pwc_get_size
size = pwc_get_size(pdev, width, height);
size = pwc_get_size(pdev, MAX_WIDTH, MAX_HEIGHT);
size = pwc_get_size(pdev, f->fmt.pix.width, f->fmt.pix.height);
int pwc_get_size(struct pwc_device *pdev, int width, int height);