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 static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };
  68 I2C_CLIENT_INSMOD;
  69
  70 static struct i2c_client client_template;
  71
  72 static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind)
  73 {
  74         int pgbuf;
  75         int err;
  76         struct i2c_client *client;
  77         struct video_device *vd;
  78         struct saa5246a_device *t;
  79
  80         printk(KERN_INFO "saa5246a: teletext chip found.\n");
  81         client=kmalloc(sizeof(*client), GFP_KERNEL);
  82         if(client==NULL)
  83                 return -ENOMEM;
  84         client_template.adapter = adap;
  85         client_template.addr = addr;
  86         memcpy(client, &client_template, sizeof(*client));
  87         t = kmalloc(sizeof(*t), GFP_KERNEL);
  88         if(t==NULL)
  89         {
  90                 kfree(client);
  91                 return -ENOMEM;
  92         }
  93         memset(t, 0, sizeof(*t));
  94         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
  95         init_MUTEX(&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 static int saa5246a_command(struct i2c_client *device, unsigned int cmd,
 156         void *arg)
 157 {
 158         return -EINVAL;
 159 }
 160
 161 /*
 162  *      I2C interfaces
 163  */
 164
 165 static struct i2c_driver i2c_driver_videotext =
 166 {
 167         .owner          = THIS_MODULE,
 168         .name           = IF_NAME,              /* name */
 169         .id             = I2C_DRIVERID_SAA5249, /* in i2c.h */
 170         .flags          = I2C_DF_NOTIFY,
 171         .attach_adapter = saa5246a_probe,
 172         .detach_client  = saa5246a_detach,
 173         .command        = saa5246a_command
 174 };
 175
 176 static struct i2c_client client_template = {
 177         .driver         = &i2c_driver_videotext,
 178         .name           = "(unset)",
 179 };
 180
 181 static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
 182 {
 183         char buf[64];
 184
 185         buf[0] = reg;
 186         memcpy(buf+1, data, count);
 187
 188         if(i2c_master_send(t->client, buf, count+1)==count+1)
 189                 return 0;
 190         return -1;
 191 }
 192
 193 static int i2c_senddata(struct saa5246a_device *t, ...)
 194 {
 195         unsigned char buf[64];
 196         int v;
 197         int ct=0;
 198         va_list argp;
 199         va_start(argp,t);
 200
 201         while((v=va_arg(argp,int))!=-1)
 202                 buf[ct++]=v;
 203         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 204 }
 205
 206 /* Get count number of bytes from I²C-device at address adr, store them in buf.
 207  * Start & stop handshaking is done by this routine, ack will be sent after the
 208  * last byte to inhibit further sending of data. If uaccess is TRUE, data is
 209  * written to user-space with put_user. Returns -1 if I²C-device didn't send
 210  * acknowledge, 0 otherwise
 211  */
 212 static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
 213 {
 214         if(i2c_master_recv(t->client, buf, count)!=count)
 215                 return -1;
 216         return 0;
 217 }
 218
 219 /* When a page is found then the not FOUND bit in one of the status registers
 220  * of the SAA5264A chip is cleared. Unfortunately this bit is not set
 221  * automatically when a new page is requested. Instead this function must be
 222  * called after a page has been requested.
 223  *
 224  * Return value: 0 if successful
 225  */
 226 static int saa5246a_clear_found_bit(struct saa5246a_device *t,
 227         unsigned char dau_no)
 228 {
 229         unsigned char row_25_column_8;
 230
 231         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 232
 233                 dau_no |
 234                 R8_DO_NOT_CLEAR_MEMORY,
 235
 236                 R9_CURSER_ROW_25,
 237
 238                 R10_CURSER_COLUMN_8,
 239
 240                 COMMAND_END) ||
 241                 i2c_getdata(t, 1, &row_25_column_8))
 242         {
 243                 return -EIO;
 244         }
 245         row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
 246         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 247
 248                 dau_no |
 249                 R8_DO_NOT_CLEAR_MEMORY,
 250
 251                 R9_CURSER_ROW_25,
 252
 253                 R10_CURSER_COLUMN_8,
 254
 255                 row_25_column_8,
 256
 257                 COMMAND_END))
 258         {
 259                 return -EIO;
 260         }
 261
 262         return 0;
 263 }
 264
 265 /* Requests one videotext page as described in req. The fields of req are
 266  * checked and an error is returned if something is invalid.
 267  *
 268  * Return value: 0 if successful
 269  */
 270 static int saa5246a_request_page(struct saa5246a_device *t,
 271     vtx_pagereq_t *req)
 272 {
 273         if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
 274                 return -EINVAL;
 275         if (req->pagemask & PGMASK_PAGE)
 276                 if (req->page < 0 || req->page > PAGE_MAX)
 277                         return -EINVAL;
 278         if (req->pagemask & PGMASK_HOUR)
 279                 if (req->hour < 0 || req->hour > HOUR_MAX)
 280                         return -EINVAL;
 281         if (req->pagemask & PGMASK_MINUTE)
 282                 if (req->minute < 0 || req->minute > MINUTE_MAX)
 283                         return -EINVAL;
 284         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 285                 return -EINVAL;
 286
 287         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 288
 289                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 290                 req->pgbuf << 4 |
 291                 R2_BANK_0 |
 292                 R2_HAMMING_CHECK_OFF,
 293
 294                 HUNDREDS_OF_PAGE(req->page) |
 295                 R3_HOLD_PAGE |
 296                 (req->pagemask & PG_HUND ?
 297                         R3_PAGE_HUNDREDS_DO_CARE :
 298                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 299
 300                 TENS_OF_PAGE(req->page) |
 301                 (req->pagemask & PG_TEN ?
 302                         R3_PAGE_TENS_DO_CARE :
 303                         R3_PAGE_TENS_DO_NOT_CARE),
 304
 305                 UNITS_OF_PAGE(req->page) |
 306                 (req->pagemask & PG_UNIT ?
 307                         R3_PAGE_UNITS_DO_CARE :
 308                         R3_PAGE_UNITS_DO_NOT_CARE),
 309
 310                 TENS_OF_HOUR(req->hour) |
 311                 (req->pagemask & HR_TEN ?
 312                         R3_HOURS_TENS_DO_CARE :
 313                         R3_HOURS_TENS_DO_NOT_CARE),
 314
 315                 UNITS_OF_HOUR(req->hour) |
 316                 (req->pagemask & HR_UNIT ?
 317                         R3_HOURS_UNITS_DO_CARE :
 318                         R3_HOURS_UNITS_DO_NOT_CARE),
 319
 320                 TENS_OF_MINUTE(req->minute) |
 321                 (req->pagemask & MIN_TEN ?
 322                         R3_MINUTES_TENS_DO_CARE :
 323                         R3_MINUTES_TENS_DO_NOT_CARE),
 324
 325                 UNITS_OF_MINUTE(req->minute) |
 326                 (req->pagemask & MIN_UNIT ?
 327                         R3_MINUTES_UNITS_DO_CARE :
 328                         R3_MINUTES_UNITS_DO_NOT_CARE),
 329
 330                 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
 331
 332                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 333                 req->pgbuf << 4 |
 334                 R2_BANK_0 |
 335                 R2_HAMMING_CHECK_OFF,
 336
 337                 HUNDREDS_OF_PAGE(req->page) |
 338                 R3_UPDATE_PAGE |
 339                 (req->pagemask & PG_HUND ?
 340                         R3_PAGE_HUNDREDS_DO_CARE :
 341                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 342
 343                 COMMAND_END))
 344         {
 345                 return -EIO;
 346         }
 347
 348         t->is_searching[req->pgbuf] = TRUE;
 349         return 0;
 350 }
 351
 352 /* This routine decodes the page number from the infobits contained in line 25.
 353  *
 354  * Parameters:
 355  * infobits: must be bits 0 to 9 of column 25
 356  *
 357  * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
 358  */
 359 static inline int saa5246a_extract_pagenum_from_infobits(
 360     unsigned char infobits[10])
 361 {
 362         int page_hundreds, page_tens, page_units;
 363
 364         page_units    = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
 365         page_tens     = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
 366         page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
 367
 368         /* page 0x.. means page 8.. */
 369         if (page_hundreds == 0)
 370                 page_hundreds = 8;
 371
 372         return((page_hundreds << 8) | (page_tens << 4) | page_units);
 373 }
 374
 375 /* Decodes the hour from the infobits contained in line 25.
 376  *
 377  * Parameters:
 378  * infobits: must be bits 0 to 9 of column 25
 379  *
 380  * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
 381  */
 382 static inline int saa5246a_extract_hour_from_infobits(
 383     unsigned char infobits[10])
 384 {
 385         int hour_tens, hour_units;
 386
 387         hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
 388         hour_tens  = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
 389
 390         return((hour_tens << 4) | hour_units);
 391 }
 392
 393 /* Decodes the minutes from the infobits contained in line 25.
 394  *
 395  * Parameters:
 396  * infobits: must be bits 0 to 9 of column 25
 397  *
 398  * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
 399  */
 400 static inline int saa5246a_extract_minutes_from_infobits(
 401     unsigned char infobits[10])
 402 {
 403         int minutes_tens, minutes_units;
 404
 405         minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
 406         minutes_tens  = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
 407
 408         return((minutes_tens << 4) | minutes_units);
 409 }
 410
 411 /* Reads the status bits contained in the first 10 columns of the first line
 412  * and extracts the information into info.
 413  *
 414  * Return value: 0 if successful
 415  */
 416 static inline int saa5246a_get_status(struct saa5246a_device *t,
 417     vtx_pageinfo_t *info, unsigned char dau_no)
 418 {
 419         unsigned char infobits[10];
 420         int column;
 421
 422         if (dau_no >= NUM_DAUS)
 423                 return -EINVAL;
 424
 425         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 426
 427                 dau_no |
 428                 R8_DO_NOT_CLEAR_MEMORY,
 429
 430                 R9_CURSER_ROW_25,
 431
 432                 R10_CURSER_COLUMN_0,
 433
 434                 COMMAND_END) ||
 435                 i2c_getdata(t, 10, infobits))
 436         {
 437                 return -EIO;
 438         }
 439
 440         info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
 441         info->hour    = saa5246a_extract_hour_from_infobits(infobits);
 442         info->minute  = saa5246a_extract_minutes_from_infobits(infobits);
 443         info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
 444         info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
 445         info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
 446         info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
 447         info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
 448         info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
 449         info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
 450         info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
 451         info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
 452         info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
 453         info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
 454         info->hamming = 0;
 455         for (column = 0; column <= 7; column++) {
 456                 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
 457                         info->hamming = 1;
 458                         break;
 459                 }
 460         }
 461         if (!info->hamming && !info->notfound)
 462                 t->is_searching[dau_no] = FALSE;
 463         return 0;
 464 }
 465
 466 /* Reads 1 videotext page buffer of the SAA5246A.
 467  *
 468  * req is used both as input and as output. It contains information which part
 469  * must be read. The videotext page is copied into req->buffer.
 470  *
 471  * Return value: 0 if successful
 472  */
 473 static inline int saa5246a_get_page(struct saa5246a_device *t,
 474         vtx_pagereq_t *req)
 475 {
 476         int start, end, size;
 477         char *buf;
 478         int err;
 479
 480         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
 481             req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
 482                 return -EINVAL;
 483
 484         buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
 485         if (!buf)
 486                 return -ENOMEM;
 487
 488         /* Read "normal" part of page */
 489         err = -EIO;
 490
 491         end = min(req->end, VTX_PAGESIZE - 1);
 492         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 493                         req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
 494                         ROW(req->start), COLUMN(req->start), COMMAND_END))
 495                 goto out;
 496         if (i2c_getdata(t, end - req->start + 1, buf))
 497                 goto out;
 498         err = -EFAULT;
 499         if (copy_to_user(req->buffer, buf, end - req->start + 1))
 500                 goto out;
 501
 502         /* Always get the time from buffer 4, since this stupid SAA5246A only
 503          * updates the currently displayed buffer...
 504          */
 505         if (REQ_CONTAINS_TIME(req)) {
 506                 start = max(req->start, POS_TIME_START);
 507                 end   = min(req->end,   POS_TIME_END);
 508                 size = end - start + 1;
 509                 err = -EINVAL;
 510                 if (size < 0)
 511                         goto out;
 512                 err = -EIO;
 513                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 514                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 515                                 R9_CURSER_ROW_0, start, COMMAND_END))
 516                         goto out;
 517                 if (i2c_getdata(t, size, buf))
 518                         goto out;
 519                 err = -EFAULT;
 520                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 521                         goto out;
 522         }
 523         /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
 524         if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
 525                 start = max(req->start, POS_HEADER_START);
 526                 end   = min(req->end,   POS_HEADER_END);
 527                 size = end - start + 1;
 528                 err = -EINVAL;
 529                 if (size < 0)
 530                         goto out;
 531                 err = -EIO;
 532                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 533                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 534                                 R9_CURSER_ROW_0, start, COMMAND_END))
 535                         goto out;
 536                 if (i2c_getdata(t, end - start + 1, buf))
 537                         goto out;
 538                 err = -EFAULT;
 539                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 540                         goto out;
 541         }
 542         err = 0;
 543 out:
 544         kfree(buf);
 545         return err;
 546 }
 547
 548 /* Stops the acquisition circuit given in dau_no. The page buffer associated
 549  * with this acquisition circuit will no more be updated. The other daus are
 550  * not affected.
 551  *
 552  * Return value: 0 if successful
 553  */
 554 static inline int saa5246a_stop_dau(struct saa5246a_device *t,
 555     unsigned char dau_no)
 556 {
 557         if (dau_no >= NUM_DAUS)
 558                 return -EINVAL;
 559         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 560
 561                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 562                 dau_no << 4 |
 563                 R2_BANK_0 |
 564                 R2_HAMMING_CHECK_OFF,
 565
 566                 R3_PAGE_HUNDREDS_0 |
 567                 R3_HOLD_PAGE |
 568                 R3_PAGE_HUNDREDS_DO_NOT_CARE,
 569
 570                 COMMAND_END))
 571         {
 572                 return -EIO;
 573         }
 574         t->is_searching[dau_no] = FALSE;
 575         return 0;
 576 }
 577
 578 /*  Handles ioctls defined in videotext.h
 579  *
 580  *  Returns 0 if successful
 581  */
 582 static int do_saa5246a_ioctl(struct inode *inode, struct file *file,
 583                             unsigned int cmd, void *arg)
 584 {
 585         struct video_device *vd = video_devdata(file);
 586         struct saa5246a_device *t=vd->priv;
 587         switch(cmd)
 588         {
 589                 case VTXIOCGETINFO:
 590                 {
 591                         vtx_info_t *info = arg;
 592
 593                         info->version_major = MAJOR_VERSION;
 594                         info->version_minor = MINOR_VERSION;
 595                         info->numpages = NUM_DAUS;
 596                         return 0;
 597                 }
 598
 599                 case VTXIOCCLRPAGE:
 600                 {
 601                         vtx_pagereq_t *req = arg;
 602
 603                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 604                                 return -EINVAL;
 605                         memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0]));
 606                         return 0;
 607                 }
 608
 609                 case VTXIOCCLRFOUND:
 610                 {
 611                         vtx_pagereq_t *req = arg;
 612
 613                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 614                                 return -EINVAL;
 615                         return(saa5246a_clear_found_bit(t, req->pgbuf));
 616                 }
 617
 618                 case VTXIOCPAGEREQ:
 619                 {
 620                         vtx_pagereq_t *req = arg;
 621
 622                         return(saa5246a_request_page(t, req));
 623                 }
 624
 625                 case VTXIOCGETSTAT:
 626                 {
 627                         vtx_pagereq_t *req = arg;
 628                         vtx_pageinfo_t info;
 629                         int rval;
 630
 631                         if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
 632                                 return rval;
 633                         if(copy_to_user(req->buffer, &info,
 634                                 sizeof(vtx_pageinfo_t)))
 635                                 return -EFAULT;
 636                         return 0;
 637                 }
 638
 639                 case VTXIOCGETPAGE:
 640                 {
 641                         vtx_pagereq_t *req = arg;
 642
 643                         return(saa5246a_get_page(t, req));
 644                 }
 645
 646                 case VTXIOCSTOPDAU:
 647                 {
 648                         vtx_pagereq_t *req = arg;
 649
 650                         return(saa5246a_stop_dau(t, req->pgbuf));
 651                 }
 652
 653                 case VTXIOCPUTPAGE:
 654                 case VTXIOCSETDISP:
 655                 case VTXIOCPUTSTAT:
 656                         return 0;
 657
 658                 case VTXIOCCLRCACHE:
 659                 {
 660                         return 0;
 661                 }
 662
 663                 case VTXIOCSETVIRT:
 664                 {
 665                         /* I do not know what "virtual mode" means */
 666                         return 0;
 667                 }
 668         }
 669         return -EINVAL;
 670 }
 671
 672 /*
 673  * Translates old vtx IOCTLs to new ones
 674  *
 675  * This keeps new kernel versions compatible with old userspace programs.
 676  */
 677 static inline unsigned int vtx_fix_command(unsigned int cmd)
 678 {
 679         switch (cmd) {
 680         case VTXIOCGETINFO_OLD:
 681                 cmd = VTXIOCGETINFO;
 682                 break;
 683         case VTXIOCCLRPAGE_OLD:
 684                 cmd = VTXIOCCLRPAGE;
 685                 break;
 686         case VTXIOCCLRFOUND_OLD:
 687                 cmd = VTXIOCCLRFOUND;
 688                 break;
 689         case VTXIOCPAGEREQ_OLD:
 690                 cmd = VTXIOCPAGEREQ;
 691                 break;
 692         case VTXIOCGETSTAT_OLD:
 693                 cmd = VTXIOCGETSTAT;
 694                 break;
 695         case VTXIOCGETPAGE_OLD:
 696                 cmd = VTXIOCGETPAGE;
 697                 break;
 698         case VTXIOCSTOPDAU_OLD:
 699                 cmd = VTXIOCSTOPDAU;
 700                 break;
 701         case VTXIOCPUTPAGE_OLD:
 702                 cmd = VTXIOCPUTPAGE;
 703                 break;
 704         case VTXIOCSETDISP_OLD:
 705                 cmd = VTXIOCSETDISP;
 706                 break;
 707         case VTXIOCPUTSTAT_OLD:
 708                 cmd = VTXIOCPUTSTAT;
 709                 break;
 710         case VTXIOCCLRCACHE_OLD:
 711                 cmd = VTXIOCCLRCACHE;
 712                 break;
 713         case VTXIOCSETVIRT_OLD:
 714                 cmd = VTXIOCSETVIRT;
 715                 break;
 716         }
 717         return cmd;
 718 }
 719
 720 /*
 721  *      Handle the locking
 722  */
 723 static int saa5246a_ioctl(struct inode *inode, struct file *file,
 724                          unsigned int cmd, unsigned long arg)
 725 {
 726         struct video_device *vd = video_devdata(file);
 727         struct saa5246a_device *t = vd->priv;
 728         int err;
 729
 730         cmd = vtx_fix_command(cmd);
 731         down(&t->lock);
 732         err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
 733         up(&t->lock);
 734         return err;
 735 }
 736
 737 static int saa5246a_open(struct inode *inode, struct file *file)
 738 {
 739         struct video_device *vd = video_devdata(file);
 740         struct saa5246a_device *t = vd->priv;
 741         int err;
 742
 743         err = video_exclusive_open(inode,file);
 744         if (err < 0)
 745                 return err;
 746
 747         if (t->client==NULL) {
 748                 err = -ENODEV;
 749                 goto fail;
 750         }
 751
 752         if (i2c_senddata(t, SAA5246A_REGISTER_R0,
 753
 754                 R0_SELECT_R11 |
 755                 R0_PLL_TIME_CONSTANT_LONG |
 756                 R0_ENABLE_nODD_EVEN_OUTPUT |
 757                 R0_ENABLE_HDR_POLL |
 758                 R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
 759                 R0_NO_FREE_RUN_PLL |
 760                 R0_NO_AUTOMATIC_FASTEXT_PROMPT,
 761
 762                 R1_NON_INTERLACED_312_312_LINES |
 763                 R1_DEW |
 764                 R1_EXTENDED_PACKET_DISABLE |
 765                 R1_DAUS_ALL_ON |
 766                 R1_8_BITS_NO_PARITY |
 767                 R1_VCS_TO_SCS,
 768
 769                 COMMAND_END) ||
 770                 i2c_senddata(t, SAA5246A_REGISTER_R4,
 771
 772                 /* We do not care much for the TV display but nevertheless we
 773                  * need the currently displayed page later because only on that
 774                  * page the time is updated. */
 775                 R4_DISPLAY_PAGE_4,
 776
 777                 COMMAND_END))
 778         {
 779                 err = -EIO;
 780                 goto fail;
 781         }
 782
 783         return 0;
 784
 785 fail:
 786         video_exclusive_release(inode,file);
 787         return err;
 788 }
 789
 790 static int saa5246a_release(struct inode *inode, struct file *file)
 791 {
 792         struct video_device *vd = video_devdata(file);
 793         struct saa5246a_device *t = vd->priv;
 794
 795         /* Stop all acquisition circuits. */
 796         i2c_senddata(t, SAA5246A_REGISTER_R1,
 797
 798                 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
 799                 R1_DEW |
 800                 R1_EXTENDED_PACKET_DISABLE |
 801                 R1_DAUS_ALL_OFF |
 802                 R1_8_BITS_NO_PARITY |
 803                 R1_VCS_TO_SCS,
 804
 805                 COMMAND_END);
 806         video_exclusive_release(inode,file);
 807         return 0;
 808 }
 809
 810 static int __init init_saa_5246a (void)
 811 {
 812         printk(KERN_INFO
 813                 "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
 814                 MAJOR_VERSION, MINOR_VERSION);
 815         return i2c_add_driver(&i2c_driver_videotext);
 816 }
 817
 818 static void __exit cleanup_saa_5246a (void)
 819 {
 820         i2c_del_driver(&i2c_driver_videotext);
 821 }
 822
 823 module_init(init_saa_5246a);
 824 module_exit(cleanup_saa_5246a);
 825
 826 static struct file_operations saa_fops = {
 827         .owner   = THIS_MODULE,
 828         .open    = saa5246a_open,
 829         .release = saa5246a_release,
 830         .ioctl   = saa5246a_ioctl,
 831         .llseek  = no_llseek,
 832 };
 833
 834 static struct video_device saa_template =
 835 {
 836         .owner    = THIS_MODULE,
 837         .name     = IF_NAME,
 838         .type     = VID_TYPE_TELETEXT,
 839         .hardware = VID_HARDWARE_SAA5249,
 840         .fops     = &saa_fops,
 841         .release  = video_device_release,
 842         .minor    = -1,
 843 };