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V4L/DVB (10956): cx231xx: First series of manual CodingStyle fixes
[linux-2.6/mini2440.git] / drivers / media / video / cx231xx / cx231xx-vbi.c
blob03059043744c2cf00980a208d74f3782eb5782f1
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/version.h>
30 #include <linux/mm.h>
31 #include <linux/mutex.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
42 static 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 */
84 static 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.isoc_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(p_buffer + bytes_parsed, /* p_buffer */
144 buffer_size - bytes_parsed, /* buffer size */
145 &bytes_used); /* Receives 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); /* buffer size */
155 }
156 }
157
158 /* Save the last four bytes of the buffer so we can check the buffer boundary
159 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 /* call VBI setup if required */
190 /* cx231xx_i2c_call_clients(&dev->i2c_bus[1], VIDIOC_S_FREQUENCY, &f);
191 */
192
193 return 0;
194 }
195
196 /* This is called *without* dev->slock held; please keep it that way */
197 static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
198 {
199 struct cx231xx_fh *fh = vq->priv_data;
200 struct cx231xx *dev = fh->dev;
201 unsigned long flags = 0;
202 if (in_interrupt())
203 BUG();
204
205 /* We used to wait for the buffer to finish here, but this didn't work
206 because, as we were keeping the state as VIDEOBUF_QUEUED,
207 videobuf_queue_cancel marked it as finished for us.
208 (Also, it could wedge forever if the hardware was misconfigured.)
209
210 This should be safe; by the time we get here, the buffer isn't
211 queued anymore. If we ever start marking the buffers as
212 VIDEOBUF_ACTIVE, it won't be, though.
213 */
214 spin_lock_irqsave(&dev->vbi_mode.slock, flags);
215 if (dev->vbi_mode.isoc_ctl.buf == buf)
216 dev->vbi_mode.isoc_ctl.buf = NULL;
217 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
218
219 videobuf_vmalloc_free(&buf->vb);
220 buf->vb.state = VIDEOBUF_NEEDS_INIT;
221 }
222
223 static int
224 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
225 enum v4l2_field field)
226 {
227 struct cx231xx_fh *fh = vq->priv_data;
228 struct cx231xx_buffer *buf =
229 container_of(vb, struct cx231xx_buffer, vb);
230 struct cx231xx *dev = fh->dev;
231 int rc = 0, urb_init = 0;
232 u32 height = 0;
233
234 height = ((dev->norm & V4L2_STD_625_50) ?
235 PAL_VBI_LINES : NTSC_VBI_LINES);
236 buf->vb.size = ((dev->width << 1) * height);
237
238 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
239 return -EINVAL;
240
241 buf->vb.width = dev->width;
242 buf->vb.height = height;
243 buf->vb.field = field;
244 buf->vb.field = V4L2_FIELD_SEQ_TB;
245
246 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
247 rc = videobuf_iolock(vq, &buf->vb, NULL);
248 if (rc < 0)
249 goto fail;
250 }
251
252 if (!dev->vbi_mode.isoc_ctl.num_bufs)
253 urb_init = 1;
254
255 if (urb_init) {
256 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
257 CX231XX_NUM_VBI_BUFS,
258 dev->vbi_mode.alt_max_pkt_size[0],
259 cx231xx_isoc_vbi_copy);
260 if (rc < 0)
261 goto fail;
262 }
263
264 buf->vb.state = VIDEOBUF_PREPARED;
265 return 0;
266
267 fail:
268 free_buffer(vq, buf);
269 return rc;
270 }
271
272 static void
273 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
274 {
275 struct cx231xx_buffer *buf =
276 container_of(vb, struct cx231xx_buffer, vb);
277 struct cx231xx_fh *fh = vq->priv_data;
278 struct cx231xx *dev = fh->dev;
279 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
280
281 buf->vb.state = VIDEOBUF_QUEUED;
282 list_add_tail(&buf->vb.queue, &vidq->active);
283
284 }
285
286 static void vbi_buffer_release(struct videobuf_queue *vq,
287 struct videobuf_buffer *vb)
288 {
289 struct cx231xx_buffer *buf =
290 container_of(vb, struct cx231xx_buffer, vb);
291
292
293 free_buffer(vq, buf);
294 }
295
296 struct videobuf_queue_ops cx231xx_vbi_qops = {
297 .buf_setup = vbi_buffer_setup,
298 .buf_prepare = vbi_buffer_prepare,
299 .buf_queue = vbi_buffer_queue,
300 .buf_release = vbi_buffer_release,
301 };
302
303 /* ------------------------------------------------------------------
304 URB control
305 ------------------------------------------------------------------*/
306
307 /*
308 * IRQ callback, called by URB callback
309 */
310 static void cx231xx_irq_vbi_callback(struct urb *urb)
311 {
312 struct cx231xx_dmaqueue *dma_q = urb->context;
313 struct cx231xx_video_mode *vmode =
314 container_of(dma_q, struct cx231xx_video_mode, vidq);
315 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
316 int rc;
317
318 switch (urb->status) {
319 case 0: /* success */
320 case -ETIMEDOUT: /* NAK */
321 break;
322 case -ECONNRESET: /* kill */
323 case -ENOENT:
324 case -ESHUTDOWN:
325 return;
326 default: /* error */
327 cx231xx_err(DRIVER_NAME "urb completition error %d.\n",
328 urb->status);
329 break;
330 }
331
332 /* Copy data from URB */
333 spin_lock(&dev->vbi_mode.slock);
334 rc = dev->vbi_mode.isoc_ctl.isoc_copy(dev, urb);
335 spin_unlock(&dev->vbi_mode.slock);
336
337 /* Reset status */
338 urb->status = 0;
339
340 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
341 if (urb->status) {
342 cx231xx_err(DRIVER_NAME "urb resubmit failed (error=%i)\n",
343 urb->status);
344 }
345 }
346
347 /*
348 * Stop and Deallocate URBs
349 */
350 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
351 {
352 struct urb *urb;
353 int i;
354
355 cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_uninit_vbi_isoc\n");
356
357 dev->vbi_mode.isoc_ctl.nfields = -1;
358 for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
359 urb = dev->vbi_mode.isoc_ctl.urb[i];
360 if (urb) {
361 if (!irqs_disabled())
362 usb_kill_urb(urb);
363 else
364 usb_unlink_urb(urb);
365
366 if (dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
367
368 kfree(dev->vbi_mode.isoc_ctl.
369 transfer_buffer[i]);
370 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
371 NULL;
372 }
373 usb_free_urb(urb);
374 dev->vbi_mode.isoc_ctl.urb[i] = NULL;
375 }
376 dev->vbi_mode.isoc_ctl.transfer_buffer[i] = NULL;
377 }
378
379 kfree(dev->vbi_mode.isoc_ctl.urb);
380 kfree(dev->vbi_mode.isoc_ctl.transfer_buffer);
381
382 dev->vbi_mode.isoc_ctl.urb = NULL;
383 dev->vbi_mode.isoc_ctl.transfer_buffer = NULL;
384 dev->vbi_mode.isoc_ctl.num_bufs = 0;
385
386 cx231xx_capture_start(dev, 0, Vbi);
387 }
388 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
389
390 /*
391 * Allocate URBs and start IRQ
392 */
393 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
394 int num_bufs, int max_pkt_size,
395 int (*isoc_copy) (struct cx231xx *dev,
396 struct urb *urb))
397 {
398 struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
399 int i;
400 int sb_size, pipe;
401 struct urb *urb;
402 int rc;
403
404 cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_prepare_isoc\n");
405
406 /* De-allocates all pending stuff */
407 cx231xx_uninit_vbi_isoc(dev);
408
409 /* clear if any halt */
410 usb_clear_halt(dev->udev,
411 usb_rcvbulkpipe(dev->udev,
412 dev->vbi_mode.end_point_addr));
413
414 dev->vbi_mode.isoc_ctl.isoc_copy = isoc_copy;
415 dev->vbi_mode.isoc_ctl.num_bufs = num_bufs;
416 dma_q->pos = 0;
417 dma_q->is_partial_line = 0;
418 dma_q->last_sav = 0;
419 dma_q->current_field = -1;
420 dma_q->bytes_left_in_line = dev->width << 1;
421 dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
422 PAL_VBI_LINES : NTSC_VBI_LINES);
423 dma_q->lines_completed = 0;
424 for (i = 0; i < 8; i++)
425 dma_q->partial_buf[i] = 0;
426
427 dev->vbi_mode.isoc_ctl.urb = kzalloc(sizeof(void *) * num_bufs,
428 GFP_KERNEL);
429 if (!dev->vbi_mode.isoc_ctl.urb) {
430 cx231xx_errdev("cannot alloc memory for usb buffers\n");
431 return -ENOMEM;
432 }
433
434 dev->vbi_mode.isoc_ctl.transfer_buffer =
435 kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL);
436 if (!dev->vbi_mode.isoc_ctl.transfer_buffer) {
437 cx231xx_errdev("cannot allocate memory for usbtransfer\n");
438 kfree(dev->vbi_mode.isoc_ctl.urb);
439 return -ENOMEM;
440 }
441
442 dev->vbi_mode.isoc_ctl.max_pkt_size = max_pkt_size;
443 dev->vbi_mode.isoc_ctl.buf = NULL;
444
445 sb_size = max_packets * dev->vbi_mode.isoc_ctl.max_pkt_size;
446
447 /* allocate urbs and transfer buffers */
448 for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
449
450 urb = usb_alloc_urb(0, GFP_KERNEL);
451 if (!urb) {
452 cx231xx_err(DRIVER_NAME
453 ": cannot alloc isoc_ctl.urb %i\n", i);
454 cx231xx_uninit_vbi_isoc(dev);
455 return -ENOMEM;
456 }
457 dev->vbi_mode.isoc_ctl.urb[i] = urb;
458 urb->transfer_flags = 0;
459
460 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
461 kzalloc(sb_size, GFP_KERNEL);
462 if (!dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
463 cx231xx_err(DRIVER_NAME
464 ": unable to allocate %i bytes for transfer"
465 " buffer %i%s\n", sb_size, i,
466 in_interrupt() ? " while in int" : "");
467 cx231xx_uninit_vbi_isoc(dev);
468 return -ENOMEM;
469 }
470
471 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
472 usb_fill_bulk_urb(urb, dev->udev, pipe,
473 dev->vbi_mode.isoc_ctl.transfer_buffer[i],
474 sb_size, cx231xx_irq_vbi_callback, dma_q);
475 }
476
477 init_waitqueue_head(&dma_q->wq);
478
479 /* submit urbs and enables IRQ */
480 for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
481 rc = usb_submit_urb(dev->vbi_mode.isoc_ctl.urb[i], GFP_ATOMIC);
482 if (rc) {
483 cx231xx_err(DRIVER_NAME
484 ": submit of urb %i failed (error=%i)\n", i,
485 rc);
486 cx231xx_uninit_vbi_isoc(dev);
487 return rc;
488 }
489 }
490
491 cx231xx_capture_start(dev, 1, Vbi);
492
493 return 0;
494 }
495 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
496
497 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
498 u8 sav_eav, u8 *p_buffer, u32 buffer_size)
499 {
500 u32 bytes_copied = 0;
501 int current_field = -1;
502
503 switch (sav_eav) {
504
505 case SAV_VBI_FIELD1:
506 current_field = 1;
507 break;
508
509 case SAV_VBI_FIELD2:
510 current_field = 2;
511 break;
512 default:
513 break;
514 }
515
516 if (current_field < 0)
517 return bytes_copied;
518
519 dma_q->last_sav = sav_eav;
520
521 bytes_copied =
522 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
523 current_field);
524
525 return bytes_copied;
526 }
527
528 /*
529 * Announces that a buffer were filled and request the next
530 */
531 static inline void vbi_buffer_filled(struct cx231xx *dev,
532 struct cx231xx_dmaqueue *dma_q,
533 struct cx231xx_buffer *buf)
534 {
535 /* Advice that buffer was filled */
536 /* cx231xx_info(DRIVER_NAME "[%p/%d] wakeup\n", buf, buf->vb.i); */
537
538 buf->vb.state = VIDEOBUF_DONE;
539 buf->vb.field_count++;
540 do_gettimeofday(&buf->vb.ts);
541
542 dev->vbi_mode.isoc_ctl.buf = NULL;
543
544 list_del(&buf->vb.queue);
545 wake_up(&buf->vb.done);
546 }
547
548 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
549 u8 *p_line, u32 length, int field_number)
550 {
551 u32 bytes_to_copy;
552 struct cx231xx_buffer *buf;
553 u32 _line_size = dev->width * 2;
554
555 if (dma_q->current_field != field_number)
556 cx231xx_reset_vbi_buffer(dev, dma_q);
557
558 /* get the buffer pointer */
559 buf = dev->vbi_mode.isoc_ctl.buf;
560
561 /* Remember the field number for next time */
562 dma_q->current_field = field_number;
563
564 bytes_to_copy = dma_q->bytes_left_in_line;
565 if (bytes_to_copy > length)
566 bytes_to_copy = length;
567
568 if (dma_q->lines_completed >= dma_q->lines_per_field) {
569 dma_q->bytes_left_in_line -= bytes_to_copy;
570 dma_q->is_partial_line =
571 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
572 return 0;
573 }
574
575 dma_q->is_partial_line = 1;
576
577 /* If we don't have a buffer, just return the number of bytes we would
578 have copied if we had a buffer. */
579 if (!buf) {
580 dma_q->bytes_left_in_line -= bytes_to_copy;
581 dma_q->is_partial_line =
582 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
583 return bytes_to_copy;
584 }
585
586 /* copy the data to video buffer */
587 cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
588
589 dma_q->pos += bytes_to_copy;
590 dma_q->bytes_left_in_line -= bytes_to_copy;
591
592 if (dma_q->bytes_left_in_line == 0) {
593
594 dma_q->bytes_left_in_line = _line_size;
595 dma_q->lines_completed++;
596 dma_q->is_partial_line = 0;
597
598 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
599
600 vbi_buffer_filled(dev, dma_q, buf);
601
602 dma_q->pos = 0;
603 buf = NULL;
604 dma_q->lines_completed = 0;
605 }
606 }
607
608 return bytes_to_copy;
609 }
610
611 /*
612 * video-buf generic routine to get the next available buffer
613 */
614 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
615 struct cx231xx_buffer **buf)
616 {
617 struct cx231xx_video_mode *vmode =
618 container_of(dma_q, struct cx231xx_video_mode, vidq);
619 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
620 char *outp;
621
622 if (list_empty(&dma_q->active)) {
623 cx231xx_err(DRIVER_NAME ": No active queue to serve\n");
624 dev->vbi_mode.isoc_ctl.buf = NULL;
625 *buf = NULL;
626 return;
627 }
628
629 /* Get the next buffer */
630 *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
631
632 /* Cleans up buffer - Usefull for testing for frame/URB loss */
633 outp = videobuf_to_vmalloc(&(*buf)->vb);
634 memset(outp, 0, (*buf)->vb.size);
635
636 dev->vbi_mode.isoc_ctl.buf = *buf;
637
638 return;
639 }
640
641 void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
642 struct cx231xx_dmaqueue *dma_q)
643 {
644 struct cx231xx_buffer *buf;
645
646 buf = dev->vbi_mode.isoc_ctl.buf;
647
648 if (buf == NULL) {
649 /* first try to get the buffer */
650 get_next_vbi_buf(dma_q, &buf);
651
652 dma_q->pos = 0;
653 dma_q->current_field = -1;
654 }
655
656 dma_q->bytes_left_in_line = dev->width << 1;
657 dma_q->lines_completed = 0;
658 }
659
660 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
661 u8 *p_buffer, u32 bytes_to_copy)
662 {
663 u8 *p_out_buffer = NULL;
664 u32 current_line_bytes_copied = 0;
665 struct cx231xx_buffer *buf;
666 u32 _line_size = dev->width << 1;
667 void *startwrite;
668 int offset, lencopy;
669
670 buf = dev->vbi_mode.isoc_ctl.buf;
671
672 if (buf == NULL)
673 return -EINVAL;
674
675 p_out_buffer = videobuf_to_vmalloc(&buf->vb);
676
677 if (dma_q->bytes_left_in_line != _line_size) {
678 current_line_bytes_copied =
679 _line_size - dma_q->bytes_left_in_line;
680 }
681
682 offset = (dma_q->lines_completed * _line_size) +
683 current_line_bytes_copied;
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 return (dma_q->lines_completed == height) ? 1 : 0;
704 }
Support for the Chinese Samsung S3C2440 based development boards