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