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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 Original line Diff line number Diff line
@@ -5,6 +5,7 @@ provided by gadgets. 
2. ECM function

2. ECM function

3. ECM subset function

3. ECM subset function

4. EEM function

4. EEM function

5. FFS function









1. ACM 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 device: ping <host's IP>

On the host: ping <device'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