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         struct device dev;
  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 device *dev)
 367 {
 368         struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
 369
 370         mousedev_table[mousedev->minor] = NULL;
 371         kfree(mousedev);
 372 }
 373
 374 static int mixdev_add_device(struct mousedev *mousedev)
 375 {
 376         int error;
 377
 378         if (mousedev_mix->open) {
 379                 error = input_open_device(&mousedev->handle);
 380                 if (error)
 381                         return error;
 382
 383                 mousedev->open++;
 384                 mousedev->mixdev_open = 1;
 385         }
 386
 387         get_device(&mousedev->dev);
 388         list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
 389
 390         return 0;
 391 }
 392
 393 static void mixdev_remove_device(struct mousedev *mousedev)
 394 {
 395         if (mousedev->mixdev_open) {
 396                 mousedev->mixdev_open = 0;
 397                 if (!--mousedev->open && mousedev->exist)
 398                         input_close_device(&mousedev->handle);
 399         }
 400
 401         list_del_init(&mousedev->mixdev_node);
 402         put_device(&mousedev->dev);
 403 }
 404
 405 static void mixdev_open_devices(void)
 406 {
 407         struct mousedev *mousedev;
 408
 409         if (mousedev_mix->open++)
 410                 return;
 411
 412         list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
 413                 if (!mousedev->mixdev_open) {
 414                         if (!mousedev->open && mousedev->exist)
 415                                 if (input_open_device(&mousedev->handle))
 416                                         continue;
 417
 418                         mousedev->open++;
 419                         mousedev->mixdev_open = 1;
 420                 }
 421         }
 422 }
 423
 424 static void mixdev_close_devices(void)
 425 {
 426         struct mousedev *mousedev;
 427
 428         if (--mousedev_mix->open)
 429                 return;
 430
 431         list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
 432                 if (mousedev->mixdev_open) {
 433                         mousedev->mixdev_open = 0;
 434                         if (!--mousedev->open && mousedev->exist)
 435                                 input_close_device(&mousedev->handle);
 436                 }
 437         }
 438 }
 439
 440 static int mousedev_release(struct inode *inode, struct file *file)
 441 {
 442         struct mousedev_client *client = file->private_data;
 443         struct mousedev *mousedev = client->mousedev;
 444
 445         mousedev_fasync(-1, file, 0);
 446
 447         list_del(&client->node);
 448         kfree(client);
 449
 450         if (mousedev->minor == MOUSEDEV_MIX)
 451                 mixdev_close_devices();
 452         else if (!--mousedev->open && mousedev->exist)
 453                 input_close_device(&mousedev->handle);
 454
 455         put_device(&mousedev->dev);
 456
 457         return 0;
 458 }
 459
 460
 461 static int mousedev_open(struct inode *inode, struct file *file)
 462 {
 463         struct mousedev_client *client;
 464         struct mousedev *mousedev;
 465         int error;
 466         int i;
 467
 468 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 469         if (imajor(inode) == MISC_MAJOR)
 470                 i = MOUSEDEV_MIX;
 471         else
 472 #endif
 473                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
 474
 475         if (i >= MOUSEDEV_MINORS)
 476                 return -ENODEV;
 477
 478         mousedev = mousedev_table[i];
 479         if (!mousedev)
 480                 return -ENODEV;
 481
 482         get_device(&mousedev->dev);
 483
 484         client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
 485         if (!client) {
 486                 error = -ENOMEM;
 487                 goto err_put_mousedev;
 488         }
 489
 490         spin_lock_init(&client->packet_lock);
 491         client->pos_x = xres / 2;
 492         client->pos_y = yres / 2;
 493         client->mousedev = mousedev;
 494         list_add_tail(&client->node, &mousedev->client_list);
 495
 496         if (mousedev->minor == MOUSEDEV_MIX)
 497                 mixdev_open_devices();
 498         else if (!mousedev->open++ && mousedev->exist) {
 499                 error = input_open_device(&mousedev->handle);
 500                 if (error)
 501                         goto err_free_client;
 502         }
 503
 504         file->private_data = client;
 505         return 0;
 506
 507  err_free_client:
 508         list_del(&client->node);
 509         kfree(client);
 510  err_put_mousedev:
 511         put_device(&mousedev->dev);
 512         return error;
 513 }
 514
 515 static inline int mousedev_limit_delta(int delta, int limit)
 516 {
 517         return delta > limit ? limit : (delta < -limit ? -limit : delta);
 518 }
 519
 520 static void mousedev_packet(struct mousedev_client *client, signed char *ps2_data)
 521 {
 522         struct mousedev_motion *p;
 523         unsigned long flags;
 524
 525         spin_lock_irqsave(&client->packet_lock, flags);
 526         p = &client->packets[client->tail];
 527
 528         ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
 529         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
 530         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
 531         p->dx -= ps2_data[1];
 532         p->dy -= ps2_data[2];
 533
 534         switch (client->mode) {
 535                 case MOUSEDEV_EMUL_EXPS:
 536                         ps2_data[3] = mousedev_limit_delta(p->dz, 7);
 537                         p->dz -= ps2_data[3];
 538                         ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
 539                         client->bufsiz = 4;
 540                         break;
 541
 542                 case MOUSEDEV_EMUL_IMPS:
 543                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 544                         ps2_data[3] = mousedev_limit_delta(p->dz, 127);
 545                         p->dz -= ps2_data[3];
 546                         client->bufsiz = 4;
 547                         break;
 548
 549                 case MOUSEDEV_EMUL_PS2:
 550                 default:
 551                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 552                         p->dz = 0;
 553                         client->bufsiz = 3;
 554                         break;
 555         }
 556
 557         if (!p->dx && !p->dy && !p->dz) {
 558                 if (client->tail == client->head) {
 559                         client->ready = 0;
 560                         client->last_buttons = p->buttons;
 561                 } else
 562                         client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
 563         }
 564
 565         spin_unlock_irqrestore(&client->packet_lock, flags);
 566 }
 567
 568
 569 static ssize_t mousedev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 570 {
 571         struct mousedev_client *client = file->private_data;
 572         unsigned char c;
 573         unsigned int i;
 574
 575         for (i = 0; i < count; i++) {
 576
 577                 if (get_user(c, buffer + i))
 578                         return -EFAULT;
 579
 580                 if (c == mousedev_imex_seq[client->imexseq]) {
 581                         if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
 582                                 client->imexseq = 0;
 583                                 client->mode = MOUSEDEV_EMUL_EXPS;
 584                         }
 585                 } else
 586                         client->imexseq = 0;
 587
 588                 if (c == mousedev_imps_seq[client->impsseq]) {
 589                         if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
 590                                 client->impsseq = 0;
 591                                 client->mode = MOUSEDEV_EMUL_IMPS;
 592                         }
 593                 } else
 594                         client->impsseq = 0;
 595
 596                 client->ps2[0] = 0xfa;
 597
 598                 switch (c) {
 599
 600                         case 0xeb: /* Poll */
 601                                 mousedev_packet(client, &client->ps2[1]);
 602                                 client->bufsiz++; /* account for leading ACK */
 603                                 break;
 604
 605                         case 0xf2: /* Get ID */
 606                                 switch (client->mode) {
 607                                         case MOUSEDEV_EMUL_PS2:  client->ps2[1] = 0; break;
 608                                         case MOUSEDEV_EMUL_IMPS: client->ps2[1] = 3; break;
 609                                         case MOUSEDEV_EMUL_EXPS: client->ps2[1] = 4; break;
 610                                 }
 611                                 client->bufsiz = 2;
 612                                 break;
 613
 614                         case 0xe9: /* Get info */
 615                                 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
 616                                 client->bufsiz = 4;
 617                                 break;
 618
 619                         case 0xff: /* Reset */
 620                                 client->impsseq = client->imexseq = 0;
 621                                 client->mode = MOUSEDEV_EMUL_PS2;
 622                                 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
 623                                 client->bufsiz = 3;
 624                                 break;
 625
 626                         default:
 627                                 client->bufsiz = 1;
 628                                 break;
 629                 }
 630
 631                 client->buffer = client->bufsiz;
 632         }
 633
 634         kill_fasync(&client->fasync, SIGIO, POLL_IN);
 635
 636         wake_up_interruptible(&client->mousedev->wait);
 637
 638         return count;
 639 }
 640
 641 static ssize_t mousedev_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 642 {
 643         struct mousedev_client *client = file->private_data;
 644         int retval = 0;
 645
 646         if (!client->ready && !client->buffer && (file->f_flags & O_NONBLOCK))
 647                 return -EAGAIN;
 648
 649         retval = wait_event_interruptible(client->mousedev->wait,
 650                                           !client->mousedev->exist || client->ready || client->buffer);
 651
 652         if (retval)
 653                 return retval;
 654
 655         if (!client->mousedev->exist)
 656                 return -ENODEV;
 657
 658         if (!client->buffer && client->ready) {
 659                 mousedev_packet(client, client->ps2);
 660                 client->buffer = client->bufsiz;
 661         }
 662
 663         if (count > client->buffer)
 664                 count = client->buffer;
 665
 666         client->buffer -= count;
 667
 668         if (copy_to_user(buffer, client->ps2 + client->bufsiz - client->buffer - count, count))
 669                 return -EFAULT;
 670
 671         return count;
 672 }
 673
 674 /* No kernel lock - fine */
 675 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 676 {
 677         struct mousedev_client *client = file->private_data;
 678         struct mousedev *mousedev = client->mousedev;
 679
 680         poll_wait(file, &mousedev->wait, wait);
 681         return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
 682                 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
 683 }
 684
 685 static const struct file_operations mousedev_fops = {
 686         .owner =        THIS_MODULE,
 687         .read =         mousedev_read,
 688         .write =        mousedev_write,
 689         .poll =         mousedev_poll,
 690         .open =         mousedev_open,
 691         .release =      mousedev_release,
 692         .fasync =       mousedev_fasync,
 693 };
 694
 695 static struct mousedev *mousedev_create(struct input_dev *dev,
 696                                         struct input_handler *handler,
 697                                         int minor)
 698 {
 699         struct mousedev *mousedev;
 700         int error;
 701
 702         mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
 703         if (!mousedev) {
 704                 error = -ENOMEM;
 705                 goto err_out;
 706         }
 707
 708         INIT_LIST_HEAD(&mousedev->client_list);
 709         INIT_LIST_HEAD(&mousedev->mixdev_node);
 710         init_waitqueue_head(&mousedev->wait);
 711
 712         if (minor == MOUSEDEV_MIX)
 713                 strlcpy(mousedev->name, "mice", sizeof(mousedev->name));
 714         else
 715                 snprintf(mousedev->name, sizeof(mousedev->name),
 716                          "mouse%d", minor);
 717
 718         mousedev->minor = minor;
 719         mousedev->exist = 1;
 720         mousedev->handle.dev = dev;
 721         mousedev->handle.name = mousedev->name;
 722         mousedev->handle.handler = handler;
 723         mousedev->handle.private = mousedev;
 724
 725         strlcpy(mousedev->dev.bus_id, mousedev->name,
 726                 sizeof(mousedev->dev.bus_id));
 727         mousedev->dev.class = &input_class;
 728         if (dev)
 729                 mousedev->dev.parent = &dev->dev;
 730         mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
 731         mousedev->dev.release = mousedev_free;
 732         device_initialize(&mousedev->dev);
 733
 734         mousedev_table[minor] = mousedev;
 735
 736         error = device_add(&mousedev->dev);
 737         if (error)
 738                 goto err_free_mousedev;
 739
 740         return mousedev;
 741
 742  err_free_mousedev:
 743         put_device(&mousedev->dev);
 744  err_out:
 745         return ERR_PTR(error);
 746 }
 747
 748 static void mousedev_destroy(struct mousedev *mousedev)
 749 {
 750         struct mousedev_client *client;
 751
 752         device_del(&mousedev->dev);
 753         mousedev->exist = 0;
 754
 755         if (mousedev->open) {
 756                 input_close_device(&mousedev->handle);
 757                 list_for_each_entry(client, &mousedev->client_list, node)
 758                         kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 759                 wake_up_interruptible(&mousedev->wait);
 760         }
 761
 762         put_device(&mousedev->dev);
 763 }
 764
 765 static int mousedev_connect(struct input_handler *handler, struct input_dev *dev,
 766                             const struct input_device_id *id)
 767 {
 768         struct mousedev *mousedev;
 769         int minor;
 770         int error;
 771
 772         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 773         if (minor == MOUSEDEV_MINORS) {
 774                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 775                 return -ENFILE;
 776         }
 777
 778         mousedev = mousedev_create(dev, handler, minor);
 779         if (IS_ERR(mousedev))
 780                 return PTR_ERR(mousedev);
 781
 782         error = input_register_handle(&mousedev->handle);
 783         if (error)
 784                 goto err_delete_mousedev;
 785
 786         error = mixdev_add_device(mousedev);
 787         if (error)
 788                 goto err_unregister_handle;
 789
 790         return 0;
 791
 792  err_unregister_handle:
 793         input_unregister_handle(&mousedev->handle);
 794  err_delete_mousedev:
 795         device_unregister(&mousedev->dev);
 796         return error;
 797 }
 798
 799 static void mousedev_disconnect(struct input_handle *handle)
 800 {
 801         struct mousedev *mousedev = handle->private;
 802
 803         mixdev_remove_device(mousedev);
 804         input_unregister_handle(handle);
 805         mousedev_destroy(mousedev);
 806 }
 807
 808 static const struct input_device_id mousedev_ids[] = {
 809         {
 810                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 811                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 812                 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
 813                 .relbit = { BIT(REL_X) | BIT(REL_Y) },
 814         },      /* A mouse like device, at least one button, two relative axes */
 815         {
 816                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 817                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 818                 .relbit = { BIT(REL_WHEEL) },
 819         },      /* A separate scrollwheel */
 820         {
 821                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 822                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 823                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 824                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
 825         },      /* A tablet like device, at least touch detection, two absolute axes */
 826         {
 827                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 828                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 829                 .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
 830                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
 831         },      /* A touchpad */
 832
 833         { },    /* Terminating entry */
 834 };
 835
 836 MODULE_DEVICE_TABLE(input, mousedev_ids);
 837
 838 static struct input_handler mousedev_handler = {
 839         .event =        mousedev_event,
 840         .connect =      mousedev_connect,
 841         .disconnect =   mousedev_disconnect,
 842         .fops =         &mousedev_fops,
 843         .minor =        MOUSEDEV_MINOR_BASE,
 844         .name =         "mousedev",
 845         .id_table =     mousedev_ids,
 846 };
 847
 848 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 849 static struct miscdevice psaux_mouse = {
 850         PSMOUSE_MINOR, "psaux", &mousedev_fops
 851 };
 852 static int psaux_registered;
 853 #endif
 854
 855 static int __init mousedev_init(void)
 856 {
 857         int error;
 858
 859         mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
 860         if (IS_ERR(mousedev_mix))
 861                 return PTR_ERR(mousedev_mix);
 862
 863         error = input_register_handler(&mousedev_handler);
 864         if (error) {
 865                 mousedev_destroy(mousedev_mix);
 866                 return error;
 867         }
 868
 869 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 870         error = misc_register(&psaux_mouse);
 871         if (error)
 872                 printk(KERN_WARNING "mice: could not register psaux device, "
 873                         "error: %d\n", error);
 874         else
 875                 psaux_registered = 1;
 876 #endif
 877
 878         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 879
 880         return 0;
 881 }
 882
 883 static void __exit mousedev_exit(void)
 884 {
 885 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 886         if (psaux_registered)
 887                 misc_deregister(&psaux_mouse);
 888 #endif
 889         input_unregister_handler(&mousedev_handler);
 890         mousedev_destroy(mousedev_mix);
 891 }
 892
 893 module_init(mousedev_init);
 894 module_exit(mousedev_exit);