Disable keyboard backlight on Apple Silicon laptops on suspend,

restore on wakeup.

ok patrick@ kettenis@

diff --git a/sys/dev/fdt/pwmleds.c b/sys/dev/fdt/pwmleds.c
index 24d2fe0..12b29ee 100644 (file)
--- a/sys/dev/fdt/pwmleds.c
+++ b/sys/dev/fdt/pwmleds.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: pwmleds.c,v 1.1 2022/11/23 23:43:08 kettenis Exp $    */
+/*     $OpenBSD: pwmleds.c,v 1.2 2023/04/25 11:12:38 tobhe Exp $       */
 /*
  * Copyright (c) 2022 Mark Kettenis <kettenis@openbsd.org>
  *
@@ -33,19 +33,22 @@ extern int (*wskbd_get_backlight)(struct wskbd_backlight *);
 extern int (*wskbd_set_backlight)(struct wskbd_backlight *);
 
 struct pwmleds_softc {
-       struct device   sc_dev;
+       struct device           sc_dev;
 
        /* Keyboard backlight. */
-       uint32_t        *sc_pwm;
-       int             sc_pwm_len;
-       uint32_t        sc_max_brightness;
+       uint32_t                *sc_pwm;
+       int                      sc_pwm_len;
+       uint32_t                 sc_max_brightness;
+       struct pwm_state         sc_ps_saved;
 };
 
 int    pwmleds_match(struct device *, void *, void *);
 void   pwmleds_attach(struct device *, struct device *, void *);
+int    pwmleds_activate(struct device *, int);
 
 const struct cfattach pwmleds_ca = {
-       sizeof (struct pwmleds_softc), pwmleds_match, pwmleds_attach
+       sizeof (struct pwmleds_softc), pwmleds_match, pwmleds_attach, NULL,
+       pwmleds_activate
 };
 
 struct cfdriver pwmleds_cd = {
@@ -101,6 +104,29 @@ pwmleds_attach(struct device *parent, struct device *self, void *aux)
        }
 }
 
+int
+pwmleds_activate(struct device *self, int act)
+{
+       struct pwmleds_softc *sc = (struct pwmleds_softc *)self;
+       struct pwm_state ps;
+       int error;
+
+       switch (act) {
+       case DVACT_QUIESCE:
+               error = pwm_get_state(sc->sc_pwm, &sc->sc_ps_saved);
+               if (error)
+                       return error;
+
+               pwm_init_state(sc->sc_pwm, &ps);
+               ps.ps_pulse_width = 0;
+               ps.ps_enabled = 0;
+               return pwm_set_state(sc->sc_pwm, &ps);
+       case DVACT_WAKEUP:
+               return pwm_set_state(sc->sc_pwm, &sc->sc_ps_saved);
+       }
+       return 0;
+}
+
 struct pwmleds_softc *
 pwmleds_kbd_backlight(void)
 {