-
Marcel Holtmann authored
There exists a set of Bluetooth USB devices that show up on the USB bus as 0a12:0001 and identify themselves as devices from CSR. However they are not. When sending Read Local Version command they now have a split personality and say they are from Broadcom. < HCI Command: Read Local Version Information (0x04|0x0001) plen 0 > HCI Event: Command Complete (0x0e) plen 12 Read Local Version Information (0x04|0x0001) ncmd 1 status 0x00 HCI Version: 2.0 (0x3) HCI Revision: 0x3000 LMP Version: 2.0 (0x3) LMP Subversion: 0x420b Manufacturer: Broadcom Corporation (15) The assumption is that they are neither CSR nor Broadcom based devices and that they are designed and manufactured by someone else. For the most parts they follow the Bluetooth HCI specification and can be used as standard Bluetooth devices. However they have the minor problem that the Delete Stored Link Key command is not working as it should. During the Bluetooth controller setup, this command is needed if stored link keys are supported. For these devices it has to be assumed that this is broken and so just set a quirk to clearly indicate the behavior. After that the setup can just proceed. Now the trick part is to detect these faulty devices since we do not want to punish all CSR and all Broadcom devices. The original devices do actually work according to the specification. What is known so far is that these broken devices set the USB bcdDevice revision information to 1.0 or less. T: Bus=02 Lev=01 Prnt=01 Port=08 Cnt=03 Dev#= 9 Spd=12 MxCh= 0 D: Ver= 2.00 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs= 1 P: Vendor=0a12 ProdID=0001 Rev= 1.00 S: Manufacturer=Bluetooth v2.0 S: Product=Bluetooth V2.0 Dongle T: Bus=05 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs= 1 P: Vendor=0a12 ProdID=0001 Rev= 0.07 In case of CSR devices, the bcdDevice revision contains the firmware build ID and that is normally a higher value. If the bcdDevice revision is 1.0 or less, then an extra setup stage is checking if Read Local Version returns CSR manufacturer information. If not then it will be assumed that this is a broken device and the Delete Stored Link Key command will be marked as broken. Signed-off-by:
Marcel Holtmann <marcel@holtmann.org> Signed-off-by:
Johan Hedberg <johan.hedberg@intel.com>
81cac64b