patch-2.4.0-test7 linux/drivers/media/video/saa5249.c

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diff -u --recursive --new-file v2.4.0-test6/linux/drivers/media/video/saa5249.c linux/drivers/media/video/saa5249.c
@@ -0,0 +1,683 @@
+/*
+ *	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 <asm/io.h>
+#include <asm/uaccess.h>
+
+#define VTX_VER_MAJ 1
+#define VTX_VER_MIN 7
+
+
+
+#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 (300*HZ/1000)			/* Time between requesting page and */
+						/* checking status bits */
+#define PGBUF_EXPIRE (15*HZ)			/* 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;
+};
+
+
+#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 (HZ/20)	/* Time required to clear a page */
+#define READY_TIMEOUT (30*HZ/1000)	/* 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 */
+
+#ifndef FALSE
+#define FALSE 0
+#define TRUE 1
+#endif
+#ifndef MIN
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#endif
+
+#define RESCHED \
+        do { \
+          if (current->need_resched) \
+            schedule(); \
+        } while (0)
+
+static struct video_device saa_template;	/* Declared near bottom */
+
+/* Addresses to scan */
+static unsigned short normal_i2c[] = {34>>1,I2C_CLIENT_END};
+static unsigned short normal_i2c_range[] = {I2C_CLIENT_END};
+static unsigned short probe[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short probe_range[2]  = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short ignore[2]       = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short force[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
+
+static struct i2c_client_address_data addr_data = {
+	normal_i2c, normal_i2c_range, 
+	probe, probe_range, 
+	ignore, ignore_range, 
+	force
+};
+
+static struct i2c_client client_template;
+
+static int saa5249_attach(struct i2c_adapter *adap, int addr, unsigned short flags, 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 = kmalloc(sizeof(*t), GFP_KERNEL);
+	if(t==NULL)
+	{
+		kfree(client);
+		return -ENOMEM;
+	}
+	memset(t, 0, sizeof(*t));
+	strcpy(client->name, IF_NAME);
+	
+	/*
+	 *	Now create a video4linux device
+	 */
+	 
+	client->data = vd=(struct video_device *)kmalloc(sizeof(struct video_device), GFP_KERNEL);
+	if(vd==NULL)
+	{
+		kfree(t);
+		kfree(client);
+		return -ENOMEM;
+	}
+	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))<0)
+	{
+		kfree(t);
+		kfree(vd);
+		kfree(client);
+		return err;
+	}
+	t->client = client;
+	i2c_attach_client(client);
+	MOD_INC_USE_COUNT;
+	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)
+{
+	/* Only attach these chips to the BT848 bus for now */
+	
+	if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_BT848))
+	{
+		return i2c_probe(adap, &addr_data, saa5249_attach);
+	}
+	return 0;
+}
+
+static int saa5249_detach(struct i2c_client *client)
+{
+	struct video_device *vd=client->data;
+	i2c_detach_client(client);
+	video_unregister_device(vd);
+	kfree(vd->priv);
+	kfree(vd);
+	kfree(client);
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+static int saa5249_command(struct i2c_client *device,
+			     unsigned int cmd, void *arg)
+{
+	return -EINVAL;
+}
+
+/* new I2C driver support */
+
+static struct i2c_driver i2c_driver_videotext = 
+{
+	IF_NAME,		/* name */
+	I2C_DRIVERID_SAA5249, /* in i2c.h */
+	I2C_DF_NOTIFY,
+	saa5249_probe,
+	saa5249_detach,
+	saa5249_command
+};
+
+static struct i2c_client client_template = {
+	"(unset)",
+	-1,
+	0,
+	0,
+	NULL,
+	&i2c_driver_videotext
+};
+
+/*
+ *	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->sigmask_lock);
+	sigfillset(&current->blocked);
+	recalc_sigpending(current);
+	spin_unlock_irq(&current->sigmask_lock);
+	current->state = TASK_INTERRUPTIBLE;
+	schedule_timeout(delay);
+
+	spin_lock_irq(&current->sigmask_lock);
+	current->blocked = oldblocked;
+	recalc_sigpending(current);
+	spin_unlock_irq(&current->sigmask_lock);
+}
+
+
+/*
+ *	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;
+	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 saa5249_ioctl(struct video_device *vd, unsigned int cmd, void *arg) 
+{
+	struct saa5249_device *t=vd->priv;
+	static int virtual_mode = FALSE;
+
+	switch(cmd) 
+	{
+		case VTXIOCGETINFO: 
+		{
+			vtx_info_t info;
+			info.version_major = VTX_VER_MAJ;
+			info.version_minor = VTX_VER_MIN;
+			info.numpages = NUM_DAUS;
+			/*info.cct_type = CCT_TYPE;*/
+			if(copy_to_user((void*)arg, &info, sizeof(vtx_info_t)))
+				return -EFAULT;
+			return 0;
+		}
+
+		case VTXIOCCLRPAGE: 
+		{
+			vtx_pagereq_t req;
+      
+			if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
+				return -EFAULT;
+			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;
+      
+			if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
+				return -EFAULT;
+			if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
+				return -EINVAL;
+			t->vdau[req.pgbuf].clrfound = TRUE;
+			return 0;
+		}
+
+		case VTXIOCPAGEREQ: 
+		{
+			vtx_pagereq_t req;
+			if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
+				return -EFAULT;
+			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;
+			u8 infobits[10];
+			vtx_pageinfo_t info;
+			int a;
+
+			if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
+				return -EFAULT;
+			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;
+			int start, end;
+
+			if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
+				return -EFAULT;
+			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;
+
+			if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
+				return -EFAULT;
+			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)arg;
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+
+static int saa5249_open(struct video_device *vd, int nb) 
+{
+	struct saa5249_device *t=vd->priv;
+	int pgbuf;
+
+	if (t->client==NULL) 
+		return -ENODEV;
+
+	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 */
+	
+	{
+		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;
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+
+
+static void saa5249_release(struct video_device *vd) 
+{
+	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 */
+	MOD_DEC_USE_COUNT;
+	return;
+}
+
+static long saa5249_write(struct video_device *v, const char *buf, unsigned long l, int nb)
+{
+	return -EINVAL;
+}
+
+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 struct video_device saa_template =
+{
+	IF_NAME,
+	VID_TYPE_TELETEXT,	/*| VID_TYPE_TUNER ?? */
+	VID_HARDWARE_SAA5249,
+	saa5249_open,
+	saa5249_release,
+	NULL,			/* read */
+	saa5249_write,
+	NULL,			/* poll */
+	saa5249_ioctl,
+	/* the rest are null */
+};
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)