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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>
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