V4L/DVB (11128): cx231xx: convert the calls to subdev format
[linux-2.6.git] / drivers / media / video / cx231xx / cx231xx-vbi.c
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(
144                                 p_buffer + bytes_parsed,        /* p_buffer */
145                                 buffer_size - bytes_parsed, /* buffer size */
146                                 &bytes_used);   /* bytes used to get SAV/EAV */
147
148                         bytes_parsed += bytes_used;
149
150                         sav_eav &= 0xF0;
151                         if (sav_eav && (bytes_parsed < buffer_size)) {
152                                 bytes_parsed += cx231xx_get_vbi_line(dev,
153                                         dma_q, sav_eav, /* SAV/EAV */
154                                         p_buffer+bytes_parsed, /* p_buffer */
155                                         buffer_size-bytes_parsed);/*buf size*/
156                         }
157                 }
158
159                 /* Save the last four bytes of the buffer so we can
160                 check the buffer boundary condition next time */
161                 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4);
162                 bytes_parsed = 0;
163         }
164
165         return rc;
166 }
167
168 /* ------------------------------------------------------------------
169         Vbi buf operations
170    ------------------------------------------------------------------*/
171
172 static int
173 vbi_buffer_setup(struct videobuf_queue *vq, unsigned int *count,
174                  unsigned int *size)
175 {
176         struct cx231xx_fh *fh = vq->priv_data;
177         struct cx231xx *dev = fh->dev;
178         u32 height = 0;
179
180         height = ((dev->norm & V4L2_STD_625_50) ?
181                   PAL_VBI_LINES : NTSC_VBI_LINES);
182
183         *size = (dev->width * height * 2);
184         if (0 == *count)
185                 *count = CX231XX_DEF_VBI_BUF;
186
187         if (*count < CX231XX_MIN_BUF)
188                 *count = CX231XX_MIN_BUF;
189
190         return 0;
191 }
192
193 /* This is called *without* dev->slock held; please keep it that way */
194 static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
195 {
196         struct cx231xx_fh *fh = vq->priv_data;
197         struct cx231xx *dev = fh->dev;
198         unsigned long flags = 0;
199         if (in_interrupt())
200                 BUG();
201
202         /* We used to wait for the buffer to finish here, but this didn't work
203            because, as we were keeping the state as VIDEOBUF_QUEUED,
204            videobuf_queue_cancel marked it as finished for us.
205            (Also, it could wedge forever if the hardware was misconfigured.)
206
207            This should be safe; by the time we get here, the buffer isn't
208            queued anymore. If we ever start marking the buffers as
209            VIDEOBUF_ACTIVE, it won't be, though.
210          */
211         spin_lock_irqsave(&dev->vbi_mode.slock, flags);
212         if (dev->vbi_mode.isoc_ctl.buf == buf)
213                 dev->vbi_mode.isoc_ctl.buf = NULL;
214         spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
215
216         videobuf_vmalloc_free(&buf->vb);
217         buf->vb.state = VIDEOBUF_NEEDS_INIT;
218 }
219
220 static int
221 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
222                    enum v4l2_field field)
223 {
224         struct cx231xx_fh *fh = vq->priv_data;
225         struct cx231xx_buffer *buf =
226             container_of(vb, struct cx231xx_buffer, vb);
227         struct cx231xx *dev = fh->dev;
228         int rc = 0, urb_init = 0;
229         u32 height = 0;
230
231         height = ((dev->norm & V4L2_STD_625_50) ?
232                   PAL_VBI_LINES : NTSC_VBI_LINES);
233         buf->vb.size = ((dev->width << 1) * height);
234
235         if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
236                 return -EINVAL;
237
238         buf->vb.width = dev->width;
239         buf->vb.height = height;
240         buf->vb.field = field;
241         buf->vb.field = V4L2_FIELD_SEQ_TB;
242
243         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
244                 rc = videobuf_iolock(vq, &buf->vb, NULL);
245                 if (rc < 0)
246                         goto fail;
247         }
248
249         if (!dev->vbi_mode.isoc_ctl.num_bufs)
250                 urb_init = 1;
251
252         if (urb_init) {
253                 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
254                                            CX231XX_NUM_VBI_BUFS,
255                                            dev->vbi_mode.alt_max_pkt_size[0],
256                                            cx231xx_isoc_vbi_copy);
257                 if (rc < 0)
258                         goto fail;
259         }
260
261         buf->vb.state = VIDEOBUF_PREPARED;
262         return 0;
263
264 fail:
265         free_buffer(vq, buf);
266         return rc;
267 }
268
269 static void
270 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
271 {
272         struct cx231xx_buffer *buf =
273             container_of(vb, struct cx231xx_buffer, vb);
274         struct cx231xx_fh *fh = vq->priv_data;
275         struct cx231xx *dev = fh->dev;
276         struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
277
278         buf->vb.state = VIDEOBUF_QUEUED;
279         list_add_tail(&buf->vb.queue, &vidq->active);
280
281 }
282
283 static void vbi_buffer_release(struct videobuf_queue *vq,
284                                struct videobuf_buffer *vb)
285 {
286         struct cx231xx_buffer *buf =
287             container_of(vb, struct cx231xx_buffer, vb);
288
289
290         free_buffer(vq, buf);
291 }
292
293 struct videobuf_queue_ops cx231xx_vbi_qops = {
294         .buf_setup   = vbi_buffer_setup,
295         .buf_prepare = vbi_buffer_prepare,
296         .buf_queue   = vbi_buffer_queue,
297         .buf_release = vbi_buffer_release,
298 };
299
300 /* ------------------------------------------------------------------
301         URB control
302    ------------------------------------------------------------------*/
303
304 /*
305  * IRQ callback, called by URB callback
306  */
307 static void cx231xx_irq_vbi_callback(struct urb *urb)
308 {
309         struct cx231xx_dmaqueue *dma_q = urb->context;
310         struct cx231xx_video_mode *vmode =
311             container_of(dma_q, struct cx231xx_video_mode, vidq);
312         struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
313         int rc;
314
315         switch (urb->status) {
316         case 0:         /* success */
317         case -ETIMEDOUT:        /* NAK */
318                 break;
319         case -ECONNRESET:       /* kill */
320         case -ENOENT:
321         case -ESHUTDOWN:
322                 return;
323         default:                /* error */
324                 cx231xx_err(DRIVER_NAME "urb completition error %d.\n",
325                             urb->status);
326                 break;
327         }
328
329         /* Copy data from URB */
330         spin_lock(&dev->vbi_mode.slock);
331         rc = dev->vbi_mode.isoc_ctl.isoc_copy(dev, urb);
332         spin_unlock(&dev->vbi_mode.slock);
333
334         /* Reset status */
335         urb->status = 0;
336
337         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
338         if (urb->status) {
339                 cx231xx_err(DRIVER_NAME "urb resubmit failed (error=%i)\n",
340                             urb->status);
341         }
342 }
343
344 /*
345  * Stop and Deallocate URBs
346  */
347 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
348 {
349         struct urb *urb;
350         int i;
351
352         cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_uninit_vbi_isoc\n");
353
354         dev->vbi_mode.isoc_ctl.nfields = -1;
355         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
356                 urb = dev->vbi_mode.isoc_ctl.urb[i];
357                 if (urb) {
358                         if (!irqs_disabled())
359                                 usb_kill_urb(urb);
360                         else
361                                 usb_unlink_urb(urb);
362
363                         if (dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
364
365                                 kfree(dev->vbi_mode.isoc_ctl.
366                                       transfer_buffer[i]);
367                                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
368                                     NULL;
369                         }
370                         usb_free_urb(urb);
371                         dev->vbi_mode.isoc_ctl.urb[i] = NULL;
372                 }
373                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] = NULL;
374         }
375
376         kfree(dev->vbi_mode.isoc_ctl.urb);
377         kfree(dev->vbi_mode.isoc_ctl.transfer_buffer);
378
379         dev->vbi_mode.isoc_ctl.urb = NULL;
380         dev->vbi_mode.isoc_ctl.transfer_buffer = NULL;
381         dev->vbi_mode.isoc_ctl.num_bufs = 0;
382
383         cx231xx_capture_start(dev, 0, Vbi);
384 }
385 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
386
387 /*
388  * Allocate URBs and start IRQ
389  */
390 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
391                           int num_bufs, int max_pkt_size,
392                           int (*isoc_copy) (struct cx231xx *dev,
393                                             struct urb *urb))
394 {
395         struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
396         int i;
397         int sb_size, pipe;
398         struct urb *urb;
399         int rc;
400
401         cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_prepare_isoc\n");
402
403         /* De-allocates all pending stuff */
404         cx231xx_uninit_vbi_isoc(dev);
405
406         /* clear if any halt */
407         usb_clear_halt(dev->udev,
408                        usb_rcvbulkpipe(dev->udev,
409                                        dev->vbi_mode.end_point_addr));
410
411         dev->vbi_mode.isoc_ctl.isoc_copy = isoc_copy;
412         dev->vbi_mode.isoc_ctl.num_bufs = num_bufs;
413         dma_q->pos = 0;
414         dma_q->is_partial_line = 0;
415         dma_q->last_sav = 0;
416         dma_q->current_field = -1;
417         dma_q->bytes_left_in_line = dev->width << 1;
418         dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
419                                   PAL_VBI_LINES : NTSC_VBI_LINES);
420         dma_q->lines_completed = 0;
421         for (i = 0; i < 8; i++)
422                 dma_q->partial_buf[i] = 0;
423
424         dev->vbi_mode.isoc_ctl.urb = kzalloc(sizeof(void *) * num_bufs,
425                                              GFP_KERNEL);
426         if (!dev->vbi_mode.isoc_ctl.urb) {
427                 cx231xx_errdev("cannot alloc memory for usb buffers\n");
428                 return -ENOMEM;
429         }
430
431         dev->vbi_mode.isoc_ctl.transfer_buffer =
432             kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL);
433         if (!dev->vbi_mode.isoc_ctl.transfer_buffer) {
434                 cx231xx_errdev("cannot allocate memory for usbtransfer\n");
435                 kfree(dev->vbi_mode.isoc_ctl.urb);
436                 return -ENOMEM;
437         }
438
439         dev->vbi_mode.isoc_ctl.max_pkt_size = max_pkt_size;
440         dev->vbi_mode.isoc_ctl.buf = NULL;
441
442         sb_size = max_packets * dev->vbi_mode.isoc_ctl.max_pkt_size;
443
444         /* allocate urbs and transfer buffers */
445         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
446
447                 urb = usb_alloc_urb(0, GFP_KERNEL);
448                 if (!urb) {
449                         cx231xx_err(DRIVER_NAME
450                                     ": cannot alloc isoc_ctl.urb %i\n", i);
451                         cx231xx_uninit_vbi_isoc(dev);
452                         return -ENOMEM;
453                 }
454                 dev->vbi_mode.isoc_ctl.urb[i] = urb;
455                 urb->transfer_flags = 0;
456
457                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
458                     kzalloc(sb_size, GFP_KERNEL);
459                 if (!dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
460                         cx231xx_err(DRIVER_NAME
461                                     ": unable to allocate %i bytes for transfer"
462                                     " buffer %i%s\n", sb_size, i,
463                                     in_interrupt() ? " while in int" : "");
464                         cx231xx_uninit_vbi_isoc(dev);
465                         return -ENOMEM;
466                 }
467
468                 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
469                 usb_fill_bulk_urb(urb, dev->udev, pipe,
470                                   dev->vbi_mode.isoc_ctl.transfer_buffer[i],
471                                   sb_size, cx231xx_irq_vbi_callback, dma_q);
472         }
473
474         init_waitqueue_head(&dma_q->wq);
475
476         /* submit urbs and enables IRQ */
477         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
478                 rc = usb_submit_urb(dev->vbi_mode.isoc_ctl.urb[i], GFP_ATOMIC);
479                 if (rc) {
480                         cx231xx_err(DRIVER_NAME
481                                     ": submit of urb %i failed (error=%i)\n", i,
482                                     rc);
483                         cx231xx_uninit_vbi_isoc(dev);
484                         return rc;
485                 }
486         }
487
488         cx231xx_capture_start(dev, 1, Vbi);
489
490         return 0;
491 }
492 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
493
494 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
495                          u8 sav_eav, u8 *p_buffer, u32 buffer_size)
496 {
497         u32 bytes_copied = 0;
498         int current_field = -1;
499
500         switch (sav_eav) {
501
502         case SAV_VBI_FIELD1:
503                 current_field = 1;
504                 break;
505
506         case SAV_VBI_FIELD2:
507                 current_field = 2;
508                 break;
509         default:
510                 break;
511         }
512
513         if (current_field < 0)
514                 return bytes_copied;
515
516         dma_q->last_sav = sav_eav;
517
518         bytes_copied =
519             cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
520                                   current_field);
521
522         return bytes_copied;
523 }
524
525 /*
526  * Announces that a buffer were filled and request the next
527  */
528 static inline void vbi_buffer_filled(struct cx231xx *dev,
529                                      struct cx231xx_dmaqueue *dma_q,
530                                      struct cx231xx_buffer *buf)
531 {
532         /* Advice that buffer was filled */
533         /* cx231xx_info(DRIVER_NAME "[%p/%d] wakeup\n", buf, buf->vb.i); */
534
535         buf->vb.state = VIDEOBUF_DONE;
536         buf->vb.field_count++;
537         do_gettimeofday(&buf->vb.ts);
538
539         dev->vbi_mode.isoc_ctl.buf = NULL;
540
541         list_del(&buf->vb.queue);
542         wake_up(&buf->vb.done);
543 }
544
545 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
546                           u8 *p_line, u32 length, int field_number)
547 {
548         u32 bytes_to_copy;
549         struct cx231xx_buffer *buf;
550         u32 _line_size = dev->width * 2;
551
552         if (dma_q->current_field != field_number)
553                 cx231xx_reset_vbi_buffer(dev, dma_q);
554
555         /* get the buffer pointer */
556         buf = dev->vbi_mode.isoc_ctl.buf;
557
558         /* Remember the field number for next time */
559         dma_q->current_field = field_number;
560
561         bytes_to_copy = dma_q->bytes_left_in_line;
562         if (bytes_to_copy > length)
563                 bytes_to_copy = length;
564
565         if (dma_q->lines_completed >= dma_q->lines_per_field) {
566                 dma_q->bytes_left_in_line -= bytes_to_copy;
567                 dma_q->is_partial_line =
568                     (dma_q->bytes_left_in_line == 0) ? 0 : 1;
569                 return 0;
570         }
571
572         dma_q->is_partial_line = 1;
573
574         /* If we don't have a buffer, just return the number of bytes we would
575            have copied if we had a buffer. */
576         if (!buf) {
577                 dma_q->bytes_left_in_line -= bytes_to_copy;
578                 dma_q->is_partial_line =
579                     (dma_q->bytes_left_in_line == 0) ? 0 : 1;
580                 return bytes_to_copy;
581         }
582
583         /* copy the data to video buffer */
584         cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
585
586         dma_q->pos += bytes_to_copy;
587         dma_q->bytes_left_in_line -= bytes_to_copy;
588
589         if (dma_q->bytes_left_in_line == 0) {
590
591                 dma_q->bytes_left_in_line = _line_size;
592                 dma_q->lines_completed++;
593                 dma_q->is_partial_line = 0;
594
595                 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
596
597                         vbi_buffer_filled(dev, dma_q, buf);
598
599                         dma_q->pos = 0;
600                         buf = NULL;
601                         dma_q->lines_completed = 0;
602                 }
603         }
604
605         return bytes_to_copy;
606 }
607
608 /*
609  * video-buf generic routine to get the next available buffer
610  */
611 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
612                                     struct cx231xx_buffer **buf)
613 {
614         struct cx231xx_video_mode *vmode =
615             container_of(dma_q, struct cx231xx_video_mode, vidq);
616         struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
617         char *outp;
618
619         if (list_empty(&dma_q->active)) {
620                 cx231xx_err(DRIVER_NAME ": No active queue to serve\n");
621                 dev->vbi_mode.isoc_ctl.buf = NULL;
622                 *buf = NULL;
623                 return;
624         }
625
626         /* Get the next buffer */
627         *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
628
629         /* Cleans up buffer - Usefull for testing for frame/URB loss */
630         outp = videobuf_to_vmalloc(&(*buf)->vb);
631         memset(outp, 0, (*buf)->vb.size);
632
633         dev->vbi_mode.isoc_ctl.buf = *buf;
634
635         return;
636 }
637
638 void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
639                               struct cx231xx_dmaqueue *dma_q)
640 {
641         struct cx231xx_buffer *buf;
642
643         buf = dev->vbi_mode.isoc_ctl.buf;
644
645         if (buf == NULL) {
646                 /* first try to get the buffer */
647                 get_next_vbi_buf(dma_q, &buf);
648
649                 dma_q->pos = 0;
650                 dma_q->current_field = -1;
651         }
652
653         dma_q->bytes_left_in_line = dev->width << 1;
654         dma_q->lines_completed = 0;
655 }
656
657 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
658                         u8 *p_buffer, u32 bytes_to_copy)
659 {
660         u8 *p_out_buffer = NULL;
661         u32 current_line_bytes_copied = 0;
662         struct cx231xx_buffer *buf;
663         u32 _line_size = dev->width << 1;
664         void *startwrite;
665         int offset, lencopy;
666
667         buf = dev->vbi_mode.isoc_ctl.buf;
668
669         if (buf == NULL)
670                 return -EINVAL;
671
672         p_out_buffer = videobuf_to_vmalloc(&buf->vb);
673
674         if (dma_q->bytes_left_in_line != _line_size) {
675                 current_line_bytes_copied =
676                     _line_size - dma_q->bytes_left_in_line;
677         }
678
679         offset = (dma_q->lines_completed * _line_size) +
680                  current_line_bytes_copied;
681
682         /* prepare destination address */
683         startwrite = p_out_buffer + offset;
684
685         lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
686                   bytes_to_copy : dma_q->bytes_left_in_line;
687
688         memcpy(startwrite, p_buffer, lencopy);
689
690         return 0;
691 }
692
693 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
694                               struct cx231xx_dmaqueue *dma_q)
695 {
696         u32 height = 0;
697
698         height = ((dev->norm & V4L2_STD_625_50) ?
699                   PAL_VBI_LINES : NTSC_VBI_LINES);
700         return (dma_q->lines_completed == height) ? 1 : 0;
701 }