blob: e20aa3612a7c86699053cdd512be1e286e4b3506 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Driver for the SAA5246A or SAA5281 Teletext (=Videotext) decoder chips from
3 * Philips.
4 *
5 * Only capturing of Teletext pages is tested. The videotext chips also have a
6 * TV output but my hardware doesn't use it. For this reason this driver does
7 * not support changing any TV display settings.
8 *
9 * Copyright (C) 2004 Michael Geng <linux@MichaelGeng.de>
10 *
11 * Derived from
12 *
13 * saa5249 driver
14 * Copyright (C) 1998 Richard Guenther
15 * <richard.guenther@student.uni-tuebingen.de>
16 *
17 * with changes by
18 * Alan Cox <Alan.Cox@linux.org>
19 *
20 * and
21 *
22 * vtx.c
23 * Copyright (C) 1994-97 Martin Buck <martin-2.buck@student.uni-ulm.de>
24 *
25 * This program is free software; you can redistribute it and/or modify
26 * it under the terms of the GNU General Public License as published by
27 * the Free Software Foundation; either version 2 of the License, or
28 * (at your option) any later version.
29 *
30 * This program is distributed in the hope that it will be useful,
31 * but WITHOUT ANY WARRANTY; without even the implied warranty of
32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
33 * GNU General Public License for more details.
34 *
35 * You should have received a copy of the GNU General Public License
36 * along with this program; if not, write to the Free Software
37 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
38 * USA.
39 */
40
41#include <linux/module.h>
42#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/mm.h>
44#include <linux/init.h>
45#include <linux/i2c.h>
46#include <linux/videotext.h>
47#include <linux/videodev.h>
Mauro Carvalho Chehab5e87efa2006-06-05 10:26:32 -030048#include <media/v4l2-common.h>
Ingo Molnar3593cab2006-02-07 06:49:14 -020049#include <linux/mutex.h>
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include "saa5246a.h"
52
53MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
54MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver");
55MODULE_LICENSE("GPL");
56
57struct saa5246a_device
58{
59 u8 pgbuf[NUM_DAUS][VTX_VIRTUALSIZE];
60 int is_searching[NUM_DAUS];
61 struct i2c_client *client;
Ingo Molnar3593cab2006-02-07 06:49:14 -020062 struct mutex lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063};
64
65static struct video_device saa_template; /* Declared near bottom */
66
67/* Addresses to scan */
68static unsigned short normal_i2c[] = { I2C_ADDRESS, I2C_CLIENT_END };
Linus Torvalds1da177e2005-04-16 15:20:36 -070069I2C_CLIENT_INSMOD;
70
71static struct i2c_client client_template;
72
73static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind)
74{
75 int pgbuf;
76 int err;
77 struct i2c_client *client;
78 struct video_device *vd;
79 struct saa5246a_device *t;
80
81 printk(KERN_INFO "saa5246a: teletext chip found.\n");
82 client=kmalloc(sizeof(*client), GFP_KERNEL);
83 if(client==NULL)
84 return -ENOMEM;
85 client_template.adapter = adap;
86 client_template.addr = addr;
87 memcpy(client, &client_template, sizeof(*client));
Panagiotis Issaris74081872006-01-11 19:40:56 -020088 t = kzalloc(sizeof(*t), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 if(t==NULL)
90 {
91 kfree(client);
92 return -ENOMEM;
93 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
Ingo Molnar3593cab2006-02-07 06:49:14 -020095 mutex_init(&t->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97 /*
98 * Now create a video4linux device
99 */
100
101 vd = video_device_alloc();
102 if(vd==NULL)
103 {
104 kfree(t);
105 kfree(client);
106 return -ENOMEM;
107 }
108 i2c_set_clientdata(client, vd);
109 memcpy(vd, &saa_template, sizeof(*vd));
110
111 for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
112 {
113 memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
Richard Knutssone8be02a2007-02-06 21:52:04 -0300114 t->is_searching[pgbuf] = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 }
116 vd->priv=t;
117
118
119 /*
120 * Register it
121 */
122
123 if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
124 {
125 kfree(t);
126 kfree(client);
127 video_device_release(vd);
128 return err;
129 }
130 t->client = client;
131 i2c_attach_client(client);
132 return 0;
133}
134
135/*
136 * We do most of the hard work when we become a device on the i2c.
137 */
138static int saa5246a_probe(struct i2c_adapter *adap)
139{
140 if (adap->class & I2C_CLASS_TV_ANALOG)
141 return i2c_probe(adap, &addr_data, saa5246a_attach);
142 return 0;
143}
144
145static int saa5246a_detach(struct i2c_client *client)
146{
147 struct video_device *vd = i2c_get_clientdata(client);
148 i2c_detach_client(client);
149 video_unregister_device(vd);
150 kfree(vd->priv);
151 kfree(client);
152 return 0;
153}
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155/*
156 * I2C interfaces
157 */
158
159static struct i2c_driver i2c_driver_videotext =
160{
Laurent Riffard604f28e2005-11-26 20:43:39 +0100161 .driver = {
Laurent Riffard604f28e2005-11-26 20:43:39 +0100162 .name = IF_NAME, /* name */
163 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 .id = I2C_DRIVERID_SAA5249, /* in i2c.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 .attach_adapter = saa5246a_probe,
166 .detach_client = saa5246a_detach,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167};
168
169static struct i2c_client client_template = {
170 .driver = &i2c_driver_videotext,
171 .name = "(unset)",
172};
173
174static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
175{
176 char buf[64];
177
178 buf[0] = reg;
179 memcpy(buf+1, data, count);
180
181 if(i2c_master_send(t->client, buf, count+1)==count+1)
182 return 0;
183 return -1;
184}
185
186static int i2c_senddata(struct saa5246a_device *t, ...)
187{
188 unsigned char buf[64];
189 int v;
190 int ct=0;
191 va_list argp;
192 va_start(argp,t);
193
194 while((v=va_arg(argp,int))!=-1)
195 buf[ct++]=v;
196 return i2c_sendbuf(t, buf[0], ct-1, buf+1);
197}
198
199/* Get count number of bytes from I²C-device at address adr, store them in buf.
200 * Start & stop handshaking is done by this routine, ack will be sent after the
Richard Knutssone8be02a2007-02-06 21:52:04 -0300201 * last byte to inhibit further sending of data. If uaccess is 'true', data is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 * written to user-space with put_user. Returns -1 if I²C-device didn't send
203 * acknowledge, 0 otherwise
204 */
205static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf)
206{
207 if(i2c_master_recv(t->client, buf, count)!=count)
208 return -1;
209 return 0;
210}
211
212/* When a page is found then the not FOUND bit in one of the status registers
213 * of the SAA5264A chip is cleared. Unfortunately this bit is not set
214 * automatically when a new page is requested. Instead this function must be
215 * called after a page has been requested.
216 *
217 * Return value: 0 if successful
218 */
219static int saa5246a_clear_found_bit(struct saa5246a_device *t,
220 unsigned char dau_no)
221{
222 unsigned char row_25_column_8;
223
224 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
225
226 dau_no |
227 R8_DO_NOT_CLEAR_MEMORY,
228
229 R9_CURSER_ROW_25,
230
231 R10_CURSER_COLUMN_8,
232
233 COMMAND_END) ||
234 i2c_getdata(t, 1, &row_25_column_8))
235 {
236 return -EIO;
237 }
238 row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND;
239 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
240
241 dau_no |
242 R8_DO_NOT_CLEAR_MEMORY,
243
244 R9_CURSER_ROW_25,
245
246 R10_CURSER_COLUMN_8,
247
248 row_25_column_8,
249
250 COMMAND_END))
251 {
252 return -EIO;
253 }
254
255 return 0;
256}
257
258/* Requests one videotext page as described in req. The fields of req are
259 * checked and an error is returned if something is invalid.
260 *
261 * Return value: 0 if successful
262 */
263static int saa5246a_request_page(struct saa5246a_device *t,
264 vtx_pagereq_t *req)
265{
266 if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX)
267 return -EINVAL;
268 if (req->pagemask & PGMASK_PAGE)
269 if (req->page < 0 || req->page > PAGE_MAX)
270 return -EINVAL;
271 if (req->pagemask & PGMASK_HOUR)
272 if (req->hour < 0 || req->hour > HOUR_MAX)
273 return -EINVAL;
274 if (req->pagemask & PGMASK_MINUTE)
275 if (req->minute < 0 || req->minute > MINUTE_MAX)
276 return -EINVAL;
277 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
278 return -EINVAL;
279
280 if (i2c_senddata(t, SAA5246A_REGISTER_R2,
281
282 R2_IN_R3_SELECT_PAGE_HUNDREDS |
283 req->pgbuf << 4 |
284 R2_BANK_0 |
285 R2_HAMMING_CHECK_OFF,
286
287 HUNDREDS_OF_PAGE(req->page) |
288 R3_HOLD_PAGE |
289 (req->pagemask & PG_HUND ?
290 R3_PAGE_HUNDREDS_DO_CARE :
291 R3_PAGE_HUNDREDS_DO_NOT_CARE),
292
293 TENS_OF_PAGE(req->page) |
294 (req->pagemask & PG_TEN ?
295 R3_PAGE_TENS_DO_CARE :
296 R3_PAGE_TENS_DO_NOT_CARE),
297
298 UNITS_OF_PAGE(req->page) |
299 (req->pagemask & PG_UNIT ?
300 R3_PAGE_UNITS_DO_CARE :
301 R3_PAGE_UNITS_DO_NOT_CARE),
302
303 TENS_OF_HOUR(req->hour) |
304 (req->pagemask & HR_TEN ?
305 R3_HOURS_TENS_DO_CARE :
306 R3_HOURS_TENS_DO_NOT_CARE),
307
308 UNITS_OF_HOUR(req->hour) |
309 (req->pagemask & HR_UNIT ?
310 R3_HOURS_UNITS_DO_CARE :
311 R3_HOURS_UNITS_DO_NOT_CARE),
312
313 TENS_OF_MINUTE(req->minute) |
314 (req->pagemask & MIN_TEN ?
315 R3_MINUTES_TENS_DO_CARE :
316 R3_MINUTES_TENS_DO_NOT_CARE),
317
318 UNITS_OF_MINUTE(req->minute) |
319 (req->pagemask & MIN_UNIT ?
320 R3_MINUTES_UNITS_DO_CARE :
321 R3_MINUTES_UNITS_DO_NOT_CARE),
322
323 COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2,
324
325 R2_IN_R3_SELECT_PAGE_HUNDREDS |
326 req->pgbuf << 4 |
327 R2_BANK_0 |
328 R2_HAMMING_CHECK_OFF,
329
330 HUNDREDS_OF_PAGE(req->page) |
331 R3_UPDATE_PAGE |
332 (req->pagemask & PG_HUND ?
333 R3_PAGE_HUNDREDS_DO_CARE :
334 R3_PAGE_HUNDREDS_DO_NOT_CARE),
335
336 COMMAND_END))
337 {
338 return -EIO;
339 }
340
Richard Knutssone8be02a2007-02-06 21:52:04 -0300341 t->is_searching[req->pgbuf] = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 return 0;
343}
344
345/* This routine decodes the page number from the infobits contained in line 25.
346 *
347 * Parameters:
348 * infobits: must be bits 0 to 9 of column 25
349 *
350 * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123
351 */
352static inline int saa5246a_extract_pagenum_from_infobits(
353 unsigned char infobits[10])
354{
355 int page_hundreds, page_tens, page_units;
356
357 page_units = infobits[0] & ROW25_COLUMN0_PAGE_UNITS;
358 page_tens = infobits[1] & ROW25_COLUMN1_PAGE_TENS;
359 page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS;
360
361 /* page 0x.. means page 8.. */
362 if (page_hundreds == 0)
363 page_hundreds = 8;
364
365 return((page_hundreds << 8) | (page_tens << 4) | page_units);
366}
367
368/* Decodes the hour from the infobits contained in line 25.
369 *
370 * Parameters:
371 * infobits: must be bits 0 to 9 of column 25
372 *
373 * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12
374 */
375static inline int saa5246a_extract_hour_from_infobits(
376 unsigned char infobits[10])
377{
378 int hour_tens, hour_units;
379
380 hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS;
381 hour_tens = infobits[5] & ROW25_COLUMN5_HOUR_TENS;
382
383 return((hour_tens << 4) | hour_units);
384}
385
386/* Decodes the minutes from the infobits contained in line 25.
387 *
388 * Parameters:
389 * infobits: must be bits 0 to 9 of column 25
390 *
391 * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10
392 */
393static inline int saa5246a_extract_minutes_from_infobits(
394 unsigned char infobits[10])
395{
396 int minutes_tens, minutes_units;
397
398 minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS;
399 minutes_tens = infobits[3] & ROW25_COLUMN3_MINUTES_TENS;
400
401 return((minutes_tens << 4) | minutes_units);
402}
403
404/* Reads the status bits contained in the first 10 columns of the first line
405 * and extracts the information into info.
406 *
407 * Return value: 0 if successful
408 */
409static inline int saa5246a_get_status(struct saa5246a_device *t,
410 vtx_pageinfo_t *info, unsigned char dau_no)
411{
412 unsigned char infobits[10];
413 int column;
414
415 if (dau_no >= NUM_DAUS)
416 return -EINVAL;
417
418 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
419
420 dau_no |
421 R8_DO_NOT_CLEAR_MEMORY,
422
423 R9_CURSER_ROW_25,
424
425 R10_CURSER_COLUMN_0,
426
427 COMMAND_END) ||
428 i2c_getdata(t, 10, infobits))
429 {
430 return -EIO;
431 }
432
433 info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits);
434 info->hour = saa5246a_extract_hour_from_infobits(infobits);
435 info->minute = saa5246a_extract_minutes_from_infobits(infobits);
436 info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1);
437 info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE);
438 info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE);
439 info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE);
440 info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER);
441 info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE);
442 info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE);
443 info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY);
444 info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE);
445 info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND);
446 info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR);
447 info->hamming = 0;
448 for (column = 0; column <= 7; column++) {
449 if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) {
450 info->hamming = 1;
451 break;
452 }
453 }
454 if (!info->hamming && !info->notfound)
Richard Knutssone8be02a2007-02-06 21:52:04 -0300455 t->is_searching[dau_no] = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 return 0;
457}
458
459/* Reads 1 videotext page buffer of the SAA5246A.
460 *
461 * req is used both as input and as output. It contains information which part
462 * must be read. The videotext page is copied into req->buffer.
463 *
464 * Return value: 0 if successful
465 */
466static inline int saa5246a_get_page(struct saa5246a_device *t,
467 vtx_pagereq_t *req)
468{
469 int start, end, size;
470 char *buf;
471 int err;
472
473 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS ||
474 req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE)
475 return -EINVAL;
476
477 buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
478 if (!buf)
479 return -ENOMEM;
480
481 /* Read "normal" part of page */
482 err = -EIO;
483
484 end = min(req->end, VTX_PAGESIZE - 1);
485 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
486 req->pgbuf | R8_DO_NOT_CLEAR_MEMORY,
487 ROW(req->start), COLUMN(req->start), COMMAND_END))
488 goto out;
489 if (i2c_getdata(t, end - req->start + 1, buf))
490 goto out;
491 err = -EFAULT;
492 if (copy_to_user(req->buffer, buf, end - req->start + 1))
493 goto out;
494
495 /* Always get the time from buffer 4, since this stupid SAA5246A only
496 * updates the currently displayed buffer...
497 */
498 if (REQ_CONTAINS_TIME(req)) {
499 start = max(req->start, POS_TIME_START);
500 end = min(req->end, POS_TIME_END);
501 size = end - start + 1;
502 err = -EINVAL;
503 if (size < 0)
504 goto out;
505 err = -EIO;
506 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
507 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
508 R9_CURSER_ROW_0, start, COMMAND_END))
509 goto out;
510 if (i2c_getdata(t, size, buf))
511 goto out;
512 err = -EFAULT;
513 if (copy_to_user(req->buffer + start - req->start, buf, size))
514 goto out;
515 }
516 /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */
517 if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) {
518 start = max(req->start, POS_HEADER_START);
519 end = min(req->end, POS_HEADER_END);
520 size = end - start + 1;
521 err = -EINVAL;
522 if (size < 0)
523 goto out;
524 err = -EIO;
525 if (i2c_senddata(t, SAA5246A_REGISTER_R8,
526 R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY,
527 R9_CURSER_ROW_0, start, COMMAND_END))
528 goto out;
529 if (i2c_getdata(t, end - start + 1, buf))
530 goto out;
531 err = -EFAULT;
532 if (copy_to_user(req->buffer + start - req->start, buf, size))
533 goto out;
534 }
535 err = 0;
536out:
537 kfree(buf);
538 return err;
539}
540
541/* Stops the acquisition circuit given in dau_no. The page buffer associated
542 * with this acquisition circuit will no more be updated. The other daus are
543 * not affected.
544 *
545 * Return value: 0 if successful
546 */
547static inline int saa5246a_stop_dau(struct saa5246a_device *t,
548 unsigned char dau_no)
549{
550 if (dau_no >= NUM_DAUS)
551 return -EINVAL;
552 if (i2c_senddata(t, SAA5246A_REGISTER_R2,
553
554 R2_IN_R3_SELECT_PAGE_HUNDREDS |
555 dau_no << 4 |
556 R2_BANK_0 |
557 R2_HAMMING_CHECK_OFF,
558
559 R3_PAGE_HUNDREDS_0 |
560 R3_HOLD_PAGE |
561 R3_PAGE_HUNDREDS_DO_NOT_CARE,
562
563 COMMAND_END))
564 {
565 return -EIO;
566 }
Richard Knutssone8be02a2007-02-06 21:52:04 -0300567 t->is_searching[dau_no] = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 return 0;
569}
570
571/* Handles ioctls defined in videotext.h
572 *
573 * Returns 0 if successful
574 */
575static int do_saa5246a_ioctl(struct inode *inode, struct file *file,
576 unsigned int cmd, void *arg)
577{
578 struct video_device *vd = video_devdata(file);
579 struct saa5246a_device *t=vd->priv;
580 switch(cmd)
581 {
582 case VTXIOCGETINFO:
583 {
584 vtx_info_t *info = arg;
585
586 info->version_major = MAJOR_VERSION;
587 info->version_minor = MINOR_VERSION;
588 info->numpages = NUM_DAUS;
589 return 0;
590 }
591
592 case VTXIOCCLRPAGE:
593 {
594 vtx_pagereq_t *req = arg;
595
596 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
597 return -EINVAL;
598 memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0]));
599 return 0;
600 }
601
602 case VTXIOCCLRFOUND:
603 {
604 vtx_pagereq_t *req = arg;
605
606 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
607 return -EINVAL;
608 return(saa5246a_clear_found_bit(t, req->pgbuf));
609 }
610
611 case VTXIOCPAGEREQ:
612 {
613 vtx_pagereq_t *req = arg;
614
615 return(saa5246a_request_page(t, req));
616 }
617
618 case VTXIOCGETSTAT:
619 {
620 vtx_pagereq_t *req = arg;
621 vtx_pageinfo_t info;
622 int rval;
623
624 if ((rval = saa5246a_get_status(t, &info, req->pgbuf)))
625 return rval;
626 if(copy_to_user(req->buffer, &info,
627 sizeof(vtx_pageinfo_t)))
628 return -EFAULT;
629 return 0;
630 }
631
632 case VTXIOCGETPAGE:
633 {
634 vtx_pagereq_t *req = arg;
635
636 return(saa5246a_get_page(t, req));
637 }
638
639 case VTXIOCSTOPDAU:
640 {
641 vtx_pagereq_t *req = arg;
642
643 return(saa5246a_stop_dau(t, req->pgbuf));
644 }
645
646 case VTXIOCPUTPAGE:
647 case VTXIOCSETDISP:
648 case VTXIOCPUTSTAT:
649 return 0;
650
651 case VTXIOCCLRCACHE:
652 {
653 return 0;
654 }
655
656 case VTXIOCSETVIRT:
657 {
658 /* I do not know what "virtual mode" means */
659 return 0;
660 }
661 }
662 return -EINVAL;
663}
664
665/*
666 * Translates old vtx IOCTLs to new ones
667 *
668 * This keeps new kernel versions compatible with old userspace programs.
669 */
670static inline unsigned int vtx_fix_command(unsigned int cmd)
671{
672 switch (cmd) {
673 case VTXIOCGETINFO_OLD:
674 cmd = VTXIOCGETINFO;
675 break;
676 case VTXIOCCLRPAGE_OLD:
677 cmd = VTXIOCCLRPAGE;
678 break;
679 case VTXIOCCLRFOUND_OLD:
680 cmd = VTXIOCCLRFOUND;
681 break;
682 case VTXIOCPAGEREQ_OLD:
683 cmd = VTXIOCPAGEREQ;
684 break;
685 case VTXIOCGETSTAT_OLD:
686 cmd = VTXIOCGETSTAT;
687 break;
688 case VTXIOCGETPAGE_OLD:
689 cmd = VTXIOCGETPAGE;
690 break;
691 case VTXIOCSTOPDAU_OLD:
692 cmd = VTXIOCSTOPDAU;
693 break;
694 case VTXIOCPUTPAGE_OLD:
695 cmd = VTXIOCPUTPAGE;
696 break;
697 case VTXIOCSETDISP_OLD:
698 cmd = VTXIOCSETDISP;
699 break;
700 case VTXIOCPUTSTAT_OLD:
701 cmd = VTXIOCPUTSTAT;
702 break;
703 case VTXIOCCLRCACHE_OLD:
704 cmd = VTXIOCCLRCACHE;
705 break;
706 case VTXIOCSETVIRT_OLD:
707 cmd = VTXIOCSETVIRT;
708 break;
709 }
710 return cmd;
711}
712
713/*
714 * Handle the locking
715 */
716static int saa5246a_ioctl(struct inode *inode, struct file *file,
717 unsigned int cmd, unsigned long arg)
718{
719 struct video_device *vd = video_devdata(file);
720 struct saa5246a_device *t = vd->priv;
721 int err;
722
723 cmd = vtx_fix_command(cmd);
Ingo Molnar3593cab2006-02-07 06:49:14 -0200724 mutex_lock(&t->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
Ingo Molnar3593cab2006-02-07 06:49:14 -0200726 mutex_unlock(&t->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 return err;
728}
729
730static int saa5246a_open(struct inode *inode, struct file *file)
731{
732 struct video_device *vd = video_devdata(file);
733 struct saa5246a_device *t = vd->priv;
734 int err;
735
736 err = video_exclusive_open(inode,file);
737 if (err < 0)
738 return err;
739
740 if (t->client==NULL) {
741 err = -ENODEV;
742 goto fail;
743 }
744
745 if (i2c_senddata(t, SAA5246A_REGISTER_R0,
746
747 R0_SELECT_R11 |
748 R0_PLL_TIME_CONSTANT_LONG |
749 R0_ENABLE_nODD_EVEN_OUTPUT |
750 R0_ENABLE_HDR_POLL |
751 R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED |
752 R0_NO_FREE_RUN_PLL |
753 R0_NO_AUTOMATIC_FASTEXT_PROMPT,
754
755 R1_NON_INTERLACED_312_312_LINES |
756 R1_DEW |
757 R1_EXTENDED_PACKET_DISABLE |
758 R1_DAUS_ALL_ON |
759 R1_8_BITS_NO_PARITY |
760 R1_VCS_TO_SCS,
761
762 COMMAND_END) ||
763 i2c_senddata(t, SAA5246A_REGISTER_R4,
764
765 /* We do not care much for the TV display but nevertheless we
766 * need the currently displayed page later because only on that
767 * page the time is updated. */
768 R4_DISPLAY_PAGE_4,
769
770 COMMAND_END))
771 {
772 err = -EIO;
773 goto fail;
774 }
775
776 return 0;
777
778fail:
779 video_exclusive_release(inode,file);
780 return err;
781}
782
783static int saa5246a_release(struct inode *inode, struct file *file)
784{
785 struct video_device *vd = video_devdata(file);
786 struct saa5246a_device *t = vd->priv;
787
788 /* Stop all acquisition circuits. */
789 i2c_senddata(t, SAA5246A_REGISTER_R1,
790
791 R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES |
792 R1_DEW |
793 R1_EXTENDED_PACKET_DISABLE |
794 R1_DAUS_ALL_OFF |
795 R1_8_BITS_NO_PARITY |
796 R1_VCS_TO_SCS,
797
798 COMMAND_END);
799 video_exclusive_release(inode,file);
800 return 0;
801}
802
803static int __init init_saa_5246a (void)
804{
805 printk(KERN_INFO
806 "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
807 MAJOR_VERSION, MINOR_VERSION);
808 return i2c_add_driver(&i2c_driver_videotext);
809}
810
811static void __exit cleanup_saa_5246a (void)
812{
813 i2c_del_driver(&i2c_driver_videotext);
814}
815
816module_init(init_saa_5246a);
817module_exit(cleanup_saa_5246a);
818
Arjan van de Venfa027c22007-02-12 00:55:33 -0800819static const struct file_operations saa_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 .owner = THIS_MODULE,
821 .open = saa5246a_open,
822 .release = saa5246a_release,
823 .ioctl = saa5246a_ioctl,
824 .llseek = no_llseek,
825};
826
827static struct video_device saa_template =
828{
829 .owner = THIS_MODULE,
830 .name = IF_NAME,
831 .type = VID_TYPE_TELETEXT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 .fops = &saa_fops,
833 .release = video_device_release,
834 .minor = -1,
835};