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/random.h>
  23 #include <linux/major.h>
  24 #include <linux/device.h>
  25 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
  26 #include <linux/miscdevice.h>
  27 #endif
  28
  29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  30 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
  31 MODULE_LICENSE("GPL");
  32
  33 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
  34 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X  1024
  35 #endif
  36 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
  37 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y  768
  38 #endif
  39
  40 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
  41 module_param(xres, uint, 0644);
  42 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
  43
  44 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
  45 module_param(yres, uint, 0644);
  46 MODULE_PARM_DESC(yres, "Vertical screen resolution");
  47
  48 static unsigned tap_time = 200;
  49 module_param(tap_time, uint, 0644);
  50 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
  51
  52 struct mousedev_hw_data {
  53         int dx, dy, dz;
  54         int x, y;
  55         int abs_event;
  56         unsigned long buttons;
  57 };
  58
  59 struct mousedev {
  60         int exist;
  61         int open;
  62         int minor;
  63         char name[16];
  64         wait_queue_head_t wait;
  65         struct list_head client_list;
  66         struct input_handle handle;
  67
  68         struct list_head mixdev_node;
  69         int mixdev_open;
  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_client {
  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 static LIST_HEAD(mousedev_mix_list);
 117
 118 #define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
 119 #define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
 120
 121 static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 122 {
 123         int size, tmp;
 124         enum { FRACTION_DENOM = 128 };
 125
 126         switch (code) {
 127                 case ABS_X:
 128                         fx(0) = value;
 129                         if (mousedev->touch && mousedev->pkt_count >= 2) {
 130                                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 131                                 if (size == 0)
 132                                         size = 256 * 2;
 133                                 tmp = ((value - fx(2)) * (256 * FRACTION_DENOM)) / size;
 134                                 tmp += mousedev->frac_dx;
 135                                 mousedev->packet.dx = tmp / FRACTION_DENOM;
 136                                 mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
 137                         }
 138                         break;
 139
 140                 case ABS_Y:
 141                         fy(0) = value;
 142                         if (mousedev->touch && mousedev->pkt_count >= 2) {
 143                                 /* use X size to keep the same scale */
 144                                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 145                                 if (size == 0)
 146                                         size = 256 * 2;
 147                                 tmp = -((value - fy(2)) * (256 * FRACTION_DENOM)) / size;
 148                                 tmp += mousedev->frac_dy;
 149                                 mousedev->packet.dy = tmp / FRACTION_DENOM;
 150                                 mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
 151                         }
 152                         break;
 153         }
 154 }
 155
 156 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 157 {
 158         int size;
 159
 160         switch (code) {
 161                 case ABS_X:
 162                         size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 163                         if (size == 0)
 164                                 size = xres ? : 1;
 165                         if (value > dev->absmax[ABS_X])
 166                                 value = dev->absmax[ABS_X];
 167                         if (value < dev->absmin[ABS_X])
 168                                 value = dev->absmin[ABS_X];
 169                         mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size;
 170                         mousedev->packet.abs_event = 1;
 171                         break;
 172
 173                 case ABS_Y:
 174                         size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
 175                         if (size == 0)
 176                                 size = yres ? : 1;
 177                         if (value > dev->absmax[ABS_Y])
 178                                 value = dev->absmax[ABS_Y];
 179                         if (value < dev->absmin[ABS_Y])
 180                                 value = dev->absmin[ABS_Y];
 181                         mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size;
 182                         mousedev->packet.abs_event = 1;
 183                         break;
 184         }
 185 }
 186
 187 static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
 188 {
 189         switch (code) {
 190                 case REL_X:     mousedev->packet.dx += value; break;
 191                 case REL_Y:     mousedev->packet.dy -= value; break;
 192                 case REL_WHEEL: mousedev->packet.dz -= value; break;
 193         }
 194 }
 195
 196 static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
 197 {
 198         int index;
 199
 200         switch (code) {
 201                 case BTN_TOUCH:
 202                 case BTN_0:
 203                 case BTN_LEFT:          index = 0; break;
 204                 case BTN_STYLUS:
 205                 case BTN_1:
 206                 case BTN_RIGHT:         index = 1; break;
 207                 case BTN_2:
 208                 case BTN_FORWARD:
 209                 case BTN_STYLUS2:
 210                 case BTN_MIDDLE:        index = 2; break;
 211                 case BTN_3:
 212                 case BTN_BACK:
 213                 case BTN_SIDE:          index = 3; break;
 214                 case BTN_4:
 215                 case BTN_EXTRA:         index = 4; break;
 216                 default:                return;
 217         }
 218
 219         if (value) {
 220                 set_bit(index, &mousedev->packet.buttons);
 221                 set_bit(index, &mousedev_mix.packet.buttons);
 222         } else {
 223                 clear_bit(index, &mousedev->packet.buttons);
 224                 clear_bit(index, &mousedev_mix.packet.buttons);
 225         }
 226 }
 227
 228 static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet)
 229 {
 230         struct mousedev_client *client;
 231         struct mousedev_motion *p;
 232         unsigned long flags;
 233         int wake_readers = 0;
 234
 235         list_for_each_entry(client, &mousedev->client_list, node) {
 236                 spin_lock_irqsave(&client->packet_lock, flags);
 237
 238                 p = &client->packets[client->head];
 239                 if (client->ready && p->buttons != mousedev->packet.buttons) {
 240                         unsigned int new_head = (client->head + 1) % PACKET_QUEUE_LEN;
 241                         if (new_head != client->tail) {
 242                                 p = &client->packets[client->head = new_head];
 243                                 memset(p, 0, sizeof(struct mousedev_motion));
 244                         }
 245                 }
 246
 247                 if (packet->abs_event) {
 248                         p->dx += packet->x - client->pos_x;
 249                         p->dy += packet->y - client->pos_y;
 250                         client->pos_x = packet->x;
 251                         client->pos_y = packet->y;
 252                 }
 253
 254                 client->pos_x += packet->dx;
 255                 client->pos_x = client->pos_x < 0 ? 0 : (client->pos_x >= xres ? xres : client->pos_x);
 256                 client->pos_y += packet->dy;
 257                 client->pos_y = client->pos_y < 0 ? 0 : (client->pos_y >= yres ? yres : client->pos_y);
 258
 259                 p->dx += packet->dx;
 260                 p->dy += packet->dy;
 261                 p->dz += packet->dz;
 262                 p->buttons = mousedev->packet.buttons;
 263
 264                 if (p->dx || p->dy || p->dz || p->buttons != client->last_buttons)
 265                         client->ready = 1;
 266
 267                 spin_unlock_irqrestore(&client->packet_lock, flags);
 268
 269                 if (client->ready) {
 270                         kill_fasync(&client->fasync, SIGIO, POLL_IN);
 271                         wake_readers = 1;
 272                 }
 273         }
 274
 275         if (wake_readers)
 276                 wake_up_interruptible(&mousedev->wait);
 277 }
 278
 279 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
 280 {
 281         if (!value) {
 282                 if (mousedev->touch &&
 283                     time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) {
 284                         /*
 285                          * Toggle left button to emulate tap.
 286                          * We rely on the fact that mousedev_mix always has 0
 287                          * motion packet so we won't mess current position.
 288                          */
 289                         set_bit(0, &mousedev->packet.buttons);
 290                         set_bit(0, &mousedev_mix.packet.buttons);
 291                         mousedev_notify_readers(mousedev, &mousedev_mix.packet);
 292                         mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet);
 293                         clear_bit(0, &mousedev->packet.buttons);
 294                         clear_bit(0, &mousedev_mix.packet.buttons);
 295                 }
 296                 mousedev->touch = mousedev->pkt_count = 0;
 297                 mousedev->frac_dx = 0;
 298                 mousedev->frac_dy = 0;
 299
 300         } else if (!mousedev->touch)
 301                 mousedev->touch = jiffies;
 302 }
 303
 304 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 305 {
 306         struct mousedev *mousedev = handle->private;
 307
 308         switch (type) {
 309                 case EV_ABS:
 310                         /* Ignore joysticks */
 311                         if (test_bit(BTN_TRIGGER, handle->dev->keybit))
 312                                 return;
 313
 314                         if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 315                                 mousedev_touchpad_event(handle->dev, mousedev, code, value);
 316                         else
 317                                 mousedev_abs_event(handle->dev, mousedev, code, value);
 318
 319                         break;
 320
 321                 case EV_REL:
 322                         mousedev_rel_event(mousedev, code, value);
 323                         break;
 324
 325                 case EV_KEY:
 326                         if (value != 2) {
 327                                 if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 328                                         mousedev_touchpad_touch(mousedev, value);
 329                                 else
 330                                         mousedev_key_event(mousedev, code, value);
 331                         }
 332                         break;
 333
 334                 case EV_SYN:
 335                         if (code == SYN_REPORT) {
 336                                 if (mousedev->touch) {
 337                                         mousedev->pkt_count++;
 338                                         /* Input system eats duplicate events, but we need all of them
 339                                          * to do correct averaging so apply present one forward
 340                                          */
 341                                         fx(0) = fx(1);
 342                                         fy(0) = fy(1);
 343                                 }
 344
 345                                 mousedev_notify_readers(mousedev, &mousedev->packet);
 346                                 mousedev_notify_readers(&mousedev_mix, &mousedev->packet);
 347
 348                                 mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0;
 349                                 mousedev->packet.abs_event = 0;
 350                         }
 351                         break;
 352         }
 353 }
 354
 355 static int mousedev_fasync(int fd, struct file *file, int on)
 356 {
 357         int retval;
 358         struct mousedev_client *client = file->private_data;
 359
 360         retval = fasync_helper(fd, file, on, &client->fasync);
 361
 362         return retval < 0 ? retval : 0;
 363 }
 364
 365 static void mousedev_free(struct mousedev *mousedev)
 366 {
 367         mousedev_table[mousedev->minor] = NULL;
 368         kfree(mousedev);
 369 }
 370
 371 static int mixdev_add_device(struct mousedev *mousedev)
 372 {
 373         int error;
 374
 375         if (mousedev_mix.open) {
 376                 error = input_open_device(&mousedev->handle);
 377                 if (error)
 378                         return error;
 379
 380                 mousedev->open++;
 381                 mousedev->mixdev_open++;
 382         }
 383
 384         list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
 385
 386         return 0;
 387 }
 388
 389 static void mixdev_remove_device(struct mousedev *mousedev)
 390 {
 391         if (mousedev->mixdev_open) {
 392                 mousedev->mixdev_open = 0;
 393                 if (!--mousedev->open && mousedev->exist)
 394                         input_close_device(&mousedev->handle);
 395         }
 396
 397         list_del_init(&mousedev->mixdev_node);
 398 }
 399
 400 static void mixdev_open_devices(void)
 401 {
 402         struct mousedev *mousedev;
 403
 404         list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
 405                 if (mousedev->exist && !mousedev->open) {
 406                         if (input_open_device(&mousedev->handle))
 407                                 continue;
 408
 409                         mousedev->open++;
 410                         mousedev->mixdev_open++;
 411                 }
 412         }
 413 }
 414
 415 static void mixdev_close_devices(void)
 416 {
 417         struct mousedev *mousedev, *next;
 418
 419         list_for_each_entry_safe(mousedev, next, &mousedev_mix_list, mixdev_node) {
 420                 if (mousedev->mixdev_open) {
 421                         mousedev->mixdev_open = 0;
 422                         if (!--mousedev->open) {
 423                                 if (mousedev->exist)
 424                                         input_close_device(&mousedev->handle);
 425                                 else
 426                                         mousedev_free(mousedev);
 427                         }
 428                 }
 429         }
 430 }
 431
 432 static int mousedev_release(struct inode *inode, struct file *file)
 433 {
 434         struct mousedev_client *client = file->private_data;
 435         struct mousedev *mousedev = client->mousedev;
 436
 437         mousedev_fasync(-1, file, 0);
 438
 439         list_del(&client->node);
 440         kfree(client);
 441
 442         if (!--mousedev->open) {
 443                 if (mousedev->minor == MOUSEDEV_MIX)
 444                         mixdev_close_devices();
 445                 else if (mousedev->exist)
 446                         input_close_device(&mousedev->handle);
 447                 else
 448                         mousedev_free(mousedev);
 449         }
 450
 451         return 0;
 452 }
 453
 454
 455 static int mousedev_open(struct inode *inode, struct file *file)
 456 {
 457         struct mousedev_client *client;
 458         struct mousedev *mousedev;
 459         int error;
 460         int i;
 461
 462 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 463         if (imajor(inode) == MISC_MAJOR)
 464                 i = MOUSEDEV_MIX;
 465         else
 466 #endif
 467                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
 468
 469         if (i >= MOUSEDEV_MINORS)
 470                 return -ENODEV;
 471
 472         mousedev = mousedev_table[i];
 473         if (!mousedev)
 474                 return -ENODEV;
 475
 476         client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
 477         if (!client)
 478                 return -ENOMEM;
 479
 480         spin_lock_init(&client->packet_lock);
 481         client->pos_x = xres / 2;
 482         client->pos_y = yres / 2;
 483         client->mousedev = mousedev;
 484         list_add_tail(&client->node, &mousedev->client_list);
 485
 486         if (!mousedev->open++) {
 487                 if (mousedev->minor == MOUSEDEV_MIX)
 488                         mixdev_open_devices();
 489                 else if (mousedev->exist) {
 490                         error = input_open_device(&mousedev->handle);
 491                         if (error) {
 492                                 list_del(&client->node);
 493                                 kfree(client);
 494                                 return error;
 495                         }
 496                 }
 497         }
 498
 499         file->private_data = client;
 500         return 0;
 501 }
 502
 503 static inline int mousedev_limit_delta(int delta, int limit)
 504 {
 505         return delta > limit ? limit : (delta < -limit ? -limit : delta);
 506 }
 507
 508 static void mousedev_packet(struct mousedev_client *client, signed char *ps2_data)
 509 {
 510         struct mousedev_motion *p;
 511         unsigned long flags;
 512
 513         spin_lock_irqsave(&client->packet_lock, flags);
 514         p = &client->packets[client->tail];
 515
 516         ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
 517         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
 518         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
 519         p->dx -= ps2_data[1];
 520         p->dy -= ps2_data[2];
 521
 522         switch (client->mode) {
 523                 case MOUSEDEV_EMUL_EXPS:
 524                         ps2_data[3] = mousedev_limit_delta(p->dz, 7);
 525                         p->dz -= ps2_data[3];
 526                         ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
 527                         client->bufsiz = 4;
 528                         break;
 529
 530                 case MOUSEDEV_EMUL_IMPS:
 531                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 532                         ps2_data[3] = mousedev_limit_delta(p->dz, 127);
 533                         p->dz -= ps2_data[3];
 534                         client->bufsiz = 4;
 535                         break;
 536
 537                 case MOUSEDEV_EMUL_PS2:
 538                 default:
 539                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 540                         p->dz = 0;
 541                         client->bufsiz = 3;
 542                         break;
 543         }
 544
 545         if (!p->dx && !p->dy && !p->dz) {
 546                 if (client->tail == client->head) {
 547                         client->ready = 0;
 548                         client->last_buttons = p->buttons;
 549                 } else
 550                         client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
 551         }
 552
 553         spin_unlock_irqrestore(&client->packet_lock, flags);
 554 }
 555
 556
 557 static ssize_t mousedev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 558 {
 559         struct mousedev_client *client = file->private_data;
 560         unsigned char c;
 561         unsigned int i;
 562
 563         for (i = 0; i < count; i++) {
 564
 565                 if (get_user(c, buffer + i))
 566                         return -EFAULT;
 567
 568                 if (c == mousedev_imex_seq[client->imexseq]) {
 569                         if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
 570                                 client->imexseq = 0;
 571                                 client->mode = MOUSEDEV_EMUL_EXPS;
 572                         }
 573                 } else
 574                         client->imexseq = 0;
 575
 576                 if (c == mousedev_imps_seq[client->impsseq]) {
 577                         if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
 578                                 client->impsseq = 0;
 579                                 client->mode = MOUSEDEV_EMUL_IMPS;
 580                         }
 581                 } else
 582                         client->impsseq = 0;
 583
 584                 client->ps2[0] = 0xfa;
 585
 586                 switch (c) {
 587
 588                         case 0xeb: /* Poll */
 589                                 mousedev_packet(client, &client->ps2[1]);
 590                                 client->bufsiz++; /* account for leading ACK */
 591                                 break;
 592
 593                         case 0xf2: /* Get ID */
 594                                 switch (client->mode) {
 595                                         case MOUSEDEV_EMUL_PS2:  client->ps2[1] = 0; break;
 596                                         case MOUSEDEV_EMUL_IMPS: client->ps2[1] = 3; break;
 597                                         case MOUSEDEV_EMUL_EXPS: client->ps2[1] = 4; break;
 598                                 }
 599                                 client->bufsiz = 2;
 600                                 break;
 601
 602                         case 0xe9: /* Get info */
 603                                 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
 604                                 client->bufsiz = 4;
 605                                 break;
 606
 607                         case 0xff: /* Reset */
 608                                 client->impsseq = client->imexseq = 0;
 609                                 client->mode = MOUSEDEV_EMUL_PS2;
 610                                 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
 611                                 client->bufsiz = 3;
 612                                 break;
 613
 614                         default:
 615                                 client->bufsiz = 1;
 616                                 break;
 617                 }
 618
 619                 client->buffer = client->bufsiz;
 620         }
 621
 622         kill_fasync(&client->fasync, SIGIO, POLL_IN);
 623
 624         wake_up_interruptible(&client->mousedev->wait);
 625
 626         return count;
 627 }
 628
 629 static ssize_t mousedev_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 630 {
 631         struct mousedev_client *client = file->private_data;
 632         int retval = 0;
 633
 634         if (!client->ready && !client->buffer && (file->f_flags & O_NONBLOCK))
 635                 return -EAGAIN;
 636
 637         retval = wait_event_interruptible(client->mousedev->wait,
 638                                           !client->mousedev->exist || client->ready || client->buffer);
 639
 640         if (retval)
 641                 return retval;
 642
 643         if (!client->mousedev->exist)
 644                 return -ENODEV;
 645
 646         if (!client->buffer && client->ready) {
 647                 mousedev_packet(client, client->ps2);
 648                 client->buffer = client->bufsiz;
 649         }
 650
 651         if (count > client->buffer)
 652                 count = client->buffer;
 653
 654         client->buffer -= count;
 655
 656         if (copy_to_user(buffer, client->ps2 + client->bufsiz - client->buffer - count, count))
 657                 return -EFAULT;
 658
 659         return count;
 660 }
 661
 662 /* No kernel lock - fine */
 663 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 664 {
 665         struct mousedev_client *client = file->private_data;
 666         struct mousedev *mousedev = client->mousedev;
 667
 668         poll_wait(file, &mousedev->wait, wait);
 669         return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
 670                 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
 671 }
 672
 673 static const struct file_operations mousedev_fops = {
 674         .owner =        THIS_MODULE,
 675         .read =         mousedev_read,
 676         .write =        mousedev_write,
 677         .poll =         mousedev_poll,
 678         .open =         mousedev_open,
 679         .release =      mousedev_release,
 680         .fasync =       mousedev_fasync,
 681 };
 682
 683 static int mousedev_connect(struct input_handler *handler, struct input_dev *dev,
 684                             const struct input_device_id *id)
 685 {
 686         struct mousedev *mousedev;
 687         struct class_device *cdev;
 688         dev_t devt;
 689         int minor;
 690         int error;
 691
 692         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 693         if (minor == MOUSEDEV_MINORS) {
 694                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 695                 return -ENFILE;
 696         }
 697
 698         mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
 699         if (!mousedev)
 700                 return -ENOMEM;
 701
 702         INIT_LIST_HEAD(&mousedev->client_list);
 703         INIT_LIST_HEAD(&mousedev->mixdev_node);
 704         init_waitqueue_head(&mousedev->wait);
 705
 706         mousedev->minor = minor;
 707         mousedev->exist = 1;
 708         mousedev->handle.dev = dev;
 709         mousedev->handle.name = mousedev->name;
 710         mousedev->handle.handler = handler;
 711         mousedev->handle.private = mousedev;
 712         sprintf(mousedev->name, "mouse%d", minor);
 713
 714         mousedev_table[minor] = mousedev;
 715
 716         devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
 717
 718         cdev = class_device_create(&input_class, &dev->cdev, devt,
 719                                    dev->cdev.dev, mousedev->name);
 720         if (IS_ERR(cdev)) {
 721                 error = PTR_ERR(cdev);
 722                 goto err_free_mousedev;
 723         }
 724
 725         /* temporary symlink to keep userspace happy */
 726         error = sysfs_create_link(&input_class.subsys.kobj,
 727                                   &cdev->kobj, mousedev->name);
 728         if (error)
 729                 goto err_cdev_destroy;
 730
 731         error = input_register_handle(&mousedev->handle);
 732         if (error)
 733                 goto err_remove_link;
 734
 735         error = mixdev_add_device(mousedev);
 736         if (error)
 737                 goto err_unregister_handle;
 738
 739         return 0;
 740
 741  err_unregister_handle:
 742         input_unregister_handle(&mousedev->handle);
 743  err_remove_link:
 744         sysfs_remove_link(&input_class.subsys.kobj, mousedev->name);
 745  err_cdev_destroy:
 746         class_device_destroy(&input_class, devt);
 747  err_free_mousedev:
 748         mousedev_table[minor] = NULL;
 749         kfree(mousedev);
 750         return error;
 751 }
 752
 753 static void mousedev_disconnect(struct input_handle *handle)
 754 {
 755         struct mousedev *mousedev = handle->private;
 756         struct mousedev_client *client;
 757
 758         input_unregister_handle(handle);
 759
 760         sysfs_remove_link(&input_class.subsys.kobj, mousedev->name);
 761         class_device_destroy(&input_class,
 762                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
 763         mousedev->exist = 0;
 764
 765         mixdev_remove_device(mousedev);
 766
 767         if (mousedev->open) {
 768                 input_close_device(handle);
 769                 list_for_each_entry(client, &mousedev->client_list, node)
 770                         kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 771                 wake_up_interruptible(&mousedev->wait);
 772         } else
 773                 mousedev_free(mousedev);
 774 }
 775
 776 static const struct input_device_id mousedev_ids[] = {
 777         {
 778                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 779                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 780                 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
 781                 .relbit = { BIT(REL_X) | BIT(REL_Y) },
 782         },      /* A mouse like device, at least one button, two relative axes */
 783         {
 784                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 785                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 786                 .relbit = { BIT(REL_WHEEL) },
 787         },      /* A separate scrollwheel */
 788         {
 789                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 790                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 791                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 792                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
 793         },      /* A tablet like device, at least touch detection, two absolute axes */
 794         {
 795                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 796                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 797                 .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
 798                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
 799         },      /* A touchpad */
 800
 801         { },    /* Terminating entry */
 802 };
 803
 804 MODULE_DEVICE_TABLE(input, mousedev_ids);
 805
 806 static struct input_handler mousedev_handler = {
 807         .event =        mousedev_event,
 808         .connect =      mousedev_connect,
 809         .disconnect =   mousedev_disconnect,
 810         .fops =         &mousedev_fops,
 811         .minor =        MOUSEDEV_MINOR_BASE,
 812         .name =         "mousedev",
 813         .id_table =     mousedev_ids,
 814 };
 815
 816 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 817 static struct miscdevice psaux_mouse = {
 818         PSMOUSE_MINOR, "psaux", &mousedev_fops
 819 };
 820 static int psaux_registered;
 821 #endif
 822
 823 static int __init mousedev_init(void)
 824 {
 825         struct class_device *cdev;
 826         int error;
 827
 828         error = input_register_handler(&mousedev_handler);
 829         if (error)
 830                 return error;
 831
 832         memset(&mousedev_mix, 0, sizeof(struct mousedev));
 833         INIT_LIST_HEAD(&mousedev_mix.client_list);
 834         init_waitqueue_head(&mousedev_mix.wait);
 835         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 836         mousedev_mix.exist = 1;
 837         mousedev_mix.minor = MOUSEDEV_MIX;
 838
 839         cdev = class_device_create(&input_class, NULL,
 840                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");
 841         if (IS_ERR(cdev)) {
 842                 input_unregister_handler(&mousedev_handler);
 843                 return PTR_ERR(cdev);
 844         }
 845
 846 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 847         error = misc_register(&psaux_mouse);
 848         if (error)
 849                 printk(KERN_WARNING "mice: could not register psaux device, "
 850                         "error: %d\n", error);
 851         else
 852                 psaux_registered = 1;
 853 #endif
 854
 855         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 856
 857         return 0;
 858 }
 859
 860 static void __exit mousedev_exit(void)
 861 {
 862 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 863         if (psaux_registered)
 864                 misc_deregister(&psaux_mouse);
 865 #endif
 866         class_device_destroy(&input_class,
 867                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
 868         input_unregister_handler(&mousedev_handler);
 869 }
 870
 871 module_init(mousedev_init);
 872 module_exit(mousedev_exit);