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[gpioled] add support for inverting the LED polarity.

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No, this isn't a star trek science joke - sometimes LEDs are wired
up to be active low, so this is needed.

Submitted by:	Dan Nelson <dnelson_1901@yahoo.com>
This commit is contained in:
Adrian Chadd 2016-07-31 06:24:26 +00:00
parent 454df496b8
commit d75e8c5089
1 changed files with 5 additions and 0 deletions
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5
sys/dev/gpio/gpioled.c
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@ -66,6 +66,7 @@ struct gpioled_softc
device_t sc_busdev;
struct mtx sc_mtx;
struct cdev *sc_leddev;
int sc_invert;
};
static void gpioled_control(void *, int);
@ -82,6 +83,8 @@ gpioled_control(void *priv, int onoff)
GPIOLED_LOCK(sc);
if (GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
GPIO_PIN_OUTPUT) == 0) {
if (sc->sc_invert)
onoff = !onoff;
GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
}
@ -199,6 +202,8 @@ gpioled_attach(device_t dev)
if (resource_string_value(device_get_name(dev),
device_get_unit(dev), "name", &name))
name = NULL;
resource_int_value(device_get_name(dev),
device_get_unit(dev), "invert", &sc->sc_invert);
#endif
sc->sc_leddev = led_create_state(gpioled_control, sc, name ? name :