Re: [Libusb-devel] Question regarding libusb and usb devices on linux

[gary c. <bur...@ya...>]

Hi Peter,

I just a had wee' peep at the
/sys/block/sda/device/bus/devices

It does have the symbolic links. I'm trying to
determine how to read the symbolic links:

0:0:0:1->../../devices/pci0000:00/00:00:00:1d.1/usb2/2-2/2-2:1.0/host1/target1:0:0/1:0:0:0


The bus is 2 and the device is 2 located after usb2.

Is that the correct method of determining,bus and
device id?

Much appreciated,
Garyc
 
--- Peter Stuge <stu...@cd...> wrote:

> On Sat, Apr 22, 2006 at 12:05:42PM -0700, gary clark
> wrote:
> > There is some form of indirect mapping between the
> > devices. When linux mounts a usb device it puts
> the
> > first string of manufacturer name in the file
> > /proc/mounts along with the /dev/sdXX. Once I know
> the
> > /dev/sdXX I can ascertain the major and minor
> number.
> > 
> > I think I can use some mapping by reading selected
> > files and determining its matching a USB device
> found
> > using libusb.
> > 
> > If the device found using libusb is not found in
> > /proc/mounts but I know what storage devices exist
> i.e
> > /dev/sdXX then I can then read and parse
> > /sys/block/sdXX/device/vendor and
> > /sys/block/sdXX/device/model.
> 
> Oh, ok. Since you didn't say before I thought you
> were asking about a
> mapping in general.
> 
> For the case usb-storage devices in 2.6 you should
> indeed be able to
> find the corresponding device node reliably.
> 
> You're on the right track in sysfs, iterate over
> /sys/block/sd* and
> match the device symlink target with the bus and
> device number libusb
> gives you. Then you can read major+minor from the
> dev file, or just
> use /dev/<directory_name> directly.
> 
> 
> //Peter
> 
> 
>
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