Bluetooth: HFP_HF: Activate/deactivate AG indicators

Add a function `bt_hfp_hf_indicator_status` to activate/deactivate AG
indicators.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>

include/zephyr/bluetooth/classic/hfp_hf.h

@@ -848,6 +848,35 @@ int bt_hfp_hf_transmit_dtmf_code(struct bt_hfp_hf_call *call, char code);
  */
 int bt_hfp_hf_query_subscriber(struct bt_hfp_hf *hf);
 
+/* HFP HF Indicators */
+enum hfp_hf_ag_indicators {
+	HF_SERVICE_IND = 0, /* AG service indicator */
+	HF_CALL_IND,        /* AG call indicator */
+	HF_CALL_SETUP_IND,  /* AG call setup indicator */
+	HF_CALL_HELD_IND,   /* AG call held indicator */
+	HF_SINGNAL_IND,     /* AG signal indicator */
+	HF_ROAM_IND,        /* AG roaming indicator */
+	HF_BATTERY_IND      /* AG battery indicator */
+};
+
+/** @brief Handsfree HF set AG indicator activated/deactivated status
+ *
+ *  It allows HF to issue the AT+BIA command if it needs to change the
+ *  activated/deactivated status of indicators in the AG.
+ *  The index of all indicators can be activated/deactivated are
+ *  defined in `enum hfp_hf_ag_indicators`.
+ *  The each bit of parameter `status` represents the indicator status
+ *  corresponding to the index. Such as, value 0b111110 of `status`
+ *  means the AG indicator `service` is required to be deactivated.
+ *  Others are required to be activated.
+ *
+ *  @param hf HFP HF object.
+ *  @param status The activated/deactivated bitmap status of AG indicators.
+ *
+ *  @return 0 in case of success or negative value in case of error.
+ */
+int bt_hfp_hf_indicator_status(struct bt_hfp_hf *hf, uint8_t status);
+
 #ifdef __cplusplus
 }
 #endif

subsys/bluetooth/host/classic/hfp_hf.c

@@ -2461,6 +2461,67 @@ int bt_hfp_hf_query_subscriber(struct bt_hfp_hf *hf)
 	return err;
 }
 
+static int bia_finish(struct at_client *hf_at, enum at_result result,
+		   enum at_cme cme_err)
+{
+	struct bt_hfp_hf *hf = CONTAINER_OF(hf_at, struct bt_hfp_hf, at);
+
+	LOG_DBG("AT+BIA (result %d) on %p", result, hf);
+
+	return 0;
+}
+
+int bt_hfp_hf_indicator_status(struct bt_hfp_hf *hf, uint8_t status)
+{
+	int err;
+	size_t index;
+	char buffer[HF_MAX_AG_INDICATORS * 2 + 1];
+	char *bia_status;
+
+	LOG_DBG("");
+
+	if (!hf) {
+		LOG_ERR("No HF connection found");
+		return -ENOTCONN;
+	}
+
+	if (!atomic_test_bit(hf->flags, BT_HFP_HF_FLAG_CONNECTED)) {
+		LOG_ERR("SLC is not established on %p", hf);
+		return -ENOTCONN;
+	}
+
+	bia_status = &buffer[0];
+	for (index = 0; index < ARRAY_SIZE(hf->ind_table); index++) {
+		if ((hf->ind_table[index] != -1) && (index < NUM_BITS(sizeof(status)))) {
+			if (status & BIT(hf->ind_table[index])) {
+				*bia_status = '1';
+			} else {
+				*bia_status = '0';
+			}
+			bia_status++;
+			*bia_status = ',';
+			bia_status++;
+		} else {
+			break;
+		}
+	}
+
+	if (bia_status <= &buffer[0]) {
+		LOG_ERR("Not found valid AG indicator on %p", hf);
+		return -EINVAL;
+	}
+
+	bia_status--;
+	*bia_status = '\0';
+
+	err = hfp_hf_send_cmd(hf, NULL, bia_finish, "AT+BIA=%s", buffer);
+	if (err < 0) {
+		LOG_ERR("Fail to activated/deactivated AG indicators on %p", hf);
+	}
+
+	return err;
+}
+
 static int ata_finish(struct at_client *hf_at, enum at_result result,
 		   enum at_cme cme_err)
 {

subsys/bluetooth/host/classic/hfp_internal.h

@@ -262,16 +262,6 @@ struct bt_hfp_hf {
 	ATOMIC_DEFINE(flags, BT_HFP_HF_NUM_FLAGS);
 };
 
-enum hfp_hf_ag_indicators {
-	HF_SERVICE_IND,
-	HF_CALL_IND,
-	HF_CALL_SETUP_IND,
-	HF_CALL_HELD_IND,
-	HF_SINGNAL_IND,
-	HF_ROAM_IND,
-	HF_BATTERY_IND
-};
-
 /* HFP call setup status */
 #define BT_HFP_CALL_SETUP_NONE            0
 #define BT_HFP_CALL_SETUP_INCOMING        1