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| -rw-r--r-- | Documentation/usb/gadget-testing.txt | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Documentation/usb/gadget-testing.txt b/Documentation/usb/gadget-testing.txt index 50b0a6cc6674..141a1d01f312 100644 --- a/Documentation/usb/gadget-testing.txt +++ b/Documentation/usb/gadget-testing.txt @@ -5,6 +5,7 @@ provided by gadgets. 2. ECM function 3. ECM subset function 4. EEM function +5. FFS function 1. ACM function @@ -134,3 +135,26 @@ Configure IP addresses of the device and the host. Then: On the device: ping <host's IP> On the host: ping <device's IP> + +5. FFS function +=============== + +The function is provided by usb_f_fs.ko module. + +Function-specific configfs interface +------------------------------------ + +The function name to use when creating the function directory is "ffs". +The function directory is intentionally empty and not modifiable. + +After creating the directory there is a new instance (a "device") of FunctionFS +available in the system. Once a "device" is available, the user should follow +the standard procedure for using FunctionFS (mount it, run the userspace +process which implements the function proper). The gadget should be enabled +by writing a suitable string to usb_gadget/<gadget>/UDC. + +Testing the FFS function +------------------------ + +On the device: start the function's userspace daemon, enable the gadget +On the host: use the USB function provided by the device |