Android 4.2 BlueDroid support USB HCI

http://paz00.ru/index.php?title=Bluedroid_4.2_battle&setlang=en
http://stackoverflow.com/questions/17608727/does-android-4-2-2-support-usb-bluetooth-dongle

CyanogenMod and Android-X86 contain patches to support USB HCI like this:

http://review.cyanogenmod.org/#/c/45537/

http://review.cyanogenmod.org/#/c/45538/

http://git.android-x86.org/?p=platform/external/bluetooth/bluedroid.git;a=commit;h=471bdeac2ffe054221b3eab72e3b87523c0aa97c

To enable this support in board look at android-x86 example, for BoardConfig

# Some framework code requires this to enable BT
BOARD_HAVE_BLUETOOTH := true
BLUETOOTH_HCI_USE_USB := true
BOARD_HAVE_BLUETOOTH_BCM := true
BOARD_BLUETOOTH_BDROID_BUILDCFG_INCLUDE_DIR := device/generic/x86/bluetooth

and for buildcfg

#ifndef _BDROID_BUILDCFG_H
#define _BDROID_BUILDCFG_H 
#define BTM_DEF_LOCAL_NAME "Android-x86"
// At present either USB or UART is supported
#define BLUETOOTH_HCI_USE_USB          TRUE
// Bluetooth Low Power Mode is supported on BT4.0
#define HCILP_INCLUDED                 FALSE
#endif

Also your kernel need UHID support.