netdev - [PATCH 2/3] Bluetooth: btusb: Add a setup message for CSR dongles showing the Read Local Information values

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Date:   Sat, 29 Oct 2022 22:24:53 +0200
From:   Ismael Ferreras Morezuelas <swyterzone@...il.com>
To:     marcel@...tmann.org, johan.hedberg@...il.com, luiz.dentz@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        luiz.von.dentz@...el.com, quic_zijuhu@...cinc.com,
        hdegoede@...hat.com, swyterzone@...il.com
Cc:     linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH 2/3] Bluetooth: btusb: Add a setup message for CSR dongles showing the Read Local Information values

The rationale of showing this is that it's potentially critical information to diagnose
and find more CSR compatibility bugs in the future and it will save a lot of headaches.

We can't ask normal people to run btmon, but infinitely more users already post their dmesg.
Because in many cases the device doesn't go up, most of the tools won't show these either.

Given that clones come from a wide array of vendors (some are actually Barrot,
some are something else) and these numbers are what let us find differences between
actual and fake ones, it will be immensely helpful to scour the Internet looking
for this pattern and building an actual database to find correlations and
improve the checks. I can't buy a sack of clones and do it myself.

Cc: stable@...r.kernel.org
Cc: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Ismael Ferreras Morezuelas <swyterzone@...il.com>
---
 drivers/bluetooth/btusb.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 1360b2163ec5..8f34bf195bae 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2112,6 +2112,11 @@ static int btusb_setup_csr(struct hci_dev *hdev)

 	rp = (struct hci_rp_read_local_version *)skb->data;

+	bt_dev_info(hdev, "CSR: Setting up dongle with HCI ver=%u rev=%04x; LMP ver=%u subver=%04x; manufacturer=%u",
+		le16_to_cpu(rp->hci_ver), le16_to_cpu(rp->hci_rev),
+		le16_to_cpu(rp->lmp_ver), le16_to_cpu(rp->lmp_subver),
+		le16_to_cpu(rp->manufacturer));
+
 	/* Detect a wide host of Chinese controllers that aren't CSR.
 	 *
 	 * Known fake bcdDevices: 0x0100, 0x0134, 0x1915, 0x2520, 0x7558, 0x8891
-- 
2.38.1