On 06/21/2015 12:11 PM, Xi Ruoyao wrote:
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 <https://github.com/lwfinger/rtl8723au_bt>
('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),
.driver_info = BTUSB_INTEL_BOOT | BTUSB_BROKEN_ISOC },
+ /* 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.
Larry
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.
This approach works well on my tablet. So, which way is better, edit
Generic Bluetooth USB device entry, or add a new 0bda entry?
And below the Generic Bluetooth USB device entry there is Generic
Bluetooth AMP device entry. Should we use USB_INTERFACE_INFO on this too?
--
Xi Ruoyao
School of Aerospace Science and Technology
Xidian University, Xi'an, China
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