linux-kernel - Re: [PATCH RESEND] Bluetooth: btusb: Modify entry to support misc devices with BT interface

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Date:	Sun, 28 Jun 2015 17:32:40 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Xi Ruoyao <xry111@...look.com>,
	Marcel Holtmann <marcel@...tmann.org>
CC:	Johan Hedberg <johan.hedberg@...il.com>,
	"Gustavo F. Padovan" <gustavo@...ovan.org>,
	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] Bluetooth: btusb: Modify entry to support misc
 devices with BT interface

On 06/28/2015 04:49 PM, Xi Ruoyao wrote:
> In the USB device table in btusb driver, the code specify a generic Bluetooth
> device by matching Device Descriptor. However, some devices with BT interface
> are classified as "Miscellaneous Device" and have different Device Descriptor,
> such as Realtek RTL8723AU. Then btusb wouldn't probe them.
>
> To resolve this, specify generic Bluetooth device in the USB device table by
> matching Interface Descriptor, to probe all devices with Bluetooth interface
> including these "Miscellaneous" ones.
>
> Signed-off-by: Xi Ruoyao <xry111@...look.com>
> ---
> The Bluetooth USB driver changed a lot since 4.1 released. However this problem
> still exists now, so I think I should resend this patch.

I have now been able to get this patch tested through the repo at GitHub.com. My 
testers concur that this allows the BT part of the RTL8723AU to load.

Acked-by: Larry Finger <Larry.Finger@...inger.net>

Thanks,

Larry

>
> After apply this patch, my RTL8723AU works well. This is the info of the RTL8723AU
> USB device:
>
> T:  Bus=03 Lev=02 Prnt=02 Port=03 Cnt=03 Dev#=  5 Spd=480  MxCh= 0
> D:  Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs=  1
> P:  Vendor=0bda ProdID=1724 Rev= 2.00
> S:  Manufacturer=Realtek
> S:  Product=802.11n WLAN Adapter
> S:  SerialNumber=00e04c000001
> C:* #Ifs= 3 Cfg#= 1 Atr=e0 MxPwr=500mA
> A:  FirstIf#= 0 IfCount= 2 Cls=e0(wlcon) Sub=01 Prot=01
> I:* If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
> E:  Ad=81(I) Atr=03(Int.) MxPS=  16 Ivl=1ms
> E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
> E:  Ad=03(O) Atr=01(Isoc) MxPS=   0 Ivl=1ms
> E:  Ad=83(I) Atr=01(Isoc) MxPS=   0 Ivl=1ms
> I:  If#= 1 Alt= 1 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
> E:  Ad=03(O) Atr=01(Isoc) MxPS=   9 Ivl=1ms
> E:  Ad=83(I) Atr=01(Isoc) MxPS=   9 Ivl=1ms
> I:  If#= 1 Alt= 2 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
> E:  Ad=03(O) Atr=01(Isoc) MxPS=  17 Ivl=1ms
> E:  Ad=83(I) Atr=01(Isoc) MxPS=  17 Ivl=1ms
> I:  If#= 1 Alt= 3 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
> E:  Ad=03(O) Atr=01(Isoc) MxPS=  25 Ivl=1ms
> E:  Ad=83(I) Atr=01(Isoc) MxPS=  25 Ivl=1ms
> I:  If#= 1 Alt= 4 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
> E:  Ad=03(O) Atr=01(Isoc) MxPS=  33 Ivl=1ms
> E:  Ad=83(I) Atr=01(Isoc) MxPS=  33 Ivl=1ms
> I:  If#= 1 Alt= 5 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
> E:  Ad=03(O) Atr=01(Isoc) MxPS=  49 Ivl=1ms
> E:  Ad=83(I) Atr=01(Isoc) MxPS=  49 Ivl=1ms
>
>   drivers/bluetooth/btusb.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index b4cf8d9..950afda 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -63,7 +63,7 @@ static struct usb_driver btusb_driver;
>
>   static const struct usb_device_id btusb_table[] = {
>   	/* Generic Bluetooth USB device */
> -	{ USB_DEVICE_INFO(0xe0, 0x01, 0x01) },
> +	{ USB_INTERFACE_INFO(0xe0, 0x01, 0x01) },
>
>   	/* Generic Bluetooth AMP device */
>   	{ USB_DEVICE_INFO(0xe0, 0x01, 0x04), .driver_info = BTUSB_AMP },
>

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