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Sourcecode: wacom-tools version File versions

tabletdev.c

/*
 * $Id: tabletdev.c,v 1.1 2004/01/19 23:48:35 pingc Exp $
 *
 *  Copyright (c) 2003      John Joganic
 *
 *  Based on tabletdev.c
 *  Copyright (c) 1999-2002 Vojtech Pavlik
 *
 *  Input driver to tablet device driver module.
 *
 *  Sponsored by the Linux Wacom Project
 *
 *  REVISION HISTORY:
 *    2003-03-07 2.4.20-j0.5.0  JEJ - Created
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or 
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#define TABLETDEV_MINOR_BASE  196
#define TABLETDEV_MINORS            32
#define TABLETDEV_MIX               31

#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/config.h>
#include <linux/smp_lock.h>
#include <linux/random.h>

#if 0
#ifndef CONFIG_INPUT_TABLETDEV_SCREEN_X
#define CONFIG_INPUT_TABLETDEV_SCREEN_X   1024
#endif
#ifndef CONFIG_INPUT_TABLETDEV_SCREEN_Y
#define CONFIG_INPUT_TABLETDEV_SCREEN_Y   768
#endif
#endif

struct tabletdev {
      int exist;
      int open;
      int minor;
      wait_queue_head_t wait;
      struct tabletdev_list *list;
      struct input_handle handle;
      devfs_handle_t devfs;
};

struct tabletdev_list {
      struct fasync_struct *fasync;
      struct tabletdev *tabletdev;
      struct tabletdev_list *next;
//    int dx, dy, dz, oldx, oldy;
//    signed char ps2[6];
//    unsigned long buttons;
//    unsigned char ready, buffer, bufsiz;
//    unsigned char mode, imexseq, impsseq;
};

static struct tabletdev *tabletdev_table[TABLETDEV_MINORS];
static struct tabletdev tabletdev_mix;

#if 0


#define TABLETDEV_SEQ_LEN     6

static unsigned char tabletdev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
static unsigned char tabletdev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };

static struct input_handler tabletdev_handler;

static int xres = CONFIG_INPUT_TABLETDEV_SCREEN_X;
static int yres = CONFIG_INPUT_TABLETDEV_SCREEN_Y;

#endif

static void tabletdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
{
#if 0
      struct tabletdev *tabletdevs[3] = { handle->private, &tabletdev_mix, NULL };
      struct tabletdev **tabletdev = tabletdevs;
      struct tabletdev_list *list;
      int index, size;

      add_tablet_randomness((type << 4) ^ code ^ (code >> 4) ^ value);

      while (*tabletdev) {
            list = (*tabletdev)->list;
            while (list) {
                  switch (type) {
                        case EV_ABS:
                              if (test_bit(BTN_TRIGGER, handle->dev->keybit))
                                    break;
                              switch (code) {
                                    case ABS_X: 
                                          size = handle->dev->absmax[ABS_X] - handle->dev->absmin[ABS_X];
                                          list->dx += (value * xres - list->oldx) / size;
                                          list->oldx += list->dx * size;
                                          break;
                                    case ABS_Y:
                                          size = handle->dev->absmax[ABS_Y] - handle->dev->absmin[ABS_Y];
                                          list->dy -= (value * yres - list->oldy) / size;
                                          list->oldy -= list->dy * size;
                                          break;
                              }
                              break;

                        case EV_REL:
                              switch (code) {
                                    case REL_X: list->dx += value; break;
                                    case REL_Y: list->dy -= value; break;
                                    case REL_WHEEL:   if (list->mode) list->dz -= value; break;
                              }
                              break;

                        case EV_KEY:
                              switch (code) {
                                    case BTN_0:
                                    case BTN_TOUCH:
                                    case BTN_LEFT:   index = 0; break;
                                    case BTN_4:
                                    case BTN_EXTRA:  if (list->mode == 2) { index = 4; break; }
                                    case BTN_STYLUS:
                                    case BTN_1:
                                    case BTN_RIGHT:  index = 1; break;
                                    case BTN_3:
                                    case BTN_SIDE:   if (list->mode == 2) { index = 3; break; }
                                    case BTN_2:
                                    case BTN_STYLUS2:
                                    case BTN_MIDDLE: index = 2; break;  
                                    default: return;
                              }
                              switch (value) {
                                    case 0: clear_bit(index, &list->buttons); break;
                                    case 1: set_bit(index, &list->buttons); break;
                                    case 2: return;
                              }
                              break;
                  }
                              
                  list->ready = 1;

                  kill_fasync(&list->fasync, SIGIO, POLL_IN);

                  list = list->next;
            }

            wake_up_interruptible(&((*tabletdev)->wait));
            tabletdev++;
      }
#endif
}

static int tabletdev_fasync(int fd, struct file *file, int on)
{
#if 0
      int retval;
      struct tabletdev_list *list = file->private_data;
      retval = fasync_helper(fd, file, on, &list->fasync);
      return retval < 0 ? retval : 0;
#endif
      return 0;
}

static int tabletdev_release(struct inode * inode, struct file * file)
{
#if 0
      struct tabletdev_list *list = file->private_data;
      struct tabletdev_list **listptr;

      lock_kernel();
      listptr = &list->tabletdev->list;
      tabletdev_fasync(-1, file, 0);

      while (*listptr && (*listptr != list))
            listptr = &((*listptr)->next);
      *listptr = (*listptr)->next;

      if (!--list->tabletdev->open) {
            if (list->tabletdev->minor == TABLETDEV_MIX) {
                  struct input_handle *handle = tabletdev_handler.handle;
                  while (handle) {
                        struct tabletdev *tabletdev = handle->private;
                        if (!tabletdev->open) {
                              if (tabletdev->exist) {
                                    input_close_device(&tabletdev->handle);
                              } else {
                                    input_unregister_minor(tabletdev->devfs);
                                    tabletdev_table[tabletdev->minor] = NULL;
                                    kfree(tabletdev);
                              }
                        }
                        handle = handle->hnext;
                  }
            } else {
                  if (!tabletdev_mix.open) {
                        if (list->tabletdev->exist) {
                              input_close_device(&list->tabletdev->handle);
                        } else {
                              input_unregister_minor(list->tabletdev->devfs);
                              tabletdev_table[list->tabletdev->minor] = NULL;
                              kfree(list->tabletdev);
                        }
                  }
            }
      }
      
      kfree(list);
      unlock_kernel();

      return 0;
#endif
      return 0;
}

static int tabletdev_open(struct inode * inode, struct file * file)
{
#if 0
      struct tabletdev_list *list;
      int i = MINOR(inode->i_rdev) - TABLETDEV_MINOR_BASE;

      if (i >= TABLETDEV_MINORS || !tabletdev_table[i])
            return -ENODEV;

      if (!(list = kmalloc(sizeof(struct tabletdev_list), GFP_KERNEL)))
            return -ENOMEM;
      memset(list, 0, sizeof(struct tabletdev_list));

      list->tabletdev = tabletdev_table[i];
      list->next = tabletdev_table[i]->list;
      tabletdev_table[i]->list = list;
      file->private_data = list;

      if (!list->tabletdev->open++) {
            if (list->tabletdev->minor == TABLETDEV_MIX) {
                  struct input_handle *handle = tabletdev_handler.handle;
                  while (handle) {
                        struct tabletdev *tabletdev = handle->private;
                        if (!tabletdev->open)
                              if (tabletdev->exist)   
                                    input_open_device(handle);
                        handle = handle->hnext;
                  }
            } else {
                  if (!tabletdev_mix.open)
                        if (list->tabletdev->exist)   
                              input_open_device(&list->tabletdev->handle);
            }
      }

      return 0;
#endif
      return 0;
}

#if 0
static void tabletdev_packet(struct tabletdev_list *list, unsigned char off)
{
      list->ps2[off] = 0x08 | ((list->dx < 0) << 4) | ((list->dy < 0) << 5) | (list->buttons & 0x07);
      list->ps2[off + 1] = (list->dx > 127 ? 127 : (list->dx < -127 ? -127 : list->dx));
      list->ps2[off + 2] = (list->dy > 127 ? 127 : (list->dy < -127 ? -127 : list->dy));
      list->dx -= list->ps2[off + 1];
      list->dy -= list->ps2[off + 2];
      list->bufsiz = off + 3;

      if (list->mode == 2) {
            list->ps2[off + 3] = (list->dz > 7 ? 7 : (list->dz < -7 ? -7 : list->dz));
            list->dz -= list->ps2[off + 3];
            list->ps2[off + 3] = (list->ps2[off + 3] & 0x0f) | ((list->buttons & 0x18) << 1);
            list->bufsiz++;
      }
      
      if (list->mode == 1) {
            list->ps2[off + 3] = (list->dz > 127 ? 127 : (list->dz < -127 ? -127 : list->dz));
            list->dz -= list->ps2[off + 3];
            list->bufsiz++;
      }

      if (!list->dx && !list->dy && (!list->mode || !list->dz)) list->ready = 0;
      list->buffer = list->bufsiz;
}
#endif

static ssize_t tabletdev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
{
#if 0
      struct tabletdev_list *list = file->private_data;
      unsigned char c;
      int i;

      for (i = 0; i < count; i++) {

            if (get_user(c, buffer + i))
                  return -EFAULT;

            if (c == tabletdev_imex_seq[list->imexseq]) {
                  if (++list->imexseq == TABLETDEV_SEQ_LEN) {
                        list->imexseq = 0;
                        list->mode = 2;
                  }
            } else list->imexseq = 0;

            if (c == tabletdev_imps_seq[list->impsseq]) {
                  if (++list->impsseq == TABLETDEV_SEQ_LEN) {
                        list->impsseq = 0;
                        list->mode = 1;
                  }
            } else list->impsseq = 0;

            list->ps2[0] = 0xfa;
            list->bufsiz = 1;
            list->ready = 1;

            switch (c) {

                  case 0xeb: /* Poll */
                        tabletdev_packet(list, 1);
                        break;

                  case 0xf2: /* Get ID */
                        switch (list->mode) {
                              case 0: list->ps2[1] = 0; break;
                              case 1: list->ps2[1] = 3; break;
                              case 2: list->ps2[1] = 4; break;
                        }
                        list->bufsiz = 2;
                        break;

                  case 0xe9: /* Get info */
                        list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
                        list->bufsiz = 4;
                        break;
            }

            list->buffer = list->bufsiz;
      }

      kill_fasync(&list->fasync, SIGIO, POLL_IN);

      wake_up_interruptible(&list->tabletdev->wait);
            
      return count;
#endif
      return 0;
}

static ssize_t tabletdev_read(struct file * file, char * buffer, size_t count, loff_t *ppos)
{
#if 0
      DECLARE_WAITQUEUE(wait, current);
      struct tabletdev_list *list = file->private_data;
      int retval = 0;

      if (!list->ready && !list->buffer) {

            add_wait_queue(&list->tabletdev->wait, &wait);
            current->state = TASK_INTERRUPTIBLE;

            while (!list->ready) {

                  if (file->f_flags & O_NONBLOCK) {
                        retval = -EAGAIN;
                        break;
                  }
                  if (signal_pending(current)) {
                        retval = -ERESTARTSYS;
                        break;
                  }

                  schedule();
            }

            current->state = TASK_RUNNING;
            remove_wait_queue(&list->tabletdev->wait, &wait);
      }

      if (retval)
            return retval;

      if (!list->buffer)
            tabletdev_packet(list, 0);

      if (count > list->buffer)
            count = list->buffer;

      if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer, count))
            return -EFAULT;
      
      list->buffer -= count;

      return count;     
#endif
      return 0;
}

/* No kernel lock - fine */
static unsigned int tabletdev_poll(struct file *file, poll_table *wait)
{
#if 0
      struct tabletdev_list *list = file->private_data;
      poll_wait(file, &list->tabletdev->wait, wait);
      if (list->ready || list->buffer)
            return POLLIN | POLLRDNORM;
      return 0;
#endif
      return 0;
}

struct file_operations tabletdev_fops = {
      owner:            THIS_MODULE,
      read:       tabletdev_read,
      write:            tabletdev_write,
      poll:       tabletdev_poll,
      open:       tabletdev_open,
      release:    tabletdev_release,
      fasync:           tabletdev_fasync,
};

static struct input_handle *tabletdev_connect(struct input_handler *handler, struct input_dev *dev)
{
      printk(KERN_INFO "tabletdev: looking at device %X:%X\n",
                  dev->idvendor, dev->idproduct);
#if 0
      struct tabletdev *tabletdev;
      int minor = 0;

      if (!test_bit(EV_KEY, dev->evbit) ||
         (!test_bit(BTN_LEFT, dev->keybit) && !test_bit(BTN_TOUCH, dev->keybit)))
            return NULL;

      if ((!test_bit(EV_REL, dev->evbit) || !test_bit(REL_X, dev->relbit)) &&
          (!test_bit(EV_ABS, dev->evbit) || !test_bit(ABS_X, dev->absbit)))
            return NULL;

      for (minor = 0; minor < TABLETDEV_MINORS && tabletdev_table[minor]; minor++);
      if (minor == TABLETDEV_MINORS) {
            printk(KERN_ERR "tabletdev: no more free tabletdev devices\n");
            return NULL;
      }

      if (!(tabletdev = kmalloc(sizeof(struct tabletdev), GFP_KERNEL)))
            return NULL;
      memset(tabletdev, 0, sizeof(struct tabletdev));
      init_waitqueue_head(&tabletdev->wait);

      tabletdev->exist = 1;
      tabletdev->minor = minor;
      tabletdev_table[minor] = tabletdev;

      tabletdev->handle.dev = dev;
      tabletdev->handle.handler = handler;
      tabletdev->handle.private = tabletdev;

      tabletdev->devfs = input_register_minor("tablet%d", minor, TABLETDEV_MINOR_BASE);

      if (tabletdev_mix.open)
            input_open_device(&tabletdev->handle);

//    printk(KERN_INFO "tablet%d: tablet device for input%d\n", minor, dev->number);

      return &tabletdev->handle;
#endif
      return NULL;
}

static void tabletdev_disconnect(struct input_handle *handle)
{
#if 0
      struct tabletdev *tabletdev = handle->private;

      tabletdev->exist = 0;

      if (tabletdev->open) {
            input_close_device(handle);
      } else {
            if (tabletdev_mix.open)
                  input_close_device(handle);
            input_unregister_minor(tabletdev->devfs);
            tabletdev_table[tabletdev->minor] = NULL;
            kfree(tabletdev);
      }
#endif
}

static struct input_handler tabletdev_handler = {
      event:            tabletdev_event,
      connect:    tabletdev_connect,
      disconnect: tabletdev_disconnect,
      fops:       &tabletdev_fops,
      minor:            TABLETDEV_MINOR_BASE,
};

static int __init tabletdev_init(void)
{
      input_register_handler(&tabletdev_handler);

      memset(&tabletdev_mix, 0, sizeof(struct tabletdev));
      init_waitqueue_head(&tabletdev_mix.wait);
      tabletdev_table[TABLETDEV_MIX] = &tabletdev_mix;
      tabletdev_mix.exist = 1;
      tabletdev_mix.minor = TABLETDEV_MIX;
      tabletdev_mix.devfs = input_register_minor("tablets",
                  TABLETDEV_MIX, TABLETDEV_MINOR_BASE);

      printk(KERN_INFO "tablets: tablet device common for all tablets\n");

      return 0;
}

static void __exit tabletdev_exit(void)
{
      input_unregister_minor(tabletdev_mix.devfs);
      input_unregister_handler(&tabletdev_handler);
}

module_init(tabletdev_init);
module_exit(tabletdev_exit);

MODULE_AUTHOR("John Joganic <john@joganic.com>");
MODULE_DESCRIPTION("Input driver for tablet devices");
MODULE_LICENSE("GPL");

#if 0
MODULE_PARM(xres, "i");
MODULE_PARM_DESC(xres, "Horizontal screen resolution");
MODULE_PARM(yres, "i");
MODULE_PARM_DESC(yres, "Vertical screen resolution");
#endif

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