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 <media/v4l2-ioctl.h>
  50 #include <linux/mutex.h>
  51
  52 #include "saa5246a.h"
  53
  54 MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
  55 MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver");
  56 MODULE_LICENSE("GPL");
  57
  58 struct saa5246a_device
  59 {
  60         u8     pgbuf[NUM_DAUS][VTX_VIRTUALSIZE];
  61         int    is_searching[NUM_DAUS];
  62         struct i2c_client *client;
  63         struct mutex lock;
  64 };
  65
  66 static struct video_device saa_template;        /* Declared near bottom */
  67
  68 /* Addresses to scan */
  69 static unsigned short normal_i2c[]       = { I2C_ADDRESS, I2C_CLIENT_END };
  70
  71 I2C_CLIENT_INSMOD;
  72
  73 static struct i2c_client client_template;
  74
  75 static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind)
  76 {
  77         int pgbuf;
  78         int err;
  79         struct i2c_client *client;
  80         struct video_device *vd;
  81         struct saa5246a_device *t;
  82
  83         printk(KERN_INFO "saa5246a: teletext chip found.\n");
  84         client=kmalloc(sizeof(*client), GFP_KERNEL);
  85         if(client==NULL)
  86                 return -ENOMEM;
  87         client_template.adapter = adap;
  88         client_template.addr = addr;
  89         memcpy(client, &client_template, sizeof(*client));
  90         t = kzalloc(sizeof(*t), GFP_KERNEL);
  91         if(t==NULL)
  92         {
  93                 kfree(client);
  94                 return -ENOMEM;
  95         }
  96         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
  97         mutex_init(&t->lock);
  98
  99         /*
 100          *      Now create a video4linux device
 101          */
 102
 103         vd = video_device_alloc();
 104         if(vd==NULL)
 105         {
 106                 kfree(t);
 107                 kfree(client);
 108                 return -ENOMEM;
 109         }
 110         i2c_set_clientdata(client, vd);
 111         memcpy(vd, &saa_template, sizeof(*vd));
 112
 113         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 114         {
 115                 memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
 116                 t->is_searching[pgbuf] = false;
 117         }
 118         vd->priv=t;
 119
 120
 121         /*
 122          *      Register it
 123          */
 124
 125         if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
 126         {
 127                 kfree(t);
 128                 kfree(client);
 129                 video_device_release(vd);
 130                 return err;
 131         }
 132         t->client = client;
 133         i2c_attach_client(client);
 134         return 0;
 135 }
 136
 137 /*
 138  *      We do most of the hard work when we become a device on the i2c.
 139  */
 140 static int saa5246a_probe(struct i2c_adapter *adap)
 141 {
 142         if (adap->class & I2C_CLASS_TV_ANALOG)
 143                 return i2c_probe(adap, &addr_data, saa5246a_attach);
 144         return 0;
 145 }
 146
 147 static int saa5246a_detach(struct i2c_client *client)
 148 {
 149         struct video_device *vd = i2c_get_clientdata(client);
 150         i2c_detach_client(client);
 151         video_unregister_device(vd);
 152         kfree(vd->priv);
 153         kfree(client);
 154         return 0;
 155 }
 156
 157 /*
 158  *      I2C interfaces
 159  */
 160
 161 static struct i2c_driver i2c_driver_videotext =
 162 {
 163         .driver = {
 164                 .name   = IF_NAME,              /* name */
 165         },
 166         .id             = I2C_DRIVERID_SAA5249, /* in i2c.h */
 167         .attach_adapter = saa5246a_probe,
 168         .detach_client  = saa5246a_detach,
 169 };
 170
 171 static struct i2c_client client_template = {
 172         .driver         = &i2c_driver_videotext,
 173         .name           = "(unset)",
 174 };
 175
 176 static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
 177 {
 178         char buf[64];
 179
 180         buf[0] = reg;
 181         memcpy(buf+1, data, count);
 182
 183         if(i2c_master_send(t->client, buf, count+1)==count+1)
 184                 return 0;
 185         return -1;
 186 }
 187
 188 static int i2c_senddata(struct saa5246a_device *t, ...)
 189 {
 190         unsigned char buf[64];
 191         int v;
 192         int ct = 0;
 193         va_list argp;
 194         va_start(argp, t);
 195
 196         while ((v = va_arg(argp, int)) != -1)
 197                 buf[ct++] = v;
 198
 199         va_end(argp);
 200         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 201 }
 202
 203 /* Get count number of bytes from I²C-device at address adr, store them in buf.
 204  * Start & stop handshaking is done by this routine, ack will be sent after the
 205  * last byte to inhibit further sending of data. If uaccess is 'true', data is
 206  * written to user-space with put_user. Returns -1 if I²C-device didn't send
 207  * acknowledge, 0 otherwise
 208  */
 209 static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
 210 {
 211         if(i2c_master_recv(t->client, buf, count)!=count)
 212                 return -1;
 213         return 0;
 214 }
 215
 216 /* When a page is found then the not FOUND bit in one of the status registers
 217  * of the SAA5264A chip is cleared. Unfortunately this bit is not set
 218  * automatically when a new page is requested. Instead this function must be
 219  * called after a page has been requested.
 220  *
 221  * Return value: 0 if successful
 222  */
 223 static int saa5246a_clear_found_bit(struct saa5246a_device *t,
 224         unsigned char dau_no)
 225 {
 226         unsigned char row_25_column_8;
 227
 228         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 229
 230                 dau_no |
 231                 R8_DO_NOT_CLEAR_MEMORY,
 232
 233                 R9_CURSER_ROW_25,
 234
 235                 R10_CURSER_COLUMN_8,
 236
 237                 COMMAND_END) ||
 238                 i2c_getdata(t, 1, &row_25_column_8))
 239         {
 240                 return -EIO;
 241         }
 242         row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
 243         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 244
 245                 dau_no |
 246                 R8_DO_NOT_CLEAR_MEMORY,
 247
 248                 R9_CURSER_ROW_25,
 249
 250                 R10_CURSER_COLUMN_8,
 251
 252                 row_25_column_8,
 253
 254                 COMMAND_END))
 255         {
 256                 return -EIO;
 257         }
 258
 259         return 0;
 260 }
 261
 262 /* Requests one videotext page as described in req. The fields of req are
 263  * checked and an error is returned if something is invalid.
 264  *
 265  * Return value: 0 if successful
 266  */
 267 static int saa5246a_request_page(struct saa5246a_device *t,
 268     vtx_pagereq_t *req)
 269 {
 270         if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
 271                 return -EINVAL;
 272         if (req->pagemask & PGMASK_PAGE)
 273                 if (req->page < 0 || req->page > PAGE_MAX)
 274                         return -EINVAL;
 275         if (req->pagemask & PGMASK_HOUR)
 276                 if (req->hour < 0 || req->hour > HOUR_MAX)
 277                         return -EINVAL;
 278         if (req->pagemask & PGMASK_MINUTE)
 279                 if (req->minute < 0 || req->minute > MINUTE_MAX)
 280                         return -EINVAL;
 281         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 282                 return -EINVAL;
 283
 284         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 285
 286                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 287                 req->pgbuf << 4 |
 288                 R2_BANK_0 |
 289                 R2_HAMMING_CHECK_OFF,
 290
 291                 HUNDREDS_OF_PAGE(req->page) |
 292                 R3_HOLD_PAGE |
 293                 (req->pagemask & PG_HUND ?
 294                         R3_PAGE_HUNDREDS_DO_CARE :
 295                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 296
 297                 TENS_OF_PAGE(req->page) |
 298                 (req->pagemask & PG_TEN ?
 299                         R3_PAGE_TENS_DO_CARE :
 300                         R3_PAGE_TENS_DO_NOT_CARE),
 301
 302                 UNITS_OF_PAGE(req->page) |
 303                 (req->pagemask & PG_UNIT ?
 304                         R3_PAGE_UNITS_DO_CARE :
 305                         R3_PAGE_UNITS_DO_NOT_CARE),
 306
 307                 TENS_OF_HOUR(req->hour) |
 308                 (req->pagemask & HR_TEN ?
 309                         R3_HOURS_TENS_DO_CARE :
 310                         R3_HOURS_TENS_DO_NOT_CARE),
 311
 312                 UNITS_OF_HOUR(req->hour) |
 313                 (req->pagemask & HR_UNIT ?
 314                         R3_HOURS_UNITS_DO_CARE :
 315                         R3_HOURS_UNITS_DO_NOT_CARE),
 316
 317                 TENS_OF_MINUTE(req->minute) |
 318                 (req->pagemask & MIN_TEN ?
 319                         R3_MINUTES_TENS_DO_CARE :
 320                         R3_MINUTES_TENS_DO_NOT_CARE),
 321
 322                 UNITS_OF_MINUTE(req->minute) |
 323                 (req->pagemask & MIN_UNIT ?
 324                         R3_MINUTES_UNITS_DO_CARE :
 325                         R3_MINUTES_UNITS_DO_NOT_CARE),
 326
 327                 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
 328
 329                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 330                 req->pgbuf << 4 |
 331                 R2_BANK_0 |
 332                 R2_HAMMING_CHECK_OFF,
 333
 334                 HUNDREDS_OF_PAGE(req->page) |
 335                 R3_UPDATE_PAGE |
 336                 (req->pagemask & PG_HUND ?
 337                         R3_PAGE_HUNDREDS_DO_CARE :
 338                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 339
 340                 COMMAND_END))
 341         {
 342                 return -EIO;
 343         }
 344
 345         t->is_searching[req->pgbuf] = true;
 346         return 0;
 347 }
 348
 349 /* This routine decodes the page number from the infobits contained in line 25.
 350  *
 351  * Parameters:
 352  * infobits: must be bits 0 to 9 of column 25
 353  *
 354  * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
 355  */
 356 static inline int saa5246a_extract_pagenum_from_infobits(
 357     unsigned char infobits[10])
 358 {
 359         int page_hundreds, page_tens, page_units;
 360
 361         page_units    = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
 362         page_tens     = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
 363         page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
 364
 365         /* page 0x.. means page 8.. */
 366         if (page_hundreds == 0)
 367                 page_hundreds = 8;
 368
 369         return((page_hundreds << 8) | (page_tens << 4) | page_units);
 370 }
 371
 372 /* Decodes the hour from the infobits contained in line 25.
 373  *
 374  * Parameters:
 375  * infobits: must be bits 0 to 9 of column 25
 376  *
 377  * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
 378  */
 379 static inline int saa5246a_extract_hour_from_infobits(
 380     unsigned char infobits[10])
 381 {
 382         int hour_tens, hour_units;
 383
 384         hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
 385         hour_tens  = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
 386
 387         return((hour_tens << 4) | hour_units);
 388 }
 389
 390 /* Decodes the minutes from the infobits contained in line 25.
 391  *
 392  * Parameters:
 393  * infobits: must be bits 0 to 9 of column 25
 394  *
 395  * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
 396  */
 397 static inline int saa5246a_extract_minutes_from_infobits(
 398     unsigned char infobits[10])
 399 {
 400         int minutes_tens, minutes_units;
 401
 402         minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
 403         minutes_tens  = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
 404
 405         return((minutes_tens << 4) | minutes_units);
 406 }
 407
 408 /* Reads the status bits contained in the first 10 columns of the first line
 409  * and extracts the information into info.
 410  *
 411  * Return value: 0 if successful
 412  */
 413 static inline int saa5246a_get_status(struct saa5246a_device *t,
 414     vtx_pageinfo_t *info, unsigned char dau_no)
 415 {
 416         unsigned char infobits[10];
 417         int column;
 418
 419         if (dau_no >= NUM_DAUS)
 420                 return -EINVAL;
 421
 422         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 423
 424                 dau_no |
 425                 R8_DO_NOT_CLEAR_MEMORY,
 426
 427                 R9_CURSER_ROW_25,
 428
 429                 R10_CURSER_COLUMN_0,
 430
 431                 COMMAND_END) ||
 432                 i2c_getdata(t, 10, infobits))
 433         {
 434                 return -EIO;
 435         }
 436
 437         info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
 438         info->hour    = saa5246a_extract_hour_from_infobits(infobits);
 439         info->minute  = saa5246a_extract_minutes_from_infobits(infobits);
 440         info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
 441         info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
 442         info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
 443         info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
 444         info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
 445         info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
 446         info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
 447         info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
 448         info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
 449         info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
 450         info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
 451         info->hamming = 0;
 452         for (column = 0; column <= 7; column++) {
 453                 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
 454                         info->hamming = 1;
 455                         break;
 456                 }
 457         }
 458         if (!info->hamming && !info->notfound)
 459                 t->is_searching[dau_no] = false;
 460         return 0;
 461 }
 462
 463 /* Reads 1 videotext page buffer of the SAA5246A.
 464  *
 465  * req is used both as input and as output. It contains information which part
 466  * must be read. The videotext page is copied into req->buffer.
 467  *
 468  * Return value: 0 if successful
 469  */
 470 static inline int saa5246a_get_page(struct saa5246a_device *t,
 471         vtx_pagereq_t *req)
 472 {
 473         int start, end, size;
 474         char *buf;
 475         int err;
 476
 477         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
 478             req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
 479                 return -EINVAL;
 480
 481         buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
 482         if (!buf)
 483                 return -ENOMEM;
 484
 485         /* Read "normal" part of page */
 486         err = -EIO;
 487
 488         end = min(req->end, VTX_PAGESIZE - 1);
 489         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 490                         req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
 491                         ROW(req->start), COLUMN(req->start), COMMAND_END))
 492                 goto out;
 493         if (i2c_getdata(t, end - req->start + 1, buf))
 494                 goto out;
 495         err = -EFAULT;
 496         if (copy_to_user(req->buffer, buf, end - req->start + 1))
 497                 goto out;
 498
 499         /* Always get the time from buffer 4, since this stupid SAA5246A only
 500          * updates the currently displayed buffer...
 501          */
 502         if (REQ_CONTAINS_TIME(req)) {
 503                 start = max(req->start, POS_TIME_START);
 504                 end   = min(req->end,   POS_TIME_END);
 505                 size = end - start + 1;
 506                 err = -EINVAL;
 507                 if (size < 0)
 508                         goto out;
 509                 err = -EIO;
 510                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 511                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 512                                 R9_CURSER_ROW_0, start, COMMAND_END))
 513                         goto out;
 514                 if (i2c_getdata(t, size, buf))
 515                         goto out;
 516                 err = -EFAULT;
 517                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 518                         goto out;
 519         }
 520         /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
 521         if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
 522                 start = max(req->start, POS_HEADER_START);
 523                 end   = min(req->end,   POS_HEADER_END);
 524                 size = end - start + 1;
 525                 err = -EINVAL;
 526                 if (size < 0)
 527                         goto out;
 528                 err = -EIO;
 529                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 530                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 531                                 R9_CURSER_ROW_0, start, COMMAND_END))
 532                         goto out;
 533                 if (i2c_getdata(t, end - start + 1, buf))
 534                         goto out;
 535                 err = -EFAULT;
 536                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 537                         goto out;
 538         }
 539         err = 0;
 540 out:
 541         kfree(buf);
 542         return err;
 543 }
 544
 545 /* Stops the acquisition circuit given in dau_no. The page buffer associated
 546  * with this acquisition circuit will no more be updated. The other daus are
 547  * not affected.
 548  *
 549  * Return value: 0 if successful
 550  */
 551 static inline int saa5246a_stop_dau(struct saa5246a_device *t,
 552     unsigned char dau_no)
 553 {
 554         if (dau_no >= NUM_DAUS)
 555                 return -EINVAL;
 556         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 557
 558                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 559                 dau_no << 4 |
 560                 R2_BANK_0 |
 561                 R2_HAMMING_CHECK_OFF,
 562
 563                 R3_PAGE_HUNDREDS_0 |
 564                 R3_HOLD_PAGE |
 565                 R3_PAGE_HUNDREDS_DO_NOT_CARE,
 566
 567                 COMMAND_END))
 568         {
 569                 return -EIO;
 570         }
 571         t->is_searching[dau_no] = false;
 572         return 0;
 573 }
 574
 575 /*  Handles ioctls defined in videotext.h
 576  *
 577  *  Returns 0 if successful
 578  */
 579 static int do_saa5246a_ioctl(struct inode *inode, struct file *file,
 580                             unsigned int cmd, void *arg)
 581 {
 582         struct video_device *vd = video_devdata(file);
 583         struct saa5246a_device *t=vd->priv;
 584         switch(cmd)
 585         {
 586                 case VTXIOCGETINFO:
 587                 {
 588                         vtx_info_t *info = arg;
 589
 590                         info->version_major = MAJOR_VERSION;
 591                         info->version_minor = MINOR_VERSION;
 592                         info->numpages = NUM_DAUS;
 593                         return 0;
 594                 }
 595
 596                 case VTXIOCCLRPAGE:
 597                 {
 598                         vtx_pagereq_t *req = arg;
 599
 600                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 601                                 return -EINVAL;
 602                         memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0]));
 603                         return 0;
 604                 }
 605
 606                 case VTXIOCCLRFOUND:
 607                 {
 608                         vtx_pagereq_t *req = arg;
 609
 610                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 611                                 return -EINVAL;
 612                         return(saa5246a_clear_found_bit(t, req->pgbuf));
 613                 }
 614
 615                 case VTXIOCPAGEREQ:
 616                 {
 617                         vtx_pagereq_t *req = arg;
 618
 619                         return(saa5246a_request_page(t, req));
 620                 }
 621
 622                 case VTXIOCGETSTAT:
 623                 {
 624                         vtx_pagereq_t *req = arg;
 625                         vtx_pageinfo_t info;
 626                         int rval;
 627
 628                         if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
 629                                 return rval;
 630                         if(copy_to_user(req->buffer, &info,
 631                                 sizeof(vtx_pageinfo_t)))
 632                                 return -EFAULT;
 633                         return 0;
 634                 }
 635
 636                 case VTXIOCGETPAGE:
 637                 {
 638                         vtx_pagereq_t *req = arg;
 639
 640                         return(saa5246a_get_page(t, req));
 641                 }
 642
 643                 case VTXIOCSTOPDAU:
 644                 {
 645                         vtx_pagereq_t *req = arg;
 646
 647                         return(saa5246a_stop_dau(t, req->pgbuf));
 648                 }
 649
 650                 case VTXIOCPUTPAGE:
 651                 case VTXIOCSETDISP:
 652                 case VTXIOCPUTSTAT:
 653                         return 0;
 654
 655                 case VTXIOCCLRCACHE:
 656                 {
 657                         return 0;
 658                 }
 659
 660                 case VTXIOCSETVIRT:
 661                 {
 662                         /* I do not know what "virtual mode" means */
 663                         return 0;
 664                 }
 665         }
 666         return -EINVAL;
 667 }
 668
 669 /*
 670  * Translates old vtx IOCTLs to new ones
 671  *
 672  * This keeps new kernel versions compatible with old userspace programs.
 673  */
 674 static inline unsigned int vtx_fix_command(unsigned int cmd)
 675 {
 676         switch (cmd) {
 677         case VTXIOCGETINFO_OLD:
 678                 cmd = VTXIOCGETINFO;
 679                 break;
 680         case VTXIOCCLRPAGE_OLD:
 681                 cmd = VTXIOCCLRPAGE;
 682                 break;
 683         case VTXIOCCLRFOUND_OLD:
 684                 cmd = VTXIOCCLRFOUND;
 685                 break;
 686         case VTXIOCPAGEREQ_OLD:
 687                 cmd = VTXIOCPAGEREQ;
 688                 break;
 689         case VTXIOCGETSTAT_OLD:
 690                 cmd = VTXIOCGETSTAT;
 691                 break;
 692         case VTXIOCGETPAGE_OLD:
 693                 cmd = VTXIOCGETPAGE;
 694                 break;
 695         case VTXIOCSTOPDAU_OLD:
 696                 cmd = VTXIOCSTOPDAU;
 697                 break;
 698         case VTXIOCPUTPAGE_OLD:
 699                 cmd = VTXIOCPUTPAGE;
 700                 break;
 701         case VTXIOCSETDISP_OLD:
 702                 cmd = VTXIOCSETDISP;
 703                 break;
 704         case VTXIOCPUTSTAT_OLD:
 705                 cmd = VTXIOCPUTSTAT;
 706                 break;
 707         case VTXIOCCLRCACHE_OLD:
 708                 cmd = VTXIOCCLRCACHE;
 709                 break;
 710         case VTXIOCSETVIRT_OLD:
 711                 cmd = VTXIOCSETVIRT;
 712                 break;
 713         }
 714         return cmd;
 715 }
 716
 717 /*
 718  *      Handle the locking
 719  */
 720 static int saa5246a_ioctl(struct inode *inode, struct file *file,
 721                          unsigned int cmd, unsigned long arg)
 722 {
 723         struct video_device *vd = video_devdata(file);
 724         struct saa5246a_device *t = vd->priv;
 725         int err;
 726
 727         cmd = vtx_fix_command(cmd);
 728         mutex_lock(&t->lock);
 729         err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
 730         mutex_unlock(&t->lock);
 731         return err;
 732 }
 733
 734 static int saa5246a_open(struct inode *inode, struct file *file)
 735 {
 736         struct video_device *vd = video_devdata(file);
 737         struct saa5246a_device *t = vd->priv;
 738         int err;
 739
 740         err = video_exclusive_open(inode,file);
 741         if (err < 0)
 742                 return err;
 743
 744         if (t->client==NULL) {
 745                 err = -ENODEV;
 746                 goto fail;
 747         }
 748
 749         if (i2c_senddata(t, SAA5246A_REGISTER_R0,
 750
 751                 R0_SELECT_R11 |
 752                 R0_PLL_TIME_CONSTANT_LONG |
 753                 R0_ENABLE_nODD_EVEN_OUTPUT |
 754                 R0_ENABLE_HDR_POLL |
 755                 R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
 756                 R0_NO_FREE_RUN_PLL |
 757                 R0_NO_AUTOMATIC_FASTEXT_PROMPT,
 758
 759                 R1_NON_INTERLACED_312_312_LINES |
 760                 R1_DEW |
 761                 R1_EXTENDED_PACKET_DISABLE |
 762                 R1_DAUS_ALL_ON |
 763                 R1_8_BITS_NO_PARITY |
 764                 R1_VCS_TO_SCS,
 765
 766                 COMMAND_END) ||
 767                 i2c_senddata(t, SAA5246A_REGISTER_R4,
 768
 769                 /* We do not care much for the TV display but nevertheless we
 770                  * need the currently displayed page later because only on that
 771                  * page the time is updated. */
 772                 R4_DISPLAY_PAGE_4,
 773
 774                 COMMAND_END))
 775         {
 776                 err = -EIO;
 777                 goto fail;
 778         }
 779
 780         return 0;
 781
 782 fail:
 783         video_exclusive_release(inode,file);
 784         return err;
 785 }
 786
 787 static int saa5246a_release(struct inode *inode, struct file *file)
 788 {
 789         struct video_device *vd = video_devdata(file);
 790         struct saa5246a_device *t = vd->priv;
 791
 792         /* Stop all acquisition circuits. */
 793         i2c_senddata(t, SAA5246A_REGISTER_R1,
 794
 795                 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
 796                 R1_DEW |
 797                 R1_EXTENDED_PACKET_DISABLE |
 798                 R1_DAUS_ALL_OFF |
 799                 R1_8_BITS_NO_PARITY |
 800                 R1_VCS_TO_SCS,
 801
 802                 COMMAND_END);
 803         video_exclusive_release(inode,file);
 804         return 0;
 805 }
 806
 807 static int __init init_saa_5246a (void)
 808 {
 809         printk(KERN_INFO
 810                 "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
 811                 MAJOR_VERSION, MINOR_VERSION);
 812         return i2c_add_driver(&i2c_driver_videotext);
 813 }
 814
 815 static void __exit cleanup_saa_5246a (void)
 816 {
 817         i2c_del_driver(&i2c_driver_videotext);
 818 }
 819
 820 module_init(init_saa_5246a);
 821 module_exit(cleanup_saa_5246a);
 822
 823 static const struct file_operations saa_fops = {
 824         .owner   = THIS_MODULE,
 825         .open    = saa5246a_open,
 826         .release = saa5246a_release,
 827         .ioctl   = saa5246a_ioctl,
 828         .llseek  = no_llseek,
 829 };
 830
 831 static struct video_device saa_template =
 832 {
 833         .name     = IF_NAME,
 834         .fops     = &saa_fops,
 835         .release  = video_device_release,
 836         .minor    = -1,
 837 };