3 files changed, 27 insertions, 1 deletions
diff --git a/src/ec/compal/ene932/acpi/ec.asl b/src/ec/compal/ene932/acpi/ec.asl
index cb50a21dc593..a042d7588da8 100644
--- a/src/ec/compal/ene932/acpi/ec.asl
+++ b/src/ec/compal/ene932/acpi/ec.asl
@@ -273,7 +273,7 @@ Device (EC0)
 		Store (ADPT, \PWRS)
 
 		// Initialize LID switch state
-		Store (GP15, \LIDS)
+		Store (EC_ACPI_LID_SWITCH_OBJECT, \LIDS)
 
 		// Force a read of CPU temperature
 		Store (CTML, Local0)
diff --git a/src/ec/compal/ene932/documentation.txt b/src/ec/compal/ene932/documentation.txt
new file mode 100644
index 000000000000..eeb801a73f95
--- /dev/null
+++ b/src/ec/compal/ene932/documentation.txt
@@ -0,0 +1,23 @@
+
+Accessing the EC space
+======================
+
+The ACPI implementation uses the standard I/O ports 0x62 and 0x66 to access the
+EC functionality. Accesses to these ports must be directed to the LPC bus to
+which the EC is connected.
+
+
+Interfacing with the ASL files
+==============================
+
+The mainboard code must define several variables for the ASL files.
+
+* EC_SCI
+  Defines the General Purpose Event (GPE) corresponding to the EC's SCI line.
+* EC_ACPI_LID_SWITCH_OBJECT
+  Defines the APCI object which reads the state of the lid, with 0 = open, and
+  1 = closed. This is usually the bit which reads the GPIO input corresponding
+  to the lid switch.
+* PNOT()
+  The mainboard must define a PNOT method to handle power state notifications
+  and Notify CPU device objects to re-evaluate their _PPC and _CST tables.
diff --git a/src/mainboard/google/parrot/acpi/ec.asl b/src/mainboard/google/parrot/acpi/ec.asl
index 522a0b9a9871..a0ee9d534316 100644
--- a/src/mainboard/google/parrot/acpi/ec.asl
+++ b/src/mainboard/google/parrot/acpi/ec.asl
@@ -21,5 +21,8 @@
 #include "../ec.h"
 #define EC_SCI 23      // GPIO7 << 16 to GPE bit for Runtime SCI
 
+/* GP15 is defined in the southbridge's ASL */
+#define EC_ACPI_LID_SWITCH_OBJECT	GP15
+
 /* ACPI code for EC functions */
 #include "../../../../ec/compal/ene932/acpi/ec.asl"