drivers/media/video/saa5249.c

   1 /*
   2  *      Cleaned up to use existing videodev interface and allow the idea
   3  *      of multiple teletext decoders on the video4linux iface. Changed i2c
   4  *      to cover addressing clashes on device busses. It's also rebuilt so
   5  *      you can add arbitary multiple teletext devices to Linux video4linux
   6  *      now (well 32 anyway).
   7  *
   8  *      Alan Cox <Alan.Cox@linux.org>
   9  *
  10  *      The original driver was heavily modified to match the i2c interface
  11  *      It was truncated to use the WinTV boards, too.
  12  *
  13  *      Copyright (c) 1998 Richard Guenther <richard.guenther@student.uni-tuebingen.de>
  14  *
  15  * $Id: saa5249.c,v 1.1 1998/03/30 22:23:23 alan Exp $
  16  *
  17  *      Derived From
  18  *
  19  * vtx.c:
  20  * This is a loadable character-device-driver for videotext-interfaces
  21  * (aka teletext). Please check the Makefile/README for a list of supported
  22  * interfaces.
  23  *
  24  * Copyright (c) 1994-97 Martin Buck  <martin-2.buck@student.uni-ulm.de>
  25  *
  26  *
  27  * This program is free software; you can redistribute it and/or modify
  28  * it under the terms of the GNU General Public License as published by
  29  * the Free Software Foundation; either version 2 of the License, or
  30  * (at your option) any later version.
  31  *
  32  * This program is distributed in the hope that it will be useful,
  33  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  34  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  35  * GNU General Public License for more details.
  36  *
  37  * You should have received a copy of the GNU General Public License
  38  * along with this program; if not, write to the Free Software
  39  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  40  * USA.
  41  */
  42
  43 #include <linux/module.h>
  44 #include <linux/kernel.h>
  45 #include <linux/sched.h>
  46 #include <linux/mm.h>
  47 #include <linux/errno.h>
  48 #include <linux/delay.h>
  49 #include <linux/ioport.h>
  50 #include <linux/slab.h>
  51 #include <linux/init.h>
  52 #include <stdarg.h>
  53 #include <linux/i2c.h>
  54 #include <linux/videotext.h>
  55 #include <linux/videodev.h>
  56
  57 #include <asm/io.h>
  58 #include <asm/uaccess.h>
  59
  60 #define VTX_VER_MAJ 1
  61 #define VTX_VER_MIN 7
  62
  63
  64
  65 #define NUM_DAUS 4
  66 #define NUM_BUFS 8
  67 #define IF_NAME "SAA5249"
  68
  69 static const int disp_modes[8][3] =
  70 {
  71         { 0x46, 0x03, 0x03 },   /* DISPOFF */
  72         { 0x46, 0xcc, 0xcc },   /* DISPNORM */
  73         { 0x44, 0x0f, 0x0f },   /* DISPTRANS */
  74         { 0x46, 0xcc, 0x46 },   /* DISPINS */
  75         { 0x44, 0x03, 0x03 },   /* DISPOFF, interlaced */
  76         { 0x44, 0xcc, 0xcc },   /* DISPNORM, interlaced */
  77         { 0x44, 0x0f, 0x0f },   /* DISPTRANS, interlaced */
  78         { 0x44, 0xcc, 0x46 }    /* DISPINS, interlaced */
  79 };
  80
  81
  82
  83 #define PAGE_WAIT (300*HZ/1000)                 /* Time between requesting page and */
  84                                                 /* checking status bits */
  85 #define PGBUF_EXPIRE (15*HZ)                    /* Time to wait before retransmitting */
  86                                                 /* page regardless of infobits */
  87 typedef struct {
  88         u8 pgbuf[VTX_VIRTUALSIZE];              /* Page-buffer */
  89         u8 laststat[10];                        /* Last value of infobits for DAU */
  90         u8 sregs[7];                            /* Page-request registers */
  91         unsigned long expire;                   /* Time when page will be expired */
  92         unsigned clrfound : 1;                  /* VTXIOCCLRFOUND has been called */
  93         unsigned stopped : 1;                   /* VTXIOCSTOPDAU has been called */
  94 } vdau_t;
  95
  96 struct saa5249_device
  97 {
  98         vdau_t vdau[NUM_DAUS];                  /* Data for virtual DAUs (the 5249 only has one */
  99                                                 /* real DAU, so we have to simulate some more) */
 100         int vtx_use_count;
 101         int is_searching[NUM_DAUS];
 102         int disp_mode;
 103         int virtual_mode;
 104         struct i2c_client *client;
 105         struct semaphore lock;
 106 };
 107
 108
 109 #define CCTWR 34                /* I²C write/read-address of vtx-chip */
 110 #define CCTRD 35
 111 #define NOACK_REPEAT 10         /* Retry access this many times on failure */
 112 #define CLEAR_DELAY (HZ/20)     /* Time required to clear a page */
 113 #define READY_TIMEOUT (30*HZ/1000)      /* Time to wait for ready signal of I²C-bus interface */
 114 #define INIT_DELAY 500          /* Time in usec to wait at initialization of CEA interface */
 115 #define START_DELAY 10          /* Time in usec to wait before starting write-cycle (CEA) */
 116
 117 #define VTX_DEV_MINOR 0
 118
 119 /* General defines and debugging support */
 120
 121 #ifndef FALSE
 122 #define FALSE 0
 123 #define TRUE 1
 124 #endif
 125
 126 #define RESCHED do { cond_resched(); } while(0)
 127
 128 static struct video_device saa_template;        /* Declared near bottom */
 129
 130 /* Addresses to scan */
 131 static unsigned short normal_i2c[] = {34>>1,I2C_CLIENT_END};
 132 static unsigned short normal_i2c_range[] = {I2C_CLIENT_END};
 133 static unsigned short probe[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
 134 static unsigned short probe_range[2]  = { I2C_CLIENT_END, I2C_CLIENT_END };
 135 static unsigned short ignore[2]       = { I2C_CLIENT_END, I2C_CLIENT_END };
 136 static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
 137 static unsigned short force[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
 138
 139 static struct i2c_client_address_data addr_data = {
 140         normal_i2c, normal_i2c_range,
 141         probe, probe_range,
 142         ignore, ignore_range,
 143         force
 144 };
 145
 146 static struct i2c_client client_template;
 147
 148 static int saa5249_attach(struct i2c_adapter *adap, int addr, int kind)
 149 {
 150         int pgbuf;
 151         int err;
 152         struct i2c_client *client;
 153         struct video_device *vd;
 154         struct saa5249_device *t;
 155
 156         printk(KERN_INFO "saa5249: teletext chip found.\n");
 157         client=kmalloc(sizeof(*client), GFP_KERNEL);
 158         if(client==NULL)
 159                 return -ENOMEM;
 160         client_template.adapter = adap;
 161         client_template.addr = addr;
 162         memcpy(client, &client_template, sizeof(*client));
 163         t = kmalloc(sizeof(*t), GFP_KERNEL);
 164         if(t==NULL)
 165         {
 166                 kfree(client);
 167                 return -ENOMEM;
 168         }
 169         memset(t, 0, sizeof(*t));
 170         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
 171         init_MUTEX(&t->lock);
 172
 173         /*
 174          *      Now create a video4linux device
 175          */
 176
 177         vd = (struct video_device *)kmalloc(sizeof(struct video_device), GFP_KERNEL);
 178         if(vd==NULL)
 179         {
 180                 kfree(t);
 181                 kfree(client);
 182                 return -ENOMEM;
 183         }
 184         i2c_set_clientdata(client, vd);
 185         memcpy(vd, &saa_template, sizeof(*vd));
 186
 187         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 188         {
 189                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 190                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 191                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 192                 t->vdau[pgbuf].expire = 0;
 193                 t->vdau[pgbuf].clrfound = TRUE;
 194                 t->vdau[pgbuf].stopped = TRUE;
 195                 t->is_searching[pgbuf] = FALSE;
 196         }
 197         vd->priv=t;
 198
 199
 200         /*
 201          *      Register it
 202          */
 203
 204         if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
 205         {
 206                 kfree(t);
 207                 kfree(vd);
 208                 kfree(client);
 209                 return err;
 210         }
 211         t->client = client;
 212         i2c_attach_client(client);
 213         return 0;
 214 }
 215
 216 /*
 217  *      We do most of the hard work when we become a device on the i2c.
 218  */
 219
 220 static int saa5249_probe(struct i2c_adapter *adap)
 221 {
 222         if (adap->class & I2C_CLASS_TV_ANALOG)
 223                 return i2c_probe(adap, &addr_data, saa5249_attach);
 224         return 0;
 225 }
 226
 227 static int saa5249_detach(struct i2c_client *client)
 228 {
 229         struct video_device *vd = i2c_get_clientdata(client);
 230         i2c_detach_client(client);
 231         video_unregister_device(vd);
 232         kfree(vd->priv);
 233         kfree(vd);
 234         kfree(client);
 235         return 0;
 236 }
 237
 238 static int saa5249_command(struct i2c_client *device,
 239                              unsigned int cmd, void *arg)
 240 {
 241         return -EINVAL;
 242 }
 243
 244 /* new I2C driver support */
 245
 246 static struct i2c_driver i2c_driver_videotext =
 247 {
 248         .owner          = THIS_MODULE,
 249         .name           = IF_NAME,              /* name */
 250         .id             = I2C_DRIVERID_SAA5249, /* in i2c.h */
 251         .flags          = I2C_DF_NOTIFY,
 252         .attach_adapter = saa5249_probe,
 253         .detach_client  = saa5249_detach,
 254         .command        = saa5249_command
 255 };
 256
 257 static struct i2c_client client_template = {
 258         .id             = -1,
 259         .driver         = &i2c_driver_videotext,
 260         .name           = "(unset)",
 261 };
 262
 263 /*
 264  *      Wait the given number of jiffies (10ms). This calls the scheduler, so the actual
 265  *      delay may be longer.
 266  */
 267
 268 static void jdelay(unsigned long delay)
 269 {
 270         sigset_t oldblocked = current->blocked;
 271
 272         spin_lock_irq(&current->sighand->siglock);
 273         sigfillset(&current->blocked);
 274         recalc_sigpending();
 275         spin_unlock_irq(&current->sighand->siglock);
 276         current->state = TASK_INTERRUPTIBLE;
 277         schedule_timeout(delay);
 278
 279         spin_lock_irq(&current->sighand->siglock);
 280         current->blocked = oldblocked;
 281         recalc_sigpending();
 282         spin_unlock_irq(&current->sighand->siglock);
 283 }
 284
 285
 286 /*
 287  *      I2C interfaces
 288  */
 289
 290 static int i2c_sendbuf(struct saa5249_device *t, int reg, int count, u8 *data)
 291 {
 292         char buf[64];
 293
 294         buf[0] = reg;
 295         memcpy(buf+1, data, count);
 296
 297         if(i2c_master_send(t->client, buf, count+1)==count+1)
 298                 return 0;
 299         return -1;
 300 }
 301
 302 static int i2c_senddata(struct saa5249_device *t, ...)
 303 {
 304         unsigned char buf[64];
 305         int v;
 306         int ct=0;
 307         va_list argp;
 308         va_start(argp,t);
 309
 310         while((v=va_arg(argp,int))!=-1)
 311                 buf[ct++]=v;
 312         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 313 }
 314
 315 /* Get count number of bytes from I²C-device at address adr, store them in buf. Start & stop
 316  * handshaking is done by this routine, ack will be sent after the last byte to inhibit further
 317  * sending of data. If uaccess is TRUE, data is written to user-space with put_user.
 318  * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise
 319  */
 320
 321 static int i2c_getdata(struct saa5249_device *t, int count, u8 *buf)
 322 {
 323         if(i2c_master_recv(t->client, buf, count)!=count)
 324                 return -1;
 325         return 0;
 326 }
 327
 328
 329 /*
 330  *      Standard character-device-driver functions
 331  */
 332
 333 static int do_saa5249_ioctl(struct inode *inode, struct file *file,
 334                             unsigned int cmd, void *arg)
 335 {
 336         static int virtual_mode = FALSE;
 337         struct video_device *vd = video_devdata(file);
 338         struct saa5249_device *t=vd->priv;
 339
 340         switch(cmd)
 341         {
 342                 case VTXIOCGETINFO:
 343                 {
 344                         vtx_info_t *info = arg;
 345                         info->version_major = VTX_VER_MAJ;
 346                         info->version_minor = VTX_VER_MIN;
 347                         info->numpages = NUM_DAUS;
 348                         /*info->cct_type = CCT_TYPE;*/
 349                         return 0;
 350                 }
 351
 352                 case VTXIOCCLRPAGE:
 353                 {
 354                         vtx_pagereq_t *req = arg;
 355
 356                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 357                                 return -EINVAL;
 358                         memset(t->vdau[req->pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 359                         t->vdau[req->pgbuf].clrfound = TRUE;
 360                         return 0;
 361                 }
 362
 363                 case VTXIOCCLRFOUND:
 364                 {
 365                         vtx_pagereq_t *req = arg;
 366
 367                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 368                                 return -EINVAL;
 369                         t->vdau[req->pgbuf].clrfound = TRUE;
 370                         return 0;
 371                 }
 372
 373                 case VTXIOCPAGEREQ:
 374                 {
 375                         vtx_pagereq_t *req = arg;
 376                         if (!(req->pagemask & PGMASK_PAGE))
 377                                 req->page = 0;
 378                         if (!(req->pagemask & PGMASK_HOUR))
 379                                 req->hour = 0;
 380                         if (!(req->pagemask & PGMASK_MINUTE))
 381                                 req->minute = 0;
 382                         if (req->page < 0 || req->page > 0x8ff) /* 7FF ?? */
 383                                 return -EINVAL;
 384                         req->page &= 0x7ff;
 385                         if (req->hour < 0 || req->hour > 0x3f || req->minute < 0 || req->minute > 0x7f ||
 386                                 req->pagemask < 0 || req->pagemask >= PGMASK_MAX || req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 387                                 return -EINVAL;
 388                         t->vdau[req->pgbuf].sregs[0] = (req->pagemask & PG_HUND ? 0x10 : 0) | (req->page / 0x100);
 389                         t->vdau[req->pgbuf].sregs[1] = (req->pagemask & PG_TEN ? 0x10 : 0) | ((req->page / 0x10) & 0xf);
 390                         t->vdau[req->pgbuf].sregs[2] = (req->pagemask & PG_UNIT ? 0x10 : 0) | (req->page & 0xf);
 391                         t->vdau[req->pgbuf].sregs[3] = (req->pagemask & HR_TEN ? 0x10 : 0) | (req->hour / 0x10);
 392                         t->vdau[req->pgbuf].sregs[4] = (req->pagemask & HR_UNIT ? 0x10 : 0) | (req->hour & 0xf);
 393                         t->vdau[req->pgbuf].sregs[5] = (req->pagemask & MIN_TEN ? 0x10 : 0) | (req->minute / 0x10);
 394                         t->vdau[req->pgbuf].sregs[6] = (req->pagemask & MIN_UNIT ? 0x10 : 0) | (req->minute & 0xf);
 395                         t->vdau[req->pgbuf].stopped = FALSE;
 396                         t->vdau[req->pgbuf].clrfound = TRUE;
 397                         t->is_searching[req->pgbuf] = TRUE;
 398                         return 0;
 399                 }
 400
 401                 case VTXIOCGETSTAT:
 402                 {
 403                         vtx_pagereq_t *req = arg;
 404                         u8 infobits[10];
 405                         vtx_pageinfo_t info;
 406                         int a;
 407
 408                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 409                                 return -EINVAL;
 410                         if (!t->vdau[req->pgbuf].stopped)
 411                         {
 412                                 if (i2c_senddata(t, 2, 0, -1) ||
 413                                         i2c_sendbuf(t, 3, sizeof(t->vdau[0].sregs), t->vdau[req->pgbuf].sregs) ||
 414                                         i2c_senddata(t, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) ||
 415                                         i2c_senddata(t, 2, 0, t->vdau[req->pgbuf].sregs[0] | 8, -1) ||
 416                                         i2c_senddata(t, 8, 0, 25, 0, -1))
 417                                         return -EIO;
 418                                 jdelay(PAGE_WAIT);
 419                                 if (i2c_getdata(t, 10, infobits))
 420                                         return -EIO;
 421
 422                                 if (!(infobits[8] & 0x10) && !(infobits[7] & 0xf0) &&   /* check FOUND-bit */
 423                                         (memcmp(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits)) ||
 424                                         time_after_eq(jiffies, t->vdau[req->pgbuf].expire)))
 425                                 {               /* check if new page arrived */
 426                                         if (i2c_senddata(t, 8, 0, 0, 0, -1) ||
 427                                                 i2c_getdata(t, VTX_PAGESIZE, t->vdau[req->pgbuf].pgbuf))
 428                                                 return -EIO;
 429                                         t->vdau[req->pgbuf].expire = jiffies + PGBUF_EXPIRE;
 430                                         memset(t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE, ' ', VTX_VIRTUALSIZE - VTX_PAGESIZE);
 431                                         if (t->virtual_mode)
 432                                         {
 433                                                 /* Packet X/24 */
 434                                                 if (i2c_senddata(t, 8, 0, 0x20, 0, -1) ||
 435                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40))
 436                                                         return -EIO;
 437                                                 /* Packet X/27/0 */
 438                                                 if (i2c_senddata(t, 8, 0, 0x21, 0, -1) ||
 439                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40))
 440                                                         return -EIO;
 441                                                 /* Packet 8/30/0...8/30/15
 442                                                  * FIXME: AFAIK, the 5249 does hamming-decoding for some bytes in packet 8/30,
 443                                                  *        so we should undo this here.
 444                                                  */
 445                                                 if (i2c_senddata(t, 8, 0, 0x22, 0, -1) ||
 446                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40))
 447                                                         return -EIO;
 448                                         }
 449                                         t->vdau[req->pgbuf].clrfound = FALSE;
 450                                         memcpy(t->vdau[req->pgbuf].laststat, infobits, sizeof(infobits));
 451                                 }
 452                                 else
 453                                 {
 454                                         memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
 455                                 }
 456                         }
 457                         else
 458                         {
 459                                 memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
 460                         }
 461
 462                         info.pagenum = ((infobits[8] << 8) & 0x700) | ((infobits[1] << 4) & 0xf0) | (infobits[0] & 0x0f);
 463                         if (info.pagenum < 0x100)
 464                                 info.pagenum += 0x800;
 465                         info.hour = ((infobits[5] << 4) & 0x30) | (infobits[4] & 0x0f);
 466                         info.minute = ((infobits[3] << 4) & 0x70) | (infobits[2] & 0x0f);
 467                         info.charset = ((infobits[7] >> 1) & 7);
 468                         info.delete = !!(infobits[3] & 8);
 469                         info.headline = !!(infobits[5] & 4);
 470                         info.subtitle = !!(infobits[5] & 8);
 471                         info.supp_header = !!(infobits[6] & 1);
 472                         info.update = !!(infobits[6] & 2);
 473                         info.inter_seq = !!(infobits[6] & 4);
 474                         info.dis_disp = !!(infobits[6] & 8);
 475                         info.serial = !!(infobits[7] & 1);
 476                         info.notfound = !!(infobits[8] & 0x10);
 477                         info.pblf = !!(infobits[9] & 0x20);
 478                         info.hamming = 0;
 479                         for (a = 0; a <= 7; a++)
 480                         {
 481                                 if (infobits[a] & 0xf0)
 482                                 {
 483                                         info.hamming = 1;
 484                                         break;
 485                                 }
 486                         }
 487                         if (t->vdau[req->pgbuf].clrfound)
 488                                 info.notfound = 1;
 489                         if(copy_to_user(req->buffer, &info, sizeof(vtx_pageinfo_t)))
 490                                 return -EFAULT;
 491                         if (!info.hamming && !info.notfound)
 492                         {
 493                                 t->is_searching[req->pgbuf] = FALSE;
 494                         }
 495                         return 0;
 496                 }
 497
 498                 case VTXIOCGETPAGE:
 499                 {
 500                         vtx_pagereq_t *req = arg;
 501                         int start, end;
 502
 503                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || req->start < 0 ||
 504                                 req->start > req->end || req->end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE))
 505                                 return -EINVAL;
 506                         if(copy_to_user(req->buffer, &t->vdau[req->pgbuf].pgbuf[req->start], req->end - req->start + 1))
 507                                 return -EFAULT;
 508
 509                          /*
 510                           *     Always read the time directly from SAA5249
 511                           */
 512
 513                         if (req->start <= 39 && req->end >= 32)
 514                         {
 515                                 int len;
 516                                 char buf[16];
 517                                 start = max(req->start, 32);
 518                                 end = min(req->end, 39);
 519                                 len=end-start+1;
 520                                 if (i2c_senddata(t, 8, 0, 0, start, -1) ||
 521                                         i2c_getdata(t, len, buf))
 522                                         return -EIO;
 523                                 if(copy_to_user(req->buffer+start-req->start, buf, len))
 524                                         return -EFAULT;
 525                         }
 526                         /* Insert the current header if DAU is still searching for a page */
 527                         if (req->start <= 31 && req->end >= 7 && t->is_searching[req->pgbuf])
 528                         {
 529                                 char buf[32];
 530                                 int len;
 531                                 start = max(req->start, 7);
 532                                 end = min(req->end, 31);
 533                                 len=end-start+1;
 534                                 if (i2c_senddata(t, 8, 0, 0, start, -1) ||
 535                                         i2c_getdata(t, len, buf))
 536                                         return -EIO;
 537                                 if(copy_to_user(req->buffer+start-req->start, buf, len))
 538                                         return -EFAULT;
 539                         }
 540                         return 0;
 541                 }
 542
 543                 case VTXIOCSTOPDAU:
 544                 {
 545                         vtx_pagereq_t *req = arg;
 546
 547                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 548                                 return -EINVAL;
 549                         t->vdau[req->pgbuf].stopped = TRUE;
 550                         t->is_searching[req->pgbuf] = FALSE;
 551                         return 0;
 552                 }
 553
 554                 case VTXIOCPUTPAGE:
 555                 case VTXIOCSETDISP:
 556                 case VTXIOCPUTSTAT:
 557                         return 0;
 558
 559                 case VTXIOCCLRCACHE:
 560                 {
 561                         if (i2c_senddata(t, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, 11,
 562                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
 563                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', -1))
 564                                 return -EIO;
 565                         if (i2c_senddata(t, 3, 0x20, -1))
 566                                 return -EIO;
 567                         jdelay(10 * CLEAR_DELAY);                       /* I have no idea how long we have to wait here */
 568                         return 0;
 569                 }
 570
 571                 case VTXIOCSETVIRT:
 572                 {
 573                         /* The SAA5249 has virtual-row reception turned on always */
 574                         t->virtual_mode = (int)(long)arg;
 575                         return 0;
 576                 }
 577         }
 578         return -EINVAL;
 579 }
 580
 581 /*
 582  *      Handle the locking
 583  */
 584
 585 static int saa5249_ioctl(struct inode *inode, struct file *file,
 586                          unsigned int cmd, unsigned long arg)
 587 {
 588         struct video_device *vd = video_devdata(file);
 589         struct saa5249_device *t=vd->priv;
 590         int err;
 591
 592         down(&t->lock);
 593         err = video_usercopy(inode,file,cmd,arg,do_saa5249_ioctl);
 594         up(&t->lock);
 595         return err;
 596 }
 597
 598 static int saa5249_open(struct inode *inode, struct file *file)
 599 {
 600         struct video_device *vd = video_devdata(file);
 601         struct saa5249_device *t=vd->priv;
 602         int err,pgbuf;
 603
 604         err = video_exclusive_open(inode,file);
 605         if (err < 0)
 606                 return err;
 607
 608         if (t->client==NULL) {
 609                 err = -ENODEV;
 610                 goto fail;
 611         }
 612
 613         if (i2c_senddata(t, 0, 0, -1) ||                /* Select R11 */
 614                                                 /* Turn off parity checks (we do this ourselves) */
 615                 i2c_senddata(t, 1, disp_modes[t->disp_mode][0], 0, -1) ||
 616                                                 /* Display TV-picture, no virtual rows */
 617                 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 */
 618
 619         {
 620                 err = -EIO;
 621                 goto fail;
 622         }
 623
 624         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 625         {
 626                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 627                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 628                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 629                 t->vdau[pgbuf].expire = 0;
 630                 t->vdau[pgbuf].clrfound = TRUE;
 631                 t->vdau[pgbuf].stopped = TRUE;
 632                 t->is_searching[pgbuf] = FALSE;
 633         }
 634         t->virtual_mode=FALSE;
 635         return 0;
 636
 637  fail:
 638         video_exclusive_release(inode,file);
 639         return err;
 640 }
 641
 642
 643
 644 static int saa5249_release(struct inode *inode, struct file *file)
 645 {
 646         struct video_device *vd = video_devdata(file);
 647         struct saa5249_device *t=vd->priv;
 648         i2c_senddata(t, 1, 0x20, -1);           /* Turn off CCT */
 649         i2c_senddata(t, 5, 3, 3, -1);           /* Turn off TV-display */
 650         video_exclusive_release(inode,file);
 651         return 0;
 652 }
 653
 654 static int __init init_saa_5249 (void)
 655 {
 656         printk(KERN_INFO "SAA5249 driver (" IF_NAME " interface) for VideoText version %d.%d\n",
 657                         VTX_VER_MAJ, VTX_VER_MIN);
 658         return i2c_add_driver(&i2c_driver_videotext);
 659 }
 660
 661 static void __exit cleanup_saa_5249 (void)
 662 {
 663         i2c_del_driver(&i2c_driver_videotext);
 664 }
 665
 666 module_init(init_saa_5249);
 667 module_exit(cleanup_saa_5249);
 668
 669 static struct file_operations saa_fops = {
 670         .owner          = THIS_MODULE,
 671         .open           = saa5249_open,
 672         .release        = saa5249_release,
 673         .ioctl          = saa5249_ioctl,
 674         .llseek         = no_llseek,
 675 };
 676
 677 static struct video_device saa_template =
 678 {
 679         .owner          = THIS_MODULE,
 680         .name           = IF_NAME,
 681         .type           = VID_TYPE_TELETEXT,    /*| VID_TYPE_TUNER ?? */
 682         .hardware       = VID_HARDWARE_SAA5249,
 683         .fops           = &saa_fops,
 684 };
 685
 686 MODULE_LICENSE("GPL");