`cat /proc/devices` from a shell on the android system:  
```
Character devices:
  1 mem
256 msm_rng
  2 pty
  3 ttyp
  4 /dev/vc/0
  4 tty
  5 /dev/tty
  5 /dev/console
  5 /dev/ptmx
  7 vcs
 10 misc
 13 input
 21 sg
 29 fb
 81 video4linux
 86 ch
 89 i2c
108 ppp
116 alsa
128 ptm
136 pts
166 ttyACM
180 usb
188 ttyUSB
189 usb_device
216 rfcomm
235 vm_bms
236 avtimer
237 ttyGS
238 ccid_bridge
239 usbmon
240 usb_ext_chg
241 uio
242 qseecom
243 kgsl
244 smdpkt
245 dia
246 smd
247 subsys
248 voice_svc
249 bsg
250 battery_data
251 media
252 rtc
253 msm_sps
254 msm_thermal_query

Block devices:
  1 ramdisk
259 blkext
  7 loop
  8 sd
 65 sd
 66 sd
 67 sd
 68 sd
 69 sd
 70 sd
 71 sd
128 sd
129 sd
130 sd
131 sd
132 sd
133 sd
134 sd
135 sd
179 mmc
253 zram
254 device-mapper
```