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