From c4d8daa7437db2c4d5dba8f2141e7a4552346f1b Mon Sep 17 00:00:00 2001
From: tobhe <tobhe@openbsd.org>
Date: Fri, 25 Nov 2022 20:33:11 +0000
Subject: [PATCH] Disable screen backlight on Apple silicon laptops when lid is
 closed.

ok kettenis@
---
 sys/arch/arm64/dev/aplsmc.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/sys/arch/arm64/dev/aplsmc.c b/sys/arch/arm64/dev/aplsmc.c
index e3a82a7dd6f..449a4f7ce66 100644
--- a/sys/arch/arm64/dev/aplsmc.c
+++ b/sys/arch/arm64/dev/aplsmc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: aplsmc.c,v 1.18 2022/11/14 11:11:17 kettenis Exp $	*/
+/*	$OpenBSD: aplsmc.c,v 1.19 2022/11/25 20:33:11 tobhe Exp $	*/
 /*
  * Copyright (c) 2021 Mark Kettenis <kettenis@openbsd.org>
  *
@@ -37,6 +37,8 @@
 
 #include "apm.h"
 
+extern void (*simplefb_burn_hook)(u_int);
+
 extern void (*cpuresetfn)(void);
 extern void (*powerdownfn)(void);
 
@@ -96,6 +98,10 @@ struct aplsmc_sensor {
 #define SMC_PWRBTN_TOUCHID	0x06
 #define SMC_PWRBTN_LONG		0xfe
 
+/* Lid events */
+#define SMC_LID_OPEN		0x00
+#define SMC_LID_CLOSE		0x01
+
 #define APLSMC_BE		(1 << 0)
 #define APLSMC_HIDDEN		(1 << 1)
 
@@ -372,7 +378,20 @@ aplsmc_handle_notification(struct aplsmc_softc *sc, uint64_t data)
 		}
 		break;
 	case SMC_EV_TYPE_LID:
-		/* XXX Handle lid events. */
+		switch (SMC_EV_SUBTYPE(data)) {
+		case SMC_LID_OPEN:
+			if (simplefb_burn_hook)
+				simplefb_burn_hook(1);
+			break;
+		case SMC_LID_CLOSE:
+			if (simplefb_burn_hook)
+				simplefb_burn_hook(0);
+			break;
+		default:
+			printf("%s: SMV_EV_TYPE_LID 0x%016llx\n",
+			       sc->sc_dev.dv_xname, data);
+			break;
+		}
 		break;
 	default:
 #ifdef APLSMC_DEBUG
-- 
2.20.1