asmc: restore keyboard backlight on resume

[joshua stein]

After resume, the keyboard backlight is still off, so restore it
(this was also helpful to figure out the machine was actually
resuming).


Index: sys/dev/isa/asmc.c
===================================================================
RCS file: /cvs/src/sys/dev/isa/asmc.c,v
retrieving revision 1.30
diff -u -p -u -p -r1.30 asmc.c
--- sys/dev/isa/asmc.c  22 Apr 2016 20:45:53 -0000      1.30
+++ sys/dev/isa/asmc.c  10 Feb 2017 00:40:15 -0000
@@ -92,6 +92,7 @@ void  asmc_update(void *);
 int    asmc_match(struct device *, void *, void *);
 void   asmc_attach(struct device *, struct device *, void *);
 int    asmc_detach(struct device *, int);
+int    asmc_activate(struct device *, int);
 
 /* wskbd hook functions */
 void   asmc_backlight(void *);
@@ -101,7 +102,7 @@ extern int (*wskbd_get_backlight)(struct
 extern int (*wskbd_set_backlight)(struct wskbd_backlight *);
 
 const struct cfattach asmc_ca = {
-       sizeof(struct asmc_softc), asmc_match, asmc_attach
+       sizeof(struct asmc_softc), asmc_match, asmc_attach, NULL, asmc_activate
 };
 
 struct cfdriver asmc_cd = {
@@ -355,6 +356,20 @@ asmc_detach(struct device *self, int fla
 
        task_del(systq, &sc->sc_task_backlight);
        asmc_try(sc, ASMC_WRITE, "LKSB", buf, 2);
+       return 0;
+}
+
+int
+asmc_activate(struct device *self, int act)
+{
+       struct asmc_softc *sc = (struct asmc_softc *)self;
+
+       switch (act) {
+       case DVACT_WAKEUP:
+               asmc_backlight(sc);
+               break;
+       }
+
        return 0;
 }