Bluetooth: Add support for background LE scanning

If we have one or more devices with HCI_AUTO_CONN_REPORT we should do
background scanning and emit mgmt_device_found events. This patch
modifies the hci_update_background_scan() function to extend the
conditions needed to trigger scanning, and adds the necessary code to
process_adv_report() to emit mgmt_device_found events.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 8e0061f..41cc644 100644 (file)
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -5380,9 +5380,10 @@ void hci_update_background_scan(struct hci_dev *hdev)
 
        hci_req_init(&req, hdev);
 
-       if (list_empty(&hdev->pend_le_conns)) {
-               /* If there is no pending LE connections, we should stop
-                * the background scanning.
+       if (list_empty(&hdev->pend_le_conns) && !hdev->pend_le_reports) {
+               /* If there is no pending LE connections or devices
+                * to be scanned for, we should stop the background
+                * scanning.
                 */
 
                /* If controller is not scanning we are done. */

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 846f6a6..87a704b 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -4225,11 +4225,32 @@ static void process_adv_report(struct hci_dev *hdev, u8 type, bdaddr_t *bdaddr,
        bool match;
        u32 flags;
 
-       /* Passive scanning shouldn't trigger any device found events */
+       /* Passive scanning shouldn't trigger any device found events,
+        * except for devices marked as CONN_REPORT for which we do send
+        * device found events.
+        */
        if (hdev->le_scan_type == LE_SCAN_PASSIVE) {
+               struct hci_conn_params *param;
+
                if (type == LE_ADV_IND || type == LE_ADV_DIRECT_IND)
                        check_pending_le_conn(hdev, bdaddr, bdaddr_type);
-               return;
+
+               if (!hdev->pend_le_reports)
+                       return;
+
+               if (type == LE_ADV_DIRECT_IND)
+                       return;
+
+               param = hci_conn_params_lookup(hdev, bdaddr, bdaddr_type);
+               if (!param || param->auto_connect != HCI_AUTO_CONN_REPORT)
+                       return;
+
+               if (type == LE_ADV_NONCONN_IND || type == LE_ADV_SCAN_IND)
+                       flags = MGMT_DEV_FOUND_NOT_CONNECTABLE;
+               else
+                       flags = 0;
+               mgmt_device_found(hdev, bdaddr, LE_LINK, bdaddr_type, NULL,
+                                 rssi, flags, data, len, NULL, 0);
        }
 
        /* When receiving non-connectable or scannable undirected