From 515d3d2e2c9bd6e12eb5d137cf7e9646b9c7c453 Mon Sep 17 00:00:00 2001
From: Duncan Laurie <dlaurie@chromium.org>
Date: Tue, 15 Jul 2014 13:36:52 -0700
Subject: samus: Enable keyboard backlight

- Turn on keyboard backlight early in boot (not resume) path
as a sign of life for the system
- Add ACPI device for keyboard backlight so the kernel can find
and make use of it

BUG=chrome-os-partner:30586
BRANCH=None
TEST=build and boot on samus

Original-Change-Id: Iecaef0ec5c814774e19d7c4a14cb92dc236cfee3
Original-Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/208152
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
(cherry picked from commit e166f76f9bd167468c7637dcce2b9eabf7dce8f0)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I47927d97c1586ec09310d014d8fba7d7a3d773c4
Reviewed-on: http://review.coreboot.org/8213
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
---
 src/mainboard/google/samus/acpi/mainboard.asl | 18 ++++++++++++++++++
 src/mainboard/google/samus/romstage.c         |  6 +++++-
 2 files changed, 23 insertions(+), 1 deletion(-)

(limited to 'src/mainboard/google')

diff --git a/src/mainboard/google/samus/acpi/mainboard.asl b/src/mainboard/google/samus/acpi/mainboard.asl
index 624aa3822b..3aea40c63f 100644
--- a/src/mainboard/google/samus/acpi/mainboard.asl
+++ b/src/mainboard/google/samus/acpi/mainboard.asl
@@ -50,6 +50,24 @@ Scope (\_SB)
 		Name (_UID, 2)
 		Name (_PRW, Package() { 14, 0x3 }) // GPIO14
 	}
+
+	// Keyboard Backlight interface via EC
+	Device (KBLT) {
+		Name (_HID, "GOOG0002")
+		Name (_UID, 1)
+
+		// Read current backlight value
+		Method (KBQC, 0)
+		{
+			Return (\_SB.PCI0.LPCB.EC0.KBLV)
+		}
+
+		// Write new backlight value
+		Method (KBCM, 1)
+		{
+			Store (Arg0, \_SB.PCI0.LPCB.EC0.KBLV)
+		}
+	}
 }
 
 Scope (\_SB.PCI0.I2C0)
diff --git a/src/mainboard/google/samus/romstage.c b/src/mainboard/google/samus/romstage.c
index c9e13e1dfb..d6528592e4 100644
--- a/src/mainboard/google/samus/romstage.c
+++ b/src/mainboard/google/samus/romstage.c
@@ -25,6 +25,7 @@
 #include <broadwell/gpio.h>
 #include <broadwell/pei_data.h>
 #include <broadwell/pei_wrapper.h>
+#include <broadwell/pm.h>
 #include <broadwell/romstage.h>
 #include <mainboard/google/samus/spd/spd.h>
 #include <mainboard/google/samus/gpio.h>
@@ -33,7 +34,10 @@ void mainboard_romstage_entry(struct romstage_params *rp)
 {
 	struct pei_data pei_data;
 
-	post_code(0x32);
+	post_code(0x31);
+
+	if (rp->power_state->prev_sleep_state != SLEEP_STATE_S3)
+		google_chromeec_kbbacklight(100);
 
 	printk(BIOS_INFO, "MLB: board version %d\n",
 	       google_chromeec_get_board_version());
-- 
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