linux-kernel - [PATCH v1 03/11] Bluetooth: btnxpuart: Add secure interface TLS authentication support

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Message-ID: <20251118142025.1982263-4-neeraj.sanjaykale@nxp.com>
Date: Tue, 18 Nov 2025 19:50:16 +0530
From: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
To: marcel@...tmann.org,
	luiz.dentz@...il.com
Cc: linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	amitkumar.karwar@....com,
	sherry.sun@....com,
	dmitrii.lebed@....com,
	neeraj.sanjaykale@....com
Subject: [PATCH v1 03/11] Bluetooth: btnxpuart: Add secure interface TLS authentication support

This includes a placeholder nxp_authenticate_device() function if the
chip supports secure interface feature.

Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
---
 drivers/bluetooth/btnxpuart.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c
index 483d812042df..084914e72c44 100644
--- a/drivers/bluetooth/btnxpuart.c
+++ b/drivers/bluetooth/btnxpuart.c
@@ -1598,6 +1598,23 @@ static void nxp_get_fw_version(struct hci_dev *hdev)
 	kfree_skb(skb);
 }
 
+/* Secure Interface */
+static int nxp_authenticate_device(struct hci_dev *hdev)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	int ret = 0;
+
+	/* TODO: Implement actual TLS handshake protocol
+	 * This will include:
+	 * 1. Crypto allocation (SHA256, ECDH-P256)
+	 * 2. Host/Device hello message exchange
+	 * 3. Master secret and traffic key derivation
+	 * 4. Proper error handling and cleanup
+	 */
+
+	return ret;
+}
+
 /* NXP protocol */
 static int nxp_setup(struct hci_dev *hdev)
 {
@@ -1629,6 +1646,12 @@ static int nxp_setup(struct hci_dev *hdev)
 
 	nxp_get_fw_version(hdev);
 
+	if (nxpdev->secure_interface) {
+		err = nxp_authenticate_device(hdev);
+		if (err)
+			return -EACCES;
+	}
+
 	ps_init(hdev);
 
 	if (test_and_clear_bit(BTNXPUART_IR_IN_PROGRESS, &nxpdev->tx_state))
-- 
2.43.0