drivers/media/video/saa5246a.c

   1 /*
   2  * Driver for the SAA5246A or SAA5281 Teletext (=Videotext) decoder chips from
   3  * Philips.
   4  *
   5  * Only capturing of Teletext pages is tested. The videotext chips also have a
   6  * TV output but my hardware doesn't use it. For this reason this driver does
   7  * not support changing any TV display settings.
   8  *
   9  * Copyright (C) 2004 Michael Geng <linux@MichaelGeng.de>
  10  *
  11  * Derived from
  12  *
  13  * saa5249 driver
  14  * Copyright (C) 1998 Richard Guenther
  15  * <richard.guenther@student.uni-tuebingen.de>
  16  *
  17  * with changes by
  18  * Alan Cox <Alan.Cox@linux.org>
  19  *
  20  * and
  21  *
  22  * vtx.c
  23  * Copyright (C) 1994-97 Martin Buck  <martin-2.buck@student.uni-ulm.de>
  24  *
  25  * This program is free software; you can redistribute it and/or modify
  26  * it under the terms of the GNU General Public License as published by
  27  * the Free Software Foundation; either version 2 of the License, or
  28  * (at your option) any later version.
  29  *
  30  * This program is distributed in the hope that it will be useful,
  31  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  * GNU General Public License for more details.
  34  *
  35  * You should have received a copy of the GNU General Public License
  36  * along with this program; if not, write to the Free Software
  37  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  38  * USA.
  39  */
  40
  41 #include <linux/module.h>
  42 #include <linux/kernel.h>
  43 #include <linux/sched.h>
  44 #include <linux/mm.h>
  45 #include <linux/init.h>
  46 #include <linux/i2c.h>
  47 #include <linux/videotext.h>
  48 #include <linux/videodev.h>
  49 #include "saa5246a.h"
  50
  51 MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
  52 MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver");
  53 MODULE_LICENSE("GPL");
  54
  55 struct saa5246a_device
  56 {
  57         u8     pgbuf[NUM_DAUS][VTX_VIRTUALSIZE];
  58         int    is_searching[NUM_DAUS];
  59         struct i2c_client *client;
  60         struct semaphore lock;
  61 };
  62
  63 static struct video_device saa_template;        /* Declared near bottom */
  64
  65 /* Addresses to scan */
  66 static unsigned short normal_i2c[]       = { I2C_ADDRESS, I2C_CLIENT_END };
  67 static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };
  68 static unsigned short probe[2]           = { I2C_CLIENT_END, I2C_CLIENT_END };
  69 static unsigned short probe_range[2]     = { I2C_CLIENT_END, I2C_CLIENT_END };
  70 static unsigned short ignore[2]          = { I2C_CLIENT_END, I2C_CLIENT_END };
  71 static unsigned short ignore_range[2]    = { I2C_CLIENT_END, I2C_CLIENT_END };
  72 static unsigned short force[2]           = { I2C_CLIENT_END, I2C_CLIENT_END };
  73
  74 static struct i2c_client_address_data addr_data = {
  75         normal_i2c, normal_i2c_range,
  76         probe, probe_range,
  77         ignore, ignore_range,
  78         force
  79 };
  80
  81 static struct i2c_client client_template;
  82
  83 static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind)
  84 {
  85         int pgbuf;
  86         int err;
  87         struct i2c_client *client;
  88         struct video_device *vd;
  89         struct saa5246a_device *t;
  90
  91         printk(KERN_INFO "saa5246a: teletext chip found.\n");
  92         client=kmalloc(sizeof(*client), GFP_KERNEL);
  93         if(client==NULL)
  94                 return -ENOMEM;
  95         client_template.adapter = adap;
  96         client_template.addr = addr;
  97         memcpy(client, &client_template, sizeof(*client));
  98         t = kmalloc(sizeof(*t), GFP_KERNEL);
  99         if(t==NULL)
 100         {
 101                 kfree(client);
 102                 return -ENOMEM;
 103         }
 104         memset(t, 0, sizeof(*t));
 105         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
 106         init_MUTEX(&t->lock);
 107
 108         /*
 109          *      Now create a video4linux device
 110          */
 111
 112         vd = video_device_alloc();
 113         if(vd==NULL)
 114         {
 115                 kfree(t);
 116                 kfree(client);
 117                 return -ENOMEM;
 118         }
 119         i2c_set_clientdata(client, vd);
 120         memcpy(vd, &saa_template, sizeof(*vd));
 121
 122         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 123         {
 124                 memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
 125                 t->is_searching[pgbuf] = FALSE;
 126         }
 127         vd->priv=t;
 128
 129
 130         /*
 131          *      Register it
 132          */
 133
 134         if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
 135         {
 136                 kfree(t);
 137                 kfree(client);
 138                 video_device_release(vd);
 139                 return err;
 140         }
 141         t->client = client;
 142         i2c_attach_client(client);
 143         return 0;
 144 }
 145
 146 /*
 147  *      We do most of the hard work when we become a device on the i2c.
 148  */
 149 static int saa5246a_probe(struct i2c_adapter *adap)
 150 {
 151         if (adap->class & I2C_CLASS_TV_ANALOG)
 152                 return i2c_probe(adap, &addr_data, saa5246a_attach);
 153         return 0;
 154 }
 155
 156 static int saa5246a_detach(struct i2c_client *client)
 157 {
 158         struct video_device *vd = i2c_get_clientdata(client);
 159         i2c_detach_client(client);
 160         video_unregister_device(vd);
 161         kfree(vd->priv);
 162         kfree(client);
 163         return 0;
 164 }
 165
 166 static int saa5246a_command(struct i2c_client *device, unsigned int cmd,
 167         void *arg)
 168 {
 169         return -EINVAL;
 170 }
 171
 172 /*
 173  *      I2C interfaces
 174  */
 175
 176 static struct i2c_driver i2c_driver_videotext =
 177 {
 178         .owner          = THIS_MODULE,
 179         .name           = IF_NAME,              /* name */
 180         .id             = I2C_DRIVERID_SAA5249, /* in i2c.h */
 181         .flags          = I2C_DF_NOTIFY,
 182         .attach_adapter = saa5246a_probe,
 183         .detach_client  = saa5246a_detach,
 184         .command        = saa5246a_command
 185 };
 186
 187 static struct i2c_client client_template = {
 188         .id             = -1,
 189         .driver         = &i2c_driver_videotext,
 190         .name           = "(unset)",
 191 };
 192
 193 static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
 194 {
 195         char buf[64];
 196
 197         buf[0] = reg;
 198         memcpy(buf+1, data, count);
 199
 200         if(i2c_master_send(t->client, buf, count+1)==count+1)
 201                 return 0;
 202         return -1;
 203 }
 204
 205 static int i2c_senddata(struct saa5246a_device *t, ...)
 206 {
 207         unsigned char buf[64];
 208         int v;
 209         int ct=0;
 210         va_list argp;
 211         va_start(argp,t);
 212
 213         while((v=va_arg(argp,int))!=-1)
 214                 buf[ct++]=v;
 215         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 216 }
 217
 218 /* Get count number of bytes from I²C-device at address adr, store them in buf.
 219  * Start & stop handshaking is done by this routine, ack will be sent after the
 220  * last byte to inhibit further sending of data. If uaccess is TRUE, data is
 221  * written to user-space with put_user. Returns -1 if I²C-device didn't send
 222  * acknowledge, 0 otherwise
 223  */
 224 static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
 225 {
 226         if(i2c_master_recv(t->client, buf, count)!=count)
 227                 return -1;
 228         return 0;
 229 }
 230
 231 /* When a page is found then the not FOUND bit in one of the status registers
 232  * of the SAA5264A chip is cleared. Unfortunately this bit is not set
 233  * automatically when a new page is requested. Instead this function must be
 234  * called after a page has been requested.
 235  *
 236  * Return value: 0 if successful
 237  */
 238 static int saa5246a_clear_found_bit(struct saa5246a_device *t,
 239         unsigned char dau_no)
 240 {
 241         unsigned char row_25_column_8;
 242
 243         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 244
 245                 dau_no |
 246                 R8_DO_NOT_CLEAR_MEMORY,
 247
 248                 R9_CURSER_ROW_25,
 249
 250                 R10_CURSER_COLUMN_8,
 251
 252                 COMMAND_END) ||
 253                 i2c_getdata(t, 1, &row_25_column_8))
 254         {
 255                 return -EIO;
 256         }
 257         row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
 258         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 259
 260                 dau_no |
 261                 R8_DO_NOT_CLEAR_MEMORY,
 262
 263                 R9_CURSER_ROW_25,
 264
 265                 R10_CURSER_COLUMN_8,
 266
 267                 row_25_column_8,
 268
 269                 COMMAND_END))
 270         {
 271                 return -EIO;
 272         }
 273
 274         return 0;
 275 }
 276
 277 /* Requests one videotext page as described in req. The fields of req are
 278  * checked and an error is returned if something is invalid.
 279  *
 280  * Return value: 0 if successful
 281  */
 282 static int saa5246a_request_page(struct saa5246a_device *t,
 283     vtx_pagereq_t *req)
 284 {
 285         if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
 286                 return -EINVAL;
 287         if (req->pagemask & PGMASK_PAGE)
 288                 if (req->page < 0 || req->page > PAGE_MAX)
 289                         return -EINVAL;
 290         if (req->pagemask & PGMASK_HOUR)
 291                 if (req->hour < 0 || req->hour > HOUR_MAX)
 292                         return -EINVAL;
 293         if (req->pagemask & PGMASK_MINUTE)
 294                 if (req->minute < 0 || req->minute > MINUTE_MAX)
 295                         return -EINVAL;
 296         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 297                 return -EINVAL;
 298
 299         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 300
 301                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 302                 req->pgbuf << 4 |
 303                 R2_BANK_0 |
 304                 R2_HAMMING_CHECK_OFF,
 305
 306                 HUNDREDS_OF_PAGE(req->page) |
 307                 R3_HOLD_PAGE |
 308                 (req->pagemask & PG_HUND ?
 309                         R3_PAGE_HUNDREDS_DO_CARE :
 310                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 311
 312                 TENS_OF_PAGE(req->page) |
 313                 (req->pagemask & PG_TEN ?
 314                         R3_PAGE_TENS_DO_CARE :
 315                         R3_PAGE_TENS_DO_NOT_CARE),
 316
 317                 UNITS_OF_PAGE(req->page) |
 318                 (req->pagemask & PG_UNIT ?
 319                         R3_PAGE_UNITS_DO_CARE :
 320                         R3_PAGE_UNITS_DO_NOT_CARE),
 321
 322                 TENS_OF_HOUR(req->hour) |
 323                 (req->pagemask & HR_TEN ?
 324                         R3_HOURS_TENS_DO_CARE :
 325                         R3_HOURS_TENS_DO_NOT_CARE),
 326
 327                 UNITS_OF_HOUR(req->hour) |
 328                 (req->pagemask & HR_UNIT ?
 329                         R3_HOURS_UNITS_DO_CARE :
 330                         R3_HOURS_UNITS_DO_NOT_CARE),
 331
 332                 TENS_OF_MINUTE(req->minute) |
 333                 (req->pagemask & MIN_TEN ?
 334                         R3_MINUTES_TENS_DO_CARE :
 335                         R3_MINUTES_TENS_DO_NOT_CARE),
 336
 337                 UNITS_OF_MINUTE(req->minute) |
 338                 (req->pagemask & MIN_UNIT ?
 339                         R3_MINUTES_UNITS_DO_CARE :
 340                         R3_MINUTES_UNITS_DO_NOT_CARE),
 341
 342                 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
 343
 344                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 345                 req->pgbuf << 4 |
 346                 R2_BANK_0 |
 347                 R2_HAMMING_CHECK_OFF,
 348
 349                 HUNDREDS_OF_PAGE(req->page) |
 350                 R3_UPDATE_PAGE |
 351                 (req->pagemask & PG_HUND ?
 352                         R3_PAGE_HUNDREDS_DO_CARE :
 353                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 354
 355                 COMMAND_END))
 356         {
 357                 return -EIO;
 358         }
 359
 360         t->is_searching[req->pgbuf] = TRUE;
 361         return 0;
 362 }
 363
 364 /* This routine decodes the page number from the infobits contained in line 25.
 365  *
 366  * Parameters:
 367  * infobits: must be bits 0 to 9 of column 25
 368  *
 369  * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
 370  */
 371 static inline int saa5246a_extract_pagenum_from_infobits(
 372     unsigned char infobits[10])
 373 {
 374         int page_hundreds, page_tens, page_units;
 375
 376         page_units    = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
 377         page_tens     = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
 378         page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
 379
 380         /* page 0x.. means page 8.. */
 381         if (page_hundreds == 0)
 382                 page_hundreds = 8;
 383
 384         return((page_hundreds << 8) | (page_tens << 4) | page_units);
 385 }
 386
 387 /* Decodes the hour from the infobits contained in line 25.
 388  *
 389  * Parameters:
 390  * infobits: must be bits 0 to 9 of column 25
 391  *
 392  * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
 393  */
 394 static inline int saa5246a_extract_hour_from_infobits(
 395     unsigned char infobits[10])
 396 {
 397         int hour_tens, hour_units;
 398
 399         hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
 400         hour_tens  = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
 401
 402         return((hour_tens << 4) | hour_units);
 403 }
 404
 405 /* Decodes the minutes from the infobits contained in line 25.
 406  *
 407  * Parameters:
 408  * infobits: must be bits 0 to 9 of column 25
 409  *
 410  * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
 411  */
 412 static inline int saa5246a_extract_minutes_from_infobits(
 413     unsigned char infobits[10])
 414 {
 415         int minutes_tens, minutes_units;
 416
 417         minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
 418         minutes_tens  = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
 419
 420         return((minutes_tens << 4) | minutes_units);
 421 }
 422
 423 /* Reads the status bits contained in the first 10 columns of the first line
 424  * and extracts the information into info.
 425  *
 426  * Return value: 0 if successful
 427  */
 428 static inline int saa5246a_get_status(struct saa5246a_device *t,
 429     vtx_pageinfo_t *info, unsigned char dau_no)
 430 {
 431         unsigned char infobits[10];
 432         int column;
 433
 434         if (dau_no >= NUM_DAUS)
 435                 return -EINVAL;
 436
 437         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 438
 439                 dau_no |
 440                 R8_DO_NOT_CLEAR_MEMORY,
 441
 442                 R9_CURSER_ROW_25,
 443
 444                 R10_CURSER_COLUMN_0,
 445
 446                 COMMAND_END) ||
 447                 i2c_getdata(t, 10, infobits))
 448         {
 449                 return -EIO;
 450         }
 451
 452         info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
 453         info->hour    = saa5246a_extract_hour_from_infobits(infobits);
 454         info->minute  = saa5246a_extract_minutes_from_infobits(infobits);
 455         info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
 456         info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
 457         info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
 458         info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
 459         info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
 460         info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
 461         info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
 462         info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
 463         info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
 464         info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
 465         info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
 466         info->hamming = 0;
 467         for (column = 0; column <= 7; column++) {
 468                 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
 469                         info->hamming = 1;
 470                         break;
 471                 }
 472         }
 473         if (!info->hamming && !info->notfound)
 474                 t->is_searching[dau_no] = FALSE;
 475         return 0;
 476 }
 477
 478 /* Reads 1 videotext page buffer of the SAA5246A.
 479  *
 480  * req is used both as input and as output. It contains information which part
 481  * must be read. The videotext page is copied into req->buffer.
 482  *
 483  * Return value: 0 if successful
 484  */
 485 static inline int saa5246a_get_page(struct saa5246a_device *t,
 486         vtx_pagereq_t *req)
 487 {
 488         int start, end, size;
 489         char *buf;
 490         int err;
 491
 492         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
 493             req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
 494                 return -EINVAL;
 495
 496         buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
 497         if (!buf)
 498                 return -ENOMEM;
 499
 500         /* Read "normal" part of page */
 501         err = -EIO;
 502
 503         end = min(req->end, VTX_PAGESIZE - 1);
 504         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 505                         req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
 506                         ROW(req->start), COLUMN(req->start), COMMAND_END))
 507                 goto out;
 508         if (i2c_getdata(t, end - req->start + 1, buf))
 509                 goto out;
 510         err = -EFAULT;
 511         if (copy_to_user(req->buffer, buf, end - req->start + 1))
 512                 goto out;
 513
 514         /* Always get the time from buffer 4, since this stupid SAA5246A only
 515          * updates the currently displayed buffer...
 516          */
 517         if (REQ_CONTAINS_TIME(req)) {
 518                 start = max(req->start, POS_TIME_START);
 519                 end   = min(req->end,   POS_TIME_END);
 520                 size = end - start + 1;
 521                 err = -EINVAL;
 522                 if (size < 0)
 523                         goto out;
 524                 err = -EIO;
 525                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 526                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 527                                 R9_CURSER_ROW_0, start, COMMAND_END))
 528                         goto out;
 529                 if (i2c_getdata(t, size, buf))
 530                         goto out;
 531                 err = -EFAULT;
 532                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 533                         goto out;
 534         }
 535         /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
 536         if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
 537                 start = max(req->start, POS_HEADER_START);
 538                 end   = min(req->end,   POS_HEADER_END);
 539                 size = end - start + 1;
 540                 err = -EINVAL;
 541                 if (size < 0)
 542                         goto out;
 543                 err = -EIO;
 544                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 545                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 546                                 R9_CURSER_ROW_0, start, COMMAND_END))
 547                         goto out;
 548                 if (i2c_getdata(t, end - start + 1, buf))
 549                         goto out;
 550                 err = -EFAULT;
 551                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 552                         goto out;
 553         }
 554         err = 0;
 555 out:
 556         kfree(buf);
 557         return err;
 558 }
 559
 560 /* Stops the acquisition circuit given in dau_no. The page buffer associated
 561  * with this acquisition circuit will no more be updated. The other daus are
 562  * not affected.
 563  *
 564  * Return value: 0 if successful
 565  */
 566 static inline int saa5246a_stop_dau(struct saa5246a_device *t,
 567     unsigned char dau_no)
 568 {
 569         if (dau_no >= NUM_DAUS)
 570                 return -EINVAL;
 571         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 572
 573                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 574                 dau_no << 4 |
 575                 R2_BANK_0 |
 576                 R2_HAMMING_CHECK_OFF,
 577
 578                 R3_PAGE_HUNDREDS_0 |
 579                 R3_HOLD_PAGE |
 580                 R3_PAGE_HUNDREDS_DO_NOT_CARE,
 581
 582                 COMMAND_END))
 583         {
 584                 return -EIO;
 585         }
 586         t->is_searching[dau_no] = FALSE;
 587         return 0;
 588 }
 589
 590 /*  Handles ioctls defined in videotext.h
 591  *
 592  *  Returns 0 if successful
 593  */
 594 static int do_saa5246a_ioctl(struct inode *inode, struct file *file,
 595                             unsigned int cmd, void *arg)
 596 {
 597         struct video_device *vd = video_devdata(file);
 598         struct saa5246a_device *t=vd->priv;
 599         switch(cmd)
 600         {
 601                 case VTXIOCGETINFO:
 602                 {
 603                         vtx_info_t *info = arg;
 604
 605                         info->version_major = MAJOR_VERSION;
 606                         info->version_minor = MINOR_VERSION;
 607                         info->numpages = NUM_DAUS;
 608                         return 0;
 609                 }
 610
 611                 case VTXIOCCLRPAGE:
 612                 {
 613                         vtx_pagereq_t *req = arg;
 614
 615                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 616                                 return -EINVAL;
 617                         memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0]));
 618                         return 0;
 619                 }
 620
 621                 case VTXIOCCLRFOUND:
 622                 {
 623                         vtx_pagereq_t *req = arg;
 624
 625                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 626                                 return -EINVAL;
 627                         return(saa5246a_clear_found_bit(t, req->pgbuf));
 628                 }
 629
 630                 case VTXIOCPAGEREQ:
 631                 {
 632                         vtx_pagereq_t *req = arg;
 633
 634                         return(saa5246a_request_page(t, req));
 635                 }
 636
 637                 case VTXIOCGETSTAT:
 638                 {
 639                         vtx_pagereq_t *req = arg;
 640                         vtx_pageinfo_t info;
 641                         int rval;
 642
 643                         if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
 644                                 return rval;
 645                         if(copy_to_user(req->buffer, &info,
 646                                 sizeof(vtx_pageinfo_t)))
 647                                 return -EFAULT;
 648                         return 0;
 649                 }
 650
 651                 case VTXIOCGETPAGE:
 652                 {
 653                         vtx_pagereq_t *req = arg;
 654
 655                         return(saa5246a_get_page(t, req));
 656                 }
 657
 658                 case VTXIOCSTOPDAU:
 659                 {
 660                         vtx_pagereq_t *req = arg;
 661
 662                         return(saa5246a_stop_dau(t, req->pgbuf));
 663                 }
 664
 665                 case VTXIOCPUTPAGE:
 666                 case VTXIOCSETDISP:
 667                 case VTXIOCPUTSTAT:
 668                         return 0;
 669
 670                 case VTXIOCCLRCACHE:
 671                 {
 672                         return 0;
 673                 }
 674
 675                 case VTXIOCSETVIRT:
 676                 {
 677                         /* I do not know what "virtual mode" means */
 678                         return 0;
 679                 }
 680         }
 681         return -EINVAL;
 682 }
 683
 684 /*
 685  *      Handle the locking
 686  */
 687 static int saa5246a_ioctl(struct inode *inode, struct file *file,
 688                          unsigned int cmd, unsigned long arg)
 689 {
 690         struct video_device *vd = video_devdata(file);
 691         struct saa5246a_device *t = vd->priv;
 692         int err;
 693
 694         down(&t->lock);
 695         err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
 696         up(&t->lock);
 697         return err;
 698 }
 699
 700 static int saa5246a_open(struct inode *inode, struct file *file)
 701 {
 702         struct video_device *vd = video_devdata(file);
 703         struct saa5246a_device *t = vd->priv;
 704         int err;
 705
 706         err = video_exclusive_open(inode,file);
 707         if (err < 0)
 708                 return err;
 709
 710         if (t->client==NULL) {
 711                 err = -ENODEV;
 712                 goto fail;
 713         }
 714
 715         if (i2c_senddata(t, SAA5246A_REGISTER_R0,
 716
 717                 R0_SELECT_R11 |
 718                 R0_PLL_TIME_CONSTANT_LONG |
 719                 R0_ENABLE_nODD_EVEN_OUTPUT |
 720                 R0_ENABLE_HDR_POLL |
 721                 R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
 722                 R0_NO_FREE_RUN_PLL |
 723                 R0_NO_AUTOMATIC_FASTEXT_PROMPT,
 724
 725                 R1_NON_INTERLACED_312_312_LINES |
 726                 R1_DEW |
 727                 R1_EXTENDED_PACKET_DISABLE |
 728                 R1_DAUS_ALL_ON |
 729                 R1_8_BITS_NO_PARITY |
 730                 R1_VCS_TO_SCS,
 731
 732                 COMMAND_END) ||
 733                 i2c_senddata(t, SAA5246A_REGISTER_R4,
 734
 735                 /* We do not care much for the TV display but nevertheless we
 736                  * need the currently displayed page later because only on that
 737                  * page the time is updated. */
 738                 R4_DISPLAY_PAGE_4,
 739
 740                 COMMAND_END))
 741         {
 742                 err = -EIO;
 743                 goto fail;
 744         }
 745
 746         return 0;
 747
 748 fail:
 749         video_exclusive_release(inode,file);
 750         return err;
 751 }
 752
 753 static int saa5246a_release(struct inode *inode, struct file *file)
 754 {
 755         struct video_device *vd = video_devdata(file);
 756         struct saa5246a_device *t = vd->priv;
 757
 758         /* Stop all acquisition circuits. */
 759         i2c_senddata(t, SAA5246A_REGISTER_R1,
 760
 761                 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
 762                 R1_DEW |
 763                 R1_EXTENDED_PACKET_DISABLE |
 764                 R1_DAUS_ALL_OFF |
 765                 R1_8_BITS_NO_PARITY |
 766                 R1_VCS_TO_SCS,
 767
 768                 COMMAND_END);
 769         video_exclusive_release(inode,file);
 770         return 0;
 771 }
 772
 773 static int __init init_saa_5246a (void)
 774 {
 775         printk(KERN_INFO
 776                 "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
 777                 MAJOR_VERSION, MINOR_VERSION);
 778         return i2c_add_driver(&i2c_driver_videotext);
 779 }
 780
 781 static void __exit cleanup_saa_5246a (void)
 782 {
 783         i2c_del_driver(&i2c_driver_videotext);
 784 }
 785
 786 module_init(init_saa_5246a);
 787 module_exit(cleanup_saa_5246a);
 788
 789 static struct file_operations saa_fops = {
 790         .owner   = THIS_MODULE,
 791         .open    = saa5246a_open,
 792         .release = saa5246a_release,
 793         .ioctl   = saa5246a_ioctl,
 794         .llseek  = no_llseek,
 795 };
 796
 797 static struct video_device saa_template =
 798 {
 799         .owner    = THIS_MODULE,
 800         .name     = IF_NAME,
 801         .type     = VID_TYPE_TELETEXT,
 802         .hardware = VID_HARDWARE_SAA5249,
 803         .fops     = &saa_fops,
 804         .release  = video_device_release,
 805         .minor    = -1,
 806 };