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OMAP3: PM: decouple PER and CORE context save and restore
[linux-ginger.git] / drivers / media / video / saa5246a.c
blobb624a4c01fdc9faee6e2fe37ad0939da9fdbfee2
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/mutex.h>
47 #include <linux/videotext.h>
48 #include <linux/videodev2.h>
49 #include <media/v4l2-device.h>
50 #include <media/v4l2-chip-ident.h>
51 #include <media/v4l2-ioctl.h>
52 #include <media/v4l2-i2c-drv.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 #define MAJOR_VERSION 1 /* driver major version number */
59 #define MINOR_VERSION 8 /* driver minor version number */
60
61 /* Number of DAUs = number of pages that can be searched at the same time. */
62 #define NUM_DAUS 4
63
64 #define NUM_ROWS_PER_PAGE 40
65
66 /* first column is 0 (not 1) */
67 #define POS_TIME_START 32
68 #define POS_TIME_END 39
69
70 #define POS_HEADER_START 7
71 #define POS_HEADER_END 31
72
73 /* Returns 'true' if the part of the videotext page described with req contains
74 (at least parts of) the time field */
75 #define REQ_CONTAINS_TIME(p_req) \
76 ((p_req)->start <= POS_TIME_END && \
77 (p_req)->end >= POS_TIME_START)
78
79 /* Returns 'true' if the part of the videotext page described with req contains
80 (at least parts of) the page header */
81 #define REQ_CONTAINS_HEADER(p_req) \
82 ((p_req)->start <= POS_HEADER_END && \
83 (p_req)->end >= POS_HEADER_START)
84
85 /*****************************************************************************/
86 /* Mode register numbers of the SAA5246A */
87 /*****************************************************************************/
88 #define SAA5246A_REGISTER_R0 0
89 #define SAA5246A_REGISTER_R1 1
90 #define SAA5246A_REGISTER_R2 2
91 #define SAA5246A_REGISTER_R3 3
92 #define SAA5246A_REGISTER_R4 4
93 #define SAA5246A_REGISTER_R5 5
94 #define SAA5246A_REGISTER_R6 6
95 #define SAA5246A_REGISTER_R7 7
96 #define SAA5246A_REGISTER_R8 8
97 #define SAA5246A_REGISTER_R9 9
98 #define SAA5246A_REGISTER_R10 10
99 #define SAA5246A_REGISTER_R11 11
100 #define SAA5246A_REGISTER_R11B 11
101
102 /* SAA5246A mode registers often autoincrement to the next register.
103 Therefore we use variable argument lists. The following macro indicates
104 the end of a command list. */
105 #define COMMAND_END (-1)
106
107 /*****************************************************************************/
108 /* Contents of the mode registers of the SAA5246A */
109 /*****************************************************************************/
110 /* Register R0 (Advanced Control) */
111 #define R0_SELECT_R11 0x00
112 #define R0_SELECT_R11B 0x01
113
114 #define R0_PLL_TIME_CONSTANT_LONG 0x00
115 #define R0_PLL_TIME_CONSTANT_SHORT 0x02
116
117 #define R0_ENABLE_nODD_EVEN_OUTPUT 0x00
118 #define R0_DISABLE_nODD_EVEN_OUTPUT 0x04
119
120 #define R0_ENABLE_HDR_POLL 0x00
121 #define R0_DISABLE_HDR_POLL 0x10
122
123 #define R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED 0x00
124 #define R0_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED 0x20
125
126 #define R0_NO_FREE_RUN_PLL 0x00
127 #define R0_FREE_RUN_PLL 0x40
128
129 #define R0_NO_AUTOMATIC_FASTEXT_PROMPT 0x00
130 #define R0_AUTOMATIC_FASTEXT_PROMPT 0x80
131
132 /* Register R1 (Mode) */
133 #define R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES 0x00
134 #define R1_NON_INTERLACED_312_313_LINES 0x01
135 #define R1_NON_INTERLACED_312_312_LINES 0x02
136 #define R1_FFB_LEADING_EDGE_IN_FIRST_BROAD_PULSE 0x03
137 #define R1_FFB_LEADING_EDGE_IN_SECOND_BROAD_PULSE 0x07
138
139 #define R1_DEW 0x00
140 #define R1_FULL_FIELD 0x08
141
142 #define R1_EXTENDED_PACKET_DISABLE 0x00
143 #define R1_EXTENDED_PACKET_ENABLE 0x10
144
145 #define R1_DAUS_ALL_ON 0x00
146 #define R1_DAUS_ALL_OFF 0x20
147
148 #define R1_7_BITS_PLUS_PARITY 0x00
149 #define R1_8_BITS_NO_PARITY 0x40
150
151 #define R1_VCS_TO_SCS 0x00
152 #define R1_NO_VCS_TO_SCS 0x80
153
154 /* Register R2 (Page request address) */
155 #define R2_IN_R3_SELECT_PAGE_HUNDREDS 0x00
156 #define R2_IN_R3_SELECT_PAGE_TENS 0x01
157 #define R2_IN_R3_SELECT_PAGE_UNITS 0x02
158 #define R2_IN_R3_SELECT_HOURS_TENS 0x03
159 #define R2_IN_R3_SELECT_HOURS_UNITS 0x04
160 #define R2_IN_R3_SELECT_MINUTES_TENS 0x05
161 #define R2_IN_R3_SELECT_MINUTES_UNITS 0x06
162
163 #define R2_DAU_0 0x00
164 #define R2_DAU_1 0x10
165 #define R2_DAU_2 0x20
166 #define R2_DAU_3 0x30
167
168 #define R2_BANK_0 0x00
169 #define R2_BANK 1 0x40
170
171 #define R2_HAMMING_CHECK_ON 0x80
172 #define R2_HAMMING_CHECK_OFF 0x00
173
174 /* Register R3 (Page request data) */
175 #define R3_PAGE_HUNDREDS_0 0x00
176 #define R3_PAGE_HUNDREDS_1 0x01
177 #define R3_PAGE_HUNDREDS_2 0x02
178 #define R3_PAGE_HUNDREDS_3 0x03
179 #define R3_PAGE_HUNDREDS_4 0x04
180 #define R3_PAGE_HUNDREDS_5 0x05
181 #define R3_PAGE_HUNDREDS_6 0x06
182 #define R3_PAGE_HUNDREDS_7 0x07
183
184 #define R3_HOLD_PAGE 0x00
185 #define R3_UPDATE_PAGE 0x08
186
187 #define R3_PAGE_HUNDREDS_DO_NOT_CARE 0x00
188 #define R3_PAGE_HUNDREDS_DO_CARE 0x10
189
190 #define R3_PAGE_TENS_DO_NOT_CARE 0x00
191 #define R3_PAGE_TENS_DO_CARE 0x10
192
193 #define R3_PAGE_UNITS_DO_NOT_CARE 0x00
194 #define R3_PAGE_UNITS_DO_CARE 0x10
195
196 #define R3_HOURS_TENS_DO_NOT_CARE 0x00
197 #define R3_HOURS_TENS_DO_CARE 0x10
198
199 #define R3_HOURS_UNITS_DO_NOT_CARE 0x00
200 #define R3_HOURS_UNITS_DO_CARE 0x10
201
202 #define R3_MINUTES_TENS_DO_NOT_CARE 0x00
203 #define R3_MINUTES_TENS_DO_CARE 0x10
204
205 #define R3_MINUTES_UNITS_DO_NOT_CARE 0x00
206 #define R3_MINUTES_UNITS_DO_CARE 0x10
207
208 /* Register R4 (Display chapter) */
209 #define R4_DISPLAY_PAGE_0 0x00
210 #define R4_DISPLAY_PAGE_1 0x01
211 #define R4_DISPLAY_PAGE_2 0x02
212 #define R4_DISPLAY_PAGE_3 0x03
213 #define R4_DISPLAY_PAGE_4 0x04
214 #define R4_DISPLAY_PAGE_5 0x05
215 #define R4_DISPLAY_PAGE_6 0x06
216 #define R4_DISPLAY_PAGE_7 0x07
217
218 /* Register R5 (Normal display control) */
219 #define R5_PICTURE_INSIDE_BOXING_OFF 0x00
220 #define R5_PICTURE_INSIDE_BOXING_ON 0x01
221
222 #define R5_PICTURE_OUTSIDE_BOXING_OFF 0x00
223 #define R5_PICTURE_OUTSIDE_BOXING_ON 0x02
224
225 #define R5_TEXT_INSIDE_BOXING_OFF 0x00
226 #define R5_TEXT_INSIDE_BOXING_ON 0x04
227
228 #define R5_TEXT_OUTSIDE_BOXING_OFF 0x00
229 #define R5_TEXT_OUTSIDE_BOXING_ON 0x08
230
231 #define R5_CONTRAST_REDUCTION_INSIDE_BOXING_OFF 0x00
232 #define R5_CONTRAST_REDUCTION_INSIDE_BOXING_ON 0x10
233
234 #define R5_CONTRAST_REDUCTION_OUTSIDE_BOXING_OFF 0x00
235 #define R5_CONTRAST_REDUCTION_OUTSIDE_BOXING_ON 0x20
236
237 #define R5_BACKGROUND_COLOR_INSIDE_BOXING_OFF 0x00
238 #define R5_BACKGROUND_COLOR_INSIDE_BOXING_ON 0x40
239
240 #define R5_BACKGROUND_COLOR_OUTSIDE_BOXING_OFF 0x00
241 #define R5_BACKGROUND_COLOR_OUTSIDE_BOXING_ON 0x80
242
243 /* Register R6 (Newsflash display) */
244 #define R6_NEWSFLASH_PICTURE_INSIDE_BOXING_OFF 0x00
245 #define R6_NEWSFLASH_PICTURE_INSIDE_BOXING_ON 0x01
246
247 #define R6_NEWSFLASH_PICTURE_OUTSIDE_BOXING_OFF 0x00
248 #define R6_NEWSFLASH_PICTURE_OUTSIDE_BOXING_ON 0x02
249
250 #define R6_NEWSFLASH_TEXT_INSIDE_BOXING_OFF 0x00
251 #define R6_NEWSFLASH_TEXT_INSIDE_BOXING_ON 0x04
252
253 #define R6_NEWSFLASH_TEXT_OUTSIDE_BOXING_OFF 0x00
254 #define R6_NEWSFLASH_TEXT_OUTSIDE_BOXING_ON 0x08
255
256 #define R6_NEWSFLASH_CONTRAST_REDUCTION_INSIDE_BOXING_OFF 0x00
257 #define R6_NEWSFLASH_CONTRAST_REDUCTION_INSIDE_BOXING_ON 0x10
258
259 #define R6_NEWSFLASH_CONTRAST_REDUCTION_OUTSIDE_BOXING_OFF 0x00
260 #define R6_NEWSFLASH_CONTRAST_REDUCTION_OUTSIDE_BOXING_ON 0x20
261
262 #define R6_NEWSFLASH_BACKGROUND_COLOR_INSIDE_BOXING_OFF 0x00
263 #define R6_NEWSFLASH_BACKGROUND_COLOR_INSIDE_BOXING_ON 0x40
264
265 #define R6_NEWSFLASH_BACKGROUND_COLOR_OUTSIDE_BOXING_OFF 0x00
266 #define R6_NEWSFLASH_BACKGROUND_COLOR_OUTSIDE_BOXING_ON 0x80
267
268 /* Register R7 (Display mode) */
269 #define R7_BOX_OFF_ROW_0 0x00
270 #define R7_BOX_ON_ROW_0 0x01
271
272 #define R7_BOX_OFF_ROW_1_TO_23 0x00
273 #define R7_BOX_ON_ROW_1_TO_23 0x02
274
275 #define R7_BOX_OFF_ROW_24 0x00
276 #define R7_BOX_ON_ROW_24 0x04
277
278 #define R7_SINGLE_HEIGHT 0x00
279 #define R7_DOUBLE_HEIGHT 0x08
280
281 #define R7_TOP_HALF 0x00
282 #define R7_BOTTOM_HALF 0x10
283
284 #define R7_REVEAL_OFF 0x00
285 #define R7_REVEAL_ON 0x20
286
287 #define R7_CURSER_OFF 0x00
288 #define R7_CURSER_ON 0x40
289
290 #define R7_STATUS_BOTTOM 0x00
291 #define R7_STATUS_TOP 0x80
292
293 /* Register R8 (Active chapter) */
294 #define R8_ACTIVE_CHAPTER_0 0x00
295 #define R8_ACTIVE_CHAPTER_1 0x01
296 #define R8_ACTIVE_CHAPTER_2 0x02
297 #define R8_ACTIVE_CHAPTER_3 0x03
298 #define R8_ACTIVE_CHAPTER_4 0x04
299 #define R8_ACTIVE_CHAPTER_5 0x05
300 #define R8_ACTIVE_CHAPTER_6 0x06
301 #define R8_ACTIVE_CHAPTER_7 0x07
302
303 #define R8_CLEAR_MEMORY 0x08
304 #define R8_DO_NOT_CLEAR_MEMORY 0x00
305
306 /* Register R9 (Curser row) */
307 #define R9_CURSER_ROW_0 0x00
308 #define R9_CURSER_ROW_1 0x01
309 #define R9_CURSER_ROW_2 0x02
310 #define R9_CURSER_ROW_25 0x19
311
312 /* Register R10 (Curser column) */
313 #define R10_CURSER_COLUMN_0 0x00
314 #define R10_CURSER_COLUMN_6 0x06
315 #define R10_CURSER_COLUMN_8 0x08
316
317 /*****************************************************************************/
318 /* Row 25 control data in column 0 to 9 */
319 /*****************************************************************************/
320 #define ROW25_COLUMN0_PAGE_UNITS 0x0F
321
322 #define ROW25_COLUMN1_PAGE_TENS 0x0F
323
324 #define ROW25_COLUMN2_MINUTES_UNITS 0x0F
325
326 #define ROW25_COLUMN3_MINUTES_TENS 0x07
327 #define ROW25_COLUMN3_DELETE_PAGE 0x08
328
329 #define ROW25_COLUMN4_HOUR_UNITS 0x0F
330
331 #define ROW25_COLUMN5_HOUR_TENS 0x03
332 #define ROW25_COLUMN5_INSERT_HEADLINE 0x04
333 #define ROW25_COLUMN5_INSERT_SUBTITLE 0x08
334
335 #define ROW25_COLUMN6_SUPPRESS_HEADER 0x01
336 #define ROW25_COLUMN6_UPDATE_PAGE 0x02
337 #define ROW25_COLUMN6_INTERRUPTED_SEQUENCE 0x04
338 #define ROW25_COLUMN6_SUPPRESS_DISPLAY 0x08
339
340 #define ROW25_COLUMN7_SERIAL_MODE 0x01
341 #define ROW25_COLUMN7_CHARACTER_SET 0x0E
342
343 #define ROW25_COLUMN8_PAGE_HUNDREDS 0x07
344 #define ROW25_COLUMN8_PAGE_NOT_FOUND 0x10
345
346 #define ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR 0x20
347
348 #define ROW25_COLUMN0_TO_7_HAMMING_ERROR 0x10
349
350 /*****************************************************************************/
351 /* Helper macros for extracting page, hour and minute digits */
352 /*****************************************************************************/
353 /* BYTE_POS 0 is at row 0, column 0,
354 BYTE_POS 1 is at row 0, column 1,
355 BYTE_POS 40 is at row 1, column 0, (with NUM_ROWS_PER_PAGE = 40)
356 BYTE_POS 41 is at row 1, column 1, (with NUM_ROWS_PER_PAGE = 40),
357 ... */
358 #define ROW(BYTE_POS) (BYTE_POS / NUM_ROWS_PER_PAGE)
359 #define COLUMN(BYTE_POS) (BYTE_POS % NUM_ROWS_PER_PAGE)
360
361 /*****************************************************************************/
362 /* Helper macros for extracting page, hour and minute digits */
363 /*****************************************************************************/
364 /* Macros for extracting hundreds, tens and units of a page number which
365 must be in the range 0 ... 0x799.
366 Note that page is coded in hexadecimal, i.e. 0x123 means page 123.
367 page 0x.. means page 8.. */
368 #define HUNDREDS_OF_PAGE(page) (((page) / 0x100) & 0x7)
369 #define TENS_OF_PAGE(page) (((page) / 0x10) & 0xF)
370 #define UNITS_OF_PAGE(page) ((page) & 0xF)
371
372 /* Macros for extracting tens and units of a hour information which
373 must be in the range 0 ... 0x24.
374 Note that hour is coded in hexadecimal, i.e. 0x12 means 12 hours */
375 #define TENS_OF_HOUR(hour) ((hour) / 0x10)
376 #define UNITS_OF_HOUR(hour) ((hour) & 0xF)
377
378 /* Macros for extracting tens and units of a minute information which
379 must be in the range 0 ... 0x59.
380 Note that minute is coded in hexadecimal, i.e. 0x12 means 12 minutes */
381 #define TENS_OF_MINUTE(minute) ((minute) / 0x10)
382 #define UNITS_OF_MINUTE(minute) ((minute) & 0xF)
383
384 #define HOUR_MAX 0x23
385 #define MINUTE_MAX 0x59
386 #define PAGE_MAX 0x8FF
387
388
389 struct saa5246a_device
390 {
391 struct v4l2_subdev sd;
392 struct video_device *vdev;
393 u8 pgbuf[NUM_DAUS][VTX_VIRTUALSIZE];
394 int is_searching[NUM_DAUS];
395 unsigned long in_use;
396 struct mutex lock;
397 };
398
399 static inline struct saa5246a_device *to_dev(struct v4l2_subdev *sd)
400 {
401 return container_of(sd, struct saa5246a_device, sd);
402 }
403
404 static struct video_device saa_template; /* Declared near bottom */
405
406 /*
407 * I2C interfaces
408 */
409
410 static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
411 {
412 struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
413 char buf[64];
414
415 buf[0] = reg;
416 memcpy(buf+1, data, count);
417
418 if (i2c_master_send(client, buf, count + 1) == count + 1)
419 return 0;
420 return -1;
421 }
422
423 static int i2c_senddata(struct saa5246a_device *t, ...)
424 {
425 unsigned char buf[64];
426 int v;
427 int ct = 0;
428 va_list argp;
429 va_start(argp, t);
430
431 while ((v = va_arg(argp, int)) != -1)
432 buf[ct++] = v;
433
434 va_end(argp);
435 return i2c_sendbuf(t, buf[0], ct-1, buf+1);
436 }
437
438 /* Get count number of bytes from I²C-device at address adr, store them in buf.
439 * Start & stop handshaking is done by this routine, ack will be sent after the
440 * last byte to inhibit further sending of data. If uaccess is 'true', data is
441 * written to user-space with put_user. Returns -1 if I²C-device didn't send
442 * acknowledge, 0 otherwise
443 */
444 static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
445 {
446 struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
447
448 if (i2c_master_recv(client, buf, count) != count)
449 return -1;
450 return 0;
451 }
452
453 /* When a page is found then the not FOUND bit in one of the status registers
454 * of the SAA5264A chip is cleared. Unfortunately this bit is not set
455 * automatically when a new page is requested. Instead this function must be
456 * called after a page has been requested.
457 *
458 * Return value: 0 if successful
459 */
460 static int saa5246a_clear_found_bit(struct saa5246a_device *t,
461 unsigned char dau_no)
462 {
463 unsigned char row_25_column_8;
464
465 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
466
467 dau_no |
468 R8_DO_NOT_CLEAR_MEMORY,
469
470 R9_CURSER_ROW_25,
471
472 R10_CURSER_COLUMN_8,
473
474 COMMAND_END) ||
475 i2c_getdata(t, 1, &row_25_column_8))
476 {
477 return -EIO;
478 }
479 row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
480 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
481
482 dau_no |
483 R8_DO_NOT_CLEAR_MEMORY,
484
485 R9_CURSER_ROW_25,
486
487 R10_CURSER_COLUMN_8,
488
489 row_25_column_8,
490
491 COMMAND_END))
492 {
493 return -EIO;
494 }
495
496 return 0;
497 }
498
499 /* Requests one videotext page as described in req. The fields of req are
500 * checked and an error is returned if something is invalid.
501 *
502 * Return value: 0 if successful
503 */
504 static int saa5246a_request_page(struct saa5246a_device *t,
505 vtx_pagereq_t *req)
506 {
507 if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
508 return -EINVAL;
509 if (req->pagemask & PGMASK_PAGE)
510 if (req->page < 0 || req->page > PAGE_MAX)
511 return -EINVAL;
512 if (req->pagemask & PGMASK_HOUR)
513 if (req->hour < 0 || req->hour > HOUR_MAX)
514 return -EINVAL;
515 if (req->pagemask & PGMASK_MINUTE)
516 if (req->minute < 0 || req->minute > MINUTE_MAX)
517 return -EINVAL;
518 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
519 return -EINVAL;
520
521 if (i2c_senddata(t, SAA5246A_REGISTER_R2,
522
523 R2_IN_R3_SELECT_PAGE_HUNDREDS |
524 req->pgbuf << 4 |
525 R2_BANK_0 |
526 R2_HAMMING_CHECK_OFF,
527
528 HUNDREDS_OF_PAGE(req->page) |
529 R3_HOLD_PAGE |
530 (req->pagemask & PG_HUND ?
531 R3_PAGE_HUNDREDS_DO_CARE :
532 R3_PAGE_HUNDREDS_DO_NOT_CARE),
533
534 TENS_OF_PAGE(req->page) |
535 (req->pagemask & PG_TEN ?
536 R3_PAGE_TENS_DO_CARE :
537 R3_PAGE_TENS_DO_NOT_CARE),
538
539 UNITS_OF_PAGE(req->page) |
540 (req->pagemask & PG_UNIT ?
541 R3_PAGE_UNITS_DO_CARE :
542 R3_PAGE_UNITS_DO_NOT_CARE),
543
544 TENS_OF_HOUR(req->hour) |
545 (req->pagemask & HR_TEN ?
546 R3_HOURS_TENS_DO_CARE :
547 R3_HOURS_TENS_DO_NOT_CARE),
548
549 UNITS_OF_HOUR(req->hour) |
550 (req->pagemask & HR_UNIT ?
551 R3_HOURS_UNITS_DO_CARE :
552 R3_HOURS_UNITS_DO_NOT_CARE),
553
554 TENS_OF_MINUTE(req->minute) |
555 (req->pagemask & MIN_TEN ?
556 R3_MINUTES_TENS_DO_CARE :
557 R3_MINUTES_TENS_DO_NOT_CARE),
558
559 UNITS_OF_MINUTE(req->minute) |
560 (req->pagemask & MIN_UNIT ?
561 R3_MINUTES_UNITS_DO_CARE :
562 R3_MINUTES_UNITS_DO_NOT_CARE),
563
564 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
565
566 R2_IN_R3_SELECT_PAGE_HUNDREDS |
567 req->pgbuf << 4 |
568 R2_BANK_0 |
569 R2_HAMMING_CHECK_OFF,
570
571 HUNDREDS_OF_PAGE(req->page) |
572 R3_UPDATE_PAGE |
573 (req->pagemask & PG_HUND ?
574 R3_PAGE_HUNDREDS_DO_CARE :
575 R3_PAGE_HUNDREDS_DO_NOT_CARE),
576
577 COMMAND_END))
578 {
579 return -EIO;
580 }
581
582 t->is_searching[req->pgbuf] = true;
583 return 0;
584 }
585
586 /* This routine decodes the page number from the infobits contained in line 25.
587 *
588 * Parameters:
589 * infobits: must be bits 0 to 9 of column 25
590 *
591 * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
592 */
593 static inline int saa5246a_extract_pagenum_from_infobits(
594 unsigned char infobits[10])
595 {
596 int page_hundreds, page_tens, page_units;
597
598 page_units = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
599 page_tens = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
600 page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
601
602 /* page 0x.. means page 8.. */
603 if (page_hundreds == 0)
604 page_hundreds = 8;
605
606 return((page_hundreds << 8) | (page_tens << 4) | page_units);
607 }
608
609 /* Decodes the hour from the infobits contained in line 25.
610 *
611 * Parameters:
612 * infobits: must be bits 0 to 9 of column 25
613 *
614 * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
615 */
616 static inline int saa5246a_extract_hour_from_infobits(
617 unsigned char infobits[10])
618 {
619 int hour_tens, hour_units;
620
621 hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
622 hour_tens = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
623
624 return((hour_tens << 4) | hour_units);
625 }
626
627 /* Decodes the minutes from the infobits contained in line 25.
628 *
629 * Parameters:
630 * infobits: must be bits 0 to 9 of column 25
631 *
632 * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
633 */
634 static inline int saa5246a_extract_minutes_from_infobits(
635 unsigned char infobits[10])
636 {
637 int minutes_tens, minutes_units;
638
639 minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
640 minutes_tens = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
641
642 return((minutes_tens << 4) | minutes_units);
643 }
644
645 /* Reads the status bits contained in the first 10 columns of the first line
646 * and extracts the information into info.
647 *
648 * Return value: 0 if successful
649 */
650 static inline int saa5246a_get_status(struct saa5246a_device *t,
651 vtx_pageinfo_t *info, unsigned char dau_no)
652 {
653 unsigned char infobits[10];
654 int column;
655
656 if (dau_no >= NUM_DAUS)
657 return -EINVAL;
658
659 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
660
661 dau_no |
662 R8_DO_NOT_CLEAR_MEMORY,
663
664 R9_CURSER_ROW_25,
665
666 R10_CURSER_COLUMN_0,
667
668 COMMAND_END) ||
669 i2c_getdata(t, 10, infobits))
670 {
671 return -EIO;
672 }
673
674 info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
675 info->hour = saa5246a_extract_hour_from_infobits(infobits);
676 info->minute = saa5246a_extract_minutes_from_infobits(infobits);
677 info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
678 info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
679 info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
680 info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
681 info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
682 info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
683 info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
684 info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
685 info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
686 info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
687 info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
688 info->hamming = 0;
689 for (column = 0; column <= 7; column++) {
690 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
691 info->hamming = 1;
692 break;
693 }
694 }
695 if (!info->hamming && !info->notfound)
696 t->is_searching[dau_no] = false;
697 return 0;
698 }
699
700 /* Reads 1 videotext page buffer of the SAA5246A.
701 *
702 * req is used both as input and as output. It contains information which part
703 * must be read. The videotext page is copied into req->buffer.
704 *
705 * Return value: 0 if successful
706 */
707 static inline int saa5246a_get_page(struct saa5246a_device *t,
708 vtx_pagereq_t *req)
709 {
710 int start, end, size;
711 char *buf;
712 int err;
713
714 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
715 req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
716 return -EINVAL;
717
718 buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
719 if (!buf)
720 return -ENOMEM;
721
722 /* Read "normal" part of page */
723 err = -EIO;
724
725 end = min(req->end, VTX_PAGESIZE - 1);
726 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
727 req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
728 ROW(req->start), COLUMN(req->start), COMMAND_END))
729 goto out;
730 if (i2c_getdata(t, end - req->start + 1, buf))
731 goto out;
732 err = -EFAULT;
733 if (copy_to_user(req->buffer, buf, end - req->start + 1))
734 goto out;
735
736 /* Always get the time from buffer 4, since this stupid SAA5246A only
737 * updates the currently displayed buffer...
738 */
739 if (REQ_CONTAINS_TIME(req)) {
740 start = max(req->start, POS_TIME_START);
741 end = min(req->end, POS_TIME_END);
742 size = end - start + 1;
743 err = -EINVAL;
744 if (size < 0)
745 goto out;
746 err = -EIO;
747 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
748 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
749 R9_CURSER_ROW_0, start, COMMAND_END))
750 goto out;
751 if (i2c_getdata(t, size, buf))
752 goto out;
753 err = -EFAULT;
754 if (copy_to_user(req->buffer + start - req->start, buf, size))
755 goto out;
756 }
757 /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
758 if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
759 start = max(req->start, POS_HEADER_START);
760 end = min(req->end, POS_HEADER_END);
761 size = end - start + 1;
762 err = -EINVAL;
763 if (size < 0)
764 goto out;
765 err = -EIO;
766 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
767 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
768 R9_CURSER_ROW_0, start, COMMAND_END))
769 goto out;
770 if (i2c_getdata(t, end - start + 1, buf))
771 goto out;
772 err = -EFAULT;
773 if (copy_to_user(req->buffer + start - req->start, buf, size))
774 goto out;
775 }
776 err = 0;
777 out:
778 kfree(buf);
779 return err;
780 }
781
782 /* Stops the acquisition circuit given in dau_no. The page buffer associated
783 * with this acquisition circuit will no more be updated. The other daus are
784 * not affected.
785 *
786 * Return value: 0 if successful
787 */
788 static inline int saa5246a_stop_dau(struct saa5246a_device *t,
789 unsigned char dau_no)
790 {
791 if (dau_no >= NUM_DAUS)
792 return -EINVAL;
793 if (i2c_senddata(t, SAA5246A_REGISTER_R2,
794
795 R2_IN_R3_SELECT_PAGE_HUNDREDS |
796 dau_no << 4 |
797 R2_BANK_0 |
798 R2_HAMMING_CHECK_OFF,
799
800 R3_PAGE_HUNDREDS_0 |
801 R3_HOLD_PAGE |
802 R3_PAGE_HUNDREDS_DO_NOT_CARE,
803
804 COMMAND_END))
805 {
806 return -EIO;
807 }
808 t->is_searching[dau_no] = false;
809 return 0;
810 }
811
812 /* Handles ioctls defined in videotext.h
813 *
814 * Returns 0 if successful
815 */
816 static long do_saa5246a_ioctl(struct file *file, unsigned int cmd, void *arg)
817 {
818 struct saa5246a_device *t = video_drvdata(file);
819
820 switch(cmd)
821 {
822 case VTXIOCGETINFO:
823 {
824 vtx_info_t *info = arg;
825
826 info->version_major = MAJOR_VERSION;
827 info->version_minor = MINOR_VERSION;
828 info->numpages = NUM_DAUS;
829 return 0;
830 }
831
832 case VTXIOCCLRPAGE:
833 {
834 vtx_pagereq_t *req = arg;
835
836 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
837 return -EINVAL;
838 memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0]));
839 return 0;
840 }
841
842 case VTXIOCCLRFOUND:
843 {
844 vtx_pagereq_t *req = arg;
845
846 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
847 return -EINVAL;
848 return(saa5246a_clear_found_bit(t, req->pgbuf));
849 }
850
851 case VTXIOCPAGEREQ:
852 {
853 vtx_pagereq_t *req = arg;
854
855 return(saa5246a_request_page(t, req));
856 }
857
858 case VTXIOCGETSTAT:
859 {
860 vtx_pagereq_t *req = arg;
861 vtx_pageinfo_t info;
862 int rval;
863
864 if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
865 return rval;
866 if(copy_to_user(req->buffer, &info,
867 sizeof(vtx_pageinfo_t)))
868 return -EFAULT;
869 return 0;
870 }
871
872 case VTXIOCGETPAGE:
873 {
874 vtx_pagereq_t *req = arg;
875
876 return(saa5246a_get_page(t, req));
877 }
878
879 case VTXIOCSTOPDAU:
880 {
881 vtx_pagereq_t *req = arg;
882
883 return(saa5246a_stop_dau(t, req->pgbuf));
884 }
885
886 case VTXIOCPUTPAGE:
887 case VTXIOCSETDISP:
888 case VTXIOCPUTSTAT:
889 return 0;
890
891 case VTXIOCCLRCACHE:
892 {
893 return 0;
894 }
895
896 case VTXIOCSETVIRT:
897 {
898 /* I do not know what "virtual mode" means */
899 return 0;
900 }
901 }
902 return -EINVAL;
903 }
904
905 /*
906 * Translates old vtx IOCTLs to new ones
907 *
908 * This keeps new kernel versions compatible with old userspace programs.
909 */
910 static inline unsigned int vtx_fix_command(unsigned int cmd)
911 {
912 switch (cmd) {
913 case VTXIOCGETINFO_OLD:
914 cmd = VTXIOCGETINFO;
915 break;
916 case VTXIOCCLRPAGE_OLD:
917 cmd = VTXIOCCLRPAGE;
918 break;
919 case VTXIOCCLRFOUND_OLD:
920 cmd = VTXIOCCLRFOUND;
921 break;
922 case VTXIOCPAGEREQ_OLD:
923 cmd = VTXIOCPAGEREQ;
924 break;
925 case VTXIOCGETSTAT_OLD:
926 cmd = VTXIOCGETSTAT;
927 break;
928 case VTXIOCGETPAGE_OLD:
929 cmd = VTXIOCGETPAGE;
930 break;
931 case VTXIOCSTOPDAU_OLD:
932 cmd = VTXIOCSTOPDAU;
933 break;
934 case VTXIOCPUTPAGE_OLD:
935 cmd = VTXIOCPUTPAGE;
936 break;
937 case VTXIOCSETDISP_OLD:
938 cmd = VTXIOCSETDISP;
939 break;
940 case VTXIOCPUTSTAT_OLD:
941 cmd = VTXIOCPUTSTAT;
942 break;
943 case VTXIOCCLRCACHE_OLD:
944 cmd = VTXIOCCLRCACHE;
945 break;
946 case VTXIOCSETVIRT_OLD:
947 cmd = VTXIOCSETVIRT;
948 break;
949 }
950 return cmd;
951 }
952
953 /*
954 * Handle the locking
955 */
956 static long saa5246a_ioctl(struct file *file,
957 unsigned int cmd, unsigned long arg)
958 {
959 struct saa5246a_device *t = video_drvdata(file);
960 long err;
961
962 cmd = vtx_fix_command(cmd);
963 mutex_lock(&t->lock);
964 err = video_usercopy(file, cmd, arg, do_saa5246a_ioctl);
965 mutex_unlock(&t->lock);
966 return err;
967 }
968
969 static int saa5246a_open(struct file *file)
970 {
971 struct saa5246a_device *t = video_drvdata(file);
972
973 if (test_and_set_bit(0, &t->in_use))
974 return -EBUSY;
975
976 if (i2c_senddata(t, SAA5246A_REGISTER_R0,
977 R0_SELECT_R11 |
978 R0_PLL_TIME_CONSTANT_LONG |
979 R0_ENABLE_nODD_EVEN_OUTPUT |
980 R0_ENABLE_HDR_POLL |
981 R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
982 R0_NO_FREE_RUN_PLL |
983 R0_NO_AUTOMATIC_FASTEXT_PROMPT,
984
985 R1_NON_INTERLACED_312_312_LINES |
986 R1_DEW |
987 R1_EXTENDED_PACKET_DISABLE |
988 R1_DAUS_ALL_ON |
989 R1_8_BITS_NO_PARITY |
990 R1_VCS_TO_SCS,
991
992 COMMAND_END) ||
993 i2c_senddata(t, SAA5246A_REGISTER_R4,
994
995 /* We do not care much for the TV display but nevertheless we
996 * need the currently displayed page later because only on that
997 * page the time is updated. */
998 R4_DISPLAY_PAGE_4,
999
1000 COMMAND_END))
1001 {
1002 clear_bit(0, &t->in_use);
1003 return -EIO;
1004 }
1005 return 0;
1006 }
1007
1008 static int saa5246a_release(struct file *file)
1009 {
1010 struct saa5246a_device *t = video_drvdata(file);
1011
1012 /* Stop all acquisition circuits. */
1013 i2c_senddata(t, SAA5246A_REGISTER_R1,
1014
1015 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
1016 R1_DEW |
1017 R1_EXTENDED_PACKET_DISABLE |
1018 R1_DAUS_ALL_OFF |
1019 R1_8_BITS_NO_PARITY |
1020 R1_VCS_TO_SCS,
1021
1022 COMMAND_END);
1023 clear_bit(0, &t->in_use);
1024 return 0;
1025 }
1026
1027 static const struct v4l2_file_operations saa_fops = {
1028 .owner = THIS_MODULE,
1029 .open = saa5246a_open,
1030 .release = saa5246a_release,
1031 .ioctl = saa5246a_ioctl,
1032 };
1033
1034 static struct video_device saa_template =
1035 {
1036 .name = "saa5246a",
1037 .fops = &saa_fops,
1038 .release = video_device_release,
1039 .minor = -1,
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 };
Linux for Ginger Game Console