static int cx18_prepare_buffer(struct videobuf_queue *q,
struct cx18_stream *s,
struct cx18_videobuf_buffer *buf,
u32 pixelformat,
unsigned int width, unsigned int height,
enum v4l2_field field)
{
struct cx18 *cx = s->cx;
int rc = 0;
/* check settings */
buf->bytes_used = 0;
if ((width < 48) || (height < 32))
return -EINVAL;
buf->vb.size = (width * height * 2);
if ((buf->vb.baddr != 0) && (buf->vb.bsize < buf->vb.size))
return -EINVAL;
/* alloc + fill struct (if changed) */
if (buf->vb.width != width || buf->vb.height != height ||
buf->vb.field != field || s->pixelformat != pixelformat ||
buf->tvnorm != cx->std) {
buf->vb.width = width;
buf->vb.height = height;
buf->vb.field = field;
buf->tvnorm = cx->std;
s->pixelformat = pixelformat;
cx18_dma_free(q, s, buf);
}
if ((buf->vb.baddr != 0) && (buf->vb.bsize < buf->vb.size))
return -EINVAL;
if (buf->vb.field == 0)
buf->vb.field = V4L2_FIELD_INTERLACED;
if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
buf->vb.width = width;
buf->vb.height = height;
buf->vb.field = field;
buf->tvnorm = cx->std;
s->pixelformat = pixelformat;
rc = videobuf_iolock(q, &buf->vb, NULL);
if (rc != 0)
goto fail;
}
buf->vb.state = VIDEOBUF_PREPARED;
return 0;
fail:
cx18_dma_free(q, s, buf);
return rc;
}
static void buffer_release(struct videobuf_queue *q,
struct videobuf_buffer *vb)
{
struct cx18_videobuf_buffer *buf =
container_of(vb, struct cx18_videobuf_buffer, vb);
struct cx18_stream *s = q->priv_data;
cx18_dma_free(q, s, buf);
}