diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index 9b39e7e3d..167268c08 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -2655,6 +2655,14 @@ struct wpa_driver_ops {
 	 * avoid frequency conflict in single channel concurrency.
 	 */
 	int (*switch_channel)(void *priv, unsigned int freq);
+
+	/**
+	 * start_dfs_cac - Listen for radar interference on the channel
+	 * @priv: Private driver interface data
+	 * @freq: Frequency (in MHz) of the channel
+	 * Returns: 0 on success, -1 on failure
+	 */
+	int (*start_dfs_cac)(void *priv, int freq);
 };
 
 
diff --git a/src/drivers/driver_nl80211.c b/src/drivers/driver_nl80211.c
index 11140f9cd..e5fb23ff0 100644
--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -9446,6 +9446,40 @@ static int nl80211_set_p2p_powersave(void *priv, int legacy_ps, int opp_ps,
 }
 
 
+static int nl80211_start_radar_detection(void *priv, int freq)
+{
+	struct i802_bss *bss = priv;
+	struct wpa_driver_nl80211_data *drv = bss->drv;
+	struct nl_msg *msg;
+	int ret;
+
+	wpa_printf(MSG_DEBUG, "nl80211: Start radar detection (CAC)");
+	if (!(drv->capa.flags & WPA_DRIVER_FLAGS_RADAR)) {
+		wpa_printf(MSG_DEBUG, "nl80211: Driver does not support radar "
+			   "detection");
+		return -1;
+	}
+
+	msg = nlmsg_alloc();
+	if (!msg)
+		return -1;
+
+	nl80211_cmd(bss->drv, msg, 0, NL80211_CMD_RADAR_DETECT);
+	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
+	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
+
+	/* only HT20 is supported at this point */
+	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE, NL80211_CHAN_HT20);
+
+	ret = send_and_recv_msgs(drv, msg, NULL, NULL);
+	if (ret == 0)
+		return 0;
+	wpa_printf(MSG_DEBUG, "nl80211: Failed to start radar detection: "
+		   "%d (%s)", ret, strerror(-ret));
+nla_put_failure:
+	return -1;
+}
+
 #ifdef CONFIG_TDLS
 
 static int nl80211_send_tdls_mgmt(void *priv, const u8 *dst, u8 action_code,
@@ -9878,6 +9912,7 @@ const struct wpa_driver_ops wpa_driver_nl80211_ops = {
 	.set_rekey_info = nl80211_set_rekey_info,
 	.poll_client = nl80211_poll_client,
 	.set_p2p_powersave = nl80211_set_p2p_powersave,
+	.start_dfs_cac = nl80211_start_radar_detection,
 #ifdef CONFIG_TDLS
 	.send_tdls_mgmt = nl80211_send_tdls_mgmt,
 	.tdls_oper = nl80211_tdls_oper,