ec/lenovo/h8/ssdt: Add UWB ACPI interface

Add ACPI methods GUWB and SUWB for thinkpad_acpi.
Required for power control of the UWB module.

Change-Id: I8f9a56e45c0d765b0e06b8d3600bd3575dd09491
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/21003
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/ec/lenovo/h8/acpi/ec.asl

@@ -46,6 +46,9 @@ Device(EC)
 		Offset (0x30),
 				    , 6,
 				ALMT, 1,	/* Audio Mute + LED */
+		Offset (0x31),
+				    , 2,
+				UWBE, 1,	/* Ultra Wideband enable */
 		Offset (0x3a),
 				AMUT, 1,	/* Audio Mute (internal use) */
 				    , 3,

src/ec/lenovo/h8/acpi/thinkpad.asl

@@ -20,6 +20,7 @@ Device (HKEY)
 	External (\HBDC, IntObj)
 	External (\HWAN, IntObj)
 	External (\HKBL, IntObj)
+	External (\HUWB, IntObj)
 
 	Name (_HID, EisaId ("IBM0068"))
 
@@ -259,4 +260,35 @@ Device (HKEY)
 			Store (And(Arg0, 1), \_SB.PCI0.LPCB.EC.WWEB)
 		}
 	}
+
+	/*
+	 * Returns the current state:
+	 *  Bit 0: UWB HW present
+	 *  Bit 1: UWB radio enabled
+	 */
+	Method (GUWB, 0)
+	{
+		If (HUWB) {
+			Store (One, Local0)
+			If(\_SB.PCI0.LPCB.EC.UWBE)
+			{
+				Or(Local0, 2, Local0)
+			}
+			Return (Local0)
+		} Else {
+			Return (0)
+		}
+	}
+
+	/*
+	 * Set the current state:
+	 *  Bit 1: UWB radio enabled
+	 */
+	Method (SUWB, 1)
+	{
+		If (HUWB) {
+			ShiftRight (And(Arg0, 2), 1, Local0)
+			Store (Local0, \_SB.PCI0.LPCB.EC.UWBE)
+		}
+	}
 }

src/ec/lenovo/h8/ssdt.c

@@ -51,6 +51,8 @@ void h8_ssdt_generator(struct device *dev)
 	acpigen_write_name_byte("HWAN", h8_has_wwan(dev) ? ONE_OP : ZERO_OP);
 	acpigen_write_name_byte("HKBL", (conf && conf->has_keyboard_backlight) ?
 				ONE_OP : ZERO_OP);
+	acpigen_write_name_byte("HUWB", (conf && conf->has_uwb) ?
+				ONE_OP : ZERO_OP);
 
 	acpigen_pop_len(); /* Scope HKEY */
 }