How to detect connection on USB device port?

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Hi all,

I am using the /g_file_storage/gadget driver. I was wondering if it is possible to detect if a cable (and USB host) is connected to the USB device port.

Looks like the driver prints the following message to dmesg when the host is connected:
g_file_storage gadget: full speed config #1

But there is no message when it is disconnected. So how can I check the current status of the connection. Is there some status file in sysfs I can look at?
Any other possibility?

Thanks, Ondrej



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