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Commit 2c0f62f9 authored by Andrzej Pietrasiewicz's avatar Andrzej Pietrasiewicz Committed by Felipe Balbi
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Documentation: usb: FFS function testing 



Summary of how to test FFS (FunctionFS) function of USB gadget.

Signed-off-by: default avatarAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 4ca560a6

Documentation/usb/gadget-testing.txt

+24 −0
Original line number Diff line number Diff line
@@ -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