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install: Add i2c enabler to make-prep.sh #886

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Apr 19, 2018
Merged

install: Add i2c enabler to make-prep.sh #886

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39 changes: 39 additions & 0 deletions image/make-prep.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ SCRIPT_NAME=$(basename $0)
SCRIPT_DIR=$(dirname $0)
VERBOSE=0
ENABLE_CONSOLE=1
ENABLE_I2C=1
ENABLE_WIFI=0
WIFI_SSID=
WIFI_PASSWORD=
Expand All @@ -39,6 +40,7 @@ where OPTION can be one of:
--ssid SSID Specify the SSID for Wifi access
--password PWD Specify the password for wifi access
--wifi-country CC Specify the WiFi country code to use (default: GB)
--no-i2c Disable I2C bus
--hostname NAME Specify the hostname
--dd DEV Issue a dd command to copy the image to an sdcard
--summary Print summary of changed files
Expand Down Expand Up @@ -82,6 +84,35 @@ END
fi
}

###########################################################################
#
# Enables the I2C bus
#
enable_i2c_bus() {
CONFIG="${BOOT_MOUNTPOINT}/config.txt"
local pattern="dtparam=i2c_arm=on"
if grep -q "$pattern" ${CONFIG} ; then
sudo sed -i "s/.*$pattern/$pattern/g" "${CONFIG}"
else
echo "Enabling I2C bus"
sudo sh -c "cat >> '${CONFIG}'" <<END

$pattern
END
fi

CONF="${ROOT_MOUNTPOINT}/etc/modules"
if sudo grep -q "i2c-dev" "${CONF}:"; then
sudo sed -i "s/.*i2c-dev/i2c-dev/g" "${CONF}"
else
sudo sh -c "cat >> '${CONF}'" <<END

i2c-dev
END
fi
}


###########################################################################
#
# Enables SSH
Expand Down Expand Up @@ -211,6 +242,9 @@ main() {
HOSTNAME="${!OPTIND}"
OPTIND=$(( OPTIND + 1 ))
;;
no-i2c)
ENABLE_I2C=0
;;
noconsole)
ENABLE_CONSOLE=0
;;
Expand Down Expand Up @@ -285,6 +319,7 @@ main() {
echo " IMG_FILENAME = ${IMG_FILENAME}"
echo " PREP_FILENAME = ${PREP_FILENAME}"
echo "ENABLE_CONSOLE = ${ENABLE_CONSOLE}"
echo " ENABLE_I2C = ${ENABLE_I2C}"
echo " ENABLE_WIFI = ${ENABLE_WIFI}"
echo " WIFI_SSID = ${WIFI_SSID}"
echo " WIFI_PASSWORD = ${WIFI_PASSWORD}"
Expand Down Expand Up @@ -375,6 +410,10 @@ main() {
enable_serial_console
fi

if [ "${ENABLE_I2C}" == 1 ]; then
enable_i2c_bus
fi

if [ "${ENABLE_WIFI}" == 1 ]; then
enable_wifi
fi
Expand Down