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#!/bin/sh
# Copyright (C) 2016 Velocloud Inc
# Copyright (C) 2016 Aleksander Morgado <aleksander@aleksander.es>
################################################################################
. /lib/functions.sh
. /lib/netifd/netifd-proto.sh
################################################################################
# Runtime state
MODEMMANAGER_RUNDIR="/var/run/modemmanager"
MODEMMANAGER_PID_FILE="${MODEMMANAGER_RUNDIR}/modemmanager.pid"
MODEMMANAGER_CDCWDM_CACHE="${MODEMMANAGER_RUNDIR}/cdcwdm.cache"
MODEMMANAGER_SYSFS_CACHE="${MODEMMANAGER_RUNDIR}/sysfs.cache"
MODEMMANAGER_EVENTS_CACHE="${MODEMMANAGER_RUNDIR}/events.cache"
################################################################################
# Common logging
mm_log() {
logger -t "ModemManager" "hotplug: $*"
}
################################################################################
# Receives as input argument the full sysfs path of the device
# Returns the physical device sysfs path
#
# NOTE: this method only works when the device exists, i.e. it cannot be used
# on removal hotplug events
mm_find_physdev_sysfs_path() {
local tmp_path="$1"
while true; do
tmp_path=$(dirname "${tmp_path}")
# avoid infinite loops iterating
[ -z "${tmp_path}" ] || [ "${tmp_path}" = "/" ] && return
# the physical device will be that with a idVendor and idProduct pair of files
[ -f "${tmp_path}"/idVendor ] && [ -f "${tmp_path}"/idProduct ] && {
tmp_path=$(readlink -f "$tmp_path")
echo "${tmp_path}"
return
}
done
}
################################################################################
# Returns the cdc-wdm name retrieved from sysfs
mm_track_cdcwdm() {
local wwan="$1"
local cdcwdm
cdcwdm=$(ls "/sys/class/net/${wwan}/device/usbmisc/")
[ -n "${cdcwdm}" ] || return
# We have to cache it for later, as we won't be able to get the
# associated cdc-wdm device on a remove event
echo "${wwan} ${cdcwdm}" >> "${MODEMMANAGER_CDCWDM_CACHE}"
echo "${cdcwdm}"
}
# Returns the cdc-wdm name retrieved from the cache
mm_untrack_cdcwdm() {
local wwan="$1"
local cdcwdm
# Look for the cached associated cdc-wdm device
[ -f "${MODEMMANAGER_CDCWDM_CACHE}" ] || return
cdcwdm=$(awk -v wwan="${wwan}" '!/^#/ && $0 ~ wwan { print $2 }' "${MODEMMANAGER_CDCWDM_CACHE}")
[ -n "${cdcwdm}" ] || return
# Remove from cache
sed -i "/${wwan} ${cdcwdm}/d" "${MODEMMANAGER_CDCWDM_CACHE}"
echo "${cdcwdm}"
}
################################################################################
# ModemManager needs some time from the ports being added until a modem object
# is exposed in DBus. With the logic here we do an explicit wait of N seconds
# for ModemManager to expose the new modem object, making sure that the wait is
# unique per device (i.e. per physical device sysfs path).
# Gets the modem wait status as retrieved from the cache
mm_get_modem_wait_status() {
local sysfspath="$1"
# If no sysfs cache file, we're done
[ -f "${MODEMMANAGER_SYSFS_CACHE}" ] || return
# Get status of the sysfs path
awk -v sysfspath="${sysfspath}" '!/^#/ && $0 ~ sysfspath { print $2 }' "${MODEMMANAGER_SYSFS_CACHE}"
}
# Clear the modem wait status from the cache, if any
mm_clear_modem_wait_status() {
local sysfspath="$1"
local escaped_sysfspath
[ -f "${MODEMMANAGER_SYSFS_CACHE}" ] && {
# escape '/', '\' and '&' for sed...
escaped_sysfspath=$(echo "$sysfspath" | sed -e 's/[\/&]/\\&/g')
sed -i "/${escaped_sysfspath}/d" "${MODEMMANAGER_SYSFS_CACHE}"
}
}
# Sets the modem wait status in the cache
mm_set_modem_wait_status() {
local sysfspath="$1"
local status="$2"
# Remove sysfs line before adding the new one with the new state
mm_clear_modem_wait_status "${sysfspath}"
# Add the new status
echo "${sysfspath} ${status}" >> "${MODEMMANAGER_SYSFS_CACHE}"
}
# Callback for config_foreach()
mm_get_modem_config_foreach_cb() {
local cfg="$1"
local sysfspath="$2"
local proto
config_get proto "${cfg}" proto
[ "${proto}" = modemmanager ] || return 0
local dev
dev=$(uci_get network "${cfg}" device)
[ "${dev}" = "${sysfspath}" ] || return 0
echo "${cfg}"
}
# Returns the name of the interface configured for this device
mm_get_modem_config() {
local sysfspath="$1"
# Look for configuration for the given sysfs path
config_load network
config_foreach mm_get_modem_config_foreach_cb interface "${sysfspath}"
}
# Wait for a modem in the specified sysfspath
mm_wait_for_modem() {
local cfg="$1"
local sysfspath="$2"
# TODO: config max wait
local n=45
local step=5
while [ $n -ge 0 ]; do
[ -d "${sysfspath}" ] || {
mm_log "error: ignoring modem detection request: no device at ${sysfspath}"
proto_set_available "${cfg}" 0
return 1
}
# Check if the modem exists at the given sysfs path
if ! mmcli -m "${sysfspath}" > /dev/null 2>&1
then
mm_log "error: modem not detected at sysfs path"
else
mm_log "modem exported successfully at ${sysfspath}"
mm_log "setting interface '${cfg}' as available"
proto_set_available "${cfg}" 1
return 0
fi
sleep $step
n=$((n-step))
done
mm_log "error: timed out waiting for the modem to get exported at ${sysfspath}"
proto_set_available "${cfg}" 0
return 2
}
mm_report_modem_wait() {
local sysfspath=$1
local parent_sysfspath status
parent_sysfspath=$(mm_find_physdev_sysfs_path "$sysfspath")
[ -n "${parent_sysfspath}" ] || {
mm_log "error: parent device sysfspath not found"
return
}
status=$(mm_get_modem_wait_status "${parent_sysfspath}")
case "${status}" in
"")
local cfg
cfg=$(mm_get_modem_config "${parent_sysfspath}")
if [ -n "${cfg}" ]; then
mm_log "interface '${cfg}' is set to configure device '${parent_sysfspath}'"
mm_log "now waiting for modem at sysfs path ${parent_sysfspath}"
mm_set_modem_wait_status "${parent_sysfspath}" "processed"
# Launch subshell for the explicit wait
( mm_wait_for_modem "${cfg}" "${parent_sysfspath}" ) > /dev/null 2>&1 &
else
mm_log "no need to wait for modem at sysfs path ${parent_sysfspath}"
mm_set_modem_wait_status "${parent_sysfspath}" "ignored"
fi
;;
"processed")
mm_log "already waiting for modem at sysfs path ${parent_sysfspath}"
;;
"ignored")
;;
*)
mm_log "error: unknown status read for device at sysfs path ${parent_sysfspath}"
;;
esac
}
################################################################################
# Cleanup interfaces
mm_cleanup_interface_cb() {
local cfg="$1"
local proto
config_get proto "${cfg}" proto
[ "${proto}" = modemmanager ] || return 0
proto_set_available "${cfg}" 0
}
mm_cleanup_interfaces() {
config_load network
config_foreach mm_cleanup_interface_cb interface
}
mm_cleanup_interface_by_sysfspath() {
local dev="$1"
local cfg
cfg=$(mm_get_modem_config "$dev")
[ -n "${cfg}" ] || return
mm_log "setting interface '$cfg' as unavailable"
proto_set_available "${cfg}" 0
}
################################################################################
# Event reporting
# Receives as input the action, the device name and the subsystem
mm_report_event() {
local action="$1"
local name="$2"
local subsystem="$3"
local sysfspath="$4"
# Track/untrack events in cache
case "${action}" in
"add")
# On add events, store event details in cache (if not exists yet)
grep -qs "${name},${subsystem}" "${MODEMMANAGER_EVENTS_CACHE}" || \
echo "${action},${name},${subsystem},${sysfspath}" >> "${MODEMMANAGER_EVENTS_CACHE}"
;;
"remove")
# On remove events, remove old events from cache (match by subsystem+name)
sed -i "/${name},${subsystem}/d" "${MODEMMANAGER_EVENTS_CACHE}"
;;
esac
# Report the event
mm_log "event reported: action=${action}, name=${name}, subsystem=${subsystem}"
mmcli --report-kernel-event="action=${action},name=${name},subsystem=${subsystem}" 1>/dev/null 2>&1 &
# Wait for added modem if a sysfspath is given
[ -n "${sysfspath}" ] && [ "$action" = "add" ] && mm_report_modem_wait "${sysfspath}"
}
mm_report_event_from_cache_line() {
local event_line="$1"
local action name subsystem sysfspath
action=$(echo "${event_line}" | awk -F ',' '{ print $1 }')
name=$(echo "${event_line}" | awk -F ',' '{ print $2 }')
subsystem=$(echo "${event_line}" | awk -F ',' '{ print $3 }')
sysfspath=$(echo "${event_line}" | awk -F ',' '{ print $4 }')
mm_log "cached event found: action=${action}, name=${name}, subsystem=${subsystem}, sysfspath=${sysfspath}"
mm_report_event "${action}" "${name}" "${subsystem}" "${sysfspath}"
}
mm_report_events_from_cache() {
# Remove the sysfs cache
rm -f "${MODEMMANAGER_SYSFS_CACHE}"
local n=10
local step=1
local mmrunning=0
# Wait for ModemManager to be available in the bus
while [ $n -ge 0 ]; do
sleep $step
mm_log "checking if ModemManager is available..."
if ! mmcli -L >/dev/null 2>&1
then
mm_log "ModemManager not yet available"
else
mmrunning=1
break
fi
n=$((n-step))
done
[ ${mmrunning} -eq 1 ] || {
mm_log "error: couldn't report initial kernel events: ModemManager not running"
return
}
# Report cached kernel events
while IFS= read -r event_line; do
mm_report_event_from_cache_line "${event_line}"
done < ${MODEMMANAGER_EVENTS_CACHE}
}