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sched: Remove double_rq_lock() from __migrate_task()
[linux/fpc-iii.git] / drivers / media / usb / cx231xx / cx231xx-vbi.c
blobc02794274f516812e47f292f6fce60522a8fde0e
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/msp3400.h>
36 #include <media/tuner.h>
37
38 #include "cx231xx.h"
39 #include "cx231xx-vbi.h"
40
41 static inline void print_err_status(struct cx231xx *dev, int packet, int status)
42 {
43 char *errmsg = "Unknown";
44
45 switch (status) {
46 case -ENOENT:
47 errmsg = "unlinked synchronuously";
48 break;
49 case -ECONNRESET:
50 errmsg = "unlinked asynchronuously";
51 break;
52 case -ENOSR:
53 errmsg = "Buffer error (overrun)";
54 break;
55 case -EPIPE:
56 errmsg = "Stalled (device not responding)";
57 break;
58 case -EOVERFLOW:
59 errmsg = "Babble (bad cable?)";
60 break;
61 case -EPROTO:
62 errmsg = "Bit-stuff error (bad cable?)";
63 break;
64 case -EILSEQ:
65 errmsg = "CRC/Timeout (could be anything)";
66 break;
67 case -ETIME:
68 errmsg = "Device does not respond";
69 break;
70 }
71 if (packet < 0) {
72 cx231xx_err("URB status %d [%s].\n", status,
73 errmsg);
74 } else {
75 cx231xx_err("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 if (in_interrupt())
196 BUG();
197
198 /* We used to wait for the buffer to finish here, but this didn't work
199 because, as we were keeping the state as VIDEOBUF_QUEUED,
200 videobuf_queue_cancel marked it as finished for us.
201 (Also, it could wedge forever if the hardware was misconfigured.)
202
203 This should be safe; by the time we get here, the buffer isn't
204 queued anymore. If we ever start marking the buffers as
205 VIDEOBUF_ACTIVE, it won't be, though.
206 */
207 spin_lock_irqsave(&dev->vbi_mode.slock, flags);
208 if (dev->vbi_mode.bulk_ctl.buf == buf)
209 dev->vbi_mode.bulk_ctl.buf = NULL;
210 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
211
212 videobuf_vmalloc_free(&buf->vb);
213 buf->vb.state = VIDEOBUF_NEEDS_INIT;
214 }
215
216 static int
217 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
218 enum v4l2_field field)
219 {
220 struct cx231xx_fh *fh = vq->priv_data;
221 struct cx231xx_buffer *buf =
222 container_of(vb, struct cx231xx_buffer, vb);
223 struct cx231xx *dev = fh->dev;
224 int rc = 0, urb_init = 0;
225 u32 height = 0;
226
227 height = ((dev->norm & V4L2_STD_625_50) ?
228 PAL_VBI_LINES : NTSC_VBI_LINES);
229 buf->vb.size = ((dev->width << 1) * height * 2);
230
231 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
232 return -EINVAL;
233
234 buf->vb.width = dev->width;
235 buf->vb.height = height;
236 buf->vb.field = field;
237 buf->vb.field = V4L2_FIELD_SEQ_TB;
238
239 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
240 rc = videobuf_iolock(vq, &buf->vb, NULL);
241 if (rc < 0)
242 goto fail;
243 }
244
245 if (!dev->vbi_mode.bulk_ctl.num_bufs)
246 urb_init = 1;
247
248 if (urb_init) {
249 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
250 CX231XX_NUM_VBI_BUFS,
251 dev->vbi_mode.alt_max_pkt_size[0],
252 cx231xx_isoc_vbi_copy);
253 if (rc < 0)
254 goto fail;
255 }
256
257 buf->vb.state = VIDEOBUF_PREPARED;
258 return 0;
259
260 fail:
261 free_buffer(vq, buf);
262 return rc;
263 }
264
265 static void
266 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
267 {
268 struct cx231xx_buffer *buf =
269 container_of(vb, struct cx231xx_buffer, vb);
270 struct cx231xx_fh *fh = vq->priv_data;
271 struct cx231xx *dev = fh->dev;
272 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
273
274 buf->vb.state = VIDEOBUF_QUEUED;
275 list_add_tail(&buf->vb.queue, &vidq->active);
276
277 }
278
279 static void vbi_buffer_release(struct videobuf_queue *vq,
280 struct videobuf_buffer *vb)
281 {
282 struct cx231xx_buffer *buf =
283 container_of(vb, struct cx231xx_buffer, vb);
284
285
286 free_buffer(vq, buf);
287 }
288
289 struct videobuf_queue_ops cx231xx_vbi_qops = {
290 .buf_setup = vbi_buffer_setup,
291 .buf_prepare = vbi_buffer_prepare,
292 .buf_queue = vbi_buffer_queue,
293 .buf_release = vbi_buffer_release,
294 };
295
296 /* ------------------------------------------------------------------
297 URB control
298 ------------------------------------------------------------------*/
299
300 /*
301 * IRQ callback, called by URB callback
302 */
303 static void cx231xx_irq_vbi_callback(struct urb *urb)
304 {
305 struct cx231xx_dmaqueue *dma_q = urb->context;
306 struct cx231xx_video_mode *vmode =
307 container_of(dma_q, struct cx231xx_video_mode, vidq);
308 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
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 cx231xx_err("urb completition error %d.\n",
320 urb->status);
321 break;
322 }
323
324 /* Copy data from URB */
325 spin_lock(&dev->vbi_mode.slock);
326 dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb);
327 spin_unlock(&dev->vbi_mode.slock);
328
329 /* Reset status */
330 urb->status = 0;
331
332 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
333 if (urb->status) {
334 cx231xx_err("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 cx231xx_info("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 cx231xx_info("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 = kzalloc(sizeof(void *) * num_bufs,
420 GFP_KERNEL);
421 if (!dev->vbi_mode.bulk_ctl.urb) {
422 cx231xx_errdev("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 cx231xx_errdev("cannot allocate memory for usbtransfer\n");
430 kfree(dev->vbi_mode.bulk_ctl.urb);
431 return -ENOMEM;
432 }
433
434 dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size;
435 dev->vbi_mode.bulk_ctl.buf = NULL;
436
437 sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size;
438
439 /* allocate urbs and transfer buffers */
440 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
441
442 urb = usb_alloc_urb(0, GFP_KERNEL);
443 if (!urb) {
444 cx231xx_err("cannot alloc bulk_ctl.urb %i\n", i);
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 cx231xx_err("unable to allocate %i bytes for transfer"
455 " buffer %i%s\n", sb_size, i,
456 in_interrupt() ? " while in int" : "");
457 cx231xx_uninit_vbi_isoc(dev);
458 return -ENOMEM;
459 }
460
461 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
462 usb_fill_bulk_urb(urb, dev->udev, pipe,
463 dev->vbi_mode.bulk_ctl.transfer_buffer[i],
464 sb_size, cx231xx_irq_vbi_callback, dma_q);
465 }
466
467 init_waitqueue_head(&dma_q->wq);
468
469 /* submit urbs and enables IRQ */
470 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
471 rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC);
472 if (rc) {
473 cx231xx_err("submit of urb %i failed (error=%i)\n", i,
474 rc);
475 cx231xx_uninit_vbi_isoc(dev);
476 return rc;
477 }
478 }
479
480 cx231xx_capture_start(dev, 1, Vbi);
481
482 return 0;
483 }
484 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
485
486 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
487 u8 sav_eav, u8 *p_buffer, u32 buffer_size)
488 {
489 u32 bytes_copied = 0;
490 int current_field = -1;
491
492 switch (sav_eav) {
493
494 case SAV_VBI_FIELD1:
495 current_field = 1;
496 break;
497
498 case SAV_VBI_FIELD2:
499 current_field = 2;
500 break;
501 default:
502 break;
503 }
504
505 if (current_field < 0)
506 return bytes_copied;
507
508 dma_q->last_sav = sav_eav;
509
510 bytes_copied =
511 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
512 current_field);
513
514 return bytes_copied;
515 }
516
517 /*
518 * Announces that a buffer were filled and request the next
519 */
520 static inline void vbi_buffer_filled(struct cx231xx *dev,
521 struct cx231xx_dmaqueue *dma_q,
522 struct cx231xx_buffer *buf)
523 {
524 /* Advice that buffer was filled */
525 /* cx231xx_info("[%p/%d] wakeup\n", buf, buf->vb.i); */
526
527 buf->vb.state = VIDEOBUF_DONE;
528 buf->vb.field_count++;
529 v4l2_get_timestamp(&buf->vb.ts);
530
531 dev->vbi_mode.bulk_ctl.buf = NULL;
532
533 list_del(&buf->vb.queue);
534 wake_up(&buf->vb.done);
535 }
536
537 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
538 u8 *p_line, u32 length, int field_number)
539 {
540 u32 bytes_to_copy;
541 struct cx231xx_buffer *buf;
542 u32 _line_size = dev->width * 2;
543
544 if (dma_q->current_field == -1) {
545 /* Just starting up */
546 cx231xx_reset_vbi_buffer(dev, dma_q);
547 }
548
549 if (dma_q->current_field != field_number)
550 dma_q->lines_completed = 0;
551
552 /* get the buffer pointer */
553 buf = dev->vbi_mode.bulk_ctl.buf;
554
555 /* Remember the field number for next time */
556 dma_q->current_field = field_number;
557
558 bytes_to_copy = dma_q->bytes_left_in_line;
559 if (bytes_to_copy > length)
560 bytes_to_copy = length;
561
562 if (dma_q->lines_completed >= dma_q->lines_per_field) {
563 dma_q->bytes_left_in_line -= bytes_to_copy;
564 dma_q->is_partial_line =
565 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
566 return 0;
567 }
568
569 dma_q->is_partial_line = 1;
570
571 /* If we don't have a buffer, just return the number of bytes we would
572 have copied if we had a buffer. */
573 if (!buf) {
574 dma_q->bytes_left_in_line -= bytes_to_copy;
575 dma_q->is_partial_line =
576 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
577 return bytes_to_copy;
578 }
579
580 /* copy the data to video buffer */
581 cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
582
583 dma_q->pos += bytes_to_copy;
584 dma_q->bytes_left_in_line -= bytes_to_copy;
585
586 if (dma_q->bytes_left_in_line == 0) {
587
588 dma_q->bytes_left_in_line = _line_size;
589 dma_q->lines_completed++;
590 dma_q->is_partial_line = 0;
591
592 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
593
594 vbi_buffer_filled(dev, dma_q, buf);
595
596 dma_q->pos = 0;
597 dma_q->lines_completed = 0;
598 cx231xx_reset_vbi_buffer(dev, dma_q);
599 }
600 }
601
602 return bytes_to_copy;
603 }
604
605 /*
606 * video-buf generic routine to get the next available buffer
607 */
608 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
609 struct cx231xx_buffer **buf)
610 {
611 struct cx231xx_video_mode *vmode =
612 container_of(dma_q, struct cx231xx_video_mode, vidq);
613 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
614 char *outp;
615
616 if (list_empty(&dma_q->active)) {
617 cx231xx_err("No active queue to serve\n");
618 dev->vbi_mode.bulk_ctl.buf = NULL;
619 *buf = NULL;
620 return;
621 }
622
623 /* Get the next buffer */
624 *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
625
626 /* Cleans up buffer - Useful for testing for frame/URB loss */
627 outp = videobuf_to_vmalloc(&(*buf)->vb);
628 memset(outp, 0, (*buf)->vb.size);
629
630 dev->vbi_mode.bulk_ctl.buf = *buf;
631
632 return;
633 }
634
635 void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
636 struct cx231xx_dmaqueue *dma_q)
637 {
638 struct cx231xx_buffer *buf;
639
640 buf = dev->vbi_mode.bulk_ctl.buf;
641
642 if (buf == NULL) {
643 /* first try to get the buffer */
644 get_next_vbi_buf(dma_q, &buf);
645
646 dma_q->pos = 0;
647 dma_q->current_field = -1;
648 }
649
650 dma_q->bytes_left_in_line = dev->width << 1;
651 dma_q->lines_completed = 0;
652 }
653
654 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
655 u8 *p_buffer, u32 bytes_to_copy)
656 {
657 u8 *p_out_buffer = NULL;
658 u32 current_line_bytes_copied = 0;
659 struct cx231xx_buffer *buf;
660 u32 _line_size = dev->width << 1;
661 void *startwrite;
662 int offset, lencopy;
663
664 buf = dev->vbi_mode.bulk_ctl.buf;
665
666 if (buf == NULL)
667 return -EINVAL;
668
669 p_out_buffer = videobuf_to_vmalloc(&buf->vb);
670
671 if (dma_q->bytes_left_in_line != _line_size) {
672 current_line_bytes_copied =
673 _line_size - dma_q->bytes_left_in_line;
674 }
675
676 offset = (dma_q->lines_completed * _line_size) +
677 current_line_bytes_copied;
678
679 if (dma_q->current_field == 2) {
680 /* Populate the second half of the frame */
681 offset += (dev->width * 2 * dma_q->lines_per_field);
682 }
683
684 /* prepare destination address */
685 startwrite = p_out_buffer + offset;
686
687 lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
688 bytes_to_copy : dma_q->bytes_left_in_line;
689
690 memcpy(startwrite, p_buffer, lencopy);
691
692 return 0;
693 }
694
695 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
696 struct cx231xx_dmaqueue *dma_q)
697 {
698 u32 height = 0;
699
700 height = ((dev->norm & V4L2_STD_625_50) ?
701 PAL_VBI_LINES : NTSC_VBI_LINES);
702 if (dma_q->lines_completed == height && dma_q->current_field == 2)
703 return 1;
704 else
705 return 0;
706 }
Linux with added FPC-III support