/**
* buffer_prepare : callback function for buffer prepare
* @q : buffer queue ptr
* @vb: ptr to video buffer
* @field: field info
*
* This is the callback function for buffer prepare when videobuf_qbuf()
* function is called. The buffer is prepared and user space virtual address
* or user address is converted into physical address
*/
static int vpif_buffer_prepare(struct videobuf_queue *q,
struct videobuf_buffer *vb,
enum v4l2_field field)
{
/* Get the file handle object and channel object */
struct vpif_fh *fh = q->priv_data;
struct channel_obj *ch = fh->channel;
struct common_obj *common;
unsigned long addr;
vpif_dbg(2, debug, "vpif_buffer_prepare\n");
common = &ch->common[VPIF_VIDEO_INDEX];
/* If buffer is not initialized, initialize it */
if (VIDEOBUF_NEEDS_INIT == vb->state) {
vb->width = common->width;
vb->height = common->height;
vb->size = vb->width * vb->height;
vb->field = field;
}
vb->state = VIDEOBUF_PREPARED;
/**
* if user pointer memory mechanism is used, get the physical
* address of the buffer
*/
if (V4L2_MEMORY_USERPTR == common->memory) {
if (0 == vb->baddr) {
vpif_dbg(1, debug, "buffer address is 0\n");
return -EINVAL;
}
vb->boff = vpif_uservirt_to_phys(vb->baddr);
if (!IS_ALIGNED(vb->boff, 8))
goto exit;
}
addr = vb->boff;
if (q->streaming) {
if (!IS_ALIGNED((addr + common->ytop_off), 8) ||
!IS_ALIGNED((addr + common->ybtm_off), 8) ||
!IS_ALIGNED((addr + common->ctop_off), 8) ||
!IS_ALIGNED((addr + common->cbtm_off), 8))
goto exit;
}
return 0;
exit:
vpif_dbg(1, debug, "buffer_prepare:offset is not aligned to 8 bytes\n");
return -EINVAL;
}
/*
* buffer_prepare: This is the callback function called from videobuf_qbuf()
* function the buffer is prepared and user space virtual address is converted
* into physical address
*/
static int vpif_buffer_prepare(struct videobuf_queue *q,
struct videobuf_buffer *vb,
enum v4l2_field field)
{
struct vpif_fh *fh = q->priv_data;
struct common_obj *common;
unsigned long addr;
common = &fh->channel->common[VPIF_VIDEO_INDEX];
if (VIDEOBUF_NEEDS_INIT == vb->state) {
vb->width = common->width;
vb->height = common->height;
vb->size = vb->width * vb->height;
vb->field = field;
}
vb->state = VIDEOBUF_PREPARED;
/* if user pointer memory mechanism is used, get the physical
* address of the buffer */
if (V4L2_MEMORY_USERPTR == common->memory) {
if (!vb->baddr) {
vpif_err("buffer_address is 0\n");
return -EINVAL;
}
vb->boff = vpif_uservirt_to_phys(vb->baddr);
if (!ISALIGNED(vb->boff))
goto buf_align_exit;
}
addr = vb->boff;
if (q->streaming && (V4L2_BUF_TYPE_SLICED_VBI_OUTPUT != q->type)) {
if (!ISALIGNED(addr + common->ytop_off) ||
!ISALIGNED(addr + common->ybtm_off) ||
!ISALIGNED(addr + common->ctop_off) ||
!ISALIGNED(addr + common->cbtm_off))
goto buf_align_exit;
}
return 0;
buf_align_exit:
vpif_err("buffer offset not aligned to 8 bytes\n");
return -EINVAL;
}
