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#!/bin/sh -eu
if ! lsmod | grep i2c_dev >/dev/null 2>&1; then
echo "kernel module i2c-dev must be loaded"
exit
fi
if ! command -v i2cdump >/dev/null 2>&1; then
echo "i2cdump from i2c-tools must be installed"
exit
fi
for connector in $(find /sys/class/drm/ -maxdepth 1 -name 'card[0-9]-*'); do
bus=$(find "$connector/" -maxdepth 1 -mindepth 1 -type d -name 'i2c-*' -print -quit | sed -n 's/.*\/i2c\-\(.*\)/\1/p')
if [ "$bus" = "" ]; then
bus=$(find "$connector/ddc/i2c-dev/" -maxdepth 1 -mindepth 1 -type d -name 'i2c-*' -print -quit | sed -n 's/.*\/i2c\-\(.*\)/\1/p')
fi
if [ "$bus" = "" ]; then
echo "Connector $(basename $connector) does not have an i2c bus. Skipping."
continue
fi
echo "Dumping connector $(basename $connector) i2c bus address 0x50"
i2cdump -y $bus 0x50 b
echo "Dumping connector $(basename $connector) i2c bus address 0x51"
i2cdump -y $bus 0x51 b
echo "Dumping connector $(basename $connector) i2c bus address 0x54"
i2cdump -y $bus 0x54 b
echo "Dumping connector $(basename $connector) i2c bus address 0x55"
i2cdump -y $bus 0x55 b
done
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