Add a small utility for retrieving sysfs bus path

From: Mauro Carvalho Chehab <mchehab@redhat.com>

Thanks to Carsten Meier <cm@trexity.de> for providing us a c++ code
snippet for USB.

This code is capable of getting the bus info for both USB and PCI
devices. This is retrieved via bus_info returned by VIDIOC_QUERYCAP.

The utility will output the following info for a usb device:
bus info = usb-0000:00:1d.7-1
bus path = /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1

And, for PCI devices, it will output:
bus info = PCI:0000:01:02.0
bus path = /sys/devices/pci0000:00/0000:00:1e.0/0000:01:02.0

Notice: This will only work for devices that uses the standard
notation for the bus info:

on PCI:
        sprintf(cap->bus_info, "PCI:%s", pci_name(dev->pci));
or
        sprintf(cap->bus_info, "PCIe:%s", pci_name(dev->pci));

on USB:
	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));

Priority: normal

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

0 files changed, 0 insertions, 0 deletions