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 I2C_CLIENT_INSMOD;
  68
  69 static struct i2c_client client_template;
  70
  71 static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind)
  72 {
  73         int pgbuf;
  74         int err;
  75         struct i2c_client *client;
  76         struct video_device *vd;
  77         struct saa5246a_device *t;
  78
  79         printk(KERN_INFO "saa5246a: teletext chip found.\n");
  80         client=kmalloc(sizeof(*client), GFP_KERNEL);
  81         if(client==NULL)
  82                 return -ENOMEM;
  83         client_template.adapter = adap;
  84         client_template.addr = addr;
  85         memcpy(client, &client_template, sizeof(*client));
  86         t = kmalloc(sizeof(*t), GFP_KERNEL);
  87         if(t==NULL)
  88         {
  89                 kfree(client);
  90                 return -ENOMEM;
  91         }
  92         memset(t, 0, sizeof(*t));
  93         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
  94         init_MUTEX(&t->lock);
  95
  96         /*
  97          *      Now create a video4linux device
  98          */
  99
 100         vd = video_device_alloc();
 101         if(vd==NULL)
 102         {
 103                 kfree(t);
 104                 kfree(client);
 105                 return -ENOMEM;
 106         }
 107         i2c_set_clientdata(client, vd);
 108         memcpy(vd, &saa_template, sizeof(*vd));
 109
 110         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 111         {
 112                 memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
 113                 t->is_searching[pgbuf] = FALSE;
 114         }
 115         vd->priv=t;
 116
 117
 118         /*
 119          *      Register it
 120          */
 121
 122         if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
 123         {
 124                 kfree(t);
 125                 kfree(client);
 126                 video_device_release(vd);
 127                 return err;
 128         }
 129         t->client = client;
 130         i2c_attach_client(client);
 131         return 0;
 132 }
 133
 134 /*
 135  *      We do most of the hard work when we become a device on the i2c.
 136  */
 137 static int saa5246a_probe(struct i2c_adapter *adap)
 138 {
 139         if (adap->class & I2C_CLASS_TV_ANALOG)
 140                 return i2c_probe(adap, &addr_data, saa5246a_attach);
 141         return 0;
 142 }
 143
 144 static int saa5246a_detach(struct i2c_client *client)
 145 {
 146         struct video_device *vd = i2c_get_clientdata(client);
 147         i2c_detach_client(client);
 148         video_unregister_device(vd);
 149         kfree(vd->priv);
 150         kfree(client);
 151         return 0;
 152 }
 153
 154 static int saa5246a_command(struct i2c_client *device, unsigned int cmd,
 155         void *arg)
 156 {
 157         return -EINVAL;
 158 }
 159
 160 /*
 161  *      I2C interfaces
 162  */
 163
 164 static struct i2c_driver i2c_driver_videotext =
 165 {
 166         .owner          = THIS_MODULE,
 167         .name           = IF_NAME,              /* name */
 168         .id             = I2C_DRIVERID_SAA5249, /* in i2c.h */
 169         .attach_adapter = saa5246a_probe,
 170         .detach_client  = saa5246a_detach,
 171         .command        = saa5246a_command
 172 };
 173
 174 static struct i2c_client client_template = {
 175         .driver         = &i2c_driver_videotext,
 176         .name           = "(unset)",
 177 };
 178
 179 static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
 180 {
 181         char buf[64];
 182
 183         buf[0] = reg;
 184         memcpy(buf+1, data, count);
 185
 186         if(i2c_master_send(t->client, buf, count+1)==count+1)
 187                 return 0;
 188         return -1;
 189 }
 190
 191 static int i2c_senddata(struct saa5246a_device *t, ...)
 192 {
 193         unsigned char buf[64];
 194         int v;
 195         int ct=0;
 196         va_list argp;
 197         va_start(argp,t);
 198
 199         while((v=va_arg(argp,int))!=-1)
 200                 buf[ct++]=v;
 201         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 202 }
 203
 204 /* Get count number of bytes from I²C-device at address adr, store them in buf.
 205  * Start & stop handshaking is done by this routine, ack will be sent after the
 206  * last byte to inhibit further sending of data. If uaccess is TRUE, data is
 207  * written to user-space with put_user. Returns -1 if I²C-device didn't send
 208  * acknowledge, 0 otherwise
 209  */
 210 static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
 211 {
 212         if(i2c_master_recv(t->client, buf, count)!=count)
 213                 return -1;
 214         return 0;
 215 }
 216
 217 /* When a page is found then the not FOUND bit in one of the status registers
 218  * of the SAA5264A chip is cleared. Unfortunately this bit is not set
 219  * automatically when a new page is requested. Instead this function must be
 220  * called after a page has been requested.
 221  *
 222  * Return value: 0 if successful
 223  */
 224 static int saa5246a_clear_found_bit(struct saa5246a_device *t,
 225         unsigned char dau_no)
 226 {
 227         unsigned char row_25_column_8;
 228
 229         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 230
 231                 dau_no |
 232                 R8_DO_NOT_CLEAR_MEMORY,
 233
 234                 R9_CURSER_ROW_25,
 235
 236                 R10_CURSER_COLUMN_8,
 237
 238                 COMMAND_END) ||
 239                 i2c_getdata(t, 1, &row_25_column_8))
 240         {
 241                 return -EIO;
 242         }
 243         row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
 244         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 245
 246                 dau_no |
 247                 R8_DO_NOT_CLEAR_MEMORY,
 248
 249                 R9_CURSER_ROW_25,
 250
 251                 R10_CURSER_COLUMN_8,
 252
 253                 row_25_column_8,
 254
 255                 COMMAND_END))
 256         {
 257                 return -EIO;
 258         }
 259
 260         return 0;
 261 }
 262
 263 /* Requests one videotext page as described in req. The fields of req are
 264  * checked and an error is returned if something is invalid.
 265  *
 266  * Return value: 0 if successful
 267  */
 268 static int saa5246a_request_page(struct saa5246a_device *t,
 269     vtx_pagereq_t *req)
 270 {
 271         if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
 272                 return -EINVAL;
 273         if (req->pagemask & PGMASK_PAGE)
 274                 if (req->page < 0 || req->page > PAGE_MAX)
 275                         return -EINVAL;
 276         if (req->pagemask & PGMASK_HOUR)
 277                 if (req->hour < 0 || req->hour > HOUR_MAX)
 278                         return -EINVAL;
 279         if (req->pagemask & PGMASK_MINUTE)
 280                 if (req->minute < 0 || req->minute > MINUTE_MAX)
 281                         return -EINVAL;
 282         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 283                 return -EINVAL;
 284
 285         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 286
 287                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 288                 req->pgbuf << 4 |
 289                 R2_BANK_0 |
 290                 R2_HAMMING_CHECK_OFF,
 291
 292                 HUNDREDS_OF_PAGE(req->page) |
 293                 R3_HOLD_PAGE |
 294                 (req->pagemask & PG_HUND ?
 295                         R3_PAGE_HUNDREDS_DO_CARE :
 296                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 297
 298                 TENS_OF_PAGE(req->page) |
 299                 (req->pagemask & PG_TEN ?
 300                         R3_PAGE_TENS_DO_CARE :
 301                         R3_PAGE_TENS_DO_NOT_CARE),
 302
 303                 UNITS_OF_PAGE(req->page) |
 304                 (req->pagemask & PG_UNIT ?
 305                         R3_PAGE_UNITS_DO_CARE :
 306                         R3_PAGE_UNITS_DO_NOT_CARE),
 307
 308                 TENS_OF_HOUR(req->hour) |
 309                 (req->pagemask & HR_TEN ?
 310                         R3_HOURS_TENS_DO_CARE :
 311                         R3_HOURS_TENS_DO_NOT_CARE),
 312
 313                 UNITS_OF_HOUR(req->hour) |
 314                 (req->pagemask & HR_UNIT ?
 315                         R3_HOURS_UNITS_DO_CARE :
 316                         R3_HOURS_UNITS_DO_NOT_CARE),
 317
 318                 TENS_OF_MINUTE(req->minute) |
 319                 (req->pagemask & MIN_TEN ?
 320                         R3_MINUTES_TENS_DO_CARE :
 321                         R3_MINUTES_TENS_DO_NOT_CARE),
 322
 323                 UNITS_OF_MINUTE(req->minute) |
 324                 (req->pagemask & MIN_UNIT ?
 325                         R3_MINUTES_UNITS_DO_CARE :
 326                         R3_MINUTES_UNITS_DO_NOT_CARE),
 327
 328                 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
 329
 330                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 331                 req->pgbuf << 4 |
 332                 R2_BANK_0 |
 333                 R2_HAMMING_CHECK_OFF,
 334
 335                 HUNDREDS_OF_PAGE(req->page) |
 336                 R3_UPDATE_PAGE |
 337                 (req->pagemask & PG_HUND ?
 338                         R3_PAGE_HUNDREDS_DO_CARE :
 339                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 340
 341                 COMMAND_END))
 342         {
 343                 return -EIO;
 344         }
 345
 346         t->is_searching[req->pgbuf] = TRUE;
 347         return 0;
 348 }
 349
 350 /* This routine decodes the page number from the infobits contained in line 25.
 351  *
 352  * Parameters:
 353  * infobits: must be bits 0 to 9 of column 25
 354  *
 355  * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
 356  */
 357 static inline int saa5246a_extract_pagenum_from_infobits(
 358     unsigned char infobits[10])
 359 {
 360         int page_hundreds, page_tens, page_units;
 361
 362         page_units    = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
 363         page_tens     = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
 364         page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
 365
 366         /* page 0x.. means page 8.. */
 367         if (page_hundreds == 0)
 368                 page_hundreds = 8;
 369
 370         return((page_hundreds << 8) | (page_tens << 4) | page_units);
 371 }
 372
 373 /* Decodes the hour from the infobits contained in line 25.
 374  *
 375  * Parameters:
 376  * infobits: must be bits 0 to 9 of column 25
 377  *
 378  * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
 379  */
 380 static inline int saa5246a_extract_hour_from_infobits(
 381     unsigned char infobits[10])
 382 {
 383         int hour_tens, hour_units;
 384
 385         hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
 386         hour_tens  = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
 387
 388         return((hour_tens << 4) | hour_units);
 389 }
 390
 391 /* Decodes the minutes from the infobits contained in line 25.
 392  *
 393  * Parameters:
 394  * infobits: must be bits 0 to 9 of column 25
 395  *
 396  * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
 397  */
 398 static inline int saa5246a_extract_minutes_from_infobits(
 399     unsigned char infobits[10])
 400 {
 401         int minutes_tens, minutes_units;
 402
 403         minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
 404         minutes_tens  = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
 405
 406         return((minutes_tens << 4) | minutes_units);
 407 }
 408
 409 /* Reads the status bits contained in the first 10 columns of the first line
 410  * and extracts the information into info.
 411  *
 412  * Return value: 0 if successful
 413  */
 414 static inline int saa5246a_get_status(struct saa5246a_device *t,
 415     vtx_pageinfo_t *info, unsigned char dau_no)
 416 {
 417         unsigned char infobits[10];
 418         int column;
 419
 420         if (dau_no >= NUM_DAUS)
 421                 return -EINVAL;
 422
 423         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 424
 425                 dau_no |
 426                 R8_DO_NOT_CLEAR_MEMORY,
 427
 428                 R9_CURSER_ROW_25,
 429
 430                 R10_CURSER_COLUMN_0,
 431
 432                 COMMAND_END) ||
 433                 i2c_getdata(t, 10, infobits))
 434         {
 435                 return -EIO;
 436         }
 437
 438         info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
 439         info->hour    = saa5246a_extract_hour_from_infobits(infobits);
 440         info->minute  = saa5246a_extract_minutes_from_infobits(infobits);
 441         info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
 442         info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
 443         info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
 444         info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
 445         info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
 446         info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
 447         info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
 448         info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
 449         info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
 450         info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
 451         info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
 452         info->hamming = 0;
 453         for (column = 0; column <= 7; column++) {
 454                 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
 455                         info->hamming = 1;
 456                         break;
 457                 }
 458         }
 459         if (!info->hamming && !info->notfound)
 460                 t->is_searching[dau_no] = FALSE;
 461         return 0;
 462 }
 463
 464 /* Reads 1 videotext page buffer of the SAA5246A.
 465  *
 466  * req is used both as input and as output. It contains information which part
 467  * must be read. The videotext page is copied into req->buffer.
 468  *
 469  * Return value: 0 if successful
 470  */
 471 static inline int saa5246a_get_page(struct saa5246a_device *t,
 472         vtx_pagereq_t *req)
 473 {
 474         int start, end, size;
 475         char *buf;
 476         int err;
 477
 478         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
 479             req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
 480                 return -EINVAL;
 481
 482         buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
 483         if (!buf)
 484                 return -ENOMEM;
 485
 486         /* Read "normal" part of page */
 487         err = -EIO;
 488
 489         end = min(req->end, VTX_PAGESIZE - 1);
 490         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 491                         req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
 492                         ROW(req->start), COLUMN(req->start), COMMAND_END))
 493                 goto out;
 494         if (i2c_getdata(t, end - req->start + 1, buf))
 495                 goto out;
 496         err = -EFAULT;
 497         if (copy_to_user(req->buffer, buf, end - req->start + 1))
 498                 goto out;
 499
 500         /* Always get the time from buffer 4, since this stupid SAA5246A only
 501          * updates the currently displayed buffer...
 502          */
 503         if (REQ_CONTAINS_TIME(req)) {
 504                 start = max(req->start, POS_TIME_START);
 505                 end   = min(req->end,   POS_TIME_END);
 506                 size = end - start + 1;
 507                 err = -EINVAL;
 508                 if (size < 0)
 509                         goto out;
 510                 err = -EIO;
 511                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 512                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 513                                 R9_CURSER_ROW_0, start, COMMAND_END))
 514                         goto out;
 515                 if (i2c_getdata(t, size, buf))
 516                         goto out;
 517                 err = -EFAULT;
 518                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 519                         goto out;
 520         }
 521         /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
 522         if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
 523                 start = max(req->start, POS_HEADER_START);
 524                 end   = min(req->end,   POS_HEADER_END);
 525                 size = end - start + 1;
 526                 err = -EINVAL;
 527                 if (size < 0)
 528                         goto out;
 529                 err = -EIO;
 530                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 531                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 532                                 R9_CURSER_ROW_0, start, COMMAND_END))
 533                         goto out;
 534                 if (i2c_getdata(t, end - start + 1, buf))
 535                         goto out;
 536                 err = -EFAULT;
 537                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 538                         goto out;
 539         }
 540         err = 0;
 541 out:
 542         kfree(buf);
 543         return err;
 544 }
 545
 546 /* Stops the acquisition circuit given in dau_no. The page buffer associated
 547  * with this acquisition circuit will no more be updated. The other daus are
 548  * not affected.
 549  *
 550  * Return value: 0 if successful
 551  */
 552 static inline int saa5246a_stop_dau(struct saa5246a_device *t,
 553     unsigned char dau_no)
 554 {
 555         if (dau_no >= NUM_DAUS)
 556                 return -EINVAL;
 557         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 558
 559                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 560                 dau_no << 4 |
 561                 R2_BANK_0 |
 562                 R2_HAMMING_CHECK_OFF,
 563
 564                 R3_PAGE_HUNDREDS_0 |
 565                 R3_HOLD_PAGE |
 566                 R3_PAGE_HUNDREDS_DO_NOT_CARE,
 567
 568                 COMMAND_END))
 569         {
 570                 return -EIO;
 571         }
 572         t->is_searching[dau_no] = FALSE;
 573         return 0;
 574 }
 575
 576 /*  Handles ioctls defined in videotext.h
 577  *
 578  *  Returns 0 if successful
 579  */
 580 static int do_saa5246a_ioctl(struct inode *inode, struct file *file,
 581                             unsigned int cmd, void *arg)
 582 {
 583         struct video_device *vd = video_devdata(file);
 584         struct saa5246a_device *t=vd->priv;
 585         switch(cmd)
 586         {
 587                 case VTXIOCGETINFO:
 588                 {
 589                         vtx_info_t *info = arg;
 590
 591                         info->version_major = MAJOR_VERSION;
 592                         info->version_minor = MINOR_VERSION;
 593                         info->numpages = NUM_DAUS;
 594                         return 0;
 595                 }
 596
 597                 case VTXIOCCLRPAGE:
 598                 {
 599                         vtx_pagereq_t *req = arg;
 600
 601                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 602                                 return -EINVAL;
 603                         memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0]));
 604                         return 0;
 605                 }
 606
 607                 case VTXIOCCLRFOUND:
 608                 {
 609                         vtx_pagereq_t *req = arg;
 610
 611                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 612                                 return -EINVAL;
 613                         return(saa5246a_clear_found_bit(t, req->pgbuf));
 614                 }
 615
 616                 case VTXIOCPAGEREQ:
 617                 {
 618                         vtx_pagereq_t *req = arg;
 619
 620                         return(saa5246a_request_page(t, req));
 621                 }
 622
 623                 case VTXIOCGETSTAT:
 624                 {
 625                         vtx_pagereq_t *req = arg;
 626                         vtx_pageinfo_t info;
 627                         int rval;
 628
 629                         if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
 630                                 return rval;
 631                         if(copy_to_user(req->buffer, &info,
 632                                 sizeof(vtx_pageinfo_t)))
 633                                 return -EFAULT;
 634                         return 0;
 635                 }
 636
 637                 case VTXIOCGETPAGE:
 638                 {
 639                         vtx_pagereq_t *req = arg;
 640
 641                         return(saa5246a_get_page(t, req));
 642                 }
 643
 644                 case VTXIOCSTOPDAU:
 645                 {
 646                         vtx_pagereq_t *req = arg;
 647
 648                         return(saa5246a_stop_dau(t, req->pgbuf));
 649                 }
 650
 651                 case VTXIOCPUTPAGE:
 652                 case VTXIOCSETDISP:
 653                 case VTXIOCPUTSTAT:
 654                         return 0;
 655
 656                 case VTXIOCCLRCACHE:
 657                 {
 658                         return 0;
 659                 }
 660
 661                 case VTXIOCSETVIRT:
 662                 {
 663                         /* I do not know what "virtual mode" means */
 664                         return 0;
 665                 }
 666         }
 667         return -EINVAL;
 668 }
 669
 670 /*
 671  * Translates old vtx IOCTLs to new ones
 672  *
 673  * This keeps new kernel versions compatible with old userspace programs.
 674  */
 675 static inline unsigned int vtx_fix_command(unsigned int cmd)
 676 {
 677         switch (cmd) {
 678         case VTXIOCGETINFO_OLD:
 679                 cmd = VTXIOCGETINFO;
 680                 break;
 681         case VTXIOCCLRPAGE_OLD:
 682                 cmd = VTXIOCCLRPAGE;
 683                 break;
 684         case VTXIOCCLRFOUND_OLD:
 685                 cmd = VTXIOCCLRFOUND;
 686                 break;
 687         case VTXIOCPAGEREQ_OLD:
 688                 cmd = VTXIOCPAGEREQ;
 689                 break;
 690         case VTXIOCGETSTAT_OLD:
 691                 cmd = VTXIOCGETSTAT;
 692                 break;
 693         case VTXIOCGETPAGE_OLD:
 694                 cmd = VTXIOCGETPAGE;
 695                 break;
 696         case VTXIOCSTOPDAU_OLD:
 697                 cmd = VTXIOCSTOPDAU;
 698                 break;
 699         case VTXIOCPUTPAGE_OLD:
 700                 cmd = VTXIOCPUTPAGE;
 701                 break;
 702         case VTXIOCSETDISP_OLD:
 703                 cmd = VTXIOCSETDISP;
 704                 break;
 705         case VTXIOCPUTSTAT_OLD:
 706                 cmd = VTXIOCPUTSTAT;
 707                 break;
 708         case VTXIOCCLRCACHE_OLD:
 709                 cmd = VTXIOCCLRCACHE;
 710                 break;
 711         case VTXIOCSETVIRT_OLD:
 712                 cmd = VTXIOCSETVIRT;
 713                 break;
 714         }
 715         return cmd;
 716 }
 717
 718 /*
 719  *      Handle the locking
 720  */
 721 static int saa5246a_ioctl(struct inode *inode, struct file *file,
 722                          unsigned int cmd, unsigned long arg)
 723 {
 724         struct video_device *vd = video_devdata(file);
 725         struct saa5246a_device *t = vd->priv;
 726         int err;
 727
 728         cmd = vtx_fix_command(cmd);
 729         down(&t->lock);
 730         err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
 731         up(&t->lock);
 732         return err;
 733 }
 734
 735 static int saa5246a_open(struct inode *inode, struct file *file)
 736 {
 737         struct video_device *vd = video_devdata(file);
 738         struct saa5246a_device *t = vd->priv;
 739         int err;
 740
 741         err = video_exclusive_open(inode,file);
 742         if (err < 0)
 743                 return err;
 744
 745         if (t->client==NULL) {
 746                 err = -ENODEV;
 747                 goto fail;
 748         }
 749
 750         if (i2c_senddata(t, SAA5246A_REGISTER_R0,
 751
 752                 R0_SELECT_R11 |
 753                 R0_PLL_TIME_CONSTANT_LONG |
 754                 R0_ENABLE_nODD_EVEN_OUTPUT |
 755                 R0_ENABLE_HDR_POLL |
 756                 R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
 757                 R0_NO_FREE_RUN_PLL |
 758                 R0_NO_AUTOMATIC_FASTEXT_PROMPT,
 759
 760                 R1_NON_INTERLACED_312_312_LINES |
 761                 R1_DEW |
 762                 R1_EXTENDED_PACKET_DISABLE |
 763                 R1_DAUS_ALL_ON |
 764                 R1_8_BITS_NO_PARITY |
 765                 R1_VCS_TO_SCS,
 766
 767                 COMMAND_END) ||
 768                 i2c_senddata(t, SAA5246A_REGISTER_R4,
 769
 770                 /* We do not care much for the TV display but nevertheless we
 771                  * need the currently displayed page later because only on that
 772                  * page the time is updated. */
 773                 R4_DISPLAY_PAGE_4,
 774
 775                 COMMAND_END))
 776         {
 777                 err = -EIO;
 778                 goto fail;
 779         }
 780
 781         return 0;
 782
 783 fail:
 784         video_exclusive_release(inode,file);
 785         return err;
 786 }
 787
 788 static int saa5246a_release(struct inode *inode, struct file *file)
 789 {
 790         struct video_device *vd = video_devdata(file);
 791         struct saa5246a_device *t = vd->priv;
 792
 793         /* Stop all acquisition circuits. */
 794         i2c_senddata(t, SAA5246A_REGISTER_R1,
 795
 796                 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
 797                 R1_DEW |
 798                 R1_EXTENDED_PACKET_DISABLE |
 799                 R1_DAUS_ALL_OFF |
 800                 R1_8_BITS_NO_PARITY |
 801                 R1_VCS_TO_SCS,
 802
 803                 COMMAND_END);
 804         video_exclusive_release(inode,file);
 805         return 0;
 806 }
 807
 808 static int __init init_saa_5246a (void)
 809 {
 810         printk(KERN_INFO
 811                 "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
 812                 MAJOR_VERSION, MINOR_VERSION);
 813         return i2c_add_driver(&i2c_driver_videotext);
 814 }
 815
 816 static void __exit cleanup_saa_5246a (void)
 817 {
 818         i2c_del_driver(&i2c_driver_videotext);
 819 }
 820
 821 module_init(init_saa_5246a);
 822 module_exit(cleanup_saa_5246a);
 823
 824 static struct file_operations saa_fops = {
 825         .owner   = THIS_MODULE,
 826         .open    = saa5246a_open,
 827         .release = saa5246a_release,
 828         .ioctl   = saa5246a_ioctl,
 829         .llseek  = no_llseek,
 830 };
 831
 832 static struct video_device saa_template =
 833 {
 834         .owner    = THIS_MODULE,
 835         .name     = IF_NAME,
 836         .type     = VID_TYPE_TELETEXT,
 837         .hardware = VID_HARDWARE_SAA5249,
 838         .fops     = &saa_fops,
 839         .release  = video_device_release,
 840         .minor    = -1,
 841 };