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