git.oblomov.eu Git - linux-2.6/blob - 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 <linux/mutex.h>
  50
  51 #include "saa5246a.h"
  52
  53 MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
  54 MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver");
  55 MODULE_LICENSE("GPL");
  56
  57 struct saa5246a_device
  58 {
  59         u8     pgbuf[NUM_DAUS][VTX_VIRTUALSIZE];
  60         int    is_searching[NUM_DAUS];
  61         struct i2c_client *client;
  62         struct mutex lock;
  63 };
  64
  65 static struct video_device saa_template;        /* Declared near bottom */
  66
  67 /* Addresses to scan */
  68 static unsigned short normal_i2c[]       = { I2C_ADDRESS, I2C_CLIENT_END };
  69 I2C_CLIENT_INSMOD;
  70
  71 static struct i2c_client client_template;
  72
  73 static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind)
  74 {
  75         int pgbuf;
  76         int err;
  77         struct i2c_client *client;
  78         struct video_device *vd;
  79         struct saa5246a_device *t;
  80
  81         printk(KERN_INFO "saa5246a: teletext chip found.\n");
  82         client=kmalloc(sizeof(*client), GFP_KERNEL);
  83         if(client==NULL)
  84                 return -ENOMEM;
  85         client_template.adapter = adap;
  86         client_template.addr = addr;
  87         memcpy(client, &client_template, sizeof(*client));
  88         t = kzalloc(sizeof(*t), GFP_KERNEL);
  89         if(t==NULL)
  90         {
  91                 kfree(client);
  92                 return -ENOMEM;
  93         }
  94         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
  95         mutex_init(&t->lock);
  96
  97         /*
  98          *      Now create a video4linux device
  99          */
 100
 101         vd = video_device_alloc();
 102         if(vd==NULL)
 103         {
 104                 kfree(t);
 105                 kfree(client);
 106                 return -ENOMEM;
 107         }
 108         i2c_set_clientdata(client, vd);
 109         memcpy(vd, &saa_template, sizeof(*vd));
 110
 111         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 112         {
 113                 memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
 114                 t->is_searching[pgbuf] = FALSE;
 115         }
 116         vd->priv=t;
 117
 118
 119         /*
 120          *      Register it
 121          */
 122
 123         if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
 124         {
 125                 kfree(t);
 126                 kfree(client);
 127                 video_device_release(vd);
 128                 return err;
 129         }
 130         t->client = client;
 131         i2c_attach_client(client);
 132         return 0;
 133 }
 134
 135 /*
 136  *      We do most of the hard work when we become a device on the i2c.
 137  */
 138 static int saa5246a_probe(struct i2c_adapter *adap)
 139 {
 140         if (adap->class & I2C_CLASS_TV_ANALOG)
 141                 return i2c_probe(adap, &addr_data, saa5246a_attach);
 142         return 0;
 143 }
 144
 145 static int saa5246a_detach(struct i2c_client *client)
 146 {
 147         struct video_device *vd = i2c_get_clientdata(client);
 148         i2c_detach_client(client);
 149         video_unregister_device(vd);
 150         kfree(vd->priv);
 151         kfree(client);
 152         return 0;
 153 }
 154
 155 /*
 156  *      I2C interfaces
 157  */
 158
 159 static struct i2c_driver i2c_driver_videotext =
 160 {
 161         .driver = {
 162                 .name   = IF_NAME,              /* name */
 163         },
 164         .id             = I2C_DRIVERID_SAA5249, /* in i2c.h */
 165         .attach_adapter = saa5246a_probe,
 166         .detach_client  = saa5246a_detach,
 167 };
 168
 169 static struct i2c_client client_template = {
 170         .driver         = &i2c_driver_videotext,
 171         .name           = "(unset)",
 172 };
 173
 174 static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
 175 {
 176         char buf[64];
 177
 178         buf[0] = reg;
 179         memcpy(buf+1, data, count);
 180
 181         if(i2c_master_send(t->client, buf, count+1)==count+1)
 182                 return 0;
 183         return -1;
 184 }
 185
 186 static int i2c_senddata(struct saa5246a_device *t, ...)
 187 {
 188         unsigned char buf[64];
 189         int v;
 190         int ct=0;
 191         va_list argp;
 192         va_start(argp,t);
 193
 194         while((v=va_arg(argp,int))!=-1)
 195                 buf[ct++]=v;
 196         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 197 }
 198
 199 /* Get count number of bytes from I²C-device at address adr, store them in buf.
 200  * Start & stop handshaking is done by this routine, ack will be sent after the
 201  * last byte to inhibit further sending of data. If uaccess is TRUE, data is
 202  * written to user-space with put_user. Returns -1 if I²C-device didn't send
 203  * acknowledge, 0 otherwise
 204  */
 205 static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
 206 {
 207         if(i2c_master_recv(t->client, buf, count)!=count)
 208                 return -1;
 209         return 0;
 210 }
 211
 212 /* When a page is found then the not FOUND bit in one of the status registers
 213  * of the SAA5264A chip is cleared. Unfortunately this bit is not set
 214  * automatically when a new page is requested. Instead this function must be
 215  * called after a page has been requested.
 216  *
 217  * Return value: 0 if successful
 218  */
 219 static int saa5246a_clear_found_bit(struct saa5246a_device *t,
 220         unsigned char dau_no)
 221 {
 222         unsigned char row_25_column_8;
 223
 224         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 225
 226                 dau_no |
 227                 R8_DO_NOT_CLEAR_MEMORY,
 228
 229                 R9_CURSER_ROW_25,
 230
 231                 R10_CURSER_COLUMN_8,
 232
 233                 COMMAND_END) ||
 234                 i2c_getdata(t, 1, &row_25_column_8))
 235         {
 236                 return -EIO;
 237         }
 238         row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
 239         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 240
 241                 dau_no |
 242                 R8_DO_NOT_CLEAR_MEMORY,
 243
 244                 R9_CURSER_ROW_25,
 245
 246                 R10_CURSER_COLUMN_8,
 247
 248                 row_25_column_8,
 249
 250                 COMMAND_END))
 251         {
 252                 return -EIO;
 253         }
 254
 255         return 0;
 256 }
 257
 258 /* Requests one videotext page as described in req. The fields of req are
 259  * checked and an error is returned if something is invalid.
 260  *
 261  * Return value: 0 if successful
 262  */
 263 static int saa5246a_request_page(struct saa5246a_device *t,
 264     vtx_pagereq_t *req)
 265 {
 266         if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
 267                 return -EINVAL;
 268         if (req->pagemask & PGMASK_PAGE)
 269                 if (req->page < 0 || req->page > PAGE_MAX)
 270                         return -EINVAL;
 271         if (req->pagemask & PGMASK_HOUR)
 272                 if (req->hour < 0 || req->hour > HOUR_MAX)
 273                         return -EINVAL;
 274         if (req->pagemask & PGMASK_MINUTE)
 275                 if (req->minute < 0 || req->minute > MINUTE_MAX)
 276                         return -EINVAL;
 277         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 278                 return -EINVAL;
 279
 280         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 281
 282                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 283                 req->pgbuf << 4 |
 284                 R2_BANK_0 |
 285                 R2_HAMMING_CHECK_OFF,
 286
 287                 HUNDREDS_OF_PAGE(req->page) |
 288                 R3_HOLD_PAGE |
 289                 (req->pagemask & PG_HUND ?
 290                         R3_PAGE_HUNDREDS_DO_CARE :
 291                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 292
 293                 TENS_OF_PAGE(req->page) |
 294                 (req->pagemask & PG_TEN ?
 295                         R3_PAGE_TENS_DO_CARE :
 296                         R3_PAGE_TENS_DO_NOT_CARE),
 297
 298                 UNITS_OF_PAGE(req->page) |
 299                 (req->pagemask & PG_UNIT ?
 300                         R3_PAGE_UNITS_DO_CARE :
 301                         R3_PAGE_UNITS_DO_NOT_CARE),
 302
 303                 TENS_OF_HOUR(req->hour) |
 304                 (req->pagemask & HR_TEN ?
 305                         R3_HOURS_TENS_DO_CARE :
 306                         R3_HOURS_TENS_DO_NOT_CARE),
 307
 308                 UNITS_OF_HOUR(req->hour) |
 309                 (req->pagemask & HR_UNIT ?
 310                         R3_HOURS_UNITS_DO_CARE :
 311                         R3_HOURS_UNITS_DO_NOT_CARE),
 312
 313                 TENS_OF_MINUTE(req->minute) |
 314                 (req->pagemask & MIN_TEN ?
 315                         R3_MINUTES_TENS_DO_CARE :
 316                         R3_MINUTES_TENS_DO_NOT_CARE),
 317
 318                 UNITS_OF_MINUTE(req->minute) |
 319                 (req->pagemask & MIN_UNIT ?
 320                         R3_MINUTES_UNITS_DO_CARE :
 321                         R3_MINUTES_UNITS_DO_NOT_CARE),
 322
 323                 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
 324
 325                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 326                 req->pgbuf << 4 |
 327                 R2_BANK_0 |
 328                 R2_HAMMING_CHECK_OFF,
 329
 330                 HUNDREDS_OF_PAGE(req->page) |
 331                 R3_UPDATE_PAGE |
 332                 (req->pagemask & PG_HUND ?
 333                         R3_PAGE_HUNDREDS_DO_CARE :
 334                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 335
 336                 COMMAND_END))
 337         {
 338                 return -EIO;
 339         }
 340
 341         t->is_searching[req->pgbuf] = TRUE;
 342         return 0;
 343 }
 344
 345 /* This routine decodes the page number from the infobits contained in line 25.
 346  *
 347  * Parameters:
 348  * infobits: must be bits 0 to 9 of column 25
 349  *
 350  * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
 351  */
 352 static inline int saa5246a_extract_pagenum_from_infobits(
 353     unsigned char infobits[10])
 354 {
 355         int page_hundreds, page_tens, page_units;
 356
 357         page_units    = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
 358         page_tens     = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
 359         page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
 360
 361         /* page 0x.. means page 8.. */
 362         if (page_hundreds == 0)
 363                 page_hundreds = 8;
 364
 365         return((page_hundreds << 8) | (page_tens << 4) | page_units);
 366 }
 367
 368 /* Decodes the hour from the infobits contained in line 25.
 369  *
 370  * Parameters:
 371  * infobits: must be bits 0 to 9 of column 25
 372  *
 373  * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
 374  */
 375 static inline int saa5246a_extract_hour_from_infobits(
 376     unsigned char infobits[10])
 377 {
 378         int hour_tens, hour_units;
 379
 380         hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
 381         hour_tens  = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
 382
 383         return((hour_tens << 4) | hour_units);
 384 }
 385
 386 /* Decodes the minutes from the infobits contained in line 25.
 387  *
 388  * Parameters:
 389  * infobits: must be bits 0 to 9 of column 25
 390  *
 391  * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
 392  */
 393 static inline int saa5246a_extract_minutes_from_infobits(
 394     unsigned char infobits[10])
 395 {
 396         int minutes_tens, minutes_units;
 397
 398         minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
 399         minutes_tens  = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
 400
 401         return((minutes_tens << 4) | minutes_units);
 402 }
 403
 404 /* Reads the status bits contained in the first 10 columns of the first line
 405  * and extracts the information into info.
 406  *
 407  * Return value: 0 if successful
 408  */
 409 static inline int saa5246a_get_status(struct saa5246a_device *t,
 410     vtx_pageinfo_t *info, unsigned char dau_no)
 411 {
 412         unsigned char infobits[10];
 413         int column;
 414
 415         if (dau_no >= NUM_DAUS)
 416                 return -EINVAL;
 417
 418         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 419
 420                 dau_no |
 421                 R8_DO_NOT_CLEAR_MEMORY,
 422
 423                 R9_CURSER_ROW_25,
 424
 425                 R10_CURSER_COLUMN_0,
 426
 427                 COMMAND_END) ||
 428                 i2c_getdata(t, 10, infobits))
 429         {
 430                 return -EIO;
 431         }
 432
 433         info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
 434         info->hour    = saa5246a_extract_hour_from_infobits(infobits);
 435         info->minute  = saa5246a_extract_minutes_from_infobits(infobits);
 436         info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
 437         info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
 438         info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
 439         info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
 440         info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
 441         info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
 442         info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
 443         info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
 444         info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
 445         info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
 446         info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
 447         info->hamming = 0;
 448         for (column = 0; column <= 7; column++) {
 449                 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
 450                         info->hamming = 1;
 451                         break;
 452                 }
 453         }
 454         if (!info->hamming && !info->notfound)
 455                 t->is_searching[dau_no] = FALSE;
 456         return 0;
 457 }
 458
 459 /* Reads 1 videotext page buffer of the SAA5246A.
 460  *
 461  * req is used both as input and as output. It contains information which part
 462  * must be read. The videotext page is copied into req->buffer.
 463  *
 464  * Return value: 0 if successful
 465  */
 466 static inline int saa5246a_get_page(struct saa5246a_device *t,
 467         vtx_pagereq_t *req)
 468 {
 469         int start, end, size;
 470         char *buf;
 471         int err;
 472
 473         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
 474             req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
 475                 return -EINVAL;
 476
 477         buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
 478         if (!buf)
 479                 return -ENOMEM;
 480
 481         /* Read "normal" part of page */
 482         err = -EIO;
 483
 484         end = min(req->end, VTX_PAGESIZE - 1);
 485         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 486                         req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
 487                         ROW(req->start), COLUMN(req->start), COMMAND_END))
 488                 goto out;
 489         if (i2c_getdata(t, end - req->start + 1, buf))
 490                 goto out;
 491         err = -EFAULT;
 492         if (copy_to_user(req->buffer, buf, end - req->start + 1))
 493                 goto out;
 494
 495         /* Always get the time from buffer 4, since this stupid SAA5246A only
 496          * updates the currently displayed buffer...
 497          */
 498         if (REQ_CONTAINS_TIME(req)) {
 499                 start = max(req->start, POS_TIME_START);
 500                 end   = min(req->end,   POS_TIME_END);
 501                 size = end - start + 1;
 502                 err = -EINVAL;
 503                 if (size < 0)
 504                         goto out;
 505                 err = -EIO;
 506                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 507                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 508                                 R9_CURSER_ROW_0, start, COMMAND_END))
 509                         goto out;
 510                 if (i2c_getdata(t, size, buf))
 511                         goto out;
 512                 err = -EFAULT;
 513                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 514                         goto out;
 515         }
 516         /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
 517         if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
 518                 start = max(req->start, POS_HEADER_START);
 519                 end   = min(req->end,   POS_HEADER_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, end - start + 1, buf))
 530                         goto out;
 531                 err = -EFAULT;
 532                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 533                         goto out;
 534         }
 535         err = 0;
 536 out:
 537         kfree(buf);
 538         return err;
 539 }
 540
 541 /* Stops the acquisition circuit given in dau_no. The page buffer associated
 542  * with this acquisition circuit will no more be updated. The other daus are
 543  * not affected.
 544  *
 545  * Return value: 0 if successful
 546  */
 547 static inline int saa5246a_stop_dau(struct saa5246a_device *t,
 548     unsigned char dau_no)
 549 {
 550         if (dau_no >= NUM_DAUS)
 551                 return -EINVAL;
 552         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 553
 554                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 555                 dau_no << 4 |
 556                 R2_BANK_0 |
 557                 R2_HAMMING_CHECK_OFF,
 558
 559                 R3_PAGE_HUNDREDS_0 |
 560                 R3_HOLD_PAGE |
 561                 R3_PAGE_HUNDREDS_DO_NOT_CARE,
 562
 563                 COMMAND_END))
 564         {
 565                 return -EIO;
 566         }
 567         t->is_searching[dau_no] = FALSE;
 568         return 0;
 569 }
 570
 571 /*  Handles ioctls defined in videotext.h
 572  *
 573  *  Returns 0 if successful
 574  */
 575 static int do_saa5246a_ioctl(struct inode *inode, struct file *file,
 576                             unsigned int cmd, void *arg)
 577 {
 578         struct video_device *vd = video_devdata(file);
 579         struct saa5246a_device *t=vd->priv;
 580         switch(cmd)
 581         {
 582                 case VTXIOCGETINFO:
 583                 {
 584                         vtx_info_t *info = arg;
 585
 586                         info->version_major = MAJOR_VERSION;
 587                         info->version_minor = MINOR_VERSION;
 588                         info->numpages = NUM_DAUS;
 589                         return 0;
 590                 }
 591
 592                 case VTXIOCCLRPAGE:
 593                 {
 594                         vtx_pagereq_t *req = arg;
 595
 596                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 597                                 return -EINVAL;
 598                         memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0]));
 599                         return 0;
 600                 }
 601
 602                 case VTXIOCCLRFOUND:
 603                 {
 604                         vtx_pagereq_t *req = arg;
 605
 606                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 607                                 return -EINVAL;
 608                         return(saa5246a_clear_found_bit(t, req->pgbuf));
 609                 }
 610
 611                 case VTXIOCPAGEREQ:
 612                 {
 613                         vtx_pagereq_t *req = arg;
 614
 615                         return(saa5246a_request_page(t, req));
 616                 }
 617
 618                 case VTXIOCGETSTAT:
 619                 {
 620                         vtx_pagereq_t *req = arg;
 621                         vtx_pageinfo_t info;
 622                         int rval;
 623
 624                         if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
 625                                 return rval;
 626                         if(copy_to_user(req->buffer, &info,
 627                                 sizeof(vtx_pageinfo_t)))
 628                                 return -EFAULT;
 629                         return 0;
 630                 }
 631
 632                 case VTXIOCGETPAGE:
 633                 {
 634                         vtx_pagereq_t *req = arg;
 635
 636                         return(saa5246a_get_page(t, req));
 637                 }
 638
 639                 case VTXIOCSTOPDAU:
 640                 {
 641                         vtx_pagereq_t *req = arg;
 642
 643                         return(saa5246a_stop_dau(t, req->pgbuf));
 644                 }
 645
 646                 case VTXIOCPUTPAGE:
 647                 case VTXIOCSETDISP:
 648                 case VTXIOCPUTSTAT:
 649                         return 0;
 650
 651                 case VTXIOCCLRCACHE:
 652                 {
 653                         return 0;
 654                 }
 655
 656                 case VTXIOCSETVIRT:
 657                 {
 658                         /* I do not know what "virtual mode" means */
 659                         return 0;
 660                 }
 661         }
 662         return -EINVAL;
 663 }
 664
 665 /*
 666  * Translates old vtx IOCTLs to new ones
 667  *
 668  * This keeps new kernel versions compatible with old userspace programs.
 669  */
 670 static inline unsigned int vtx_fix_command(unsigned int cmd)
 671 {
 672         switch (cmd) {
 673         case VTXIOCGETINFO_OLD:
 674                 cmd = VTXIOCGETINFO;
 675                 break;
 676         case VTXIOCCLRPAGE_OLD:
 677                 cmd = VTXIOCCLRPAGE;
 678                 break;
 679         case VTXIOCCLRFOUND_OLD:
 680                 cmd = VTXIOCCLRFOUND;
 681                 break;
 682         case VTXIOCPAGEREQ_OLD:
 683                 cmd = VTXIOCPAGEREQ;
 684                 break;
 685         case VTXIOCGETSTAT_OLD:
 686                 cmd = VTXIOCGETSTAT;
 687                 break;
 688         case VTXIOCGETPAGE_OLD:
 689                 cmd = VTXIOCGETPAGE;
 690                 break;
 691         case VTXIOCSTOPDAU_OLD:
 692                 cmd = VTXIOCSTOPDAU;
 693                 break;
 694         case VTXIOCPUTPAGE_OLD:
 695                 cmd = VTXIOCPUTPAGE;
 696                 break;
 697         case VTXIOCSETDISP_OLD:
 698                 cmd = VTXIOCSETDISP;
 699                 break;
 700         case VTXIOCPUTSTAT_OLD:
 701                 cmd = VTXIOCPUTSTAT;
 702                 break;
 703         case VTXIOCCLRCACHE_OLD:
 704                 cmd = VTXIOCCLRCACHE;
 705                 break;
 706         case VTXIOCSETVIRT_OLD:
 707                 cmd = VTXIOCSETVIRT;
 708                 break;
 709         }
 710         return cmd;
 711 }
 712
 713 /*
 714  *      Handle the locking
 715  */
 716 static int saa5246a_ioctl(struct inode *inode, struct file *file,
 717                          unsigned int cmd, unsigned long arg)
 718 {
 719         struct video_device *vd = video_devdata(file);
 720         struct saa5246a_device *t = vd->priv;
 721         int err;
 722
 723         cmd = vtx_fix_command(cmd);
 724         mutex_lock(&t->lock);
 725         err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
 726         mutex_unlock(&t->lock);
 727         return err;
 728 }
 729
 730 static int saa5246a_open(struct inode *inode, struct file *file)
 731 {
 732         struct video_device *vd = video_devdata(file);
 733         struct saa5246a_device *t = vd->priv;
 734         int err;
 735
 736         err = video_exclusive_open(inode,file);
 737         if (err < 0)
 738                 return err;
 739
 740         if (t->client==NULL) {
 741                 err = -ENODEV;
 742                 goto fail;
 743         }
 744
 745         if (i2c_senddata(t, SAA5246A_REGISTER_R0,
 746
 747                 R0_SELECT_R11 |
 748                 R0_PLL_TIME_CONSTANT_LONG |
 749                 R0_ENABLE_nODD_EVEN_OUTPUT |
 750                 R0_ENABLE_HDR_POLL |
 751                 R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
 752                 R0_NO_FREE_RUN_PLL |
 753                 R0_NO_AUTOMATIC_FASTEXT_PROMPT,
 754
 755                 R1_NON_INTERLACED_312_312_LINES |
 756                 R1_DEW |
 757                 R1_EXTENDED_PACKET_DISABLE |
 758                 R1_DAUS_ALL_ON |
 759                 R1_8_BITS_NO_PARITY |
 760                 R1_VCS_TO_SCS,
 761
 762                 COMMAND_END) ||
 763                 i2c_senddata(t, SAA5246A_REGISTER_R4,
 764
 765                 /* We do not care much for the TV display but nevertheless we
 766                  * need the currently displayed page later because only on that
 767                  * page the time is updated. */
 768                 R4_DISPLAY_PAGE_4,
 769
 770                 COMMAND_END))
 771         {
 772                 err = -EIO;
 773                 goto fail;
 774         }
 775
 776         return 0;
 777
 778 fail:
 779         video_exclusive_release(inode,file);
 780         return err;
 781 }
 782
 783 static int saa5246a_release(struct inode *inode, struct file *file)
 784 {
 785         struct video_device *vd = video_devdata(file);
 786         struct saa5246a_device *t = vd->priv;
 787
 788         /* Stop all acquisition circuits. */
 789         i2c_senddata(t, SAA5246A_REGISTER_R1,
 790
 791                 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
 792                 R1_DEW |
 793                 R1_EXTENDED_PACKET_DISABLE |
 794                 R1_DAUS_ALL_OFF |
 795                 R1_8_BITS_NO_PARITY |
 796                 R1_VCS_TO_SCS,
 797
 798                 COMMAND_END);
 799         video_exclusive_release(inode,file);
 800         return 0;
 801 }
 802
 803 static int __init init_saa_5246a (void)
 804 {
 805         printk(KERN_INFO
 806                 "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
 807                 MAJOR_VERSION, MINOR_VERSION);
 808         return i2c_add_driver(&i2c_driver_videotext);
 809 }
 810
 811 static void __exit cleanup_saa_5246a (void)
 812 {
 813         i2c_del_driver(&i2c_driver_videotext);
 814 }
 815
 816 module_init(init_saa_5246a);
 817 module_exit(cleanup_saa_5246a);
 818
 819 static struct file_operations saa_fops = {
 820         .owner   = THIS_MODULE,
 821         .open    = saa5246a_open,
 822         .release = saa5246a_release,
 823         .ioctl   = saa5246a_ioctl,
 824         .llseek  = no_llseek,
 825 };
 826
 827 static struct video_device saa_template =
 828 {
 829         .owner    = THIS_MODULE,
 830         .name     = IF_NAME,
 831         .type     = VID_TYPE_TELETEXT,
 832         .hardware = VID_HARDWARE_SAA5249,
 833         .fops     = &saa_fops,
 834         .release  = video_device_release,
 835         .minor    = -1,
 836 };