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-rw-r--r--src/ec/compal/ene932/acpi/ec.asl2
-rw-r--r--src/ec/compal/ene932/documentation.txt23
-rw-r--r--src/mainboard/google/parrot/acpi/ec.asl3
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 cb50a21dc5..a042d7588d 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 0000000000..eeb801a73f
--- /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 522a0b9a98..a0ee9d5343 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"