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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / media / usb / cx231xx / cx231xx-vbi.c
blobd3bfe8e23b1ffdf656e7a9a582f591a5e458d63e
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
309 switch (urb->status) {
310 case 0: /* success */
311 case -ETIMEDOUT: /* NAK */
312 break;
313 case -ECONNRESET: /* kill */
314 case -ENOENT:
315 case -ESHUTDOWN:
316 return;
317 default: /* error */
318 dev_err(dev->dev,
319 "urb completition error %d.\n", urb->status);
320 break;
321 }
322
323 /* Copy data from URB */
324 spin_lock(&dev->vbi_mode.slock);
325 dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb);
326 spin_unlock(&dev->vbi_mode.slock);
327
328 /* Reset status */
329 urb->status = 0;
330
331 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
332 if (urb->status) {
333 dev_err(dev->dev, "urb resubmit failed (error=%i)\n",
334 urb->status);
335 }
336 }
337
338 /*
339 * Stop and Deallocate URBs
340 */
341 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
342 {
343 struct urb *urb;
344 int i;
345
346 dev_dbg(dev->dev, "called cx231xx_uninit_vbi_isoc\n");
347
348 dev->vbi_mode.bulk_ctl.nfields = -1;
349 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
350 urb = dev->vbi_mode.bulk_ctl.urb[i];
351 if (urb) {
352 if (!irqs_disabled())
353 usb_kill_urb(urb);
354 else
355 usb_unlink_urb(urb);
356
357 if (dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
358
359 kfree(dev->vbi_mode.bulk_ctl.
360 transfer_buffer[i]);
361 dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
362 NULL;
363 }
364 usb_free_urb(urb);
365 dev->vbi_mode.bulk_ctl.urb[i] = NULL;
366 }
367 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = NULL;
368 }
369
370 kfree(dev->vbi_mode.bulk_ctl.urb);
371 kfree(dev->vbi_mode.bulk_ctl.transfer_buffer);
372
373 dev->vbi_mode.bulk_ctl.urb = NULL;
374 dev->vbi_mode.bulk_ctl.transfer_buffer = NULL;
375 dev->vbi_mode.bulk_ctl.num_bufs = 0;
376
377 cx231xx_capture_start(dev, 0, Vbi);
378 }
379 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
380
381 /*
382 * Allocate URBs and start IRQ
383 */
384 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
385 int num_bufs, int max_pkt_size,
386 int (*bulk_copy) (struct cx231xx *dev,
387 struct urb *urb))
388 {
389 struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
390 int i;
391 int sb_size, pipe;
392 struct urb *urb;
393 int rc;
394
395 dev_dbg(dev->dev, "called cx231xx_vbi_isoc\n");
396
397 /* De-allocates all pending stuff */
398 cx231xx_uninit_vbi_isoc(dev);
399
400 /* clear if any halt */
401 usb_clear_halt(dev->udev,
402 usb_rcvbulkpipe(dev->udev,
403 dev->vbi_mode.end_point_addr));
404
405 dev->vbi_mode.bulk_ctl.bulk_copy = bulk_copy;
406 dev->vbi_mode.bulk_ctl.num_bufs = num_bufs;
407 dma_q->pos = 0;
408 dma_q->is_partial_line = 0;
409 dma_q->last_sav = 0;
410 dma_q->current_field = -1;
411 dma_q->bytes_left_in_line = dev->width << 1;
412 dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
413 PAL_VBI_LINES : NTSC_VBI_LINES);
414 dma_q->lines_completed = 0;
415 for (i = 0; i < 8; i++)
416 dma_q->partial_buf[i] = 0;
417
418 dev->vbi_mode.bulk_ctl.urb = kzalloc(sizeof(void *) * num_bufs,
419 GFP_KERNEL);
420 if (!dev->vbi_mode.bulk_ctl.urb) {
421 dev_err(dev->dev,
422 "cannot alloc memory for usb buffers\n");
423 return -ENOMEM;
424 }
425
426 dev->vbi_mode.bulk_ctl.transfer_buffer =
427 kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL);
428 if (!dev->vbi_mode.bulk_ctl.transfer_buffer) {
429 dev_err(dev->dev,
430 "cannot allocate memory for usbtransfer\n");
431 kfree(dev->vbi_mode.bulk_ctl.urb);
432 return -ENOMEM;
433 }
434
435 dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size;
436 dev->vbi_mode.bulk_ctl.buf = NULL;
437
438 sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size;
439
440 /* allocate urbs and transfer buffers */
441 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
442
443 urb = usb_alloc_urb(0, GFP_KERNEL);
444 if (!urb) {
445 cx231xx_uninit_vbi_isoc(dev);
446 return -ENOMEM;
447 }
448 dev->vbi_mode.bulk_ctl.urb[i] = urb;
449 urb->transfer_flags = 0;
450
451 dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
452 kzalloc(sb_size, GFP_KERNEL);
453 if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
454 dev_err(dev->dev,
455 "unable to allocate %i bytes for transfer buffer %i%s\n",
456 sb_size, i,
457 in_interrupt() ? " while in int" : "");
458 cx231xx_uninit_vbi_isoc(dev);
459 return -ENOMEM;
460 }
461
462 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
463 usb_fill_bulk_urb(urb, dev->udev, pipe,
464 dev->vbi_mode.bulk_ctl.transfer_buffer[i],
465 sb_size, cx231xx_irq_vbi_callback, dma_q);
466 }
467
468 init_waitqueue_head(&dma_q->wq);
469
470 /* submit urbs and enables IRQ */
471 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
472 rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC);
473 if (rc) {
474 dev_err(dev->dev,
475 "submit of urb %i failed (error=%i)\n", i, rc);
476 cx231xx_uninit_vbi_isoc(dev);
477 return rc;
478 }
479 }
480
481 cx231xx_capture_start(dev, 1, Vbi);
482
483 return 0;
484 }
485 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
486
487 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
488 u8 sav_eav, u8 *p_buffer, u32 buffer_size)
489 {
490 u32 bytes_copied = 0;
491 int current_field = -1;
492
493 switch (sav_eav) {
494
495 case SAV_VBI_FIELD1:
496 current_field = 1;
497 break;
498
499 case SAV_VBI_FIELD2:
500 current_field = 2;
501 break;
502 default:
503 break;
504 }
505
506 if (current_field < 0)
507 return bytes_copied;
508
509 dma_q->last_sav = sav_eav;
510
511 bytes_copied =
512 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
513 current_field);
514
515 return bytes_copied;
516 }
517
518 /*
519 * Announces that a buffer were filled and request the next
520 */
521 static inline void vbi_buffer_filled(struct cx231xx *dev,
522 struct cx231xx_dmaqueue *dma_q,
523 struct cx231xx_buffer *buf)
524 {
525 /* Advice that buffer was filled */
526 /* dev_dbg(dev->dev, "[%p/%d] wakeup\n", buf, buf->vb.i); */
527
528 buf->vb.state = VIDEOBUF_DONE;
529 buf->vb.field_count++;
530 v4l2_get_timestamp(&buf->vb.ts);
531
532 dev->vbi_mode.bulk_ctl.buf = NULL;
533
534 list_del(&buf->vb.queue);
535 wake_up(&buf->vb.done);
536 }
537
538 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
539 u8 *p_line, u32 length, int field_number)
540 {
541 u32 bytes_to_copy;
542 struct cx231xx_buffer *buf;
543 u32 _line_size = dev->width * 2;
544
545 if (dma_q->current_field == -1) {
546 /* Just starting up */
547 cx231xx_reset_vbi_buffer(dev, dma_q);
548 }
549
550 if (dma_q->current_field != field_number)
551 dma_q->lines_completed = 0;
552
553 /* get the buffer pointer */
554 buf = dev->vbi_mode.bulk_ctl.buf;
555
556 /* Remember the field number for next time */
557 dma_q->current_field = field_number;
558
559 bytes_to_copy = dma_q->bytes_left_in_line;
560 if (bytes_to_copy > length)
561 bytes_to_copy = length;
562
563 if (dma_q->lines_completed >= dma_q->lines_per_field) {
564 dma_q->bytes_left_in_line -= bytes_to_copy;
565 dma_q->is_partial_line =
566 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
567 return 0;
568 }
569
570 dma_q->is_partial_line = 1;
571
572 /* If we don't have a buffer, just return the number of bytes we would
573 have copied if we had a buffer. */
574 if (!buf) {
575 dma_q->bytes_left_in_line -= bytes_to_copy;
576 dma_q->is_partial_line =
577 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
578 return bytes_to_copy;
579 }
580
581 /* copy the data to video buffer */
582 cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
583
584 dma_q->pos += bytes_to_copy;
585 dma_q->bytes_left_in_line -= bytes_to_copy;
586
587 if (dma_q->bytes_left_in_line == 0) {
588
589 dma_q->bytes_left_in_line = _line_size;
590 dma_q->lines_completed++;
591 dma_q->is_partial_line = 0;
592
593 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
594
595 vbi_buffer_filled(dev, dma_q, buf);
596
597 dma_q->pos = 0;
598 dma_q->lines_completed = 0;
599 cx231xx_reset_vbi_buffer(dev, dma_q);
600 }
601 }
602
603 return bytes_to_copy;
604 }
605
606 /*
607 * video-buf generic routine to get the next available buffer
608 */
609 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
610 struct cx231xx_buffer **buf)
611 {
612 struct cx231xx_video_mode *vmode =
613 container_of(dma_q, struct cx231xx_video_mode, vidq);
614 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
615 char *outp;
616
617 if (list_empty(&dma_q->active)) {
618 dev_err(dev->dev, "No active queue to serve\n");
619 dev->vbi_mode.bulk_ctl.buf = NULL;
620 *buf = NULL;
621 return;
622 }
623
624 /* Get the next buffer */
625 *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
626
627 /* Cleans up buffer - Useful for testing for frame/URB loss */
628 outp = videobuf_to_vmalloc(&(*buf)->vb);
629 memset(outp, 0, (*buf)->vb.size);
630
631 dev->vbi_mode.bulk_ctl.buf = *buf;
632
633 return;
634 }
635
636 void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
637 struct cx231xx_dmaqueue *dma_q)
638 {
639 struct cx231xx_buffer *buf;
640
641 buf = dev->vbi_mode.bulk_ctl.buf;
642
643 if (buf == NULL) {
644 /* first try to get the buffer */
645 get_next_vbi_buf(dma_q, &buf);
646
647 dma_q->pos = 0;
648 dma_q->current_field = -1;
649 }
650
651 dma_q->bytes_left_in_line = dev->width << 1;
652 dma_q->lines_completed = 0;
653 }
654
655 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
656 u8 *p_buffer, u32 bytes_to_copy)
657 {
658 u8 *p_out_buffer = NULL;
659 u32 current_line_bytes_copied = 0;
660 struct cx231xx_buffer *buf;
661 u32 _line_size = dev->width << 1;
662 void *startwrite;
663 int offset, lencopy;
664
665 buf = dev->vbi_mode.bulk_ctl.buf;
666
667 if (buf == NULL)
668 return -EINVAL;
669
670 p_out_buffer = videobuf_to_vmalloc(&buf->vb);
671
672 if (dma_q->bytes_left_in_line != _line_size) {
673 current_line_bytes_copied =
674 _line_size - dma_q->bytes_left_in_line;
675 }
676
677 offset = (dma_q->lines_completed * _line_size) +
678 current_line_bytes_copied;
679
680 if (dma_q->current_field == 2) {
681 /* Populate the second half of the frame */
682 offset += (dev->width * 2 * dma_q->lines_per_field);
683 }
684
685 /* prepare destination address */
686 startwrite = p_out_buffer + offset;
687
688 lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
689 bytes_to_copy : dma_q->bytes_left_in_line;
690
691 memcpy(startwrite, p_buffer, lencopy);
692
693 return 0;
694 }
695
696 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
697 struct cx231xx_dmaqueue *dma_q)
698 {
699 u32 height = 0;
700
701 height = ((dev->norm & V4L2_STD_625_50) ?
702 PAL_VBI_LINES : NTSC_VBI_LINES);
703 if (dma_q->lines_completed == height && dma_q->current_field == 2)
704 return 1;
705 else
706 return 0;
707 }
CRIS linux kernel tree