On Sun, Apr 03, 2011 at 07:23:34PM -0700, Ping Cheng wrote:
> On Sun, Apr 3, 2011 at 6:35 PM, Peter Hutterer
> <peter.hutte...@who-t.net>wrote:
>
> > >
> > > What information can the user use for Uniq to associate the devices,
> > which
> > > we do not have in the driver? Both devices have the same product ID and
> > > name.
> >
> > I only have one Bamboo, but the test code below gives me the right answer.
> > argv[1,2] are the two device nodes (/dev/input/eventX and
> > /dev/input/eventY).
> >
> > static struct udev_device *udev_from_file(struct udev *udev, const char
> > *filename)
> > {
> > struct stat st;
> > stat(filename, &st);
> > return udev_device_new_from_devnum(udev, 'c', st.st_rdev);
> > }
> >
> > int main(int argc, char** argv)
> > {
> > int rc = 1;
> > struct udev *udev = NULL;
> > struct udev_device *dev1, *dev2 = NULL;
> > struct udev_device *parent1, *parent2;
> > const char *syspath1, *syspath2;
> >
> > if (argc < 3)
> > goto out;
> >
> > udev = udev_new();
> > dev1 = udev_from_file(udev, argv[1]);
> > dev2 = udev_from_file(udev, argv[2]);
> >
> > if (!dev1 || !dev2)
> > goto out;
> >
> > parent1 = udev_device_get_parent_with_subsystem_devtype(dev1, "usb",
> > "usb_device");
> > parent2 = udev_device_get_parent_with_subsystem_devtype(dev2, "usb",
> > "usb_device");
> >
> > syspath1 = udev_device_get_syspath(parent1);
> > syspath2 = udev_device_get_syspath(parent2);
> >
>
>
> This looks very promising. So, we do not need anything from the user.
> Everything could be done inside the driver. Are you going to make a patch?
can't right now, got too many other things on my slate, sorry.
Cheers,
Peter
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