[Linux-kernel-mentees] [PATCH] cec-follower: add tuner analog service emulation

Jiunn Chang c0d1n61at3 at gmail.com
Tue Sep 17 09:43:27 UTC 2019


Implement the following tuner control features:
 - <Select Analogue Service>
 - <Give Tuner Device Status> and reply <Tuner Device Status>

Signed-off-by: Jiunn Chang <c0d1n61at3 at gmail.com>
---
 utils/cec-follower/cec-tuner.cpp | 51 ++++++++++++++++++++++++--------
 1 file changed, 39 insertions(+), 12 deletions(-)

diff --git a/utils/cec-follower/cec-tuner.cpp b/utils/cec-follower/cec-tuner.cpp
index 912adcb9..ed198ac8 100644
--- a/utils/cec-follower/cec-tuner.cpp
+++ b/utils/cec-follower/cec-tuner.cpp
@@ -87,6 +87,28 @@ static unsigned int analog_freqs_khz[3][9][3] =
 	}
 };
 
+static struct cec_op_tuner_device_info tuner_dev_info = {};
+
+static void set_analog_channel_freq(const unsigned int ana_freq_khz) {
+	tuner_dev_info.analog.ana_freq = (ana_freq_khz * 10) / 625;
+}
+
+static bool set_analog_tuner_dev_info(const struct cec_msg *msg)
+{
+	tuner_dev_info.rec_flag = CEC_OP_REC_FLAG_NOT_USED;
+	tuner_dev_info.tuner_display_info = CEC_OP_TUNER_DISPLAY_INFO_ANALOGUE;
+	tuner_dev_info.is_analog = true;
+	cec_ops_select_analogue_service(msg,
+					&tuner_dev_info.analog.ana_bcast_type,
+					&tuner_dev_info.analog.ana_freq,
+					&tuner_dev_info.analog.bcast_system);
+	if (tuner_dev_info.analog.ana_bcast_type > 2 ||
+	    tuner_dev_info.analog.bcast_system > 8)
+		return false;
+	set_analog_channel_freq(analog_freqs_khz[1][tuner_dev_info.analog.bcast_system][tuner_dev_info.analog.ana_bcast_type]);
+	return true;
+}
+
 void process_tuner_record_timer_msgs(struct node *node, struct cec_msg &msg, unsigned me)
 {
 	switch (msg.msg[1]) {
@@ -101,29 +123,34 @@ void process_tuner_record_timer_msgs(struct node *node, struct cec_msg &msg, uns
 		*/
 
 	case CEC_MSG_GIVE_TUNER_DEVICE_STATUS: {
-		if (!cec_has_tuner(1 << me))
+		if (!cec_has_tuner(1 << me) && !cec_has_tv(1 << me))
 			break;
 
-		struct cec_op_tuner_device_info tuner_dev_info = {};
-
 		cec_msg_set_reply_to(&msg, &msg);
-		tuner_dev_info.rec_flag = CEC_OP_REC_FLAG_NOT_USED;
-		tuner_dev_info.tuner_display_info = CEC_OP_TUNER_DISPLAY_INFO_NONE;
-		tuner_dev_info.is_analog = false;
-		tuner_dev_info.digital.service_id_method = CEC_OP_SERVICE_ID_METHOD_BY_CHANNEL;
-		tuner_dev_info.digital.dig_bcast_system = CEC_OP_DIG_SERVICE_BCAST_SYSTEM_DVB_C;
-		tuner_dev_info.digital.channel.channel_number_fmt = CEC_OP_CHANNEL_NUMBER_FMT_1_PART;
-		tuner_dev_info.digital.channel.minor = 1;
-
 		cec_msg_tuner_device_status(&msg, &tuner_dev_info);
 		transmit(node, &msg);
 		return;
 	}
-
 	case CEC_MSG_TUNER_DEVICE_STATUS:
 		return;
 
 	case CEC_MSG_SELECT_ANALOGUE_SERVICE:
+		if (!cec_has_tuner(1 << me) && !cec_has_tv(1 << me))
+			break;
+
+		if (tuner_dev_info.rec_flag == CEC_OP_REC_FLAG_USED) {
+			msg.msg[1] = CEC_MSG_FEATURE_ABORT;
+			msg.msg[2] = CEC_OP_ABORT_REFUSED;
+			transmit(node, &msg);
+			return;
+		}
+		if (!set_analog_tuner_dev_info(&msg)) {
+			msg.msg[1] = CEC_MSG_FEATURE_ABORT;
+			msg.msg[2] = CEC_OP_ABORT_INVALID_OP;
+			transmit(node, &msg);
+			return;
+		}
+		return;
 	case CEC_MSG_SELECT_DIGITAL_SERVICE:
 	case CEC_MSG_TUNER_STEP_DECREMENT:
 	case CEC_MSG_TUNER_STEP_INCREMENT:
-- 
2.23.0



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