Bluetooth: HFP_AG: Ability to reject call

Add a configuration `CONFIG_BT_HFP_AG_REJECT_CALL` for feature
`Ability to reject a call`.

Signed-off-by: Lyle Zhu <[email protected]>

Author: lylezhu2012

subsys/bluetooth/host/classic/Kconfig

@@ -413,6 +413,12 @@ config BT_HFP_AG_HF_INDICATOR_BATTERY
 	help
 	  This option enables HF Indicator Battery level for HFP AG
 
+config BT_HFP_AG_REJECT_CALL
+	bool "Ability to reject a call for HFP AG [EXPERIMENTAL]"
+	default y
+	help
+	  This option enables ability to reject a call for HFP AG
+
 endif # BT_HFP_AG
 
 config BT_AVDTP

subsys/bluetooth/host/classic/hfp_ag.c

@@ -3817,6 +3817,7 @@ int bt_hfp_ag_reject(struct bt_hfp_ag_call *call)
 	int err = 0;
 	struct bt_hfp_ag *ag;
 	bt_hfp_call_state_t call_state;
+	uint32_t ag_features;
 
 	LOG_DBG("");
 
@@ -3837,12 +3838,18 @@ int bt_hfp_ag_reject(struct bt_hfp_ag_call *call)
 	}
 
 	call_state = call->call_state;
+	ag_features = ag->ag_features;
 	hfp_ag_unlock(ag);
 
 	if (!atomic_test_bit(call->flags, BT_HFP_AG_CALL_INCOMING)) {
 		return -EINVAL;
 	}
 
+	if (!(ag_features & BT_HFP_AG_FEATURE_REJECT_CALL)) {
+		LOG_ERR("AG has not ability to reject call");
+		return -ENOTSUP;
+	}
+
 	if (atomic_test_bit(call->flags, BT_HFP_AG_CALL_INCOMING_3WAY)) {
 		if ((call_state == BT_HFP_CALL_ALERTING) || (call_state == BT_HFP_CALL_INCOMING)) {
 			uint8_t call_setup;

subsys/bluetooth/host/classic/hfp_ag_internal.h

@@ -98,6 +98,12 @@
 #define BT_HFP_AG_FEATURE_HF_IND_ENABLE 0
 #endif /* CONFIG_BT_HFP_HF_HF_INDICATORS */
 
+#if defined(CONFIG_BT_HFP_AG_REJECT_CALL)
+#define BT_HFP_AG_FEATURE_REJECT_CALL_ENABLE BT_HFP_AG_FEATURE_REJECT_CALL
+#else
+#define BT_HFP_AG_FEATURE_REJECT_CALL_ENABLE 0
+#endif /* CONFIG_BT_HFP_AG_REJECT_CALL */
+
 /* HFP AG Supported features */
 #define BT_HFP_AG_SUPPORTED_FEATURES (\
 	BT_HFP_AG_FEATURE_3WAY_CALL_ENABLE | \
@@ -111,7 +117,8 @@
 	BT_HFP_AG_FEATURE_ENH_VOICE_RECG_ENABLE | \
 	BT_HFP_AG_FEATURE_VOICE_RECG_TEXT_ENABLE | \
 	BT_HFP_AG_FEATURE_VOICE_TAG_ENABLE | \
-	BT_HFP_AG_FEATURE_HF_IND_ENABLE)
+	BT_HFP_AG_FEATURE_HF_IND_ENABLE | \
+	BT_HFP_AG_FEATURE_REJECT_CALL_ENABLE)
 
 /* HFP AG Supported features in SDP */
 #define BT_HFP_AG_SDP_SUPPORTED_FEATURES (\