Bluetooth: Add quirk for reading BD_ADDR from fwnode property

Add HCI_QUIRK_USE_BDADDR_PROPERTY to allow controllers to retrieve
the public Bluetooth address from the firmware node property
'local-bd-address'. If quirk is set and the property does not exist
or is invalid the controller is marked as unconfigured.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Tested-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index c36dc1e..fbba43e 100644 (file)
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -158,6 +158,18 @@ enum {
         */
        HCI_QUIRK_INVALID_BDADDR,
 
+       /* When this quirk is set, the public Bluetooth address
+        * initially reported by HCI Read BD Address command
+        * is considered invalid. The public BD Address can be
+        * specified in the fwnode property 'local-bd-address'.
+        * If this property does not exist or is invalid controller
+        * configuration is required before this device can be used.
+        *
+        * This quirk can be set before hci_register_dev is called or
+        * during the hdev->setup vendor callback.
+        */
+       HCI_QUIRK_USE_BDADDR_PROPERTY,
+
        /* When this quirk is set, the duplicate filtering during
         * scanning is based on Bluetooth devices addresses. To allow
         * RSSI based updates, restart scanning if needed.

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 26e3d36..d6b2540 100644 (file)
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -30,6 +30,7 @@
 #include <linux/rfkill.h>
 #include <linux/debugfs.h>
 #include <linux/crypto.h>
+#include <linux/property.h>
 #include <asm/unaligned.h>
 
 #include <net/bluetooth/bluetooth.h>
@@ -1355,6 +1356,32 @@ done:
        return err;
 }
 
+/**
+ * hci_dev_get_bd_addr_from_property - Get the Bluetooth Device Address
+ *                                    (BD_ADDR) for a HCI device from
+ *                                    a firmware node property.
+ * @hdev:      The HCI device
+ *
+ * Search the firmware node for 'local-bd-address'.
+ *
+ * All-zero BD addresses are rejected, because those could be properties
+ * that exist in the firmware tables, but were not updated by the firmware. For
+ * example, the DTS could define 'local-bd-address', with zero BD addresses.
+ */
+static void hci_dev_get_bd_addr_from_property(struct hci_dev *hdev)
+{
+       struct fwnode_handle *fwnode = dev_fwnode(hdev->dev.parent);
+       bdaddr_t ba;
+       int ret;
+
+       ret = fwnode_property_read_u8_array(fwnode, "local-bd-address",
+                                           (u8 *)&ba, sizeof(ba));
+       if (ret < 0 || !bacmp(&ba, BDADDR_ANY))
+               return;
+
+       bacpy(&hdev->public_addr, &ba);
+}
+
 static int hci_dev_do_open(struct hci_dev *hdev)
 {
        int ret = 0;
@@ -1422,6 +1449,22 @@ static int hci_dev_do_open(struct hci_dev *hdev)
                if (hdev->setup)
                        ret = hdev->setup(hdev);
 
+               if (ret)
+                       goto setup_failed;
+
+               if (test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks)) {
+                       if (!bacmp(&hdev->public_addr, BDADDR_ANY))
+                               hci_dev_get_bd_addr_from_property(hdev);
+
+                       if (bacmp(&hdev->public_addr, BDADDR_ANY) &&
+                           hdev->set_bdaddr)
+                               ret = hdev->set_bdaddr(hdev,
+                                                      &hdev->public_addr);
+                       else
+                               ret = -EADDRNOTAVAIL;
+               }
+
+setup_failed:
                /* The transport driver can set these quirks before
                 * creating the HCI device or in its setup callback.
                 *

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 1e2acad..2457f40 100644 (file)
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -549,7 +549,8 @@ static bool is_configured(struct hci_dev *hdev)
            !hci_dev_test_flag(hdev, HCI_EXT_CONFIGURED))
                return false;
 
-       if (test_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks) &&
+       if ((test_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks) ||
+            test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks)) &&
            !bacmp(&hdev->public_addr, BDADDR_ANY))
                return false;
 
@@ -564,7 +565,8 @@ static __le32 get_missing_options(struct hci_dev *hdev)
            !hci_dev_test_flag(hdev, HCI_EXT_CONFIGURED))
                options |= MGMT_OPTION_EXTERNAL_CONFIG;
 
-       if (test_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks) &&
+       if ((test_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks) ||
+            test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks)) &&
            !bacmp(&hdev->public_addr, BDADDR_ANY))
                options |= MGMT_OPTION_PUBLIC_ADDRESS;