msm-uim-init

#!/sbin/openrc-run

# This script tries to automatically configure UIM application for Qualcomm QMI
# modems with more than one sim slot.

# Installation:
#
# sudo apk add libqmi
# wget https://gist.githubusercontent.com/TravMurav/90bdd89f492bc39004d8ffb3d722f771/raw/msm-uim-init
# chmod +x msm-uim-init
# sudo mv msm-uim-init /etc/init.d/
# sudo rc-update add msm-uim-init
#

name="UIM Slot selection"
description="Select UIM slot and application on the embedded QMI nodem."

depend() {
	need rmtfs
	before ofono
	before modemmanager

	# FIXME: This service may delay boot for some time, make sure that it
	# runs after UI and sshd so preceived boot time isn't affected.
	after tinydm
	after sshd
}

# All of the logic is placed in the service start method as we want to block
# other services while the modem isn't ready yet.
start() {
	# libqmi must be present to use this script.
	if ! [ -x "$(command -v qmicli)" ]
	then
		eend 1 'qmicli is not installed.'
		return 1
	fi

	# Prepare a qmicli command with desired modem path.
	# The modem may appear after some delay, wait for it.
	count=0
	while [ -z "$QMICLI_MODEM" ] && [ "$count" -lt "45" ]
	do
		# Check if legacy rpmsg exported device exists.
		if [ -e "/dev/modem" ]
		then
			QMICLI_MODEM="qmicli --silent -d /dev/modem"
			veinfo "Using /dev/modem"
		# Check if the qmi device from wwan driver exists.
		elif [ -e "/dev/wwan0qmi0" ]
		then
			QMICLI_MODEM="qmicli --silent -d /dev/wwan0qmi0 --device-open-qmi"
			veinfo "Using /dev/wwan0qmi0"
		# Check if QRTR is available for new devices.
		elif qmicli --silent -pd qrtr://0 --uim-noop > /dev/null
		then
			QMICLI_MODEM="qmicli --silent -pd qrtr://0"
			veinfo "Using qrtr://0"
		fi
		sleep 1
		count=$((count+1))
	done
	veinfo "Waited $count seconds for modem device to appear"

	if [ -z "$QMICLI_MODEM" ]
	then
		eend 2 'No modem available.'
		return 2
	fi

	QMI_CARDS=$($QMICLI_MODEM --uim-get-card-status)

	# Fail if all slots are empty but wait a bit for the sim to appear.
	count=0
	while ! printf "$QMI_CARDS" | grep -Fq "Card state: 'present'" && [ "$count" -lt "11" ]
	do
		sleep 1
		count=$((count+1))
		QMI_CARDS=$($QMICLI_MODEM --uim-get-card-status)
	done

	if [ "$count" -gt "10" ]
	then
		eend 4 'No sim present.'
		return 4
	fi
	veinfo "Waited $count seconds for modem to come up"

	# Clear the selected application in case the modem is in a bugged state
	if ! printf "$QMI_CARDS" | grep -Fq "Primary GW:   session doesn't exist"
	then
		ewarn 'Application was already selected.'
		$QMICLI_MODEM --uim-change-provisioning-session='activate=no,session-type=primary-gw-provisioning' > /dev/null
        fi

	# FIXME: There seems to be some race condition in some modem firmware
	# that makes it report "SIM missing" on legacy interface that
	# ModemManager uses. This causes MM to fail with same error despite UIM
	# being actually present. Keep the delay until MM stops using that
	# legacy interface.
	vewarn "Delaying modem init..."
	sleep 12

	# Extract first available slot number and AID for usim application
	# on it. This should select proper slot out of two if only one UIM is
	# present or select the first one if both slots have UIM's in them.
	FIRST_PRESENT_SLOT=$(printf "$QMI_CARDS" | grep "Card state: 'present'" -m1 -B1 | head -n1 | cut -c7-7)
	FIRST_PRESENT_AID=$(printf "$QMI_CARDS" | grep "usim (2)" -m1 -A3 | tail -n1 | awk '{print $1}')

	veinfo "Selecting $FIRST_PRESENT_AID on slot $FIRST_PRESENT_SLOT"

	# Finally send the new configuration to the modem.
	$QMICLI_MODEM --uim-change-provisioning-session="slot=$FIRST_PRESENT_SLOT,activate=yes,session-type=primary-gw-provisioning,aid=$FIRST_PRESENT_AID" > /dev/null
	eend $?
}