/drivers/media/video/cx231xx/cx231xx-vbi.c
C | 714 lines | 500 code | 131 blank | 83 comment | 73 complexity | 0ac07318c7b408ca109e174feafad31d MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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 <linux/init.h>
23#include <linux/list.h>
24#include <linux/module.h>
25#include <linux/kernel.h>
26#include <linux/bitmap.h>
27#include <linux/usb.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/v4l2-chip-ident.h>
36#include <media/msp3400.h>
37#include <media/tuner.h>
38
39#include "cx231xx.h"
40#include "cx231xx-vbi.h"
41
42static inline void print_err_status(struct cx231xx *dev, int packet, int status)
43{
44 char *errmsg = "Unknown";
45
46 switch (status) {
47 case -ENOENT:
48 errmsg = "unlinked synchronuously";
49 break;
50 case -ECONNRESET:
51 errmsg = "unlinked asynchronuously";
52 break;
53 case -ENOSR:
54 errmsg = "Buffer error (overrun)";
55 break;
56 case -EPIPE:
57 errmsg = "Stalled (device not responding)";
58 break;
59 case -EOVERFLOW:
60 errmsg = "Babble (bad cable?)";
61 break;
62 case -EPROTO:
63 errmsg = "Bit-stuff error (bad cable?)";
64 break;
65 case -EILSEQ:
66 errmsg = "CRC/Timeout (could be anything)";
67 break;
68 case -ETIME:
69 errmsg = "Device does not respond";
70 break;
71 }
72 if (packet < 0) {
73 cx231xx_err(DRIVER_NAME "URB status %d [%s].\n", status,
74 errmsg);
75 } else {
76 cx231xx_err(DRIVER_NAME "URB packet %d, status %d [%s].\n",
77 packet, status, errmsg);
78 }
79}
80
81/*
82 * Controls the isoc copy of each urb packet
83 */
84static inline int cx231xx_isoc_vbi_copy(struct cx231xx *dev, struct urb *urb)
85{
86 struct cx231xx_buffer *buf;
87 struct cx231xx_dmaqueue *dma_q = urb->context;
88 int rc = 1;
89 unsigned char *p_buffer;
90 u32 bytes_parsed = 0, buffer_size = 0;
91 u8 sav_eav = 0;
92
93 if (!dev)
94 return 0;
95
96 if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
97 return 0;
98
99 if (urb->status < 0) {
100 print_err_status(dev, -1, urb->status);
101 if (urb->status == -ENOENT)
102 return 0;
103 }
104
105 buf = dev->vbi_mode.bulk_ctl.buf;
106
107 /* get buffer pointer and length */
108 p_buffer = urb->transfer_buffer;
109 buffer_size = urb->actual_length;
110
111 if (buffer_size > 0) {
112 bytes_parsed = 0;
113
114 if (dma_q->is_partial_line) {
115 /* Handle the case where we were working on a partial
116 line */
117 sav_eav = dma_q->last_sav;
118 } else {
119 /* Check for a SAV/EAV overlapping the
120 buffer boundary */
121
122 sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer,
123 dma_q->partial_buf,
124 &bytes_parsed);
125 }
126
127 sav_eav &= 0xF0;
128 /* Get the first line if we have some portion of an SAV/EAV from
129 the last buffer or a partial line */
130 if (sav_eav) {
131 bytes_parsed += cx231xx_get_vbi_line(dev, dma_q,
132 sav_eav, /* SAV/EAV */
133 p_buffer + bytes_parsed, /* p_buffer */
134 buffer_size - bytes_parsed); /* buffer size */
135 }
136
137 /* Now parse data that is completely in this buffer */
138 dma_q->is_partial_line = 0;
139
140 while (bytes_parsed < buffer_size) {
141 u32 bytes_used = 0;
142
143 sav_eav = cx231xx_find_next_SAV_EAV(
144 p_buffer + bytes_parsed, /* p_buffer */
145 buffer_size - bytes_parsed, /* buffer size */
146 &bytes_used); /* bytes used to get SAV/EAV */
147
148 bytes_parsed += bytes_used;
149
150 sav_eav &= 0xF0;
151 if (sav_eav && (bytes_parsed < buffer_size)) {
152 bytes_parsed += cx231xx_get_vbi_line(dev,
153 dma_q, sav_eav, /* SAV/EAV */
154 p_buffer+bytes_parsed, /* p_buffer */
155 buffer_size-bytes_parsed);/*buf size*/
156 }
157 }
158
159 /* Save the last four bytes of the buffer so we can
160 check the buffer boundary condition next time */
161 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4);
162 bytes_parsed = 0;
163 }
164
165 return rc;
166}
167
168/* ------------------------------------------------------------------
169 Vbi buf operations
170 ------------------------------------------------------------------*/
171
172static int
173vbi_buffer_setup(struct videobuf_queue *vq, unsigned int *count,
174 unsigned int *size)
175{
176 struct cx231xx_fh *fh = vq->priv_data;
177 struct cx231xx *dev = fh->dev;
178 u32 height = 0;
179
180 height = ((dev->norm & V4L2_STD_625_50) ?
181 PAL_VBI_LINES : NTSC_VBI_LINES);
182
183 *size = (dev->width * height * 2 * 2);
184 if (0 == *count)
185 *count = CX231XX_DEF_VBI_BUF;
186
187 if (*count < CX231XX_MIN_BUF)
188 *count = CX231XX_MIN_BUF;
189
190 return 0;
191}
192
193/* This is called *without* dev->slock held; please keep it that way */
194static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
195{
196 struct cx231xx_fh *fh = vq->priv_data;
197 struct cx231xx *dev = fh->dev;
198 unsigned long flags = 0;
199 if (in_interrupt())
200 BUG();
201
202 /* We used to wait for the buffer to finish here, but this didn't work
203 because, as we were keeping the state as VIDEOBUF_QUEUED,
204 videobuf_queue_cancel marked it as finished for us.
205 (Also, it could wedge forever if the hardware was misconfigured.)
206
207 This should be safe; by the time we get here, the buffer isn't
208 queued anymore. If we ever start marking the buffers as
209 VIDEOBUF_ACTIVE, it won't be, though.
210 */
211 spin_lock_irqsave(&dev->vbi_mode.slock, flags);
212 if (dev->vbi_mode.bulk_ctl.buf == buf)
213 dev->vbi_mode.bulk_ctl.buf = NULL;
214 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
215
216 videobuf_vmalloc_free(&buf->vb);
217 buf->vb.state = VIDEOBUF_NEEDS_INIT;
218}
219
220static int
221vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
222 enum v4l2_field field)
223{
224 struct cx231xx_fh *fh = vq->priv_data;
225 struct cx231xx_buffer *buf =
226 container_of(vb, struct cx231xx_buffer, vb);
227 struct cx231xx *dev = fh->dev;
228 int rc = 0, urb_init = 0;
229 u32 height = 0;
230
231 height = ((dev->norm & V4L2_STD_625_50) ?
232 PAL_VBI_LINES : NTSC_VBI_LINES);
233 buf->vb.size = ((dev->width << 1) * height * 2);
234
235 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
236 return -EINVAL;
237
238 buf->vb.width = dev->width;
239 buf->vb.height = height;
240 buf->vb.field = field;
241 buf->vb.field = V4L2_FIELD_SEQ_TB;
242
243 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
244 rc = videobuf_iolock(vq, &buf->vb, NULL);
245 if (rc < 0)
246 goto fail;
247 }
248
249 if (!dev->vbi_mode.bulk_ctl.num_bufs)
250 urb_init = 1;
251
252 if (urb_init) {
253 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
254 CX231XX_NUM_VBI_BUFS,
255 dev->vbi_mode.alt_max_pkt_size[0],
256 cx231xx_isoc_vbi_copy);
257 if (rc < 0)
258 goto fail;
259 }
260
261 buf->vb.state = VIDEOBUF_PREPARED;
262 return 0;
263
264fail:
265 free_buffer(vq, buf);
266 return rc;
267}
268
269static void
270vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
271{
272 struct cx231xx_buffer *buf =
273 container_of(vb, struct cx231xx_buffer, vb);
274 struct cx231xx_fh *fh = vq->priv_data;
275 struct cx231xx *dev = fh->dev;
276 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
277
278 buf->vb.state = VIDEOBUF_QUEUED;
279 list_add_tail(&buf->vb.queue, &vidq->active);
280
281}
282
283static void vbi_buffer_release(struct videobuf_queue *vq,
284 struct videobuf_buffer *vb)
285{
286 struct cx231xx_buffer *buf =
287 container_of(vb, struct cx231xx_buffer, vb);
288
289
290 free_buffer(vq, buf);
291}
292
293struct videobuf_queue_ops cx231xx_vbi_qops = {
294 .buf_setup = vbi_buffer_setup,
295 .buf_prepare = vbi_buffer_prepare,
296 .buf_queue = vbi_buffer_queue,
297 .buf_release = vbi_buffer_release,
298};
299
300/* ------------------------------------------------------------------
301 URB control
302 ------------------------------------------------------------------*/
303
304/*
305 * IRQ callback, called by URB callback
306 */
307static void cx231xx_irq_vbi_callback(struct urb *urb)
308{
309 struct cx231xx_dmaqueue *dma_q = urb->context;
310 struct cx231xx_video_mode *vmode =
311 container_of(dma_q, struct cx231xx_video_mode, vidq);
312 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
313 int rc;
314
315 switch (urb->status) {
316 case 0: /* success */
317 case -ETIMEDOUT: /* NAK */
318 break;
319 case -ECONNRESET: /* kill */
320 case -ENOENT:
321 case -ESHUTDOWN:
322 return;
323 default: /* error */
324 cx231xx_err(DRIVER_NAME "urb completition error %d.\n",
325 urb->status);
326 break;
327 }
328
329 /* Copy data from URB */
330 spin_lock(&dev->vbi_mode.slock);
331 rc = dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb);
332 spin_unlock(&dev->vbi_mode.slock);
333
334 /* Reset status */
335 urb->status = 0;
336
337 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
338 if (urb->status) {
339 cx231xx_err(DRIVER_NAME "urb resubmit failed (error=%i)\n",
340 urb->status);
341 }
342}
343
344/*
345 * Stop and Deallocate URBs
346 */
347void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
348{
349 struct urb *urb;
350 int i;
351
352 cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_uninit_vbi_isoc\n");
353
354 dev->vbi_mode.bulk_ctl.nfields = -1;
355 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
356 urb = dev->vbi_mode.bulk_ctl.urb[i];
357 if (urb) {
358 if (!irqs_disabled())
359 usb_kill_urb(urb);
360 else
361 usb_unlink_urb(urb);
362
363 if (dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
364
365 kfree(dev->vbi_mode.bulk_ctl.
366 transfer_buffer[i]);
367 dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
368 NULL;
369 }
370 usb_free_urb(urb);
371 dev->vbi_mode.bulk_ctl.urb[i] = NULL;
372 }
373 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = NULL;
374 }
375
376 kfree(dev->vbi_mode.bulk_ctl.urb);
377 kfree(dev->vbi_mode.bulk_ctl.transfer_buffer);
378
379 dev->vbi_mode.bulk_ctl.urb = NULL;
380 dev->vbi_mode.bulk_ctl.transfer_buffer = NULL;
381 dev->vbi_mode.bulk_ctl.num_bufs = 0;
382
383 cx231xx_capture_start(dev, 0, Vbi);
384}
385EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
386
387/*
388 * Allocate URBs and start IRQ
389 */
390int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
391 int num_bufs, int max_pkt_size,
392 int (*bulk_copy) (struct cx231xx *dev,
393 struct urb *urb))
394{
395 struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
396 int i;
397 int sb_size, pipe;
398 struct urb *urb;
399 int rc;
400
401 cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_prepare_isoc\n");
402
403 /* De-allocates all pending stuff */
404 cx231xx_uninit_vbi_isoc(dev);
405
406 /* clear if any halt */
407 usb_clear_halt(dev->udev,
408 usb_rcvbulkpipe(dev->udev,
409 dev->vbi_mode.end_point_addr));
410
411 dev->vbi_mode.bulk_ctl.bulk_copy = bulk_copy;
412 dev->vbi_mode.bulk_ctl.num_bufs = num_bufs;
413 dma_q->pos = 0;
414 dma_q->is_partial_line = 0;
415 dma_q->last_sav = 0;
416 dma_q->current_field = -1;
417 dma_q->bytes_left_in_line = dev->width << 1;
418 dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
419 PAL_VBI_LINES : NTSC_VBI_LINES);
420 dma_q->lines_completed = 0;
421 for (i = 0; i < 8; i++)
422 dma_q->partial_buf[i] = 0;
423
424 dev->vbi_mode.bulk_ctl.urb = kzalloc(sizeof(void *) * num_bufs,
425 GFP_KERNEL);
426 if (!dev->vbi_mode.bulk_ctl.urb) {
427 cx231xx_errdev("cannot alloc memory for usb buffers\n");
428 return -ENOMEM;
429 }
430
431 dev->vbi_mode.bulk_ctl.transfer_buffer =
432 kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL);
433 if (!dev->vbi_mode.bulk_ctl.transfer_buffer) {
434 cx231xx_errdev("cannot allocate memory for usbtransfer\n");
435 kfree(dev->vbi_mode.bulk_ctl.urb);
436 return -ENOMEM;
437 }
438
439 dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size;
440 dev->vbi_mode.bulk_ctl.buf = NULL;
441
442 sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size;
443
444 /* allocate urbs and transfer buffers */
445 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
446
447 urb = usb_alloc_urb(0, GFP_KERNEL);
448 if (!urb) {
449 cx231xx_err(DRIVER_NAME
450 ": cannot alloc bulk_ctl.urb %i\n", i);
451 cx231xx_uninit_vbi_isoc(dev);
452 return -ENOMEM;
453 }
454 dev->vbi_mode.bulk_ctl.urb[i] = urb;
455 urb->transfer_flags = 0;
456
457 dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
458 kzalloc(sb_size, GFP_KERNEL);
459 if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
460 cx231xx_err(DRIVER_NAME
461 ": unable to allocate %i bytes for transfer"
462 " buffer %i%s\n", sb_size, i,
463 in_interrupt() ? " while in int" : "");
464 cx231xx_uninit_vbi_isoc(dev);
465 return -ENOMEM;
466 }
467
468 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
469 usb_fill_bulk_urb(urb, dev->udev, pipe,
470 dev->vbi_mode.bulk_ctl.transfer_buffer[i],
471 sb_size, cx231xx_irq_vbi_callback, dma_q);
472 }
473
474 init_waitqueue_head(&dma_q->wq);
475
476 /* submit urbs and enables IRQ */
477 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
478 rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC);
479 if (rc) {
480 cx231xx_err(DRIVER_NAME
481 ": submit of urb %i failed (error=%i)\n", i,
482 rc);
483 cx231xx_uninit_vbi_isoc(dev);
484 return rc;
485 }
486 }
487
488 cx231xx_capture_start(dev, 1, Vbi);
489
490 return 0;
491}
492EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
493
494u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
495 u8 sav_eav, u8 *p_buffer, u32 buffer_size)
496{
497 u32 bytes_copied = 0;
498 int current_field = -1;
499
500 switch (sav_eav) {
501
502 case SAV_VBI_FIELD1:
503 current_field = 1;
504 break;
505
506 case SAV_VBI_FIELD2:
507 current_field = 2;
508 break;
509 default:
510 break;
511 }
512
513 if (current_field < 0)
514 return bytes_copied;
515
516 dma_q->last_sav = sav_eav;
517
518 bytes_copied =
519 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
520 current_field);
521
522 return bytes_copied;
523}
524
525/*
526 * Announces that a buffer were filled and request the next
527 */
528static inline void vbi_buffer_filled(struct cx231xx *dev,
529 struct cx231xx_dmaqueue *dma_q,
530 struct cx231xx_buffer *buf)
531{
532 /* Advice that buffer was filled */
533 /* cx231xx_info(DRIVER_NAME "[%p/%d] wakeup\n", buf, buf->vb.i); */
534
535 buf->vb.state = VIDEOBUF_DONE;
536 buf->vb.field_count++;
537 do_gettimeofday(&buf->vb.ts);
538
539 dev->vbi_mode.bulk_ctl.buf = NULL;
540
541 list_del(&buf->vb.queue);
542 wake_up(&buf->vb.done);
543}
544
545u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
546 u8 *p_line, u32 length, int field_number)
547{
548 u32 bytes_to_copy;
549 struct cx231xx_buffer *buf;
550 u32 _line_size = dev->width * 2;
551
552 if (dma_q->current_field == -1) {
553 /* Just starting up */
554 cx231xx_reset_vbi_buffer(dev, dma_q);
555 }
556
557 if (dma_q->current_field != field_number)
558 dma_q->lines_completed = 0;
559
560 /* get the buffer pointer */
561 buf = dev->vbi_mode.bulk_ctl.buf;
562
563 /* Remember the field number for next time */
564 dma_q->current_field = field_number;
565
566 bytes_to_copy = dma_q->bytes_left_in_line;
567 if (bytes_to_copy > length)
568 bytes_to_copy = length;
569
570 if (dma_q->lines_completed >= dma_q->lines_per_field) {
571 dma_q->bytes_left_in_line -= bytes_to_copy;
572 dma_q->is_partial_line =
573 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
574 return 0;
575 }
576
577 dma_q->is_partial_line = 1;
578
579 /* If we don't have a buffer, just return the number of bytes we would
580 have copied if we had a buffer. */
581 if (!buf) {
582 dma_q->bytes_left_in_line -= bytes_to_copy;
583 dma_q->is_partial_line =
584 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
585 return bytes_to_copy;
586 }
587
588 /* copy the data to video buffer */
589 cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
590
591 dma_q->pos += bytes_to_copy;
592 dma_q->bytes_left_in_line -= bytes_to_copy;
593
594 if (dma_q->bytes_left_in_line == 0) {
595
596 dma_q->bytes_left_in_line = _line_size;
597 dma_q->lines_completed++;
598 dma_q->is_partial_line = 0;
599
600 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
601
602 vbi_buffer_filled(dev, dma_q, buf);
603
604 dma_q->pos = 0;
605 dma_q->lines_completed = 0;
606 cx231xx_reset_vbi_buffer(dev, dma_q);
607 }
608 }
609
610 return bytes_to_copy;
611}
612
613/*
614 * video-buf generic routine to get the next available buffer
615 */
616static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
617 struct cx231xx_buffer **buf)
618{
619 struct cx231xx_video_mode *vmode =
620 container_of(dma_q, struct cx231xx_video_mode, vidq);
621 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
622 char *outp;
623
624 if (list_empty(&dma_q->active)) {
625 cx231xx_err(DRIVER_NAME ": No active queue to serve\n");
626 dev->vbi_mode.bulk_ctl.buf = NULL;
627 *buf = NULL;
628 return;
629 }
630
631 /* Get the next buffer */
632 *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
633
634 /* Cleans up buffer - Useful for testing for frame/URB loss */
635 outp = videobuf_to_vmalloc(&(*buf)->vb);
636 memset(outp, 0, (*buf)->vb.size);
637
638 dev->vbi_mode.bulk_ctl.buf = *buf;
639
640 return;
641}
642
643void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
644 struct cx231xx_dmaqueue *dma_q)
645{
646 struct cx231xx_buffer *buf;
647
648 buf = dev->vbi_mode.bulk_ctl.buf;
649
650 if (buf == NULL) {
651 /* first try to get the buffer */
652 get_next_vbi_buf(dma_q, &buf);
653
654 dma_q->pos = 0;
655 dma_q->current_field = -1;
656 }
657
658 dma_q->bytes_left_in_line = dev->width << 1;
659 dma_q->lines_completed = 0;
660}
661
662int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
663 u8 *p_buffer, u32 bytes_to_copy)
664{
665 u8 *p_out_buffer = NULL;
666 u32 current_line_bytes_copied = 0;
667 struct cx231xx_buffer *buf;
668 u32 _line_size = dev->width << 1;
669 void *startwrite;
670 int offset, lencopy;
671
672 buf = dev->vbi_mode.bulk_ctl.buf;
673
674 if (buf == NULL)
675 return -EINVAL;
676
677 p_out_buffer = videobuf_to_vmalloc(&buf->vb);
678
679 if (dma_q->bytes_left_in_line != _line_size) {
680 current_line_bytes_copied =
681 _line_size - dma_q->bytes_left_in_line;
682 }
683
684 offset = (dma_q->lines_completed * _line_size) +
685 current_line_bytes_copied;
686
687 if (dma_q->current_field == 2) {
688 /* Populate the second half of the frame */
689 offset += (dev->width * 2 * dma_q->lines_per_field);
690 }
691
692 /* prepare destination address */
693 startwrite = p_out_buffer + offset;
694
695 lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
696 bytes_to_copy : dma_q->bytes_left_in_line;
697
698 memcpy(startwrite, p_buffer, lencopy);
699
700 return 0;
701}
702
703u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
704 struct cx231xx_dmaqueue *dma_q)
705{
706 u32 height = 0;
707
708 height = ((dev->norm & V4L2_STD_625_50) ?
709 PAL_VBI_LINES : NTSC_VBI_LINES);
710 if (dma_q->lines_completed == height && dma_q->current_field == 2)
711 return 1;
712 else
713 return 0;
714}