On Thu, 25 Aug 2016, Jacek Anaszewski wrote:
> I'd see it as follows:
>
> #cat available_ports
> #1-1 1-2 2-1
>
> #echo "1-1" > new_port
>
> #cat observed_ports
> #1-1
>
> #echo "2-1" > new_port
>
> #cat observed_ports
> #1-1 2-1
>
> We've already had few discussions about the sysfs designs trying
> to break the one-value-per-file rule for LED class device, and
> there was always strong resistance against.
This scheme has multiple values in both the available_ports and
observed_ports files. :-( Not that I have any better suggestions...
> >> Also a description of the device connected to the port would be a nice
> >> feature, however I am not certain about the feasibility thereof.
> >
> > What kind of description do you mean? Where should it be used / where
> > should it appear?
> >
>
> Product name/symbol. Actually it should be USB subsystem responsibility
> to provide the means for querying the product name by port id, if it
> is possible at all.
cat /sys/bus/usb/devices/PORT/product
cat /sys/bus/usb/devices/PORT/manufacturer
These will work if there is a device registered under PORT.
Alan Stern
