参照元†
- struct vb2_queue *q
- struct v4l2_buffer *b
返り値†
/**
* vb2_querybuf() - query video buffer information
* @q: videobuf queue
* @b: buffer struct passed from userspace to vidioc_querybuf handler
* in driver
*
* Should be called from vidioc_querybuf ioctl handler in driver.
* This function will verify the passed v4l2_buffer structure and fill the
* relevant information for the userspace.
*
* The return values from this function are intended to be directly returned
* from vidioc_querybuf handler in driver.
*/
int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)
{
struct vb2_buffer *vb;
int ret;
if (b->type != q->type) {
dprintk(1, "wrong buffer type\n");
return -EINVAL;
}
if (b->index >= q->num_buffers) {
dprintk(1, "buffer index out of range\n");
return -EINVAL;
}
vb = q->bufs[b->index];
ret = __verify_planes_array(vb, b);
return ret ? ret : vb2_core_querybuf(q, b->index, b);
}
EXPORT_SYMBOL(vb2_querybuf);
コメント†