/*
 * 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 <media/v4l2-ioctl.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                /* I²C 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,
#ifdef CONFIG_COMPAT
        .compat_ioctl   = v4l_compat_ioctl32,
#endif
        .llseek         = no_llseek,
};

static struct video_device saa_template =
{
        .name           = IF_NAME,
        .fops           = &saa_fops,
};

MODULE_LICENSE("GPL");