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Commit ec91aff7 authored by Andrzej Pietrasiewicz's avatar Andrzej Pietrasiewicz Committed by Felipe Balbi
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Documentation: usb: LOOPBACK function testing 



Summary of how to test LOOPBACK function of USB gadget.

Signed-off-by: default avatarAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent f7e3c3cd

Documentation/usb/gadget-testing.txt

+23 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ provided by gadgets. 
4. EEM function

5. FFS function

6. HID function

7. LOOPBACK function





1. ACM function
@@ -205,3 +206,25 @@ $ ./hid_gadget_test /dev/hidg0 keyboard 


Host:

- observe the keystrokes from the gadget



7. LOOPBACK function

====================



The function is provided by usb_f_ss_lb.ko module.



Function-specific configfs interface

------------------------------------



The function name to use when creating the function directory is "Loopback".

The LOOPBACK function provides these attributes in its function directory:



	qlen		- depth of loopback queue

	bulk_buflen	- buffer length



Testing the LOOPBACK function

-----------------------------



device: run the gadget

host: test-usb



http://www.linux-usb.org/usbtest/testusb.c