static int
gpiobus_acquire_bus(device_t busdev, device_t child, int how)
{
struct gpiobus_softc *sc;
sc = device_get_softc(busdev);
GPIOBUS_ASSERT_UNLOCKED(sc);
GPIOBUS_LOCK(sc);
if (sc->sc_owner != NULL) {
if (sc->sc_owner == child)
panic("%s: %s still owns the bus.",
device_get_nameunit(busdev),
device_get_nameunit(child));
if (how == GPIOBUS_DONTWAIT) {
GPIOBUS_UNLOCK(sc);
return (EWOULDBLOCK);
}
while (sc->sc_owner != NULL)
mtx_sleep(sc, &sc->sc_mtx, 0, "gpiobuswait", 0);
}
sc->sc_owner = child;
GPIOBUS_UNLOCK(sc);
return (0);
}
static void
gpiobus_lock_bus(device_t busdev)
{
struct gpiobus_softc *sc;
sc = device_get_softc(busdev);
GPIOBUS_ASSERT_UNLOCKED(sc);
GPIOBUS_LOCK(sc);
}
static void
gpiobus_release_bus(device_t busdev, device_t child)
{
struct gpiobus_softc *sc;
sc = device_get_softc(busdev);
GPIOBUS_ASSERT_UNLOCKED(sc);
GPIOBUS_LOCK(sc);
if (sc->sc_owner == NULL)
panic("gpiobus: releasing unowned bus.");
if (sc->sc_owner != child)
panic("gpiobus: you don't own the bus. game over.");
sc->sc_owner = NULL;
wakeup(sc);
GPIOBUS_UNLOCK(sc);
}
static void
gpiobus_release_bus(device_t busdev, device_t child)
{
struct gpiobus_softc *sc;
sc = device_get_softc(busdev);
GPIOBUS_ASSERT_UNLOCKED(sc);
GPIOBUS_LOCK(sc);
if (sc->sc_owner == NULL)
panic("%s: %s releasing unowned bus.",
device_get_nameunit(busdev),
device_get_nameunit(child));
if (sc->sc_owner != child)
panic("%s: %s trying to release bus owned by %s",
device_get_nameunit(busdev),
device_get_nameunit(child),
device_get_nameunit(sc->sc_owner));
sc->sc_owner = NULL;
wakeup(sc);
GPIOBUS_UNLOCK(sc);
}