*	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 ={	name:		IF_NAME,	type:		VID_TYPE_TELETEXT,	/*| VID_TYPE_TUNER ?? */	hardware:	VID_HARDWARE_SAA5249,	open:		saa5249_open,	close:		saa5249_release,	write:		saa5249_write,	ioctl:		saa5249_ioctl,};