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saa5249.c

/*
 * Modified in order to keep it compatible both with new and old videotext IOCTLs by
 * Michael Geng <linux@MichaelGeng.de>
 *
 *    Cleaned up to use existing videodev interface and allow the idea
 *    of multiple teletext decoders on the video4linux iface. Changed i2c
 *    to cover addressing clashes on device busses. It's also rebuilt so
 *    you can add arbitary multiple teletext devices to Linux video4linux
 *    now (well 32 anyway).
 *
 *    Alan Cox <Alan.Cox@linux.org>
 *
 *    The original driver was heavily modified to match the i2c interface
 *    It was truncated to use the WinTV boards, too.
 *
 *    Copyright (c) 1998 Richard Guenther <richard.guenther@student.uni-tuebingen.de>
 *
 * $Id: saa5249.c,v 1.1 1998/03/30 22:23:23 alan Exp $
 *
 *    Derived From
 *
 * vtx.c:
 * This is a loadable character-device-driver for videotext-interfaces
 * (aka teletext). Please check the Makefile/README for a list of supported
 * interfaces.
 *
 * Copyright (c) 1994-97 Martin Buck  <martin-2.buck@student.uni-ulm.de>
 *
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <stdarg.h>
#include <linux/i2c.h>
#include <linux/videotext.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/mutex.h>


#include <asm/io.h>
#include <asm/uaccess.h>

#define VTX_VER_MAJ 1
#define VTX_VER_MIN 8



#define NUM_DAUS 4
#define NUM_BUFS 8
#define IF_NAME "SAA5249"

static const int disp_modes[8][3] =
{
      { 0x46, 0x03, 0x03 },   /* DISPOFF */
      { 0x46, 0xcc, 0xcc },   /* DISPNORM */
      { 0x44, 0x0f, 0x0f },   /* DISPTRANS */
      { 0x46, 0xcc, 0x46 },   /* DISPINS */
      { 0x44, 0x03, 0x03 },   /* DISPOFF, interlaced */
      { 0x44, 0xcc, 0xcc },   /* DISPNORM, interlaced */
      { 0x44, 0x0f, 0x0f },   /* DISPTRANS, interlaced */
      { 0x44, 0xcc, 0x46 }    /* DISPINS, interlaced */
};



#define PAGE_WAIT    msecs_to_jiffies(300)      /* Time between requesting page and */
                                    /* checking status bits */
#define PGBUF_EXPIRE msecs_to_jiffies(15000)    /* Time to wait before retransmitting */
                                    /* page regardless of infobits */
typedef struct {
      u8 pgbuf[VTX_VIRTUALSIZE];          /* Page-buffer */
      u8 laststat[10];              /* Last value of infobits for DAU */
      u8 sregs[7];                        /* Page-request registers */
      unsigned long expire;               /* Time when page will be expired */
      unsigned clrfound : 1;              /* VTXIOCCLRFOUND has been called */
      unsigned stopped : 1;               /* VTXIOCSTOPDAU has been called */
} vdau_t;

struct saa5249_device
{
      vdau_t vdau[NUM_DAUS];              /* Data for virtual DAUs (the 5249 only has one */
                                    /* real DAU, so we have to simulate some more) */
      int vtx_use_count;
      int is_searching[NUM_DAUS];
      int disp_mode;
      int virtual_mode;
      struct i2c_client *client;
      struct mutex lock;
};


#define CCTWR 34        /* IC write/read-address of vtx-chip */
#define CCTRD 35
#define NOACK_REPEAT 10       /* Retry access this many times on failure */
#define CLEAR_DELAY   msecs_to_jiffies(50)      /* Time required to clear a page */
#define READY_TIMEOUT msecs_to_jiffies(30)      /* Time to wait for ready signal of I2C-bus interface */
#define INIT_DELAY 500        /* Time in usec to wait at initialization of CEA interface */
#define START_DELAY 10        /* Time in usec to wait before starting write-cycle (CEA) */

#define VTX_DEV_MINOR 0

/* General defines and debugging support */

#define RESCHED do { cond_resched(); } while(0)

static struct video_device saa_template;  /* Declared near bottom */

/* Addresses to scan */
static unsigned short normal_i2c[] = {34>>1,I2C_CLIENT_END};
I2C_CLIENT_INSMOD;

static struct i2c_client client_template;

static int saa5249_attach(struct i2c_adapter *adap, int addr, int kind)
{
      int pgbuf;
      int err;
      struct i2c_client *client;
      struct video_device *vd;
      struct saa5249_device *t;

      printk(KERN_INFO "saa5249: teletext chip found.\n");
      client=kmalloc(sizeof(*client), GFP_KERNEL);
      if(client==NULL)
            return -ENOMEM;
      client_template.adapter = adap;
      client_template.addr = addr;
      memcpy(client, &client_template, sizeof(*client));
      t = kzalloc(sizeof(*t), GFP_KERNEL);
      if(t==NULL)
      {
            kfree(client);
            return -ENOMEM;
      }
      strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
      mutex_init(&t->lock);

      /*
       *    Now create a video4linux device
       */

      vd = kmalloc(sizeof(struct video_device), GFP_KERNEL);
      if(vd==NULL)
      {
            kfree(t);
            kfree(client);
            return -ENOMEM;
      }
      i2c_set_clientdata(client, vd);
      memcpy(vd, &saa_template, sizeof(*vd));

      for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
      {
            memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
            memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
            memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
            t->vdau[pgbuf].expire = 0;
            t->vdau[pgbuf].clrfound = true;
            t->vdau[pgbuf].stopped = true;
            t->is_searching[pgbuf] = false;
      }
      vd->priv=t;


      /*
       *    Register it
       */

      if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
      {
            kfree(t);
            kfree(vd);
            kfree(client);
            return err;
      }
      t->client = client;
      i2c_attach_client(client);
      return 0;
}

/*
 *    We do most of the hard work when we become a device on the i2c.
 */

static int saa5249_probe(struct i2c_adapter *adap)
{
      if (adap->class & I2C_CLASS_TV_ANALOG)
            return i2c_probe(adap, &addr_data, saa5249_attach);
      return 0;
}

static int saa5249_detach(struct i2c_client *client)
{
      struct video_device *vd = i2c_get_clientdata(client);
      i2c_detach_client(client);
      video_unregister_device(vd);
      kfree(vd->priv);
      kfree(vd);
      kfree(client);
      return 0;
}

/* new I2C driver support */

static struct i2c_driver i2c_driver_videotext =
{
      .driver = {
            .name       = IF_NAME,        /* name */
      },
      .id         = I2C_DRIVERID_SAA5249, /* in i2c.h */
      .attach_adapter = saa5249_probe,
      .detach_client  = saa5249_detach,
};

static struct i2c_client client_template = {
      .driver           = &i2c_driver_videotext,
      .name       = "(unset)",
};

/*
 *    Wait the given number of jiffies (10ms). This calls the scheduler, so the actual
 *    delay may be longer.
 */

static void jdelay(unsigned long delay)
{
      sigset_t oldblocked = current->blocked;

      spin_lock_irq(&current->sighand->siglock);
      sigfillset(&current->blocked);
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);
      msleep_interruptible(jiffies_to_msecs(delay));

      spin_lock_irq(&current->sighand->siglock);
      current->blocked = oldblocked;
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);
}


/*
 *    I2C interfaces
 */

static int i2c_sendbuf(struct saa5249_device *t, int reg, int count, u8 *data)
{
      char buf[64];

      buf[0] = reg;
      memcpy(buf+1, data, count);

      if(i2c_master_send(t->client, buf, count+1)==count+1)
            return 0;
      return -1;
}

static int i2c_senddata(struct saa5249_device *t, ...)
{
      unsigned char buf[64];
      int v;
      int ct = 0;
      va_list argp;
      va_start(argp,t);

      while ((v = va_arg(argp, int)) != -1)
            buf[ct++] = v;

      va_end(argp);
      return i2c_sendbuf(t, buf[0], ct-1, buf+1);
}

/* Get count number of bytes from I²C-device at address adr, store them in buf. Start & stop
 * handshaking is done by this routine, ack will be sent after the last byte to inhibit further
 * sending of data. If uaccess is 'true', data is written to user-space with put_user.
 * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise
 */

static int i2c_getdata(struct saa5249_device *t, int count, u8 *buf)
{
      if(i2c_master_recv(t->client, buf, count)!=count)
            return -1;
      return 0;
}


/*
 *    Standard character-device-driver functions
 */

static int do_saa5249_ioctl(struct inode *inode, struct file *file,
                      unsigned int cmd, void *arg)
{
      static int virtual_mode = false;
      struct video_device *vd = video_devdata(file);
      struct saa5249_device *t=vd->priv;

      switch(cmd)
      {
            case VTXIOCGETINFO:
            {
                  vtx_info_t *info = arg;
                  info->version_major = VTX_VER_MAJ;
                  info->version_minor = VTX_VER_MIN;
                  info->numpages = NUM_DAUS;
                  /*info->cct_type = CCT_TYPE;*/
                  return 0;
            }

            case VTXIOCCLRPAGE:
            {
                  vtx_pagereq_t *req = arg;

                  if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
                        return -EINVAL;
                  memset(t->vdau[req->pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
                  t->vdau[req->pgbuf].clrfound = true;
                  return 0;
            }

            case VTXIOCCLRFOUND:
            {
                  vtx_pagereq_t *req = arg;

                  if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
                        return -EINVAL;
                  t->vdau[req->pgbuf].clrfound = true;
                  return 0;
            }

            case VTXIOCPAGEREQ:
            {
                  vtx_pagereq_t *req = arg;
                  if (!(req->pagemask & PGMASK_PAGE))
                        req->page = 0;
                  if (!(req->pagemask & PGMASK_HOUR))
                        req->hour = 0;
                  if (!(req->pagemask & PGMASK_MINUTE))
                        req->minute = 0;
                  if (req->page < 0 || req->page > 0x8ff) /* 7FF ?? */
                        return -EINVAL;
                  req->page &= 0x7ff;
                  if (req->hour < 0 || req->hour > 0x3f || req->minute < 0 || req->minute > 0x7f ||
                        req->pagemask < 0 || req->pagemask >= PGMASK_MAX || req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
                        return -EINVAL;
                  t->vdau[req->pgbuf].sregs[0] = (req->pagemask & PG_HUND ? 0x10 : 0) | (req->page / 0x100);
                  t->vdau[req->pgbuf].sregs[1] = (req->pagemask & PG_TEN ? 0x10 : 0) | ((req->page / 0x10) & 0xf);
                  t->vdau[req->pgbuf].sregs[2] = (req->pagemask & PG_UNIT ? 0x10 : 0) | (req->page & 0xf);
                  t->vdau[req->pgbuf].sregs[3] = (req->pagemask & HR_TEN ? 0x10 : 0) | (req->hour / 0x10);
                  t->vdau[req->pgbuf].sregs[4] = (req->pagemask & HR_UNIT ? 0x10 : 0) | (req->hour & 0xf);
                  t->vdau[req->pgbuf].sregs[5] = (req->pagemask & MIN_TEN ? 0x10 : 0) | (req->minute / 0x10);
                  t->vdau[req->pgbuf].sregs[6] = (req->pagemask & MIN_UNIT ? 0x10 : 0) | (req->minute & 0xf);
                  t->vdau[req->pgbuf].stopped = false;
                  t->vdau[req->pgbuf].clrfound = true;
                  t->is_searching[req->pgbuf] = true;
                  return 0;
            }

            case VTXIOCGETSTAT:
            {
                  vtx_pagereq_t *req = arg;
                  u8 infobits[10];
                  vtx_pageinfo_t info;
                  int a;

                  if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
                        return -EINVAL;
                  if (!t->vdau[req->pgbuf].stopped)
                  {
                        if (i2c_senddata(t, 2, 0, -1) ||
                              i2c_sendbuf(t, 3, sizeof(t->vdau[0].sregs), t->vdau[req->pgbuf].sregs) ||
                              i2c_senddata(t, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) ||
                              i2c_senddata(t, 2, 0, t->vdau[req->pgbuf].sregs[0] | 8, -1) ||
                              i2c_senddata(t, 8, 0, 25, 0, -1))
                              return -EIO;
                        jdelay(PAGE_WAIT);
                        if (i2c_getdata(t, 10, infobits))
                              return -EIO;

                        if (!(infobits[8] & 0x10) && !(infobits[7] & 0xf0) && /* check FOUND-bit */
                              (memcmp(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits)) ||
                              time_after_eq(jiffies, t->vdau[req->pgbuf].expire)))
                        {           /* check if new page arrived */
                              if (i2c_senddata(t, 8, 0, 0, 0, -1) ||
                                    i2c_getdata(t, VTX_PAGESIZE, t->vdau[req->pgbuf].pgbuf))
                                    return -EIO;
                              t->vdau[req->pgbuf].expire = jiffies + PGBUF_EXPIRE;
                              memset(t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE, ' ', VTX_VIRTUALSIZE - VTX_PAGESIZE);
                              if (t->virtual_mode)
                              {
                                    /* Packet X/24 */
                                    if (i2c_senddata(t, 8, 0, 0x20, 0, -1) ||
                                          i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40))
                                          return -EIO;
                                    /* Packet X/27/0 */
                                    if (i2c_senddata(t, 8, 0, 0x21, 0, -1) ||
                                          i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40))
                                          return -EIO;
                                    /* Packet 8/30/0...8/30/15
                                     * FIXME: AFAIK, the 5249 does hamming-decoding for some bytes in packet 8/30,
                                     *        so we should undo this here.
                                     */
                                    if (i2c_senddata(t, 8, 0, 0x22, 0, -1) ||
                                          i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40))
                                          return -EIO;
                              }
                              t->vdau[req->pgbuf].clrfound = false;
                              memcpy(t->vdau[req->pgbuf].laststat, infobits, sizeof(infobits));
                        }
                        else
                        {
                              memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
                        }
                  }
                  else
                  {
                        memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
                  }

                  info.pagenum = ((infobits[8] << 8) & 0x700) | ((infobits[1] << 4) & 0xf0) | (infobits[0] & 0x0f);
                  if (info.pagenum < 0x100)
                        info.pagenum += 0x800;
                  info.hour = ((infobits[5] << 4) & 0x30) | (infobits[4] & 0x0f);
                  info.minute = ((infobits[3] << 4) & 0x70) | (infobits[2] & 0x0f);
                  info.charset = ((infobits[7] >> 1) & 7);
                  info.delete = !!(infobits[3] & 8);
                  info.headline = !!(infobits[5] & 4);
                  info.subtitle = !!(infobits[5] & 8);
                  info.supp_header = !!(infobits[6] & 1);
                  info.update = !!(infobits[6] & 2);
                  info.inter_seq = !!(infobits[6] & 4);
                  info.dis_disp = !!(infobits[6] & 8);
                  info.serial = !!(infobits[7] & 1);
                  info.notfound = !!(infobits[8] & 0x10);
                  info.pblf = !!(infobits[9] & 0x20);
                  info.hamming = 0;
                  for (a = 0; a <= 7; a++)
                  {
                        if (infobits[a] & 0xf0)
                        {
                              info.hamming = 1;
                              break;
                        }
                  }
                  if (t->vdau[req->pgbuf].clrfound)
                        info.notfound = 1;
                  if(copy_to_user(req->buffer, &info, sizeof(vtx_pageinfo_t)))
                        return -EFAULT;
                  if (!info.hamming && !info.notfound)
                  {
                        t->is_searching[req->pgbuf] = false;
                  }
                  return 0;
            }

            case VTXIOCGETPAGE:
            {
                  vtx_pagereq_t *req = arg;
                  int start, end;

                  if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || req->start < 0 ||
                        req->start > req->end || req->end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE))
                        return -EINVAL;
                  if(copy_to_user(req->buffer, &t->vdau[req->pgbuf].pgbuf[req->start], req->end - req->start + 1))
                        return -EFAULT;

                   /*
                    *   Always read the time directly from SAA5249
                    */

                  if (req->start <= 39 && req->end >= 32)
                  {
                        int len;
                        char buf[16];
                        start = max(req->start, 32);
                        end = min(req->end, 39);
                        len=end-start+1;
                        if (i2c_senddata(t, 8, 0, 0, start, -1) ||
                              i2c_getdata(t, len, buf))
                              return -EIO;
                        if(copy_to_user(req->buffer+start-req->start, buf, len))
                              return -EFAULT;
                  }
                  /* Insert the current header if DAU is still searching for a page */
                  if (req->start <= 31 && req->end >= 7 && t->is_searching[req->pgbuf])
                  {
                        char buf[32];
                        int len;
                        start = max(req->start, 7);
                        end = min(req->end, 31);
                        len=end-start+1;
                        if (i2c_senddata(t, 8, 0, 0, start, -1) ||
                              i2c_getdata(t, len, buf))
                              return -EIO;
                        if(copy_to_user(req->buffer+start-req->start, buf, len))
                              return -EFAULT;
                  }
                  return 0;
            }

            case VTXIOCSTOPDAU:
            {
                  vtx_pagereq_t *req = arg;

                  if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
                        return -EINVAL;
                  t->vdau[req->pgbuf].stopped = true;
                  t->is_searching[req->pgbuf] = false;
                  return 0;
            }

            case VTXIOCPUTPAGE:
            case VTXIOCSETDISP:
            case VTXIOCPUTSTAT:
                  return 0;

            case VTXIOCCLRCACHE:
            {
                  if (i2c_senddata(t, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, 11,
                        ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
                        ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', -1))
                        return -EIO;
                  if (i2c_senddata(t, 3, 0x20, -1))
                        return -EIO;
                  jdelay(10 * CLEAR_DELAY);                 /* I have no idea how long we have to wait here */
                  return 0;
            }

            case VTXIOCSETVIRT:
            {
                  /* The SAA5249 has virtual-row reception turned on always */
                  t->virtual_mode = (int)(long)arg;
                  return 0;
            }
      }
      return -EINVAL;
}

/*
 * Translates old vtx IOCTLs to new ones
 *
 * This keeps new kernel versions compatible with old userspace programs.
 */
static inline unsigned int vtx_fix_command(unsigned int cmd)
{
      switch (cmd) {
      case VTXIOCGETINFO_OLD:
            cmd = VTXIOCGETINFO;
            break;
      case VTXIOCCLRPAGE_OLD:
            cmd = VTXIOCCLRPAGE;
            break;
      case VTXIOCCLRFOUND_OLD:
            cmd = VTXIOCCLRFOUND;
            break;
      case VTXIOCPAGEREQ_OLD:
            cmd = VTXIOCPAGEREQ;
            break;
      case VTXIOCGETSTAT_OLD:
            cmd = VTXIOCGETSTAT;
            break;
      case VTXIOCGETPAGE_OLD:
            cmd = VTXIOCGETPAGE;
            break;
      case VTXIOCSTOPDAU_OLD:
            cmd = VTXIOCSTOPDAU;
            break;
      case VTXIOCPUTPAGE_OLD:
            cmd = VTXIOCPUTPAGE;
            break;
      case VTXIOCSETDISP_OLD:
            cmd = VTXIOCSETDISP;
            break;
      case VTXIOCPUTSTAT_OLD:
            cmd = VTXIOCPUTSTAT;
            break;
      case VTXIOCCLRCACHE_OLD:
            cmd = VTXIOCCLRCACHE;
            break;
      case VTXIOCSETVIRT_OLD:
            cmd = VTXIOCSETVIRT;
            break;
      }
      return cmd;
}

/*
 *    Handle the locking
 */

static int saa5249_ioctl(struct inode *inode, struct file *file,
                   unsigned int cmd, unsigned long arg)
{
      struct video_device *vd = video_devdata(file);
      struct saa5249_device *t=vd->priv;
      int err;

      cmd = vtx_fix_command(cmd);
      mutex_lock(&t->lock);
      err = video_usercopy(inode,file,cmd,arg,do_saa5249_ioctl);
      mutex_unlock(&t->lock);
      return err;
}

static int saa5249_open(struct inode *inode, struct file *file)
{
      struct video_device *vd = video_devdata(file);
      struct saa5249_device *t=vd->priv;
      int err,pgbuf;

      err = video_exclusive_open(inode,file);
      if (err < 0)
            return err;

      if (t->client==NULL) {
            err = -ENODEV;
            goto fail;
      }

      if (i2c_senddata(t, 0, 0, -1) ||          /* Select R11 */
                                    /* Turn off parity checks (we do this ourselves) */
            i2c_senddata(t, 1, disp_modes[t->disp_mode][0], 0, -1) ||
                                    /* Display TV-picture, no virtual rows */
            i2c_senddata(t, 4, NUM_DAUS, disp_modes[t->disp_mode][1], disp_modes[t->disp_mode][2], 7, -1)) /* Set display to page 4 */

      {
            err = -EIO;
            goto fail;
      }

      for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
      {
            memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
            memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
            memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
            t->vdau[pgbuf].expire = 0;
            t->vdau[pgbuf].clrfound = true;
            t->vdau[pgbuf].stopped = true;
            t->is_searching[pgbuf] = false;
      }
      t->virtual_mode = false;
      return 0;

 fail:
      video_exclusive_release(inode,file);
      return err;
}



static int saa5249_release(struct inode *inode, struct file *file)
{
      struct video_device *vd = video_devdata(file);
      struct saa5249_device *t=vd->priv;
      i2c_senddata(t, 1, 0x20, -1);       /* Turn off CCT */
      i2c_senddata(t, 5, 3, 3, -1);       /* Turn off TV-display */
      video_exclusive_release(inode,file);
      return 0;
}

static int __init init_saa_5249 (void)
{
      printk(KERN_INFO "SAA5249 driver (" IF_NAME " interface) for VideoText version %d.%d\n",
                  VTX_VER_MAJ, VTX_VER_MIN);
      return i2c_add_driver(&i2c_driver_videotext);
}

static void __exit cleanup_saa_5249 (void)
{
      i2c_del_driver(&i2c_driver_videotext);
}

module_init(init_saa_5249);
module_exit(cleanup_saa_5249);

static const struct file_operations saa_fops = {
      .owner            = THIS_MODULE,
      .open       = saa5249_open,
      .release          = saa5249_release,
      .ioctl          = saa5249_ioctl,
      .compat_ioctl     = v4l_compat_ioctl32,
      .llseek         = no_llseek,
};

static struct video_device saa_template =
{
      .owner            = THIS_MODULE,
      .name       = IF_NAME,
      .type       = VID_TYPE_TELETEXT,    /*| VID_TYPE_TUNER ?? */
      .fops           = &saa_fops,
};

MODULE_LICENSE("GPL");

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