[PATCH] Bluetooth: btusb: Add support for Mercusys MA530 Bluetooth adapter

[Santiago Cruz <santiagocr@gmail.com>]

Add support for the Realtek-based Mercusys MA530 Bluetooth 5.3 USB dongle.

The device with USB ID 2c4e:0115 was not recognized by the kernel and
thus was non-functional. This patch adds the device to the quirks table
with BTUSB_REALTEK and BTUSB_WIDEBAND_SPEECH flags, enabling full
functionality.

Tested on:
- Fedora 43, kernel 6.18.3-200.fc43.x86_64
- Device: Mercusys MA530 Adapter (USB ID 2c4e:0115)
- Firmware: rtl8761bu

Signed-off-by: Santiago Cruz <santiagocr@gmail.com>
---
 drivers/bluetooth/btusb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 1234567..abcdefg 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -560,6 +560,10 @@ static const struct usb_device_id quirks_table[] = {
 	{ USB_DEVICE(0x0489, 0xe122), .driver_info = BTUSB_REALTEK |
 						     BTUSB_WIDEBAND_SPEECH },

+	/* Mercusys MA530 Adapter */
+	{ USB_DEVICE(0x2c4e, 0x0115), .driver_info = BTUSB_REALTEK |
+						     BTUSB_WIDEBAND_SPEECH },
+
 	/* Realtek 8852BE Bluetooth devices */
 	{ USB_DEVICE(0x0cb8, 0xc559), .driver_info = BTUSB_REALTEK |
 						     BTUSB_WIDEBAND_SPEECH },
--
2.52.0