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RT-AC56 3.0.0.4.374.37 core
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / media / video / saa5246a.c
blob6b3b09ef89787cbc86830dae1f269c391cd534a3
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/slab.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 };
1041
1042 static int saa5246a_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
1043 {
1044 struct i2c_client *client = v4l2_get_subdevdata(sd);
1045
1046 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_SAA5246A, 0);
1047 }
1048
1049 static const struct v4l2_subdev_core_ops saa5246a_core_ops = {
1050 .g_chip_ident = saa5246a_g_chip_ident,
1051 };
1052
1053 static const struct v4l2_subdev_ops saa5246a_ops = {
1054 .core = &saa5246a_core_ops,
1055 };
1056
1057
1058 static int saa5246a_probe(struct i2c_client *client,
1059 const struct i2c_device_id *id)
1060 {
1061 int pgbuf;
1062 int err;
1063 struct saa5246a_device *t;
1064 struct v4l2_subdev *sd;
1065
1066 v4l_info(client, "chip found @ 0x%x (%s)\n",
1067 client->addr << 1, client->adapter->name);
1068 v4l_info(client, "VideoText version %d.%d\n",
1069 MAJOR_VERSION, MINOR_VERSION);
1070 t = kzalloc(sizeof(*t), GFP_KERNEL);
1071 if (t == NULL)
1072 return -ENOMEM;
1073 sd = &t->sd;
1074 v4l2_i2c_subdev_init(sd, client, &saa5246a_ops);
1075 mutex_init(&t->lock);
1076
1077 /* Now create a video4linux device */
1078 t->vdev = video_device_alloc();
1079 if (t->vdev == NULL) {
1080 kfree(t);
1081 return -ENOMEM;
1082 }
1083 memcpy(t->vdev, &saa_template, sizeof(*t->vdev));
1084
1085 for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) {
1086 memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
1087 t->is_searching[pgbuf] = false;
1088 }
1089 video_set_drvdata(t->vdev, t);
1090
1091 /* Register it */
1092 err = video_register_device(t->vdev, VFL_TYPE_VTX, -1);
1093 if (err < 0) {
1094 video_device_release(t->vdev);
1095 kfree(t);
1096 return err;
1097 }
1098 return 0;
1099 }
1100
1101 static int saa5246a_remove(struct i2c_client *client)
1102 {
1103 struct v4l2_subdev *sd = i2c_get_clientdata(client);
1104 struct saa5246a_device *t = to_dev(sd);
1105
1106 video_unregister_device(t->vdev);
1107 v4l2_device_unregister_subdev(sd);
1108 kfree(t);
1109 return 0;
1110 }
1111
1112 static const struct i2c_device_id saa5246a_id[] = {
1113 { "saa5246a", 0 },
1114 { }
1115 };
1116 MODULE_DEVICE_TABLE(i2c, saa5246a_id);
1117
1118 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
1119 .name = "saa5246a",
1120 .probe = saa5246a_probe,
1121 .remove = saa5246a_remove,
1122 .id_table = saa5246a_id,
1123 };
Tomato firmware and modifications.