This implements default-state support as described in:

https://www.kernel.org/doc/Documentation/devicetree/bindings/leds/leds-gpio.txt

Without this booting the VSATV102 causes the blue "working" led to turn
off when the kernel starts up. With this the led (which is turned on by
the firmware) stays on since that's the default state specified in the FDT.

Expanded the meaning of the led_create_state state parameter in order
to implement support for "keep". The original values were:

== 0             Off
!= 0             On

The new values are:

== -1            don't change / keep current setting
== 0             Off
!= -1 && != 0    On

This should have no effect on acpi_asus_attach which only calls
led_create_state with state set to 1. Updated acpi_ibm_attach
in order to avoid surprises.

Differential Revision:	https://reviews.freebsd.org/D2615
Submitted by:	John Wehle
Reviewed by:	gonzo, loos

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/dev/led/led.c b/sys/dev/led/led.c
index fe0b66b..c519e22 100644
--- a/sys/dev/led/led.c
+++ b/sys/dev/led/led.c
@@ -293,7 +293,8 @@ led_create_state(led_t *func, void *priv, char const *name, int state)
 	mtx_lock(&led_mtx);
 	sc->dev->si_drv1 = sc;
 	LIST_INSERT_HEAD(&led_list, sc, list);
-	sc->func(sc->private, state != 0);
+	if (state != -1)
+		sc->func(sc->private, state != 0);
 	mtx_unlock(&led_mtx);
 
 	return (sc->dev);