Re: Findind input event device path with libudev

On Wed, 16 Nov 2011 14:44:08 +0000
Nuno Santos [off-list ref] wrote:

Hi,

After digging a little bit around this i found that my problem is with 
this function:

dev = udev_device 
*udev_device_get_parent_with_subsystem_devtype(dev,"usb","usb_device");

dev is always null. He can't find me the usb device for my input device. 
Maybe i'm not specifiying subsystem and dev type correctly.

If I make several calls to udev_device_get_parent I can get to the 
correct device.

Does anyone knows what should be the correct subsystem and dev type pair 
to find the parent usb device for an input device?

You can find out the most specific subsystem and devtype yourself using:

	udevadm monitor

and then plugging the device in.

Regards,
   Antonio

-- 
Antonio Ospite
http://ao2.it

PGP public key ID: 0x4553B001

A: Because it messes up the order in which people normally read text.
   See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?