On Thu, 28 Mar 2013, Greg KH wrote: > On Thu, Mar 28, 2013 at 02:44:01PM -0400, Alan Stern wrote: > > On Thu, 28 Mar 2013, Greg KH wrote: > > > > > > >>ls /sys/bus/usb/devices > > > > >>1-0:1.0 2-0:1.0 port1-1 port1-1.3 port2-1.2 port2-2 port4-3 > > > > >>1-1 2-1 port1-1.1 port1-1.4 port2-1.3 port3-1 port4-4 > > > > >>1-1.1 2-1:1.0 port1-1.2 port1-1.5 port2-1.4 port3-2 usb1 > > > > >>1-1:1.0 3-0:1.0 port1-1.2.1 port1-1.6 port2-1.5 port3-3 usb2 > > > > >>1-1.1:1.0 3-1 port1-1.2.2 port1-2 port2-1.6 port3-4 usb3 > > > > >>1-1.2 3-1:1.0 port1-1.2.3 port2-1 port2-1.7 port4-1 usb4 > > > > >>1-1.2:1.0 4-0:1.0 port1-1.2.4 port2-1.1 port2-1.8 port4-2 > > > > > > > > > >What does it look like if you reverse the naming scheme (hub dev name + > > > > >"port")? Doesn't that show the devices in a bit more logical way? > > > > Hi Greg: > > > > Do you mean e.g "port1.2-1", originally it's "port2-1.1". > > > > 2-1 is hub dev name? > > > > > > No, I mean "2-1.port1" as these are the ports on the device, the device > > > prefix should go first, right? > > > > > > > If right, how about root hub port and it should be port2.usb1? > > > > > > "usb1.port2" > > > > Is this a good idea? There are userspace programs that look through > > the list of files in /sys/bus/usb/devices, and they probably expect > > filenames beginning with a number or with 'usb' to be USB devices and > > interfaces. > > What userspace programs? In the past I have answered questions from people wanting to know how to write a program that could go from bus & device numbers to paths in sysfs. The answer was to look at all the links in /sys/bus/usb/devices for names beginning with a digit or with "usb", eliminate those whose names contain ':' as they are interfaces rather than devices, and then check the busnum and devnum files in each of the remaining directories. Also, libusb/libusbx uses a similar scheme to search through the entries in /sys/bus/usb/devices, looking for parent-child relationships. > And if they do that, then we shouldn't put the ports in here at all. This is one of those cloudy issues. We're probably okay if the name begins with something other than a digit or a 'u'. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
