Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Driver for the SAA5246A or SAA5281 Teletext (=Videotext) decoder chips from | |
3 | * Philips. | |
4 | * | |
5 | * Only capturing of Teletext pages is tested. The videotext chips also have a | |
6 | * TV output but my hardware doesn't use it. For this reason this driver does | |
7 | * not support changing any TV display settings. | |
8 | * | |
9 | * Copyright (C) 2004 Michael Geng <linux@MichaelGeng.de> | |
10 | * | |
11 | * Derived from | |
12 | * | |
13 | * saa5249 driver | |
14 | * Copyright (C) 1998 Richard Guenther | |
15 | * <richard.guenther@student.uni-tuebingen.de> | |
16 | * | |
17 | * with changes by | |
18 | * Alan Cox <Alan.Cox@linux.org> | |
19 | * | |
20 | * and | |
21 | * | |
22 | * vtx.c | |
23 | * Copyright (C) 1994-97 Martin Buck <martin-2.buck@student.uni-ulm.de> | |
24 | * | |
25 | * This program is free software; you can redistribute it and/or modify | |
26 | * it under the terms of the GNU General Public License as published by | |
27 | * the Free Software Foundation; either version 2 of the License, or | |
28 | * (at your option) any later version. | |
29 | * | |
30 | * This program is distributed in the hope that it will be useful, | |
31 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
32 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
33 | * GNU General Public License for more details. | |
34 | * | |
35 | * You should have received a copy of the GNU General Public License | |
36 | * along with this program; if not, write to the Free Software | |
37 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
38 | * USA. | |
39 | */ | |
40 | ||
41 | #include <linux/module.h> | |
42 | #include <linux/kernel.h> | |
1da177e4 LT |
43 | #include <linux/mm.h> |
44 | #include <linux/init.h> | |
45 | #include <linux/i2c.h> | |
46 | #include <linux/videotext.h> | |
47 | #include <linux/videodev.h> | |
5e87efa3 | 48 | #include <media/v4l2-common.h> |
3593cab5 IM |
49 | #include <linux/mutex.h> |
50 | ||
1da177e4 LT |
51 | #include "saa5246a.h" |
52 | ||
53 | MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>"); | |
54 | MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver"); | |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
57 | struct saa5246a_device | |
58 | { | |
59 | u8 pgbuf[NUM_DAUS][VTX_VIRTUALSIZE]; | |
60 | int is_searching[NUM_DAUS]; | |
61 | struct i2c_client *client; | |
3593cab5 | 62 | struct mutex lock; |
1da177e4 LT |
63 | }; |
64 | ||
65 | static struct video_device saa_template; /* Declared near bottom */ | |
66 | ||
67 | /* Addresses to scan */ | |
68 | static unsigned short normal_i2c[] = { I2C_ADDRESS, I2C_CLIENT_END }; | |
1da177e4 LT |
69 | I2C_CLIENT_INSMOD; |
70 | ||
71 | static struct i2c_client client_template; | |
72 | ||
73 | static 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)); | |
7408187d | 88 | t = kzalloc(sizeof(*t), GFP_KERNEL); |
1da177e4 LT |
89 | if(t==NULL) |
90 | { | |
91 | kfree(client); | |
92 | return -ENOMEM; | |
93 | } | |
1da177e4 | 94 | strlcpy(client->name, IF_NAME, I2C_NAME_SIZE); |
3593cab5 | 95 | mutex_init(&t->lock); |
1da177e4 LT |
96 | |
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])); | |
e8be02a3 | 114 | t->is_searching[pgbuf] = false; |
1da177e4 LT |
115 | } |
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 | */ | |
138 | static 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 | ||
145 | static 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 | ||
1da177e4 LT |
155 | /* |
156 | * I2C interfaces | |
157 | */ | |
158 | ||
159 | static struct i2c_driver i2c_driver_videotext = | |
160 | { | |
604f28e2 | 161 | .driver = { |
604f28e2 LR |
162 | .name = IF_NAME, /* name */ |
163 | }, | |
1da177e4 | 164 | .id = I2C_DRIVERID_SAA5249, /* in i2c.h */ |
1da177e4 LT |
165 | .attach_adapter = saa5246a_probe, |
166 | .detach_client = saa5246a_detach, | |
1da177e4 LT |
167 | }; |
168 | ||
169 | static struct i2c_client client_template = { | |
170 | .driver = &i2c_driver_videotext, | |
171 | .name = "(unset)", | |
172 | }; | |
173 | ||
174 | static 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 | ||
186 | static int i2c_senddata(struct saa5246a_device *t, ...) | |
187 | { | |
188 | unsigned char buf[64]; | |
189 | int v; | |
b730a81c | 190 | int ct = 0; |
1da177e4 | 191 | va_list argp; |
b730a81c | 192 | va_start(argp, t); |
1da177e4 | 193 | |
b730a81c RK |
194 | while ((v = va_arg(argp, int)) != -1) |
195 | buf[ct++] = v; | |
196 | ||
197 | va_end(argp); | |
1da177e4 LT |
198 | return i2c_sendbuf(t, buf[0], ct-1, buf+1); |
199 | } | |
200 | ||
db955170 | 201 | /* Get count number of bytes from I²C-device at address adr, store them in buf. |
1da177e4 | 202 | * Start & stop handshaking is done by this routine, ack will be sent after the |
e8be02a3 | 203 | * last byte to inhibit further sending of data. If uaccess is 'true', data is |
db955170 | 204 | * written to user-space with put_user. Returns -1 if I²C-device didn't send |
1da177e4 LT |
205 | * acknowledge, 0 otherwise |
206 | */ | |
207 | static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf) | |
208 | { | |
209 | if(i2c_master_recv(t->client, buf, count)!=count) | |
210 | return -1; | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /* When a page is found then the not FOUND bit in one of the status registers | |
215 | * of the SAA5264A chip is cleared. Unfortunately this bit is not set | |
216 | * automatically when a new page is requested. Instead this function must be | |
217 | * called after a page has been requested. | |
218 | * | |
219 | * Return value: 0 if successful | |
220 | */ | |
221 | static int saa5246a_clear_found_bit(struct saa5246a_device *t, | |
222 | unsigned char dau_no) | |
223 | { | |
224 | unsigned char row_25_column_8; | |
225 | ||
226 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, | |
227 | ||
228 | dau_no | | |
229 | R8_DO_NOT_CLEAR_MEMORY, | |
230 | ||
231 | R9_CURSER_ROW_25, | |
232 | ||
233 | R10_CURSER_COLUMN_8, | |
234 | ||
235 | COMMAND_END) || | |
236 | i2c_getdata(t, 1, &row_25_column_8)) | |
237 | { | |
238 | return -EIO; | |
239 | } | |
240 | row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND; | |
241 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, | |
242 | ||
243 | dau_no | | |
244 | R8_DO_NOT_CLEAR_MEMORY, | |
245 | ||
246 | R9_CURSER_ROW_25, | |
247 | ||
248 | R10_CURSER_COLUMN_8, | |
249 | ||
250 | row_25_column_8, | |
251 | ||
252 | COMMAND_END)) | |
253 | { | |
254 | return -EIO; | |
255 | } | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | /* Requests one videotext page as described in req. The fields of req are | |
261 | * checked and an error is returned if something is invalid. | |
262 | * | |
263 | * Return value: 0 if successful | |
264 | */ | |
265 | static int saa5246a_request_page(struct saa5246a_device *t, | |
266 | vtx_pagereq_t *req) | |
267 | { | |
268 | if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX) | |
269 | return -EINVAL; | |
270 | if (req->pagemask & PGMASK_PAGE) | |
271 | if (req->page < 0 || req->page > PAGE_MAX) | |
272 | return -EINVAL; | |
273 | if (req->pagemask & PGMASK_HOUR) | |
274 | if (req->hour < 0 || req->hour > HOUR_MAX) | |
275 | return -EINVAL; | |
276 | if (req->pagemask & PGMASK_MINUTE) | |
277 | if (req->minute < 0 || req->minute > MINUTE_MAX) | |
278 | return -EINVAL; | |
279 | if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS) | |
280 | return -EINVAL; | |
281 | ||
282 | if (i2c_senddata(t, SAA5246A_REGISTER_R2, | |
283 | ||
284 | R2_IN_R3_SELECT_PAGE_HUNDREDS | | |
285 | req->pgbuf << 4 | | |
286 | R2_BANK_0 | | |
287 | R2_HAMMING_CHECK_OFF, | |
288 | ||
289 | HUNDREDS_OF_PAGE(req->page) | | |
290 | R3_HOLD_PAGE | | |
291 | (req->pagemask & PG_HUND ? | |
292 | R3_PAGE_HUNDREDS_DO_CARE : | |
293 | R3_PAGE_HUNDREDS_DO_NOT_CARE), | |
294 | ||
295 | TENS_OF_PAGE(req->page) | | |
296 | (req->pagemask & PG_TEN ? | |
297 | R3_PAGE_TENS_DO_CARE : | |
298 | R3_PAGE_TENS_DO_NOT_CARE), | |
299 | ||
300 | UNITS_OF_PAGE(req->page) | | |
301 | (req->pagemask & PG_UNIT ? | |
302 | R3_PAGE_UNITS_DO_CARE : | |
303 | R3_PAGE_UNITS_DO_NOT_CARE), | |
304 | ||
305 | TENS_OF_HOUR(req->hour) | | |
306 | (req->pagemask & HR_TEN ? | |
307 | R3_HOURS_TENS_DO_CARE : | |
308 | R3_HOURS_TENS_DO_NOT_CARE), | |
309 | ||
310 | UNITS_OF_HOUR(req->hour) | | |
311 | (req->pagemask & HR_UNIT ? | |
312 | R3_HOURS_UNITS_DO_CARE : | |
313 | R3_HOURS_UNITS_DO_NOT_CARE), | |
314 | ||
315 | TENS_OF_MINUTE(req->minute) | | |
316 | (req->pagemask & MIN_TEN ? | |
317 | R3_MINUTES_TENS_DO_CARE : | |
318 | R3_MINUTES_TENS_DO_NOT_CARE), | |
319 | ||
320 | UNITS_OF_MINUTE(req->minute) | | |
321 | (req->pagemask & MIN_UNIT ? | |
322 | R3_MINUTES_UNITS_DO_CARE : | |
323 | R3_MINUTES_UNITS_DO_NOT_CARE), | |
324 | ||
325 | COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2, | |
326 | ||
327 | R2_IN_R3_SELECT_PAGE_HUNDREDS | | |
328 | req->pgbuf << 4 | | |
329 | R2_BANK_0 | | |
330 | R2_HAMMING_CHECK_OFF, | |
331 | ||
332 | HUNDREDS_OF_PAGE(req->page) | | |
333 | R3_UPDATE_PAGE | | |
334 | (req->pagemask & PG_HUND ? | |
335 | R3_PAGE_HUNDREDS_DO_CARE : | |
336 | R3_PAGE_HUNDREDS_DO_NOT_CARE), | |
337 | ||
338 | COMMAND_END)) | |
339 | { | |
340 | return -EIO; | |
341 | } | |
342 | ||
e8be02a3 | 343 | t->is_searching[req->pgbuf] = true; |
1da177e4 LT |
344 | return 0; |
345 | } | |
346 | ||
347 | /* This routine decodes the page number from the infobits contained in line 25. | |
348 | * | |
349 | * Parameters: | |
350 | * infobits: must be bits 0 to 9 of column 25 | |
351 | * | |
352 | * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123 | |
353 | */ | |
354 | static inline int saa5246a_extract_pagenum_from_infobits( | |
355 | unsigned char infobits[10]) | |
356 | { | |
357 | int page_hundreds, page_tens, page_units; | |
358 | ||
359 | page_units = infobits[0] & ROW25_COLUMN0_PAGE_UNITS; | |
360 | page_tens = infobits[1] & ROW25_COLUMN1_PAGE_TENS; | |
361 | page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS; | |
362 | ||
363 | /* page 0x.. means page 8.. */ | |
364 | if (page_hundreds == 0) | |
365 | page_hundreds = 8; | |
366 | ||
367 | return((page_hundreds << 8) | (page_tens << 4) | page_units); | |
368 | } | |
369 | ||
370 | /* Decodes the hour from the infobits contained in line 25. | |
371 | * | |
372 | * Parameters: | |
373 | * infobits: must be bits 0 to 9 of column 25 | |
374 | * | |
375 | * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12 | |
376 | */ | |
377 | static inline int saa5246a_extract_hour_from_infobits( | |
378 | unsigned char infobits[10]) | |
379 | { | |
380 | int hour_tens, hour_units; | |
381 | ||
382 | hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS; | |
383 | hour_tens = infobits[5] & ROW25_COLUMN5_HOUR_TENS; | |
384 | ||
385 | return((hour_tens << 4) | hour_units); | |
386 | } | |
387 | ||
388 | /* Decodes the minutes from the infobits contained in line 25. | |
389 | * | |
390 | * Parameters: | |
391 | * infobits: must be bits 0 to 9 of column 25 | |
392 | * | |
393 | * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10 | |
394 | */ | |
395 | static inline int saa5246a_extract_minutes_from_infobits( | |
396 | unsigned char infobits[10]) | |
397 | { | |
398 | int minutes_tens, minutes_units; | |
399 | ||
400 | minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS; | |
401 | minutes_tens = infobits[3] & ROW25_COLUMN3_MINUTES_TENS; | |
402 | ||
403 | return((minutes_tens << 4) | minutes_units); | |
404 | } | |
405 | ||
406 | /* Reads the status bits contained in the first 10 columns of the first line | |
407 | * and extracts the information into info. | |
408 | * | |
409 | * Return value: 0 if successful | |
410 | */ | |
411 | static inline int saa5246a_get_status(struct saa5246a_device *t, | |
412 | vtx_pageinfo_t *info, unsigned char dau_no) | |
413 | { | |
414 | unsigned char infobits[10]; | |
415 | int column; | |
416 | ||
417 | if (dau_no >= NUM_DAUS) | |
418 | return -EINVAL; | |
419 | ||
420 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, | |
421 | ||
422 | dau_no | | |
423 | R8_DO_NOT_CLEAR_MEMORY, | |
424 | ||
425 | R9_CURSER_ROW_25, | |
426 | ||
427 | R10_CURSER_COLUMN_0, | |
428 | ||
429 | COMMAND_END) || | |
430 | i2c_getdata(t, 10, infobits)) | |
431 | { | |
432 | return -EIO; | |
433 | } | |
434 | ||
435 | info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits); | |
436 | info->hour = saa5246a_extract_hour_from_infobits(infobits); | |
437 | info->minute = saa5246a_extract_minutes_from_infobits(infobits); | |
438 | info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1); | |
439 | info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE); | |
440 | info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE); | |
441 | info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE); | |
442 | info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER); | |
443 | info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE); | |
444 | info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE); | |
445 | info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY); | |
446 | info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE); | |
447 | info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND); | |
448 | info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR); | |
449 | info->hamming = 0; | |
450 | for (column = 0; column <= 7; column++) { | |
451 | if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) { | |
452 | info->hamming = 1; | |
453 | break; | |
454 | } | |
455 | } | |
456 | if (!info->hamming && !info->notfound) | |
e8be02a3 | 457 | t->is_searching[dau_no] = false; |
1da177e4 LT |
458 | return 0; |
459 | } | |
460 | ||
461 | /* Reads 1 videotext page buffer of the SAA5246A. | |
462 | * | |
463 | * req is used both as input and as output. It contains information which part | |
464 | * must be read. The videotext page is copied into req->buffer. | |
465 | * | |
466 | * Return value: 0 if successful | |
467 | */ | |
468 | static inline int saa5246a_get_page(struct saa5246a_device *t, | |
469 | vtx_pagereq_t *req) | |
470 | { | |
471 | int start, end, size; | |
472 | char *buf; | |
473 | int err; | |
474 | ||
475 | if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || | |
476 | req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE) | |
477 | return -EINVAL; | |
478 | ||
479 | buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL); | |
480 | if (!buf) | |
481 | return -ENOMEM; | |
482 | ||
483 | /* Read "normal" part of page */ | |
484 | err = -EIO; | |
485 | ||
486 | end = min(req->end, VTX_PAGESIZE - 1); | |
487 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, | |
488 | req->pgbuf | R8_DO_NOT_CLEAR_MEMORY, | |
489 | ROW(req->start), COLUMN(req->start), COMMAND_END)) | |
490 | goto out; | |
491 | if (i2c_getdata(t, end - req->start + 1, buf)) | |
492 | goto out; | |
493 | err = -EFAULT; | |
494 | if (copy_to_user(req->buffer, buf, end - req->start + 1)) | |
495 | goto out; | |
496 | ||
497 | /* Always get the time from buffer 4, since this stupid SAA5246A only | |
498 | * updates the currently displayed buffer... | |
499 | */ | |
500 | if (REQ_CONTAINS_TIME(req)) { | |
501 | start = max(req->start, POS_TIME_START); | |
502 | end = min(req->end, POS_TIME_END); | |
503 | size = end - start + 1; | |
504 | err = -EINVAL; | |
505 | if (size < 0) | |
506 | goto out; | |
507 | err = -EIO; | |
508 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, | |
509 | R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY, | |
510 | R9_CURSER_ROW_0, start, COMMAND_END)) | |
511 | goto out; | |
512 | if (i2c_getdata(t, size, buf)) | |
513 | goto out; | |
514 | err = -EFAULT; | |
515 | if (copy_to_user(req->buffer + start - req->start, buf, size)) | |
516 | goto out; | |
517 | } | |
518 | /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */ | |
519 | if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) { | |
520 | start = max(req->start, POS_HEADER_START); | |
521 | end = min(req->end, POS_HEADER_END); | |
522 | size = end - start + 1; | |
523 | err = -EINVAL; | |
524 | if (size < 0) | |
525 | goto out; | |
526 | err = -EIO; | |
527 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, | |
528 | R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY, | |
529 | R9_CURSER_ROW_0, start, COMMAND_END)) | |
530 | goto out; | |
531 | if (i2c_getdata(t, end - start + 1, buf)) | |
532 | goto out; | |
533 | err = -EFAULT; | |
534 | if (copy_to_user(req->buffer + start - req->start, buf, size)) | |
535 | goto out; | |
536 | } | |
537 | err = 0; | |
538 | out: | |
539 | kfree(buf); | |
540 | return err; | |
541 | } | |
542 | ||
543 | /* Stops the acquisition circuit given in dau_no. The page buffer associated | |
544 | * with this acquisition circuit will no more be updated. The other daus are | |
545 | * not affected. | |
546 | * | |
547 | * Return value: 0 if successful | |
548 | */ | |
549 | static inline int saa5246a_stop_dau(struct saa5246a_device *t, | |
550 | unsigned char dau_no) | |
551 | { | |
552 | if (dau_no >= NUM_DAUS) | |
553 | return -EINVAL; | |
554 | if (i2c_senddata(t, SAA5246A_REGISTER_R2, | |
555 | ||
556 | R2_IN_R3_SELECT_PAGE_HUNDREDS | | |
557 | dau_no << 4 | | |
558 | R2_BANK_0 | | |
559 | R2_HAMMING_CHECK_OFF, | |
560 | ||
561 | R3_PAGE_HUNDREDS_0 | | |
562 | R3_HOLD_PAGE | | |
563 | R3_PAGE_HUNDREDS_DO_NOT_CARE, | |
564 | ||
565 | COMMAND_END)) | |
566 | { | |
567 | return -EIO; | |
568 | } | |
e8be02a3 | 569 | t->is_searching[dau_no] = false; |
1da177e4 LT |
570 | return 0; |
571 | } | |
572 | ||
573 | /* Handles ioctls defined in videotext.h | |
574 | * | |
575 | * Returns 0 if successful | |
576 | */ | |
577 | static int do_saa5246a_ioctl(struct inode *inode, struct file *file, | |
578 | unsigned int cmd, void *arg) | |
579 | { | |
580 | struct video_device *vd = video_devdata(file); | |
581 | struct saa5246a_device *t=vd->priv; | |
582 | switch(cmd) | |
583 | { | |
584 | case VTXIOCGETINFO: | |
585 | { | |
586 | vtx_info_t *info = arg; | |
587 | ||
588 | info->version_major = MAJOR_VERSION; | |
589 | info->version_minor = MINOR_VERSION; | |
590 | info->numpages = NUM_DAUS; | |
591 | return 0; | |
592 | } | |
593 | ||
594 | case VTXIOCCLRPAGE: | |
595 | { | |
596 | vtx_pagereq_t *req = arg; | |
597 | ||
598 | if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS) | |
599 | return -EINVAL; | |
600 | memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0])); | |
601 | return 0; | |
602 | } | |
603 | ||
604 | case VTXIOCCLRFOUND: | |
605 | { | |
606 | vtx_pagereq_t *req = arg; | |
607 | ||
608 | if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS) | |
609 | return -EINVAL; | |
610 | return(saa5246a_clear_found_bit(t, req->pgbuf)); | |
611 | } | |
612 | ||
613 | case VTXIOCPAGEREQ: | |
614 | { | |
615 | vtx_pagereq_t *req = arg; | |
616 | ||
617 | return(saa5246a_request_page(t, req)); | |
618 | } | |
619 | ||
620 | case VTXIOCGETSTAT: | |
621 | { | |
622 | vtx_pagereq_t *req = arg; | |
623 | vtx_pageinfo_t info; | |
624 | int rval; | |
625 | ||
626 | if ((rval = saa5246a_get_status(t, &info, req->pgbuf))) | |
627 | return rval; | |
628 | if(copy_to_user(req->buffer, &info, | |
629 | sizeof(vtx_pageinfo_t))) | |
630 | return -EFAULT; | |
631 | return 0; | |
632 | } | |
633 | ||
634 | case VTXIOCGETPAGE: | |
635 | { | |
636 | vtx_pagereq_t *req = arg; | |
637 | ||
638 | return(saa5246a_get_page(t, req)); | |
639 | } | |
640 | ||
641 | case VTXIOCSTOPDAU: | |
642 | { | |
643 | vtx_pagereq_t *req = arg; | |
644 | ||
645 | return(saa5246a_stop_dau(t, req->pgbuf)); | |
646 | } | |
647 | ||
648 | case VTXIOCPUTPAGE: | |
649 | case VTXIOCSETDISP: | |
650 | case VTXIOCPUTSTAT: | |
651 | return 0; | |
652 | ||
653 | case VTXIOCCLRCACHE: | |
654 | { | |
655 | return 0; | |
656 | } | |
657 | ||
658 | case VTXIOCSETVIRT: | |
659 | { | |
660 | /* I do not know what "virtual mode" means */ | |
661 | return 0; | |
662 | } | |
663 | } | |
664 | return -EINVAL; | |
665 | } | |
666 | ||
667 | /* | |
668 | * Translates old vtx IOCTLs to new ones | |
669 | * | |
670 | * This keeps new kernel versions compatible with old userspace programs. | |
671 | */ | |
672 | static inline unsigned int vtx_fix_command(unsigned int cmd) | |
673 | { | |
674 | switch (cmd) { | |
675 | case VTXIOCGETINFO_OLD: | |
676 | cmd = VTXIOCGETINFO; | |
677 | break; | |
678 | case VTXIOCCLRPAGE_OLD: | |
679 | cmd = VTXIOCCLRPAGE; | |
680 | break; | |
681 | case VTXIOCCLRFOUND_OLD: | |
682 | cmd = VTXIOCCLRFOUND; | |
683 | break; | |
684 | case VTXIOCPAGEREQ_OLD: | |
685 | cmd = VTXIOCPAGEREQ; | |
686 | break; | |
687 | case VTXIOCGETSTAT_OLD: | |
688 | cmd = VTXIOCGETSTAT; | |
689 | break; | |
690 | case VTXIOCGETPAGE_OLD: | |
691 | cmd = VTXIOCGETPAGE; | |
692 | break; | |
693 | case VTXIOCSTOPDAU_OLD: | |
694 | cmd = VTXIOCSTOPDAU; | |
695 | break; | |
696 | case VTXIOCPUTPAGE_OLD: | |
697 | cmd = VTXIOCPUTPAGE; | |
698 | break; | |
699 | case VTXIOCSETDISP_OLD: | |
700 | cmd = VTXIOCSETDISP; | |
701 | break; | |
702 | case VTXIOCPUTSTAT_OLD: | |
703 | cmd = VTXIOCPUTSTAT; | |
704 | break; | |
705 | case VTXIOCCLRCACHE_OLD: | |
706 | cmd = VTXIOCCLRCACHE; | |
707 | break; | |
708 | case VTXIOCSETVIRT_OLD: | |
709 | cmd = VTXIOCSETVIRT; | |
710 | break; | |
711 | } | |
712 | return cmd; | |
713 | } | |
714 | ||
715 | /* | |
716 | * Handle the locking | |
717 | */ | |
718 | static int saa5246a_ioctl(struct inode *inode, struct file *file, | |
719 | unsigned int cmd, unsigned long arg) | |
720 | { | |
721 | struct video_device *vd = video_devdata(file); | |
722 | struct saa5246a_device *t = vd->priv; | |
723 | int err; | |
724 | ||
725 | cmd = vtx_fix_command(cmd); | |
3593cab5 | 726 | mutex_lock(&t->lock); |
1da177e4 | 727 | err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl); |
3593cab5 | 728 | mutex_unlock(&t->lock); |
1da177e4 LT |
729 | return err; |
730 | } | |
731 | ||
732 | static int saa5246a_open(struct inode *inode, struct file *file) | |
733 | { | |
734 | struct video_device *vd = video_devdata(file); | |
735 | struct saa5246a_device *t = vd->priv; | |
736 | int err; | |
737 | ||
738 | err = video_exclusive_open(inode,file); | |
739 | if (err < 0) | |
740 | return err; | |
741 | ||
742 | if (t->client==NULL) { | |
743 | err = -ENODEV; | |
744 | goto fail; | |
745 | } | |
746 | ||
747 | if (i2c_senddata(t, SAA5246A_REGISTER_R0, | |
748 | ||
749 | R0_SELECT_R11 | | |
750 | R0_PLL_TIME_CONSTANT_LONG | | |
751 | R0_ENABLE_nODD_EVEN_OUTPUT | | |
752 | R0_ENABLE_HDR_POLL | | |
753 | R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED | | |
754 | R0_NO_FREE_RUN_PLL | | |
755 | R0_NO_AUTOMATIC_FASTEXT_PROMPT, | |
756 | ||
757 | R1_NON_INTERLACED_312_312_LINES | | |
758 | R1_DEW | | |
759 | R1_EXTENDED_PACKET_DISABLE | | |
760 | R1_DAUS_ALL_ON | | |
761 | R1_8_BITS_NO_PARITY | | |
762 | R1_VCS_TO_SCS, | |
763 | ||
764 | COMMAND_END) || | |
765 | i2c_senddata(t, SAA5246A_REGISTER_R4, | |
766 | ||
767 | /* We do not care much for the TV display but nevertheless we | |
768 | * need the currently displayed page later because only on that | |
769 | * page the time is updated. */ | |
770 | R4_DISPLAY_PAGE_4, | |
771 | ||
772 | COMMAND_END)) | |
773 | { | |
774 | err = -EIO; | |
775 | goto fail; | |
776 | } | |
777 | ||
778 | return 0; | |
779 | ||
780 | fail: | |
781 | video_exclusive_release(inode,file); | |
782 | return err; | |
783 | } | |
784 | ||
785 | static int saa5246a_release(struct inode *inode, struct file *file) | |
786 | { | |
787 | struct video_device *vd = video_devdata(file); | |
788 | struct saa5246a_device *t = vd->priv; | |
789 | ||
790 | /* Stop all acquisition circuits. */ | |
791 | i2c_senddata(t, SAA5246A_REGISTER_R1, | |
792 | ||
793 | R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES | | |
794 | R1_DEW | | |
795 | R1_EXTENDED_PACKET_DISABLE | | |
796 | R1_DAUS_ALL_OFF | | |
797 | R1_8_BITS_NO_PARITY | | |
798 | R1_VCS_TO_SCS, | |
799 | ||
800 | COMMAND_END); | |
801 | video_exclusive_release(inode,file); | |
802 | return 0; | |
803 | } | |
804 | ||
805 | static int __init init_saa_5246a (void) | |
806 | { | |
807 | printk(KERN_INFO | |
808 | "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n", | |
809 | MAJOR_VERSION, MINOR_VERSION); | |
810 | return i2c_add_driver(&i2c_driver_videotext); | |
811 | } | |
812 | ||
813 | static void __exit cleanup_saa_5246a (void) | |
814 | { | |
815 | i2c_del_driver(&i2c_driver_videotext); | |
816 | } | |
817 | ||
818 | module_init(init_saa_5246a); | |
819 | module_exit(cleanup_saa_5246a); | |
820 | ||
fa027c2a | 821 | static const struct file_operations saa_fops = { |
1da177e4 LT |
822 | .owner = THIS_MODULE, |
823 | .open = saa5246a_open, | |
824 | .release = saa5246a_release, | |
825 | .ioctl = saa5246a_ioctl, | |
826 | .llseek = no_llseek, | |
827 | }; | |
828 | ||
829 | static struct video_device saa_template = | |
830 | { | |
831 | .owner = THIS_MODULE, | |
832 | .name = IF_NAME, | |
833 | .type = VID_TYPE_TELETEXT, | |
1da177e4 LT |
834 | .fops = &saa_fops, |
835 | .release = video_device_release, | |
836 | .minor = -1, | |
837 | }; |