From 6784ab1f2e2b4b5a219a701f671d71ad89752052 Mon Sep 17 00:00:00 2001
From: tobhe <tobhe@openbsd.org>
Date: Wed, 22 Nov 2023 18:14:35 +0000
Subject: [PATCH] Add support for keyboard backlight on Apple Powerbooks.

From jon (at) elytron (dot) openbsd (dot) amsterdam
ok gkoehler@
---
 sys/arch/macppc/dev/adb.c       | 30 ++++++++++++++++++++++++++++--
 sys/arch/macppc/dev/pm_direct.c | 21 ++++++++++++++++++++-
 sys/arch/macppc/dev/pm_direct.h |  3 ++-
 3 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/sys/arch/macppc/dev/adb.c b/sys/arch/macppc/dev/adb.c
index 72939e8db3d..8d1e309b4b6 100644
--- a/sys/arch/macppc/dev/adb.c
+++ b/sys/arch/macppc/dev/adb.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: adb.c,v 1.50 2023/04/11 00:45:07 jsg Exp $	*/
+/*	$OpenBSD: adb.c,v 1.51 2023/11/22 18:14:35 tobhe Exp $	*/
 /*	$NetBSD: adb.c,v 1.6 1999/08/16 06:28:09 tsubai Exp $	*/
 /*	$NetBSD: adb_direct.c,v 1.14 2000/06/08 22:10:45 tsubai Exp $	*/
 
@@ -96,6 +96,7 @@
 #include <machine/autoconf.h>
 #include <machine/cpu.h>
 #include <dev/ofw/openfirm.h>
+#include <dev/wscons/wsconsio.h>
 
 #include <dev/adb/adb.h>
 #include <macppc/dev/adbvar.h>
@@ -242,6 +243,12 @@ void	setsoftadb(void);
 int	adb_intr(void *arg);
 void	adb_cuda_autopoll(void);
 void 	adb_cuda_fileserver_mode(void);
+uint8_t pmu_backlight; /* keyboard backlight value */
+int	pmu_get_backlight(struct wskbd_backlight *);
+int	pmu_set_backlight(struct wskbd_backlight *);
+extern int (*wskbd_get_backlight)(struct wskbd_backlight *);
+extern int (*wskbd_set_backlight)(struct wskbd_backlight *);
+
 
 #ifndef SMALL_KERNEL
 void	adb_shutdown(void *);
@@ -1730,8 +1737,11 @@ adbattach(struct device *parent, struct device *self, void *aux)
 
 	if (adbHardware == ADB_HW_CUDA)
 		adb_cuda_fileserver_mode();
-	if (adbHardware == ADB_HW_PMU)
+	if (adbHardware == ADB_HW_PMU) {
+		wskbd_get_backlight = pmu_get_backlight;
+		wskbd_set_backlight = pmu_set_backlight;
 		pmu_fileserver_mode(1);
+	}
 
 	/*
 	 * XXX If the machine doesn't have an ADB bus (PowerBook5,6+)
@@ -1758,3 +1768,19 @@ adbattach(struct device *parent, struct device *self, void *aux)
 		adb_cuda_autopoll();
 	adb_polling = 0;
 }
+
+int
+pmu_get_backlight(struct wskbd_backlight *kbl)
+{
+	kbl->min = 0;
+	kbl->max = 0xff;
+	kbl->curval = pmu_backlight;
+	return 0;
+}
+
+int
+pmu_set_backlight(struct wskbd_backlight *kbl)
+{
+	pmu_backlight = kbl->curval;
+	return pmu_set_kbl(pmu_backlight);
+}
diff --git a/sys/arch/macppc/dev/pm_direct.c b/sys/arch/macppc/dev/pm_direct.c
index 18c4fd17fbd..bf71c2c4fc7 100644
--- a/sys/arch/macppc/dev/pm_direct.c
+++ b/sys/arch/macppc/dev/pm_direct.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pm_direct.c,v 1.34 2022/12/28 07:40:23 jca Exp $	*/
+/*	$OpenBSD: pm_direct.c,v 1.35 2023/11/22 18:14:35 tobhe Exp $	*/
 /*	$NetBSD: pm_direct.c,v 1.9 2000/06/08 22:10:46 tsubai Exp $	*/
 
 /*
@@ -853,3 +853,22 @@ pmu_fileserver_mode(int on)
 	}
 	pmgrop(&p);
 }
+
+int
+pmu_set_kbl(unsigned int level)
+{
+	if (level > 0xff)
+		return (EINVAL);
+
+	PMData p;
+
+	p.command = 0x4F;
+	p.num_data = 3;
+	p.s_buf = p.r_buf = p.data;
+	p.data[0] = 0;
+	p.data[1] = 0;
+	p.data[2] = level;
+	pmgrop(&p);
+	return (0);
+}
+
diff --git a/sys/arch/macppc/dev/pm_direct.h b/sys/arch/macppc/dev/pm_direct.h
index 6caae0ab599..21563fc71fc 100644
--- a/sys/arch/macppc/dev/pm_direct.h
+++ b/sys/arch/macppc/dev/pm_direct.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pm_direct.h,v 1.15 2022/10/21 22:42:36 gkoehler Exp $	*/
+/*	$OpenBSD: pm_direct.h,v 1.16 2023/11/22 18:14:35 tobhe Exp $	*/
 /*	$NetBSD: pm_direct.h,v 1.7 2005/01/07 04:59:58 briggs Exp $	*/
 
 /*
@@ -67,6 +67,7 @@ struct pmu_battery_info
 };
 
 int pm_battery_info(int, struct pmu_battery_info *);
+int pmu_set_kbl(unsigned int);
 
 void pm_eject_pcmcia(int);
 void pmu_fileserver_mode(int);
-- 
2.20.1