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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / media / video / cx231xx / cx231xx-vbi.c
blobe97b8023a6557a8fe15c39c921b0c36038733730
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
32 #include <media/v4l2-common.h>
33 #include <media/v4l2-ioctl.h>
34 #include <media/v4l2-chip-ident.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(DRIVER_NAME "URB status %d [%s].\n", status,
73 errmsg);
74 } else {
75 cx231xx_err(DRIVER_NAME "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_buffer *buf;
86 struct cx231xx_dmaqueue *dma_q = urb->context;
87 int rc = 1;
88 unsigned char *p_buffer;
89 u32 bytes_parsed = 0, buffer_size = 0;
90 u8 sav_eav = 0;
91
92 if (!dev)
93 return 0;
94
95 if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
96 return 0;
97
98 if (urb->status < 0) {
99 print_err_status(dev, -1, urb->status);
100 if (urb->status == -ENOENT)
101 return 0;
102 }
103
104 buf = dev->vbi_mode.isoc_ctl.buf;
105
106 /* get buffer pointer and length */
107 p_buffer = urb->transfer_buffer;
108 buffer_size = urb->actual_length;
109
110 if (buffer_size > 0) {
111 bytes_parsed = 0;
112
113 if (dma_q->is_partial_line) {
114 /* Handle the case where we were working on a partial
115 line */
116 sav_eav = dma_q->last_sav;
117 } else {
118 /* Check for a SAV/EAV overlapping the
119 buffer boundary */
120
121 sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer,
122 dma_q->partial_buf,
123 &bytes_parsed);
124 }
125
126 sav_eav &= 0xF0;
127 /* Get the first line if we have some portion of an SAV/EAV from
128 the last buffer or a partial line */
129 if (sav_eav) {
130 bytes_parsed += cx231xx_get_vbi_line(dev, dma_q,
131 sav_eav, /* SAV/EAV */
132 p_buffer + bytes_parsed, /* p_buffer */
133 buffer_size - bytes_parsed); /* buffer size */
134 }
135
136 /* Now parse data that is completely in this buffer */
137 dma_q->is_partial_line = 0;
138
139 while (bytes_parsed < buffer_size) {
140 u32 bytes_used = 0;
141
142 sav_eav = cx231xx_find_next_SAV_EAV(
143 p_buffer + bytes_parsed, /* p_buffer */
144 buffer_size - bytes_parsed, /* buffer size */
145 &bytes_used); /* bytes used to get SAV/EAV */
146
147 bytes_parsed += bytes_used;
148
149 sav_eav &= 0xF0;
150 if (sav_eav && (bytes_parsed < buffer_size)) {
151 bytes_parsed += cx231xx_get_vbi_line(dev,
152 dma_q, sav_eav, /* SAV/EAV */
153 p_buffer+bytes_parsed, /* p_buffer */
154 buffer_size-bytes_parsed);/*buf size*/
155 }
156 }
157
158 /* Save the last four bytes of the buffer so we can
159 check the buffer boundary condition next time */
160 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4);
161 bytes_parsed = 0;
162 }
163
164 return rc;
165 }
166
167 /* ------------------------------------------------------------------
168 Vbi buf operations
169 ------------------------------------------------------------------*/
170
171 static int
172 vbi_buffer_setup(struct videobuf_queue *vq, unsigned int *count,
173 unsigned int *size)
174 {
175 struct cx231xx_fh *fh = vq->priv_data;
176 struct cx231xx *dev = fh->dev;
177 u32 height = 0;
178
179 height = ((dev->norm & V4L2_STD_625_50) ?
180 PAL_VBI_LINES : NTSC_VBI_LINES);
181
182 *size = (dev->width * height * 2);
183 if (0 == *count)
184 *count = CX231XX_DEF_VBI_BUF;
185
186 if (*count < CX231XX_MIN_BUF)
187 *count = CX231XX_MIN_BUF;
188
189 return 0;
190 }
191
192 /* This is called *without* dev->slock held; please keep it that way */
193 static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
194 {
195 struct cx231xx_fh *fh = vq->priv_data;
196 struct cx231xx *dev = fh->dev;
197 unsigned long flags = 0;
198 if (in_interrupt())
199 BUG();
200
201 /* We used to wait for the buffer to finish here, but this didn't work
202 because, as we were keeping the state as VIDEOBUF_QUEUED,
203 videobuf_queue_cancel marked it as finished for us.
204 (Also, it could wedge forever if the hardware was misconfigured.)
205
206 This should be safe; by the time we get here, the buffer isn't
207 queued anymore. If we ever start marking the buffers as
208 VIDEOBUF_ACTIVE, it won't be, though.
209 */
210 spin_lock_irqsave(&dev->vbi_mode.slock, flags);
211 if (dev->vbi_mode.isoc_ctl.buf == buf)
212 dev->vbi_mode.isoc_ctl.buf = NULL;
213 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
214
215 videobuf_vmalloc_free(&buf->vb);
216 buf->vb.state = VIDEOBUF_NEEDS_INIT;
217 }
218
219 static int
220 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
221 enum v4l2_field field)
222 {
223 struct cx231xx_fh *fh = vq->priv_data;
224 struct cx231xx_buffer *buf =
225 container_of(vb, struct cx231xx_buffer, vb);
226 struct cx231xx *dev = fh->dev;
227 int rc = 0, urb_init = 0;
228 u32 height = 0;
229
230 height = ((dev->norm & V4L2_STD_625_50) ?
231 PAL_VBI_LINES : NTSC_VBI_LINES);
232 buf->vb.size = ((dev->width << 1) * height);
233
234 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
235 return -EINVAL;
236
237 buf->vb.width = dev->width;
238 buf->vb.height = height;
239 buf->vb.field = field;
240 buf->vb.field = V4L2_FIELD_SEQ_TB;
241
242 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
243 rc = videobuf_iolock(vq, &buf->vb, NULL);
244 if (rc < 0)
245 goto fail;
246 }
247
248 if (!dev->vbi_mode.isoc_ctl.num_bufs)
249 urb_init = 1;
250
251 if (urb_init) {
252 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
253 CX231XX_NUM_VBI_BUFS,
254 dev->vbi_mode.alt_max_pkt_size[0],
255 cx231xx_isoc_vbi_copy);
256 if (rc < 0)
257 goto fail;
258 }
259
260 buf->vb.state = VIDEOBUF_PREPARED;
261 return 0;
262
263 fail:
264 free_buffer(vq, buf);
265 return rc;
266 }
267
268 static void
269 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
270 {
271 struct cx231xx_buffer *buf =
272 container_of(vb, struct cx231xx_buffer, vb);
273 struct cx231xx_fh *fh = vq->priv_data;
274 struct cx231xx *dev = fh->dev;
275 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
276
277 buf->vb.state = VIDEOBUF_QUEUED;
278 list_add_tail(&buf->vb.queue, &vidq->active);
279
280 }
281
282 static void vbi_buffer_release(struct videobuf_queue *vq,
283 struct videobuf_buffer *vb)
284 {
285 struct cx231xx_buffer *buf =
286 container_of(vb, struct cx231xx_buffer, vb);
287
288
289 free_buffer(vq, buf);
290 }
291
292 struct videobuf_queue_ops cx231xx_vbi_qops = {
293 .buf_setup = vbi_buffer_setup,
294 .buf_prepare = vbi_buffer_prepare,
295 .buf_queue = vbi_buffer_queue,
296 .buf_release = vbi_buffer_release,
297 };
298
299 /* ------------------------------------------------------------------
300 URB control
301 ------------------------------------------------------------------*/
302
303 /*
304 * IRQ callback, called by URB callback
305 */
306 static void cx231xx_irq_vbi_callback(struct urb *urb)
307 {
308 struct cx231xx_dmaqueue *dma_q = urb->context;
309 struct cx231xx_video_mode *vmode =
310 container_of(dma_q, struct cx231xx_video_mode, vidq);
311 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
312 int rc;
313
314 switch (urb->status) {
315 case 0: /* success */
316 case -ETIMEDOUT: /* NAK */
317 break;
318 case -ECONNRESET: /* kill */
319 case -ENOENT:
320 case -ESHUTDOWN:
321 return;
322 default: /* error */
323 cx231xx_err(DRIVER_NAME "urb completition error %d.\n",
324 urb->status);
325 break;
326 }
327
328 /* Copy data from URB */
329 spin_lock(&dev->vbi_mode.slock);
330 rc = dev->vbi_mode.isoc_ctl.isoc_copy(dev, urb);
331 spin_unlock(&dev->vbi_mode.slock);
332
333 /* Reset status */
334 urb->status = 0;
335
336 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
337 if (urb->status) {
338 cx231xx_err(DRIVER_NAME "urb resubmit failed (error=%i)\n",
339 urb->status);
340 }
341 }
342
343 /*
344 * Stop and Deallocate URBs
345 */
346 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
347 {
348 struct urb *urb;
349 int i;
350
351 cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_uninit_vbi_isoc\n");
352
353 dev->vbi_mode.isoc_ctl.nfields = -1;
354 for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
355 urb = dev->vbi_mode.isoc_ctl.urb[i];
356 if (urb) {
357 if (!irqs_disabled())
358 usb_kill_urb(urb);
359 else
360 usb_unlink_urb(urb);
361
362 if (dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
363
364 kfree(dev->vbi_mode.isoc_ctl.
365 transfer_buffer[i]);
366 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
367 NULL;
368 }
369 usb_free_urb(urb);
370 dev->vbi_mode.isoc_ctl.urb[i] = NULL;
371 }
372 dev->vbi_mode.isoc_ctl.transfer_buffer[i] = NULL;
373 }
374
375 kfree(dev->vbi_mode.isoc_ctl.urb);
376 kfree(dev->vbi_mode.isoc_ctl.transfer_buffer);
377
378 dev->vbi_mode.isoc_ctl.urb = NULL;
379 dev->vbi_mode.isoc_ctl.transfer_buffer = NULL;
380 dev->vbi_mode.isoc_ctl.num_bufs = 0;
381
382 cx231xx_capture_start(dev, 0, Vbi);
383 }
384 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
385
386 /*
387 * Allocate URBs and start IRQ
388 */
389 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
390 int num_bufs, int max_pkt_size,
391 int (*isoc_copy) (struct cx231xx *dev,
392 struct urb *urb))
393 {
394 struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
395 int i;
396 int sb_size, pipe;
397 struct urb *urb;
398 int rc;
399
400 cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_prepare_isoc\n");
401
402 /* De-allocates all pending stuff */
403 cx231xx_uninit_vbi_isoc(dev);
404
405 /* clear if any halt */
406 usb_clear_halt(dev->udev,
407 usb_rcvbulkpipe(dev->udev,
408 dev->vbi_mode.end_point_addr));
409
410 dev->vbi_mode.isoc_ctl.isoc_copy = isoc_copy;
411 dev->vbi_mode.isoc_ctl.num_bufs = num_bufs;
412 dma_q->pos = 0;
413 dma_q->is_partial_line = 0;
414 dma_q->last_sav = 0;
415 dma_q->current_field = -1;
416 dma_q->bytes_left_in_line = dev->width << 1;
417 dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
418 PAL_VBI_LINES : NTSC_VBI_LINES);
419 dma_q->lines_completed = 0;
420 for (i = 0; i < 8; i++)
421 dma_q->partial_buf[i] = 0;
422
423 dev->vbi_mode.isoc_ctl.urb = kzalloc(sizeof(void *) * num_bufs,
424 GFP_KERNEL);
425 if (!dev->vbi_mode.isoc_ctl.urb) {
426 cx231xx_errdev("cannot alloc memory for usb buffers\n");
427 return -ENOMEM;
428 }
429
430 dev->vbi_mode.isoc_ctl.transfer_buffer =
431 kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL);
432 if (!dev->vbi_mode.isoc_ctl.transfer_buffer) {
433 cx231xx_errdev("cannot allocate memory for usbtransfer\n");
434 kfree(dev->vbi_mode.isoc_ctl.urb);
435 return -ENOMEM;
436 }
437
438 dev->vbi_mode.isoc_ctl.max_pkt_size = max_pkt_size;
439 dev->vbi_mode.isoc_ctl.buf = NULL;
440
441 sb_size = max_packets * dev->vbi_mode.isoc_ctl.max_pkt_size;
442
443 /* allocate urbs and transfer buffers */
444 for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
445
446 urb = usb_alloc_urb(0, GFP_KERNEL);
447 if (!urb) {
448 cx231xx_err(DRIVER_NAME
449 ": cannot alloc isoc_ctl.urb %i\n", i);
450 cx231xx_uninit_vbi_isoc(dev);
451 return -ENOMEM;
452 }
453 dev->vbi_mode.isoc_ctl.urb[i] = urb;
454 urb->transfer_flags = 0;
455
456 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
457 kzalloc(sb_size, GFP_KERNEL);
458 if (!dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
459 cx231xx_err(DRIVER_NAME
460 ": unable to allocate %i bytes for transfer"
461 " buffer %i%s\n", sb_size, i,
462 in_interrupt() ? " while in int" : "");
463 cx231xx_uninit_vbi_isoc(dev);
464 return -ENOMEM;
465 }
466
467 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
468 usb_fill_bulk_urb(urb, dev->udev, pipe,
469 dev->vbi_mode.isoc_ctl.transfer_buffer[i],
470 sb_size, cx231xx_irq_vbi_callback, dma_q);
471 }
472
473 init_waitqueue_head(&dma_q->wq);
474
475 /* submit urbs and enables IRQ */
476 for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
477 rc = usb_submit_urb(dev->vbi_mode.isoc_ctl.urb[i], GFP_ATOMIC);
478 if (rc) {
479 cx231xx_err(DRIVER_NAME
480 ": submit of urb %i failed (error=%i)\n", i,
481 rc);
482 cx231xx_uninit_vbi_isoc(dev);
483 return rc;
484 }
485 }
486
487 cx231xx_capture_start(dev, 1, Vbi);
488
489 return 0;
490 }
491 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
492
493 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
494 u8 sav_eav, u8 *p_buffer, u32 buffer_size)
495 {
496 u32 bytes_copied = 0;
497 int current_field = -1;
498
499 switch (sav_eav) {
500
501 case SAV_VBI_FIELD1:
502 current_field = 1;
503 break;
504
505 case SAV_VBI_FIELD2:
506 current_field = 2;
507 break;
508 default:
509 break;
510 }
511
512 if (current_field < 0)
513 return bytes_copied;
514
515 dma_q->last_sav = sav_eav;
516
517 bytes_copied =
518 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
519 current_field);
520
521 return bytes_copied;
522 }
523
524 /*
525 * Announces that a buffer were filled and request the next
526 */
527 static inline void vbi_buffer_filled(struct cx231xx *dev,
528 struct cx231xx_dmaqueue *dma_q,
529 struct cx231xx_buffer *buf)
530 {
531 /* Advice that buffer was filled */
532 /* cx231xx_info(DRIVER_NAME "[%p/%d] wakeup\n", buf, buf->vb.i); */
533
534 buf->vb.state = VIDEOBUF_DONE;
535 buf->vb.field_count++;
536 do_gettimeofday(&buf->vb.ts);
537
538 dev->vbi_mode.isoc_ctl.buf = NULL;
539
540 list_del(&buf->vb.queue);
541 wake_up(&buf->vb.done);
542 }
543
544 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
545 u8 *p_line, u32 length, int field_number)
546 {
547 u32 bytes_to_copy;
548 struct cx231xx_buffer *buf;
549 u32 _line_size = dev->width * 2;
550
551 if (dma_q->current_field != field_number)
552 cx231xx_reset_vbi_buffer(dev, dma_q);
553
554 /* get the buffer pointer */
555 buf = dev->vbi_mode.isoc_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 buf = NULL;
600 dma_q->lines_completed = 0;
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 cx231xx_err(DRIVER_NAME ": No active queue to serve\n");
620 dev->vbi_mode.isoc_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 - Usefull 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.isoc_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.isoc_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.isoc_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 /* prepare destination address */
682 startwrite = p_out_buffer + offset;
683
684 lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
685 bytes_to_copy : dma_q->bytes_left_in_line;
686
687 memcpy(startwrite, p_buffer, lencopy);
688
689 return 0;
690 }
691
692 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
693 struct cx231xx_dmaqueue *dma_q)
694 {
695 u32 height = 0;
696
697 height = ((dev->norm & V4L2_STD_625_50) ?
698 PAL_VBI_LINES : NTSC_VBI_LINES);
699 return (dma_q->lines_completed == height) ? 1 : 0;
700 }