drivers/usb/mousedev.c

   1 /*
   2  * $Id: mousedev.c,v 1.10 2000/06/23 09:23:00 vojtech Exp $
   3  *
   4  *  Copyright (c) 1999-2000 Vojtech Pavlik
   5  *
   6  *  Input driver to PS/2 or ImPS/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/malloc.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
  42 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
  43 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X  1024
  44 #endif
  45 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
  46 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y  768
  47 #endif
  48
  49 struct mousedev {
  50         int exist;
  51         int open;
  52         int minor;
  53         wait_queue_head_t wait;
  54         struct mousedev_list *list;
  55         struct input_handle handle;
  56         devfs_handle_t devfs;
  57 };
  58
  59 struct mousedev_list {
  60         struct fasync_struct *fasync;
  61         struct mousedev *mousedev;
  62         struct mousedev_list *next;
  63         int dx, dy, dz, oldx, oldy;
  64         char ps2[6];
  65         unsigned long buttons;
  66         unsigned char ready, buffer, bufsiz;
  67         unsigned char mode, genseq, impseq;
  68 };
  69
  70 #define MOUSEDEV_GENIUS_LEN     5
  71 #define MOUSEDEV_IMPS_LEN       6
  72
  73 static unsigned char mousedev_genius_seq[] = { 0xe8, 3, 0xe6, 0xe6, 0xe6 };
  74 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
  75
  76 static struct input_handler mousedev_handler;
  77
  78 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
  79 static struct mousedev mousedev_mix;
  80
  81 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  82 {
  83         struct mousedev *mousedevs[3] = { handle->private, &mousedev_mix, NULL };
  84         struct mousedev **mousedev = mousedevs;
  85         struct mousedev_list *list;
  86         int index, size;
  87
  88         while (*mousedev) {
  89                 list = (*mousedev)->list;
  90                 while (list) {
  91                         switch (type) {
  92                                 case EV_ABS:
  93                                         switch (code) {
  94                                                 case ABS_X:
  95                                                         size = handle->dev->absmax[ABS_X] - handle->dev->absmin[ABS_X];
  96                                                         list->dx += (value * CONFIG_INPUT_MOUSEDEV_SCREEN_X - list->oldx) / size;
  97                                                         list->oldx += list->dx * size;
  98                                                         break;
  99                                                 case ABS_Y:
 100                                                         size = handle->dev->absmax[ABS_Y] - handle->dev->absmin[ABS_Y];
 101                                                         list->dy -= (value * CONFIG_INPUT_MOUSEDEV_SCREEN_Y - list->oldy) / size;
 102                                                         list->oldy -= list->dy * size;
 103                                                         break;
 104                                         }
 105                                         break;
 106                                 case EV_REL:
 107                                         switch (code) {
 108                                                 case REL_X:     list->dx += value; break;
 109                                                 case REL_Y:     list->dy -= value; break;
 110                                                 case REL_WHEEL: if (list->mode) list->dz -= value; break;
 111                                         }
 112                                         break;
 113
 114                                 case EV_KEY:
 115                                         switch (code) {
 116                                                 case BTN_0:
 117                                                 case BTN_TOUCH:
 118                                                 case BTN_LEFT:   index = 0; break;
 119                                                 case BTN_4:
 120                                                 case BTN_EXTRA:  if (list->mode > 1) { index = 4; break; }
 121                                                 case BTN_STYLUS:
 122                                                 case BTN_1:
 123                                                 case BTN_RIGHT:  index = 1; break;
 124                                                 case BTN_3:
 125                                                 case BTN_SIDE:   if (list->mode > 1) { index = 3; break; }
 126                                                 case BTN_2:
 127                                                 case BTN_STYLUS2:
 128                                                 case BTN_MIDDLE: index = 2; break;
 129                                                 default: return;
 130                                         }
 131                                         switch (value) {
 132                                                 case 0: clear_bit(index, &list->buttons); break;
 133                                                 case 1: set_bit(index, &list->buttons); break;
 134                                                 case 2: return;
 135                                         }
 136                                         break;
 137                         }
 138
 139                         list->ready = 1;
 140
 141                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 142
 143                         list = list->next;
 144                 }
 145
 146                 wake_up_interruptible(&((*mousedev)->wait));
 147                 mousedev++;
 148         }
 149 }
 150
 151 static int mousedev_fasync(int fd, struct file *file, int on)
 152 {
 153         int retval;
 154         struct mousedev_list *list = file->private_data;
 155         retval = fasync_helper(fd, file, on, &list->fasync);
 156         return retval < 0 ? retval : 0;
 157 }
 158
 159 static int mousedev_release(struct inode * inode, struct file * file)
 160 {
 161         struct mousedev_list *list = file->private_data;
 162         struct mousedev_list **listptr = &list->mousedev->list;
 163
 164         mousedev_fasync(-1, file, 0);
 165
 166         while (*listptr && (*listptr != list))
 167                 listptr = &((*listptr)->next);
 168         *listptr = (*listptr)->next;
 169
 170         if (!--list->mousedev->open) {
 171                 if (list->mousedev->minor == MOUSEDEV_MIX) {
 172                         struct input_handle *handle = mousedev_handler.handle;
 173                         while (handle) {
 174                                 struct mousedev *mousedev = handle->private;
 175                                 if (!mousedev->open) {
 176                                         if (mousedev->exist) {
 177                                                 input_close_device(&mousedev->handle);
 178                                         } else {
 179                                                 input_unregister_minor(mousedev->devfs);
 180                                                 mousedev_table[mousedev->minor] = NULL;
 181                                                 kfree(mousedev);
 182                                         }
 183                                 }
 184                                 handle = handle->hnext;
 185                         }
 186                 } else {
 187                         if (!mousedev_mix.open) {
 188                                 if (list->mousedev->exist) {
 189                                         input_close_device(&list->mousedev->handle);
 190                                 } else {
 191                                         input_unregister_minor(list->mousedev->devfs);
 192                                         mousedev_table[list->mousedev->minor] = NULL;
 193                                         kfree(list->mousedev);
 194                                 }
 195                         }
 196                 }
 197         }
 198
 199         kfree(list);
 200
 201         return 0;
 202 }
 203
 204 static int mousedev_open(struct inode * inode, struct file * file)
 205 {
 206         struct mousedev_list *list;
 207         int i = MINOR(inode->i_rdev) - MOUSEDEV_MINOR_BASE;
 208
 209         if (i > MOUSEDEV_MINORS || !mousedev_table[i])
 210                 return -ENODEV;
 211
 212         if (!(list = kmalloc(sizeof(struct mousedev_list), GFP_KERNEL)))
 213                 return -ENOMEM;
 214         memset(list, 0, sizeof(struct mousedev_list));
 215
 216         list->mousedev = mousedev_table[i];
 217         list->next = mousedev_table[i]->list;
 218         mousedev_table[i]->list = list;
 219         file->private_data = list;
 220
 221         if (!list->mousedev->open++) {
 222                 if (list->mousedev->minor == MOUSEDEV_MIX) {
 223                         struct input_handle *handle = mousedev_handler.handle;
 224                         while (handle) {
 225                                 struct mousedev *mousedev = handle->private;
 226                                 if (!mousedev->open)
 227                                         if (mousedev->exist)
 228                                                 input_open_device(handle);
 229                                 handle = handle->hnext;
 230                         }
 231                 } else {
 232                         if (!mousedev_mix.open)
 233                                 if (list->mousedev->exist)
 234                                         input_open_device(&list->mousedev->handle);
 235                 }
 236         }
 237
 238         return 0;
 239 }
 240
 241 static void mousedev_packet(struct mousedev_list *list, unsigned char off)
 242 {
 243         list->ps2[off] = 0x08 | ((list->dx < 0) << 4) | ((list->dy < 0) << 5) | (list->buttons & 0x07);
 244         list->ps2[off + 1] = (list->dx > 127 ? 127 : (list->dx < -127 ? -127 : list->dx));
 245         list->ps2[off + 2] = (list->dy > 127 ? 127 : (list->dy < -127 ? -127 : list->dy));
 246         list->dx -= list->ps2[off + 1];
 247         list->dy -= list->ps2[off + 2];
 248         list->bufsiz = off + 3;
 249
 250         if (list->mode > 1)
 251                 list->ps2[off] |= ((list->buttons & 0x30) << 2);
 252
 253         if (list->mode) {
 254                 list->ps2[off + 3] = (list->dz > 127 ? 127 : (list->dz < -127 ? -127 : list->dz));
 255                 list->bufsiz++;
 256                 list->dz -= list->ps2[off + 3];
 257         }
 258         if (!list->dx && !list->dy && (!list->mode || !list->dz)) list->ready = 0;
 259         list->buffer = list->bufsiz;
 260 }
 261
 262
 263 static ssize_t mousedev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
 264 {
 265         struct mousedev_list *list = file->private_data;
 266         unsigned char c;
 267         int i;
 268
 269         for (i = 0; i < count; i++) {
 270
 271                 c = buffer[i];
 272
 273                 if (c == mousedev_genius_seq[list->genseq]) {
 274                         if (++list->genseq == MOUSEDEV_GENIUS_LEN) {
 275                                 list->genseq = 0;
 276                                 list->ready = 1;
 277                                 list->mode = 2;
 278                         }
 279                 } else list->genseq = 0;
 280
 281                 if (c == mousedev_imps_seq[list->impseq]) {
 282                         if (++list->impseq == MOUSEDEV_IMPS_LEN) {
 283                                 list->impseq = 0;
 284                                 list->ready = 1;
 285                                 list->mode = 1;
 286                         }
 287                 } else list->impseq = 0;
 288
 289                 list->ps2[0] = 0xfa;
 290                 list->bufsiz = 1;
 291
 292                 switch (c) {
 293
 294                         case 0xeb: /* Poll */
 295                                 mousedev_packet(list, 1);
 296                                 break;
 297
 298                         case 0xf2: /* Get ID */
 299                                 list->ps2[1] = (list->mode == 1) ? 3 : 0;
 300                                 list->bufsiz = 2;
 301                                 break;
 302
 303                         case 0xe9: /* Get info */
 304                                 if (list->mode == 2) {
 305                                         list->ps2[1] = 0x00; list->ps2[2] = 0x33; list->ps2[3] = 0x55;
 306                                 } else {
 307                                         list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
 308                                 }
 309                                 list->bufsiz = 4;
 310                                 break;
 311                 }
 312
 313                 list->buffer = list->bufsiz;
 314         }
 315
 316         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 317
 318         wake_up_interruptible(&list->mousedev->wait);
 319
 320         return count;
 321 }
 322
 323 static ssize_t mousedev_read(struct file * file, char * buffer, size_t count, loff_t *ppos)
 324 {
 325         DECLARE_WAITQUEUE(wait, current);
 326         struct mousedev_list *list = file->private_data;
 327         int retval = 0;
 328
 329         if (!list->ready && !list->buffer) {
 330
 331                 add_wait_queue(&list->mousedev->wait, &wait);
 332                 current->state = TASK_INTERRUPTIBLE;
 333
 334                 while (!list->ready) {
 335
 336                         if (file->f_flags & O_NONBLOCK) {
 337                                 retval = -EAGAIN;
 338                                 break;
 339                         }
 340                         if (signal_pending(current)) {
 341                                 retval = -ERESTARTSYS;
 342                                 break;
 343                         }
 344
 345                         schedule();
 346                 }
 347
 348                 current->state = TASK_RUNNING;
 349                 remove_wait_queue(&list->mousedev->wait, &wait);
 350         }
 351
 352         if (retval)
 353                 return retval;
 354
 355         if (!list->buffer)
 356                 mousedev_packet(list, 0);
 357
 358         if (count > list->buffer)
 359                 count = list->buffer;
 360
 361         if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer, count))
 362                 return -EFAULT;
 363
 364         list->buffer -= count;
 365
 366         return count;
 367 }
 368
 369 /* No kernel lock - fine */
 370 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 371 {
 372         struct mousedev_list *list = file->private_data;
 373         poll_wait(file, &list->mousedev->wait, wait);
 374         if (list->ready || list->buffer)
 375                 return POLLIN | POLLRDNORM;
 376         return 0;
 377 }
 378
 379 struct file_operations mousedev_fops = {
 380         owner:          THIS_MODULE,
 381         read:           mousedev_read,
 382         write:          mousedev_write,
 383         poll:           mousedev_poll,
 384         open:           mousedev_open,
 385         release:        mousedev_release,
 386         fasync:         mousedev_fasync,
 387 };
 388
 389 static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev)
 390 {
 391         struct mousedev *mousedev;
 392         int minor = 0;
 393
 394         if (!test_bit(EV_KEY, dev->evbit) ||
 395            (!test_bit(BTN_LEFT, dev->keybit) && !test_bit(BTN_TOUCH, dev->keybit)))
 396                 return NULL;
 397
 398         if ((!test_bit(EV_REL, dev->evbit) || !test_bit(REL_X, dev->relbit)) &&
 399             (!test_bit(EV_ABS, dev->evbit) || !test_bit(ABS_X, dev->absbit)))
 400                 return NULL;
 401
 402         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 403         if (mousedev_table[minor]) {
 404                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 405                 return NULL;
 406         }
 407
 408         if (!(mousedev = kmalloc(sizeof(struct mousedev), GFP_KERNEL)))
 409                 return NULL;
 410         memset(mousedev, 0, sizeof(struct mousedev));
 411         init_waitqueue_head(&mousedev->wait);
 412
 413         mousedev->exist = 1;
 414         mousedev->minor = minor;
 415         mousedev_table[minor] = mousedev;
 416
 417         mousedev->handle.dev = dev;
 418         mousedev->handle.handler = handler;
 419         mousedev->handle.private = mousedev;
 420
 421         mousedev->devfs = input_register_minor("mouse%d", minor, MOUSEDEV_MINOR_BASE);
 422
 423         if (mousedev_mix.open)
 424                 input_open_device(&mousedev->handle);
 425
 426         printk(KERN_INFO "mouse%d: PS/2 mouse device for input%d\n", minor, dev->number);
 427
 428         return &mousedev->handle;
 429 }
 430
 431 static void mousedev_disconnect(struct input_handle *handle)
 432 {
 433         struct mousedev *mousedev = handle->private;
 434
 435         mousedev->exist = 0;
 436
 437         if (mousedev->open) {
 438                 input_close_device(handle);
 439         } else {
 440                 if (mousedev_mix.open)
 441                         input_close_device(handle);
 442                 input_unregister_minor(mousedev->devfs);
 443                 mousedev_table[mousedev->minor] = NULL;
 444                 kfree(mousedev);
 445         }
 446 }
 447
 448 static struct input_handler mousedev_handler = {
 449         event:          mousedev_event,
 450         connect:        mousedev_connect,
 451         disconnect:     mousedev_disconnect,
 452         fops:           &mousedev_fops,
 453         minor:          MOUSEDEV_MINOR_BASE,
 454 };
 455
 456 static int __init mousedev_init(void)
 457 {
 458         input_register_handler(&mousedev_handler);
 459
 460         memset(&mousedev_mix, 0, sizeof(struct mousedev));
 461         init_waitqueue_head(&mousedev_mix.wait);
 462         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 463         mousedev_mix.exist = 1;
 464         mousedev_mix.minor = MOUSEDEV_MIX;
 465         mousedev_mix.devfs = input_register_minor("mice", MOUSEDEV_MIX, MOUSEDEV_MINOR_BASE);
 466
 467         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
 468
 469         return 0;
 470 }
 471
 472 static void __exit mousedev_exit(void)
 473 {
 474         input_unregister_minor(mousedev_mix.devfs);
 475         input_unregister_handler(&mousedev_handler);
 476 }
 477
 478 module_init(mousedev_init);
 479 module_exit(mousedev_exit);