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#!/bin/sh -e
# Read and control VCS rails by sending the UCD power sequencer I2C commands.
# This script assumes that the UCD is controlling VCS rails as GPIOs 5 and 6.
# Also assumes that those GPIOs are already enabled.
ucd_bus="0"
ucd_addr="0x64"
ucd_path="/sys/bus/i2c/drivers/ucd9000"
ucd_driver="${ucd_bus}-00${ucd_addr#0x}"
ucd_retries="5"
retry()
{
local i=0
until [ $i -ge $ucd_retries ]; do
i=$((i+1))
retry_output=`$@` && break
done
local ret=$?
if [ $i -eq $ucd_retries ]; then exit $ret; fi
}
# Usage: ucd_get address
# Result stored in $ucd_reg
ucd_get()
{
retry i2cget -f -y $ucd_bus $ucd_addr $1 b
ucd_reg=$retry_output
}
# Usage: ucd_get address value
ucd_set()
{
retry i2cset -f -y $ucd_bus $ucd_addr $1 $2 b
}
vcs_set_gpios()
{
echo -e "\tSetting UCD GPIO 5 to $1"
ucd_set 0xFA 5
ucd_set 0xFB $1
ucd_set 0xFB $1
echo -e "\tSetting UCD GPIO 6 to $1"
ucd_set 0xFA 6
ucd_set 0xFB $1
ucd_set 0xFB $1
}
vcs_get()
{
echo Reading VCS settings
ucd_set 0xFA 5
ucd_get 0xFB
local val=`echo $ucd_reg | grep -i -c 0x0f`
echo -e "\tUCD GPIO 5 state=$val"
ucd_set 0xFA 6
ucd_get 0xFB
local val=`echo $ucd_reg | grep -i -c 0x0f`
echo -e "\tUCD GPIO 6 state=$val"
}
if [ "$1" == "on" ]; then
echo Turning on VCS
vcs_set_gpios 0x7
elif [ "$1" == "off" ]; then
echo Turning off VCS
vcs_set_gpios 0x3
else
vcs_get
echo "$0 <on|off>" to set state
fi
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