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authorHans de Goede <hdegoede@redhat.com>2020-12-05 18:02:00 +0300
committerJohan Hedberg <johan.hedberg@intel.com>2020-12-07 18:01:50 +0300
commitd74e0ae7e03032b47b8631cc1e52a7ae1ce988c0 (patch)
tree968959147163c0f03d08dbd663b23f7816ea9c0e /drivers/bluetooth/btusb.c
parentdce0a4be8054f38358d91f8c8ed8e2b0688abec8 (diff)
downloadlinux-d74e0ae7e03032b47b8631cc1e52a7ae1ce988c0.tar.xz
Bluetooth: btusb: Fix detection of some fake CSR controllers with a bcdDevice val of 0x0134
Commit cde1a8a99287 ("Bluetooth: btusb: Fix and detect most of the Chinese Bluetooth controllers") made the detection of fake controllers more generic fixing it for much of the newer fakes / clones. But this does not work for a fake CSR controller with a bcdDevice value of 0x0134, which was correctly identified as fake before this change. Add an extra check for this special case, checking for a combination of a bcdDevice value of 0x0134, together with a lmp_subver of 0x0c5c and a hci_ver of BLUETOOTH_VER_2_0. The chip inside this fake dongle is marked as with "clockwise cw6629d". Fixes: cde1a8a99287 ("Bluetooth: btusb: Fix and detect most of the Chinese Bluetooth controllers") Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Diffstat (limited to 'drivers/bluetooth/btusb.c')
-rw-r--r--drivers/bluetooth/btusb.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index af47c02a2bbd..82ea7b230b17 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1789,6 +1789,8 @@ static int btusb_setup_bcm92035(struct hci_dev *hdev)
static int btusb_setup_csr(struct hci_dev *hdev)
{
+ struct btusb_data *data = hci_get_drvdata(hdev);
+ u16 bcdDevice = le16_to_cpu(data->udev->descriptor.bcdDevice);
struct hci_rp_read_local_version *rp;
struct sk_buff *skb;
bool is_fake = false;
@@ -1858,6 +1860,12 @@ static int btusb_setup_csr(struct hci_dev *hdev)
le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_4_0)
is_fake = true;
+ /* Other clones which beat all the above checks */
+ else if (bcdDevice == 0x0134 &&
+ le16_to_cpu(rp->lmp_subver) == 0x0c5c &&
+ le16_to_cpu(rp->hci_ver) == BLUETOOTH_VER_2_0)
+ is_fake = true;
+
if (is_fake) {
bt_dev_warn(hdev, "CSR: Unbranded CSR clone detected; adding workarounds...");