--- Alan Stern <[EMAIL PROTECTED]> a écrit :
> On Mon, 7 Nov 2005, moreau francis wrote:
>
> > Hi,
> >
> > I have a simple question on sysfs structure for usb. I haven't find out an
> > answer in neither kernel documentation nor FAQ linux-usb web site. I just
> want
> > to know the naming scheme in /sys/bus/usb/device.
> >
> > For example in my directory I have:
> >
> > # ls /sys/bus/usb/devices/
> > 1-0:1.0 1-1.3 1-1.3.1:1.0 1-1:1.0
> > 1-1 1-1.3.1 1-1.3:1.0 usb1
> >
> > How can I know the meaning of each directory ?
>
> The names that begin with "usb" refer to USB controllers. More
> accurately, they refer to the "root hub" associated with each controller.
> The number is the USB bus number. Apparently you only have one
> controller, so its bus is number 1. Hence the name "usb1".
>
> "1-0:1.0" is a special case. It refers to the root hub's interface. This
> acts just like the interface in an actual hub an almost every respect; see
> below.
>
> All the other entries refer to genuine USB devices and their interfaces.
> The devices are named by a scheme like this:
>
> bus-port.port.port ...
>
> In other words, the name starts with the bus number followed by a '-'.
> Then comes the sequence of port numbers for each of the intermediate hubs
> along the path to the device.
>
> For example, "1-1" is a device plugged into bus 1, port 1. It happens to
> be a hub, and "1-1.3" is the device plugged into port 3 of that hub. That
> device is another hub, and "1-1.3.1" is the device plugged into its port
> 1.
>
> The interfaces are indicated by suffixes having this form:
>
> :config.interface
>
> That is, a ':' followed by the configuration number followed by '.'
> followed by the interface number. In your examples above, each of the
> devices is using configuration 1 and this configuration has only a single
> interface, number 0. So the interfaces show up as
>
> 1-1:1.0 1-1.3:1.0 1-1.3.1:1.0
>
> A hub will never have more than a single interface; that's part of the USB
> spec. But other devices can and do have multiple interfaces (and
> sometimes multiple configurations). Each interface gets its own entry in
> sysfs and can have its own driver.
>
> Alan Stern
>
Thank you very much, Mister Stern, for that clear explanation ! Maybe it could
be added in kernel documentation.
Francis
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