From 4a51ea8470eecabe401b22142fd1bbcb263953f7 Mon Sep 17 00:00:00 2001
From: Ivy Jian <ivy_jian@compal.com>
Date: Wed, 12 Apr 2017 11:44:22 +0800
Subject: [PATCH] google/kahlee: Add ASL for Elan touchpad

Add ASL for the Elan touchpad driver connection in ChromeOS.
This is based on the Auron and Rambi ASL. The AMD ACPI code
doesn't have the auto table generation the newer Intel
Chrome SOC use.

Device visible to OS: /sys/bus/acpi/devices/ELAN0000

Change-Id: Id3fc8c8855b0296f43a502e81143498d663468ec
Signed-off-by: Ivy Jian <ivy_jian@compal.com>
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/19844
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
---
 .../google/kahlee/acpi/mainboard.asl          | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/mainboard/google/kahlee/acpi/mainboard.asl b/src/mainboard/google/kahlee/acpi/mainboard.asl
index e98d26defd..b7dbc147da 100644
--- a/src/mainboard/google/kahlee/acpi/mainboard.asl
+++ b/src/mainboard/google/kahlee/acpi/mainboard.asl
@@ -34,3 +34,27 @@ Name (SSFG, 0x0D)
 Name (OSVR, 3)		/* WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
 Name (OSV, Ones)	/* Assume nothing */
 Name (PMOD, One)	/* Assume APIC */
+
+Device (ETPA)
+{
+	Name (_HID, "ELAN0000")
+	Name (_DDN, "Elan Touchpad")
+	Name (_UID, 1)
+	Name (ISTP, 1)	/* Touchpad */
+
+	Name (_CRS, ResourceTemplate()
+	{
+		I2cSerialBus (
+			0x15,			/* SlaveAddress */
+			ControllerInitiated,	/* SlaveMode */
+			400000,			/* ConnectionSpeed */
+			AddressingMode7Bit,	/* AddressingMode */
+			"\\_SB.I2CD",		/* ResourceSource */
+		)
+		GpioInt (Level, ActiveLow, ExclusiveAndWake, PullNone,,
+			"\\_SB.GPIO") { 0x5 }
+	})
+
+	/* Allow device to power off in S0 */
+	Name (_S0W, 3)
+}