Merge branch 'linus' into core/rcu
[linux-2.6] / drivers / media / video / saa5249.c
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 1998/03/30 22:23:23 alan 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 <media/v4l2-ioctl.h>
61 #include <linux/mutex.h>
62
63
64 #include <asm/io.h>
65 #include <asm/uaccess.h>
66
67 #define VTX_VER_MAJ 1
68 #define VTX_VER_MIN 8
69
70
71
72 #define NUM_DAUS 4
73 #define NUM_BUFS 8
74 #define IF_NAME "SAA5249"
75
76 static const int disp_modes[8][3] =
77 {
78         { 0x46, 0x03, 0x03 },   /* DISPOFF */
79         { 0x46, 0xcc, 0xcc },   /* DISPNORM */
80         { 0x44, 0x0f, 0x0f },   /* DISPTRANS */
81         { 0x46, 0xcc, 0x46 },   /* DISPINS */
82         { 0x44, 0x03, 0x03 },   /* DISPOFF, interlaced */
83         { 0x44, 0xcc, 0xcc },   /* DISPNORM, interlaced */
84         { 0x44, 0x0f, 0x0f },   /* DISPTRANS, interlaced */
85         { 0x44, 0xcc, 0x46 }    /* DISPINS, interlaced */
86 };
87
88
89
90 #define PAGE_WAIT    msecs_to_jiffies(300)      /* Time between requesting page and */
91                                                 /* checking status bits */
92 #define PGBUF_EXPIRE msecs_to_jiffies(15000)    /* Time to wait before retransmitting */
93                                                 /* page regardless of infobits */
94 typedef struct {
95         u8 pgbuf[VTX_VIRTUALSIZE];              /* Page-buffer */
96         u8 laststat[10];                        /* Last value of infobits for DAU */
97         u8 sregs[7];                            /* Page-request registers */
98         unsigned long expire;                   /* Time when page will be expired */
99         unsigned clrfound : 1;                  /* VTXIOCCLRFOUND has been called */
100         unsigned stopped : 1;                   /* VTXIOCSTOPDAU has been called */
101 } vdau_t;
102
103 struct saa5249_device
104 {
105         vdau_t vdau[NUM_DAUS];                  /* Data for virtual DAUs (the 5249 only has one */
106                                                 /* real DAU, so we have to simulate some more) */
107         int vtx_use_count;
108         int is_searching[NUM_DAUS];
109         int disp_mode;
110         int virtual_mode;
111         struct i2c_client *client;
112         struct mutex lock;
113 };
114
115
116 #define CCTWR 34                /* I²C write/read-address of vtx-chip */
117 #define CCTRD 35
118 #define NOACK_REPEAT 10         /* Retry access this many times on failure */
119 #define CLEAR_DELAY   msecs_to_jiffies(50)      /* Time required to clear a page */
120 #define READY_TIMEOUT msecs_to_jiffies(30)      /* Time to wait for ready signal of I2C-bus interface */
121 #define INIT_DELAY 500          /* Time in usec to wait at initialization of CEA interface */
122 #define START_DELAY 10          /* Time in usec to wait before starting write-cycle (CEA) */
123
124 #define VTX_DEV_MINOR 0
125
126 /* General defines and debugging support */
127
128 #define RESCHED do { cond_resched(); } while(0)
129
130 static struct video_device saa_template;        /* Declared near bottom */
131
132 /* Addresses to scan */
133 static unsigned short normal_i2c[] = {34>>1,I2C_CLIENT_END};
134
135 I2C_CLIENT_INSMOD;
136
137 static struct i2c_client client_template;
138
139 static int saa5249_attach(struct i2c_adapter *adap, int addr, int kind)
140 {
141         int pgbuf;
142         int err;
143         struct i2c_client *client;
144         struct video_device *vd;
145         struct saa5249_device *t;
146
147         printk(KERN_INFO "saa5249: teletext chip found.\n");
148         client=kmalloc(sizeof(*client), GFP_KERNEL);
149         if(client==NULL)
150                 return -ENOMEM;
151         client_template.adapter = adap;
152         client_template.addr = addr;
153         memcpy(client, &client_template, sizeof(*client));
154         t = kzalloc(sizeof(*t), GFP_KERNEL);
155         if(t==NULL)
156         {
157                 kfree(client);
158                 return -ENOMEM;
159         }
160         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
161         mutex_init(&t->lock);
162
163         /*
164          *      Now create a video4linux device
165          */
166
167         vd = kmalloc(sizeof(struct video_device), GFP_KERNEL);
168         if(vd==NULL)
169         {
170                 kfree(t);
171                 kfree(client);
172                 return -ENOMEM;
173         }
174         i2c_set_clientdata(client, vd);
175         memcpy(vd, &saa_template, sizeof(*vd));
176
177         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
178         {
179                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
180                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
181                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
182                 t->vdau[pgbuf].expire = 0;
183                 t->vdau[pgbuf].clrfound = true;
184                 t->vdau[pgbuf].stopped = true;
185                 t->is_searching[pgbuf] = false;
186         }
187         vd->priv=t;
188
189
190         /*
191          *      Register it
192          */
193
194         if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
195         {
196                 kfree(t);
197                 kfree(vd);
198                 kfree(client);
199                 return err;
200         }
201         t->client = client;
202         i2c_attach_client(client);
203         return 0;
204 }
205
206 /*
207  *      We do most of the hard work when we become a device on the i2c.
208  */
209
210 static int saa5249_probe(struct i2c_adapter *adap)
211 {
212         if (adap->class & I2C_CLASS_TV_ANALOG)
213                 return i2c_probe(adap, &addr_data, saa5249_attach);
214         return 0;
215 }
216
217 static int saa5249_detach(struct i2c_client *client)
218 {
219         struct video_device *vd = i2c_get_clientdata(client);
220         i2c_detach_client(client);
221         video_unregister_device(vd);
222         kfree(vd->priv);
223         kfree(vd);
224         kfree(client);
225         return 0;
226 }
227
228 /* new I2C driver support */
229
230 static struct i2c_driver i2c_driver_videotext =
231 {
232         .driver = {
233                 .name   = IF_NAME,              /* name */
234         },
235         .id             = I2C_DRIVERID_SAA5249, /* in i2c.h */
236         .attach_adapter = saa5249_probe,
237         .detach_client  = saa5249_detach,
238 };
239
240 static struct i2c_client client_template = {
241         .driver         = &i2c_driver_videotext,
242         .name           = "(unset)",
243 };
244
245 /*
246  *      Wait the given number of jiffies (10ms). This calls the scheduler, so the actual
247  *      delay may be longer.
248  */
249
250 static void jdelay(unsigned long delay)
251 {
252         sigset_t oldblocked = current->blocked;
253
254         spin_lock_irq(&current->sighand->siglock);
255         sigfillset(&current->blocked);
256         recalc_sigpending();
257         spin_unlock_irq(&current->sighand->siglock);
258         msleep_interruptible(jiffies_to_msecs(delay));
259
260         spin_lock_irq(&current->sighand->siglock);
261         current->blocked = oldblocked;
262         recalc_sigpending();
263         spin_unlock_irq(&current->sighand->siglock);
264 }
265
266
267 /*
268  *      I2C interfaces
269  */
270
271 static int i2c_sendbuf(struct saa5249_device *t, int reg, int count, u8 *data)
272 {
273         char buf[64];
274
275         buf[0] = reg;
276         memcpy(buf+1, data, count);
277
278         if(i2c_master_send(t->client, buf, count+1)==count+1)
279                 return 0;
280         return -1;
281 }
282
283 static int i2c_senddata(struct saa5249_device *t, ...)
284 {
285         unsigned char buf[64];
286         int v;
287         int ct = 0;
288         va_list argp;
289         va_start(argp,t);
290
291         while ((v = va_arg(argp, int)) != -1)
292                 buf[ct++] = v;
293
294         va_end(argp);
295         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
296 }
297
298 /* Get count number of bytes from I²C-device at address adr, store them in buf. Start & stop
299  * handshaking is done by this routine, ack will be sent after the last byte to inhibit further
300  * sending of data. If uaccess is 'true', data is written to user-space with put_user.
301  * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise
302  */
303
304 static int i2c_getdata(struct saa5249_device *t, int count, u8 *buf)
305 {
306         if(i2c_master_recv(t->client, buf, count)!=count)
307                 return -1;
308         return 0;
309 }
310
311
312 /*
313  *      Standard character-device-driver functions
314  */
315
316 static int do_saa5249_ioctl(struct inode *inode, struct file *file,
317                             unsigned int cmd, void *arg)
318 {
319         static int virtual_mode = false;
320         struct video_device *vd = video_devdata(file);
321         struct saa5249_device *t=vd->priv;
322
323         switch(cmd)
324         {
325                 case VTXIOCGETINFO:
326                 {
327                         vtx_info_t *info = arg;
328                         info->version_major = VTX_VER_MAJ;
329                         info->version_minor = VTX_VER_MIN;
330                         info->numpages = NUM_DAUS;
331                         /*info->cct_type = CCT_TYPE;*/
332                         return 0;
333                 }
334
335                 case VTXIOCCLRPAGE:
336                 {
337                         vtx_pagereq_t *req = arg;
338
339                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
340                                 return -EINVAL;
341                         memset(t->vdau[req->pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
342                         t->vdau[req->pgbuf].clrfound = true;
343                         return 0;
344                 }
345
346                 case VTXIOCCLRFOUND:
347                 {
348                         vtx_pagereq_t *req = arg;
349
350                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
351                                 return -EINVAL;
352                         t->vdau[req->pgbuf].clrfound = true;
353                         return 0;
354                 }
355
356                 case VTXIOCPAGEREQ:
357                 {
358                         vtx_pagereq_t *req = arg;
359                         if (!(req->pagemask & PGMASK_PAGE))
360                                 req->page = 0;
361                         if (!(req->pagemask & PGMASK_HOUR))
362                                 req->hour = 0;
363                         if (!(req->pagemask & PGMASK_MINUTE))
364                                 req->minute = 0;
365                         if (req->page < 0 || req->page > 0x8ff) /* 7FF ?? */
366                                 return -EINVAL;
367                         req->page &= 0x7ff;
368                         if (req->hour < 0 || req->hour > 0x3f || req->minute < 0 || req->minute > 0x7f ||
369                                 req->pagemask < 0 || req->pagemask >= PGMASK_MAX || req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
370                                 return -EINVAL;
371                         t->vdau[req->pgbuf].sregs[0] = (req->pagemask & PG_HUND ? 0x10 : 0) | (req->page / 0x100);
372                         t->vdau[req->pgbuf].sregs[1] = (req->pagemask & PG_TEN ? 0x10 : 0) | ((req->page / 0x10) & 0xf);
373                         t->vdau[req->pgbuf].sregs[2] = (req->pagemask & PG_UNIT ? 0x10 : 0) | (req->page & 0xf);
374                         t->vdau[req->pgbuf].sregs[3] = (req->pagemask & HR_TEN ? 0x10 : 0) | (req->hour / 0x10);
375                         t->vdau[req->pgbuf].sregs[4] = (req->pagemask & HR_UNIT ? 0x10 : 0) | (req->hour & 0xf);
376                         t->vdau[req->pgbuf].sregs[5] = (req->pagemask & MIN_TEN ? 0x10 : 0) | (req->minute / 0x10);
377                         t->vdau[req->pgbuf].sregs[6] = (req->pagemask & MIN_UNIT ? 0x10 : 0) | (req->minute & 0xf);
378                         t->vdau[req->pgbuf].stopped = false;
379                         t->vdau[req->pgbuf].clrfound = true;
380                         t->is_searching[req->pgbuf] = true;
381                         return 0;
382                 }
383
384                 case VTXIOCGETSTAT:
385                 {
386                         vtx_pagereq_t *req = arg;
387                         u8 infobits[10];
388                         vtx_pageinfo_t info;
389                         int a;
390
391                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
392                                 return -EINVAL;
393                         if (!t->vdau[req->pgbuf].stopped)
394                         {
395                                 if (i2c_senddata(t, 2, 0, -1) ||
396                                         i2c_sendbuf(t, 3, sizeof(t->vdau[0].sregs), t->vdau[req->pgbuf].sregs) ||
397                                         i2c_senddata(t, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) ||
398                                         i2c_senddata(t, 2, 0, t->vdau[req->pgbuf].sregs[0] | 8, -1) ||
399                                         i2c_senddata(t, 8, 0, 25, 0, -1))
400                                         return -EIO;
401                                 jdelay(PAGE_WAIT);
402                                 if (i2c_getdata(t, 10, infobits))
403                                         return -EIO;
404
405                                 if (!(infobits[8] & 0x10) && !(infobits[7] & 0xf0) &&   /* check FOUND-bit */
406                                         (memcmp(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits)) ||
407                                         time_after_eq(jiffies, t->vdau[req->pgbuf].expire)))
408                                 {               /* check if new page arrived */
409                                         if (i2c_senddata(t, 8, 0, 0, 0, -1) ||
410                                                 i2c_getdata(t, VTX_PAGESIZE, t->vdau[req->pgbuf].pgbuf))
411                                                 return -EIO;
412                                         t->vdau[req->pgbuf].expire = jiffies + PGBUF_EXPIRE;
413                                         memset(t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE, ' ', VTX_VIRTUALSIZE - VTX_PAGESIZE);
414                                         if (t->virtual_mode)
415                                         {
416                                                 /* Packet X/24 */
417                                                 if (i2c_senddata(t, 8, 0, 0x20, 0, -1) ||
418                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40))
419                                                         return -EIO;
420                                                 /* Packet X/27/0 */
421                                                 if (i2c_senddata(t, 8, 0, 0x21, 0, -1) ||
422                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40))
423                                                         return -EIO;
424                                                 /* Packet 8/30/0...8/30/15
425                                                  * FIXME: AFAIK, the 5249 does hamming-decoding for some bytes in packet 8/30,
426                                                  *        so we should undo this here.
427                                                  */
428                                                 if (i2c_senddata(t, 8, 0, 0x22, 0, -1) ||
429                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40))
430                                                         return -EIO;
431                                         }
432                                         t->vdau[req->pgbuf].clrfound = false;
433                                         memcpy(t->vdau[req->pgbuf].laststat, infobits, sizeof(infobits));
434                                 }
435                                 else
436                                 {
437                                         memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
438                                 }
439                         }
440                         else
441                         {
442                                 memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
443                         }
444
445                         info.pagenum = ((infobits[8] << 8) & 0x700) | ((infobits[1] << 4) & 0xf0) | (infobits[0] & 0x0f);
446                         if (info.pagenum < 0x100)
447                                 info.pagenum += 0x800;
448                         info.hour = ((infobits[5] << 4) & 0x30) | (infobits[4] & 0x0f);
449                         info.minute = ((infobits[3] << 4) & 0x70) | (infobits[2] & 0x0f);
450                         info.charset = ((infobits[7] >> 1) & 7);
451                         info.delete = !!(infobits[3] & 8);
452                         info.headline = !!(infobits[5] & 4);
453                         info.subtitle = !!(infobits[5] & 8);
454                         info.supp_header = !!(infobits[6] & 1);
455                         info.update = !!(infobits[6] & 2);
456                         info.inter_seq = !!(infobits[6] & 4);
457                         info.dis_disp = !!(infobits[6] & 8);
458                         info.serial = !!(infobits[7] & 1);
459                         info.notfound = !!(infobits[8] & 0x10);
460                         info.pblf = !!(infobits[9] & 0x20);
461                         info.hamming = 0;
462                         for (a = 0; a <= 7; a++)
463                         {
464                                 if (infobits[a] & 0xf0)
465                                 {
466                                         info.hamming = 1;
467                                         break;
468                                 }
469                         }
470                         if (t->vdau[req->pgbuf].clrfound)
471                                 info.notfound = 1;
472                         if(copy_to_user(req->buffer, &info, sizeof(vtx_pageinfo_t)))
473                                 return -EFAULT;
474                         if (!info.hamming && !info.notfound)
475                         {
476                                 t->is_searching[req->pgbuf] = false;
477                         }
478                         return 0;
479                 }
480
481                 case VTXIOCGETPAGE:
482                 {
483                         vtx_pagereq_t *req = arg;
484                         int start, end;
485
486                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || req->start < 0 ||
487                                 req->start > req->end || req->end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE))
488                                 return -EINVAL;
489                         if(copy_to_user(req->buffer, &t->vdau[req->pgbuf].pgbuf[req->start], req->end - req->start + 1))
490                                 return -EFAULT;
491
492                          /*
493                           *     Always read the time directly from SAA5249
494                           */
495
496                         if (req->start <= 39 && req->end >= 32)
497                         {
498                                 int len;
499                                 char buf[16];
500                                 start = max(req->start, 32);
501                                 end = min(req->end, 39);
502                                 len=end-start+1;
503                                 if (i2c_senddata(t, 8, 0, 0, start, -1) ||
504                                         i2c_getdata(t, len, buf))
505                                         return -EIO;
506                                 if(copy_to_user(req->buffer+start-req->start, buf, len))
507                                         return -EFAULT;
508                         }
509                         /* Insert the current header if DAU is still searching for a page */
510                         if (req->start <= 31 && req->end >= 7 && t->is_searching[req->pgbuf])
511                         {
512                                 char buf[32];
513                                 int len;
514                                 start = max(req->start, 7);
515                                 end = min(req->end, 31);
516                                 len=end-start+1;
517                                 if (i2c_senddata(t, 8, 0, 0, start, -1) ||
518                                         i2c_getdata(t, len, buf))
519                                         return -EIO;
520                                 if(copy_to_user(req->buffer+start-req->start, buf, len))
521                                         return -EFAULT;
522                         }
523                         return 0;
524                 }
525
526                 case VTXIOCSTOPDAU:
527                 {
528                         vtx_pagereq_t *req = arg;
529
530                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
531                                 return -EINVAL;
532                         t->vdau[req->pgbuf].stopped = true;
533                         t->is_searching[req->pgbuf] = false;
534                         return 0;
535                 }
536
537                 case VTXIOCPUTPAGE:
538                 case VTXIOCSETDISP:
539                 case VTXIOCPUTSTAT:
540                         return 0;
541
542                 case VTXIOCCLRCACHE:
543                 {
544                         if (i2c_senddata(t, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, 11,
545                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
546                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', -1))
547                                 return -EIO;
548                         if (i2c_senddata(t, 3, 0x20, -1))
549                                 return -EIO;
550                         jdelay(10 * CLEAR_DELAY);                       /* I have no idea how long we have to wait here */
551                         return 0;
552                 }
553
554                 case VTXIOCSETVIRT:
555                 {
556                         /* The SAA5249 has virtual-row reception turned on always */
557                         t->virtual_mode = (int)(long)arg;
558                         return 0;
559                 }
560         }
561         return -EINVAL;
562 }
563
564 /*
565  * Translates old vtx IOCTLs to new ones
566  *
567  * This keeps new kernel versions compatible with old userspace programs.
568  */
569 static inline unsigned int vtx_fix_command(unsigned int cmd)
570 {
571         switch (cmd) {
572         case VTXIOCGETINFO_OLD:
573                 cmd = VTXIOCGETINFO;
574                 break;
575         case VTXIOCCLRPAGE_OLD:
576                 cmd = VTXIOCCLRPAGE;
577                 break;
578         case VTXIOCCLRFOUND_OLD:
579                 cmd = VTXIOCCLRFOUND;
580                 break;
581         case VTXIOCPAGEREQ_OLD:
582                 cmd = VTXIOCPAGEREQ;
583                 break;
584         case VTXIOCGETSTAT_OLD:
585                 cmd = VTXIOCGETSTAT;
586                 break;
587         case VTXIOCGETPAGE_OLD:
588                 cmd = VTXIOCGETPAGE;
589                 break;
590         case VTXIOCSTOPDAU_OLD:
591                 cmd = VTXIOCSTOPDAU;
592                 break;
593         case VTXIOCPUTPAGE_OLD:
594                 cmd = VTXIOCPUTPAGE;
595                 break;
596         case VTXIOCSETDISP_OLD:
597                 cmd = VTXIOCSETDISP;
598                 break;
599         case VTXIOCPUTSTAT_OLD:
600                 cmd = VTXIOCPUTSTAT;
601                 break;
602         case VTXIOCCLRCACHE_OLD:
603                 cmd = VTXIOCCLRCACHE;
604                 break;
605         case VTXIOCSETVIRT_OLD:
606                 cmd = VTXIOCSETVIRT;
607                 break;
608         }
609         return cmd;
610 }
611
612 /*
613  *      Handle the locking
614  */
615
616 static int saa5249_ioctl(struct inode *inode, struct file *file,
617                          unsigned int cmd, unsigned long arg)
618 {
619         struct video_device *vd = video_devdata(file);
620         struct saa5249_device *t=vd->priv;
621         int err;
622
623         cmd = vtx_fix_command(cmd);
624         mutex_lock(&t->lock);
625         err = video_usercopy(inode,file,cmd,arg,do_saa5249_ioctl);
626         mutex_unlock(&t->lock);
627         return err;
628 }
629
630 static int saa5249_open(struct inode *inode, struct file *file)
631 {
632         struct video_device *vd = video_devdata(file);
633         struct saa5249_device *t=vd->priv;
634         int err,pgbuf;
635
636         err = video_exclusive_open(inode,file);
637         if (err < 0)
638                 return err;
639
640         if (t->client==NULL) {
641                 err = -ENODEV;
642                 goto fail;
643         }
644
645         if (i2c_senddata(t, 0, 0, -1) ||                /* Select R11 */
646                                                 /* Turn off parity checks (we do this ourselves) */
647                 i2c_senddata(t, 1, disp_modes[t->disp_mode][0], 0, -1) ||
648                                                 /* Display TV-picture, no virtual rows */
649                 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 */
650
651         {
652                 err = -EIO;
653                 goto fail;
654         }
655
656         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
657         {
658                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
659                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
660                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
661                 t->vdau[pgbuf].expire = 0;
662                 t->vdau[pgbuf].clrfound = true;
663                 t->vdau[pgbuf].stopped = true;
664                 t->is_searching[pgbuf] = false;
665         }
666         t->virtual_mode = false;
667         return 0;
668
669  fail:
670         video_exclusive_release(inode,file);
671         return err;
672 }
673
674
675
676 static int saa5249_release(struct inode *inode, struct file *file)
677 {
678         struct video_device *vd = video_devdata(file);
679         struct saa5249_device *t=vd->priv;
680         i2c_senddata(t, 1, 0x20, -1);           /* Turn off CCT */
681         i2c_senddata(t, 5, 3, 3, -1);           /* Turn off TV-display */
682         video_exclusive_release(inode,file);
683         return 0;
684 }
685
686 static int __init init_saa_5249 (void)
687 {
688         printk(KERN_INFO "SAA5249 driver (" IF_NAME " interface) for VideoText version %d.%d\n",
689                         VTX_VER_MAJ, VTX_VER_MIN);
690         return i2c_add_driver(&i2c_driver_videotext);
691 }
692
693 static void __exit cleanup_saa_5249 (void)
694 {
695         i2c_del_driver(&i2c_driver_videotext);
696 }
697
698 module_init(init_saa_5249);
699 module_exit(cleanup_saa_5249);
700
701 static const struct file_operations saa_fops = {
702         .owner          = THIS_MODULE,
703         .open           = saa5249_open,
704         .release        = saa5249_release,
705         .ioctl          = saa5249_ioctl,
706 #ifdef CONFIG_COMPAT
707         .compat_ioctl   = v4l_compat_ioctl32,
708 #endif
709         .llseek         = no_llseek,
710 };
711
712 static struct video_device saa_template =
713 {
714         .name           = IF_NAME,
715         .fops           = &saa_fops,
716 };
717
718 MODULE_LICENSE("GPL");