drivers/input/mousedev.c

   1 /*
   2  * $Id: mousedev.c,v 1.24 2000/11/15 10:57:45 vojtech Exp $
   3  *
   4  *  Copyright (c) 1999-2000 Vojtech Pavlik
   5  *
   6  *  Input driver to ImExPS/2 device driver module.
   7  *
   8  *  Sponsored by SuSE
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  * Should you need to contact me, the author, you can do so either by
  27  * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
  28  * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
  29  */
  30
  31 #define MOUSEDEV_MINOR_BASE     32
  32 #define MOUSEDEV_MINORS         32
  33 #define MOUSEDEV_MIX            31
  34
  35 #include <linux/slab.h>
  36 #include <linux/poll.h>
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/input.h>
  40 #include <linux/config.h>
  41 #include <linux/smp_lock.h>
  42 #include <linux/random.h>
  43
  44 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
  45 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X  1024
  46 #endif
  47 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
  48 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y  768
  49 #endif
  50
  51 struct mousedev {
  52         int exist;
  53         int open;
  54         int minor;
  55         wait_queue_head_t wait;
  56         struct mousedev_list *list;
  57         struct input_handle handle;
  58         devfs_handle_t devfs;
  59 };
  60
  61 struct mousedev_list {
  62         struct fasync_struct *fasync;
  63         struct mousedev *mousedev;
  64         struct mousedev_list *next;
  65         int dx, dy, dz, oldx, oldy;
  66         signed char ps2[6];
  67         unsigned long buttons;
  68         unsigned char ready, buffer, bufsiz;
  69         unsigned char mode, imexseq, impsseq;
  70 };
  71
  72 #define MOUSEDEV_SEQ_LEN        6
  73
  74 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
  75 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
  76
  77 static struct input_handler mousedev_handler;
  78
  79 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
  80 static struct mousedev mousedev_mix;
  81
  82 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
  83 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
  84
  85 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  86 {
  87         struct mousedev *mousedevs[3] = { handle->private, &mousedev_mix, NULL };
  88         struct mousedev **mousedev = mousedevs;
  89         struct mousedev_list *list;
  90         int index, size;
  91
  92         add_mouse_randomness((type << 4) ^ code ^ (code >> 4) ^ value);
  93
  94         while (*mousedev) {
  95                 list = (*mousedev)->list;
  96                 while (list) {
  97                         switch (type) {
  98                                 case EV_ABS:
  99                                         if (test_bit(BTN_TRIGGER, handle->dev->keybit))
 100                                                 break;
 101                                         switch (code) {
 102                                                 case ABS_X:
 103                                                         size = handle->dev->absmax[ABS_X] - handle->dev->absmin[ABS_X];
 104                                                         list->dx += (value * xres - list->oldx) / size;
 105                                                         list->oldx += list->dx * size;
 106                                                         break;
 107                                                 case ABS_Y:
 108                                                         size = handle->dev->absmax[ABS_Y] - handle->dev->absmin[ABS_Y];
 109                                                         list->dy -= (value * yres - list->oldy) / size;
 110                                                         list->oldy -= list->dy * size;
 111                                                         break;
 112                                         }
 113                                         break;
 114
 115                                 case EV_REL:
 116                                         switch (code) {
 117                                                 case REL_X:     list->dx += value; break;
 118                                                 case REL_Y:     list->dy -= value; break;
 119                                                 case REL_WHEEL: if (list->mode) list->dz -= value; break;
 120                                         }
 121                                         break;
 122
 123                                 case EV_KEY:
 124                                         switch (code) {
 125                                                 case BTN_0:
 126                                                 case BTN_TOUCH:
 127                                                 case BTN_LEFT:   index = 0; break;
 128                                                 case BTN_4:
 129                                                 case BTN_EXTRA:  if (list->mode == 2) { index = 4; break; }
 130                                                 case BTN_STYLUS:
 131                                                 case BTN_1:
 132                                                 case BTN_RIGHT:  index = 1; break;
 133                                                 case BTN_3:
 134                                                 case BTN_SIDE:   if (list->mode == 2) { index = 3; break; }
 135                                                 case BTN_2:
 136                                                 case BTN_STYLUS2:
 137                                                 case BTN_MIDDLE: index = 2; break;
 138                                                 default: return;
 139                                         }
 140                                         switch (value) {
 141                                                 case 0: clear_bit(index, &list->buttons); break;
 142                                                 case 1: set_bit(index, &list->buttons); break;
 143                                                 case 2: return;
 144                                         }
 145                                         break;
 146                         }
 147
 148                         list->ready = 1;
 149
 150                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 151
 152                         list = list->next;
 153                 }
 154
 155                 wake_up_interruptible(&((*mousedev)->wait));
 156                 mousedev++;
 157         }
 158 }
 159
 160 static int mousedev_fasync(int fd, struct file *file, int on)
 161 {
 162         int retval;
 163         struct mousedev_list *list = file->private_data;
 164         retval = fasync_helper(fd, file, on, &list->fasync);
 165         return retval < 0 ? retval : 0;
 166 }
 167
 168 static int mousedev_release(struct inode * inode, struct file * file)
 169 {
 170         struct mousedev_list *list = file->private_data;
 171         struct mousedev_list **listptr;
 172
 173         lock_kernel();
 174         listptr = &list->mousedev->list;
 175         mousedev_fasync(-1, file, 0);
 176
 177         while (*listptr && (*listptr != list))
 178                 listptr = &((*listptr)->next);
 179         *listptr = (*listptr)->next;
 180
 181         if (!--list->mousedev->open) {
 182                 if (list->mousedev->minor == MOUSEDEV_MIX) {
 183                         struct input_handle *handle = mousedev_handler.handle;
 184                         while (handle) {
 185                                 struct mousedev *mousedev = handle->private;
 186                                 if (!mousedev->open) {
 187                                         if (mousedev->exist) {
 188                                                 input_close_device(&mousedev->handle);
 189                                         } else {
 190                                                 input_unregister_minor(mousedev->devfs);
 191                                                 mousedev_table[mousedev->minor] = NULL;
 192                                                 kfree(mousedev);
 193                                         }
 194                                 }
 195                                 handle = handle->hnext;
 196                         }
 197                 } else {
 198                         if (!mousedev_mix.open) {
 199                                 if (list->mousedev->exist) {
 200                                         input_close_device(&list->mousedev->handle);
 201                                 } else {
 202                                         input_unregister_minor(list->mousedev->devfs);
 203                                         mousedev_table[list->mousedev->minor] = NULL;
 204                                         kfree(list->mousedev);
 205                                 }
 206                         }
 207                 }
 208         }
 209
 210         kfree(list);
 211         unlock_kernel();
 212
 213         return 0;
 214 }
 215
 216 static int mousedev_open(struct inode * inode, struct file * file)
 217 {
 218         struct mousedev_list *list;
 219         int i = MINOR(inode->i_rdev) - MOUSEDEV_MINOR_BASE;
 220
 221         if (i >= MOUSEDEV_MINORS || !mousedev_table[i])
 222                 return -ENODEV;
 223
 224         if (!(list = kmalloc(sizeof(struct mousedev_list), GFP_KERNEL)))
 225                 return -ENOMEM;
 226         memset(list, 0, sizeof(struct mousedev_list));
 227
 228         list->mousedev = mousedev_table[i];
 229         list->next = mousedev_table[i]->list;
 230         mousedev_table[i]->list = list;
 231         file->private_data = list;
 232
 233         if (!list->mousedev->open++) {
 234                 if (list->mousedev->minor == MOUSEDEV_MIX) {
 235                         struct input_handle *handle = mousedev_handler.handle;
 236                         while (handle) {
 237                                 struct mousedev *mousedev = handle->private;
 238                                 if (!mousedev->open)
 239                                         if (mousedev->exist)
 240                                                 input_open_device(handle);
 241                                 handle = handle->hnext;
 242                         }
 243                 } else {
 244                         if (!mousedev_mix.open)
 245                                 if (list->mousedev->exist)
 246                                         input_open_device(&list->mousedev->handle);
 247                 }
 248         }
 249
 250         return 0;
 251 }
 252
 253 static void mousedev_packet(struct mousedev_list *list, unsigned char off)
 254 {
 255         list->ps2[off] = 0x08 | ((list->dx < 0) << 4) | ((list->dy < 0) << 5) | (list->buttons & 0x07);
 256         list->ps2[off + 1] = (list->dx > 127 ? 127 : (list->dx < -127 ? -127 : list->dx));
 257         list->ps2[off + 2] = (list->dy > 127 ? 127 : (list->dy < -127 ? -127 : list->dy));
 258         list->dx -= list->ps2[off + 1];
 259         list->dy -= list->ps2[off + 2];
 260         list->bufsiz = off + 3;
 261
 262         if (list->mode == 2) {
 263                 list->ps2[off + 3] = (list->dz > 7 ? 7 : (list->dz < -7 ? -7 : list->dz));
 264                 list->dz -= list->ps2[off + 3];
 265                 list->ps2[off + 3] = (list->ps2[off + 3] & 0x0f) | ((list->buttons & 0x18) << 1);
 266                 list->bufsiz++;
 267         }
 268
 269         if (list->mode == 1) {
 270                 list->ps2[off + 3] = (list->dz > 127 ? 127 : (list->dz < -127 ? -127 : list->dz));
 271                 list->dz -= list->ps2[off + 3];
 272                 list->bufsiz++;
 273         }
 274
 275         if (!list->dx && !list->dy && (!list->mode || !list->dz)) list->ready = 0;
 276         list->buffer = list->bufsiz;
 277 }
 278
 279
 280 static ssize_t mousedev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
 281 {
 282         struct mousedev_list *list = file->private_data;
 283         unsigned char c;
 284         int i;
 285
 286         for (i = 0; i < count; i++) {
 287
 288                 if (get_user(c, buffer + i))
 289                         return -EFAULT;
 290
 291                 if (c == mousedev_imex_seq[list->imexseq]) {
 292                         if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
 293                                 list->imexseq = 0;
 294                                 list->mode = 2;
 295                         }
 296                 } else list->imexseq = 0;
 297
 298                 if (c == mousedev_imps_seq[list->impsseq]) {
 299                         if (++list->impsseq == MOUSEDEV_SEQ_LEN) {
 300                                 list->impsseq = 0;
 301                                 list->mode = 1;
 302                         }
 303                 } else list->impsseq = 0;
 304
 305                 list->ps2[0] = 0xfa;
 306                 list->bufsiz = 1;
 307                 list->ready = 1;
 308
 309                 switch (c) {
 310
 311                         case 0xeb: /* Poll */
 312                                 mousedev_packet(list, 1);
 313                                 break;
 314
 315                         case 0xf2: /* Get ID */
 316                                 switch (list->mode) {
 317                                         case 0: list->ps2[1] = 0; break;
 318                                         case 1: list->ps2[1] = 3; break;
 319                                         case 2: list->ps2[1] = 4; break;
 320                                 }
 321                                 list->bufsiz = 2;
 322                                 break;
 323
 324                         case 0xe9: /* Get info */
 325                                 list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
 326                                 list->bufsiz = 4;
 327                                 break;
 328                 }
 329
 330                 list->buffer = list->bufsiz;
 331         }
 332
 333         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 334
 335         wake_up_interruptible(&list->mousedev->wait);
 336
 337         return count;
 338 }
 339
 340 static ssize_t mousedev_read(struct file * file, char * buffer, size_t count, loff_t *ppos)
 341 {
 342         DECLARE_WAITQUEUE(wait, current);
 343         struct mousedev_list *list = file->private_data;
 344         int retval = 0;
 345
 346         if (!list->ready && !list->buffer) {
 347
 348                 add_wait_queue(&list->mousedev->wait, &wait);
 349                 current->state = TASK_INTERRUPTIBLE;
 350
 351                 while (!list->ready) {
 352
 353                         if (file->f_flags & O_NONBLOCK) {
 354                                 retval = -EAGAIN;
 355                                 break;
 356                         }
 357                         if (signal_pending(current)) {
 358                                 retval = -ERESTARTSYS;
 359                                 break;
 360                         }
 361
 362                         schedule();
 363                 }
 364
 365                 current->state = TASK_RUNNING;
 366                 remove_wait_queue(&list->mousedev->wait, &wait);
 367         }
 368
 369         if (retval)
 370                 return retval;
 371
 372         if (!list->buffer)
 373                 mousedev_packet(list, 0);
 374
 375         if (count > list->buffer)
 376                 count = list->buffer;
 377
 378         if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer, count))
 379                 return -EFAULT;
 380
 381         list->buffer -= count;
 382
 383         return count;
 384 }
 385
 386 /* No kernel lock - fine */
 387 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 388 {
 389         struct mousedev_list *list = file->private_data;
 390         poll_wait(file, &list->mousedev->wait, wait);
 391         if (list->ready || list->buffer)
 392                 return POLLIN | POLLRDNORM;
 393         return 0;
 394 }
 395
 396 struct file_operations mousedev_fops = {
 397         owner:          THIS_MODULE,
 398         read:           mousedev_read,
 399         write:          mousedev_write,
 400         poll:           mousedev_poll,
 401         open:           mousedev_open,
 402         release:        mousedev_release,
 403         fasync:         mousedev_fasync,
 404 };
 405
 406 static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev)
 407 {
 408         struct mousedev *mousedev;
 409         int minor = 0;
 410
 411         if (!test_bit(EV_KEY, dev->evbit) ||
 412             (!test_bit(BTN_LEFT, dev->keybit) &&
 413              !test_bit(BTN_MIDDLE, dev->keybit) &&
 414              !test_bit(BTN_TOUCH, dev->keybit)))
 415                 return NULL;
 416
 417         if ((!test_bit(EV_REL, dev->evbit) || !test_bit(REL_X, dev->relbit)) &&
 418             (!test_bit(EV_REL, dev->evbit) || !test_bit(REL_WHEEL, dev->relbit)) &&
 419             (!test_bit(EV_ABS, dev->evbit) || !test_bit(ABS_X, dev->absbit)))
 420                 return NULL;
 421
 422         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 423         if (minor == MOUSEDEV_MINORS) {
 424                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 425                 return NULL;
 426         }
 427
 428         if (!(mousedev = kmalloc(sizeof(struct mousedev), GFP_KERNEL)))
 429                 return NULL;
 430         memset(mousedev, 0, sizeof(struct mousedev));
 431         init_waitqueue_head(&mousedev->wait);
 432
 433         mousedev->exist = 1;
 434         mousedev->minor = minor;
 435         mousedev_table[minor] = mousedev;
 436
 437         mousedev->handle.dev = dev;
 438         mousedev->handle.handler = handler;
 439         mousedev->handle.private = mousedev;
 440
 441         mousedev->devfs = input_register_minor("mouse%d", minor, MOUSEDEV_MINOR_BASE);
 442
 443         if (mousedev_mix.open)
 444                 input_open_device(&mousedev->handle);
 445
 446 //      printk(KERN_INFO "mouse%d: PS/2 mouse device for input%d\n", minor, dev->number);
 447
 448         return &mousedev->handle;
 449 }
 450
 451 static void mousedev_disconnect(struct input_handle *handle)
 452 {
 453         struct mousedev *mousedev = handle->private;
 454
 455         mousedev->exist = 0;
 456
 457         if (mousedev->open) {
 458                 input_close_device(handle);
 459         } else {
 460                 if (mousedev_mix.open)
 461                         input_close_device(handle);
 462                 input_unregister_minor(mousedev->devfs);
 463                 mousedev_table[mousedev->minor] = NULL;
 464                 kfree(mousedev);
 465         }
 466 }
 467
 468 static struct input_handler mousedev_handler = {
 469         event:          mousedev_event,
 470         connect:        mousedev_connect,
 471         disconnect:     mousedev_disconnect,
 472         fops:           &mousedev_fops,
 473         minor:          MOUSEDEV_MINOR_BASE,
 474 };
 475
 476 static int __init mousedev_init(void)
 477 {
 478         input_register_handler(&mousedev_handler);
 479
 480         memset(&mousedev_mix, 0, sizeof(struct mousedev));
 481         init_waitqueue_head(&mousedev_mix.wait);
 482         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 483         mousedev_mix.exist = 1;
 484         mousedev_mix.minor = MOUSEDEV_MIX;
 485         mousedev_mix.devfs = input_register_minor("mice", MOUSEDEV_MIX, MOUSEDEV_MINOR_BASE);
 486
 487         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 488
 489         return 0;
 490 }
 491
 492 static void __exit mousedev_exit(void)
 493 {
 494         input_unregister_minor(mousedev_mix.devfs);
 495         input_unregister_handler(&mousedev_handler);
 496 }
 497
 498 module_init(mousedev_init);
 499 module_exit(mousedev_exit);
 500
 501 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
 502 MODULE_DESCRIPTION("Input driver to PS/2 or ImPS/2 device driver");
 503 MODULE_LICENSE("GPL");
 504
 505 MODULE_PARM(xres, "i");
 506 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
 507 MODULE_PARM(yres, "i");
 508 MODULE_PARM_DESC(yres, "Vertical screen resolution");