auron: add Atmel i2c touch screen to the ACPI resources

BUG=chrome-os-partner:31812
TEST=check if TS is found by the kernel

Change-Id: I22e6a9b65253bd17b639ce4d0742d1e7d3109e0c
Signed-off-by: Bernie Thompson <bhthompson@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/216527
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>

src/mainboard/google/auron/acpi/mainboard.asl

@@ -161,3 +161,38 @@ Scope (\_SB.PCI0.I2C0)
 		Name (_S0W, 4)
 	}
 }
+Scope (\_SB.PCI0.I2C1)
+{
+	Device (ATSA)
+	{
+		Name (_HID, "ATML0001")
+		Name (_DDN, "Atmel Touchscreen")
+		Name (_UID, 5)
+		Name (_S0W, 4)
+		Name (ISTP, 0) /* TouchScreen */
+
+		Name (_CRS, ResourceTemplate()
+	{
+			I2cSerialBus (
+				0x4a,                     // SlaveAddress
+				ControllerInitiated,      // SlaveMode
+				400000,                   // ConnectionSpeed
+				AddressingMode7Bit,       // AddressingMode
+				"\\_SB.PCI0.I2C1",        // ResourceSource
+			)
+
+			// GPIO54 (ball L3) is PIRQW: PIRQL_GSI + PIRQL - PIRQW = PIRQW_GSI
+			// 27 + 3 - 14 = 38
+			Interrupt (ResourceConsumer, Edge, ActiveLow) { 38 }
+		})
+
+		Method (_STA)
+		{
+			If (LEqual (\S2EN, 1)) {
+				Return (0xF)
+			} Else {
+				Return (0x0)
+			}
+		}
+	}
+}