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[v3,1/2] Bluetooth: btusb: Fix detection of some fake CSR controllers with a bcdDevice val of 0x0134

Message ID 20201205150201.5631-2-hdegoede@redhat.com
State Accepted
Commit eefb051b1134ffa700eb403d633610c3ee81c09d
Headers show
Series Bluetooth: btusb: Fake CSR dongle fixes | expand

Commit Message

Hans de Goede Dec. 5, 2020, 3:02 p.m. UTC
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>
---
Changes in v2:
-Add description of chip inside the fake dongle to the commit message
---
 drivers/bluetooth/btusb.c | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 1005b6e8ff74..ac7fede4f951 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...");