#!/bin/fish

if test (count $argv) -ne 2
    echo 'Usage: pci-bind <driver> <pciaddr>'
    exit 1
end

set req_driver $argv[1]
set pci_addr $argv[2]

set dev_paths /sys/bus/pci/devices/$pci_addr.*

function extract_error
    echo (string lower (string split ': ' "$argv")[-1])
end

function unbind
    for dev in $dev_paths
        if test -e $dev/driver
            echo (basename $dev) | tee $dev/driver/unbind > /dev/null 2>| read output

            if test -n "$output"
                echo "$dev: error unbinding" (extract_error "$output")
            end
        else
            echo "$dev: already unbound"
        end
    end
end

function bind
    for dev in $dev_paths
        echo (basename $dev) | tee /sys/bus/pci/drivers/$req_driver/bind > /dev/null 2>| read output

        if test -n "$output"
            set error_message (string split ': ' "$output")[-1]
            echo "$dev: error binding" (extract_error "$output")
        end
    end
end

unbind $dev_paths
bind $req_driver $dev_paths