If I call device_create with a existing class the device lands up in /sys/devices/virtual. Using device_add I could populate the parent of the device and leave the class empty or provide a class and get the device to be created in the parent directory.
What exactly is the significance of the" /sys/devices/virtual" directory? Is this meant to carry devices of a specific type say something that is divorced from actual hardware?
Secondly a device created under /sys/devices/virtual has a uevent file that is populated like this.
-bash-4.2$ cat uevent
MAJOR=13
MINOR=63
DEVNAME=input/mice
-bash-4.2$
MAJOR=13
MINOR=63
DEVNAME=input/mice
-bash-4.2$
A device in a specific PCI slot has something like this instead..
-bash-4.2$ cat /sys/devices/pci0000:00/0000:00:02.2/0000:03:00.3/net/eth1/uevent
INTERFACE=eth1
IFINDEX=3
INTERFACE=eth1
IFINDEX=3
How is this file populated? Is it done by udev or is this done via a kernel call?
Thanks
S
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