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Documentation: usb: SERIAL function testing 

Summary of how to test SERIAL function of USB gadget.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
hifive-unleashed-5.1
Andrzej Pietrasiewicz 2014-12-16 14:56:38 +01:00 committed by Felipe Balbi
parent ddb722449c
commit 4dfcec8a2f
1 changed files with 31 additions and 0 deletions
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31
Documentation/usb/gadget-testing.txt
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@ -14,6 +14,7 @@ provided by gadgets.
11. OBEX function
12. PHONET function
13. RNDIS function
14. SERIAL function
1. ACM function
@ -529,3 +530,33 @@ Configure IP addresses of the device and the host. Then:
On the device: ping <host's IP>
On the host: ping <device's IP>
14. SERIAL function
===================
The function is provided by usb_f_gser.ko module.
Function-specific configfs interface
------------------------------------
The function name to use when creating the function directory is "gser".
The SERIAL function provides just one attribute in its function directory:
port_num
The attribute is read-only.
There can be at most 4 ACM/generic serial/OBEX ports in the system.
Testing the SERIAL function
---------------------------
On host: insmod usbserial
echo VID PID >/sys/bus/usb-serial/drivers/generic/new_id
On host: cat > /dev/ttyUSB<X>
On target: cat /dev/ttyGS<Y>
then the other way round
On target: cat > /dev/ttyGS<Y>
On host: cat /dev/ttyUSB<X>