[PATCH v5 2/2] Bluetooth: btnxpuart: Add support for set BD address

[Neeraj Sanjay Kale <neeraj.sanjaykale@nxp.com>]

This adds support for setting BD address during hci registration. NXP
FW does not allow vendor commands unless it receives a reset command
after FW download and initialization done.
As a workaround, the .set_bdaddr callback function will first send the
HCI reset command, followed by the actual vendor command to set BD
address.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Johan Korsnes <johan.korsnes@remarkable.no>
Signed-off-by: Kristian Husevåg Krohn <kristian.krohn@remarkable.no>
Tested-by: Neeraj Sanjay Kale <neeraj.sanjaykale@nxp.com>
Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@nxp.com>
---
v4: hci0 interface shows RAW mode if 'local-bd-address' not defined and
    HCI_QUIRK_USE_BDADDR_PROPERTY is set. Add Quirk only if device tree
    property 'local-bd-address' found. (Neeraj)
v5: Initialize local variable ba, update Copywrite year. (Kristian)
---
 drivers/bluetooth/btnxpuart.c | 39 ++++++++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c
index 1230045d78a5..dd9161bfd52c 100644
--- a/drivers/bluetooth/btnxpuart.c
+++ b/drivers/bluetooth/btnxpuart.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  NXP Bluetooth driver
- *  Copyright 2023 NXP
+ *  Copyright 2023-2025 NXP
  */
 
 #include <linux/module.h>
@@ -1197,6 +1197,34 @@ static int nxp_set_ind_reset(struct hci_dev *hdev, void *data)
 	return hci_recv_frame(hdev, skb);
 }
 
+static int nxp_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
+{
+	u8 data[8] = { 0xfe, 0x06, 0, 0, 0, 0, 0, 0 };
+	struct sk_buff *skb;
+	int err;
+
+	memcpy(data + 2, bdaddr, 6);
+
+	skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		err = PTR_ERR(skb);
+		bt_dev_err(hdev, "Reset before setting local-bd-addr failed (%ld)",
+			   PTR_ERR(skb));
+		return err;
+	}
+	kfree_skb(skb);
+
+	skb = __hci_cmd_sync(hdev, 0xfc22, sizeof(data), data, HCI_CMD_TIMEOUT);
+	if (IS_ERR(skb)) {
+		err = PTR_ERR(skb);
+		bt_dev_err(hdev, "Changing device address failed (%d)", err);
+		return err;
+	}
+	kfree_skb(skb);
+
+	return 0;
+}
+
 /* NXP protocol */
 static int nxp_setup(struct hci_dev *hdev)
 {
@@ -1500,6 +1528,7 @@ static int nxp_serdev_probe(struct serdev_device *serdev)
 {
 	struct hci_dev *hdev;
 	struct btnxpuart_dev *nxpdev;
+	bdaddr_t ba = {0};
 
 	nxpdev = devm_kzalloc(&serdev->dev, sizeof(*nxpdev), GFP_KERNEL);
 	if (!nxpdev)
@@ -1547,8 +1576,16 @@ static int nxp_serdev_probe(struct serdev_device *serdev)
 	hdev->send  = nxp_enqueue;
 	hdev->hw_error = nxp_hw_err;
 	hdev->shutdown = nxp_shutdown;
+	hdev->set_bdaddr = nxp_set_bdaddr;
+
 	SET_HCIDEV_DEV(hdev, &serdev->dev);
 
+	device_property_read_u8_array(&nxpdev->serdev->dev,
+				      "local-bd-address",
+				      (u8 *)&ba, sizeof(ba));
+	if (bacmp(&ba, BDADDR_ANY))
+		set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
+
 	if (hci_register_dev(hdev) < 0) {
 		dev_err(&serdev->dev, "Can't register HCI device\n");
 		goto probe_fail;
-- 
2.25.1