ec/google/wilco: Fix extended event handling

Extended events will be handled by the OS kernel driver, but that
driver needs a method exposed by ACPI to read the event data from
the EC and into a buffer.

Tested by generating a hotkey event and reading the buffer from
the Linux kernel driver with acpi_evaluate_object().

Change-Id: Ic8510e38d777a5dd31a5237867313efefeb2b48e
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/29674
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 17 insertions, 7 deletions

diff --git a/src/ec/google/wilco/acpi/event.asl b/src/ec/google/wilco/acpi/event.asl
index b43086c6c3..4d796b5c85 100644
--- a/src/ec/google/wilco/acpi/event.asl
+++ b/src/ec/google/wilco/acpi/event.asl
@@ -76,6 +76,11 @@ Method (ECQ1, 1, Serialized)
 Method (ECQ2, 1, Serialized)
 {
 	Printf ("EVT2: %o", Arg0)
+
+	If (EBIT (E2QS, Arg0)) {
+		Printf ("QS EVENT")
+		Notify (^WLCO, 0x90)
+	}
 }
 
 /* Handle events in PmEv3 */
@@ -90,12 +95,6 @@ Method (ECQ4, 1, Serialized)
 	Printf ("EVT4: %o", Arg0)
 }
 
-/* Handle QuickSet events */
-Method (ECQS, 1, Serialized)
-{
-	Printf ("QS EVENT %o", Arg0)
-}
-
 /* Process all events */
 Method (_Q66, 0, Serialized)
 {
@@ -118,9 +117,20 @@ Method (_Q66, 0, Serialized)
 	If (Local0) {
 		ECQ4 (Local0)
 	}
+}
 
+/* Get Event Buffer */
+Method (QSET, 0, Serialized)
+{
+	/* Get count of event bytes */
 	Local0 = R (QSEC)
+	Name (QBUF, Buffer (Local0) {})
+
+	/* Fill QS event buffer with Local0 bytes */
 	For (Local1 = 0, Local1 < Local0, Local1++) {
-		ECQS (R (QSEB))
+		QBUF[Local1] = R (QSEB)
 	}
+
+	Printf ("QS = %o", QBUF)
+	Return (QBUF)
 }