Ejemplo n.º 1
0
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);
}
Ejemplo n.º 2
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);
}
Ejemplo n.º 3
0
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);
}
Ejemplo n.º 4
0
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);
}