> The buttons on USB devices usually are connected into HID interface. I
> guess that's how your SanDisk card reader button communicates too.

Unfortunately this is not the case.

> If you look at the `lsusb -v` output you'll see how many interfaces that
> it implements. The MSD (Mass Storage Class) is the data channel, which
> normally unrelated to buttons or leds on the device.

My device has only one interface type 08 (mass storage) with two
endpoints type bulk. No interrupt enpoint unfortuantely.

> This page may help you: http://www.frogmouth.net/hid-doco/linux-hid.html

Thanks, I'll check it out.

> Also, your USB endpoints info can be viewed
> in  /sys/class/usb_endpoint/usbdev

I prefer usbview by GregKH.

Thanks,
Chris
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