[PATCH 5.10 343/717] Bluetooth: btusb: Fix detection of some fake CSR controllers with a bcdDevice val of 0x0134

[Greg Kroah-Hartman]

From: Hans de Goede <hdegoede@xxxxxxxxxx>

[ Upstream commit d74e0ae7e03032b47b8631cc1e52a7ae1ce988c0 ]

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@xxxxxxxxxx>
Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
Signed-off-by: Johan Hedberg <johan.hedberg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/bluetooth/btusb.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index a9981678199d7..80468745d5c5e 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1763,6 +1763,8 @@ 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;
@@ -1832,6 +1834,12 @@ 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...");
 
-- 
2.27.0