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pms.c

/*
 *    Media Vision Pro Movie Studio
 *                or
 *    "all you need is an I2C bus some RAM and a prayer"
 *
 *    This draws heavily on code
 *
 *    (c) Wolfgang Koehler,  wolf@first.gmd.de, Dec. 1994
 *    Kiefernring 15
 *    14478 Potsdam, Germany
 *
 *    Most of this code is directly derived from his userspace driver.
 *    His driver works so send any reports to alan@redhat.com unless the
 *    userspace driver also doesn't work for you...
 *
 *      Changes:
 *      08/07/2003        Daniele Bellucci <bellucda@tiscali.it>
 *                        - pms_capture: report back -EFAULT
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/mutex.h>

#include <asm/uaccess.h>


#define MOTOROLA  1
#define PHILIPS2  2
#define PHILIPS1  3
#define MVVMEMORYWIDTH  0x40        /* 512 bytes */

struct pms_device
{
      struct video_device v;
      struct video_picture picture;
      int height;
      int width;
      struct mutex lock;
};

struct i2c_info
{
      u8 slave;
      u8 sub;
      u8 data;
      u8 hits;
};

static int i2c_count          = 0;
static struct i2c_info i2cinfo[64];

static int decoder            = PHILIPS2;
static int standard           = 0;  /* 0 - auto 1 - ntsc 2 - pal 3 - secam */

/*
 *    I/O ports and Shared Memory
 */

static int io_port            =     0x250;
static int data_port          =     0x251;
static int mem_base           =     0xC8000;
static void __iomem *mem;
static int video_nr             =       -1;



static inline void mvv_write(u8 index, u8 value)
{
      outw(index|(value<<8), io_port);
}

static inline u8 mvv_read(u8 index)
{
      outb(index, io_port);
      return inb(data_port);
}

static int pms_i2c_stat(u8 slave)
{
      int counter;
      int i;

      outb(0x28, io_port);

      counter=0;
      while((inb(data_port)&0x01)==0)
            if(counter++==256)
                  break;

      while((inb(data_port)&0x01)!=0)
            if(counter++==256)
                  break;

      outb(slave, io_port);

      counter=0;
      while((inb(data_port)&0x01)==0)
            if(counter++==256)
                  break;

      while((inb(data_port)&0x01)!=0)
            if(counter++==256)
                  break;

      for(i=0;i<12;i++)
      {
            char st=inb(data_port);
            if((st&2)!=0)
                  return -1;
            if((st&1)==0)
                  break;
      }
      outb(0x29, io_port);
      return inb(data_port);
}

static int pms_i2c_write(u16 slave, u16 sub, u16 data)
{
      int skip=0;
      int count;
      int i;

      for(i=0;i<i2c_count;i++)
      {
            if((i2cinfo[i].slave==slave) &&
               (i2cinfo[i].sub == sub))
            {
                  if(i2cinfo[i].data==data)
                        skip=1;
                  i2cinfo[i].data=data;
                  i=i2c_count+1;
            }
      }

      if(i==i2c_count && i2c_count<64)
      {
            i2cinfo[i2c_count].slave=slave;
            i2cinfo[i2c_count].sub=sub;
            i2cinfo[i2c_count].data=data;
            i2c_count++;
      }

      if(skip)
            return 0;

      mvv_write(0x29, sub);
      mvv_write(0x2A, data);
      mvv_write(0x28, slave);

      outb(0x28, io_port);

      count=0;
      while((inb(data_port)&1)==0)
            if(count>255)
                  break;
      while((inb(data_port)&1)!=0)
            if(count>255)
                  break;

      count=inb(data_port);

      if(count&2)
            return -1;
      return count;
}

static int pms_i2c_read(int slave, int sub)
{
      int i=0;
      for(i=0;i<i2c_count;i++)
      {
            if(i2cinfo[i].slave==slave && i2cinfo[i].sub==sub)
                  return i2cinfo[i].data;
      }
      return 0;
}


static void pms_i2c_andor(int slave, int sub, int and, int or)
{
      u8 tmp;

      tmp=pms_i2c_read(slave, sub);
      tmp = (tmp&and)|or;
      pms_i2c_write(slave, sub, tmp);
}

/*
 *    Control functions
 */


static void pms_videosource(short source)
{
      mvv_write(0x2E, source?0x31:0x30);
}

static void pms_hue(short hue)
{
      switch(decoder)
      {
            case MOTOROLA:
                  pms_i2c_write(0x8A, 0x00, hue);
                  break;
            case PHILIPS2:
                  pms_i2c_write(0x8A, 0x07, hue);
                  break;
            case PHILIPS1:
                  pms_i2c_write(0x42, 0x07, hue);
                  break;
      }
}

static void pms_colour(short colour)
{
      switch(decoder)
      {
            case MOTOROLA:
                  pms_i2c_write(0x8A, 0x00, colour);
                  break;
            case PHILIPS1:
                  pms_i2c_write(0x42, 0x12, colour);
                  break;
      }
}


static void pms_contrast(short contrast)
{
      switch(decoder)
      {
            case MOTOROLA:
                  pms_i2c_write(0x8A, 0x00, contrast);
                  break;
            case PHILIPS1:
                  pms_i2c_write(0x42, 0x13, contrast);
                  break;
      }
}

static void pms_brightness(short brightness)
{
      switch(decoder)
      {
            case MOTOROLA:
                  pms_i2c_write(0x8A, 0x00, brightness);
                  pms_i2c_write(0x8A, 0x00, brightness);
                  pms_i2c_write(0x8A, 0x00, brightness);
                  break;
            case PHILIPS1:
                  pms_i2c_write(0x42, 0x19, brightness);
                  break;
      }
}


static void pms_format(short format)
{
      int target;
      standard = format;

      if(decoder==PHILIPS1)
            target=0x42;
      else if(decoder==PHILIPS2)
            target=0x8A;
      else
            return;

      switch(format)
      {
            case 0:     /* Auto */
                  pms_i2c_andor(target, 0x0D, 0xFE,0x00);
                  pms_i2c_andor(target, 0x0F, 0x3F,0x80);
                  break;
            case 1: /* NTSC */
                  pms_i2c_andor(target, 0x0D, 0xFE, 0x00);
                  pms_i2c_andor(target, 0x0F, 0x3F, 0x40);
                  break;
            case 2: /* PAL */
                  pms_i2c_andor(target, 0x0D, 0xFE, 0x00);
                  pms_i2c_andor(target, 0x0F, 0x3F, 0x00);
                  break;
            case 3:     /* SECAM */
                  pms_i2c_andor(target, 0x0D, 0xFE, 0x01);
                  pms_i2c_andor(target, 0x0F, 0x3F, 0x00);
                  break;
      }
}

#ifdef FOR_FUTURE_EXPANSION

/*
 *    These features of the PMS card are not currently exposes. They
 *    could become a private v4l ioctl for PMSCONFIG or somesuch if
 *    people need it. We also don't yet use the PMS interrupt.
 */

static void pms_hstart(short start)
{
      switch(decoder)
      {
            case PHILIPS1:
                  pms_i2c_write(0x8A, 0x05, start);
                  pms_i2c_write(0x8A, 0x18, start);
                  break;
            case PHILIPS2:
                  pms_i2c_write(0x42, 0x05, start);
                  pms_i2c_write(0x42, 0x18, start);
                  break;
      }
}

/*
 *    Bandpass filters
 */

static void pms_bandpass(short pass)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0x8A, 0x06, 0xCF, (pass&0x03)<<4);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x06, 0xCF, (pass&0x03)<<4);
}

static void pms_antisnow(short snow)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0x8A, 0x06, 0xF3, (snow&0x03)<<2);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x06, 0xF3, (snow&0x03)<<2);
}

static void pms_sharpness(short sharp)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0x8A, 0x06, 0xFC, sharp&0x03);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x06, 0xFC, sharp&0x03);
}

static void pms_chromaagc(short agc)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0x8A, 0x0C, 0x9F, (agc&0x03)<<5);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x0C, 0x9F, (agc&0x03)<<5);
}

static void pms_vertnoise(short noise)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0x8A, 0x10, 0xFC, noise&3);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x10, 0xFC, noise&3);
}

static void pms_forcecolour(short colour)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0x8A, 0x0C, 0x7F, (colour&1)<<7);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x0C, 0x7, (colour&1)<<7);
}

static void pms_antigamma(short gamma)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0xB8, 0x00, 0x7F, (gamma&1)<<7);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x20, 0x7, (gamma&1)<<7);
}

static void pms_prefilter(short filter)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0x8A, 0x06, 0xBF, (filter&1)<<6);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x06, 0xBF, (filter&1)<<6);
}

static void pms_hfilter(short filter)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0xB8, 0x04, 0x1F, (filter&7)<<5);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x24, 0x1F, (filter&7)<<5);
}

static void pms_vfilter(short filter)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0xB8, 0x08, 0x9F, (filter&3)<<5);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x28, 0x9F, (filter&3)<<5);
}

static void pms_killcolour(short colour)
{
      if(decoder==PHILIPS2)
      {
            pms_i2c_andor(0x8A, 0x08, 0x07, (colour&0x1F)<<3);
            pms_i2c_andor(0x8A, 0x09, 0x07, (colour&0x1F)<<3);
      }
      else if(decoder==PHILIPS1)
      {
            pms_i2c_andor(0x42, 0x08, 0x07, (colour&0x1F)<<3);
            pms_i2c_andor(0x42, 0x09, 0x07, (colour&0x1F)<<3);
      }
}

static void pms_chromagain(short chroma)
{
      if(decoder==PHILIPS2)
      {
            pms_i2c_write(0x8A, 0x11, chroma);
      }
      else if(decoder==PHILIPS1)
      {
            pms_i2c_write(0x42, 0x11, chroma);
      }
}


static void pms_spacialcompl(short data)
{
      mvv_write(0x3B, data);
}

static void pms_spacialcomph(short data)
{
      mvv_write(0x3A, data);
}

static void pms_vstart(short start)
{
      mvv_write(0x16, start);
      mvv_write(0x17, (start>>8)&0x01);
}

#endif

static void pms_secamcross(short cross)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0x8A, 0x0F, 0xDF, (cross&1)<<5);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42, 0x0F, 0xDF, (cross&1)<<5);
}


static void pms_swsense(short sense)
{
      if(decoder==PHILIPS2)
      {
            pms_i2c_write(0x8A, 0x0A, sense);
            pms_i2c_write(0x8A, 0x0B, sense);
      }
      else if(decoder==PHILIPS1)
      {
            pms_i2c_write(0x42, 0x0A, sense);
            pms_i2c_write(0x42, 0x0B, sense);
      }
}


static void pms_framerate(short frr)
{
      int fps=(standard==1)?30:25;
      if(frr==0)
            return;
      fps=fps/frr;
      mvv_write(0x14,0x80|fps);
      mvv_write(0x15,1);
}

static void pms_vert(u8 deciden, u8 decinum)
{
      mvv_write(0x1C, deciden);     /* Denominator */
      mvv_write(0x1D, decinum);     /* Numerator */
}

/*
 *    Turn 16bit ratios into best small ratio the chipset can grok
 */

static void pms_vertdeci(unsigned short decinum, unsigned short deciden)
{
      /* Knock it down by /5 once */
      if(decinum%5==0)
      {
            deciden/=5;
            decinum/=5;
      }
      /*
       *    3's
       */
      while(decinum%3==0 && deciden%3==0)
      {
            deciden/=3;
            decinum/=3;
      }
      /*
       *    2's
       */
      while(decinum%2==0 && deciden%2==0)
      {
            decinum/=2;
            deciden/=2;
      }
      /*
       *    Fudgyify
       */
      while(deciden>32)
      {
            deciden/=2;
            decinum=(decinum+1)/2;
      }
      if(deciden==32)
            deciden--;
      pms_vert(deciden,decinum);
}

static void pms_horzdeci(short decinum, short deciden)
{
      if(decinum<=512)
      {
            if(decinum%5==0)
            {
                  decinum/=5;
                  deciden/=5;
            }
      }
      else
      {
            decinum=512;
            deciden=640;      /* 768 would be ideal */
      }

      while(((decinum|deciden)&1)==0)
      {
            decinum>>=1;
            deciden>>=1;
      }
      while(deciden>32)
      {
            deciden>>=1;
            decinum=(decinum+1)>>1;
      }
      if(deciden==32)
            deciden--;

      mvv_write(0x24, 0x80|deciden);
      mvv_write(0x25, decinum);
}

static void pms_resolution(short width, short height)
{
      int fg_height;

      fg_height=height;
      if(fg_height>280)
            fg_height=280;

      mvv_write(0x18, fg_height);
      mvv_write(0x19, fg_height>>8);

      if(standard==1)
      {
            mvv_write(0x1A, 0xFC);
            mvv_write(0x1B, 0x00);
            if(height>fg_height)
                  pms_vertdeci(240,240);
            else
                  pms_vertdeci(fg_height,240);
      }
      else
      {
            mvv_write(0x1A, 0x1A);
            mvv_write(0x1B, 0x01);
            if(fg_height>256)
                  pms_vertdeci(270,270);
            else
                  pms_vertdeci(fg_height, 270);
      }
      mvv_write(0x12,0);
      mvv_write(0x13, MVVMEMORYWIDTH);
      mvv_write(0x42, 0x00);
      mvv_write(0x43, 0x00);
      mvv_write(0x44, MVVMEMORYWIDTH);

      mvv_write(0x22, width+8);
      mvv_write(0x23, (width+8)>> 8);

      if(standard==1)
            pms_horzdeci(width,640);
      else
            pms_horzdeci(width+8, 768);

      mvv_write(0x30, mvv_read(0x30)&0xFE);
      mvv_write(0x08, mvv_read(0x08)|0x01);
      mvv_write(0x01, mvv_read(0x01)&0xFD);
      mvv_write(0x32, 0x00);
      mvv_write(0x33, MVVMEMORYWIDTH);
}


/*
 *    Set Input
 */

static void pms_vcrinput(short input)
{
      if(decoder==PHILIPS2)
            pms_i2c_andor(0x8A,0x0D,0x7F,(input&1)<<7);
      else if(decoder==PHILIPS1)
            pms_i2c_andor(0x42,0x0D,0x7F,(input&1)<<7);
}


static int pms_capture(struct pms_device *dev, char __user *buf, int rgb555, int count)
{
      int y;
      int dw = 2*dev->width;

      char tmp[dw+32]; /* using a temp buffer is faster than direct  */
      int cnt = 0;
      int len=0;
      unsigned char r8 = 0x5;  /* value for reg8  */

      if (rgb555)
            r8 |= 0x20; /* else use untranslated rgb = 565 */
      mvv_write(0x08,r8); /* capture rgb555/565, init DRAM, PC enable */

/*    printf("%d %d %d %d %d %x %x\n",width,height,voff,nom,den,mvv_buf); */

      for (y = 0; y < dev->height; y++ )
      {
            writeb(0, mem);  /* synchronisiert neue Zeile */

            /*
             *    This is in truth a fifo, be very careful as if you
             *    forgot this odd things will occur 8)
             */

            memcpy_fromio(tmp, mem, dw+32); /* discard 16 word   */
            cnt -= dev->height;
            while (cnt <= 0)
            {
                  /*
                   *    Don't copy too far
                   */
                  int dt=dw;
                  if(dt+len>count)
                        dt=count-len;
                  cnt += dev->height;
                  if (copy_to_user(buf, tmp+32, dt))
                        return len ? len : -EFAULT;
                  buf += dt;
                  len += dt;
            }
      }
      return len;
}


/*
 *    Video4linux interfacing
 */

static int pms_do_ioctl(struct inode *inode, struct file *file,
                  unsigned int cmd, void *arg)
{
      struct video_device *dev = video_devdata(file);
      struct pms_device *pd=(struct pms_device *)dev;

      switch(cmd)
      {
            case VIDIOCGCAP:
            {
                  struct video_capability *b = arg;
                  strcpy(b->name, "Mediavision PMS");
                  b->type = VID_TYPE_CAPTURE|VID_TYPE_SCALES;
                  b->channels = 4;
                  b->audios = 0;
                  b->maxwidth = 640;
                  b->maxheight = 480;
                  b->minwidth = 16;
                  b->minheight = 16;
                  return 0;
            }
            case VIDIOCGCHAN:
            {
                  struct video_channel *v = arg;
                  if(v->channel<0 || v->channel>3)
                        return -EINVAL;
                  v->flags=0;
                  v->tuners=1;
                  /* Good question.. its composite or SVHS so.. */
                  v->type = VIDEO_TYPE_CAMERA;
                  switch(v->channel)
                  {
                        case 0:
                              strcpy(v->name, "Composite");break;
                        case 1:
                              strcpy(v->name, "SVideo");break;
                        case 2:
                              strcpy(v->name, "Composite(VCR)");break;
                        case 3:
                              strcpy(v->name, "SVideo(VCR)");break;
                  }
                  return 0;
            }
            case VIDIOCSCHAN:
            {
                  struct video_channel *v = arg;
                  if(v->channel<0 || v->channel>3)
                        return -EINVAL;
                  mutex_lock(&pd->lock);
                  pms_videosource(v->channel&1);
                  pms_vcrinput(v->channel>>1);
                  mutex_unlock(&pd->lock);
                  return 0;
            }
            case VIDIOCGTUNER:
            {
                  struct video_tuner *v = arg;
                  if(v->tuner)
                        return -EINVAL;
                  strcpy(v->name, "Format");
                  v->rangelow=0;
                  v->rangehigh=0;
                  v->flags= VIDEO_TUNER_PAL|VIDEO_TUNER_NTSC|VIDEO_TUNER_SECAM;
                  switch(standard)
                  {
                        case 0:
                              v->mode = VIDEO_MODE_AUTO;
                              break;
                        case 1:
                              v->mode = VIDEO_MODE_NTSC;
                              break;
                        case 2:
                              v->mode = VIDEO_MODE_PAL;
                              break;
                        case 3:
                              v->mode = VIDEO_MODE_SECAM;
                              break;
                  }
                  return 0;
            }
            case VIDIOCSTUNER:
            {
                  struct video_tuner *v = arg;
                  if(v->tuner)
                        return -EINVAL;
                  mutex_lock(&pd->lock);
                  switch(v->mode)
                  {
                        case VIDEO_MODE_AUTO:
                              pms_framerate(25);
                              pms_secamcross(0);
                              pms_format(0);
                              break;
                        case VIDEO_MODE_NTSC:
                              pms_framerate(30);
                              pms_secamcross(0);
                              pms_format(1);
                              break;
                        case VIDEO_MODE_PAL:
                              pms_framerate(25);
                              pms_secamcross(0);
                              pms_format(2);
                              break;
                        case VIDEO_MODE_SECAM:
                              pms_framerate(25);
                              pms_secamcross(1);
                              pms_format(2);
                              break;
                        default:
                              mutex_unlock(&pd->lock);
                              return -EINVAL;
                  }
                  mutex_unlock(&pd->lock);
                  return 0;
            }
            case VIDIOCGPICT:
            {
                  struct video_picture *p = arg;
                  *p = pd->picture;
                  return 0;
            }
            case VIDIOCSPICT:
            {
                  struct video_picture *p = arg;
                  if(!((p->palette==VIDEO_PALETTE_RGB565 && p->depth==16)
                      ||(p->palette==VIDEO_PALETTE_RGB555 && p->depth==15)))
                        return -EINVAL;
                  pd->picture= *p;

                  /*
                   *    Now load the card.
                   */

                  mutex_lock(&pd->lock);
                  pms_brightness(p->brightness>>8);
                  pms_hue(p->hue>>8);
                  pms_colour(p->colour>>8);
                  pms_contrast(p->contrast>>8);
                  mutex_unlock(&pd->lock);
                  return 0;
            }
            case VIDIOCSWIN:
            {
                  struct video_window *vw = arg;
                  if(vw->flags)
                        return -EINVAL;
                  if(vw->clipcount)
                        return -EINVAL;
                  if(vw->height<16||vw->height>480)
                        return -EINVAL;
                  if(vw->width<16||vw->width>640)
                        return -EINVAL;
                  pd->width=vw->width;
                  pd->height=vw->height;
                  mutex_lock(&pd->lock);
                  pms_resolution(pd->width, pd->height);
                  mutex_unlock(&pd->lock);                  /* Ok we figured out what to use from our wide choice */
                  return 0;
            }
            case VIDIOCGWIN:
            {
                  struct video_window *vw = arg;
                  memset(vw,0,sizeof(*vw));
                  vw->width=pd->width;
                  vw->height=pd->height;
                  return 0;
            }
            case VIDIOCKEY:
                  return 0;
            case VIDIOCCAPTURE:
            case VIDIOCGFBUF:
            case VIDIOCSFBUF:
            case VIDIOCGFREQ:
            case VIDIOCSFREQ:
            case VIDIOCGAUDIO:
            case VIDIOCSAUDIO:
                  return -EINVAL;
            default:
                  return -ENOIOCTLCMD;
      }
      return 0;
}

static int pms_ioctl(struct inode *inode, struct file *file,
                 unsigned int cmd, unsigned long arg)
{
      return video_usercopy(inode, file, cmd, arg, pms_do_ioctl);
}

static ssize_t pms_read(struct file *file, char __user *buf,
                size_t count, loff_t *ppos)
{
      struct video_device *v = video_devdata(file);
      struct pms_device *pd=(struct pms_device *)v;
      int len;

      mutex_lock(&pd->lock);
      len=pms_capture(pd, buf, (pd->picture.depth==16)?0:1,count);
      mutex_unlock(&pd->lock);
      return len;
}

static const struct file_operations pms_fops = {
      .owner            = THIS_MODULE,
      .open           = video_exclusive_open,
      .release        = video_exclusive_release,
      .ioctl          = pms_ioctl,
      .compat_ioctl     = v4l_compat_ioctl32,
      .read           = pms_read,
      .llseek         = no_llseek,
};

static struct video_device pms_template=
{
      .owner            = THIS_MODULE,
      .name       = "Mediavision PMS",
      .type       = VID_TYPE_CAPTURE,
      .fops           = &pms_fops,
};

static struct pms_device pms_device;


/*
 *    Probe for and initialise the Mediavision PMS
 */

static int init_mediavision(void)
{
      int id;
      int idec, decst;
      int i;

      unsigned char i2c_defs[]={
            0x4C,0x30,0x00,0xE8,
            0xB6,0xE2,0x00,0x00,
            0xFF,0xFF,0x00,0x00,
            0x00,0x00,0x78,0x98,
            0x00,0x00,0x00,0x00,
            0x34,0x0A,0xF4,0xCE,
            0xE4
      };

      mem = ioremap(mem_base, 0x800);
      if (!mem)
            return -ENOMEM;

      if (!request_region(0x9A01, 1, "Mediavision PMS config"))
      {
            printk(KERN_WARNING "mediavision: unable to detect: 0x9A01 in use.\n");
            iounmap(mem);
            return -EBUSY;
      }
      if (!request_region(io_port, 3, "Mediavision PMS"))
      {
            printk(KERN_WARNING "mediavision: I/O port %d in use.\n", io_port);
            release_region(0x9A01, 1);
            iounmap(mem);
            return -EBUSY;
      }
      outb(0xB8, 0x9A01);           /* Unlock */
      outb(io_port>>4, 0x9A01);     /* Set IO port */


      id=mvv_read(3);
      decst=pms_i2c_stat(0x43);

      if(decst!=-1)
            idec=2;
      else if(pms_i2c_stat(0xb9)!=-1)
            idec=3;
      else if(pms_i2c_stat(0x8b)!=-1)
            idec=1;
      else
            idec=0;

      printk(KERN_INFO "PMS type is %d\n", idec);
      if(idec == 0) {
            release_region(io_port, 3);
            release_region(0x9A01, 1);
            iounmap(mem);
            return -ENODEV;
      }

      /*
       *    Ok we have a PMS of some sort
       */

      mvv_write(0x04, mem_base>>12);      /* Set the memory area */

      /* Ok now load the defaults */

      for(i=0;i<0x19;i++)
      {
            if(i2c_defs[i]==0xFF)
                  pms_i2c_andor(0x8A, i, 0x07,0x00);
            else
                  pms_i2c_write(0x8A, i, i2c_defs[i]);
      }

      pms_i2c_write(0xB8,0x00,0x12);
      pms_i2c_write(0xB8,0x04,0x00);
      pms_i2c_write(0xB8,0x07,0x00);
      pms_i2c_write(0xB8,0x08,0x00);
      pms_i2c_write(0xB8,0x09,0xFF);
      pms_i2c_write(0xB8,0x0A,0x00);
      pms_i2c_write(0xB8,0x0B,0x10);
      pms_i2c_write(0xB8,0x10,0x03);

      mvv_write(0x01, 0x00);
      mvv_write(0x05, 0xA0);
      mvv_write(0x08, 0x25);
      mvv_write(0x09, 0x00);
      mvv_write(0x0A, 0x20|MVVMEMORYWIDTH);

      mvv_write(0x10, 0x02);
      mvv_write(0x1E, 0x0C);
      mvv_write(0x1F, 0x03);
      mvv_write(0x26, 0x06);

      mvv_write(0x2B, 0x00);
      mvv_write(0x2C, 0x20);
      mvv_write(0x2D, 0x00);
      mvv_write(0x2F, 0x70);
      mvv_write(0x32, 0x00);
      mvv_write(0x33, MVVMEMORYWIDTH);
      mvv_write(0x34, 0x00);
      mvv_write(0x35, 0x00);
      mvv_write(0x3A, 0x80);
      mvv_write(0x3B, 0x10);
      mvv_write(0x20, 0x00);
      mvv_write(0x21, 0x00);
      mvv_write(0x30, 0x22);
      return 0;
}

/*
 *    Initialization and module stuff
 */

static int __init init_pms_cards(void)
{
      printk(KERN_INFO "Mediavision Pro Movie Studio driver 0.02\n");

      data_port = io_port +1;

      if(init_mediavision())
      {
            printk(KERN_INFO "Board not found.\n");
            return -ENODEV;
      }
      memcpy(&pms_device, &pms_template, sizeof(pms_template));
      mutex_init(&pms_device.lock);
      pms_device.height=240;
      pms_device.width=320;
      pms_swsense(75);
      pms_resolution(320,240);
      return video_register_device((struct video_device *)&pms_device, VFL_TYPE_GRABBER, video_nr);
}

module_param(io_port, int, 0);
module_param(mem_base, int, 0);
module_param(video_nr, int, 0);
MODULE_LICENSE("GPL");


static void __exit shutdown_mediavision(void)
{
      release_region(io_port,3);
      release_region(0x9A01, 1);
}

static void __exit cleanup_pms_module(void)
{
      shutdown_mediavision();
      video_unregister_device((struct video_device *)&pms_device);
      iounmap(mem);
}

module_init(init_pms_cards);
module_exit(cleanup_pms_module);


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