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| author | Andrzej Pietrasiewicz <andrzej.p@samsung.com> | 2014-12-16 14:56:31 +0100 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2015-01-12 12:13:25 -0600 |
| commit | ec91aff7630df1e1864d95f5efd25c212d484837 (patch) | |
| tree | 0b33fa80d7ad2e5afb6d6e4febb121d17b001fe6 /Documentation/usb | |
| parent | f7e3c3cd2401b3531a3ac4e279a08d03adb722e3 (diff) | |
| download | linux-0-day-ec91aff7630df1e1864d95f5efd25c212d484837.tar.gz linux-0-day-ec91aff7630df1e1864d95f5efd25c212d484837.tar.xz | |
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>
Diffstat (limited to 'Documentation/usb')
| -rw-r--r-- | Documentation/usb/gadget-testing.txt | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/usb/gadget-testing.txt b/Documentation/usb/gadget-testing.txt index f117e5c84a1eb..b13491d1e3528 100644 --- a/Documentation/usb/gadget-testing.txt +++ b/Documentation/usb/gadget-testing.txt @@ -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 |