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Date: Wed, 28 Sep 2011 11:14:11 -0400 (EDT) From: Alan Stern <stern@...land.harvard.edu> To: Sudarshan Jagadale <snjagadale@...il.com> cc: linux-pci@...r.kernel.org, <linux-kernel@...r.kernel.org>, <linux-hotplug@...r.kernel.org>, <linux-usb@...r.kernel.org>, Kay Sievers <kay.sievers@...y.org> Subject: Re: hot plug stable pci name or active pci name detection from /sys file system On Tue, 27 Sep 2011, Sudarshan Jagadale wrote: > Hi , > > I want to create "dev->bus->bus_name" without using usb.h file/writting > kenel module. is there any way to do this or read the active pci name from > /sys/ diectory on linux os? > > i need to generate the bus info field as follows created by usb_make_path(). > > please help to resolve this? There's probably a way to do it using libudev, but I don't know anything about it. Another way to do it is to read the "serial" file in the sysfs directory for the device's root hub. For example, suppose your USB device has a sysfs name like 7-1.2. The bus number is the part before the '-' character, in this example, 7. Then the file you should read would be /sys/bus/usb/devices/usb7/serial. Replace the '7' with the appropriate bus number for whatever device you're working on. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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