Documentation/usb/gadget-testing.txt

   1 This file summarizes information on basic testing of USB functions
   2 provided by gadgets.
   3
   4 1. ACM function
   5
   6
   7 1. ACM function
   8 ===============
   9
  10 The function is provided by usb_f_acm.ko module.
  11
  12 Function-specific configfs interface
  13 ------------------------------------
  14
  15 The function name to use when creating the function directory is "acm".
  16 The ACM function provides just one attribute in its function directory:
  17
  18         port_num
  19
  20 The attribute is read-only.
  21
  22 There can be at most 4 ACM/generic serial/OBEX ports in the system.
  23
  24
  25 Testing the ACM function
  26 ------------------------
  27
  28 On the host: cat > /dev/ttyACM<X>
  29 On the device : cat /dev/ttyGS<Y>
  30
  31 then the other way round
  32
  33 On the device: cat > /dev/ttyGS<Y>
  34 On the host: cat /dev/ttyACM<X>