1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 cx231xx_vbi.c - driver for Conexant Cx23100/101/102 USB video capture devices
4
5 Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
6 Based on cx88 driver
7
8 */
9
10 #include "cx231xx.h"
11 #include <linux/init.h>
12 #include <linux/list.h>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/bitmap.h>
16 #include <linux/i2c.h>
17 #include <linux/mm.h>
18 #include <linux/mutex.h>
19 #include <linux/slab.h>
20
21 #include <media/v4l2-common.h>
22 #include <media/v4l2-ioctl.h>
23 #include <media/drv-intf/msp3400.h>
24 #include <media/tuner.h>
25
26 #include "cx231xx-vbi.h"
27
print_err_status(struct cx231xx * dev,int packet,int status)28 static inline void print_err_status(struct cx231xx *dev, int packet, int status)
29 {
30 char *errmsg = "Unknown";
31
32 switch (status) {
33 case -ENOENT:
34 errmsg = "unlinked synchronously";
35 break;
36 case -ECONNRESET:
37 errmsg = "unlinked asynchronously";
38 break;
39 case -ENOSR:
40 errmsg = "Buffer error (overrun)";
41 break;
42 case -EPIPE:
43 errmsg = "Stalled (device not responding)";
44 break;
45 case -EOVERFLOW:
46 errmsg = "Babble (bad cable?)";
47 break;
48 case -EPROTO:
49 errmsg = "Bit-stuff error (bad cable?)";
50 break;
51 case -EILSEQ:
52 errmsg = "CRC/Timeout (could be anything)";
53 break;
54 case -ETIME:
55 errmsg = "Device does not respond";
56 break;
57 }
58 if (packet < 0) {
59 dev_err(dev->dev,
60 "URB status %d [%s].\n", status, errmsg);
61 } else {
62 dev_err(dev->dev,
63 "URB packet %d, status %d [%s].\n",
64 packet, status, errmsg);
65 }
66 }
67
68 /*
69 * Controls the isoc copy of each urb packet
70 */
cx231xx_isoc_vbi_copy(struct cx231xx * dev,struct urb * urb)71 static inline int cx231xx_isoc_vbi_copy(struct cx231xx *dev, struct urb *urb)
72 {
73 struct cx231xx_dmaqueue *dma_q = urb->context;
74 int rc = 1;
75 unsigned char *p_buffer;
76 u32 bytes_parsed = 0, buffer_size = 0;
77 u8 sav_eav = 0;
78
79 if (!dev)
80 return 0;
81
82 if (dev->state & DEV_DISCONNECTED)
83 return 0;
84
85 if (urb->status < 0) {
86 print_err_status(dev, -1, urb->status);
87 if (urb->status == -ENOENT)
88 return 0;
89 }
90
91 /* get buffer pointer and length */
92 p_buffer = urb->transfer_buffer;
93 buffer_size = urb->actual_length;
94
95 if (buffer_size > 0) {
96 bytes_parsed = 0;
97
98 if (dma_q->is_partial_line) {
99 /* Handle the case where we were working on a partial
100 line */
101 sav_eav = dma_q->last_sav;
102 } else {
103 /* Check for a SAV/EAV overlapping the
104 buffer boundary */
105
106 sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer,
107 dma_q->partial_buf,
108 &bytes_parsed);
109 }
110
111 sav_eav &= 0xF0;
112 /* Get the first line if we have some portion of an SAV/EAV from
113 the last buffer or a partial line */
114 if (sav_eav) {
115 bytes_parsed += cx231xx_get_vbi_line(dev, dma_q,
116 sav_eav, /* SAV/EAV */
117 p_buffer + bytes_parsed, /* p_buffer */
118 buffer_size - bytes_parsed); /* buffer size */
119 }
120
121 /* Now parse data that is completely in this buffer */
122 dma_q->is_partial_line = 0;
123
124 while (bytes_parsed < buffer_size) {
125 u32 bytes_used = 0;
126
127 sav_eav = cx231xx_find_next_SAV_EAV(
128 p_buffer + bytes_parsed, /* p_buffer */
129 buffer_size - bytes_parsed, /* buffer size */
130 &bytes_used); /* bytes used to get SAV/EAV */
131
132 bytes_parsed += bytes_used;
133
134 sav_eav &= 0xF0;
135 if (sav_eav && (bytes_parsed < buffer_size)) {
136 bytes_parsed += cx231xx_get_vbi_line(dev,
137 dma_q, sav_eav, /* SAV/EAV */
138 p_buffer+bytes_parsed, /* p_buffer */
139 buffer_size-bytes_parsed);/*buf size*/
140 }
141 }
142
143 /* Save the last four bytes of the buffer so we can
144 check the buffer boundary condition next time */
145 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4);
146 bytes_parsed = 0;
147 }
148
149 return rc;
150 }
151
152 /* ------------------------------------------------------------------
153 Vbi buf operations
154 ------------------------------------------------------------------*/
155
vbi_queue_setup(struct vb2_queue * vq,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])156 static int vbi_queue_setup(struct vb2_queue *vq,
157 unsigned int *nbuffers, unsigned int *nplanes,
158 unsigned int sizes[], struct device *alloc_devs[])
159 {
160 struct cx231xx *dev = vb2_get_drv_priv(vq);
161 u32 height = 0;
162
163 height = ((dev->norm & V4L2_STD_625_50) ?
164 PAL_VBI_LINES : NTSC_VBI_LINES);
165
166 *nplanes = 1;
167 sizes[0] = (dev->width * height * 2 * 2);
168 return 0;
169 }
170
171 /* This is called *without* dev->slock held; please keep it that way */
vbi_buf_prepare(struct vb2_buffer * vb)172 static int vbi_buf_prepare(struct vb2_buffer *vb)
173 {
174 struct cx231xx *dev = vb2_get_drv_priv(vb->vb2_queue);
175 u32 height = 0;
176 u32 size;
177
178 height = ((dev->norm & V4L2_STD_625_50) ?
179 PAL_VBI_LINES : NTSC_VBI_LINES);
180 size = ((dev->width << 1) * height * 2);
181
182 if (vb2_plane_size(vb, 0) < size)
183 return -EINVAL;
184 vb2_set_plane_payload(vb, 0, size);
185 return 0;
186 }
187
vbi_buf_queue(struct vb2_buffer * vb)188 static void vbi_buf_queue(struct vb2_buffer *vb)
189 {
190 struct cx231xx *dev = vb2_get_drv_priv(vb->vb2_queue);
191 struct cx231xx_buffer *buf =
192 container_of(vb, struct cx231xx_buffer, vb.vb2_buf);
193 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
194 unsigned long flags;
195
196 spin_lock_irqsave(&dev->vbi_mode.slock, flags);
197 list_add_tail(&buf->list, &vidq->active);
198 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
199 }
200
return_all_buffers(struct cx231xx * dev,enum vb2_buffer_state state)201 static void return_all_buffers(struct cx231xx *dev,
202 enum vb2_buffer_state state)
203 {
204 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
205 struct cx231xx_buffer *buf, *node;
206 unsigned long flags;
207
208 spin_lock_irqsave(&dev->vbi_mode.slock, flags);
209 dev->vbi_mode.bulk_ctl.buf = NULL;
210 list_for_each_entry_safe(buf, node, &vidq->active, list) {
211 list_del(&buf->list);
212 vb2_buffer_done(&buf->vb.vb2_buf, state);
213 }
214 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
215 }
216
vbi_start_streaming(struct vb2_queue * vq,unsigned int count)217 static int vbi_start_streaming(struct vb2_queue *vq, unsigned int count)
218 {
219 struct cx231xx *dev = vb2_get_drv_priv(vq);
220 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
221 int ret;
222
223 vidq->sequence = 0;
224 ret = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
225 CX231XX_NUM_VBI_BUFS,
226 dev->vbi_mode.alt_max_pkt_size[0],
227 cx231xx_isoc_vbi_copy);
228 if (ret)
229 return_all_buffers(dev, VB2_BUF_STATE_QUEUED);
230 return ret;
231 }
232
vbi_stop_streaming(struct vb2_queue * vq)233 static void vbi_stop_streaming(struct vb2_queue *vq)
234 {
235 struct cx231xx *dev = vb2_get_drv_priv(vq);
236
237 return_all_buffers(dev, VB2_BUF_STATE_ERROR);
238 }
239
240 struct vb2_ops cx231xx_vbi_qops = {
241 .queue_setup = vbi_queue_setup,
242 .buf_prepare = vbi_buf_prepare,
243 .buf_queue = vbi_buf_queue,
244 .start_streaming = vbi_start_streaming,
245 .stop_streaming = vbi_stop_streaming,
246 .wait_prepare = vb2_ops_wait_prepare,
247 .wait_finish = vb2_ops_wait_finish,
248 };
249
250 /* ------------------------------------------------------------------
251 URB control
252 ------------------------------------------------------------------*/
253
254 /*
255 * IRQ callback, called by URB callback
256 */
cx231xx_irq_vbi_callback(struct urb * urb)257 static void cx231xx_irq_vbi_callback(struct urb *urb)
258 {
259 struct cx231xx_dmaqueue *dma_q = urb->context;
260 struct cx231xx_video_mode *vmode =
261 container_of(dma_q, struct cx231xx_video_mode, vidq);
262 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
263 unsigned long flags;
264
265 switch (urb->status) {
266 case 0: /* success */
267 case -ETIMEDOUT: /* NAK */
268 break;
269 case -ECONNRESET: /* kill */
270 case -ENOENT:
271 case -ESHUTDOWN:
272 return;
273 default: /* error */
274 dev_err(dev->dev,
275 "urb completion error %d.\n", urb->status);
276 break;
277 }
278
279 /* Copy data from URB */
280 spin_lock_irqsave(&dev->vbi_mode.slock, flags);
281 dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb);
282 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
283
284 /* Reset status */
285 urb->status = 0;
286
287 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
288 if (urb->status) {
289 dev_err(dev->dev, "urb resubmit failed (error=%i)\n",
290 urb->status);
291 }
292 }
293
294 /*
295 * Stop and Deallocate URBs
296 */
cx231xx_uninit_vbi_isoc(struct cx231xx * dev)297 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
298 {
299 struct urb *urb;
300 int i;
301
302 dev_dbg(dev->dev, "called cx231xx_uninit_vbi_isoc\n");
303
304 dev->vbi_mode.bulk_ctl.nfields = -1;
305 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
306 urb = dev->vbi_mode.bulk_ctl.urb[i];
307 if (urb) {
308 if (!irqs_disabled())
309 usb_kill_urb(urb);
310 else
311 usb_unlink_urb(urb);
312
313 if (dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
314
315 kfree(dev->vbi_mode.bulk_ctl.
316 transfer_buffer[i]);
317 dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
318 NULL;
319 }
320 usb_free_urb(urb);
321 dev->vbi_mode.bulk_ctl.urb[i] = NULL;
322 }
323 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = NULL;
324 }
325
326 kfree(dev->vbi_mode.bulk_ctl.urb);
327 kfree(dev->vbi_mode.bulk_ctl.transfer_buffer);
328
329 dev->vbi_mode.bulk_ctl.urb = NULL;
330 dev->vbi_mode.bulk_ctl.transfer_buffer = NULL;
331 dev->vbi_mode.bulk_ctl.num_bufs = 0;
332
333 cx231xx_capture_start(dev, 0, Vbi);
334 }
335 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
336
337 /*
338 * Allocate URBs and start IRQ
339 */
cx231xx_init_vbi_isoc(struct cx231xx * dev,int max_packets,int num_bufs,int max_pkt_size,int (* bulk_copy)(struct cx231xx * dev,struct urb * urb))340 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
341 int num_bufs, int max_pkt_size,
342 int (*bulk_copy) (struct cx231xx *dev,
343 struct urb *urb))
344 {
345 struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
346 int i;
347 int sb_size, pipe;
348 struct urb *urb;
349 int rc;
350
351 dev_dbg(dev->dev, "called cx231xx_vbi_isoc\n");
352
353 /* De-allocates all pending stuff */
354 cx231xx_uninit_vbi_isoc(dev);
355
356 /* clear if any halt */
357 usb_clear_halt(dev->udev,
358 usb_rcvbulkpipe(dev->udev,
359 dev->vbi_mode.end_point_addr));
360
361 dev->vbi_mode.bulk_ctl.bulk_copy = bulk_copy;
362 dev->vbi_mode.bulk_ctl.num_bufs = num_bufs;
363 dma_q->pos = 0;
364 dma_q->is_partial_line = 0;
365 dma_q->last_sav = 0;
366 dma_q->current_field = -1;
367 dma_q->bytes_left_in_line = dev->width << 1;
368 dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
369 PAL_VBI_LINES : NTSC_VBI_LINES);
370 dma_q->lines_completed = 0;
371 for (i = 0; i < 8; i++)
372 dma_q->partial_buf[i] = 0;
373
374 dev->vbi_mode.bulk_ctl.urb = kcalloc(num_bufs, sizeof(void *),
375 GFP_KERNEL);
376 if (!dev->vbi_mode.bulk_ctl.urb) {
377 dev_err(dev->dev,
378 "cannot alloc memory for usb buffers\n");
379 return -ENOMEM;
380 }
381
382 dev->vbi_mode.bulk_ctl.transfer_buffer =
383 kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
384 if (!dev->vbi_mode.bulk_ctl.transfer_buffer) {
385 dev_err(dev->dev,
386 "cannot allocate memory for usbtransfer\n");
387 kfree(dev->vbi_mode.bulk_ctl.urb);
388 return -ENOMEM;
389 }
390
391 dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size;
392 dev->vbi_mode.bulk_ctl.buf = NULL;
393
394 sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size;
395
396 /* allocate urbs and transfer buffers */
397 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
398
399 urb = usb_alloc_urb(0, GFP_KERNEL);
400 if (!urb) {
401 cx231xx_uninit_vbi_isoc(dev);
402 return -ENOMEM;
403 }
404 dev->vbi_mode.bulk_ctl.urb[i] = urb;
405 urb->transfer_flags = 0;
406
407 dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
408 kzalloc(sb_size, GFP_KERNEL);
409 if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
410 dev_err(dev->dev,
411 "unable to allocate %i bytes for transfer buffer %i\n",
412 sb_size, i);
413 cx231xx_uninit_vbi_isoc(dev);
414 return -ENOMEM;
415 }
416
417 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
418 usb_fill_bulk_urb(urb, dev->udev, pipe,
419 dev->vbi_mode.bulk_ctl.transfer_buffer[i],
420 sb_size, cx231xx_irq_vbi_callback, dma_q);
421 }
422
423 init_waitqueue_head(&dma_q->wq);
424
425 /* submit urbs and enables IRQ */
426 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
427 rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC);
428 if (rc) {
429 dev_err(dev->dev,
430 "submit of urb %i failed (error=%i)\n", i, rc);
431 cx231xx_uninit_vbi_isoc(dev);
432 return rc;
433 }
434 }
435
436 cx231xx_capture_start(dev, 1, Vbi);
437
438 return 0;
439 }
440 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
441
cx231xx_get_vbi_line(struct cx231xx * dev,struct cx231xx_dmaqueue * dma_q,u8 sav_eav,u8 * p_buffer,u32 buffer_size)442 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
443 u8 sav_eav, u8 *p_buffer, u32 buffer_size)
444 {
445 u32 bytes_copied = 0;
446 int current_field = -1;
447
448 switch (sav_eav) {
449
450 case SAV_VBI_FIELD1:
451 current_field = 1;
452 break;
453
454 case SAV_VBI_FIELD2:
455 current_field = 2;
456 break;
457 default:
458 break;
459 }
460
461 if (current_field < 0)
462 return bytes_copied;
463
464 dma_q->last_sav = sav_eav;
465
466 bytes_copied =
467 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
468 current_field);
469
470 return bytes_copied;
471 }
472
473 /*
474 * Announces that a buffer were filled and request the next
475 */
vbi_buffer_filled(struct cx231xx * dev,struct cx231xx_dmaqueue * dma_q,struct cx231xx_buffer * buf)476 static inline void vbi_buffer_filled(struct cx231xx *dev,
477 struct cx231xx_dmaqueue *dma_q,
478 struct cx231xx_buffer *buf)
479 {
480 /* Advice that buffer was filled */
481 /* dev_dbg(dev->dev, "[%p/%d] wakeup\n", buf, buf->vb.index); */
482
483 buf->vb.sequence = dma_q->sequence++;
484 buf->vb.vb2_buf.timestamp = ktime_get_ns();
485
486 dev->vbi_mode.bulk_ctl.buf = NULL;
487
488 list_del(&buf->list);
489 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
490 }
491
cx231xx_copy_vbi_line(struct cx231xx * dev,struct cx231xx_dmaqueue * dma_q,u8 * p_line,u32 length,int field_number)492 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
493 u8 *p_line, u32 length, int field_number)
494 {
495 u32 bytes_to_copy;
496 struct cx231xx_buffer *buf;
497 u32 _line_size = dev->width * 2;
498
499 if (dma_q->current_field == -1) {
500 /* Just starting up */
501 cx231xx_reset_vbi_buffer(dev, dma_q);
502 }
503
504 if (dma_q->current_field != field_number)
505 dma_q->lines_completed = 0;
506
507 /* get the buffer pointer */
508 buf = dev->vbi_mode.bulk_ctl.buf;
509
510 /* Remember the field number for next time */
511 dma_q->current_field = field_number;
512
513 bytes_to_copy = dma_q->bytes_left_in_line;
514 if (bytes_to_copy > length)
515 bytes_to_copy = length;
516
517 if (dma_q->lines_completed >= dma_q->lines_per_field) {
518 dma_q->bytes_left_in_line -= bytes_to_copy;
519 dma_q->is_partial_line =
520 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
521 return 0;
522 }
523
524 dma_q->is_partial_line = 1;
525
526 /* If we don't have a buffer, just return the number of bytes we would
527 have copied if we had a buffer. */
528 if (!buf) {
529 dma_q->bytes_left_in_line -= bytes_to_copy;
530 dma_q->is_partial_line =
531 (dma_q->bytes_left_in_line == 0) ? 0 : 1;
532 return bytes_to_copy;
533 }
534
535 /* copy the data to video buffer */
536 cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
537
538 dma_q->pos += bytes_to_copy;
539 dma_q->bytes_left_in_line -= bytes_to_copy;
540
541 if (dma_q->bytes_left_in_line == 0) {
542
543 dma_q->bytes_left_in_line = _line_size;
544 dma_q->lines_completed++;
545 dma_q->is_partial_line = 0;
546
547 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
548
549 vbi_buffer_filled(dev, dma_q, buf);
550
551 dma_q->pos = 0;
552 dma_q->lines_completed = 0;
553 cx231xx_reset_vbi_buffer(dev, dma_q);
554 }
555 }
556
557 return bytes_to_copy;
558 }
559
560 /*
561 * generic routine to get the next available buffer
562 */
get_next_vbi_buf(struct cx231xx_dmaqueue * dma_q,struct cx231xx_buffer ** buf)563 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
564 struct cx231xx_buffer **buf)
565 {
566 struct cx231xx_video_mode *vmode =
567 container_of(dma_q, struct cx231xx_video_mode, vidq);
568 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
569 char *outp;
570
571 if (list_empty(&dma_q->active)) {
572 dev_err(dev->dev, "No active queue to serve\n");
573 dev->vbi_mode.bulk_ctl.buf = NULL;
574 *buf = NULL;
575 return;
576 }
577
578 /* Get the next buffer */
579 *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, list);
580
581 /* Cleans up buffer - Useful for testing for frame/URB loss */
582 outp = vb2_plane_vaddr(&(*buf)->vb.vb2_buf, 0);
583 memset(outp, 0, vb2_plane_size(&(*buf)->vb.vb2_buf, 0));
584
585 dev->vbi_mode.bulk_ctl.buf = *buf;
586
587 return;
588 }
589
cx231xx_reset_vbi_buffer(struct cx231xx * dev,struct cx231xx_dmaqueue * dma_q)590 void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
591 struct cx231xx_dmaqueue *dma_q)
592 {
593 struct cx231xx_buffer *buf;
594
595 buf = dev->vbi_mode.bulk_ctl.buf;
596
597 if (buf == NULL) {
598 /* first try to get the buffer */
599 get_next_vbi_buf(dma_q, &buf);
600
601 dma_q->pos = 0;
602 dma_q->current_field = -1;
603 }
604
605 dma_q->bytes_left_in_line = dev->width << 1;
606 dma_q->lines_completed = 0;
607 }
608
cx231xx_do_vbi_copy(struct cx231xx * dev,struct cx231xx_dmaqueue * dma_q,u8 * p_buffer,u32 bytes_to_copy)609 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
610 u8 *p_buffer, u32 bytes_to_copy)
611 {
612 u8 *p_out_buffer = NULL;
613 u32 current_line_bytes_copied = 0;
614 struct cx231xx_buffer *buf;
615 u32 _line_size = dev->width << 1;
616 void *startwrite;
617 int offset, lencopy;
618
619 buf = dev->vbi_mode.bulk_ctl.buf;
620
621 if (buf == NULL)
622 return -EINVAL;
623
624 p_out_buffer = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
625
626 if (dma_q->bytes_left_in_line != _line_size) {
627 current_line_bytes_copied =
628 _line_size - dma_q->bytes_left_in_line;
629 }
630
631 offset = (dma_q->lines_completed * _line_size) +
632 current_line_bytes_copied;
633
634 if (dma_q->current_field == 2) {
635 /* Populate the second half of the frame */
636 offset += (dev->width * 2 * dma_q->lines_per_field);
637 }
638
639 /* prepare destination address */
640 startwrite = p_out_buffer + offset;
641
642 lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
643 bytes_to_copy : dma_q->bytes_left_in_line;
644
645 memcpy(startwrite, p_buffer, lencopy);
646
647 return 0;
648 }
649
cx231xx_is_vbi_buffer_done(struct cx231xx * dev,struct cx231xx_dmaqueue * dma_q)650 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
651 struct cx231xx_dmaqueue *dma_q)
652 {
653 u32 height = 0;
654
655 height = ((dev->norm & V4L2_STD_625_50) ?
656 PAL_VBI_LINES : NTSC_VBI_LINES);
657 if (dma_q->lines_completed == height && dma_q->current_field == 2)
658 return 1;
659 else
660 return 0;
661 }
662
