Re: [PATCH] Bluetooth: btusb: Add Realtek devices into module device table

From: Xi Ruoyao
Date: Sun Jun 21 2015 - 00:16:30 EST

On 06/21/2015 09:12 AM, Larry Finger wrote:
On 06/20/2015 04:58 PM, Marcel Holtmann wrote:
Hi Xi,

In 'commit a2698a9bf9b0 ("Bluetooth: btusb: Add Realtek
8723A/8723B/8761A/8821A support"), support of some Realtek
devices was added to the Generic Bluetooth USB driver in kernel.
However, these devices are not in the module device table of
btusb.ko, so the kernel wouldn't probe them at all.

To fix this, add four entries in the device table btusb_table,
based on code from <>
('new' branch).

This enables bluetooth support in the Lenovo Ideapad Yoga 13
which has RTL8723AU USB device, with product ID 0bda:1724.

Signed-off-by: Xi Ruoyao <xry111@xxxxxxxxxxx>
drivers/bluetooth/btusb.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 3c10d4d..dd87623 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -148,6 +148,12 @@ static const struct usb_device_id btusb_table[] = {
{ USB_DEVICE(0x8087, 0x0a5a),

+ /* Realtek Bluetooth */
+ { USB_VENDOR_AND_INTERFACE_INFO(0x0bda, 0xe0, 0x01, 0x01) },
+ { USB_VENDOR_AND_INTERFACE_INFO(0x0bd5, 0xe0, 0x01, 0x01) },
+ { USB_VENDOR_AND_INTERFACE_INFO(0x13d3, 0xe0, 0x01, 0x01) },
+ { USB_VENDOR_AND_INTERFACE_INFO(0x0489, 0xe0, 0x01, 0x01) },

I highly doubt these are needed. There is a generic entry for an USB transport that is already covering these.

Something changed in recent kernels, and the generic USB transport entries do not seem to be recognized in the case where a wifi and BT device share a single USB ID. As the OP's tablet has such a case, I suggest that 0bda line be accepted, but not the others. If I had a computer with an RTL8723AU, I would have a chance at debugging what changed, but sadly, that is not the case.


I viewed the output of 'lsusb -d 0bda:1724 -v | less', and I found that my RTL8723AU has 'bDeviceClass' 239 (0xef, means 'Miscellaneous Device')
but 'bInterfaceClass' 224 (0xe0, means 'Wireless').

So maybe the Generic Bluetooth USB device entry should be
'{ USB_INTERFACE_INFO(0xe0, 0x01, 0x01) },'
instead of
'{ USB_DEVICE_INFO(0xe0, 0x01, 0x01) },'

Now I'm compiling this.

Xi Ruoyao
School of Aerospace Science and Technology
Xidian University, Xi'an, China

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