THINKPAD_EC_MASK_MUTE
val_ec = (arg == 1) ? val_ec | THINKPAD_EC_MASK_MUTE :
val_ec & (~THINKPAD_EC_MASK_MUTE);
val = ((val_ec & THINKPAD_EC_MASK_MUTE) == THINKPAD_EC_MASK_MUTE);
val = ((val_ec & THINKPAD_EC_MASK_MUTE) == THINKPAD_EC_MASK_MUTE);