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Linux 4.19.133
[linux/fpc-iii.git] / drivers / media / usb / cx231xx / cx231xx-vbi.c
blob10b2eb7338ad6e9fb6e83a4e06ebc68d75245708
1 /*
2 cx231xx_vbi.c - driver for Conexant Cx23100/101/102 USB video capture devices
3
4 Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
5 Based on cx88 driver
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include "cx231xx.h"
23 #include <linux/init.h>
24 #include <linux/list.h>
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/bitmap.h>
28 #include <linux/i2c.h>
29 #include <linux/mm.h>
30 #include <linux/mutex.h>
31 #include <linux/slab.h>
32
33 #include <media/v4l2-common.h>
34 #include <media/v4l2-ioctl.h>
35 #include <media/drv-intf/msp3400.h>
36 #include <media/tuner.h>
37
38 #include "cx231xx-vbi.h"
39
40 static inline void print_err_status(struct cx231xx *dev, int packet, int status)
41 {
42 char *errmsg = "Unknown";
43
44 switch (status) {
45 case -ENOENT:
46 errmsg = "unlinked synchronously";
47 break;
48 case -ECONNRESET:
49 errmsg = "unlinked asynchronously";
50 break;
51 case -ENOSR:
52 errmsg = "Buffer error (overrun)";
53 break;
54 case -EPIPE:
55 errmsg = "Stalled (device not responding)";
56 break;
57 case -EOVERFLOW:
58 errmsg = "Babble (bad cable?)";
59 break;
60 case -EPROTO:
61 errmsg = "Bit-stuff error (bad cable?)";
62 break;
63 case -EILSEQ:
64 errmsg = "CRC/Timeout (could be anything)";
65 break;
66 case -ETIME:
67 errmsg = "Device does not respond";
68 break;
69 }
70 if (packet < 0) {
71 dev_err(dev->dev,
72 "URB status %d [%s].\n", status, errmsg);
73 } else {
74 dev_err(dev->dev,
75 "URB packet %d, status %d [%s].\n",
76 packet, status, errmsg);
77 }
78 }
79
80 /*
81 * Controls the isoc copy of each urb packet
82 */
83 static inline int cx231xx_isoc_vbi_copy(struct cx231xx *dev, struct urb *urb)
84 {
85 struct cx231xx_dmaqueue *dma_q = urb->context;
86 int rc = 1;
87 unsigned char *p_buffer;
88 u32 bytes_parsed = 0, buffer_size = 0;
89 u8 sav_eav = 0;
90
91 if (!dev)
92 return 0;
93
94 if (dev->state & DEV_DISCONNECTED)
95 return 0;
96
97 if (urb->status < 0) {
98 print_err_status(dev, -1, urb->status);
99 if (urb->status == -ENOENT)
100 return 0;
101 }
102
103 /* get buffer pointer and length */
104 p_buffer = urb->transfer_buffer;
105 buffer_size = urb->actual_length;
106
107 if (buffer_size > 0) {
108 bytes_parsed = 0;
109
110 if (dma_q->is_partial_line) {
111 /* Handle the case where we were working on a partial
112 line */
113 sav_eav = dma_q->last_sav;
114 } else {
115 /* Check for a SAV/EAV overlapping the
116 buffer boundary */
117
118 sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer,
119 dma_q->partial_buf,
120 &bytes_parsed);
121 }
122
123 sav_eav &= 0xF0;
124 /* Get the first line if we have some portion of an SAV/EAV from
125 the last buffer or a partial line */
126 if (sav_eav) {
127 bytes_parsed += cx231xx_get_vbi_line(dev, dma_q,
128 sav_eav, /* SAV/EAV */
129 p_buffer + bytes_parsed, /* p_buffer */
130 buffer_size - bytes_parsed); /* buffer size */
131 }
132
133 /* Now parse data that is completely in this buffer */
134 dma_q->is_partial_line = 0;
135
136 while (bytes_parsed < buffer_size) {
137 u32 bytes_used = 0;
138
139 sav_eav = cx231xx_find_next_SAV_EAV(
140 p_buffer + bytes_parsed, /* p_buffer */
141 buffer_size - bytes_parsed, /* buffer size */
142 &bytes_used); /* bytes used to get SAV/EAV */
143
144 bytes_parsed += bytes_used;
145
146 sav_eav &= 0xF0;
147 if (sav_eav && (bytes_parsed < buffer_size)) {
148 bytes_parsed += cx231xx_get_vbi_line(dev,
149 dma_q, sav_eav, /* SAV/EAV */
150 p_buffer+bytes_parsed, /* p_buffer */
151 buffer_size-bytes_parsed);/*buf size*/
152 }
153 }
154
155 /* Save the last four bytes of the buffer so we can
156 check the buffer boundary condition next time */
157 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4);
158 bytes_parsed = 0;
159 }
160
161 return rc;
162 }
163
164 /* ------------------------------------------------------------------
165 Vbi buf operations
166 ------------------------------------------------------------------*/
167
168 static int
169 vbi_buffer_setup(struct videobuf_queue *vq, unsigned int *count,
170 unsigned int *size)
171 {
172 struct cx231xx_fh *fh = vq->priv_data;
173 struct cx231xx *dev = fh->dev;
174 u32 height = 0;
175
176 height = ((dev->norm & V4L2_STD_625_50) ?
177 PAL_VBI_LINES : NTSC_VBI_LINES);
178
179 *size = (dev->width * height * 2 * 2);
180 if (0 == *count)
181 *count = CX231XX_DEF_VBI_BUF;
182
183 if (*count < CX231XX_MIN_BUF)
184 *count = CX231XX_MIN_BUF;
185
186 return 0;
187 }
188
189 /* This is called *without* dev->slock held; please keep it that way */
190 static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
191 {
192 struct cx231xx_fh *fh = vq->priv_data;
193 struct cx231xx *dev = fh->dev;
194 unsigned long flags = 0;
195 BUG_ON(in_interrupt());
196
197 /* We used to wait for the buffer to finish here, but this didn't work
198 because, as we were keeping the state as VIDEOBUF_QUEUED,
199 videobuf_queue_cancel marked it as finished for us.
200 (Also, it could wedge forever if the hardware was misconfigured.)
201
202 This should be safe; by the time we get here, the buffer isn't
203 queued anymore. If we ever start marking the buffers as
204 VIDEOBUF_ACTIVE, it won't be, though.
205 */
206 spin_lock_irqsave(&dev->vbi_mode.slock, flags);
207 if (dev->vbi_mode.bulk_ctl.buf == buf)
208 dev->vbi_mode.bulk_ctl.buf = NULL;
209 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
210
211 videobuf_vmalloc_free(&buf->vb);
212 buf->vb.state = VIDEOBUF_NEEDS_INIT;
213 }
214
215 static int
216 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
217 enum v4l2_field field)
218 {
219 struct cx231xx_fh *fh = vq->priv_data;
220 struct cx231xx_buffer *buf =
221 container_of(vb, struct cx231xx_buffer, vb);
222 struct cx231xx *dev = fh->dev;
223 int rc = 0, urb_init = 0;
224 u32 height = 0;
225
226 height = ((dev->norm & V4L2_STD_625_50) ?
227 PAL_VBI_LINES : NTSC_VBI_LINES);
228 buf->vb.size = ((dev->width << 1) * height * 2);
229
230 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
231 return -EINVAL;
232
233 buf->vb.width = dev->width;
234 buf->vb.height = height;
235 buf->vb.field = field;
236 buf->vb.field = V4L2_FIELD_SEQ_TB;
237
238 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
239 rc = videobuf_iolock(vq, &buf->vb, NULL);
240 if (rc < 0)
241 goto fail;
242 }
243
244 if (!dev->vbi_mode.bulk_ctl.num_bufs)
245 urb_init = 1;
246
247 if (urb_init) {
248 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
249 CX231XX_NUM_VBI_BUFS,
250 dev->vbi_mode.alt_max_pkt_size[0],
251 cx231xx_isoc_vbi_copy);
252 if (rc < 0)
253 goto fail;
254 }
255
256 buf->vb.state = VIDEOBUF_PREPARED;
257 return 0;
258
259 fail:
260 free_buffer(vq, buf);
261 return rc;
262 }
263
264 static void
265 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
266 {
267 struct cx231xx_buffer *buf =
268 container_of(vb, struct cx231xx_buffer, vb);
269 struct cx231xx_fh *fh = vq->priv_data;
270 struct cx231xx *dev = fh->dev;
271 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
272
273 buf->vb.state = VIDEOBUF_QUEUED;
274 list_add_tail(&buf->vb.queue, &vidq->active);
275
276 }
277
278 static void vbi_buffer_release(struct videobuf_queue *vq,
279 struct videobuf_buffer *vb)
280 {
281 struct cx231xx_buffer *buf =
282 container_of(vb, struct cx231xx_buffer, vb);
283
284
285 free_buffer(vq, buf);
286 }
287
288 const struct videobuf_queue_ops cx231xx_vbi_qops = {
289 .buf_setup = vbi_buffer_setup,
290 .buf_prepare = vbi_buffer_prepare,
291 .buf_queue = vbi_buffer_queue,
292 .buf_release = vbi_buffer_release,
293 };
294
295 /* ------------------------------------------------------------------
296 URB control
297 ------------------------------------------------------------------*/
298
299 /*
300 * IRQ callback, called by URB callback
301 */
302 static void cx231xx_irq_vbi_callback(struct urb *urb)
303 {
304 struct cx231xx_dmaqueue *dma_q = urb->context;
305 struct cx231xx_video_mode *vmode =
306 container_of(dma_q, struct cx231xx_video_mode, vidq);
307 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
308 unsigned long flags;
309
310 switch (urb->status) {
311 case 0: /* success */
312 case -ETIMEDOUT: /* NAK */
313 break;
314 case -ECONNRESET: /* kill */
315 case -ENOENT:
316 case -ESHUTDOWN:
317 return;
318 default: /* error */
319 dev_err(dev->dev,
320 "urb completion error %d.\n", urb->status);
321 break;
322 }
323
324 /* Copy data from URB */
325 spin_lock_irqsave(&dev->vbi_mode.slock, flags);
326 dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb);
327 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
328
329 /* Reset status */
330 urb->status = 0;
331
332 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
333 if (urb->status) {
334 dev_err(dev->dev, "urb resubmit failed (error=%i)\n",
335 urb->status);
336 }
337 }
338
339 /*
340 * Stop and Deallocate URBs
341 */
342 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
343 {
344 struct urb *urb;
345 int i;
346
347 dev_dbg(dev->dev, "called cx231xx_uninit_vbi_isoc\n");
348
349 dev->vbi_mode.bulk_ctl.nfields = -1;
350 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
351 urb = dev->vbi_mode.bulk_ctl.urb[i];
352 if (urb) {
353 if (!irqs_disabled())
354 usb_kill_urb(urb);
355 else
356 usb_unlink_urb(urb);
357
358 if (dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
359
360 kfree(dev->vbi_mode.bulk_ctl.
361 transfer_buffer[i]);
362 dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
363 NULL;
364 }
365 usb_free_urb(urb);
366 dev->vbi_mode.bulk_ctl.urb[i] = NULL;
367 }
368 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = NULL;
369 }
370
371 kfree(dev->vbi_mode.bulk_ctl.urb);
372 kfree(dev->vbi_mode.bulk_ctl.transfer_buffer);
373
374 dev->vbi_mode.bulk_ctl.urb = NULL;
375 dev->vbi_mode.bulk_ctl.transfer_buffer = NULL;
376 dev->vbi_mode.bulk_ctl.num_bufs = 0;
377
378 cx231xx_capture_start(dev, 0, Vbi);
379 }
380 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
381
382 /*
383 * Allocate URBs and start IRQ
384 */
385 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
386 int num_bufs, int max_pkt_size,
387 int (*bulk_copy) (struct cx231xx *dev,
388 struct urb *urb))
389 {
390 struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
391 int i;
392 int sb_size, pipe;
393 struct urb *urb;
394 int rc;
395
396 dev_dbg(dev->dev, "called cx231xx_vbi_isoc\n");
397
398 /* De-allocates all pending stuff */
399 cx231xx_uninit_vbi_isoc(dev);
400
401 /* clear if any halt */
402 usb_clear_halt(dev->udev,
403 usb_rcvbulkpipe(dev->udev,
404 dev->vbi_mode.end_point_addr));
405
406 dev->vbi_mode.bulk_ctl.bulk_copy = bulk_copy;
407 dev->vbi_mode.bulk_ctl.num_bufs = num_bufs;
408 dma_q->pos = 0;
409 dma_q->is_partial_line = 0;
410 dma_q->last_sav = 0;
411 dma_q->current_field = -1;
412 dma_q->bytes_left_in_line = dev->width << 1;
413 dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
414 PAL_VBI_LINES : NTSC_VBI_LINES);
415 dma_q->lines_completed = 0;
416 for (i = 0; i < 8; i++)
417 dma_q->partial_buf[i] = 0;
418
419 dev->vbi_mode.bulk_ctl.urb = kcalloc(num_bufs, sizeof(void *),
420 GFP_KERNEL);
421 if (!dev->vbi_mode.bulk_ctl.urb) {
422 dev_err(dev->dev,
423 "cannot alloc memory for usb buffers\n");
424 return -ENOMEM;
425 }
426
427 dev->vbi_mode.bulk_ctl.transfer_buffer =
428 kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
429 if (!dev->vbi_mode.bulk_ctl.transfer_buffer) {
430 dev_err(dev->dev,
431 "cannot allocate memory for usbtransfer\n");
432 kfree(dev->vbi_mode.bulk_ctl.urb);
433 return -ENOMEM;
434 }
435
436 dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size;
437 dev->vbi_mode.bulk_ctl.buf = NULL;
438
439 sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size;
440
441 /* allocate urbs and transfer buffers */
442 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
443
444 urb = usb_alloc_urb(0, GFP_KERNEL);
445 if (!urb) {
446 cx231xx_uninit_vbi_isoc(dev);
447 return -ENOMEM;
448 }
449 dev->vbi_mode.bulk_ctl.urb[i] = urb;
450 urb->transfer_flags = 0;
451
452 dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
453 kzalloc(sb_size, GFP_KERNEL);
454 if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
455 dev_err(dev->dev,
456 "unable to allocate %i bytes for transfer buffer %i%s\n",
457 sb_size, i,
458 in_interrupt() ? " while in int" : "");
459 cx231xx_uninit_vbi_isoc(dev);
460 return -ENOMEM;
461 }
462
463 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
464 usb_fill_bulk_urb(urb, dev->udev, pipe,
465 dev->vbi_mode.bulk_ctl.transfer_buffer[i],
466 sb_size, cx231xx_irq_vbi_callback, dma_q);
467 }
468
469 init_waitqueue_head(&dma_q->wq);
470
471 /* submit urbs and enables IRQ */
472 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
473 rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC);
474 if (rc) {
475 dev_err(dev->dev,
476 "submit of urb %i failed (error=%i)\n", i, rc);
477 cx231xx_uninit_vbi_isoc(dev);
478 return rc;
479 }
480 }
481
482 cx231xx_capture_start(dev, 1, Vbi);
483
484 return 0;
485 }
486 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
487
488 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
489 u8 sav_eav, u8 *p_buffer, u32 buffer_size)
490 {
491 u32 bytes_copied = 0;
492 int current_field = -1;
493
494 switch (sav_eav) {
495
496 case SAV_VBI_FIELD1:
497 current_field = 1;
498 break;
499
500 case SAV_VBI_FIELD2:
501 current_field = 2;
502 break;
503 default:
504 break;
505 }
506
507 if (current_field < 0)
508 return bytes_copied;
509
510 dma_q->last_sav = sav_eav;
511
512 bytes_copied =
513 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
514 current_field);
515
516 return bytes_copied;
517 }
518
519 /*
520 * Announces that a buffer were filled and request the next
521 */
522 static inline void vbi_buffer_filled(struct cx231xx *dev,
523 struct cx231xx_dmaqueue *dma_q,
524 struct cx231xx_buffer *buf)
525 {
526 /* Advice that buffer was filled */
527 /* dev_dbg(dev->dev, "[%p/%d] wakeup\n", buf, buf->vb.i); */
528
529 buf->vb.state = VIDEOBUF_DONE;
530 buf->vb.field_count++;
531 v4l2_get_timestamp(&buf->vb.ts);
532
533 dev->vbi_mode.bulk_ctl.buf = NULL;
534
535 list_del(&buf->vb.queue);
536 wake_up(&buf->vb.done);
537 }
538
539 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
540 u8 *p_line, u32 length, int field_number)
541 {
542 u32 bytes_to_copy;
543 struct cx231xx_buffer *buf;
544 u32 _line_size = dev->width * 2;
545
546 if (dma_q->current_field == -1) {
547 /* Just starting up */
548 cx231xx_reset_vbi_buffer(dev, dma_q);
549 }
550
551 if (dma_q->current_field != field_number)
552 dma_q->lines_completed = 0;
553
554 /* get the buffer pointer */
555 buf = dev->vbi_mode.bulk_ctl.buf;
556
557 /* Remember the field number for next time */
558 dma_q->current_field = field_number;
559
560 bytes_to_copy = dma_q->bytes_left_in_line;
561 if (bytes_to_copy > length)
562 bytes_to_copy = length;
563
564 if (dma_q->lines_completed >= dma_q->lines_per_field) {
565 dma_q->bytes_left_in_line -= bytes_to_copy;
566 dma_q->is_partial_line =
567 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
568 return 0;
569 }
570
571 dma_q->is_partial_line = 1;
572
573 /* If we don't have a buffer, just return the number of bytes we would
574 have copied if we had a buffer. */
575 if (!buf) {
576 dma_q->bytes_left_in_line -= bytes_to_copy;
577 dma_q->is_partial_line =
578 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
579 return bytes_to_copy;
580 }
581
582 /* copy the data to video buffer */
583 cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
584
585 dma_q->pos += bytes_to_copy;
586 dma_q->bytes_left_in_line -= bytes_to_copy;
587
588 if (dma_q->bytes_left_in_line == 0) {
589
590 dma_q->bytes_left_in_line = _line_size;
591 dma_q->lines_completed++;
592 dma_q->is_partial_line = 0;
593
594 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
595
596 vbi_buffer_filled(dev, dma_q, buf);
597
598 dma_q->pos = 0;
599 dma_q->lines_completed = 0;
600 cx231xx_reset_vbi_buffer(dev, dma_q);
601 }
602 }
603
604 return bytes_to_copy;
605 }
606
607 /*
608 * video-buf generic routine to get the next available buffer
609 */
610 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
611 struct cx231xx_buffer **buf)
612 {
613 struct cx231xx_video_mode *vmode =
614 container_of(dma_q, struct cx231xx_video_mode, vidq);
615 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
616 char *outp;
617
618 if (list_empty(&dma_q->active)) {
619 dev_err(dev->dev, "No active queue to serve\n");
620 dev->vbi_mode.bulk_ctl.buf = NULL;
621 *buf = NULL;
622 return;
623 }
624
625 /* Get the next buffer */
626 *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
627
628 /* Cleans up buffer - Useful for testing for frame/URB loss */
629 outp = videobuf_to_vmalloc(&(*buf)->vb);
630 memset(outp, 0, (*buf)->vb.size);
631
632 dev->vbi_mode.bulk_ctl.buf = *buf;
633
634 return;
635 }
636
637 void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
638 struct cx231xx_dmaqueue *dma_q)
639 {
640 struct cx231xx_buffer *buf;
641
642 buf = dev->vbi_mode.bulk_ctl.buf;
643
644 if (buf == NULL) {
645 /* first try to get the buffer */
646 get_next_vbi_buf(dma_q, &buf);
647
648 dma_q->pos = 0;
649 dma_q->current_field = -1;
650 }
651
652 dma_q->bytes_left_in_line = dev->width << 1;
653 dma_q->lines_completed = 0;
654 }
655
656 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
657 u8 *p_buffer, u32 bytes_to_copy)
658 {
659 u8 *p_out_buffer = NULL;
660 u32 current_line_bytes_copied = 0;
661 struct cx231xx_buffer *buf;
662 u32 _line_size = dev->width << 1;
663 void *startwrite;
664 int offset, lencopy;
665
666 buf = dev->vbi_mode.bulk_ctl.buf;
667
668 if (buf == NULL)
669 return -EINVAL;
670
671 p_out_buffer = videobuf_to_vmalloc(&buf->vb);
672
673 if (dma_q->bytes_left_in_line != _line_size) {
674 current_line_bytes_copied =
675 _line_size - dma_q->bytes_left_in_line;
676 }
677
678 offset = (dma_q->lines_completed * _line_size) +
679 current_line_bytes_copied;
680
681 if (dma_q->current_field == 2) {
682 /* Populate the second half of the frame */
683 offset += (dev->width * 2 * dma_q->lines_per_field);
684 }
685
686 /* prepare destination address */
687 startwrite = p_out_buffer + offset;
688
689 lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
690 bytes_to_copy : dma_q->bytes_left_in_line;
691
692 memcpy(startwrite, p_buffer, lencopy);
693
694 return 0;
695 }
696
697 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
698 struct cx231xx_dmaqueue *dma_q)
699 {
700 u32 height = 0;
701
702 height = ((dev->norm & V4L2_STD_625_50) ?
703 PAL_VBI_LINES : NTSC_VBI_LINES);
704 if (dma_q->lines_completed == height && dma_q->current_field == 2)
705 return 1;
706 else
707 return 0;
708 }
Linux with added FPC-III support