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I was thinking of a program that would grant access to the raspberry pi usb port if the user was authorized and disable it if not. Most of the links I found are regarding the usb port supply, while it is conducive i think it is much safer if the transmit and receive pin at the usb port can be toggled. Thank you in advance!

  • Why are you trying to do this? Will these users have physical access to the Pi, its' connected devices or the SD card? – Steve Robillard Feb 19 '16 at 19:26
  • We're not sure yet if it can be done. There's some stuff that's still not released by Broadcom. – PNDA Feb 20 '16 at 4:16
  • I was working with a prototype of a security device, and I would like the firmware to decide for itself if it would allow the use of usb port accord to its conditions and i got an idea of using external transistors/gates to switch rx/tx, but i was just trying to find a shorter way around without using my gpio – Rev Inguito Feb 20 '16 at 18:10
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Just like this question/answer suggests, there is no way to cut the power or the TX/RX on the USB ports with just software. You will need to add a transistor and do some fancy wiring, which is all described in the answer to that question.

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