SIS5595_ENABLE_REG
err = pci_read_config_byte(dev, SIS5595_ENABLE_REG, &enable);
err = pci_write_config_byte(dev, SIS5595_ENABLE_REG, enable | 0x80);
err = pci_read_config_byte(dev, SIS5595_ENABLE_REG, &enable);
retval = pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val);
retval = pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80);
retval = pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val);