1/*
2 * Modified in order to keep it compatible both with new and old videotext IOCTLs by
3 * Michael Geng <linux@MichaelGeng.de>
4 *
5 *	Cleaned up to use existing videodev interface and allow the idea
6 *	of multiple teletext decoders on the video4linux iface. Changed i2c
7 *	to cover addressing clashes on device busses. It's also rebuilt so
8 *	you can add arbitary multiple teletext devices to Linux video4linux
9 *	now (well 32 anyway).
10 *
11 *	Alan Cox <Alan.Cox@linux.org>
12 *
13 *	The original driver was heavily modified to match the i2c interface
14 *	It was truncated to use the WinTV boards, too.
15 *
16 *	Copyright (c) 1998 Richard Guenther <richard.guenther@student.uni-tuebingen.de>
17 *
18 * $Id: saa5249.c,v 1.1.1.1 2007/08/03 18:52:40 Exp $
19 *
20 *	Derived From
21 *
22 * vtx.c:
23 * This is a loadable character-device-driver for videotext-interfaces
24 * (aka teletext). Please check the Makefile/README for a list of supported
25 * interfaces.
26 *
27 * Copyright (c) 1994-97 Martin Buck  <martin-2.buck@student.uni-ulm.de>
28 *
29 *
30 * This program is free software; you can redistribute it and/or modify
31 * it under the terms of the GNU General Public License as published by
32 * the Free Software Foundation; either version 2 of the License, or
33 * (at your option) any later version.
34 *
35 * This program is distributed in the hope that it will be useful,
36 * but WITHOUT ANY WARRANTY; without even the implied warranty of
37 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
38 * GNU General Public License for more details.
39 *
40 * You should have received a copy of the GNU General Public License
41 * along with this program; if not, write to the Free Software
42 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
43 * USA.
44 */
45
46#include <linux/module.h>
47#include <linux/kernel.h>
48#include <linux/sched.h>
49#include <linux/mm.h>
50#include <linux/errno.h>
51#include <linux/delay.h>
52#include <linux/ioport.h>
53#include <linux/slab.h>
54#include <linux/init.h>
55#include <stdarg.h>
56#include <linux/i2c.h>
57#include <linux/videotext.h>
58#include <linux/videodev.h>
59#include <media/v4l2-common.h>
60#include <linux/mutex.h>
61
62
63#include <asm/io.h>
64#include <asm/uaccess.h>
65
66#define VTX_VER_MAJ 1
67#define VTX_VER_MIN 8
68
69
70
71#define NUM_DAUS 4
72#define NUM_BUFS 8
73#define IF_NAME "SAA5249"
74
75static const int disp_modes[8][3] =
76{
77	{ 0x46, 0x03, 0x03 },	/* DISPOFF */
78	{ 0x46, 0xcc, 0xcc },	/* DISPNORM */
79	{ 0x44, 0x0f, 0x0f },	/* DISPTRANS */
80	{ 0x46, 0xcc, 0x46 },	/* DISPINS */
81	{ 0x44, 0x03, 0x03 },	/* DISPOFF, interlaced */
82	{ 0x44, 0xcc, 0xcc },	/* DISPNORM, interlaced */
83	{ 0x44, 0x0f, 0x0f },	/* DISPTRANS, interlaced */
84	{ 0x44, 0xcc, 0x46 }	/* DISPINS, interlaced */
85};
86
87
88
89#define PAGE_WAIT (300*HZ/1000)			/* Time between requesting page and */
90						/* checking status bits */
91#define PGBUF_EXPIRE (15*HZ)			/* Time to wait before retransmitting */
92						/* page regardless of infobits */
93typedef struct {
94	u8 pgbuf[VTX_VIRTUALSIZE];		/* Page-buffer */
95	u8 laststat[10];			/* Last value of infobits for DAU */
96	u8 sregs[7];				/* Page-request registers */
97	unsigned long expire;			/* Time when page will be expired */
98	unsigned clrfound : 1;			/* VTXIOCCLRFOUND has been called */
99	unsigned stopped : 1;			/* VTXIOCSTOPDAU has been called */
100} vdau_t;
101
102struct saa5249_device
103{
104	vdau_t vdau[NUM_DAUS];			/* Data for virtual DAUs (the 5249 only has one */
105						/* real DAU, so we have to simulate some more) */
106	int vtx_use_count;
107	int is_searching[NUM_DAUS];
108	int disp_mode;
109	int virtual_mode;
110	struct i2c_client *client;
111	struct mutex lock;
112};
113
114
115#define CCTWR 34		/* I�C write/read-address of vtx-chip */
116#define CCTRD 35
117#define NOACK_REPEAT 10		/* Retry access this many times on failure */
118#define CLEAR_DELAY (HZ/20)	/* Time required to clear a page */
119#define READY_TIMEOUT (30*HZ/1000)	/* Time to wait for ready signal of I�C-bus interface */
120#define INIT_DELAY 500		/* Time in usec to wait at initialization of CEA interface */
121#define START_DELAY 10		/* Time in usec to wait before starting write-cycle (CEA) */
122
123#define VTX_DEV_MINOR 0
124
125/* General defines and debugging support */
126
127#define RESCHED do { cond_resched(); } while(0)
128
129static struct video_device saa_template;	/* Declared near bottom */
130
131/* Addresses to scan */
132static unsigned short normal_i2c[] = {34>>1,I2C_CLIENT_END};
133I2C_CLIENT_INSMOD;
134
135static struct i2c_client client_template;
136
137static int saa5249_attach(struct i2c_adapter *adap, int addr, int kind)
138{
139	int pgbuf;
140	int err;
141	struct i2c_client *client;
142	struct video_device *vd;
143	struct saa5249_device *t;
144
145	printk(KERN_INFO "saa5249: teletext chip found.\n");
146	client=kmalloc(sizeof(*client), GFP_KERNEL);
147	if(client==NULL)
148		return -ENOMEM;
149	client_template.adapter = adap;
150	client_template.addr = addr;
151	memcpy(client, &client_template, sizeof(*client));
152	t = kzalloc(sizeof(*t), GFP_KERNEL);
153	if(t==NULL)
154	{
155		kfree(client);
156		return -ENOMEM;
157	}
158	strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
159	mutex_init(&t->lock);
160
161	/*
162	 *	Now create a video4linux device
163	 */
164
165	vd = kmalloc(sizeof(struct video_device), GFP_KERNEL);
166	if(vd==NULL)
167	{
168		kfree(t);
169		kfree(client);
170		return -ENOMEM;
171	}
172	i2c_set_clientdata(client, vd);
173	memcpy(vd, &saa_template, sizeof(*vd));
174
175	for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
176	{
177		memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
178		memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
179		memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
180		t->vdau[pgbuf].expire = 0;
181		t->vdau[pgbuf].clrfound = true;
182		t->vdau[pgbuf].stopped = true;
183		t->is_searching[pgbuf] = false;
184	}
185	vd->priv=t;
186
187
188	/*
189	 *	Register it
190	 */
191
192	if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
193	{
194		kfree(t);
195		kfree(vd);
196		kfree(client);
197		return err;
198	}
199	t->client = client;
200	i2c_attach_client(client);
201	return 0;
202}
203
204/*
205 *	We do most of the hard work when we become a device on the i2c.
206 */
207
208static int saa5249_probe(struct i2c_adapter *adap)
209{
210	if (adap->class & I2C_CLASS_TV_ANALOG)
211		return i2c_probe(adap, &addr_data, saa5249_attach);
212	return 0;
213}
214
215static int saa5249_detach(struct i2c_client *client)
216{
217	struct video_device *vd = i2c_get_clientdata(client);
218	i2c_detach_client(client);
219	video_unregister_device(vd);
220	kfree(vd->priv);
221	kfree(vd);
222	kfree(client);
223	return 0;
224}
225
226/* new I2C driver support */
227
228static struct i2c_driver i2c_driver_videotext =
229{
230	.driver = {
231		.name 	= IF_NAME,		/* name */
232	},
233	.id 		= I2C_DRIVERID_SAA5249, /* in i2c.h */
234	.attach_adapter = saa5249_probe,
235	.detach_client  = saa5249_detach,
236};
237
238static struct i2c_client client_template = {
239	.driver		= &i2c_driver_videotext,
240	.name		= "(unset)",
241};
242
243/*
244 *	Wait the given number of jiffies (10ms). This calls the scheduler, so the actual
245 *	delay may be longer.
246 */
247
248static void jdelay(unsigned long delay)
249{
250	sigset_t oldblocked = current->blocked;
251
252	spin_lock_irq(&current->sighand->siglock);
253	sigfillset(&current->blocked);
254	recalc_sigpending();
255	spin_unlock_irq(&current->sighand->siglock);
256	msleep_interruptible(jiffies_to_msecs(delay));
257
258	spin_lock_irq(&current->sighand->siglock);
259	current->blocked = oldblocked;
260	recalc_sigpending();
261	spin_unlock_irq(&current->sighand->siglock);
262}
263
264
265/*
266 *	I2C interfaces
267 */
268
269static int i2c_sendbuf(struct saa5249_device *t, int reg, int count, u8 *data)
270{
271	char buf[64];
272
273	buf[0] = reg;
274	memcpy(buf+1, data, count);
275
276	if(i2c_master_send(t->client, buf, count+1)==count+1)
277		return 0;
278	return -1;
279}
280
281static int i2c_senddata(struct saa5249_device *t, ...)
282{
283	unsigned char buf[64];
284	int v;
285	int ct=0;
286	va_list argp;
287	va_start(argp,t);
288
289	while((v=va_arg(argp,int))!=-1)
290		buf[ct++]=v;
291	return i2c_sendbuf(t, buf[0], ct-1, buf+1);
292}
293
294/* Get count number of bytes from I�C-device at address adr, store them in buf. Start & stop
295 * handshaking is done by this routine, ack will be sent after the last byte to inhibit further
296 * sending of data. If uaccess is 'true', data is written to user-space with put_user.
297 * Returns -1 if I�C-device didn't send acknowledge, 0 otherwise
298 */
299
300static int i2c_getdata(struct saa5249_device *t, int count, u8 *buf)
301{
302	if(i2c_master_recv(t->client, buf, count)!=count)
303		return -1;
304	return 0;
305}
306
307
308/*
309 *	Standard character-device-driver functions
310 */
311
312static int do_saa5249_ioctl(struct inode *inode, struct file *file,
313			    unsigned int cmd, void *arg)
314{
315	static int virtual_mode = false;
316	struct video_device *vd = video_devdata(file);
317	struct saa5249_device *t=vd->priv;
318
319	switch(cmd)
320	{
321		case VTXIOCGETINFO:
322		{
323			vtx_info_t *info = arg;
324			info->version_major = VTX_VER_MAJ;
325			info->version_minor = VTX_VER_MIN;
326			info->numpages = NUM_DAUS;
327			/*info->cct_type = CCT_TYPE;*/
328			return 0;
329		}
330
331		case VTXIOCCLRPAGE:
332		{
333			vtx_pagereq_t *req = arg;
334
335			if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
336				return -EINVAL;
337			memset(t->vdau[req->pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
338			t->vdau[req->pgbuf].clrfound = true;
339			return 0;
340		}
341
342		case VTXIOCCLRFOUND:
343		{
344			vtx_pagereq_t *req = arg;
345
346			if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
347				return -EINVAL;
348			t->vdau[req->pgbuf].clrfound = true;
349			return 0;
350		}
351
352		case VTXIOCPAGEREQ:
353		{
354			vtx_pagereq_t *req = arg;
355			if (!(req->pagemask & PGMASK_PAGE))
356				req->page = 0;
357			if (!(req->pagemask & PGMASK_HOUR))
358				req->hour = 0;
359			if (!(req->pagemask & PGMASK_MINUTE))
360				req->minute = 0;
361			if (req->page < 0 || req->page > 0x8ff) /* 7FF ?? */
362				return -EINVAL;
363			req->page &= 0x7ff;
364			if (req->hour < 0 || req->hour > 0x3f || req->minute < 0 || req->minute > 0x7f ||
365				req->pagemask < 0 || req->pagemask >= PGMASK_MAX || req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
366				return -EINVAL;
367			t->vdau[req->pgbuf].sregs[0] = (req->pagemask & PG_HUND ? 0x10 : 0) | (req->page / 0x100);
368			t->vdau[req->pgbuf].sregs[1] = (req->pagemask & PG_TEN ? 0x10 : 0) | ((req->page / 0x10) & 0xf);
369			t->vdau[req->pgbuf].sregs[2] = (req->pagemask & PG_UNIT ? 0x10 : 0) | (req->page & 0xf);
370			t->vdau[req->pgbuf].sregs[3] = (req->pagemask & HR_TEN ? 0x10 : 0) | (req->hour / 0x10);
371			t->vdau[req->pgbuf].sregs[4] = (req->pagemask & HR_UNIT ? 0x10 : 0) | (req->hour & 0xf);
372			t->vdau[req->pgbuf].sregs[5] = (req->pagemask & MIN_TEN ? 0x10 : 0) | (req->minute / 0x10);
373			t->vdau[req->pgbuf].sregs[6] = (req->pagemask & MIN_UNIT ? 0x10 : 0) | (req->minute & 0xf);
374			t->vdau[req->pgbuf].stopped = false;
375			t->vdau[req->pgbuf].clrfound = true;
376			t->is_searching[req->pgbuf] = true;
377			return 0;
378		}
379
380		case VTXIOCGETSTAT:
381		{
382			vtx_pagereq_t *req = arg;
383			u8 infobits[10];
384			vtx_pageinfo_t info;
385			int a;
386
387			if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
388				return -EINVAL;
389			if (!t->vdau[req->pgbuf].stopped)
390			{
391				if (i2c_senddata(t, 2, 0, -1) ||
392					i2c_sendbuf(t, 3, sizeof(t->vdau[0].sregs), t->vdau[req->pgbuf].sregs) ||
393					i2c_senddata(t, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) ||
394					i2c_senddata(t, 2, 0, t->vdau[req->pgbuf].sregs[0] | 8, -1) ||
395					i2c_senddata(t, 8, 0, 25, 0, -1))
396					return -EIO;
397				jdelay(PAGE_WAIT);
398				if (i2c_getdata(t, 10, infobits))
399					return -EIO;
400
401				if (!(infobits[8] & 0x10) && !(infobits[7] & 0xf0) &&	/* check FOUND-bit */
402					(memcmp(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits)) ||
403					time_after_eq(jiffies, t->vdau[req->pgbuf].expire)))
404				{		/* check if new page arrived */
405					if (i2c_senddata(t, 8, 0, 0, 0, -1) ||
406						i2c_getdata(t, VTX_PAGESIZE, t->vdau[req->pgbuf].pgbuf))
407						return -EIO;
408					t->vdau[req->pgbuf].expire = jiffies + PGBUF_EXPIRE;
409					memset(t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE, ' ', VTX_VIRTUALSIZE - VTX_PAGESIZE);
410					if (t->virtual_mode)
411					{
412						/* Packet X/24 */
413						if (i2c_senddata(t, 8, 0, 0x20, 0, -1) ||
414							i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40))
415							return -EIO;
416						/* Packet X/27/0 */
417						if (i2c_senddata(t, 8, 0, 0x21, 0, -1) ||
418							i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40))
419							return -EIO;
420						if (i2c_senddata(t, 8, 0, 0x22, 0, -1) ||
421							i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40))
422							return -EIO;
423					}
424					t->vdau[req->pgbuf].clrfound = false;
425					memcpy(t->vdau[req->pgbuf].laststat, infobits, sizeof(infobits));
426				}
427				else
428				{
429					memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
430				}
431			}
432			else
433			{
434				memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
435			}
436
437			info.pagenum = ((infobits[8] << 8) & 0x700) | ((infobits[1] << 4) & 0xf0) | (infobits[0] & 0x0f);
438			if (info.pagenum < 0x100)
439				info.pagenum += 0x800;
440			info.hour = ((infobits[5] << 4) & 0x30) | (infobits[4] & 0x0f);
441			info.minute = ((infobits[3] << 4) & 0x70) | (infobits[2] & 0x0f);
442			info.charset = ((infobits[7] >> 1) & 7);
443			info.delete = !!(infobits[3] & 8);
444			info.headline = !!(infobits[5] & 4);
445			info.subtitle = !!(infobits[5] & 8);
446			info.supp_header = !!(infobits[6] & 1);
447			info.update = !!(infobits[6] & 2);
448			info.inter_seq = !!(infobits[6] & 4);
449			info.dis_disp = !!(infobits[6] & 8);
450			info.serial = !!(infobits[7] & 1);
451			info.notfound = !!(infobits[8] & 0x10);
452			info.pblf = !!(infobits[9] & 0x20);
453			info.hamming = 0;
454			for (a = 0; a <= 7; a++)
455			{
456				if (infobits[a] & 0xf0)
457				{
458					info.hamming = 1;
459					break;
460				}
461			}
462			if (t->vdau[req->pgbuf].clrfound)
463				info.notfound = 1;
464			if(copy_to_user(req->buffer, &info, sizeof(vtx_pageinfo_t)))
465				return -EFAULT;
466			if (!info.hamming && !info.notfound)
467			{
468				t->is_searching[req->pgbuf] = false;
469			}
470			return 0;
471		}
472
473		case VTXIOCGETPAGE:
474		{
475			vtx_pagereq_t *req = arg;
476			int start, end;
477
478			if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || req->start < 0 ||
479				req->start > req->end || req->end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE))
480				return -EINVAL;
481			if(copy_to_user(req->buffer, &t->vdau[req->pgbuf].pgbuf[req->start], req->end - req->start + 1))
482				return -EFAULT;
483
484			 /*
485			  *	Always read the time directly from SAA5249
486			  */
487
488			if (req->start <= 39 && req->end >= 32)
489			{
490				int len;
491				char buf[16];
492				start = max(req->start, 32);
493				end = min(req->end, 39);
494				len=end-start+1;
495				if (i2c_senddata(t, 8, 0, 0, start, -1) ||
496					i2c_getdata(t, len, buf))
497					return -EIO;
498				if(copy_to_user(req->buffer+start-req->start, buf, len))
499					return -EFAULT;
500			}
501			/* Insert the current header if DAU is still searching for a page */
502			if (req->start <= 31 && req->end >= 7 && t->is_searching[req->pgbuf])
503			{
504				char buf[32];
505				int len;
506				start = max(req->start, 7);
507				end = min(req->end, 31);
508				len=end-start+1;
509				if (i2c_senddata(t, 8, 0, 0, start, -1) ||
510					i2c_getdata(t, len, buf))
511					return -EIO;
512				if(copy_to_user(req->buffer+start-req->start, buf, len))
513					return -EFAULT;
514			}
515			return 0;
516		}
517
518		case VTXIOCSTOPDAU:
519		{
520			vtx_pagereq_t *req = arg;
521
522			if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
523				return -EINVAL;
524			t->vdau[req->pgbuf].stopped = true;
525			t->is_searching[req->pgbuf] = false;
526			return 0;
527		}
528
529		case VTXIOCPUTPAGE:
530		case VTXIOCSETDISP:
531		case VTXIOCPUTSTAT:
532			return 0;
533
534		case VTXIOCCLRCACHE:
535		{
536			if (i2c_senddata(t, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, 11,
537				' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
538				' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', -1))
539				return -EIO;
540			if (i2c_senddata(t, 3, 0x20, -1))
541				return -EIO;
542			jdelay(10 * CLEAR_DELAY);			/* I have no idea how long we have to wait here */
543			return 0;
544		}
545
546		case VTXIOCSETVIRT:
547		{
548			/* The SAA5249 has virtual-row reception turned on always */
549			t->virtual_mode = (int)(long)arg;
550			return 0;
551		}
552	}
553	return -EINVAL;
554}
555
556/*
557 * Translates old vtx IOCTLs to new ones
558 *
559 * This keeps new kernel versions compatible with old userspace programs.
560 */
561static inline unsigned int vtx_fix_command(unsigned int cmd)
562{
563	switch (cmd) {
564	case VTXIOCGETINFO_OLD:
565		cmd = VTXIOCGETINFO;
566		break;
567	case VTXIOCCLRPAGE_OLD:
568		cmd = VTXIOCCLRPAGE;
569		break;
570	case VTXIOCCLRFOUND_OLD:
571		cmd = VTXIOCCLRFOUND;
572		break;
573	case VTXIOCPAGEREQ_OLD:
574		cmd = VTXIOCPAGEREQ;
575		break;
576	case VTXIOCGETSTAT_OLD:
577		cmd = VTXIOCGETSTAT;
578		break;
579	case VTXIOCGETPAGE_OLD:
580		cmd = VTXIOCGETPAGE;
581		break;
582	case VTXIOCSTOPDAU_OLD:
583		cmd = VTXIOCSTOPDAU;
584		break;
585	case VTXIOCPUTPAGE_OLD:
586		cmd = VTXIOCPUTPAGE;
587		break;
588	case VTXIOCSETDISP_OLD:
589		cmd = VTXIOCSETDISP;
590		break;
591	case VTXIOCPUTSTAT_OLD:
592		cmd = VTXIOCPUTSTAT;
593		break;
594	case VTXIOCCLRCACHE_OLD:
595		cmd = VTXIOCCLRCACHE;
596		break;
597	case VTXIOCSETVIRT_OLD:
598		cmd = VTXIOCSETVIRT;
599		break;
600	}
601	return cmd;
602}
603
604/*
605 *	Handle the locking
606 */
607
608static int saa5249_ioctl(struct inode *inode, struct file *file,
609			 unsigned int cmd, unsigned long arg)
610{
611	struct video_device *vd = video_devdata(file);
612	struct saa5249_device *t=vd->priv;
613	int err;
614
615	cmd = vtx_fix_command(cmd);
616	mutex_lock(&t->lock);
617	err = video_usercopy(inode,file,cmd,arg,do_saa5249_ioctl);
618	mutex_unlock(&t->lock);
619	return err;
620}
621
622static int saa5249_open(struct inode *inode, struct file *file)
623{
624	struct video_device *vd = video_devdata(file);
625	struct saa5249_device *t=vd->priv;
626	int err,pgbuf;
627
628	err = video_exclusive_open(inode,file);
629	if (err < 0)
630		return err;
631
632	if (t->client==NULL) {
633		err = -ENODEV;
634		goto fail;
635	}
636
637	if (i2c_senddata(t, 0, 0, -1) ||		/* Select R11 */
638						/* Turn off parity checks (we do this ourselves) */
639		i2c_senddata(t, 1, disp_modes[t->disp_mode][0], 0, -1) ||
640						/* Display TV-picture, no virtual rows */
641		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 */
642
643	{
644		err = -EIO;
645		goto fail;
646	}
647
648	for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
649	{
650		memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
651		memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
652		memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
653		t->vdau[pgbuf].expire = 0;
654		t->vdau[pgbuf].clrfound = true;
655		t->vdau[pgbuf].stopped = true;
656		t->is_searching[pgbuf] = false;
657	}
658	t->virtual_mode = false;
659	return 0;
660
661 fail:
662	video_exclusive_release(inode,file);
663	return err;
664}
665
666
667
668static int saa5249_release(struct inode *inode, struct file *file)
669{
670	struct video_device *vd = video_devdata(file);
671	struct saa5249_device *t=vd->priv;
672	i2c_senddata(t, 1, 0x20, -1);		/* Turn off CCT */
673	i2c_senddata(t, 5, 3, 3, -1);		/* Turn off TV-display */
674	video_exclusive_release(inode,file);
675	return 0;
676}
677
678static int __init init_saa_5249 (void)
679{
680	printk(KERN_INFO "SAA5249 driver (" IF_NAME " interface) for VideoText version %d.%d\n",
681			VTX_VER_MAJ, VTX_VER_MIN);
682	return i2c_add_driver(&i2c_driver_videotext);
683}
684
685static void __exit cleanup_saa_5249 (void)
686{
687	i2c_del_driver(&i2c_driver_videotext);
688}
689
690module_init(init_saa_5249);
691module_exit(cleanup_saa_5249);
692
693static const struct file_operations saa_fops = {
694	.owner		= THIS_MODULE,
695	.open		= saa5249_open,
696	.release       	= saa5249_release,
697	.ioctl          = saa5249_ioctl,
698	.compat_ioctl	= v4l_compat_ioctl32,
699	.llseek         = no_llseek,
700};
701
702static struct video_device saa_template =
703{
704	.owner		= THIS_MODULE,
705	.name		= IF_NAME,
706	.type		= VID_TYPE_TELETEXT,	/*| VID_TYPE_TUNER ?? */
707	.fops           = &saa_fops,
708};
709
710MODULE_LICENSE("GPL");
711