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Documentation: usb: FFS function testing 

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

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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Andrzej Pietrasiewicz 2014-12-16 14:56:29 +01:00 committed by Felipe Balbi
parent 4ca560a6d3
commit 2c0f62f9e4
1 changed files with 24 additions and 0 deletions
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Documentation/usb/gadget-testing.txt
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@ -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