vald_acpi_ghci_set
static ACPI_STATUS vald_acpi_ghci_set(struct vald_acpi_softc *, uint32_t,
rv = vald_acpi_ghci_set(sc, GHCI_SYSTEM_EVENT_FIFO, GHCI_ENABLE,
rv = vald_acpi_ghci_set(sc, GHCI_HOTKEY_EVENT, GHCI_ENABLE, &result);
rv = vald_acpi_ghci_set(sc, GHCI_BACKLIGHT, backlight_new,
rv = vald_acpi_ghci_set(sc, GHCI_FAN, value, &result);