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Documentation: usb: LOOPBACK function testing 

Summary of how to test LOOPBACK 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 14:56:31 +01:00 committed by Felipe Balbi
parent f7e3c3cd24
commit ec91aff763
1 changed files with 23 additions and 0 deletions
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Documentation/usb/gadget-testing.txt
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@ -7,6 +7,7 @@ provided by gadgets.
4. EEM function 4. EEM function
5. FFS function 5. FFS function
6. HID function 6. HID function
7. LOOPBACK function
1. ACM function 1. ACM function
@ -205,3 +206,25 @@ $ ./hid_gadget_test /dev/hidg0 keyboard
Host: Host:
- observe the keystrokes from the gadget - 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