EM28XX_R24_VOFFSET
{EM28XX_R24_VOFFSET, 0x00, 0xff, 0},
ret = em28xx_write_reg(dev, EM28XX_R24_VOFFSET, ctrl->val);
em28xx_write_reg(dev, EM28XX_R24_VOFFSET, RED_BALANCE_DEFAULT);