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?
Thank you for the info.
Ping
> if (strcmp(syspath1, syspath2) == 0)
> printf("Yep, they're the same physical device\n");
> else
> printf("Nope, different devices\n");
>
> out:
> udev_device_unref(dev1);
> udev_device_unref(dev2);
> udev_unref(udev);
> return rc;
> }
>
> Cheers,
> Peter
>
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