ec/lenovo/h8/acpi: Add BDC interface

* Add SSDT generator to add dynamic ACPI code.
* Implement GBDC and SBDC for thinkpad_acpi kernel module.
Required for BDC power control from userspace.

Tested on Lenovo T430:
The bluetooth module is detected and can be powercycled using network manager.

Change-Id: Ida825196650966194a883945896a038b0790fe45
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/20985
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/ec/lenovo/h8/acpi/thinkpad.asl b/src/ec/lenovo/h8/acpi/thinkpad.asl
index eb5b60e705..de2fe68192 100644
--- a/src/ec/lenovo/h8/acpi/thinkpad.asl
+++ b/src/ec/lenovo/h8/acpi/thinkpad.asl
@@ -153,4 +153,41 @@ Device (HKEY)
 	{
 		Return (\_SB.PCI0.LPCB.EC.GSTS)
 	}
+
+	/*
+	 * Returns the current state:
+	 *  Bit 0: BT HW present
+	 *  Bit 1: BT radio enabled
+	 *  Bit 2: BT state at resume
+	 */
+	Method (GBDC, 0)
+	{
+		If (HBDC) {
+			Store(One, Local0)
+			If(\_SB.PCI0.LPCB.EC.BTEB)
+			{
+				Or(Local0, 2, Local0)
+			}
+			/* FIXME: Implement state at resume, for now Enabled */
+			Or(Local0, 4, Local0)
+			Return (Local0)
+		} Else {
+			Return (0)
+		}
+	}
+
+	/*
+	 * Set the current state:
+	 *  Bit 1: BT radio enabled
+	 *  Bit 2: BT state at resume
+	 */
+	Method (SBDC, 1)
+	{
+		If (HBDC) {
+			ShiftRight (And(Arg0, 2), 1, Local0)
+			Store (Local0, \_SB.PCI0.LPCB.EC.BTEB)
+
+			/* FIXME: Store state at resume */
+		}
+	}
 }