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@lxorguk.ukuu.org.uk>
  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/smp_lock.h>
  47 #include <linux/mutex.h>
  48 #include <linux/videotext.h>
  49 #include <linux/videodev2.h>
  50 #include <media/v4l2-device.h>
  51 #include <media/v4l2-chip-ident.h>
  52 #include <media/v4l2-ioctl.h>
  53 #include <media/v4l2-i2c-drv.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 #define MAJOR_VERSION 1         /* driver major version number */
  60 #define MINOR_VERSION 8         /* driver minor version number */
  61
  62 /* Number of DAUs = number of pages that can be searched at the same time. */
  63 #define NUM_DAUS 4
  64
  65 #define NUM_ROWS_PER_PAGE 40
  66
  67 /* first column is 0 (not 1) */
  68 #define POS_TIME_START 32
  69 #define POS_TIME_END 39
  70
  71 #define POS_HEADER_START 7
  72 #define POS_HEADER_END 31
  73
  74 /* Returns 'true' if the part of the videotext page described with req contains
  75    (at least parts of) the time field */
  76 #define REQ_CONTAINS_TIME(p_req) \
  77         ((p_req)->start <= POS_TIME_END && \
  78          (p_req)->end   >= POS_TIME_START)
  79
  80 /* Returns 'true' if the part of the videotext page described with req contains
  81    (at least parts of) the page header */
  82 #define REQ_CONTAINS_HEADER(p_req) \
  83         ((p_req)->start <= POS_HEADER_END && \
  84          (p_req)->end   >= POS_HEADER_START)
  85
  86 /*****************************************************************************/
  87 /* Mode register numbers of the SAA5246A                                     */
  88 /*****************************************************************************/
  89 #define SAA5246A_REGISTER_R0    0
  90 #define SAA5246A_REGISTER_R1    1
  91 #define SAA5246A_REGISTER_R2    2
  92 #define SAA5246A_REGISTER_R3    3
  93 #define SAA5246A_REGISTER_R4    4
  94 #define SAA5246A_REGISTER_R5    5
  95 #define SAA5246A_REGISTER_R6    6
  96 #define SAA5246A_REGISTER_R7    7
  97 #define SAA5246A_REGISTER_R8    8
  98 #define SAA5246A_REGISTER_R9    9
  99 #define SAA5246A_REGISTER_R10  10
 100 #define SAA5246A_REGISTER_R11  11
 101 #define SAA5246A_REGISTER_R11B 11
 102
 103 /* SAA5246A mode registers often autoincrement to the next register.
 104    Therefore we use variable argument lists. The following macro indicates
 105    the end of a command list. */
 106 #define COMMAND_END (-1)
 107
 108 /*****************************************************************************/
 109 /* Contents of the mode registers of the SAA5246A                            */
 110 /*****************************************************************************/
 111 /* Register R0 (Advanced Control) */
 112 #define R0_SELECT_R11                                      0x00
 113 #define R0_SELECT_R11B                                     0x01
 114
 115 #define R0_PLL_TIME_CONSTANT_LONG                          0x00
 116 #define R0_PLL_TIME_CONSTANT_SHORT                         0x02
 117
 118 #define R0_ENABLE_nODD_EVEN_OUTPUT                         0x00
 119 #define R0_DISABLE_nODD_EVEN_OUTPUT                        0x04
 120
 121 #define R0_ENABLE_HDR_POLL                                 0x00
 122 #define R0_DISABLE_HDR_POLL                                0x10
 123
 124 #define R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED 0x00
 125 #define R0_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED        0x20
 126
 127 #define R0_NO_FREE_RUN_PLL                                 0x00
 128 #define R0_FREE_RUN_PLL                                    0x40
 129
 130 #define R0_NO_AUTOMATIC_FASTEXT_PROMPT                     0x00
 131 #define R0_AUTOMATIC_FASTEXT_PROMPT                        0x80
 132
 133 /* Register R1 (Mode) */
 134 #define R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES      0x00
 135 #define R1_NON_INTERLACED_312_313_LINES                    0x01
 136 #define R1_NON_INTERLACED_312_312_LINES                    0x02
 137 #define R1_FFB_LEADING_EDGE_IN_FIRST_BROAD_PULSE           0x03
 138 #define R1_FFB_LEADING_EDGE_IN_SECOND_BROAD_PULSE          0x07
 139
 140 #define R1_DEW                                             0x00
 141 #define R1_FULL_FIELD                                      0x08
 142
 143 #define R1_EXTENDED_PACKET_DISABLE                         0x00
 144 #define R1_EXTENDED_PACKET_ENABLE                          0x10
 145
 146 #define R1_DAUS_ALL_ON                                     0x00
 147 #define R1_DAUS_ALL_OFF                                    0x20
 148
 149 #define R1_7_BITS_PLUS_PARITY                              0x00
 150 #define R1_8_BITS_NO_PARITY                                0x40
 151
 152 #define R1_VCS_TO_SCS                                      0x00
 153 #define R1_NO_VCS_TO_SCS                                   0x80
 154
 155 /* Register R2 (Page request address) */
 156 #define R2_IN_R3_SELECT_PAGE_HUNDREDS                      0x00
 157 #define R2_IN_R3_SELECT_PAGE_TENS                          0x01
 158 #define R2_IN_R3_SELECT_PAGE_UNITS                         0x02
 159 #define R2_IN_R3_SELECT_HOURS_TENS                         0x03
 160 #define R2_IN_R3_SELECT_HOURS_UNITS                        0x04
 161 #define R2_IN_R3_SELECT_MINUTES_TENS                       0x05
 162 #define R2_IN_R3_SELECT_MINUTES_UNITS                      0x06
 163
 164 #define R2_DAU_0                                           0x00
 165 #define R2_DAU_1                                           0x10
 166 #define R2_DAU_2                                           0x20
 167 #define R2_DAU_3                                           0x30
 168
 169 #define R2_BANK_0                                          0x00
 170 #define R2_BANK 1                                          0x40
 171
 172 #define R2_HAMMING_CHECK_ON                                0x80
 173 #define R2_HAMMING_CHECK_OFF                               0x00
 174
 175 /* Register R3 (Page request data) */
 176 #define R3_PAGE_HUNDREDS_0                                 0x00
 177 #define R3_PAGE_HUNDREDS_1                                 0x01
 178 #define R3_PAGE_HUNDREDS_2                                 0x02
 179 #define R3_PAGE_HUNDREDS_3                                 0x03
 180 #define R3_PAGE_HUNDREDS_4                                 0x04
 181 #define R3_PAGE_HUNDREDS_5                                 0x05
 182 #define R3_PAGE_HUNDREDS_6                                 0x06
 183 #define R3_PAGE_HUNDREDS_7                                 0x07
 184
 185 #define R3_HOLD_PAGE                                       0x00
 186 #define R3_UPDATE_PAGE                                     0x08
 187
 188 #define R3_PAGE_HUNDREDS_DO_NOT_CARE                       0x00
 189 #define R3_PAGE_HUNDREDS_DO_CARE                           0x10
 190
 191 #define R3_PAGE_TENS_DO_NOT_CARE                           0x00
 192 #define R3_PAGE_TENS_DO_CARE                               0x10
 193
 194 #define R3_PAGE_UNITS_DO_NOT_CARE                          0x00
 195 #define R3_PAGE_UNITS_DO_CARE                              0x10
 196
 197 #define R3_HOURS_TENS_DO_NOT_CARE                          0x00
 198 #define R3_HOURS_TENS_DO_CARE                              0x10
 199
 200 #define R3_HOURS_UNITS_DO_NOT_CARE                         0x00
 201 #define R3_HOURS_UNITS_DO_CARE                             0x10
 202
 203 #define R3_MINUTES_TENS_DO_NOT_CARE                        0x00
 204 #define R3_MINUTES_TENS_DO_CARE                            0x10
 205
 206 #define R3_MINUTES_UNITS_DO_NOT_CARE                       0x00
 207 #define R3_MINUTES_UNITS_DO_CARE                           0x10
 208
 209 /* Register R4 (Display chapter) */
 210 #define R4_DISPLAY_PAGE_0                                  0x00
 211 #define R4_DISPLAY_PAGE_1                                  0x01
 212 #define R4_DISPLAY_PAGE_2                                  0x02
 213 #define R4_DISPLAY_PAGE_3                                  0x03
 214 #define R4_DISPLAY_PAGE_4                                  0x04
 215 #define R4_DISPLAY_PAGE_5                                  0x05
 216 #define R4_DISPLAY_PAGE_6                                  0x06
 217 #define R4_DISPLAY_PAGE_7                                  0x07
 218
 219 /* Register R5 (Normal display control) */
 220 #define R5_PICTURE_INSIDE_BOXING_OFF                       0x00
 221 #define R5_PICTURE_INSIDE_BOXING_ON                        0x01
 222
 223 #define R5_PICTURE_OUTSIDE_BOXING_OFF                      0x00
 224 #define R5_PICTURE_OUTSIDE_BOXING_ON                       0x02
 225
 226 #define R5_TEXT_INSIDE_BOXING_OFF                          0x00
 227 #define R5_TEXT_INSIDE_BOXING_ON                           0x04
 228
 229 #define R5_TEXT_OUTSIDE_BOXING_OFF                         0x00
 230 #define R5_TEXT_OUTSIDE_BOXING_ON                          0x08
 231
 232 #define R5_CONTRAST_REDUCTION_INSIDE_BOXING_OFF            0x00
 233 #define R5_CONTRAST_REDUCTION_INSIDE_BOXING_ON             0x10
 234
 235 #define R5_CONTRAST_REDUCTION_OUTSIDE_BOXING_OFF           0x00
 236 #define R5_CONTRAST_REDUCTION_OUTSIDE_BOXING_ON            0x20
 237
 238 #define R5_BACKGROUND_COLOR_INSIDE_BOXING_OFF              0x00
 239 #define R5_BACKGROUND_COLOR_INSIDE_BOXING_ON               0x40
 240
 241 #define R5_BACKGROUND_COLOR_OUTSIDE_BOXING_OFF             0x00
 242 #define R5_BACKGROUND_COLOR_OUTSIDE_BOXING_ON              0x80
 243
 244 /* Register R6 (Newsflash display) */
 245 #define R6_NEWSFLASH_PICTURE_INSIDE_BOXING_OFF             0x00
 246 #define R6_NEWSFLASH_PICTURE_INSIDE_BOXING_ON              0x01
 247
 248 #define R6_NEWSFLASH_PICTURE_OUTSIDE_BOXING_OFF            0x00
 249 #define R6_NEWSFLASH_PICTURE_OUTSIDE_BOXING_ON             0x02
 250
 251 #define R6_NEWSFLASH_TEXT_INSIDE_BOXING_OFF                0x00
 252 #define R6_NEWSFLASH_TEXT_INSIDE_BOXING_ON                 0x04
 253
 254 #define R6_NEWSFLASH_TEXT_OUTSIDE_BOXING_OFF               0x00
 255 #define R6_NEWSFLASH_TEXT_OUTSIDE_BOXING_ON                0x08
 256
 257 #define R6_NEWSFLASH_CONTRAST_REDUCTION_INSIDE_BOXING_OFF  0x00
 258 #define R6_NEWSFLASH_CONTRAST_REDUCTION_INSIDE_BOXING_ON   0x10
 259
 260 #define R6_NEWSFLASH_CONTRAST_REDUCTION_OUTSIDE_BOXING_OFF 0x00
 261 #define R6_NEWSFLASH_CONTRAST_REDUCTION_OUTSIDE_BOXING_ON  0x20
 262
 263 #define R6_NEWSFLASH_BACKGROUND_COLOR_INSIDE_BOXING_OFF    0x00
 264 #define R6_NEWSFLASH_BACKGROUND_COLOR_INSIDE_BOXING_ON     0x40
 265
 266 #define R6_NEWSFLASH_BACKGROUND_COLOR_OUTSIDE_BOXING_OFF   0x00
 267 #define R6_NEWSFLASH_BACKGROUND_COLOR_OUTSIDE_BOXING_ON    0x80
 268
 269 /* Register R7 (Display mode) */
 270 #define R7_BOX_OFF_ROW_0                                   0x00
 271 #define R7_BOX_ON_ROW_0                                    0x01
 272
 273 #define R7_BOX_OFF_ROW_1_TO_23                             0x00
 274 #define R7_BOX_ON_ROW_1_TO_23                              0x02
 275
 276 #define R7_BOX_OFF_ROW_24                                  0x00
 277 #define R7_BOX_ON_ROW_24                                   0x04
 278
 279 #define R7_SINGLE_HEIGHT                                   0x00
 280 #define R7_DOUBLE_HEIGHT                                   0x08
 281
 282 #define R7_TOP_HALF                                        0x00
 283 #define R7_BOTTOM_HALF                                     0x10
 284
 285 #define R7_REVEAL_OFF                                      0x00
 286 #define R7_REVEAL_ON                                       0x20
 287
 288 #define R7_CURSER_OFF                                      0x00
 289 #define R7_CURSER_ON                                       0x40
 290
 291 #define R7_STATUS_BOTTOM                                   0x00
 292 #define R7_STATUS_TOP                                      0x80
 293
 294 /* Register R8 (Active chapter) */
 295 #define R8_ACTIVE_CHAPTER_0                                0x00
 296 #define R8_ACTIVE_CHAPTER_1                                0x01
 297 #define R8_ACTIVE_CHAPTER_2                                0x02
 298 #define R8_ACTIVE_CHAPTER_3                                0x03
 299 #define R8_ACTIVE_CHAPTER_4                                0x04
 300 #define R8_ACTIVE_CHAPTER_5                                0x05
 301 #define R8_ACTIVE_CHAPTER_6                                0x06
 302 #define R8_ACTIVE_CHAPTER_7                                0x07
 303
 304 #define R8_CLEAR_MEMORY                                    0x08
 305 #define R8_DO_NOT_CLEAR_MEMORY                             0x00
 306
 307 /* Register R9 (Curser row) */
 308 #define R9_CURSER_ROW_0                                    0x00
 309 #define R9_CURSER_ROW_1                                    0x01
 310 #define R9_CURSER_ROW_2                                    0x02
 311 #define R9_CURSER_ROW_25                                   0x19
 312
 313 /* Register R10 (Curser column) */
 314 #define R10_CURSER_COLUMN_0                                0x00
 315 #define R10_CURSER_COLUMN_6                                0x06
 316 #define R10_CURSER_COLUMN_8                                0x08
 317
 318 /*****************************************************************************/
 319 /* Row 25 control data in column 0 to 9                                      */
 320 /*****************************************************************************/
 321 #define ROW25_COLUMN0_PAGE_UNITS                           0x0F
 322
 323 #define ROW25_COLUMN1_PAGE_TENS                            0x0F
 324
 325 #define ROW25_COLUMN2_MINUTES_UNITS                        0x0F
 326
 327 #define ROW25_COLUMN3_MINUTES_TENS                         0x07
 328 #define ROW25_COLUMN3_DELETE_PAGE                          0x08
 329
 330 #define ROW25_COLUMN4_HOUR_UNITS                           0x0F
 331
 332 #define ROW25_COLUMN5_HOUR_TENS                            0x03
 333 #define ROW25_COLUMN5_INSERT_HEADLINE                      0x04
 334 #define ROW25_COLUMN5_INSERT_SUBTITLE                      0x08
 335
 336 #define ROW25_COLUMN6_SUPPRESS_HEADER                      0x01
 337 #define ROW25_COLUMN6_UPDATE_PAGE                          0x02
 338 #define ROW25_COLUMN6_INTERRUPTED_SEQUENCE                 0x04
 339 #define ROW25_COLUMN6_SUPPRESS_DISPLAY                     0x08
 340
 341 #define ROW25_COLUMN7_SERIAL_MODE                          0x01
 342 #define ROW25_COLUMN7_CHARACTER_SET                        0x0E
 343
 344 #define ROW25_COLUMN8_PAGE_HUNDREDS                        0x07
 345 #define ROW25_COLUMN8_PAGE_NOT_FOUND                       0x10
 346
 347 #define ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR                0x20
 348
 349 #define ROW25_COLUMN0_TO_7_HAMMING_ERROR                   0x10
 350
 351 /*****************************************************************************/
 352 /* Helper macros for extracting page, hour and minute digits                 */
 353 /*****************************************************************************/
 354 /* BYTE_POS  0 is at row 0, column 0,
 355    BYTE_POS  1 is at row 0, column 1,
 356    BYTE_POS 40 is at row 1, column 0, (with NUM_ROWS_PER_PAGE = 40)
 357    BYTE_POS 41 is at row 1, column 1, (with NUM_ROWS_PER_PAGE = 40),
 358    ... */
 359 #define ROW(BYTE_POS)    (BYTE_POS / NUM_ROWS_PER_PAGE)
 360 #define COLUMN(BYTE_POS) (BYTE_POS % NUM_ROWS_PER_PAGE)
 361
 362 /*****************************************************************************/
 363 /* Helper macros for extracting page, hour and minute digits                 */
 364 /*****************************************************************************/
 365 /* Macros for extracting hundreds, tens and units of a page number which
 366    must be in the range 0 ... 0x799.
 367    Note that page is coded in hexadecimal, i.e. 0x123 means page 123.
 368    page 0x.. means page 8.. */
 369 #define HUNDREDS_OF_PAGE(page) (((page) / 0x100) & 0x7)
 370 #define TENS_OF_PAGE(page)     (((page) / 0x10)  & 0xF)
 371 #define UNITS_OF_PAGE(page)     ((page) & 0xF)
 372
 373 /* Macros for extracting tens and units of a hour information which
 374    must be in the range 0 ... 0x24.
 375    Note that hour is coded in hexadecimal, i.e. 0x12 means 12 hours */
 376 #define TENS_OF_HOUR(hour)  ((hour) / 0x10)
 377 #define UNITS_OF_HOUR(hour) ((hour) & 0xF)
 378
 379 /* Macros for extracting tens and units of a minute information which
 380    must be in the range 0 ... 0x59.
 381    Note that minute is coded in hexadecimal, i.e. 0x12 means 12 minutes */
 382 #define TENS_OF_MINUTE(minute)  ((minute) / 0x10)
 383 #define UNITS_OF_MINUTE(minute) ((minute) & 0xF)
 384
 385 #define HOUR_MAX   0x23
 386 #define MINUTE_MAX 0x59
 387 #define PAGE_MAX   0x8FF
 388
 389
 390 struct saa5246a_device
 391 {
 392         struct v4l2_subdev sd;
 393         struct video_device *vdev;
 394         u8     pgbuf[NUM_DAUS][VTX_VIRTUALSIZE];
 395         int    is_searching[NUM_DAUS];
 396         unsigned long in_use;
 397         struct mutex lock;
 398 };
 399
 400 static inline struct saa5246a_device *to_dev(struct v4l2_subdev *sd)
 401 {
 402         return container_of(sd, struct saa5246a_device, sd);
 403 }
 404
 405 static struct video_device saa_template;        /* Declared near bottom */
 406
 407 /*
 408  *      I2C interfaces
 409  */
 410
 411 static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
 412 {
 413         struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
 414         char buf[64];
 415
 416         buf[0] = reg;
 417         memcpy(buf+1, data, count);
 418
 419         if (i2c_master_send(client, buf, count + 1) == count + 1)
 420                 return 0;
 421         return -1;
 422 }
 423
 424 static int i2c_senddata(struct saa5246a_device *t, ...)
 425 {
 426         unsigned char buf[64];
 427         int v;
 428         int ct = 0;
 429         va_list argp;
 430         va_start(argp, t);
 431
 432         while ((v = va_arg(argp, int)) != -1)
 433                 buf[ct++] = v;
 434
 435         va_end(argp);
 436         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 437 }
 438
 439 /* Get count number of bytes from I²C-device at address adr, store them in buf.
 440  * Start & stop handshaking is done by this routine, ack will be sent after the
 441  * last byte to inhibit further sending of data. If uaccess is 'true', data is
 442  * written to user-space with put_user. Returns -1 if I²C-device didn't send
 443  * acknowledge, 0 otherwise
 444  */
 445 static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
 446 {
 447         struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
 448
 449         if (i2c_master_recv(client, buf, count) != count)
 450                 return -1;
 451         return 0;
 452 }
 453
 454 /* When a page is found then the not FOUND bit in one of the status registers
 455  * of the SAA5264A chip is cleared. Unfortunately this bit is not set
 456  * automatically when a new page is requested. Instead this function must be
 457  * called after a page has been requested.
 458  *
 459  * Return value: 0 if successful
 460  */
 461 static int saa5246a_clear_found_bit(struct saa5246a_device *t,
 462         unsigned char dau_no)
 463 {
 464         unsigned char row_25_column_8;
 465
 466         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 467
 468                 dau_no |
 469                 R8_DO_NOT_CLEAR_MEMORY,
 470
 471                 R9_CURSER_ROW_25,
 472
 473                 R10_CURSER_COLUMN_8,
 474
 475                 COMMAND_END) ||
 476                 i2c_getdata(t, 1, &row_25_column_8))
 477         {
 478                 return -EIO;
 479         }
 480         row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
 481         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 482
 483                 dau_no |
 484                 R8_DO_NOT_CLEAR_MEMORY,
 485
 486                 R9_CURSER_ROW_25,
 487
 488                 R10_CURSER_COLUMN_8,
 489
 490                 row_25_column_8,
 491
 492                 COMMAND_END))
 493         {
 494                 return -EIO;
 495         }
 496
 497         return 0;
 498 }
 499
 500 /* Requests one videotext page as described in req. The fields of req are
 501  * checked and an error is returned if something is invalid.
 502  *
 503  * Return value: 0 if successful
 504  */
 505 static int saa5246a_request_page(struct saa5246a_device *t,
 506     vtx_pagereq_t *req)
 507 {
 508         if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
 509                 return -EINVAL;
 510         if (req->pagemask & PGMASK_PAGE)
 511                 if (req->page < 0 || req->page > PAGE_MAX)
 512                         return -EINVAL;
 513         if (req->pagemask & PGMASK_HOUR)
 514                 if (req->hour < 0 || req->hour > HOUR_MAX)
 515                         return -EINVAL;
 516         if (req->pagemask & PGMASK_MINUTE)
 517                 if (req->minute < 0 || req->minute > MINUTE_MAX)
 518                         return -EINVAL;
 519         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 520                 return -EINVAL;
 521
 522         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 523
 524                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 525                 req->pgbuf << 4 |
 526                 R2_BANK_0 |
 527                 R2_HAMMING_CHECK_OFF,
 528
 529                 HUNDREDS_OF_PAGE(req->page) |
 530                 R3_HOLD_PAGE |
 531                 (req->pagemask & PG_HUND ?
 532                         R3_PAGE_HUNDREDS_DO_CARE :
 533                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 534
 535                 TENS_OF_PAGE(req->page) |
 536                 (req->pagemask & PG_TEN ?
 537                         R3_PAGE_TENS_DO_CARE :
 538                         R3_PAGE_TENS_DO_NOT_CARE),
 539
 540                 UNITS_OF_PAGE(req->page) |
 541                 (req->pagemask & PG_UNIT ?
 542                         R3_PAGE_UNITS_DO_CARE :
 543                         R3_PAGE_UNITS_DO_NOT_CARE),
 544
 545                 TENS_OF_HOUR(req->hour) |
 546                 (req->pagemask & HR_TEN ?
 547                         R3_HOURS_TENS_DO_CARE :
 548                         R3_HOURS_TENS_DO_NOT_CARE),
 549
 550                 UNITS_OF_HOUR(req->hour) |
 551                 (req->pagemask & HR_UNIT ?
 552                         R3_HOURS_UNITS_DO_CARE :
 553                         R3_HOURS_UNITS_DO_NOT_CARE),
 554
 555                 TENS_OF_MINUTE(req->minute) |
 556                 (req->pagemask & MIN_TEN ?
 557                         R3_MINUTES_TENS_DO_CARE :
 558                         R3_MINUTES_TENS_DO_NOT_CARE),
 559
 560                 UNITS_OF_MINUTE(req->minute) |
 561                 (req->pagemask & MIN_UNIT ?
 562                         R3_MINUTES_UNITS_DO_CARE :
 563                         R3_MINUTES_UNITS_DO_NOT_CARE),
 564
 565                 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
 566
 567                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 568                 req->pgbuf << 4 |
 569                 R2_BANK_0 |
 570                 R2_HAMMING_CHECK_OFF,
 571
 572                 HUNDREDS_OF_PAGE(req->page) |
 573                 R3_UPDATE_PAGE |
 574                 (req->pagemask & PG_HUND ?
 575                         R3_PAGE_HUNDREDS_DO_CARE :
 576                         R3_PAGE_HUNDREDS_DO_NOT_CARE),
 577
 578                 COMMAND_END))
 579         {
 580                 return -EIO;
 581         }
 582
 583         t->is_searching[req->pgbuf] = true;
 584         return 0;
 585 }
 586
 587 /* This routine decodes the page number from the infobits contained in line 25.
 588  *
 589  * Parameters:
 590  * infobits: must be bits 0 to 9 of column 25
 591  *
 592  * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
 593  */
 594 static inline int saa5246a_extract_pagenum_from_infobits(
 595     unsigned char infobits[10])
 596 {
 597         int page_hundreds, page_tens, page_units;
 598
 599         page_units    = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
 600         page_tens     = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
 601         page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
 602
 603         /* page 0x.. means page 8.. */
 604         if (page_hundreds == 0)
 605                 page_hundreds = 8;
 606
 607         return((page_hundreds << 8) | (page_tens << 4) | page_units);
 608 }
 609
 610 /* Decodes the hour from the infobits contained in line 25.
 611  *
 612  * Parameters:
 613  * infobits: must be bits 0 to 9 of column 25
 614  *
 615  * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
 616  */
 617 static inline int saa5246a_extract_hour_from_infobits(
 618     unsigned char infobits[10])
 619 {
 620         int hour_tens, hour_units;
 621
 622         hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
 623         hour_tens  = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
 624
 625         return((hour_tens << 4) | hour_units);
 626 }
 627
 628 /* Decodes the minutes from the infobits contained in line 25.
 629  *
 630  * Parameters:
 631  * infobits: must be bits 0 to 9 of column 25
 632  *
 633  * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
 634  */
 635 static inline int saa5246a_extract_minutes_from_infobits(
 636     unsigned char infobits[10])
 637 {
 638         int minutes_tens, minutes_units;
 639
 640         minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
 641         minutes_tens  = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
 642
 643         return((minutes_tens << 4) | minutes_units);
 644 }
 645
 646 /* Reads the status bits contained in the first 10 columns of the first line
 647  * and extracts the information into info.
 648  *
 649  * Return value: 0 if successful
 650  */
 651 static inline int saa5246a_get_status(struct saa5246a_device *t,
 652     vtx_pageinfo_t *info, unsigned char dau_no)
 653 {
 654         unsigned char infobits[10];
 655         int column;
 656
 657         if (dau_no >= NUM_DAUS)
 658                 return -EINVAL;
 659
 660         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 661
 662                 dau_no |
 663                 R8_DO_NOT_CLEAR_MEMORY,
 664
 665                 R9_CURSER_ROW_25,
 666
 667                 R10_CURSER_COLUMN_0,
 668
 669                 COMMAND_END) ||
 670                 i2c_getdata(t, 10, infobits))
 671         {
 672                 return -EIO;
 673         }
 674
 675         info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
 676         info->hour    = saa5246a_extract_hour_from_infobits(infobits);
 677         info->minute  = saa5246a_extract_minutes_from_infobits(infobits);
 678         info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
 679         info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
 680         info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
 681         info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
 682         info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
 683         info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
 684         info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
 685         info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
 686         info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
 687         info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
 688         info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
 689         info->hamming = 0;
 690         for (column = 0; column <= 7; column++) {
 691                 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
 692                         info->hamming = 1;
 693                         break;
 694                 }
 695         }
 696         if (!info->hamming && !info->notfound)
 697                 t->is_searching[dau_no] = false;
 698         return 0;
 699 }
 700
 701 /* Reads 1 videotext page buffer of the SAA5246A.
 702  *
 703  * req is used both as input and as output. It contains information which part
 704  * must be read. The videotext page is copied into req->buffer.
 705  *
 706  * Return value: 0 if successful
 707  */
 708 static inline int saa5246a_get_page(struct saa5246a_device *t,
 709         vtx_pagereq_t *req)
 710 {
 711         int start, end, size;
 712         char *buf;
 713         int err;
 714
 715         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
 716             req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
 717                 return -EINVAL;
 718
 719         buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
 720         if (!buf)
 721                 return -ENOMEM;
 722
 723         /* Read "normal" part of page */
 724         err = -EIO;
 725
 726         end = min(req->end, VTX_PAGESIZE - 1);
 727         if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 728                         req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
 729                         ROW(req->start), COLUMN(req->start), COMMAND_END))
 730                 goto out;
 731         if (i2c_getdata(t, end - req->start + 1, buf))
 732                 goto out;
 733         err = -EFAULT;
 734         if (copy_to_user(req->buffer, buf, end - req->start + 1))
 735                 goto out;
 736
 737         /* Always get the time from buffer 4, since this stupid SAA5246A only
 738          * updates the currently displayed buffer...
 739          */
 740         if (REQ_CONTAINS_TIME(req)) {
 741                 start = max(req->start, POS_TIME_START);
 742                 end   = min(req->end,   POS_TIME_END);
 743                 size = end - start + 1;
 744                 err = -EINVAL;
 745                 if (size < 0)
 746                         goto out;
 747                 err = -EIO;
 748                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 749                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 750                                 R9_CURSER_ROW_0, start, COMMAND_END))
 751                         goto out;
 752                 if (i2c_getdata(t, size, buf))
 753                         goto out;
 754                 err = -EFAULT;
 755                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 756                         goto out;
 757         }
 758         /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
 759         if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
 760                 start = max(req->start, POS_HEADER_START);
 761                 end   = min(req->end,   POS_HEADER_END);
 762                 size = end - start + 1;
 763                 err = -EINVAL;
 764                 if (size < 0)
 765                         goto out;
 766                 err = -EIO;
 767                 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
 768                                 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
 769                                 R9_CURSER_ROW_0, start, COMMAND_END))
 770                         goto out;
 771                 if (i2c_getdata(t, end - start + 1, buf))
 772                         goto out;
 773                 err = -EFAULT;
 774                 if (copy_to_user(req->buffer + start - req->start, buf, size))
 775                         goto out;
 776         }
 777         err = 0;
 778 out:
 779         kfree(buf);
 780         return err;
 781 }
 782
 783 /* Stops the acquisition circuit given in dau_no. The page buffer associated
 784  * with this acquisition circuit will no more be updated. The other daus are
 785  * not affected.
 786  *
 787  * Return value: 0 if successful
 788  */
 789 static inline int saa5246a_stop_dau(struct saa5246a_device *t,
 790     unsigned char dau_no)
 791 {
 792         if (dau_no >= NUM_DAUS)
 793                 return -EINVAL;
 794         if (i2c_senddata(t, SAA5246A_REGISTER_R2,
 795
 796                 R2_IN_R3_SELECT_PAGE_HUNDREDS |
 797                 dau_no << 4 |
 798                 R2_BANK_0 |
 799                 R2_HAMMING_CHECK_OFF,
 800
 801                 R3_PAGE_HUNDREDS_0 |
 802                 R3_HOLD_PAGE |
 803                 R3_PAGE_HUNDREDS_DO_NOT_CARE,
 804
 805                 COMMAND_END))
 806         {
 807                 return -EIO;
 808         }
 809         t->is_searching[dau_no] = false;
 810         return 0;
 811 }
 812
 813 /*  Handles ioctls defined in videotext.h
 814  *
 815  *  Returns 0 if successful
 816  */
 817 static long do_saa5246a_ioctl(struct file *file, unsigned int cmd, void *arg)
 818 {
 819         struct saa5246a_device *t = video_drvdata(file);
 820
 821         switch(cmd)
 822         {
 823                 case VTXIOCGETINFO:
 824                 {
 825                         vtx_info_t *info = arg;
 826
 827                         info->version_major = MAJOR_VERSION;
 828                         info->version_minor = MINOR_VERSION;
 829                         info->numpages = NUM_DAUS;
 830                         return 0;
 831                 }
 832
 833                 case VTXIOCCLRPAGE:
 834                 {
 835                         vtx_pagereq_t *req = arg;
 836
 837                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 838                                 return -EINVAL;
 839                         memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0]));
 840                         return 0;
 841                 }
 842
 843                 case VTXIOCCLRFOUND:
 844                 {
 845                         vtx_pagereq_t *req = arg;
 846
 847                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 848                                 return -EINVAL;
 849                         return(saa5246a_clear_found_bit(t, req->pgbuf));
 850                 }
 851
 852                 case VTXIOCPAGEREQ:
 853                 {
 854                         vtx_pagereq_t *req = arg;
 855
 856                         return(saa5246a_request_page(t, req));
 857                 }
 858
 859                 case VTXIOCGETSTAT:
 860                 {
 861                         vtx_pagereq_t *req = arg;
 862                         vtx_pageinfo_t info;
 863                         int rval;
 864
 865                         if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
 866                                 return rval;
 867                         if(copy_to_user(req->buffer, &info,
 868                                 sizeof(vtx_pageinfo_t)))
 869                                 return -EFAULT;
 870                         return 0;
 871                 }
 872
 873                 case VTXIOCGETPAGE:
 874                 {
 875                         vtx_pagereq_t *req = arg;
 876
 877                         return(saa5246a_get_page(t, req));
 878                 }
 879
 880                 case VTXIOCSTOPDAU:
 881                 {
 882                         vtx_pagereq_t *req = arg;
 883
 884                         return(saa5246a_stop_dau(t, req->pgbuf));
 885                 }
 886
 887                 case VTXIOCPUTPAGE:
 888                 case VTXIOCSETDISP:
 889                 case VTXIOCPUTSTAT:
 890                         return 0;
 891
 892                 case VTXIOCCLRCACHE:
 893                 {
 894                         return 0;
 895                 }
 896
 897                 case VTXIOCSETVIRT:
 898                 {
 899                         /* I do not know what "virtual mode" means */
 900                         return 0;
 901                 }
 902         }
 903         return -EINVAL;
 904 }
 905
 906 /*
 907  * Translates old vtx IOCTLs to new ones
 908  *
 909  * This keeps new kernel versions compatible with old userspace programs.
 910  */
 911 static inline unsigned int vtx_fix_command(unsigned int cmd)
 912 {
 913         switch (cmd) {
 914         case VTXIOCGETINFO_OLD:
 915                 cmd = VTXIOCGETINFO;
 916                 break;
 917         case VTXIOCCLRPAGE_OLD:
 918                 cmd = VTXIOCCLRPAGE;
 919                 break;
 920         case VTXIOCCLRFOUND_OLD:
 921                 cmd = VTXIOCCLRFOUND;
 922                 break;
 923         case VTXIOCPAGEREQ_OLD:
 924                 cmd = VTXIOCPAGEREQ;
 925                 break;
 926         case VTXIOCGETSTAT_OLD:
 927                 cmd = VTXIOCGETSTAT;
 928                 break;
 929         case VTXIOCGETPAGE_OLD:
 930                 cmd = VTXIOCGETPAGE;
 931                 break;
 932         case VTXIOCSTOPDAU_OLD:
 933                 cmd = VTXIOCSTOPDAU;
 934                 break;
 935         case VTXIOCPUTPAGE_OLD:
 936                 cmd = VTXIOCPUTPAGE;
 937                 break;
 938         case VTXIOCSETDISP_OLD:
 939                 cmd = VTXIOCSETDISP;
 940                 break;
 941         case VTXIOCPUTSTAT_OLD:
 942                 cmd = VTXIOCPUTSTAT;
 943                 break;
 944         case VTXIOCCLRCACHE_OLD:
 945                 cmd = VTXIOCCLRCACHE;
 946                 break;
 947         case VTXIOCSETVIRT_OLD:
 948                 cmd = VTXIOCSETVIRT;
 949                 break;
 950         }
 951         return cmd;
 952 }
 953
 954 /*
 955  *      Handle the locking
 956  */
 957 static long saa5246a_ioctl(struct file *file,
 958                          unsigned int cmd, unsigned long arg)
 959 {
 960         struct saa5246a_device *t = video_drvdata(file);
 961         long err;
 962
 963         cmd = vtx_fix_command(cmd);
 964         mutex_lock(&t->lock);
 965         err = video_usercopy(file, cmd, arg, do_saa5246a_ioctl);
 966         mutex_unlock(&t->lock);
 967         return err;
 968 }
 969
 970 static int saa5246a_open(struct file *file)
 971 {
 972         struct saa5246a_device *t = video_drvdata(file);
 973
 974         if (test_and_set_bit(0, &t->in_use))
 975                 return -EBUSY;
 976
 977         if (i2c_senddata(t, SAA5246A_REGISTER_R0,
 978                 R0_SELECT_R11 |
 979                 R0_PLL_TIME_CONSTANT_LONG |
 980                 R0_ENABLE_nODD_EVEN_OUTPUT |
 981                 R0_ENABLE_HDR_POLL |
 982                 R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
 983                 R0_NO_FREE_RUN_PLL |
 984                 R0_NO_AUTOMATIC_FASTEXT_PROMPT,
 985
 986                 R1_NON_INTERLACED_312_312_LINES |
 987                 R1_DEW |
 988                 R1_EXTENDED_PACKET_DISABLE |
 989                 R1_DAUS_ALL_ON |
 990                 R1_8_BITS_NO_PARITY |
 991                 R1_VCS_TO_SCS,
 992
 993                 COMMAND_END) ||
 994                 i2c_senddata(t, SAA5246A_REGISTER_R4,
 995
 996                 /* We do not care much for the TV display but nevertheless we
 997                  * need the currently displayed page later because only on that
 998                  * page the time is updated. */
 999                 R4_DISPLAY_PAGE_4,
1000
1001                 COMMAND_END))
1002         {
1003                 clear_bit(0, &t->in_use);
1004                 return -EIO;
1005         }
1006         return 0;
1007 }
1008
1009 static int saa5246a_release(struct file *file)
1010 {
1011         struct saa5246a_device *t = video_drvdata(file);
1012
1013         /* Stop all acquisition circuits. */
1014         i2c_senddata(t, SAA5246A_REGISTER_R1,
1015
1016                 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
1017                 R1_DEW |
1018                 R1_EXTENDED_PACKET_DISABLE |
1019                 R1_DAUS_ALL_OFF |
1020                 R1_8_BITS_NO_PARITY |
1021                 R1_VCS_TO_SCS,
1022
1023                 COMMAND_END);
1024         clear_bit(0, &t->in_use);
1025         return 0;
1026 }
1027
1028 static const struct v4l2_file_operations saa_fops = {
1029         .owner   = THIS_MODULE,
1030         .open    = saa5246a_open,
1031         .release = saa5246a_release,
1032         .ioctl   = saa5246a_ioctl,
1033 };
1034
1035 static struct video_device saa_template =
1036 {
1037         .name     = "saa5246a",
1038         .fops     = &saa_fops,
1039         .release  = video_device_release,
1040         .minor    = -1,
1041 };
1042
1043 static int saa5246a_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
1044 {
1045         struct i2c_client *client = v4l2_get_subdevdata(sd);
1046
1047         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_SAA5246A, 0);
1048 }
1049
1050 static const struct v4l2_subdev_core_ops saa5246a_core_ops = {
1051         .g_chip_ident = saa5246a_g_chip_ident,
1052 };
1053
1054 static const struct v4l2_subdev_ops saa5246a_ops = {
1055         .core = &saa5246a_core_ops,
1056 };
1057
1058
1059 static int saa5246a_probe(struct i2c_client *client,
1060                         const struct i2c_device_id *id)
1061 {
1062         int pgbuf;
1063         int err;
1064         struct saa5246a_device *t;
1065         struct v4l2_subdev *sd;
1066
1067         v4l_info(client, "chip found @ 0x%x (%s)\n",
1068                         client->addr << 1, client->adapter->name);
1069         v4l_info(client, "VideoText version %d.%d\n",
1070                         MAJOR_VERSION, MINOR_VERSION);
1071         t = kzalloc(sizeof(*t), GFP_KERNEL);
1072         if (t == NULL)
1073                 return -ENOMEM;
1074         sd = &t->sd;
1075         v4l2_i2c_subdev_init(sd, client, &saa5246a_ops);
1076         mutex_init(&t->lock);
1077
1078         /* Now create a video4linux device */
1079         t->vdev = video_device_alloc();
1080         if (t->vdev == NULL) {
1081                 kfree(t);
1082                 return -ENOMEM;
1083         }
1084         memcpy(t->vdev, &saa_template, sizeof(*t->vdev));
1085
1086         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) {
1087                 memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
1088                 t->is_searching[pgbuf] = false;
1089         }
1090         video_set_drvdata(t->vdev, t);
1091
1092         /* Register it */
1093         err = video_register_device(t->vdev, VFL_TYPE_VTX, -1);
1094         if (err < 0) {
1095                 video_device_release(t->vdev);
1096                 kfree(t);
1097                 return err;
1098         }
1099         return 0;
1100 }
1101
1102 static int saa5246a_remove(struct i2c_client *client)
1103 {
1104         struct v4l2_subdev *sd = i2c_get_clientdata(client);
1105         struct saa5246a_device *t = to_dev(sd);
1106
1107         video_unregister_device(t->vdev);
1108         v4l2_device_unregister_subdev(sd);
1109         kfree(t);
1110         return 0;
1111 }
1112
1113 static const struct i2c_device_id saa5246a_id[] = {
1114         { "saa5246a", 0 },
1115         { }
1116 };
1117 MODULE_DEVICE_TABLE(i2c, saa5246a_id);
1118
1119 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
1120         .name = "saa5246a",
1121         .probe = saa5246a_probe,
1122         .remove = saa5246a_remove,
1123         .id_table = saa5246a_id,
1124 };