drivers/media/video/saa5249.c - kernel/msm-5.4 - Gitiles

 /*
  * 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>
  *
  *	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/mm.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
 #include <linux/smp_lock.h>
 #include <linux/mutex.h>
 #include <linux/delay.h>
 #include <linux/videotext.h>
 #include <linux/videodev.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.h>
 #include <media/v4l2-i2c-drv-legacy.h>

 MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
 MODULE_DESCRIPTION("Philips SAA5249 Teletext decoder driver");
 MODULE_LICENSE("GPL");

 #define VTX_VER_MAJ 1
 #define VTX_VER_MIN 8


 #define NUM_DAUS 4
 #define NUM_BUFS 8

 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;
 	unsigned long in_use;
 	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

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

 /*
  *	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 IÂ²C-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 IÂ²C-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 saa5249_device *t = video_drvdata(file);

 	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 saa5249_device *t = video_drvdata(file);
 	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 saa5249_device *t = video_drvdata(file);
 	int pgbuf;

 	if (t->client == NULL)
 		return -ENODEV;

 	if (test_and_set_bit(0, &t->in_use))
 		return -EBUSY;

 	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 */
 	{
 		clear_bit(0, &t->in_use);
 		return -EIO;
 	}

 	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;
 }


 static int saa5249_release(struct inode *inode, struct file *file)
 {
 	struct saa5249_device *t = video_drvdata(file);

 	i2c_senddata(t, 1, 0x20, -1);		/* Turn off CCT */
 	i2c_senddata(t, 5, 3, 3, -1);		/* Turn off TV-display */
 	clear_bit(0, &t->in_use);
 	return 0;
 }

 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		= "saa5249",
 	.fops           = &saa_fops,
 	.release 	= video_device_release,
 };

 /* Addresses to scan */
 static unsigned short normal_i2c[] = { 0x22 >> 1, I2C_CLIENT_END };

 I2C_CLIENT_INSMOD;

 static int saa5249_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	int pgbuf;
 	int err;
 	struct video_device *vd;
 	struct saa5249_device *t;

 	v4l_info(client, "chip found @ 0x%x (%s)\n",
 			client->addr << 1, client->adapter->name);
 	v4l_info(client, "VideoText version %d.%d\n",
 			VTX_VER_MAJ, VTX_VER_MIN);
 	t = kzalloc(sizeof(*t), GFP_KERNEL);
 	if (t == NULL)
 		return -ENOMEM;
 	mutex_init(&t->lock);

 	/* Now create a video4linux device */
 	vd = kmalloc(sizeof(struct video_device), GFP_KERNEL);
 	if (vd == NULL) {
 		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;
 	}
 	video_set_drvdata(vd, t);

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

 static int saa5249_remove(struct i2c_client *client)
 {
 	struct video_device *vd = i2c_get_clientdata(client);

 	video_unregister_device(vd);
 	kfree(video_get_drvdata(vd));
 	kfree(vd);
 	return 0;
 }

 static const struct i2c_device_id saa5249_id[] = {
 	{ "saa5249", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, saa5249_id);

 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 	.name = "saa5249",
 	.driverid = I2C_DRIVERID_SAA5249,
 	.probe = saa5249_probe,
 	.remove = saa5249_remove,
 	.id_table = saa5249_id,
 };
	/*
	* 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>
	*
	* 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/mm.h>
	#include <linux/init.h>
	#include <linux/i2c.h>
	#include <linux/smp_lock.h>
	#include <linux/mutex.h>
	#include <linux/delay.h>
	#include <linux/videotext.h>
	#include <linux/videodev.h>
	#include <media/v4l2-common.h>
	#include <media/v4l2-ioctl.h>
	#include <media/v4l2-i2c-drv-legacy.h>

	MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
	MODULE_DESCRIPTION("Philips SAA5249 Teletext decoder driver");
	MODULE_LICENSE("GPL");

	#define VTX_VER_MAJ 1
	#define VTX_VER_MIN 8


	#define NUM_DAUS 4
	#define NUM_BUFS 8

	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;
	unsigned long in_use;
	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

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

	/*
	* 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 IÂ²C-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 IÂ²C-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 saa5249_device *t = video_drvdata(file);

	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 saa5249_device *t = video_drvdata(file);
	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 saa5249_device *t = video_drvdata(file);
	int pgbuf;

	if (t->client == NULL)
	return -ENODEV;

	if (test_and_set_bit(0, &t->in_use))
	return -EBUSY;

	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 */
	{
	clear_bit(0, &t->in_use);
	return -EIO;
	}

	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;
	}



	static int saa5249_release(struct inode inode, struct file file)
	{
	struct saa5249_device *t = video_drvdata(file);

	i2c_senddata(t, 1, 0x20, -1); /* Turn off CCT */
	i2c_senddata(t, 5, 3, 3, -1); /* Turn off TV-display */
	clear_bit(0, &t->in_use);
	return 0;
	}

	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 = "saa5249",
	.fops = &saa_fops,
	.release = video_device_release,
	};

	/* Addresses to scan */
	static unsigned short normal_i2c[] = { 0x22 >> 1, I2C_CLIENT_END };

	I2C_CLIENT_INSMOD;

	static int saa5249_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	int pgbuf;
	int err;
	struct video_device *vd;
	struct saa5249_device *t;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
	client->addr << 1, client->adapter->name);
	v4l_info(client, "VideoText version %d.%d\n",
	VTX_VER_MAJ, VTX_VER_MIN);
	t = kzalloc(sizeof(*t), GFP_KERNEL);
	if (t == NULL)
	return -ENOMEM;
	mutex_init(&t->lock);

	/* Now create a video4linux device */
	vd = kmalloc(sizeof(struct video_device), GFP_KERNEL);
	if (vd == NULL) {
	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;
	}
	video_set_drvdata(vd, t);

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

	static int saa5249_remove(struct i2c_client *client)
	{
	struct video_device *vd = i2c_get_clientdata(client);

	video_unregister_device(vd);
	kfree(video_get_drvdata(vd));
	kfree(vd);
	return 0;
	}

	static const struct i2c_device_id saa5249_id[] = {
	{ "saa5249", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, saa5249_id);

	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "saa5249",
	.driverid = I2C_DRIVERID_SAA5249,
	.probe = saa5249_probe,
	.remove = saa5249_remove,
	.id_table = saa5249_id,
	};