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/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/poll.h>
  19 #include <linux/module.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         struct input_handle handle;
  64         wait_queue_head_t wait;
  65         struct list_head client_list;
  66         spinlock_t client_lock; /* protects client_list */
  67         struct mutex mutex;
  68         struct device dev;
  69
  70         struct list_head mixdev_node;
  71         int mixdev_open;
  72
  73         struct mousedev_hw_data packet;
  74         unsigned int pkt_count;
  75         int old_x[4], old_y[4];
  76         int frac_dx, frac_dy;
  77         unsigned long touch;
  78 };
  79
  80 enum mousedev_emul {
  81         MOUSEDEV_EMUL_PS2,
  82         MOUSEDEV_EMUL_IMPS,
  83         MOUSEDEV_EMUL_EXPS
  84 };
  85
  86 struct mousedev_motion {
  87         int dx, dy, dz;
  88         unsigned long buttons;
  89 };
  90
  91 #define PACKET_QUEUE_LEN        16
  92 struct mousedev_client {
  93         struct fasync_struct *fasync;
  94         struct mousedev *mousedev;
  95         struct list_head node;
  96
  97         struct mousedev_motion packets[PACKET_QUEUE_LEN];
  98         unsigned int head, tail;
  99         spinlock_t packet_lock;
 100         int pos_x, pos_y;
 101
 102         signed char ps2[6];
 103         unsigned char ready, buffer, bufsiz;
 104         unsigned char imexseq, impsseq;
 105         enum mousedev_emul mode;
 106         unsigned long last_buttons;
 107 };
 108
 109 #define MOUSEDEV_SEQ_LEN        6
 110
 111 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
 112 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
 113
 114 static struct input_handler mousedev_handler;
 115
 116 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
 117 static DEFINE_MUTEX(mousedev_table_mutex);
 118 static struct mousedev *mousedev_mix;
 119 static LIST_HEAD(mousedev_mix_list);
 120
 121 static void mixdev_open_devices(void);
 122 static void mixdev_close_devices(void);
 123
 124 #define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
 125 #define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
 126
 127 static void mousedev_touchpad_event(struct input_dev *dev,
 128                                     struct mousedev *mousedev,
 129                                     unsigned int code, int value)
 130 {
 131         int size, tmp;
 132         enum { FRACTION_DENOM = 128 };
 133
 134         switch (code) {
 135
 136         case ABS_X:
 137                 fx(0) = value;
 138                 if (mousedev->touch && mousedev->pkt_count >= 2) {
 139                         size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 140                         if (size == 0)
 141                                 size = 256 * 2;
 142                         tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
 143                         tmp += mousedev->frac_dx;
 144                         mousedev->packet.dx = tmp / FRACTION_DENOM;
 145                         mousedev->frac_dx =
 146                                 tmp - mousedev->packet.dx * FRACTION_DENOM;
 147                 }
 148                 break;
 149
 150         case ABS_Y:
 151                 fy(0) = value;
 152                 if (mousedev->touch && mousedev->pkt_count >= 2) {
 153                         /* use X size to keep the same scale */
 154                         size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 155                         if (size == 0)
 156                                 size = 256 * 2;
 157                         tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
 158                         tmp += mousedev->frac_dy;
 159                         mousedev->packet.dy = tmp / FRACTION_DENOM;
 160                         mousedev->frac_dy = tmp -
 161                                 mousedev->packet.dy * FRACTION_DENOM;
 162                 }
 163                 break;
 164         }
 165 }
 166
 167 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
 168                                 unsigned int code, int value)
 169 {
 170         int size;
 171
 172         switch (code) {
 173
 174         case ABS_X:
 175                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 176                 if (size == 0)
 177                         size = xres ? : 1;
 178                 if (value > dev->absmax[ABS_X])
 179                         value = dev->absmax[ABS_X];
 180                 if (value < dev->absmin[ABS_X])
 181                         value = dev->absmin[ABS_X];
 182                 mousedev->packet.x =
 183                         ((value - dev->absmin[ABS_X]) * xres) / size;
 184                 mousedev->packet.abs_event = 1;
 185                 break;
 186
 187         case ABS_Y:
 188                 size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
 189                 if (size == 0)
 190                         size = yres ? : 1;
 191                 if (value > dev->absmax[ABS_Y])
 192                         value = dev->absmax[ABS_Y];
 193                 if (value < dev->absmin[ABS_Y])
 194                         value = dev->absmin[ABS_Y];
 195                 mousedev->packet.y = yres -
 196                         ((value - dev->absmin[ABS_Y]) * yres) / size;
 197                 mousedev->packet.abs_event = 1;
 198                 break;
 199         }
 200 }
 201
 202 static void mousedev_rel_event(struct mousedev *mousedev,
 203                                 unsigned int code, int value)
 204 {
 205         switch (code) {
 206         case REL_X:
 207                 mousedev->packet.dx += value;
 208                 break;
 209
 210         case REL_Y:
 211                 mousedev->packet.dy -= value;
 212                 break;
 213
 214         case REL_WHEEL:
 215                 mousedev->packet.dz -= value;
 216                 break;
 217         }
 218 }
 219
 220 static void mousedev_key_event(struct mousedev *mousedev,
 221                                 unsigned int code, int value)
 222 {
 223         int index;
 224
 225         switch (code) {
 226
 227         case BTN_TOUCH:
 228         case BTN_0:
 229         case BTN_LEFT:          index = 0; break;
 230
 231         case BTN_STYLUS:
 232         case BTN_1:
 233         case BTN_RIGHT:         index = 1; break;
 234
 235         case BTN_2:
 236         case BTN_FORWARD:
 237         case BTN_STYLUS2:
 238         case BTN_MIDDLE:        index = 2; break;
 239
 240         case BTN_3:
 241         case BTN_BACK:
 242         case BTN_SIDE:          index = 3; break;
 243
 244         case BTN_4:
 245         case BTN_EXTRA:         index = 4; break;
 246
 247         default:                return;
 248         }
 249
 250         if (value) {
 251                 set_bit(index, &mousedev->packet.buttons);
 252                 set_bit(index, &mousedev_mix->packet.buttons);
 253         } else {
 254                 clear_bit(index, &mousedev->packet.buttons);
 255                 clear_bit(index, &mousedev_mix->packet.buttons);
 256         }
 257 }
 258
 259 static void mousedev_notify_readers(struct mousedev *mousedev,
 260                                     struct mousedev_hw_data *packet)
 261 {
 262         struct mousedev_client *client;
 263         struct mousedev_motion *p;
 264         unsigned int new_head;
 265         int wake_readers = 0;
 266
 267         rcu_read_lock();
 268         list_for_each_entry_rcu(client, &mousedev->client_list, node) {
 269
 270                 /* Just acquire the lock, interrupts already disabled */
 271                 spin_lock(&client->packet_lock);
 272
 273                 p = &client->packets[client->head];
 274                 if (client->ready && p->buttons != mousedev->packet.buttons) {
 275                         new_head = (client->head + 1) % PACKET_QUEUE_LEN;
 276                         if (new_head != client->tail) {
 277                                 p = &client->packets[client->head = new_head];
 278                                 memset(p, 0, sizeof(struct mousedev_motion));
 279                         }
 280                 }
 281
 282                 if (packet->abs_event) {
 283                         p->dx += packet->x - client->pos_x;
 284                         p->dy += packet->y - client->pos_y;
 285                         client->pos_x = packet->x;
 286                         client->pos_y = packet->y;
 287                 }
 288
 289                 client->pos_x += packet->dx;
 290                 client->pos_x = client->pos_x < 0 ?
 291                         0 : (client->pos_x >= xres ? xres : client->pos_x);
 292                 client->pos_y += packet->dy;
 293                 client->pos_y = client->pos_y < 0 ?
 294                         0 : (client->pos_y >= yres ? yres : client->pos_y);
 295
 296                 p->dx += packet->dx;
 297                 p->dy += packet->dy;
 298                 p->dz += packet->dz;
 299                 p->buttons = mousedev->packet.buttons;
 300
 301                 if (p->dx || p->dy || p->dz ||
 302                     p->buttons != client->last_buttons)
 303                         client->ready = 1;
 304
 305                 spin_unlock(&client->packet_lock);
 306
 307                 if (client->ready) {
 308                         kill_fasync(&client->fasync, SIGIO, POLL_IN);
 309                         wake_readers = 1;
 310                 }
 311         }
 312         rcu_read_unlock();
 313
 314         if (wake_readers)
 315                 wake_up_interruptible(&mousedev->wait);
 316 }
 317
 318 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
 319 {
 320         if (!value) {
 321                 if (mousedev->touch &&
 322                     time_before(jiffies,
 323                                 mousedev->touch + msecs_to_jiffies(tap_time))) {
 324                         /*
 325                          * Toggle left button to emulate tap.
 326                          * We rely on the fact that mousedev_mix always has 0
 327                          * motion packet so we won't mess current position.
 328                          */
 329                         set_bit(0, &mousedev->packet.buttons);
 330                         set_bit(0, &mousedev_mix->packet.buttons);
 331                         mousedev_notify_readers(mousedev, &mousedev_mix->packet);
 332                         mousedev_notify_readers(mousedev_mix,
 333                                                 &mousedev_mix->packet);
 334                         clear_bit(0, &mousedev->packet.buttons);
 335                         clear_bit(0, &mousedev_mix->packet.buttons);
 336                 }
 337                 mousedev->touch = mousedev->pkt_count = 0;
 338                 mousedev->frac_dx = 0;
 339                 mousedev->frac_dy = 0;
 340
 341         } else if (!mousedev->touch)
 342                 mousedev->touch = jiffies;
 343 }
 344
 345 static void mousedev_event(struct input_handle *handle,
 346                            unsigned int type, unsigned int code, int value)
 347 {
 348         struct mousedev *mousedev = handle->private;
 349
 350         switch (type) {
 351
 352         case EV_ABS:
 353                 /* Ignore joysticks */
 354                 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
 355                         return;
 356
 357                 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 358                         mousedev_touchpad_event(handle->dev,
 359                                                 mousedev, code, value);
 360                 else
 361                         mousedev_abs_event(handle->dev, mousedev, code, value);
 362
 363                 break;
 364
 365         case EV_REL:
 366                 mousedev_rel_event(mousedev, code, value);
 367                 break;
 368
 369         case EV_KEY:
 370                 if (value != 2) {
 371                         if (code == BTN_TOUCH &&
 372                             test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 373                                 mousedev_touchpad_touch(mousedev, value);
 374                         else
 375                                 mousedev_key_event(mousedev, code, value);
 376                 }
 377                 break;
 378
 379         case EV_SYN:
 380                 if (code == SYN_REPORT) {
 381                         if (mousedev->touch) {
 382                                 mousedev->pkt_count++;
 383                                 /*
 384                                  * Input system eats duplicate events,
 385                                  * but we need all of them to do correct
 386                                  * averaging so apply present one forward
 387                                  */
 388                                 fx(0) = fx(1);
 389                                 fy(0) = fy(1);
 390                         }
 391
 392                         mousedev_notify_readers(mousedev, &mousedev->packet);
 393                         mousedev_notify_readers(mousedev_mix, &mousedev->packet);
 394
 395                         mousedev->packet.dx = mousedev->packet.dy =
 396                                 mousedev->packet.dz = 0;
 397                         mousedev->packet.abs_event = 0;
 398                 }
 399                 break;
 400         }
 401 }
 402
 403 static int mousedev_fasync(int fd, struct file *file, int on)
 404 {
 405         struct mousedev_client *client = file->private_data;
 406
 407         return fasync_helper(fd, file, on, &client->fasync);
 408 }
 409
 410 static void mousedev_free(struct device *dev)
 411 {
 412         struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
 413
 414         input_put_device(mousedev->handle.dev);
 415         kfree(mousedev);
 416 }
 417
 418 static int mousedev_open_device(struct mousedev *mousedev)
 419 {
 420         int retval;
 421
 422         retval = mutex_lock_interruptible(&mousedev->mutex);
 423         if (retval)
 424                 return retval;
 425
 426         if (mousedev->minor == MOUSEDEV_MIX)
 427                 mixdev_open_devices();
 428         else if (!mousedev->exist)
 429                 retval = -ENODEV;
 430         else if (!mousedev->open++) {
 431                 retval = input_open_device(&mousedev->handle);
 432                 if (retval)
 433                         mousedev->open--;
 434         }
 435
 436         mutex_unlock(&mousedev->mutex);
 437         return retval;
 438 }
 439
 440 static void mousedev_close_device(struct mousedev *mousedev)
 441 {
 442         mutex_lock(&mousedev->mutex);
 443
 444         if (mousedev->minor == MOUSEDEV_MIX)
 445                 mixdev_close_devices();
 446         else if (mousedev->exist && !--mousedev->open)
 447                 input_close_device(&mousedev->handle);
 448
 449         mutex_unlock(&mousedev->mutex);
 450 }
 451
 452 /*
 453  * Open all available devices so they can all be multiplexed in one.
 454  * stream. Note that this function is called with mousedev_mix->mutex
 455  * held.
 456  */
 457 static void mixdev_open_devices(void)
 458 {
 459         struct mousedev *mousedev;
 460
 461         if (mousedev_mix->open++)
 462                 return;
 463
 464         list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
 465                 if (!mousedev->mixdev_open) {
 466                         if (mousedev_open_device(mousedev))
 467                                 continue;
 468
 469                         mousedev->mixdev_open = 1;
 470                 }
 471         }
 472 }
 473
 474 /*
 475  * Close all devices that were opened as part of multiplexed
 476  * device. Note that this function is called with mousedev_mix->mutex
 477  * held.
 478  */
 479 static void mixdev_close_devices(void)
 480 {
 481         struct mousedev *mousedev;
 482
 483         if (--mousedev_mix->open)
 484                 return;
 485
 486         list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
 487                 if (mousedev->mixdev_open) {
 488                         mousedev->mixdev_open = 0;
 489                         mousedev_close_device(mousedev);
 490                 }
 491         }
 492 }
 493
 494
 495 static void mousedev_attach_client(struct mousedev *mousedev,
 496                                    struct mousedev_client *client)
 497 {
 498         spin_lock(&mousedev->client_lock);
 499         list_add_tail_rcu(&client->node, &mousedev->client_list);
 500         spin_unlock(&mousedev->client_lock);
 501         synchronize_rcu();
 502 }
 503
 504 static void mousedev_detach_client(struct mousedev *mousedev,
 505                                    struct mousedev_client *client)
 506 {
 507         spin_lock(&mousedev->client_lock);
 508         list_del_rcu(&client->node);
 509         spin_unlock(&mousedev->client_lock);
 510         synchronize_rcu();
 511 }
 512
 513 static int mousedev_release(struct inode *inode, struct file *file)
 514 {
 515         struct mousedev_client *client = file->private_data;
 516         struct mousedev *mousedev = client->mousedev;
 517
 518         mousedev_detach_client(mousedev, client);
 519         kfree(client);
 520
 521         mousedev_close_device(mousedev);
 522         put_device(&mousedev->dev);
 523
 524         return 0;
 525 }
 526
 527 static int mousedev_open(struct inode *inode, struct file *file)
 528 {
 529         struct mousedev_client *client;
 530         struct mousedev *mousedev;
 531         int error;
 532         int i;
 533
 534 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 535         if (imajor(inode) == MISC_MAJOR)
 536                 i = MOUSEDEV_MIX;
 537         else
 538 #endif
 539                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
 540
 541         if (i >= MOUSEDEV_MINORS)
 542                 return -ENODEV;
 543
 544         error = mutex_lock_interruptible(&mousedev_table_mutex);
 545         if (error) {
 546                 return error;
 547         }
 548         mousedev = mousedev_table[i];
 549         if (mousedev)
 550                 get_device(&mousedev->dev);
 551         mutex_unlock(&mousedev_table_mutex);
 552
 553         if (!mousedev) {
 554                 return -ENODEV;
 555         }
 556
 557         client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
 558         if (!client) {
 559                 error = -ENOMEM;
 560                 goto err_put_mousedev;
 561         }
 562
 563         spin_lock_init(&client->packet_lock);
 564         client->pos_x = xres / 2;
 565         client->pos_y = yres / 2;
 566         client->mousedev = mousedev;
 567         mousedev_attach_client(mousedev, client);
 568
 569         error = mousedev_open_device(mousedev);
 570         if (error)
 571                 goto err_free_client;
 572
 573         file->private_data = client;
 574         return 0;
 575
 576  err_free_client:
 577         mousedev_detach_client(mousedev, client);
 578         kfree(client);
 579  err_put_mousedev:
 580         put_device(&mousedev->dev);
 581         return error;
 582 }
 583
 584 static inline int mousedev_limit_delta(int delta, int limit)
 585 {
 586         return delta > limit ? limit : (delta < -limit ? -limit : delta);
 587 }
 588
 589 static void mousedev_packet(struct mousedev_client *client,
 590                             signed char *ps2_data)
 591 {
 592         struct mousedev_motion *p = &client->packets[client->tail];
 593
 594         ps2_data[0] = 0x08 |
 595                 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
 596         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
 597         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
 598         p->dx -= ps2_data[1];
 599         p->dy -= ps2_data[2];
 600
 601         switch (client->mode) {
 602         case MOUSEDEV_EMUL_EXPS:
 603                 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
 604                 p->dz -= ps2_data[3];
 605                 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
 606                 client->bufsiz = 4;
 607                 break;
 608
 609         case MOUSEDEV_EMUL_IMPS:
 610                 ps2_data[0] |=
 611                         ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 612                 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
 613                 p->dz -= ps2_data[3];
 614                 client->bufsiz = 4;
 615                 break;
 616
 617         case MOUSEDEV_EMUL_PS2:
 618         default:
 619                 ps2_data[0] |=
 620                         ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 621                 p->dz = 0;
 622                 client->bufsiz = 3;
 623                 break;
 624         }
 625
 626         if (!p->dx && !p->dy && !p->dz) {
 627                 if (client->tail == client->head) {
 628                         client->ready = 0;
 629                         client->last_buttons = p->buttons;
 630                 } else
 631                         client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
 632         }
 633 }
 634
 635 static void mousedev_generate_response(struct mousedev_client *client,
 636                                         int command)
 637 {
 638         client->ps2[0] = 0xfa; /* ACK */
 639
 640         switch (command) {
 641
 642         case 0xeb: /* Poll */
 643                 mousedev_packet(client, &client->ps2[1]);
 644                 client->bufsiz++; /* account for leading ACK */
 645                 break;
 646
 647         case 0xf2: /* Get ID */
 648                 switch (client->mode) {
 649                 case MOUSEDEV_EMUL_PS2:
 650                         client->ps2[1] = 0;
 651                         break;
 652                 case MOUSEDEV_EMUL_IMPS:
 653                         client->ps2[1] = 3;
 654                         break;
 655                 case MOUSEDEV_EMUL_EXPS:
 656                         client->ps2[1] = 4;
 657                         break;
 658                 }
 659                 client->bufsiz = 2;
 660                 break;
 661
 662         case 0xe9: /* Get info */
 663                 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
 664                 client->bufsiz = 4;
 665                 break;
 666
 667         case 0xff: /* Reset */
 668                 client->impsseq = client->imexseq = 0;
 669                 client->mode = MOUSEDEV_EMUL_PS2;
 670                 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
 671                 client->bufsiz = 3;
 672                 break;
 673
 674         default:
 675                 client->bufsiz = 1;
 676                 break;
 677         }
 678         client->buffer = client->bufsiz;
 679 }
 680
 681 static ssize_t mousedev_write(struct file *file, const char __user *buffer,
 682                                 size_t count, loff_t *ppos)
 683 {
 684         struct mousedev_client *client = file->private_data;
 685         unsigned char c;
 686         unsigned int i;
 687
 688         for (i = 0; i < count; i++) {
 689
 690                 if (get_user(c, buffer + i))
 691                         return -EFAULT;
 692
 693                 spin_lock_irq(&client->packet_lock);
 694
 695                 if (c == mousedev_imex_seq[client->imexseq]) {
 696                         if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
 697                                 client->imexseq = 0;
 698                                 client->mode = MOUSEDEV_EMUL_EXPS;
 699                         }
 700                 } else
 701                         client->imexseq = 0;
 702
 703                 if (c == mousedev_imps_seq[client->impsseq]) {
 704                         if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
 705                                 client->impsseq = 0;
 706                                 client->mode = MOUSEDEV_EMUL_IMPS;
 707                         }
 708                 } else
 709                         client->impsseq = 0;
 710
 711                 mousedev_generate_response(client, c);
 712
 713                 spin_unlock_irq(&client->packet_lock);
 714         }
 715
 716         kill_fasync(&client->fasync, SIGIO, POLL_IN);
 717         wake_up_interruptible(&client->mousedev->wait);
 718
 719         return count;
 720 }
 721
 722 static ssize_t mousedev_read(struct file *file, char __user *buffer,
 723                              size_t count, loff_t *ppos)
 724 {
 725         struct mousedev_client *client = file->private_data;
 726         struct mousedev *mousedev = client->mousedev;
 727         signed char data[sizeof(client->ps2)];
 728         int retval = 0;
 729
 730         if (!client->ready && !client->buffer && mousedev->exist &&
 731             (file->f_flags & O_NONBLOCK))
 732                 return -EAGAIN;
 733
 734         retval = wait_event_interruptible(mousedev->wait,
 735                         !mousedev->exist || client->ready || client->buffer);
 736         if (retval)
 737                 return retval;
 738
 739         if (!mousedev->exist)
 740                 return -ENODEV;
 741
 742         spin_lock_irq(&client->packet_lock);
 743
 744         if (!client->buffer && client->ready) {
 745                 mousedev_packet(client, client->ps2);
 746                 client->buffer = client->bufsiz;
 747         }
 748
 749         if (count > client->buffer)
 750                 count = client->buffer;
 751
 752         memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
 753         client->buffer -= count;
 754
 755         spin_unlock_irq(&client->packet_lock);
 756
 757         if (copy_to_user(buffer, data, count))
 758                 return -EFAULT;
 759
 760         return count;
 761 }
 762
 763 /* No kernel lock - fine */
 764 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 765 {
 766         struct mousedev_client *client = file->private_data;
 767         struct mousedev *mousedev = client->mousedev;
 768
 769         poll_wait(file, &mousedev->wait, wait);
 770         return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
 771                 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
 772 }
 773
 774 static const struct file_operations mousedev_fops = {
 775         .owner =        THIS_MODULE,
 776         .read =         mousedev_read,
 777         .write =        mousedev_write,
 778         .poll =         mousedev_poll,
 779         .open =         mousedev_open,
 780         .release =      mousedev_release,
 781         .fasync =       mousedev_fasync,
 782 };
 783
 784 static int mousedev_install_chrdev(struct mousedev *mousedev)
 785 {
 786         mousedev_table[mousedev->minor] = mousedev;
 787         return 0;
 788 }
 789
 790 static void mousedev_remove_chrdev(struct mousedev *mousedev)
 791 {
 792         mutex_lock(&mousedev_table_mutex);
 793         mousedev_table[mousedev->minor] = NULL;
 794         mutex_unlock(&mousedev_table_mutex);
 795 }
 796
 797 /*
 798  * Mark device non-existent. This disables writes, ioctls and
 799  * prevents new users from opening the device. Already posted
 800  * blocking reads will stay, however new ones will fail.
 801  */
 802 static void mousedev_mark_dead(struct mousedev *mousedev)
 803 {
 804         mutex_lock(&mousedev->mutex);
 805         mousedev->exist = 0;
 806         mutex_unlock(&mousedev->mutex);
 807 }
 808
 809 /*
 810  * Wake up users waiting for IO so they can disconnect from
 811  * dead device.
 812  */
 813 static void mousedev_hangup(struct mousedev *mousedev)
 814 {
 815         struct mousedev_client *client;
 816
 817         spin_lock(&mousedev->client_lock);
 818         list_for_each_entry(client, &mousedev->client_list, node)
 819                 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 820         spin_unlock(&mousedev->client_lock);
 821
 822         wake_up_interruptible(&mousedev->wait);
 823 }
 824
 825 static void mousedev_cleanup(struct mousedev *mousedev)
 826 {
 827         struct input_handle *handle = &mousedev->handle;
 828
 829         mousedev_mark_dead(mousedev);
 830         mousedev_hangup(mousedev);
 831         mousedev_remove_chrdev(mousedev);
 832
 833         /* mousedev is marked dead so no one else accesses mousedev->open */
 834         if (mousedev->open)
 835                 input_close_device(handle);
 836 }
 837
 838 static struct mousedev *mousedev_create(struct input_dev *dev,
 839                                         struct input_handler *handler,
 840                                         int minor)
 841 {
 842         struct mousedev *mousedev;
 843         int error;
 844
 845         mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
 846         if (!mousedev) {
 847                 error = -ENOMEM;
 848                 goto err_out;
 849         }
 850
 851         INIT_LIST_HEAD(&mousedev->client_list);
 852         INIT_LIST_HEAD(&mousedev->mixdev_node);
 853         spin_lock_init(&mousedev->client_lock);
 854         mutex_init(&mousedev->mutex);
 855         lockdep_set_subclass(&mousedev->mutex,
 856                              minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);
 857         init_waitqueue_head(&mousedev->wait);
 858
 859         if (minor == MOUSEDEV_MIX)
 860                 dev_set_name(&mousedev->dev, "mice");
 861         else
 862                 dev_set_name(&mousedev->dev, "mouse%d", minor);
 863
 864         mousedev->minor = minor;
 865         mousedev->exist = 1;
 866         mousedev->handle.dev = input_get_device(dev);
 867         mousedev->handle.name = dev_name(&mousedev->dev);
 868         mousedev->handle.handler = handler;
 869         mousedev->handle.private = mousedev;
 870
 871         mousedev->dev.class = &input_class;
 872         if (dev)
 873                 mousedev->dev.parent = &dev->dev;
 874         mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
 875         mousedev->dev.release = mousedev_free;
 876         device_initialize(&mousedev->dev);
 877
 878         if (minor != MOUSEDEV_MIX) {
 879                 error = input_register_handle(&mousedev->handle);
 880                 if (error)
 881                         goto err_free_mousedev;
 882         }
 883
 884         error = mousedev_install_chrdev(mousedev);
 885         if (error)
 886                 goto err_unregister_handle;
 887
 888         error = device_add(&mousedev->dev);
 889         if (error)
 890                 goto err_cleanup_mousedev;
 891
 892         return mousedev;
 893
 894  err_cleanup_mousedev:
 895         mousedev_cleanup(mousedev);
 896  err_unregister_handle:
 897         if (minor != MOUSEDEV_MIX)
 898                 input_unregister_handle(&mousedev->handle);
 899  err_free_mousedev:
 900         put_device(&mousedev->dev);
 901  err_out:
 902         return ERR_PTR(error);
 903 }
 904
 905 static void mousedev_destroy(struct mousedev *mousedev)
 906 {
 907         device_del(&mousedev->dev);
 908         mousedev_cleanup(mousedev);
 909         if (mousedev->minor != MOUSEDEV_MIX)
 910                 input_unregister_handle(&mousedev->handle);
 911         put_device(&mousedev->dev);
 912 }
 913
 914 static int mixdev_add_device(struct mousedev *mousedev)
 915 {
 916         int retval;
 917
 918         retval = mutex_lock_interruptible(&mousedev_mix->mutex);
 919         if (retval)
 920                 return retval;
 921
 922         if (mousedev_mix->open) {
 923                 retval = mousedev_open_device(mousedev);
 924                 if (retval)
 925                         goto out;
 926
 927                 mousedev->mixdev_open = 1;
 928         }
 929
 930         get_device(&mousedev->dev);
 931         list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
 932
 933  out:
 934         mutex_unlock(&mousedev_mix->mutex);
 935         return retval;
 936 }
 937
 938 static void mixdev_remove_device(struct mousedev *mousedev)
 939 {
 940         mutex_lock(&mousedev_mix->mutex);
 941
 942         if (mousedev->mixdev_open) {
 943                 mousedev->mixdev_open = 0;
 944                 mousedev_close_device(mousedev);
 945         }
 946
 947         list_del_init(&mousedev->mixdev_node);
 948         mutex_unlock(&mousedev_mix->mutex);
 949
 950         put_device(&mousedev->dev);
 951 }
 952
 953 static int mousedev_connect(struct input_handler *handler,
 954                             struct input_dev *dev,
 955                             const struct input_device_id *id)
 956 {
 957         struct mousedev *mousedev;
 958         int minor;
 959         int error;
 960
 961         for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
 962                 if (!mousedev_table[minor])
 963                         break;
 964
 965         if (minor == MOUSEDEV_MINORS) {
 966                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 967                 return -ENFILE;
 968         }
 969
 970         mousedev = mousedev_create(dev, handler, minor);
 971         if (IS_ERR(mousedev))
 972                 return PTR_ERR(mousedev);
 973
 974         error = mixdev_add_device(mousedev);
 975         if (error) {
 976                 mousedev_destroy(mousedev);
 977                 return error;
 978         }
 979
 980         return 0;
 981 }
 982
 983 static void mousedev_disconnect(struct input_handle *handle)
 984 {
 985         struct mousedev *mousedev = handle->private;
 986
 987         mixdev_remove_device(mousedev);
 988         mousedev_destroy(mousedev);
 989 }
 990
 991 static const struct input_device_id mousedev_ids[] = {
 992         {
 993                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
 994                                 INPUT_DEVICE_ID_MATCH_KEYBIT |
 995                                 INPUT_DEVICE_ID_MATCH_RELBIT,
 996                 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
 997                 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
 998                 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
 999         },      /* A mouse like device, at least one button,
1000                    two relative axes */
1001         {
1002                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1003                                 INPUT_DEVICE_ID_MATCH_RELBIT,
1004                 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1005                 .relbit = { BIT_MASK(REL_WHEEL) },
1006         },      /* A separate scrollwheel */
1007         {
1008                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1009                                 INPUT_DEVICE_ID_MATCH_KEYBIT |
1010                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
1011                 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1012                 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1013                 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1014         },      /* A tablet like device, at least touch detection,
1015                    two absolute axes */
1016         {
1017                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1018                                 INPUT_DEVICE_ID_MATCH_KEYBIT |
1019                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
1020                 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1021                 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
1022                                 BIT_MASK(BTN_TOOL_FINGER) },
1023                 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1024                                 BIT_MASK(ABS_PRESSURE) |
1025                                 BIT_MASK(ABS_TOOL_WIDTH) },
1026         },      /* A touchpad */
1027         {
1028                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1029                         INPUT_DEVICE_ID_MATCH_KEYBIT |
1030                         INPUT_DEVICE_ID_MATCH_ABSBIT,
1031                 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1032                 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1033                 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1034         },      /* Mouse-like device with absolute X and Y but ordinary
1035                    clicks, like hp ILO2 High Performance mouse */
1036
1037         { },    /* Terminating entry */
1038 };
1039
1040 MODULE_DEVICE_TABLE(input, mousedev_ids);
1041
1042 static struct input_handler mousedev_handler = {
1043         .event =        mousedev_event,
1044         .connect =      mousedev_connect,
1045         .disconnect =   mousedev_disconnect,
1046         .fops =         &mousedev_fops,
1047         .minor =        MOUSEDEV_MINOR_BASE,
1048         .name =         "mousedev",
1049         .id_table =     mousedev_ids,
1050 };
1051
1052 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1053 static struct miscdevice psaux_mouse = {
1054         PSMOUSE_MINOR, "psaux", &mousedev_fops
1055 };
1056 static int psaux_registered;
1057 #endif
1058
1059 static int __init mousedev_init(void)
1060 {
1061         int error;
1062
1063         mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1064         if (IS_ERR(mousedev_mix))
1065                 return PTR_ERR(mousedev_mix);
1066
1067         error = input_register_handler(&mousedev_handler);
1068         if (error) {
1069                 mousedev_destroy(mousedev_mix);
1070                 return error;
1071         }
1072
1073 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1074         error = misc_register(&psaux_mouse);
1075         if (error)
1076                 printk(KERN_WARNING "mice: could not register psaux device, "
1077                         "error: %d\n", error);
1078         else
1079                 psaux_registered = 1;
1080 #endif
1081
1082         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
1083
1084         return 0;
1085 }
1086
1087 static void __exit mousedev_exit(void)
1088 {
1089 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1090         if (psaux_registered)
1091                 misc_deregister(&psaux_mouse);
1092 #endif
1093         input_unregister_handler(&mousedev_handler);
1094         mousedev_destroy(mousedev_mix);
1095 }
1096
1097 module_init(mousedev_init);
1098 module_exit(mousedev_exit);