USB permissions for educational robots

[Gonzalo Odiard]

I think martin_xsa wanted create a group robots too,
as part of http://wiki.laptop.org/go/11.2.0/Robotics_plan

Gonzalo

On Tue, Jan 3, 2012 at 11:12 AM, Paul Fox <pgf at laptop.org> wrote:

> roughly speaking, we chose the "dialout" group because a) it's a
> traditional group for access to UNIX serial devices, b) many USB
> devices that activities need access to are actually serial devices,
> and c) the "olpc" user is already a member of "dialout".  is it
> important that Lego devices be protected by a separate group
> membership?
>
> the current udev rule isn't added by Sugar -- it's in the olpc-utils
> rpm distributed by OLPC.  we can add a modified rule once we agree
> on what it should look like.
>
> i can't remember at the moment where the default passwd and group
> files come from -- if the rule needs a new group, we'll need to modify
> those files as well.
>
> paul
>
> alan jhonn aguiar schwyn wrote:
>  >
>  > Hi,
>  > In a few of months, all our High Schools (of Uruguay) will receive and
> robotic
>  > kit (Lego).
>  > At "Universidad de la República", "Facultad de Ingeniería" we are
> workingwith
>  > it and the XO...
>  > http://www.youtube.com/watch?v=S8HRbDLO7LM
>  >
>  > In other parallel road, we are working on a 2.0 version of the Butia
> Robot
>  > www.fing.edu.uy/inco/proyectos/butia
>  >
>  > That uses USB4all IO board  which resulted from a thesis given at
> ourUniversity
>  > (also will have arduino compatibility)
>  > http://www.fing.edu.uy/inco/grupos/mina/pGrado/pgusb/
>  >
>  > USB4all is based on 18f4550 pic.The vendor is Microchip,
>  > SYSFS{idVendor}=="04d8"And have: productID=0x000b //bootloader
>  > productID=0x000c //pic18f4550 generic comunication
>  >
>  > The actual Sugar image, only have permissions for LEGO WeDo.
>  > If you see in: /etc/udev/rules.d you find the correspondient:
>  > "30-olpc-wedo.rules".
>  > The file add this rule:
>  > SYSFS{idVendor}=="0694", SYSFS{idProduct}=="0003", GROUP="dialout",
> MODE="0660"
>  > This means: 0694 is LEGO                   0003 the model: WeDo
>  > To the NXT we need add: {idProduct}=="0002"
>  > But, for each model add a new line.. not is a good form..
>  > Exist another way, a generic rule:
>  > BUS=="usb", SYSFS{idVendor}=="0694", GROUP="lego", MODE="0660"
>  > That says: if is USB and fabricated by 0694 (LEGO) lets 0660 (4: read+
> 2: write)
>  > If add this permissions to "lego" group, we need create it..
>  > But, we don't make it, an use an existing group like "root"? Or
> another...
>  > Suggestions?
>  > We can make a generic group "robot" that have permissions for: lego
> wedo, lego
>  > nxt, butia, etc...
>  > Regards!
>  > Alan                                           part 2     text/plain
>               129
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> =---------------------
>  paul fox, pgf at laptop.org
>
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