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Documentation: usb: FFS function testing

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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
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