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saa5246a.c

/*
 * Driver for the SAA5246A or SAA5281 Teletext (=Videotext) decoder chips from
 * Philips.
 *
 * Only capturing of Teletext pages is tested. The videotext chips also have a
 * TV output but my hardware doesn't use it. For this reason this driver does
 * not support changing any TV display settings.
 *
 * Copyright (C) 2004 Michael Geng <linux@MichaelGeng.de>
 *
 * Derived from
 *
 * saa5249 driver
 * Copyright (C) 1998 Richard Guenther
 * <richard.guenther@student.uni-tuebingen.de>
 *
 * with changes by
 * Alan Cox <Alan.Cox@linux.org>
 *
 * and
 *
 * vtx.c
 * 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/mm.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/videotext.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/mutex.h>

#include "saa5246a.h"

MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver");
MODULE_LICENSE("GPL");

struct saa5246a_device
{
      u8     pgbuf[NUM_DAUS][VTX_VIRTUALSIZE];
      int    is_searching[NUM_DAUS];
      struct i2c_client *client;
      struct mutex lock;
};

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

/* Addresses to scan */
static unsigned short normal_i2c[]   = { I2C_ADDRESS, I2C_CLIENT_END };
I2C_CLIENT_INSMOD;

static struct i2c_client client_template;

static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind)
{
      int pgbuf;
      int err;
      struct i2c_client *client;
      struct video_device *vd;
      struct saa5246a_device *t;

      printk(KERN_INFO "saa5246a: 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 = video_device_alloc();
      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->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
            t->is_searching[pgbuf] = false;
      }
      vd->priv=t;


      /*
       *    Register it
       */

      if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
      {
            kfree(t);
            kfree(client);
            video_device_release(vd);
            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 saa5246a_probe(struct i2c_adapter *adap)
{
      if (adap->class & I2C_CLASS_TV_ANALOG)
            return i2c_probe(adap, &addr_data, saa5246a_attach);
      return 0;
}

static int saa5246a_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(client);
      return 0;
}

/*
 *    I2C interfaces
 */

static struct i2c_driver i2c_driver_videotext =
{
      .driver = {
            .name       = IF_NAME,        /* name */
      },
      .id         = I2C_DRIVERID_SAA5249, /* in i2c.h */
      .attach_adapter = saa5246a_probe,
      .detach_client  = saa5246a_detach,
};

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

static int i2c_sendbuf(struct saa5246a_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 saa5246a_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 saa5246a_device *t, int count, u8 *buf)
{
      if(i2c_master_recv(t->client, buf, count)!=count)
            return -1;
      return 0;
}

/* When a page is found then the not FOUND bit in one of the status registers
 * of the SAA5264A chip is cleared. Unfortunately this bit is not set
 * automatically when a new page is requested. Instead this function must be
 * called after a page has been requested.
 *
 * Return value: 0 if successful
 */
static int saa5246a_clear_found_bit(struct saa5246a_device *t,
      unsigned char dau_no)
{
      unsigned char row_25_column_8;

      if (i2c_senddata(t, SAA5246A_REGISTER_R8,

            dau_no |
            R8_DO_NOT_CLEAR_MEMORY,

            R9_CURSER_ROW_25,

            R10_CURSER_COLUMN_8,

            COMMAND_END) ||
            i2c_getdata(t, 1, &row_25_column_8))
      {
            return -EIO;
      }
      row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
      if (i2c_senddata(t, SAA5246A_REGISTER_R8,

            dau_no |
            R8_DO_NOT_CLEAR_MEMORY,

            R9_CURSER_ROW_25,

            R10_CURSER_COLUMN_8,

            row_25_column_8,

            COMMAND_END))
      {
            return -EIO;
      }

      return 0;
}

/* Requests one videotext page as described in req. The fields of req are
 * checked and an error is returned if something is invalid.
 *
 * Return value: 0 if successful
 */
static int saa5246a_request_page(struct saa5246a_device *t,
    vtx_pagereq_t *req)
{
      if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
            return -EINVAL;
      if (req->pagemask & PGMASK_PAGE)
            if (req->page < 0 || req->page > PAGE_MAX)
                  return -EINVAL;
      if (req->pagemask & PGMASK_HOUR)
            if (req->hour < 0 || req->hour > HOUR_MAX)
                  return -EINVAL;
      if (req->pagemask & PGMASK_MINUTE)
            if (req->minute < 0 || req->minute > MINUTE_MAX)
                  return -EINVAL;
      if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
            return -EINVAL;

      if (i2c_senddata(t, SAA5246A_REGISTER_R2,

            R2_IN_R3_SELECT_PAGE_HUNDREDS |
            req->pgbuf << 4 |
            R2_BANK_0 |
            R2_HAMMING_CHECK_OFF,

            HUNDREDS_OF_PAGE(req->page) |
            R3_HOLD_PAGE |
            (req->pagemask & PG_HUND ?
                  R3_PAGE_HUNDREDS_DO_CARE :
                  R3_PAGE_HUNDREDS_DO_NOT_CARE),

            TENS_OF_PAGE(req->page) |
            (req->pagemask & PG_TEN ?
                  R3_PAGE_TENS_DO_CARE :
                  R3_PAGE_TENS_DO_NOT_CARE),

            UNITS_OF_PAGE(req->page) |
            (req->pagemask & PG_UNIT ?
                  R3_PAGE_UNITS_DO_CARE :
                  R3_PAGE_UNITS_DO_NOT_CARE),

            TENS_OF_HOUR(req->hour) |
            (req->pagemask & HR_TEN ?
                  R3_HOURS_TENS_DO_CARE :
                  R3_HOURS_TENS_DO_NOT_CARE),

            UNITS_OF_HOUR(req->hour) |
            (req->pagemask & HR_UNIT ?
                  R3_HOURS_UNITS_DO_CARE :
                  R3_HOURS_UNITS_DO_NOT_CARE),

            TENS_OF_MINUTE(req->minute) |
            (req->pagemask & MIN_TEN ?
                  R3_MINUTES_TENS_DO_CARE :
                  R3_MINUTES_TENS_DO_NOT_CARE),

            UNITS_OF_MINUTE(req->minute) |
            (req->pagemask & MIN_UNIT ?
                  R3_MINUTES_UNITS_DO_CARE :
                  R3_MINUTES_UNITS_DO_NOT_CARE),

            COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,

            R2_IN_R3_SELECT_PAGE_HUNDREDS |
            req->pgbuf << 4 |
            R2_BANK_0 |
            R2_HAMMING_CHECK_OFF,

            HUNDREDS_OF_PAGE(req->page) |
            R3_UPDATE_PAGE |
            (req->pagemask & PG_HUND ?
                  R3_PAGE_HUNDREDS_DO_CARE :
                  R3_PAGE_HUNDREDS_DO_NOT_CARE),

            COMMAND_END))
      {
            return -EIO;
      }

      t->is_searching[req->pgbuf] = true;
      return 0;
}

/* This routine decodes the page number from the infobits contained in line 25.
 *
 * Parameters:
 * infobits: must be bits 0 to 9 of column 25
 *
 * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
 */
static inline int saa5246a_extract_pagenum_from_infobits(
    unsigned char infobits[10])
{
      int page_hundreds, page_tens, page_units;

      page_units    = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
      page_tens     = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
      page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;

      /* page 0x.. means page 8.. */
      if (page_hundreds == 0)
            page_hundreds = 8;

      return((page_hundreds << 8) | (page_tens << 4) | page_units);
}

/* Decodes the hour from the infobits contained in line 25.
 *
 * Parameters:
 * infobits: must be bits 0 to 9 of column 25
 *
 * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
 */
static inline int saa5246a_extract_hour_from_infobits(
    unsigned char infobits[10])
{
      int hour_tens, hour_units;

      hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
      hour_tens  = infobits[5] & ROW25_COLUMN5_HOUR_TENS;

      return((hour_tens << 4) | hour_units);
}

/* Decodes the minutes from the infobits contained in line 25.
 *
 * Parameters:
 * infobits: must be bits 0 to 9 of column 25
 *
 * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
 */
static inline int saa5246a_extract_minutes_from_infobits(
    unsigned char infobits[10])
{
      int minutes_tens, minutes_units;

      minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
      minutes_tens  = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;

      return((minutes_tens << 4) | minutes_units);
}

/* Reads the status bits contained in the first 10 columns of the first line
 * and extracts the information into info.
 *
 * Return value: 0 if successful
 */
static inline int saa5246a_get_status(struct saa5246a_device *t,
    vtx_pageinfo_t *info, unsigned char dau_no)
{
      unsigned char infobits[10];
      int column;

      if (dau_no >= NUM_DAUS)
            return -EINVAL;

      if (i2c_senddata(t, SAA5246A_REGISTER_R8,

            dau_no |
            R8_DO_NOT_CLEAR_MEMORY,

            R9_CURSER_ROW_25,

            R10_CURSER_COLUMN_0,

            COMMAND_END) ||
            i2c_getdata(t, 10, infobits))
      {
            return -EIO;
      }

      info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
      info->hour    = saa5246a_extract_hour_from_infobits(infobits);
      info->minute  = saa5246a_extract_minutes_from_infobits(infobits);
      info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
      info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
      info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
      info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
      info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
      info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
      info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
      info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
      info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
      info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
      info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
      info->hamming = 0;
      for (column = 0; column <= 7; column++) {
            if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
                  info->hamming = 1;
                  break;
            }
      }
      if (!info->hamming && !info->notfound)
            t->is_searching[dau_no] = false;
      return 0;
}

/* Reads 1 videotext page buffer of the SAA5246A.
 *
 * req is used both as input and as output. It contains information which part
 * must be read. The videotext page is copied into req->buffer.
 *
 * Return value: 0 if successful
 */
static inline int saa5246a_get_page(struct saa5246a_device *t,
      vtx_pagereq_t *req)
{
      int start, end, size;
      char *buf;
      int err;

      if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
          req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
            return -EINVAL;

      buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
      if (!buf)
            return -ENOMEM;

      /* Read "normal" part of page */
      err = -EIO;

      end = min(req->end, VTX_PAGESIZE - 1);
      if (i2c_senddata(t, SAA5246A_REGISTER_R8,
                  req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
                  ROW(req->start), COLUMN(req->start), COMMAND_END))
            goto out;
      if (i2c_getdata(t, end - req->start + 1, buf))
            goto out;
      err = -EFAULT;
      if (copy_to_user(req->buffer, buf, end - req->start + 1))
            goto out;

      /* Always get the time from buffer 4, since this stupid SAA5246A only
       * updates the currently displayed buffer...
       */
      if (REQ_CONTAINS_TIME(req)) {
            start = max(req->start, POS_TIME_START);
            end   = min(req->end,   POS_TIME_END);
            size = end - start + 1;
            err = -EINVAL;
            if (size < 0)
                  goto out;
            err = -EIO;
            if (i2c_senddata(t, SAA5246A_REGISTER_R8,
                        R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
                        R9_CURSER_ROW_0, start, COMMAND_END))
                  goto out;
            if (i2c_getdata(t, size, buf))
                  goto out;
            err = -EFAULT;
            if (copy_to_user(req->buffer + start - req->start, buf, size))
                  goto out;
      }
      /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
      if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
            start = max(req->start, POS_HEADER_START);
            end   = min(req->end,   POS_HEADER_END);
            size = end - start + 1;
            err = -EINVAL;
            if (size < 0)
                  goto out;
            err = -EIO;
            if (i2c_senddata(t, SAA5246A_REGISTER_R8,
                        R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
                        R9_CURSER_ROW_0, start, COMMAND_END))
                  goto out;
            if (i2c_getdata(t, end - start + 1, buf))
                  goto out;
            err = -EFAULT;
            if (copy_to_user(req->buffer + start - req->start, buf, size))
                  goto out;
      }
      err = 0;
out:
      kfree(buf);
      return err;
}

/* Stops the acquisition circuit given in dau_no. The page buffer associated
 * with this acquisition circuit will no more be updated. The other daus are
 * not affected.
 *
 * Return value: 0 if successful
 */
static inline int saa5246a_stop_dau(struct saa5246a_device *t,
    unsigned char dau_no)
{
      if (dau_no >= NUM_DAUS)
            return -EINVAL;
      if (i2c_senddata(t, SAA5246A_REGISTER_R2,

            R2_IN_R3_SELECT_PAGE_HUNDREDS |
            dau_no << 4 |
            R2_BANK_0 |
            R2_HAMMING_CHECK_OFF,

            R3_PAGE_HUNDREDS_0 |
            R3_HOLD_PAGE |
            R3_PAGE_HUNDREDS_DO_NOT_CARE,

            COMMAND_END))
      {
            return -EIO;
      }
      t->is_searching[dau_no] = false;
      return 0;
}

/*  Handles ioctls defined in videotext.h
 *
 *  Returns 0 if successful
 */
static int do_saa5246a_ioctl(struct inode *inode, struct file *file,
                      unsigned int cmd, void *arg)
{
      struct video_device *vd = video_devdata(file);
      struct saa5246a_device *t=vd->priv;
      switch(cmd)
      {
            case VTXIOCGETINFO:
            {
                  vtx_info_t *info = arg;

                  info->version_major = MAJOR_VERSION;
                  info->version_minor = MINOR_VERSION;
                  info->numpages = NUM_DAUS;
                  return 0;
            }

            case VTXIOCCLRPAGE:
            {
                  vtx_pagereq_t *req = arg;

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

            case VTXIOCCLRFOUND:
            {
                  vtx_pagereq_t *req = arg;

                  if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
                        return -EINVAL;
                  return(saa5246a_clear_found_bit(t, req->pgbuf));
            }

            case VTXIOCPAGEREQ:
            {
                  vtx_pagereq_t *req = arg;

                  return(saa5246a_request_page(t, req));
            }

            case VTXIOCGETSTAT:
            {
                  vtx_pagereq_t *req = arg;
                  vtx_pageinfo_t info;
                  int rval;

                  if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
                        return rval;
                  if(copy_to_user(req->buffer, &info,
                        sizeof(vtx_pageinfo_t)))
                        return -EFAULT;
                  return 0;
            }

            case VTXIOCGETPAGE:
            {
                  vtx_pagereq_t *req = arg;

                  return(saa5246a_get_page(t, req));
            }

            case VTXIOCSTOPDAU:
            {
                  vtx_pagereq_t *req = arg;

                  return(saa5246a_stop_dau(t, req->pgbuf));
            }

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

            case VTXIOCCLRCACHE:
            {
                  return 0;
            }

            case VTXIOCSETVIRT:
            {
                  /* I do not know what "virtual mode" means */
                  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 saa5246a_ioctl(struct inode *inode, struct file *file,
                   unsigned int cmd, unsigned long arg)
{
      struct video_device *vd = video_devdata(file);
      struct saa5246a_device *t = vd->priv;
      int err;

      cmd = vtx_fix_command(cmd);
      mutex_lock(&t->lock);
      err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
      mutex_unlock(&t->lock);
      return err;
}

static int saa5246a_open(struct inode *inode, struct file *file)
{
      struct video_device *vd = video_devdata(file);
      struct saa5246a_device *t = vd->priv;
      int err;

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

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

      if (i2c_senddata(t, SAA5246A_REGISTER_R0,

            R0_SELECT_R11 |
            R0_PLL_TIME_CONSTANT_LONG |
            R0_ENABLE_nODD_EVEN_OUTPUT |
            R0_ENABLE_HDR_POLL |
            R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
            R0_NO_FREE_RUN_PLL |
            R0_NO_AUTOMATIC_FASTEXT_PROMPT,

            R1_NON_INTERLACED_312_312_LINES |
            R1_DEW |
            R1_EXTENDED_PACKET_DISABLE |
            R1_DAUS_ALL_ON |
            R1_8_BITS_NO_PARITY |
            R1_VCS_TO_SCS,

            COMMAND_END) ||
            i2c_senddata(t, SAA5246A_REGISTER_R4,

            /* We do not care much for the TV display but nevertheless we
             * need the currently displayed page later because only on that
             * page the time is updated. */
            R4_DISPLAY_PAGE_4,

            COMMAND_END))
      {
            err = -EIO;
            goto fail;
      }

      return 0;

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

static int saa5246a_release(struct inode *inode, struct file *file)
{
      struct video_device *vd = video_devdata(file);
      struct saa5246a_device *t = vd->priv;

      /* Stop all acquisition circuits. */
      i2c_senddata(t, SAA5246A_REGISTER_R1,

            R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
            R1_DEW |
            R1_EXTENDED_PACKET_DISABLE |
            R1_DAUS_ALL_OFF |
            R1_8_BITS_NO_PARITY |
            R1_VCS_TO_SCS,

            COMMAND_END);
      video_exclusive_release(inode,file);
      return 0;
}

static int __init init_saa_5246a (void)
{
      printk(KERN_INFO
            "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
            MAJOR_VERSION, MINOR_VERSION);
      return i2c_add_driver(&i2c_driver_videotext);
}

static void __exit cleanup_saa_5246a (void)
{
      i2c_del_driver(&i2c_driver_videotext);
}

module_init(init_saa_5246a);
module_exit(cleanup_saa_5246a);

static const struct file_operations saa_fops = {
      .owner       = THIS_MODULE,
      .open  = saa5246a_open,
      .release = saa5246a_release,
      .ioctl       = saa5246a_ioctl,
      .llseek      = no_llseek,
};

static struct video_device saa_template =
{
      .owner        = THIS_MODULE,
      .name   = IF_NAME,
      .type   = VID_TYPE_TELETEXT,
      .fops   = &saa_fops,
      .release  = video_device_release,
      .minor    = -1,
};

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