Re: How to make USB to work dynamically

Arjun Joshi <arjun.joshi@xxxxxxxxxxxxxx> · Thu, 25 Jun 2009 12:46:46 +0530

Hi Greg,

I am trying to make USB work dynamically on an OMAP board which has a
USB OTG controller. The board has a mini-AB receptacle.

My target is that whenever I insert a mini-B cable the gadget related
kernel modules must be loaded automatically so that my board works as
mass storage device. When i insert a mini-A cable the host mode related
kernel modules must be loaded so that my board works as host.

I have compiled usbcore, HostController drivers(for both host and
gadget mode --- host.ko and gadget.ko) and mass storage support(for HC
in host mode) and file backed storage gadget(for HC in device mode) 

as modules.

What i am currently doing is that I am plugging a mini-A cable,
inserting usbcore,host.ko and usb-storage.ko and I am able to detect a
mobile phone as a mass storage device.

Then I rmmod all the modules, unplug the mini-A cable, insert the
mini-B cable, modprobe the  usbcore, gadget.ko and g_file_storage.ko
which enables my device to be detected as a mass storage device on my
PC.

Now the tricky part is that I want to do all the loading/unloading of
respective modules dynamically (without any human intervention - maybe
through a script) as soon as I insert the cable(either one) or remove
the cable.

My Queries:

1. How do I detect which cable is inserted? Is there a way to find out?

2. Is it possible to do this? If yes, any guidance will greatly help.

Thanks,

Arjun

Greg KH wrote:

  On Sun, Apr 12, 2009 at 08:39:32AM +0530, niamathullah sharief wrote:

    Yes that i know...Is this enough for making USB to enable?

Did you try it out to see if it is?

If so, what problems did you run into?

thanks,

greg k-h

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