| #!/bin/bash -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_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 "$1" |
| } |
| |
| vcs_get() |
| { |
| echo Reading VCS settings |
| ucd_set 0xFA 5 |
| ucd_get 0xFB |
| local val= |
| val=$(echo "$ucd_reg" | grep -i -c 0x0f) |
| echo -e "\tUCD GPIO 5 state=$val" |
| ucd_set 0xFA 6 |
| ucd_get 0xFB |
| 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 |