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 <media/v4l2-common.h>
  50 #include <linux/mutex.h>
  51
  52 #include "saa5246a.h"
  53
  54 MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
  55 MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver");
  56 MODULE_LICENSE("GPL");
  57
  58 struct saa5246a_device
  59 {
  60         u8     pgbuf[NUM_DAUS][VTX_VIRTUALSIZE];
  61         int    is_searching[NUM_DAUS];
  62         struct i2c_client *client;
  63         struct mutex lock;
  64 };
  65
  66 static struct video_device saa_template;        /* Declared near bottom */
  67
  68 /* Addresses to scan */
  69 static unsigned short normal_i2c[]       = { I2C_ADDRESS, I2C_CLIENT_END };
  70 I2C_CLIENT_INSMOD;
  71
  72 static struct i2c_client client_template;
  73
  74 static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind)
  75 {
  76         int pgbuf;
  77         int err;
  78         struct i2c_client *client;
  79         struct video_device *vd;
  80         struct saa5246a_device *t;
  81
  82         printk(KERN_INFO "saa5246a: teletext chip found.\n");
  83         client=kmalloc(sizeof(*client), GFP_KERNEL);
  84         if(client==NULL)
  85                 return -ENOMEM;
  86         client_template.adapter = adap;
  87         client_template.addr = addr;
  88         memcpy(client, &client_template, sizeof(*client));
  89         t = kzalloc(sizeof(*t), GFP_KERNEL);
  90         if(t==NULL)
  91         {
  92                 kfree(client);
  93                 return -ENOMEM;
  94         }
  95         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
  96         mutex_init(&t->lock);
  97
  98         /*
  99          *      Now create a video4linux device
 100          */
 101
 102         vd = video_device_alloc();
 103         if(vd==NULL)
 104         {
 105                 kfree(t);
 106                 kfree(client);
 107                 return -ENOMEM;
 108         }
 109         i2c_set_clientdata(client, vd);
 110         memcpy(vd, &saa_template, sizeof(*vd));
 111
 112         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 113         {
 114                 memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
 115                 t->is_searching[pgbuf] = FALSE;
 116         }
 117         vd->priv=t;
 118
 119
 120         /*
 121          *      Register it
 122          */
 123
 124         if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
 125         {
 126                 kfree(t);
 127                 kfree(client);
 128                 video_device_release(vd);
 129                 return err;
 130         }
 131         t->client = client;
 132         i2c_attach_client(client);
 133         return 0;
 134 }
 135
 136 /*
 137  *      We do most of the hard work when we become a device on the i2c.
 138  */
 139 static int saa5246a_probe(struct i2c_adapter *adap)
 140 {
 141         if (adap->class & I2C_CLASS_TV_ANALOG)
 142                 return i2c_probe(adap, &addr_data, saa5246a_attach);
 143         return 0;
 144 }
 145
 146 static int saa5246a_detach(struct i2c_client *client)
 147 {
 148         struct video_device *vd = i2c_get_clientdata(client);
 149         i2c_detach_client(client);
 150         video_unregister_device(vd);
 151         kfree(vd->priv);
 152         kfree(client);
 153         return 0;
 154 }
 155
 156 /*
 157  *      I2C interfaces
 158  */
 159
 160 static struct i2c_driver i2c_driver_videotext =
 161 {
 162         .driver = {
 163                 .name   = IF_NAME,              /* name */
 164         },
 165         .id             = I2C_DRIVERID_SAA5249, /* in i2c.h */
 166         .attach_adapter = saa5246a_probe,
 167         .detach_client  = saa5246a_detach,
 168 };
 169
 170 static struct i2c_client client_template = {
 171         .driver         = &i2c_driver_videotext,
 172         .name           = "(unset)",
 173 };
 174
 175 static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
 176 {
 177         char buf[64];
 178
 179         buf[0] = reg;
 180         memcpy(buf+1, data, count);
 181
 182         if(i2c_master_send(t->client, buf, count+1)==count+1)
 183                 return 0;
 184         return -1;
 185 }
 186
 187 static int i2c_senddata(struct saa5246a_device *t, ...)
 188 {
 189         unsigned char buf[64];
 190         int v;
 191         int ct=0;
 192         va_list argp;
 193         va_start(argp,t);
 194
 195         while((v=va_arg(argp,int))!=-1)
 196                 buf[ct++]=v;
 197         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 198 }
 199
 200 /* Get count number of bytes from I²C-device at address adr, store them in buf.
 201  * Start & stop handshaking is done by this routine, ack will be sent after the
 202  * last byte to inhibit further sending of data. If uaccess is TRUE, data is
 203  * written to user-space with put_user. Returns -1 if I²C-device didn't send
 204  * acknowledge, 0 otherwise
 205  */
 206 static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
 207 {
 208         if(i2c_master_recv(t->client, buf, count)!=count)
 209                 return -1;
 210         return 0;
 211 }
 212
 213 /* When a page is found then the not FOUND bit in one of the status registers
 214  * of the SAA5264A chip is cleared. Unfortunately this bit is not set
 215  * automatically when a new page is requested. Instead this function must be
 216  * called after a page has been requested.
 217  *
 218  * Return value: 0 if successful
 219  */
 220 static int saa5246a_clear_found_bit(struct saa5246a_device *t,
 221         unsigned char dau_no)
 222 {
 223         unsigned char row_25_column_8;
 224
 225         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 226
 227                 dau_no |
 228                 R8_DO_NOT_CLEAR_MEMORY,
 229
 230                 R9_CURSER_ROW_25,
 231
 232                 R10_CURSER_COLUMN_8,
 233
 234                 COMMAND_END) ||
 235                 i2c_getdata(t, 1, &row_25_column_8))
 236         {
 237                 return -EIO;
 238         }
 239         row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
 240         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 241
 242                 dau_no |
 243                 R8_DO_NOT_CLEAR_MEMORY,
 244
 245                 R9_CURSER_ROW_25,
 246
 247                 R10_CURSER_COLUMN_8,
 248
 249                 row_25_column_8,
 250
 251                 COMMAND_END))
 252         {
 253                 return -EIO;
 254         }
 255
 256         return 0;
 257 }
 258
 259 /* Requests one videotext page as described in req. The fields of req are
 260  * checked and an error is returned if something is invalid.
 261  *
 262  * Return value: 0 if successful
 263  */
 264 static int saa5246a_request_page(struct saa5246a_device *t,
 265     vtx_pagereq_t *req)
 266 {
 267         if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
 268                 return -EINVAL;
 269         if (req->pagemask & PGMASK_PAGE)
 270                 if (req->page < 0 || req->page > PAGE_MAX)
 271                         return -EINVAL;
 272         if (req->pagemask & PGMASK_HOUR)
 273                 if (req->hour < 0 || req->hour > HOUR_MAX)
 274                         return -EINVAL;
 275         if (req->pagemask & PGMASK_MINUTE)
 276                 if (req->minute < 0 || req->minute > MINUTE_MAX)
 277                         return -EINVAL;
 278         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 279                 return -EINVAL;
 280
 281         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 282
 283                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 284                 req->pgbuf << 4 |
 285                 R2_BANK_0 |
 286                 R2_HAMMING_CHECK_OFF,
 287
 288                 HUNDREDS_OF_PAGE(req->page) |
 289                 R3_HOLD_PAGE |
 290                 (req->pagemask & PG_HUND ?
 291                         R3_PAGE_HUNDREDS_DO_CARE :
 292                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 293
 294                 TENS_OF_PAGE(req->page) |
 295                 (req->pagemask & PG_TEN ?
 296                         R3_PAGE_TENS_DO_CARE :
 297                         R3_PAGE_TENS_DO_NOT_CARE),
 298
 299                 UNITS_OF_PAGE(req->page) |
 300                 (req->pagemask & PG_UNIT ?
 301                         R3_PAGE_UNITS_DO_CARE :
 302                         R3_PAGE_UNITS_DO_NOT_CARE),
 303
 304                 TENS_OF_HOUR(req->hour) |
 305                 (req->pagemask & HR_TEN ?
 306                         R3_HOURS_TENS_DO_CARE :
 307                         R3_HOURS_TENS_DO_NOT_CARE),
 308
 309                 UNITS_OF_HOUR(req->hour) |
 310                 (req->pagemask & HR_UNIT ?
 311                         R3_HOURS_UNITS_DO_CARE :
 312                         R3_HOURS_UNITS_DO_NOT_CARE),
 313
 314                 TENS_OF_MINUTE(req->minute) |
 315                 (req->pagemask & MIN_TEN ?
 316                         R3_MINUTES_TENS_DO_CARE :
 317                         R3_MINUTES_TENS_DO_NOT_CARE),
 318
 319                 UNITS_OF_MINUTE(req->minute) |
 320                 (req->pagemask & MIN_UNIT ?
 321                         R3_MINUTES_UNITS_DO_CARE :
 322                         R3_MINUTES_UNITS_DO_NOT_CARE),
 323
 324                 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
 325
 326                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 327                 req->pgbuf << 4 |
 328                 R2_BANK_0 |
 329                 R2_HAMMING_CHECK_OFF,
 330
 331                 HUNDREDS_OF_PAGE(req->page) |
 332                 R3_UPDATE_PAGE |
 333                 (req->pagemask & PG_HUND ?
 334                         R3_PAGE_HUNDREDS_DO_CARE :
 335                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 336
 337                 COMMAND_END))
 338         {
 339                 return -EIO;
 340         }
 341
 342         t->is_searching[req->pgbuf] = TRUE;
 343         return 0;
 344 }
 345
 346 /* This routine decodes the page number from the infobits contained in line 25.
 347  *
 348  * Parameters:
 349  * infobits: must be bits 0 to 9 of column 25
 350  *
 351  * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
 352  */
 353 static inline int saa5246a_extract_pagenum_from_infobits(
 354     unsigned char infobits[10])
 355 {
 356         int page_hundreds, page_tens, page_units;
 357
 358         page_units    = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
 359         page_tens     = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
 360         page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
 361
 362         /* page 0x.. means page 8.. */
 363         if (page_hundreds == 0)
 364                 page_hundreds = 8;
 365
 366         return((page_hundreds << 8) | (page_tens << 4) | page_units);
 367 }
 368
 369 /* Decodes the hour from the infobits contained in line 25.
 370  *
 371  * Parameters:
 372  * infobits: must be bits 0 to 9 of column 25
 373  *
 374  * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
 375  */
 376 static inline int saa5246a_extract_hour_from_infobits(
 377     unsigned char infobits[10])
 378 {
 379         int hour_tens, hour_units;
 380
 381         hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
 382         hour_tens  = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
 383
 384         return((hour_tens << 4) | hour_units);
 385 }
 386
 387 /* Decodes the minutes from the infobits contained in line 25.
 388  *
 389  * Parameters:
 390  * infobits: must be bits 0 to 9 of column 25
 391  *
 392  * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
 393  */
 394 static inline int saa5246a_extract_minutes_from_infobits(
 395     unsigned char infobits[10])
 396 {
 397         int minutes_tens, minutes_units;
 398
 399         minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
 400         minutes_tens  = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
 401
 402         return((minutes_tens << 4) | minutes_units);
 403 }
 404
 405 /* Reads the status bits contained in the first 10 columns of the first line
 406  * and extracts the information into info.
 407  *
 408  * Return value: 0 if successful
 409  */
 410 static inline int saa5246a_get_status(struct saa5246a_device *t,
 411     vtx_pageinfo_t *info, unsigned char dau_no)
 412 {
 413         unsigned char infobits[10];
 414         int column;
 415
 416         if (dau_no >= NUM_DAUS)
 417                 return -EINVAL;
 418
 419         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 420
 421                 dau_no |
 422                 R8_DO_NOT_CLEAR_MEMORY,
 423
 424                 R9_CURSER_ROW_25,
 425
 426                 R10_CURSER_COLUMN_0,
 427
 428                 COMMAND_END) ||
 429                 i2c_getdata(t, 10, infobits))
 430         {
 431                 return -EIO;
 432         }
 433
 434         info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
 435         info->hour    = saa5246a_extract_hour_from_infobits(infobits);
 436         info->minute  = saa5246a_extract_minutes_from_infobits(infobits);
 437         info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
 438         info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
 439         info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
 440         info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
 441         info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
 442         info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
 443         info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
 444         info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
 445         info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
 446         info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
 447         info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
 448         info->hamming = 0;
 449         for (column = 0; column <= 7; column++) {
 450                 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
 451                         info->hamming = 1;
 452                         break;
 453                 }
 454         }
 455         if (!info->hamming && !info->notfound)
 456                 t->is_searching[dau_no] = FALSE;
 457         return 0;
 458 }
 459
 460 /* Reads 1 videotext page buffer of the SAA5246A.
 461  *
 462  * req is used both as input and as output. It contains information which part
 463  * must be read. The videotext page is copied into req->buffer.
 464  *
 465  * Return value: 0 if successful
 466  */
 467 static inline int saa5246a_get_page(struct saa5246a_device *t,
 468         vtx_pagereq_t *req)
 469 {
 470         int start, end, size;
 471         char *buf;
 472         int err;
 473
 474         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
 475             req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
 476                 return -EINVAL;
 477
 478         buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
 479         if (!buf)
 480                 return -ENOMEM;
 481
 482         /* Read "normal" part of page */
 483         err = -EIO;
 484
 485         end = min(req->end, VTX_PAGESIZE - 1);
 486         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 487                         req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
 488                         ROW(req->start), COLUMN(req->start), COMMAND_END))
 489                 goto out;
 490         if (i2c_getdata(t, end - req->start + 1, buf))
 491                 goto out;
 492         err = -EFAULT;
 493         if (copy_to_user(req->buffer, buf, end - req->start + 1))
 494                 goto out;
 495
 496         /* Always get the time from buffer 4, since this stupid SAA5246A only
 497          * updates the currently displayed buffer...
 498          */
 499         if (REQ_CONTAINS_TIME(req)) {
 500                 start = max(req->start, POS_TIME_START);
 501                 end   = min(req->end,   POS_TIME_END);
 502                 size = end - start + 1;
 503                 err = -EINVAL;
 504                 if (size < 0)
 505                         goto out;
 506                 err = -EIO;
 507                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 508                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 509                                 R9_CURSER_ROW_0, start, COMMAND_END))
 510                         goto out;
 511                 if (i2c_getdata(t, size, buf))
 512                         goto out;
 513                 err = -EFAULT;
 514                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 515                         goto out;
 516         }
 517         /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
 518         if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
 519                 start = max(req->start, POS_HEADER_START);
 520                 end   = min(req->end,   POS_HEADER_END);
 521                 size = end - start + 1;
 522                 err = -EINVAL;
 523                 if (size < 0)
 524                         goto out;
 525                 err = -EIO;
 526                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 527                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 528                                 R9_CURSER_ROW_0, start, COMMAND_END))
 529                         goto out;
 530                 if (i2c_getdata(t, end - start + 1, buf))
 531                         goto out;
 532                 err = -EFAULT;
 533                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 534                         goto out;
 535         }
 536         err = 0;
 537 out:
 538         kfree(buf);
 539         return err;
 540 }
 541
 542 /* Stops the acquisition circuit given in dau_no. The page buffer associated
 543  * with this acquisition circuit will no more be updated. The other daus are
 544  * not affected.
 545  *
 546  * Return value: 0 if successful
 547  */
 548 static inline int saa5246a_stop_dau(struct saa5246a_device *t,
 549     unsigned char dau_no)
 550 {
 551         if (dau_no >= NUM_DAUS)
 552                 return -EINVAL;
 553         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 554
 555                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 556                 dau_no << 4 |
 557                 R2_BANK_0 |
 558                 R2_HAMMING_CHECK_OFF,
 559
 560                 R3_PAGE_HUNDREDS_0 |
 561                 R3_HOLD_PAGE |
 562                 R3_PAGE_HUNDREDS_DO_NOT_CARE,
 563
 564                 COMMAND_END))
 565         {
 566                 return -EIO;
 567         }
 568         t->is_searching[dau_no] = FALSE;
 569         return 0;
 570 }
 571
 572 /*  Handles ioctls defined in videotext.h
 573  *
 574  *  Returns 0 if successful
 575  */
 576 static int do_saa5246a_ioctl(struct inode *inode, struct file *file,
 577                             unsigned int cmd, void *arg)
 578 {
 579         struct video_device *vd = video_devdata(file);
 580         struct saa5246a_device *t=vd->priv;
 581         switch(cmd)
 582         {
 583                 case VTXIOCGETINFO:
 584                 {
 585                         vtx_info_t *info = arg;
 586
 587                         info->version_major = MAJOR_VERSION;
 588                         info->version_minor = MINOR_VERSION;
 589                         info->numpages = NUM_DAUS;
 590                         return 0;
 591                 }
 592
 593                 case VTXIOCCLRPAGE:
 594                 {
 595                         vtx_pagereq_t *req = arg;
 596
 597                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 598                                 return -EINVAL;
 599                         memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0]));
 600                         return 0;
 601                 }
 602
 603                 case VTXIOCCLRFOUND:
 604                 {
 605                         vtx_pagereq_t *req = arg;
 606
 607                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 608                                 return -EINVAL;
 609                         return(saa5246a_clear_found_bit(t, req->pgbuf));
 610                 }
 611
 612                 case VTXIOCPAGEREQ:
 613                 {
 614                         vtx_pagereq_t *req = arg;
 615
 616                         return(saa5246a_request_page(t, req));
 617                 }
 618
 619                 case VTXIOCGETSTAT:
 620                 {
 621                         vtx_pagereq_t *req = arg;
 622                         vtx_pageinfo_t info;
 623                         int rval;
 624
 625                         if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
 626                                 return rval;
 627                         if(copy_to_user(req->buffer, &info,
 628                                 sizeof(vtx_pageinfo_t)))
 629                                 return -EFAULT;
 630                         return 0;
 631                 }
 632
 633                 case VTXIOCGETPAGE:
 634                 {
 635                         vtx_pagereq_t *req = arg;
 636
 637                         return(saa5246a_get_page(t, req));
 638                 }
 639
 640                 case VTXIOCSTOPDAU:
 641                 {
 642                         vtx_pagereq_t *req = arg;
 643
 644                         return(saa5246a_stop_dau(t, req->pgbuf));
 645                 }
 646
 647                 case VTXIOCPUTPAGE:
 648                 case VTXIOCSETDISP:
 649                 case VTXIOCPUTSTAT:
 650                         return 0;
 651
 652                 case VTXIOCCLRCACHE:
 653                 {
 654                         return 0;
 655                 }
 656
 657                 case VTXIOCSETVIRT:
 658                 {
 659                         /* I do not know what "virtual mode" means */
 660                         return 0;
 661                 }
 662         }
 663         return -EINVAL;
 664 }
 665
 666 /*
 667  * Translates old vtx IOCTLs to new ones
 668  *
 669  * This keeps new kernel versions compatible with old userspace programs.
 670  */
 671 static inline unsigned int vtx_fix_command(unsigned int cmd)
 672 {
 673         switch (cmd) {
 674         case VTXIOCGETINFO_OLD:
 675                 cmd = VTXIOCGETINFO;
 676                 break;
 677         case VTXIOCCLRPAGE_OLD:
 678                 cmd = VTXIOCCLRPAGE;
 679                 break;
 680         case VTXIOCCLRFOUND_OLD:
 681                 cmd = VTXIOCCLRFOUND;
 682                 break;
 683         case VTXIOCPAGEREQ_OLD:
 684                 cmd = VTXIOCPAGEREQ;
 685                 break;
 686         case VTXIOCGETSTAT_OLD:
 687                 cmd = VTXIOCGETSTAT;
 688                 break;
 689         case VTXIOCGETPAGE_OLD:
 690                 cmd = VTXIOCGETPAGE;
 691                 break;
 692         case VTXIOCSTOPDAU_OLD:
 693                 cmd = VTXIOCSTOPDAU;
 694                 break;
 695         case VTXIOCPUTPAGE_OLD:
 696                 cmd = VTXIOCPUTPAGE;
 697                 break;
 698         case VTXIOCSETDISP_OLD:
 699                 cmd = VTXIOCSETDISP;
 700                 break;
 701         case VTXIOCPUTSTAT_OLD:
 702                 cmd = VTXIOCPUTSTAT;
 703                 break;
 704         case VTXIOCCLRCACHE_OLD:
 705                 cmd = VTXIOCCLRCACHE;
 706                 break;
 707         case VTXIOCSETVIRT_OLD:
 708                 cmd = VTXIOCSETVIRT;
 709                 break;
 710         }
 711         return cmd;
 712 }
 713
 714 /*
 715  *      Handle the locking
 716  */
 717 static int saa5246a_ioctl(struct inode *inode, struct file *file,
 718                          unsigned int cmd, unsigned long arg)
 719 {
 720         struct video_device *vd = video_devdata(file);
 721         struct saa5246a_device *t = vd->priv;
 722         int err;
 723
 724         cmd = vtx_fix_command(cmd);
 725         mutex_lock(&t->lock);
 726         err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
 727         mutex_unlock(&t->lock);
 728         return err;
 729 }
 730
 731 static int saa5246a_open(struct inode *inode, struct file *file)
 732 {
 733         struct video_device *vd = video_devdata(file);
 734         struct saa5246a_device *t = vd->priv;
 735         int err;
 736
 737         err = video_exclusive_open(inode,file);
 738         if (err < 0)
 739                 return err;
 740
 741         if (t->client==NULL) {
 742                 err = -ENODEV;
 743                 goto fail;
 744         }
 745
 746         if (i2c_senddata(t, SAA5246A_REGISTER_R0,
 747
 748                 R0_SELECT_R11 |
 749                 R0_PLL_TIME_CONSTANT_LONG |
 750                 R0_ENABLE_nODD_EVEN_OUTPUT |
 751                 R0_ENABLE_HDR_POLL |
 752                 R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
 753                 R0_NO_FREE_RUN_PLL |
 754                 R0_NO_AUTOMATIC_FASTEXT_PROMPT,
 755
 756                 R1_NON_INTERLACED_312_312_LINES |
 757                 R1_DEW |
 758                 R1_EXTENDED_PACKET_DISABLE |
 759                 R1_DAUS_ALL_ON |
 760                 R1_8_BITS_NO_PARITY |
 761                 R1_VCS_TO_SCS,
 762
 763                 COMMAND_END) ||
 764                 i2c_senddata(t, SAA5246A_REGISTER_R4,
 765
 766                 /* We do not care much for the TV display but nevertheless we
 767                  * need the currently displayed page later because only on that
 768                  * page the time is updated. */
 769                 R4_DISPLAY_PAGE_4,
 770
 771                 COMMAND_END))
 772         {
 773                 err = -EIO;
 774                 goto fail;
 775         }
 776
 777         return 0;
 778
 779 fail:
 780         video_exclusive_release(inode,file);
 781         return err;
 782 }
 783
 784 static int saa5246a_release(struct inode *inode, struct file *file)
 785 {
 786         struct video_device *vd = video_devdata(file);
 787         struct saa5246a_device *t = vd->priv;
 788
 789         /* Stop all acquisition circuits. */
 790         i2c_senddata(t, SAA5246A_REGISTER_R1,
 791
 792                 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
 793                 R1_DEW |
 794                 R1_EXTENDED_PACKET_DISABLE |
 795                 R1_DAUS_ALL_OFF |
 796                 R1_8_BITS_NO_PARITY |
 797                 R1_VCS_TO_SCS,
 798
 799                 COMMAND_END);
 800         video_exclusive_release(inode,file);
 801         return 0;
 802 }
 803
 804 static int __init init_saa_5246a (void)
 805 {
 806         printk(KERN_INFO
 807                 "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
 808                 MAJOR_VERSION, MINOR_VERSION);
 809         return i2c_add_driver(&i2c_driver_videotext);
 810 }
 811
 812 static void __exit cleanup_saa_5246a (void)
 813 {
 814         i2c_del_driver(&i2c_driver_videotext);
 815 }
 816
 817 module_init(init_saa_5246a);
 818 module_exit(cleanup_saa_5246a);
 819
 820 static const struct file_operations saa_fops = {
 821         .owner   = THIS_MODULE,
 822         .open    = saa5246a_open,
 823         .release = saa5246a_release,
 824         .ioctl   = saa5246a_ioctl,
 825         .llseek  = no_llseek,
 826 };
 827
 828 static struct video_device saa_template =
 829 {
 830         .owner    = THIS_MODULE,
 831         .name     = IF_NAME,
 832         .type     = VID_TYPE_TELETEXT,
 833         .fops     = &saa_fops,
 834         .release  = video_device_release,
 835         .minor    = -1,
 836 };