SM501_DC_PANEL_CONTROL_VDD
if (to && (control & SM501_DC_PANEL_CONTROL_VDD) == 0) {
control |= SM501_DC_PANEL_CONTROL_VDD; /* FPVDDEN */
} else if (!to && (control & SM501_DC_PANEL_CONTROL_VDD) != 0) {
control &= ~SM501_DC_PANEL_CONTROL_VDD;
SM501_DC_PANEL_CONTROL_VDD |