60 lines
1.2 KiB
Bash
Executable File
60 lines
1.2 KiB
Bash
Executable File
#!/bin/sh
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# Uncomment the following line to get debug info
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#set -x
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SELF="$(basename ${0})"
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SYSTEM_GPIO="/sys/class/gpio"
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# Power Audio Amplifier enable GPIO (('F' - 'A') * 32 + 6 = 166)
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GPIO_PF6=166
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usage() {
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>2& echo "Usage: ${SELF} [1|on|ON|On for ON, 0|off|OFF|Off for OFF]"
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exit 1
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}
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# Check number of arguments
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if [ ${#} -ne 1 ]; then
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usage
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fi
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case "${1}" in
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1|on|ON|On)
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# Turn ON only if volume is not null
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if [ "$(volume get)" -ne "0" ]; then
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echo "Turning audio amplifier ON"
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else
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exit 0
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fi
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new_state=1
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;;
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0|off|OFF|Off)
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echo "Turning audio amplifier OFF"
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new_state=0
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;;
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*)
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usage
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;;
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esac
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# Export the GPIO if necessary
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if [ ! -d "${SYSTEM_GPIO}/gpio${GPIO_PF6}" ]; then
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echo ${GPIO_PF6} > "${SYSTEM_GPIO}/export"
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fi
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# Set the power audio amplifier GPIO as output
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echo "out" > "${SYSTEM_GPIO}/gpio${GPIO_PF6}/direction"
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# Read the current power audio amplifier state
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current_state=$(cat "${SYSTEM_GPIO}/gpio${GPIO_PF6}/value")
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# Enable/disable the power audio amplifier if necessary
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if [ ${current_state} -ne ${new_state} ]; then
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echo ${new_state} > "${SYSTEM_GPIO}/gpio${GPIO_PF6}/value"
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fi
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exit 0
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