[PATCH v4 1/2] cec-follower: emulate features for CEC versions < CEC 2.0

[Deborah Brouwer <deborahbrouwer3563@xxxxxxxxx>]

For CEC adapters using versions < CEC 2.0, read the CEC Features
as configured in the CEC adapter and emulate the features that are
present.

Signed-off-by: Deborah Brouwer <deborahbrouwer3563@xxxxxxxxx>
---
 utils/cec-follower/cec-follower.cpp | 42 ++++++++++++++++-------------
 utils/libcecutil/cec-info.cpp       |  2 --
 2 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/utils/cec-follower/cec-follower.cpp b/utils/cec-follower/cec-follower.cpp
index b7a41ac2..1f598fdf 100644
--- a/utils/cec-follower/cec-follower.cpp
+++ b/utils/cec-follower/cec-follower.cpp
@@ -508,26 +508,30 @@ int main(int argc, char **argv)
 
 	cec_driver_info(caps, laddrs, node.phys_addr, conn_info);
 
-	if (laddrs.cec_version >= CEC_OP_CEC_VERSION_2_0) {
-		bool is_dev_feat = false;
-
-		for (__u8 byte : laddrs.features[0]) {
-			if (is_dev_feat) {
-				node.source_has_arc_rx = (byte & CEC_OP_FEAT_DEV_SOURCE_HAS_ARC_RX) != 0;
-				node.sink_has_arc_tx = (byte & CEC_OP_FEAT_DEV_SINK_HAS_ARC_TX) != 0;
-				node.has_aud_rate = (byte & CEC_OP_FEAT_DEV_HAS_SET_AUDIO_RATE) != 0;
-				node.has_deck_ctl = (byte & CEC_OP_FEAT_DEV_HAS_DECK_CONTROL) != 0;
-				node.has_rec_tv = (byte & CEC_OP_FEAT_DEV_HAS_RECORD_TV_SCREEN) != 0;
-				node.has_osd_string = (byte & CEC_OP_FEAT_DEV_HAS_SET_OSD_STRING) != 0;
-				break;
-			}
-			if (byte & CEC_OP_FEAT_EXT)
-				continue;
-			if (!is_dev_feat)
-				is_dev_feat = true;
-			else
-				break;
+	/*
+	 * For CEC 1.4, features of a logical address may still be
+	 * filled in according to the CEC 2.0 guidelines even though
+	 * the CEC framework won’t use the features in the CEC 2.0
+	 * CEC_MSG_REPORT_FEATURES.
+	 */
+	bool is_dev_feat = false;
+
+	for (__u8 byte : laddrs.features[0]) {
+		if (is_dev_feat) {
+			node.source_has_arc_rx = (byte & CEC_OP_FEAT_DEV_SOURCE_HAS_ARC_RX) != 0;
+			node.sink_has_arc_tx = (byte & CEC_OP_FEAT_DEV_SINK_HAS_ARC_TX) != 0;
+			node.has_aud_rate = (byte & CEC_OP_FEAT_DEV_HAS_SET_AUDIO_RATE) != 0;
+			node.has_deck_ctl = (byte & CEC_OP_FEAT_DEV_HAS_DECK_CONTROL) != 0;
+			node.has_rec_tv = (byte & CEC_OP_FEAT_DEV_HAS_RECORD_TV_SCREEN) != 0;
+			node.has_osd_string = (byte & CEC_OP_FEAT_DEV_HAS_SET_OSD_STRING) != 0;
+			break;
 		}
+		if (byte & CEC_OP_FEAT_EXT)
+			continue;
+		if (!is_dev_feat)
+			is_dev_feat = true;
+		else
+			break;
 	}
 	printf("\n");
 
diff --git a/utils/libcecutil/cec-info.cpp b/utils/libcecutil/cec-info.cpp
index 8b3c55e8..3c768261 100644
--- a/utils/libcecutil/cec-info.cpp
+++ b/utils/libcecutil/cec-info.cpp
@@ -448,8 +448,6 @@ void cec_driver_info(const struct cec_caps &caps,
 		       cec_prim_type2s(laddrs.primary_device_type[i]));
 		printf("\t    Logical Address Type   : %s\n",
 		       cec_la_type2s(laddrs.log_addr_type[i]));
-		if (laddrs.cec_version < CEC_OP_CEC_VERSION_2_0)
-			continue;
 		printf("\t    All Device Types       : %s\n",
 		       cec_all_dev_types2s(laddrs.all_device_types[i]).c_str());
 
-- 
2.17.1