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/smp_lock.h>
  48 #include <linux/videodev.h>
  49 #include <media/v4l2-common.h>
  50 #include <media/v4l2-ioctl.h>
  51 #include <linux/mutex.h>
  52
  53 #include "saa5246a.h"
  54
  55 MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
  56 MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver");
  57 MODULE_LICENSE("GPL");
  58
  59 struct saa5246a_device
  60 {
  61         u8     pgbuf[NUM_DAUS][VTX_VIRTUALSIZE];
  62         int    is_searching[NUM_DAUS];
  63         struct i2c_client *client;
  64         unsigned long in_use;
  65         struct mutex lock;
  66 };
  67
  68 static struct video_device saa_template;        /* Declared near bottom */
  69
  70 /* Addresses to scan */
  71 static unsigned short normal_i2c[]       = { I2C_ADDRESS, I2C_CLIENT_END };
  72
  73 I2C_CLIENT_INSMOD;
  74
  75 static struct i2c_client client_template;
  76
  77 static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind)
  78 {
  79         int pgbuf;
  80         int err;
  81         struct i2c_client *client;
  82         struct video_device *vd;
  83         struct saa5246a_device *t;
  84
  85         printk(KERN_INFO "saa5246a: teletext chip found.\n");
  86         client=kmalloc(sizeof(*client), GFP_KERNEL);
  87         if(client==NULL)
  88                 return -ENOMEM;
  89         client_template.adapter = adap;
  90         client_template.addr = addr;
  91         memcpy(client, &client_template, sizeof(*client));
  92         t = kzalloc(sizeof(*t), GFP_KERNEL);
  93         if(t==NULL)
  94         {
  95                 kfree(client);
  96                 return -ENOMEM;
  97         }
  98         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
  99         mutex_init(&t->lock);
 100
 101         /*
 102          *      Now create a video4linux device
 103          */
 104
 105         vd = video_device_alloc();
 106         if(vd==NULL)
 107         {
 108                 kfree(t);
 109                 kfree(client);
 110                 return -ENOMEM;
 111         }
 112         i2c_set_clientdata(client, vd);
 113         memcpy(vd, &saa_template, sizeof(*vd));
 114
 115         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 116         {
 117                 memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
 118                 t->is_searching[pgbuf] = false;
 119         }
 120         video_set_drvdata(vd, t);
 121
 122
 123         /*
 124          *      Register it
 125          */
 126
 127         if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
 128         {
 129                 kfree(t);
 130                 kfree(client);
 131                 video_device_release(vd);
 132                 return err;
 133         }
 134         t->client = client;
 135         i2c_attach_client(client);
 136         return 0;
 137 }
 138
 139 /*
 140  *      We do most of the hard work when we become a device on the i2c.
 141  */
 142 static int saa5246a_probe(struct i2c_adapter *adap)
 143 {
 144         if (adap->class & I2C_CLASS_TV_ANALOG)
 145                 return i2c_probe(adap, &addr_data, saa5246a_attach);
 146         return 0;
 147 }
 148
 149 static int saa5246a_detach(struct i2c_client *client)
 150 {
 151         struct video_device *vd = i2c_get_clientdata(client);
 152         i2c_detach_client(client);
 153         video_unregister_device(vd);
 154         kfree(video_get_drvdata(vd));
 155         kfree(client);
 156         return 0;
 157 }
 158
 159 /*
 160  *      I2C interfaces
 161  */
 162
 163 static struct i2c_driver i2c_driver_videotext =
 164 {
 165         .driver = {
 166                 .name   = IF_NAME,              /* name */
 167         },
 168         .id             = I2C_DRIVERID_SAA5249, /* in i2c.h */
 169         .attach_adapter = saa5246a_probe,
 170         .detach_client  = saa5246a_detach,
 171 };
 172
 173 static struct i2c_client client_template = {
 174         .driver         = &i2c_driver_videotext,
 175         .name           = "(unset)",
 176 };
 177
 178 static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
 179 {
 180         char buf[64];
 181
 182         buf[0] = reg;
 183         memcpy(buf+1, data, count);
 184
 185         if(i2c_master_send(t->client, buf, count+1)==count+1)
 186                 return 0;
 187         return -1;
 188 }
 189
 190 static int i2c_senddata(struct saa5246a_device *t, ...)
 191 {
 192         unsigned char buf[64];
 193         int v;
 194         int ct = 0;
 195         va_list argp;
 196         va_start(argp, t);
 197
 198         while ((v = va_arg(argp, int)) != -1)
 199                 buf[ct++] = v;
 200
 201         va_end(argp);
 202         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 203 }
 204
 205 /* Get count number of bytes from I²C-device at address adr, store them in buf.
 206  * Start & stop handshaking is done by this routine, ack will be sent after the
 207  * last byte to inhibit further sending of data. If uaccess is 'true', data is
 208  * written to user-space with put_user. Returns -1 if I²C-device didn't send
 209  * acknowledge, 0 otherwise
 210  */
 211 static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
 212 {
 213         if(i2c_master_recv(t->client, buf, count)!=count)
 214                 return -1;
 215         return 0;
 216 }
 217
 218 /* When a page is found then the not FOUND bit in one of the status registers
 219  * of the SAA5264A chip is cleared. Unfortunately this bit is not set
 220  * automatically when a new page is requested. Instead this function must be
 221  * called after a page has been requested.
 222  *
 223  * Return value: 0 if successful
 224  */
 225 static int saa5246a_clear_found_bit(struct saa5246a_device *t,
 226         unsigned char dau_no)
 227 {
 228         unsigned char row_25_column_8;
 229
 230         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 231
 232                 dau_no |
 233                 R8_DO_NOT_CLEAR_MEMORY,
 234
 235                 R9_CURSER_ROW_25,
 236
 237                 R10_CURSER_COLUMN_8,
 238
 239                 COMMAND_END) ||
 240                 i2c_getdata(t, 1, &row_25_column_8))
 241         {
 242                 return -EIO;
 243         }
 244         row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
 245         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 246
 247                 dau_no |
 248                 R8_DO_NOT_CLEAR_MEMORY,
 249
 250                 R9_CURSER_ROW_25,
 251
 252                 R10_CURSER_COLUMN_8,
 253
 254                 row_25_column_8,
 255
 256                 COMMAND_END))
 257         {
 258                 return -EIO;
 259         }
 260
 261         return 0;
 262 }
 263
 264 /* Requests one videotext page as described in req. The fields of req are
 265  * checked and an error is returned if something is invalid.
 266  *
 267  * Return value: 0 if successful
 268  */
 269 static int saa5246a_request_page(struct saa5246a_device *t,
 270     vtx_pagereq_t *req)
 271 {
 272         if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
 273                 return -EINVAL;
 274         if (req->pagemask & PGMASK_PAGE)
 275                 if (req->page < 0 || req->page > PAGE_MAX)
 276                         return -EINVAL;
 277         if (req->pagemask & PGMASK_HOUR)
 278                 if (req->hour < 0 || req->hour > HOUR_MAX)
 279                         return -EINVAL;
 280         if (req->pagemask & PGMASK_MINUTE)
 281                 if (req->minute < 0 || req->minute > MINUTE_MAX)
 282                         return -EINVAL;
 283         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 284                 return -EINVAL;
 285
 286         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 287
 288                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 289                 req->pgbuf << 4 |
 290                 R2_BANK_0 |
 291                 R2_HAMMING_CHECK_OFF,
 292
 293                 HUNDREDS_OF_PAGE(req->page) |
 294                 R3_HOLD_PAGE |
 295                 (req->pagemask & PG_HUND ?
 296                         R3_PAGE_HUNDREDS_DO_CARE :
 297                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 298
 299                 TENS_OF_PAGE(req->page) |
 300                 (req->pagemask & PG_TEN ?
 301                         R3_PAGE_TENS_DO_CARE :
 302                         R3_PAGE_TENS_DO_NOT_CARE),
 303
 304                 UNITS_OF_PAGE(req->page) |
 305                 (req->pagemask & PG_UNIT ?
 306                         R3_PAGE_UNITS_DO_CARE :
 307                         R3_PAGE_UNITS_DO_NOT_CARE),
 308
 309                 TENS_OF_HOUR(req->hour) |
 310                 (req->pagemask & HR_TEN ?
 311                         R3_HOURS_TENS_DO_CARE :
 312                         R3_HOURS_TENS_DO_NOT_CARE),
 313
 314                 UNITS_OF_HOUR(req->hour) |
 315                 (req->pagemask & HR_UNIT ?
 316                         R3_HOURS_UNITS_DO_CARE :
 317                         R3_HOURS_UNITS_DO_NOT_CARE),
 318
 319                 TENS_OF_MINUTE(req->minute) |
 320                 (req->pagemask & MIN_TEN ?
 321                         R3_MINUTES_TENS_DO_CARE :
 322                         R3_MINUTES_TENS_DO_NOT_CARE),
 323
 324                 UNITS_OF_MINUTE(req->minute) |
 325                 (req->pagemask & MIN_UNIT ?
 326                         R3_MINUTES_UNITS_DO_CARE :
 327                         R3_MINUTES_UNITS_DO_NOT_CARE),
 328
 329                 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
 330
 331                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 332                 req->pgbuf << 4 |
 333                 R2_BANK_0 |
 334                 R2_HAMMING_CHECK_OFF,
 335
 336                 HUNDREDS_OF_PAGE(req->page) |
 337                 R3_UPDATE_PAGE |
 338                 (req->pagemask & PG_HUND ?
 339                         R3_PAGE_HUNDREDS_DO_CARE :
 340                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 341
 342                 COMMAND_END))
 343         {
 344                 return -EIO;
 345         }
 346
 347         t->is_searching[req->pgbuf] = true;
 348         return 0;
 349 }
 350
 351 /* This routine decodes the page number from the infobits contained in line 25.
 352  *
 353  * Parameters:
 354  * infobits: must be bits 0 to 9 of column 25
 355  *
 356  * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
 357  */
 358 static inline int saa5246a_extract_pagenum_from_infobits(
 359     unsigned char infobits[10])
 360 {
 361         int page_hundreds, page_tens, page_units;
 362
 363         page_units    = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
 364         page_tens     = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
 365         page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
 366
 367         /* page 0x.. means page 8.. */
 368         if (page_hundreds == 0)
 369                 page_hundreds = 8;
 370
 371         return((page_hundreds << 8) | (page_tens << 4) | page_units);
 372 }
 373
 374 /* Decodes the hour from the infobits contained in line 25.
 375  *
 376  * Parameters:
 377  * infobits: must be bits 0 to 9 of column 25
 378  *
 379  * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
 380  */
 381 static inline int saa5246a_extract_hour_from_infobits(
 382     unsigned char infobits[10])
 383 {
 384         int hour_tens, hour_units;
 385
 386         hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
 387         hour_tens  = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
 388
 389         return((hour_tens << 4) | hour_units);
 390 }
 391
 392 /* Decodes the minutes from the infobits contained in line 25.
 393  *
 394  * Parameters:
 395  * infobits: must be bits 0 to 9 of column 25
 396  *
 397  * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
 398  */
 399 static inline int saa5246a_extract_minutes_from_infobits(
 400     unsigned char infobits[10])
 401 {
 402         int minutes_tens, minutes_units;
 403
 404         minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
 405         minutes_tens  = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
 406
 407         return((minutes_tens << 4) | minutes_units);
 408 }
 409
 410 /* Reads the status bits contained in the first 10 columns of the first line
 411  * and extracts the information into info.
 412  *
 413  * Return value: 0 if successful
 414  */
 415 static inline int saa5246a_get_status(struct saa5246a_device *t,
 416     vtx_pageinfo_t *info, unsigned char dau_no)
 417 {
 418         unsigned char infobits[10];
 419         int column;
 420
 421         if (dau_no >= NUM_DAUS)
 422                 return -EINVAL;
 423
 424         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 425
 426                 dau_no |
 427                 R8_DO_NOT_CLEAR_MEMORY,
 428
 429                 R9_CURSER_ROW_25,
 430
 431                 R10_CURSER_COLUMN_0,
 432
 433                 COMMAND_END) ||
 434                 i2c_getdata(t, 10, infobits))
 435         {
 436                 return -EIO;
 437         }
 438
 439         info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
 440         info->hour    = saa5246a_extract_hour_from_infobits(infobits);
 441         info->minute  = saa5246a_extract_minutes_from_infobits(infobits);
 442         info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
 443         info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
 444         info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
 445         info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
 446         info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
 447         info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
 448         info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
 449         info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
 450         info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
 451         info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
 452         info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
 453         info->hamming = 0;
 454         for (column = 0; column <= 7; column++) {
 455                 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
 456                         info->hamming = 1;
 457                         break;
 458                 }
 459         }
 460         if (!info->hamming && !info->notfound)
 461                 t->is_searching[dau_no] = false;
 462         return 0;
 463 }
 464
 465 /* Reads 1 videotext page buffer of the SAA5246A.
 466  *
 467  * req is used both as input and as output. It contains information which part
 468  * must be read. The videotext page is copied into req->buffer.
 469  *
 470  * Return value: 0 if successful
 471  */
 472 static inline int saa5246a_get_page(struct saa5246a_device *t,
 473         vtx_pagereq_t *req)
 474 {
 475         int start, end, size;
 476         char *buf;
 477         int err;
 478
 479         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
 480             req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
 481                 return -EINVAL;
 482
 483         buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
 484         if (!buf)
 485                 return -ENOMEM;
 486
 487         /* Read "normal" part of page */
 488         err = -EIO;
 489
 490         end = min(req->end, VTX_PAGESIZE - 1);
 491         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 492                         req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
 493                         ROW(req->start), COLUMN(req->start), COMMAND_END))
 494                 goto out;
 495         if (i2c_getdata(t, end - req->start + 1, buf))
 496                 goto out;
 497         err = -EFAULT;
 498         if (copy_to_user(req->buffer, buf, end - req->start + 1))
 499                 goto out;
 500
 501         /* Always get the time from buffer 4, since this stupid SAA5246A only
 502          * updates the currently displayed buffer...
 503          */
 504         if (REQ_CONTAINS_TIME(req)) {
 505                 start = max(req->start, POS_TIME_START);
 506                 end   = min(req->end,   POS_TIME_END);
 507                 size = end - start + 1;
 508                 err = -EINVAL;
 509                 if (size < 0)
 510                         goto out;
 511                 err = -EIO;
 512                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 513                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 514                                 R9_CURSER_ROW_0, start, COMMAND_END))
 515                         goto out;
 516                 if (i2c_getdata(t, size, buf))
 517                         goto out;
 518                 err = -EFAULT;
 519                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 520                         goto out;
 521         }
 522         /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
 523         if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
 524                 start = max(req->start, POS_HEADER_START);
 525                 end   = min(req->end,   POS_HEADER_END);
 526                 size = end - start + 1;
 527                 err = -EINVAL;
 528                 if (size < 0)
 529                         goto out;
 530                 err = -EIO;
 531                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 532                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 533                                 R9_CURSER_ROW_0, start, COMMAND_END))
 534                         goto out;
 535                 if (i2c_getdata(t, end - start + 1, buf))
 536                         goto out;
 537                 err = -EFAULT;
 538                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 539                         goto out;
 540         }
 541         err = 0;
 542 out:
 543         kfree(buf);
 544         return err;
 545 }
 546
 547 /* Stops the acquisition circuit given in dau_no. The page buffer associated
 548  * with this acquisition circuit will no more be updated. The other daus are
 549  * not affected.
 550  *
 551  * Return value: 0 if successful
 552  */
 553 static inline int saa5246a_stop_dau(struct saa5246a_device *t,
 554     unsigned char dau_no)
 555 {
 556         if (dau_no >= NUM_DAUS)
 557                 return -EINVAL;
 558         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 559
 560                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 561                 dau_no << 4 |
 562                 R2_BANK_0 |
 563                 R2_HAMMING_CHECK_OFF,
 564
 565                 R3_PAGE_HUNDREDS_0 |
 566                 R3_HOLD_PAGE |
 567                 R3_PAGE_HUNDREDS_DO_NOT_CARE,
 568
 569                 COMMAND_END))
 570         {
 571                 return -EIO;
 572         }
 573         t->is_searching[dau_no] = false;
 574         return 0;
 575 }
 576
 577 /*  Handles ioctls defined in videotext.h
 578  *
 579  *  Returns 0 if successful
 580  */
 581 static int do_saa5246a_ioctl(struct inode *inode, struct file *file,
 582                             unsigned int cmd, void *arg)
 583 {
 584         struct video_device *vd = video_devdata(file);
 585         struct saa5246a_device *t = video_get_drvdata(vd);
 586
 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 = video_get_drvdata(vd);
 728         int err;
 729
 730         cmd = vtx_fix_command(cmd);
 731         mutex_lock(&t->lock);
 732         err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
 733         mutex_unlock(&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 = video_get_drvdata(vd);
 741
 742         if (t->client == NULL)
 743                 return -ENODEV;
 744
 745         if (test_and_set_bit(0, &t->in_use))
 746                 return -EBUSY;
 747
 748         if (i2c_senddata(t, SAA5246A_REGISTER_R0,
 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                 clear_bit(0, &t->in_use);
 775                 return -EIO;
 776         }
 777         return 0;
 778 }
 779
 780 static int saa5246a_release(struct inode *inode, struct file *file)
 781 {
 782         struct video_device *vd = video_devdata(file);
 783         struct saa5246a_device *t = video_get_drvdata(vd);
 784
 785         /* Stop all acquisition circuits. */
 786         i2c_senddata(t, SAA5246A_REGISTER_R1,
 787
 788                 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
 789                 R1_DEW |
 790                 R1_EXTENDED_PACKET_DISABLE |
 791                 R1_DAUS_ALL_OFF |
 792                 R1_8_BITS_NO_PARITY |
 793                 R1_VCS_TO_SCS,
 794
 795                 COMMAND_END);
 796         clear_bit(0, &t->in_use);
 797         return 0;
 798 }
 799
 800 static int __init init_saa_5246a (void)
 801 {
 802         printk(KERN_INFO
 803                 "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
 804                 MAJOR_VERSION, MINOR_VERSION);
 805         return i2c_add_driver(&i2c_driver_videotext);
 806 }
 807
 808 static void __exit cleanup_saa_5246a (void)
 809 {
 810         i2c_del_driver(&i2c_driver_videotext);
 811 }
 812
 813 module_init(init_saa_5246a);
 814 module_exit(cleanup_saa_5246a);
 815
 816 static const struct file_operations saa_fops = {
 817         .owner   = THIS_MODULE,
 818         .open    = saa5246a_open,
 819         .release = saa5246a_release,
 820         .ioctl   = saa5246a_ioctl,
 821         .llseek  = no_llseek,
 822 };
 823
 824 static struct video_device saa_template =
 825 {
 826         .name     = IF_NAME,
 827         .fops     = &saa_fops,
 828         .release  = video_device_release,
 829         .minor    = -1,
 830 };