adb shell: List bluetooth input devices

When working with Android key layout files you need to know the (USB) vendor and product ID to place your map file at the correct path of /system/usr/keylayout/Vendor_XXXX_Product_XXXX.kl.

This does not only work for USB but also for Bluetooth devices.

dmesg on the Android phone will contain lines like that when an USB controller is connected:

input: OUYA Game Controller as /devices/virtual/misc/uhid/input14
hid-generic 0005:2836:0001.0002: input: BLUETOOTH HID v1.04 Gamepad [OUYA Game Controller] ...

This lines contain all you need:

Device type
Vendor ID
Product ID

But you don't always want to watch dmesg. An input device directory was created; the path given in dmesg is relative to /sys - /sys/devices/virtual/misc/uhid/input14/.

It contains files that give us the same information as the dmesg line above.

$ cat /sys/devices/virtual/misc/uhid/input14/name
OUYA Game Controller
$ cat /sys/devices/virtual/misc/uhid/input14/id/bustype
$ cat /sys/devices/virtual/misc/uhid/input14/id/vendor
$ cat /sys/devices/virtual/misc/uhid/input14/id/product
$ cat /sys/devices/virtual/misc/uhid/input14/id/version

The possible numbers in the bustype file are enumerated in /usr/include/linux/input.h:

$ grep BUS_ /usr/include/linux/input.h
#define BUS_PCI         0x01
#define BUS_ISAPNP      0x02
#define BUS_USB         0x03
#define BUS_HIL         0x04
#define BUS_BLUETOOTH   0x05
#define BUS_VIRTUAL     0x06
#define BUS_ISA         0x10
#define BUS_I8042       0x11
#define BUS_XTKBD       0x12
#define BUS_RS232       0x13
#define BUS_GAMEPORT    0x14
#define BUS_PARPORT     0x15
#define BUS_AMIGA       0x16
#define BUS_ADB         0x17
#define BUS_I2C         0x18
#define BUS_HOST        0x19
#define BUS_GSC         0x1A
#define BUS_ATARI       0x1B
#define BUS_SPI         0x1C

So if you want to list all bluetooth input devices on your Android phone from the adb shell, iterate over /sys/devices/virtual/misc/uhid/input*/ and check which bustype file contains 5.

Own bluetooth MAC address

To obtain the phone's own bluetooth MAC address, use the following command:

$ settings get secure bluetooth_address

Written by Christian Weiske.

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