Ttyjfyk

Just use /sys.

Example. I want to find the driver for my Ethernet card:

$ sudo lspci
...
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)
$ find /sys | grep drivers.*02:00
/sys/bus/pci/drivers/r8169/0000:02:00.0

That is r8169.

First I need to find coordinates of the device using lspci; then I find driver that is used for the devices with these coordinates.

Here's a little script I wrote:

#!/bin/bash
for f in /sys/class/net/*; do
 dev=$(basename $f)
 driver=$(readlink $f/device/driver/module)
 if [ $driver ]; then
 driver=$(basename $driver)
 fi
 addr=$(cat $f/address)
 operstate=$(cat $f/operstate)
 printf "%10s [%s]: %10s (%s)n" "$dev" "$addr" "$driver" "$operstate"
done

Sample output:

$ ~/what_eth_drivers.sh 
 eth0 [52:54:00:aa:bb:cc]: virtio_net (up)
 eth1 [52:54:00:dd:ee:ff]: virtio_net (up)
 eth2 [52:54:00:99:88:77]: virtio_net (up)
 lo [00:00:00:00:00:00]: (unknown)

sudo lspci -v will show it. like this:

$ sudo lspci -v
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc......
...
Kernel driver in use: radeon
Kernel modules: radeon

You can also combine it with grep like this:

$ sudo lspci -v | grep -A 20 VGA

If you just want to plainly use sysfs and doesn't want to deal with all these commands which eventually looks inside sysfs anyways, here's how:

say, what is the module/driver for eth6? "sfc" it is

# ls -l /sys/class/net/eth6/device/driver
lrwxrwxrwx 1 root root 0 Jan 22 12:30 /sys/class/net/eth6/device/driver ->
../../../../bus/pci/drivers/sfc

or better yet.. let readlink resolve the path for you.

# readlink -f /sys/class/net/eth6/device/driver
/sys/bus/pci/drivers/sfc 

so... to figure out what are the drivers for all of your network interfaces:

# ls -1 /sys/class/net/ | grep -v lo | xargs -n1 -I bash -c 'echo -n :" " ; basename `readlink -f /sys/class/net//device/driver`'

eth0 : tg3
eth1 : tg3
eth10 : mlx4_core
eth11 : mlx4_core
eth2 : tg3
eth3 : tg3
eth4 : mlx4_core
eth5 : mlx4_core
eth6 : sfc
eth7 : sfc
eth8 : sfc
eth9 : sfc

You can use the lsmod command to get the status of loaded modules / devices drivers in the Linux Kernel.

For a specific device, you can use dmesg |grep <device-name> to get the details too.

For USB based devices you can see the driver name by using the lsusb command:

lsusb -t

And/or you use lshw which enumerates the devices on all buses including USB, PCI, etc so you can see which driver it uses:

sudo lshw