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Sourcecode: wacom-tools version File versions

mousedev.c

/*
 * $Id: mousedev.c,v 1.1 2003/11/10 20:00:02 pingc Exp $
 *
 *  Copyright (c) 1999-2000 Vojtech Pavlik
 *  Copyright (c) 2003 John Joganic         <john@joganic.com>
 *
 *  Input driver to ImExPS/2 device driver module.
 *
 *  Sponsored by SuSE
 *
 *  Revision History - AS BRANCH FROM LINUX WACOM PROJECT
 *  2003-03-31  2.4.20-j0.5.0  - Added to Linux Wacom project
 *                               Applied exception for wacom tablets
 * 
 */

/*
 * 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
 * 
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
 * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
 */

#define MOUSEDEV_VERSION "2.4.20-j0.5.0"

#include <linux/autoconf.h>
#if defined(CONFIG_MODVERSIONS) && !defined(MODVERSIONS)
#   define MODVERSIONS
#endif

#ifdef MODVERSIONS
#include <linux/modversions.h>
#endif

#define MOUSEDEV_MINOR_BASE   32
#define MOUSEDEV_MINORS       32
#define MOUSEDEV_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>

#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
#define CONFIG_INPUT_MOUSEDEV_SCREEN_X    1024
#endif
#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
#define CONFIG_INPUT_MOUSEDEV_SCREEN_Y    768
#endif

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

struct mousedev_list {
      struct fasync_struct *fasync;
      struct mousedev *mousedev;
      struct mousedev_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;
};

#define MOUSEDEV_SEQ_LEN      6

static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };

static struct input_handler mousedev_handler;

static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
static struct mousedev mousedev_mix;

static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;

static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
{
      struct mousedev *mousedevs[3] = { handle->private, &mousedev_mix, NULL };
      struct mousedev **mousedev = mousedevs;
      struct mousedev_list *list;
      int index, size;

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

      while (*mousedev) {
            list = (*mousedev)->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(&((*mousedev)->wait));
            mousedev++;
      }
}

static int mousedev_fasync(int fd, struct file *file, int on)
{
      int retval;
      struct mousedev_list *list = file->private_data;
      retval = fasync_helper(fd, file, on, &list->fasync);
      return retval < 0 ? retval : 0;
}

static int mousedev_release(struct inode * inode, struct file * file)
{
      struct mousedev_list *list = file->private_data;
      struct mousedev_list **listptr;

      lock_kernel();
      listptr = &list->mousedev->list;
      mousedev_fasync(-1, file, 0);

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

      if (!--list->mousedev->open) {
            if (list->mousedev->minor == MOUSEDEV_MIX) {
                  struct input_handle *handle = mousedev_handler.handle;
                  while (handle) {
                        struct mousedev *mousedev = handle->private;
                        if (!mousedev->open) {
                              if (mousedev->exist) {
                                    input_close_device(&mousedev->handle);
                              } else {
                                    input_unregister_minor(mousedev->devfs);
                                    mousedev_table[mousedev->minor] = NULL;
                                    kfree(mousedev);
                              }
                        }
                        handle = handle->hnext;
                  }
            } else {
                  if (!mousedev_mix.open) {
                        if (list->mousedev->exist) {
                              input_close_device(&list->mousedev->handle);
                        } else {
                              input_unregister_minor(list->mousedev->devfs);
                              mousedev_table[list->mousedev->minor] = NULL;
                              kfree(list->mousedev);
                        }
                  }
            }
      }
      
      kfree(list);
      unlock_kernel();

      return 0;
}

static int mousedev_open(struct inode * inode, struct file * file)
{
      struct mousedev_list *list;
      int i = MINOR(inode->i_rdev) - MOUSEDEV_MINOR_BASE;

      if (i >= MOUSEDEV_MINORS || !mousedev_table[i])
            return -ENODEV;

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

      list->mousedev = mousedev_table[i];
      list->next = mousedev_table[i]->list;
      mousedev_table[i]->list = list;
      file->private_data = list;

      if (!list->mousedev->open++) {
            if (list->mousedev->minor == MOUSEDEV_MIX) {
                  struct input_handle *handle = mousedev_handler.handle;
                  while (handle) {
                        struct mousedev *mousedev = handle->private;
                        if (!mousedev->open)
                              if (mousedev->exist)    
                                    input_open_device(handle);
                        handle = handle->hnext;
                  }
            } else {
                  if (!mousedev_mix.open)
                        if (list->mousedev->exist)    
                              input_open_device(&list->mousedev->handle);
            }
      }

      return 0;
}

static void mousedev_packet(struct mousedev_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;
}


static ssize_t mousedev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
{
      struct mousedev_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 == mousedev_imex_seq[list->imexseq]) {
                  if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
                        list->imexseq = 0;
                        list->mode = 2;
                  }
            } else list->imexseq = 0;

            if (c == mousedev_imps_seq[list->impsseq]) {
                  if (++list->impsseq == MOUSEDEV_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 */
                        mousedev_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->mousedev->wait);
            
      return count;
}

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

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

            add_wait_queue(&list->mousedev->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->mousedev->wait, &wait);
      }

      if (retval)
            return retval;

      if (!list->buffer)
            mousedev_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;     
}

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

struct file_operations mousedev_fops = {
      owner:            THIS_MODULE,
      read:       mousedev_read,
      write:            mousedev_write,
      poll:       mousedev_poll,
      open:       mousedev_open,
      release:    mousedev_release,
      fasync:           mousedev_fasync,
};

static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev)
{
      struct mousedev *mousedev;
      int minor = 0;

      /* Ignore all wacom tablets */
      if (dev->idvendor == 0x56a)
      {
            printk(KERN_INFO "mousedev.c: Ignoring wacom tablet\n");
            return NULL;
      }

      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 < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
      if (minor == MOUSEDEV_MINORS) {
            printk(KERN_ERR "mousedev: no more free mousedev devices\n");
            return NULL;
      }

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

      mousedev->exist = 1;
      mousedev->minor = minor;
      mousedev_table[minor] = mousedev;

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

      mousedev->devfs = input_register_minor("mouse%d", minor, MOUSEDEV_MINOR_BASE);

      if (mousedev_mix.open)
            input_open_device(&mousedev->handle);

//    printk(KERN_INFO "mouse%d: PS/2 mouse device for input%d\n", minor, dev->number);

      return &mousedev->handle;
}

static void mousedev_disconnect(struct input_handle *handle)
{
      struct mousedev *mousedev = handle->private;

      mousedev->exist = 0;

      if (mousedev->open) {
            input_close_device(handle);
      } else {
            if (mousedev_mix.open)
                  input_close_device(handle);
            input_unregister_minor(mousedev->devfs);
            mousedev_table[mousedev->minor] = NULL;
            kfree(mousedev);
      }
}
      
static struct input_handler mousedev_handler = {
      event:            mousedev_event,
      connect:    mousedev_connect,
      disconnect: mousedev_disconnect,
      fops:       &mousedev_fops,
      minor:            MOUSEDEV_MINOR_BASE,
};

static int __init mousedev_init(void)
{
      printk(KERN_INFO "mousedev.c: version " MOUSEDEV_VERSION "\n");
      input_register_handler(&mousedev_handler);

      memset(&mousedev_mix, 0, sizeof(struct mousedev));
      init_waitqueue_head(&mousedev_mix.wait);
      mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
      mousedev_mix.exist = 1;
      mousedev_mix.minor = MOUSEDEV_MIX;
      mousedev_mix.devfs = input_register_minor("mice", MOUSEDEV_MIX, MOUSEDEV_MINOR_BASE);

      printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");

      return 0;
}

static void __exit mousedev_exit(void)
{
      input_unregister_minor(mousedev_mix.devfs);
      input_unregister_handler(&mousedev_handler);
}

module_init(mousedev_init);
module_exit(mousedev_exit);

MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
#ifndef __JEJ_DEBUG
MODULE_DESCRIPTION("Input driver to PS/2 or ImPS/2 device driver (LINUXWACOM-DEBUG)");
#else
MODULE_DESCRIPTION("Input driver to PS/2 or ImPS/2 device driver (LINUXWACOM)");
#endif
MODULE_LICENSE("GPL");

MODULE_PARM(xres, "i");
MODULE_PARM_DESC(xres, "Horizontal screen resolution");
MODULE_PARM(yres, "i");
MODULE_PARM_DESC(yres, "Vertical screen resolution");

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