Change in coreboot[master]: google/kahlee: Add ASL for Elan touchpad

[Marc Jones (Code Review)]

Marc Jones has uploaded a new change for review. ( https://review.coreboot.org/19844 )

Change subject: google/kahlee: Add ASL for Elan touchpad
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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 
Signed-off-by: Marc Jones 
---
M src/mainboard/google/kahlee/acpi/mainboard.asl
1 file changed, 24 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/44/19844/1

diff --git a/src/mainboard/google/kahlee/acpi/mainboard.asl b/src/mainboard/google/kahlee/acpi/mainboard.asl
index e98d26d..b7dbc14 100644
--- a/src/mainboard/google/kahlee/acpi/mainboard.asl
+++ b/src/mainboard/google/kahlee/acpi/mainboard.asl
@@ -34,3 +34,27 @@
 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)
+}