drivers/media/video/saa5246a.c

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