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/mm.h>
  44 #include <linux/init.h>
  45 #include <linux/i2c.h>
  46 #include <linux/videotext.h>
  47 #include <linux/videodev.h>
  48 #include <media/v4l2-common.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
  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
 198         va_end(argp);
 199         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 200 }
 201
 202 /* Get count number of bytes from I²C-device at address adr, store them in buf.
 203  * Start & stop handshaking is done by this routine, ack will be sent after the
 204  * last byte to inhibit further sending of data. If uaccess is 'true', data is
 205  * written to user-space with put_user. Returns -1 if I²C-device didn't send
 206  * acknowledge, 0 otherwise
 207  */
 208 static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
 209 {
 210         if(i2c_master_recv(t->client, buf, count)!=count)
 211                 return -1;
 212         return 0;
 213 }
 214
 215 /* When a page is found then the not FOUND bit in one of the status registers
 216  * of the SAA5264A chip is cleared. Unfortunately this bit is not set
 217  * automatically when a new page is requested. Instead this function must be
 218  * called after a page has been requested.
 219  *
 220  * Return value: 0 if successful
 221  */
 222 static int saa5246a_clear_found_bit(struct saa5246a_device *t,
 223         unsigned char dau_no)
 224 {
 225         unsigned char row_25_column_8;
 226
 227         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 228
 229                 dau_no |
 230                 R8_DO_NOT_CLEAR_MEMORY,
 231
 232                 R9_CURSER_ROW_25,
 233
 234                 R10_CURSER_COLUMN_8,
 235
 236                 COMMAND_END) ||
 237                 i2c_getdata(t, 1, &row_25_column_8))
 238         {
 239                 return -EIO;
 240         }
 241         row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
 242         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 243
 244                 dau_no |
 245                 R8_DO_NOT_CLEAR_MEMORY,
 246
 247                 R9_CURSER_ROW_25,
 248
 249                 R10_CURSER_COLUMN_8,
 250
 251                 row_25_column_8,
 252
 253                 COMMAND_END))
 254         {
 255                 return -EIO;
 256         }
 257
 258         return 0;
 259 }
 260
 261 /* Requests one videotext page as described in req. The fields of req are
 262  * checked and an error is returned if something is invalid.
 263  *
 264  * Return value: 0 if successful
 265  */
 266 static int saa5246a_request_page(struct saa5246a_device *t,
 267     vtx_pagereq_t *req)
 268 {
 269         if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
 270                 return -EINVAL;
 271         if (req->pagemask & PGMASK_PAGE)
 272                 if (req->page < 0 || req->page > PAGE_MAX)
 273                         return -EINVAL;
 274         if (req->pagemask & PGMASK_HOUR)
 275                 if (req->hour < 0 || req->hour > HOUR_MAX)
 276                         return -EINVAL;
 277         if (req->pagemask & PGMASK_MINUTE)
 278                 if (req->minute < 0 || req->minute > MINUTE_MAX)
 279                         return -EINVAL;
 280         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 281                 return -EINVAL;
 282
 283         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 284
 285                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 286                 req->pgbuf << 4 |
 287                 R2_BANK_0 |
 288                 R2_HAMMING_CHECK_OFF,
 289
 290                 HUNDREDS_OF_PAGE(req->page) |
 291                 R3_HOLD_PAGE |
 292                 (req->pagemask & PG_HUND ?
 293                         R3_PAGE_HUNDREDS_DO_CARE :
 294                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 295
 296                 TENS_OF_PAGE(req->page) |
 297                 (req->pagemask & PG_TEN ?
 298                         R3_PAGE_TENS_DO_CARE :
 299                         R3_PAGE_TENS_DO_NOT_CARE),
 300
 301                 UNITS_OF_PAGE(req->page) |
 302                 (req->pagemask & PG_UNIT ?
 303                         R3_PAGE_UNITS_DO_CARE :
 304                         R3_PAGE_UNITS_DO_NOT_CARE),
 305
 306                 TENS_OF_HOUR(req->hour) |
 307                 (req->pagemask & HR_TEN ?
 308                         R3_HOURS_TENS_DO_CARE :
 309                         R3_HOURS_TENS_DO_NOT_CARE),
 310
 311                 UNITS_OF_HOUR(req->hour) |
 312                 (req->pagemask & HR_UNIT ?
 313                         R3_HOURS_UNITS_DO_CARE :
 314                         R3_HOURS_UNITS_DO_NOT_CARE),
 315
 316                 TENS_OF_MINUTE(req->minute) |
 317                 (req->pagemask & MIN_TEN ?
 318                         R3_MINUTES_TENS_DO_CARE :
 319                         R3_MINUTES_TENS_DO_NOT_CARE),
 320
 321                 UNITS_OF_MINUTE(req->minute) |
 322                 (req->pagemask & MIN_UNIT ?
 323                         R3_MINUTES_UNITS_DO_CARE :
 324                         R3_MINUTES_UNITS_DO_NOT_CARE),
 325
 326                 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
 327
 328                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 329                 req->pgbuf << 4 |
 330                 R2_BANK_0 |
 331                 R2_HAMMING_CHECK_OFF,
 332
 333                 HUNDREDS_OF_PAGE(req->page) |
 334                 R3_UPDATE_PAGE |
 335                 (req->pagemask & PG_HUND ?
 336                         R3_PAGE_HUNDREDS_DO_CARE :
 337                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 338
 339                 COMMAND_END))
 340         {
 341                 return -EIO;
 342         }
 343
 344         t->is_searching[req->pgbuf] = true;
 345         return 0;
 346 }
 347
 348 /* This routine decodes the page number from the infobits contained in line 25.
 349  *
 350  * Parameters:
 351  * infobits: must be bits 0 to 9 of column 25
 352  *
 353  * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
 354  */
 355 static inline int saa5246a_extract_pagenum_from_infobits(
 356     unsigned char infobits[10])
 357 {
 358         int page_hundreds, page_tens, page_units;
 359
 360         page_units    = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
 361         page_tens     = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
 362         page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
 363
 364         /* page 0x.. means page 8.. */
 365         if (page_hundreds == 0)
 366                 page_hundreds = 8;
 367
 368         return((page_hundreds << 8) | (page_tens << 4) | page_units);
 369 }
 370
 371 /* Decodes the hour from the infobits contained in line 25.
 372  *
 373  * Parameters:
 374  * infobits: must be bits 0 to 9 of column 25
 375  *
 376  * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
 377  */
 378 static inline int saa5246a_extract_hour_from_infobits(
 379     unsigned char infobits[10])
 380 {
 381         int hour_tens, hour_units;
 382
 383         hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
 384         hour_tens  = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
 385
 386         return((hour_tens << 4) | hour_units);
 387 }
 388
 389 /* Decodes the minutes from the infobits contained in line 25.
 390  *
 391  * Parameters:
 392  * infobits: must be bits 0 to 9 of column 25
 393  *
 394  * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
 395  */
 396 static inline int saa5246a_extract_minutes_from_infobits(
 397     unsigned char infobits[10])
 398 {
 399         int minutes_tens, minutes_units;
 400
 401         minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
 402         minutes_tens  = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
 403
 404         return((minutes_tens << 4) | minutes_units);
 405 }
 406
 407 /* Reads the status bits contained in the first 10 columns of the first line
 408  * and extracts the information into info.
 409  *
 410  * Return value: 0 if successful
 411  */
 412 static inline int saa5246a_get_status(struct saa5246a_device *t,
 413     vtx_pageinfo_t *info, unsigned char dau_no)
 414 {
 415         unsigned char infobits[10];
 416         int column;
 417
 418         if (dau_no >= NUM_DAUS)
 419                 return -EINVAL;
 420
 421         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 422
 423                 dau_no |
 424                 R8_DO_NOT_CLEAR_MEMORY,
 425
 426                 R9_CURSER_ROW_25,
 427
 428                 R10_CURSER_COLUMN_0,
 429
 430                 COMMAND_END) ||
 431                 i2c_getdata(t, 10, infobits))
 432         {
 433                 return -EIO;
 434         }
 435
 436         info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
 437         info->hour    = saa5246a_extract_hour_from_infobits(infobits);
 438         info->minute  = saa5246a_extract_minutes_from_infobits(infobits);
 439         info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
 440         info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
 441         info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
 442         info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
 443         info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
 444         info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
 445         info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
 446         info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
 447         info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
 448         info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
 449         info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
 450         info->hamming = 0;
 451         for (column = 0; column <= 7; column++) {
 452                 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
 453                         info->hamming = 1;
 454                         break;
 455                 }
 456         }
 457         if (!info->hamming && !info->notfound)
 458                 t->is_searching[dau_no] = false;
 459         return 0;
 460 }
 461
 462 /* Reads 1 videotext page buffer of the SAA5246A.
 463  *
 464  * req is used both as input and as output. It contains information which part
 465  * must be read. The videotext page is copied into req->buffer.
 466  *
 467  * Return value: 0 if successful
 468  */
 469 static inline int saa5246a_get_page(struct saa5246a_device *t,
 470         vtx_pagereq_t *req)
 471 {
 472         int start, end, size;
 473         char *buf;
 474         int err;
 475
 476         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
 477             req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
 478                 return -EINVAL;
 479
 480         buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
 481         if (!buf)
 482                 return -ENOMEM;
 483
 484         /* Read "normal" part of page */
 485         err = -EIO;
 486
 487         end = min(req->end, VTX_PAGESIZE - 1);
 488         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 489                         req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
 490                         ROW(req->start), COLUMN(req->start), COMMAND_END))
 491                 goto out;
 492         if (i2c_getdata(t, end - req->start + 1, buf))
 493                 goto out;
 494         err = -EFAULT;
 495         if (copy_to_user(req->buffer, buf, end - req->start + 1))
 496                 goto out;
 497
 498         /* Always get the time from buffer 4, since this stupid SAA5246A only
 499          * updates the currently displayed buffer...
 500          */
 501         if (REQ_CONTAINS_TIME(req)) {
 502                 start = max(req->start, POS_TIME_START);
 503                 end   = min(req->end,   POS_TIME_END);
 504                 size = end - start + 1;
 505                 err = -EINVAL;
 506                 if (size < 0)
 507                         goto out;
 508                 err = -EIO;
 509                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 510                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 511                                 R9_CURSER_ROW_0, start, COMMAND_END))
 512                         goto out;
 513                 if (i2c_getdata(t, size, buf))
 514                         goto out;
 515                 err = -EFAULT;
 516                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 517                         goto out;
 518         }
 519         /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
 520         if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
 521                 start = max(req->start, POS_HEADER_START);
 522                 end   = min(req->end,   POS_HEADER_END);
 523                 size = end - start + 1;
 524                 err = -EINVAL;
 525                 if (size < 0)
 526                         goto out;
 527                 err = -EIO;
 528                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 529                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 530                                 R9_CURSER_ROW_0, start, COMMAND_END))
 531                         goto out;
 532                 if (i2c_getdata(t, end - start + 1, buf))
 533                         goto out;
 534                 err = -EFAULT;
 535                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 536                         goto out;
 537         }
 538         err = 0;
 539 out:
 540         kfree(buf);
 541         return err;
 542 }
 543
 544 /* Stops the acquisition circuit given in dau_no. The page buffer associated
 545  * with this acquisition circuit will no more be updated. The other daus are
 546  * not affected.
 547  *
 548  * Return value: 0 if successful
 549  */
 550 static inline int saa5246a_stop_dau(struct saa5246a_device *t,
 551     unsigned char dau_no)
 552 {
 553         if (dau_no >= NUM_DAUS)
 554                 return -EINVAL;
 555         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 556
 557                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 558                 dau_no << 4 |
 559                 R2_BANK_0 |
 560                 R2_HAMMING_CHECK_OFF,
 561
 562                 R3_PAGE_HUNDREDS_0 |
 563                 R3_HOLD_PAGE |
 564                 R3_PAGE_HUNDREDS_DO_NOT_CARE,
 565
 566                 COMMAND_END))
 567         {
 568                 return -EIO;
 569         }
 570         t->is_searching[dau_no] = false;
 571         return 0;
 572 }
 573
 574 /*  Handles ioctls defined in videotext.h
 575  *
 576  *  Returns 0 if successful
 577  */
 578 static int do_saa5246a_ioctl(struct inode *inode, struct file *file,
 579                             unsigned int cmd, void *arg)
 580 {
 581         struct video_device *vd = video_devdata(file);
 582         struct saa5246a_device *t=vd->priv;
 583         switch(cmd)
 584         {
 585                 case VTXIOCGETINFO:
 586                 {
 587                         vtx_info_t *info = arg;
 588
 589                         info->version_major = MAJOR_VERSION;
 590                         info->version_minor = MINOR_VERSION;
 591                         info->numpages = NUM_DAUS;
 592                         return 0;
 593                 }
 594
 595                 case VTXIOCCLRPAGE:
 596                 {
 597                         vtx_pagereq_t *req = arg;
 598
 599                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 600                                 return -EINVAL;
 601                         memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0]));
 602                         return 0;
 603                 }
 604
 605                 case VTXIOCCLRFOUND:
 606                 {
 607                         vtx_pagereq_t *req = arg;
 608
 609                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 610                                 return -EINVAL;
 611                         return(saa5246a_clear_found_bit(t, req->pgbuf));
 612                 }
 613
 614                 case VTXIOCPAGEREQ:
 615                 {
 616                         vtx_pagereq_t *req = arg;
 617
 618                         return(saa5246a_request_page(t, req));
 619                 }
 620
 621                 case VTXIOCGETSTAT:
 622                 {
 623                         vtx_pagereq_t *req = arg;
 624                         vtx_pageinfo_t info;
 625                         int rval;
 626
 627                         if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
 628                                 return rval;
 629                         if(copy_to_user(req->buffer, &info,
 630                                 sizeof(vtx_pageinfo_t)))
 631                                 return -EFAULT;
 632                         return 0;
 633                 }
 634
 635                 case VTXIOCGETPAGE:
 636                 {
 637                         vtx_pagereq_t *req = arg;
 638
 639                         return(saa5246a_get_page(t, req));
 640                 }
 641
 642                 case VTXIOCSTOPDAU:
 643                 {
 644                         vtx_pagereq_t *req = arg;
 645
 646                         return(saa5246a_stop_dau(t, req->pgbuf));
 647                 }
 648
 649                 case VTXIOCPUTPAGE:
 650                 case VTXIOCSETDISP:
 651                 case VTXIOCPUTSTAT:
 652                         return 0;
 653
 654                 case VTXIOCCLRCACHE:
 655                 {
 656                         return 0;
 657                 }
 658
 659                 case VTXIOCSETVIRT:
 660                 {
 661                         /* I do not know what "virtual mode" means */
 662                         return 0;
 663                 }
 664         }
 665         return -EINVAL;
 666 }
 667
 668 /*
 669  * Translates old vtx IOCTLs to new ones
 670  *
 671  * This keeps new kernel versions compatible with old userspace programs.
 672  */
 673 static inline unsigned int vtx_fix_command(unsigned int cmd)
 674 {
 675         switch (cmd) {
 676         case VTXIOCGETINFO_OLD:
 677                 cmd = VTXIOCGETINFO;
 678                 break;
 679         case VTXIOCCLRPAGE_OLD:
 680                 cmd = VTXIOCCLRPAGE;
 681                 break;
 682         case VTXIOCCLRFOUND_OLD:
 683                 cmd = VTXIOCCLRFOUND;
 684                 break;
 685         case VTXIOCPAGEREQ_OLD:
 686                 cmd = VTXIOCPAGEREQ;
 687                 break;
 688         case VTXIOCGETSTAT_OLD:
 689                 cmd = VTXIOCGETSTAT;
 690                 break;
 691         case VTXIOCGETPAGE_OLD:
 692                 cmd = VTXIOCGETPAGE;
 693                 break;
 694         case VTXIOCSTOPDAU_OLD:
 695                 cmd = VTXIOCSTOPDAU;
 696                 break;
 697         case VTXIOCPUTPAGE_OLD:
 698                 cmd = VTXIOCPUTPAGE;
 699                 break;
 700         case VTXIOCSETDISP_OLD:
 701                 cmd = VTXIOCSETDISP;
 702                 break;
 703         case VTXIOCPUTSTAT_OLD:
 704                 cmd = VTXIOCPUTSTAT;
 705                 break;
 706         case VTXIOCCLRCACHE_OLD:
 707                 cmd = VTXIOCCLRCACHE;
 708                 break;
 709         case VTXIOCSETVIRT_OLD:
 710                 cmd = VTXIOCSETVIRT;
 711                 break;
 712         }
 713         return cmd;
 714 }
 715
 716 /*
 717  *      Handle the locking
 718  */
 719 static int saa5246a_ioctl(struct inode *inode, struct file *file,
 720                          unsigned int cmd, unsigned long arg)
 721 {
 722         struct video_device *vd = video_devdata(file);
 723         struct saa5246a_device *t = vd->priv;
 724         int err;
 725
 726         cmd = vtx_fix_command(cmd);
 727         mutex_lock(&t->lock);
 728         err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
 729         mutex_unlock(&t->lock);
 730         return err;
 731 }
 732
 733 static int saa5246a_open(struct inode *inode, struct file *file)
 734 {
 735         struct video_device *vd = video_devdata(file);
 736         struct saa5246a_device *t = vd->priv;
 737         int err;
 738
 739         err = video_exclusive_open(inode,file);
 740         if (err < 0)
 741                 return err;
 742
 743         if (t->client==NULL) {
 744                 err = -ENODEV;
 745                 goto fail;
 746         }
 747
 748         if (i2c_senddata(t, SAA5246A_REGISTER_R0,
 749
 750                 R0_SELECT_R11 |
 751                 R0_PLL_TIME_CONSTANT_LONG |
 752                 R0_ENABLE_nODD_EVEN_OUTPUT |
 753                 R0_ENABLE_HDR_POLL |
 754                 R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
 755                 R0_NO_FREE_RUN_PLL |
 756                 R0_NO_AUTOMATIC_FASTEXT_PROMPT,
 757
 758                 R1_NON_INTERLACED_312_312_LINES |
 759                 R1_DEW |
 760                 R1_EXTENDED_PACKET_DISABLE |
 761                 R1_DAUS_ALL_ON |
 762                 R1_8_BITS_NO_PARITY |
 763                 R1_VCS_TO_SCS,
 764
 765                 COMMAND_END) ||
 766                 i2c_senddata(t, SAA5246A_REGISTER_R4,
 767
 768                 /* We do not care much for the TV display but nevertheless we
 769                  * need the currently displayed page later because only on that
 770                  * page the time is updated. */
 771                 R4_DISPLAY_PAGE_4,
 772
 773                 COMMAND_END))
 774         {
 775                 err = -EIO;
 776                 goto fail;
 777         }
 778
 779         return 0;
 780
 781 fail:
 782         video_exclusive_release(inode,file);
 783         return err;
 784 }
 785
 786 static int saa5246a_release(struct inode *inode, struct file *file)
 787 {
 788         struct video_device *vd = video_devdata(file);
 789         struct saa5246a_device *t = vd->priv;
 790
 791         /* Stop all acquisition circuits. */
 792         i2c_senddata(t, SAA5246A_REGISTER_R1,
 793
 794                 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
 795                 R1_DEW |
 796                 R1_EXTENDED_PACKET_DISABLE |
 797                 R1_DAUS_ALL_OFF |
 798                 R1_8_BITS_NO_PARITY |
 799                 R1_VCS_TO_SCS,
 800
 801                 COMMAND_END);
 802         video_exclusive_release(inode,file);
 803         return 0;
 804 }
 805
 806 static int __init init_saa_5246a (void)
 807 {
 808         printk(KERN_INFO
 809                 "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
 810                 MAJOR_VERSION, MINOR_VERSION);
 811         return i2c_add_driver(&i2c_driver_videotext);
 812 }
 813
 814 static void __exit cleanup_saa_5246a (void)
 815 {
 816         i2c_del_driver(&i2c_driver_videotext);
 817 }
 818
 819 module_init(init_saa_5246a);
 820 module_exit(cleanup_saa_5246a);
 821
 822 static const struct file_operations saa_fops = {
 823         .owner   = THIS_MODULE,
 824         .open    = saa5246a_open,
 825         .release = saa5246a_release,
 826         .ioctl   = saa5246a_ioctl,
 827         .llseek  = no_llseek,
 828 };
 829
 830 static struct video_device saa_template =
 831 {
 832         .owner    = THIS_MODULE,
 833         .name     = IF_NAME,
 834         .type     = VID_TYPE_TELETEXT,
 835         .fops     = &saa_fops,
 836         .release  = video_device_release,
 837         .minor    = -1,
 838 };