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