buttons != client->last_buttons)
 266                         client->ready = 1;
 267
 268                 spin_unlock_irqrestore(&client->packet_lock, flags);
 269
 270                 if (client->ready) {
 271                         kill_fasync(&client->fasync, SIGIO, POLL_IN);
 272                         wake_readers = 1;
 273                 }
 274         }
 275
 276         if (wake_readers)
 277                 wake_up_interruptible(&mousedev->wait);
 278 }
 279
 280 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
 281 {
 282         if (!value) {
 283                 if (mousedev->touch &&
 284                     time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) {
 285                         /*
 286                          * Toggle left button to emulate tap.
 287                          * We rely on the fact that mousedev_mix always has 0
 288                          * motion packet so we won't mess current position.
 289                          */
 290                         set_bit(0, &mousedev->packet.buttons);
 291                         set_bit(0, &mousedev_mix.packet.buttons);
 292                         mousedev_notify_readers(mousedev, &mousedev_mix.packet);
 293                         mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet);
 294                         clear_bit(0, &mousedev->packet.buttons);
 295                         clear_bit(0, &mousedev_mix.packet.buttons);
 296                 }
 297                 mousedev->touch = mousedev->pkt_count = 0;
 298                 mousedev->frac_dx = 0;
 299                 mousedev->frac_dy = 0;
 300
 301         } else if (!mousedev->touch)
 302                 mousedev->touch = jiffies;
 303 }
 304
 305 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 306 {
 307         struct mousedev *mousedev = handle->private;
 308
 309         switch (type) {
 310                 case EV_ABS:
 311                         /* Ignore joysticks */
 312                         if (test_bit(BTN_TRIGGER, handle->dev->keybit))
 313                                 return;
 314
 315                         if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 316                                 mousedev_touchpad_event(handle->dev, mousedev, code, value);
 317                         else
 318                                 mousedev_abs_event(handle->dev, mousedev, code, value);
 319
 320                         break;
 321
 322                 case EV_REL:
 323                         mousedev_rel_event(mousedev, code, value);
 324                         break;
 325
 326                 case EV_KEY:
 327                         if (value != 2) {
 328                                 if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 329                                         mousedev_touchpad_touch(mousedev, value);
 330                                 else
 331                                         mousedev_key_event(mousedev, code, value);
 332                         }
 333                         break;
 334
 335                 case EV_SYN:
 336                         if (code == SYN_REPORT) {
 337                                 if (mousedev->touch) {
 338                                         mousedev->pkt_count++;
 339                                         /* Input system eats duplicate events, but we need all of them
 340                                          * to do correct averaging so apply present one forward
 341                                          */
 342                                         fx(0) = fx(1);
 343                                         fy(0) = fy(1);
 344                                 }
 345
 346                                 mousedev_notify_readers(mousedev, &mousedev->packet);
 347                                 mousedev_notify_readers(&mousedev_mix, &mousedev->packet);
 348
 349                                 mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0;
 350                                 mousedev->packet.abs_event = 0;
 351                         }
 352                         break;
 353         }
 354 }
 355
 356 static int mousedev_fasync(int fd, struct file *file, int on)
 357 {
 358         int retval;
 359         struct mousedev_client *client = file->private_data;
 360
 361         retval = fasync_helper(fd, file, on, &client->fasync);
 362
 363         return retval < 0 ? retval : 0;
 364 }
 365
 366 static void mousedev_free(struct mousedev *mousedev)
 367 {
 368         mousedev_table[mousedev->minor] = NULL;
 369         kfree(mousedev);
 370 }
 371
 372 static int mixdev_add_device(struct mousedev *mousedev)
 373 {
 374         int error;
 375
 376         if (mousedev_mix.open) {
 377                 error = input_open_device(&mousedev->handle);
 378                 if (error)
 379                         return error;
 380
 381                 mousedev->open++;
 382                 mousedev->mixdev_open++;
 383         }
 384
 385         list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
 386
 387         return 0;
 388 }
 389
 390 static void mixdev_remove_device(struct mousedev *mousedev)
 391 {
 392         if (mousedev->mixdev_open) {
 393                 mousedev->mixdev_open = 0;
 394                 if (!--mousedev->open && mousedev->exist)
 395                         input_close_device(&mousedev->handle);
 396         }
 397
 398         list_del_init(&mousedev->mixdev_node);
 399 }
 400
 401 static void mixdev_open_devices(void)
 402 {
 403         struct mousedev *mousedev;
 404
 405         list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
 406                 if (mousedev->exist && !mousedev->open) {
 407                         if (input_open_device(&mousedev->handle))
 408                                 continue;
 409
 410                         mousedev->open++;
 411                         mousedev->mixdev_open++;
 412                 }
 413         }
 414 }
 415
 416 static void mixdev_close_devices(void)
 417 {
 418         struct mousedev *mousedev, *next;
 419
 420         list_for_each_entry_safe(mousedev, next, &mousedev_mix_list, mixdev_node) {
 421                 if (mousedev->mixdev_open) {
 422                         mousedev->mixdev_open = 0;
 423                         if (!--mousedev->open) {
 424                                 if (mousedev->exist)
 425                                         input_close_device(&mousedev->handle);
 426                                 else
 427                                         mousedev_free(mousedev);
 428                         }
 429                 }
 430         }
 431 }
 432
 433 static int mousedev_release(struct inode *inode, struct file *file)
 434 {
 435         struct mousedev_client *client = file->private_data;
 436         struct mousedev *mousedev = client->mousedev;
 437
 438         mousedev_fasync(-1, file, 0);
 439
 440         list_del(&client->node);
 441         kfree(client);
 442
 443         if (!--mousedev->open) {
 444                 if (mousedev->minor == MOUSEDEV_MIX)
 445                         mixdev_close_devices();
 446                 else if (mousedev->exist)
 447                         input_close_device(&mousedev->handle);
 448                 else
 449                         mousedev_free(mousedev);
 450         }
 451
 452         return 0;
 453 }
 454
 455
 456 static int mousedev_open(struct inode *inode, struct file *file)
 457 {
 458         struct mousedev_client *client;
 459         struct mousedev *mousedev;
 460         int error;
 461         int i;
 462
 463 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 464         if (imajor(inode) == MISC_MAJOR)
 465                 i = MOUSEDEV_MIX;
 466         else
 467 #endif
 468                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
 469
 470         if (i >= MOUSEDEV_MINORS)
 471                 return -ENODEV;
 472
 473         mousedev = mousedev_table[i];
 474         if (!mousedev)
 475                 return -ENODEV;
 476
 477         client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
 478         if (!client)
 479                 return -ENOMEM;
 480
 481         spin_lock_init(&client->packet_lock);
 482         client->pos_x = xres / 2;
 483         client->pos_y = yres / 2;
 484         client->mousedev = mousedev;
 485         list_add_tail(&client->node, &mousedev->client_list);
 486
 487         if (!mousedev->open++) {
 488                 if (mousedev->minor == MOUSEDEV_MIX)
 489                         mixdev_open_devices();
 490                 else if (mousedev->exist) {
 491                         error = input_open_device(&mousedev->handle);
 492                         if (error) {
 493                                 list_del(&client->node);
 494                                 kfree(client);
 495                                 return error;
 496                         }
 497                 }
 498         }
 499
 500         file->private_data = client;
 501         return 0;
 502 }
 503
 504 static inline int mousedev_limit_delta(int delta, int limit)
 505 {
 506         return delta > limit ? limit : (delta < -limit ? -limit : delta);
 507 }
 508
 509 static void mousedev_packet(struct mousedev_client *client, signed char *ps2_data)
 510 {
 511         struct mousedev_motion *p;
 512         unsigned long flags;
 513
 514         spin_lock_irqsave(&client->packet_lock, flags);
 515         p = &client->packets[client->tail];
 516
 517         ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
 518         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
 519         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
 520         p->dx -= ps2_data[1];
 521         p->dy -= ps2_data[2];
 522
 523         switch (client->mode) {
 524                 case MOUSEDEV_EMUL_EXPS:
 525                         ps2_data[3] = mousedev_limit_delta(p->dz, 7);
 526                         p->dz -= ps2_data[3];
 527                         ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
 528                         client->bufsiz = 4;
 529                         break;
 530
 531                 case MOUSEDEV_EMUL_IMPS:
 532                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 533                         ps2_data[3] = mousedev_limit_delta(p->dz, 127);
 534                         p->dz -= ps2_data[3];
 535                         client->bufsiz = 4;
 536                         break;
 537
 538                 case MOUSEDEV_EMUL_PS2:
 539                 default:
 540                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 541                         p->dz = 0;
 542                         client->bufsiz = 3;
 543                         break;
 544         }
 545
 546         if (!p->dx && !p->dy && !p->dz) {
 547                 if (client->tail == client->head) {
 548                         client->ready = 0;
 549                         client->last_buttons = p->buttons;
 550                 } else
 551                         client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
 552         }
 553
 554         spin_unlock_irqrestore(&client->packet_lock, flags);
 555 }
 556
 557
 558 static ssize_t mousedev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 559 {
 560         struct mousedev_client *client = file->private_data;
 561         unsigned char c;
 562         unsigned int i;
 563
 564         for (i = 0; i < count; i++) {
 565
 566                 if (get_user(c, buffer + i))
 567                         return -EFAULT;
 568
 569                 if (c == mousedev_imex_seq[client->imexseq]) {
 570                         if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
 571                                 client->imexseq = 0;
 572                                 client->mode = MOUSEDEV_EMUL_EXPS;
 573                         }
 574                 } else
 575                         client->imexseq = 0;
 576
 577                 if (c == mousedev_imps_seq[client->impsseq]) {
 578                         if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
 579                                 client->impsseq = 0;
 580                                 client->mode = MOUSEDEV_EMUL_IMPS;
 581                         }
 582                 } else
 583                         client->impsseq = 0;
 584
 585                 client->ps2[0] = 0xfa;
 586
 587                 switch (c) {
 588
 589                         case 0xeb: /* Poll */
 590                                 mousedev_packet(client, &client->ps2[1]);
 591                                 client->bufsiz++; /* account for leading ACK */
 592                                 break;
 593
 594                         case 0xf2: /* Get ID */
 595                                 switch (client->mode) {
 596                                         case MOUSEDEV_EMUL_PS2:  client->ps2[1] = 0; break;
 597                                         case MOUSEDEV_EMUL_IMPS: client->ps2[1] = 3; break;
 598                                         case MOUSEDEV_EMUL_EXPS: client->ps2[1] = 4; break;
 599                                 }
 600                                 client->bufsiz = 2;
 601                                 break;
 602
 603                         case 0xe9: /* Get info */
 604                                 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
 605                                 client->bufsiz = 4;
 606                                 break;
 607
 608                         case 0xff: /* Reset */
 609                                 client->impsseq = client->imexseq = 0;
 610                                 client->mode = MOUSEDEV_EMUL_PS2;
 611                                 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
 612                                 client->bufsiz = 3;
 613                                 break;
 614
 615                         default:
 616                                 client->bufsiz = 1;
 617                                 break;
 618                 }
 619
 620                 client->buffer = client->bufsiz;
 621         }
 622
 623         kill_fasync(&client->fasync, SIGIO, POLL_IN);
 624
 625         wake_up_interruptible(&client->mousedev->wait);
 626
 627         return count;
 628 }
 629
 630 static ssize_t mousedev_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 631 {
 632         struct mousedev_client *client = file->private_data;
 633         int retval = 0;
 634
 635         if (!client->ready && !client->buffer && (file->f_flags & O_NONBLOCK))
 636                 return -EAGAIN;
 637
 638         retval = wait_event_interruptible(client->mousedev->wait,
 639                                           !client->mousedev->exist || client->ready || client->buffer);
 640
 641         if (retval)
 642                 return retval;
 643
 644         if (!client->mousedev->exist)
 645                 return -ENODEV;
 646
 647         if (!client->buffer && client->ready) {
 648                 mousedev_packet(client, client->ps2);
 649                 client->buffer = client->bufsiz;
 650         }
 651
 652         if (count > client->buffer)
 653                 count = client->buffer;
 654
 655         client->buffer -= count;
 656
 657         if (copy_to_user(buffer, client->ps2 + client->bufsiz - client->buffer - count, count))
 658                 return -EFAULT;
 659
 660         return count;
 661 }
 662
 663 /* No kernel lock - fine */
 664 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 665 {
 666         struct mousedev_client *client = file->private_data;
 667         struct mousedev *mousedev = client->mousedev;
 668
 669         poll_wait(file, &mousedev->wait, wait);
 670         return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
 671                 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
 672 }
 673
 674 static const struct file_operations mousedev_fops = {
 675         .owner =        THIS_MODULE,
 676         .read =         mousedev_read,
 677         .write =        mousedev_write,
 678         .poll =         mousedev_poll,
 679         .open =         mousedev_open,
 680         .release =      mousedev_release,
 681         .fasync =       mousedev_fasync,
 682 };
 683
 684 static int mousedev_connect(struct input_handler *handler, struct input_dev *dev,
 685                             const struct input_device_id *id)
 686 {
 687         struct mousedev *mousedev;
 688         struct class_device *cdev;
 689         dev_t devt;
 690         int minor;
 691         int error;
 692
 693         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 694         if (minor == MOUSEDEV_MINORS) {
 695                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 696                 return -ENFILE;
 697         }
 698
 699         mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
 700         if (!mousedev)
 701                 return -ENOMEM;
 702
 703         INIT_LIST_HEAD(&mousedev->client_list);
 704         INIT_LIST_HEAD(&mousedev->mixdev_node);
 705         init_waitqueue_head(&mousedev->wait);
 706
 707         mousedev->minor = minor;
 708         mousedev->exist = 1;
 709         mousedev->handle.dev = dev;
 710         mousedev->handle.name = mousedev->name;
 711         mousedev->handle.handler = handler;
 712         mousedev->handle.private = mousedev;
 713         sprintf(mousedev->name, "mouse%d", minor);
 714
 715         mousedev_table[minor] = mousedev;
 716
 717         devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
 718
 719         cdev = class_device_create(&input_class, &dev->cdev, devt,
 720                                    dev->cdev.dev, mousedev->name);
 721         if (IS_ERR(cdev)) {
 722                 error = PTR_ERR(cdev);
 723                 goto err_free_mousedev;
 724         }
 725
 726         /* temporary symlink to keep userspace happy */
 727         error = sysfs_create_link(&input_class.subsys.kobj,
 728                                   &cdev->kobj, mousedev->name);
 729         if (error)
 730                 goto err_cdev_destroy;
 731
 732         error = input_register_handle(&mousedev->handle);
 733         if (error)
 734                 goto err_remove_link;
 735
 736         error = mixdev_add_device(mousedev);
 737         if (error)
 738                 goto err_unregister_handle;
 739
 740         return 0;
 741
 742  err_unregister_handle:
 743         input_unregister_handle(&mousedev->handle);
 744  err_remove_link:
 745         sysfs_remove_link(&input_class.subsys.kobj, mousedev->name);
 746  err_cdev_destroy:
 747         class_device_destroy(&input_class, devt);
 748  err_free_mousedev:
 749         mousedev_table[minor] = NULL;
 750         kfree(mousedev);
 751         return error;
 752 }
 753
 754 static void mousedev_disconnect(struct input_handle *handle)
 755 {
 756         struct mousedev *mousedev = handle->private;
 757         struct mousedev_client *client;
 758
 759         input_unregister_handle(handle);
 760
 761         sysfs_remove_link(&input_class.subsys.kobj, mousedev->name);
 762         class_device_destroy(&input_class,
 763                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
 764         mousedev->exist = 0;
 765
 766         mixdev_remove_device(mousedev);
 767
 768         if (mousedev->open) {
 769                 input_close_device(handle);
 770                 wake_up_interruptible(&mousedev->wait);
 771                 list_for_each_entry(client, &mousedev->client_list, node)
 772                         kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 773         } else
 774                 mousedev_free(mousedev);
 775 }
 776
 777 static const struct input_device_id mousedev_ids[] = {
 778         {
 779                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 780                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 781                 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
 782                 .relbit = { BIT(REL_X) | BIT(REL_Y) },
 783         },      /* A mouse like device, at least one button, two relative axes */
 784         {
 785                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 786                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 787                 .relbit = { BIT(REL_WHEEL) },
 788         },      /* A separate scrollwheel */
 789         {
 790                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 791                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 792                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 793                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
 794         },      /* A tablet like device, at least touch detection, two absolute axes */
 795         {
 796                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 797                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 798                 .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
 799                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
 800         },      /* A touchpad */
 801
 802         { },    /* Terminating entry */
 803 };
 804
 805 MODULE_DEVICE_TABLE(input, mousedev_ids);
 806
 807 static struct input_handler mousedev_handler = {
 808         .event =        mousedev_event,
 809         .connect =      mousedev_connect,
 810         .disconnect =   mousedev_disconnect,
 811         .fops =         &mousedev_fops,
 812         .minor =        MOUSEDEV_MINOR_BASE,
 813         .name =         "mousedev",
 814         .id_table =     mousedev_ids,
 815 };
 816
 817 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 818 static struct miscdevice psaux_mouse = {
 819         PSMOUSE_MINOR, "psaux", &mousedev_fops
 820 };
 821 static int psaux_registered;
 822 #endif
 823
 824 static int __init mousedev_init(void)
 825 {
 826         struct class_device *cdev;
 827         int error;
 828
 829         error = input_register_handler(&mousedev_handler);
 830         if (error)
 831                 return error;
 832
 833         memset(&mousedev_mix, 0, sizeof(struct mousedev));
 834         INIT_LIST_HEAD(&mousedev_mix.client_list);
 835         init_waitqueue_head(&mousedev_mix.wait);
 836         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 837         mousedev_mix.exist = 1;
 838         mousedev_mix.minor = MOUSEDEV_MIX;
 839
 840         cdev = class_device_create(&input_class, NULL,
 841                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");
 842         if (IS_ERR(cdev)) {
 843                 input_unregister_handler(&mousedev_handler);
 844                 return PTR_ERR(cdev);
 845         }
 846
 847 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 848         error = misc_register(&psaux_mouse);
 849         if (error)
 850                 printk(KERN_WARNING "mice: could not register psaux device, "
 851                         "error: %d\n", error);
 852         else
 853                 psaux_registered = 1;
 854 #endif
 855
 856         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 857
 858         return 0;
 859 }
 860
 861 static void __exit mousedev_exit(void)
 862 {
 863 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 864         if (psaux_registered)
 865                 misc_deregister(&psaux_mouse);
 866 #endif
 867         class_device_destroy(&input_class,
 868                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
 869         input_unregister_handler(&mousedev_handler);
 870 }
 871
 872 module_init(mousedev_init);
 873 module_exit(mousedev_exit);