WD719X_PCI_GPIO_CONTROL
gpio = wd719x_readb(wd, WD719X_PCI_GPIO_CONTROL);
wd719x_writeb(wd, WD719X_PCI_GPIO_CONTROL, gpio);
u8 card = wd719x_readb(wd, WD719X_PCI_GPIO_CONTROL);
wd719x_writeb(wd, WD719X_PCI_GPIO_CONTROL, card);