#!/bin/bash

dac_upd()
{
        V=`i2cget -y 1 0x48 "$1"`
        V=$(( (V & ~$2) | $3 ))
        i2cset -y 1 0x48 "$1" "$V"
}

#echo "$@" >> /tmp/botic_helper.log
#logger -p 0 "$@"

IFS=,
set -- $1

case "$1" in
	ctl_info)
		# fixed,min,max,step,tlv_type,tlv_a,tlb_b
		if [ "$2" = "MasterTrim Playback Volume" ]; then
			CI="1,0,0x7fffffff,0,2,-12000,0"
		else
			CI="1,-255,0,0,4,-12750,0"
		fi
		echo "$CI" > "/sys/$3"
		;;
	ctl_get)
		if [[ "$2" == "MasterTrim Playback Volume" ]]; then
			M1=$(i2cget -y 1 0x48 23)
			M2=$(i2cget -y 1 0x48 22)
			M3=$(i2cget -y 1 0x48 21)
			M4=$(i2cget -y 1 0x48 20)
			V="$M1${M2#0x}${M3#0x}${M4#0x}"
			echo "$V" > "/sys/$3"
		elif [[ "$2" =~ ^DAC([0-7])\ Playback\ Volume$ ]]; then
			R=${BASH_REMATCH[1]}
			# retrieve volume on the requested DAC
			V=$(i2cget -y 1 0x48 "$R")
			# add '-'
			echo "-$V" > "/sys/$3"
		else
			exit 1
		fi
		;;
	ctl_set)
		if [[ "$2" == "MasterTrim Playback Volume" ]]; then
			V=$(cat "/sys/$3")
			V=$(printf "%08x" "$V")
			i2cset -y 1 0x48 23 "0x${V:0:2}"
			i2cset -y 1 0x48 22 "0x${V:2:2}"
			i2cset -y 1 0x48 21 "0x${V:4:2}"
			i2cset -y 1 0x48 20 "0x${V:6:2}"
		elif [[ "$2" =~ ^DAC([0-7])\ Playback\ Volume$ ]]; then
			R=${BASH_REMATCH[1]}
			V=$(cat "/sys/$3")
			# remove '-'
			V=${V#-}
			# set volume on the requested DAC
			i2cset -y 1 0x48 "$R" "$V"
		else
			exit 1
		fi
		;;
	hw_params)
		# Example: hw_params,P,2,16385,96000,24576000,6144000,0,2,0,2,0,0
		# ${1}  - hw_params (operation name)
		# ${2}  - P (playback)
		# ${3}  - 2 (channels)
		# ${4}  - 16385 (dai format)
		# ${5}  - 96000 (freq)
		# ${6}  - 24576000 (mclk freq)
		# ${7}  - 6144000 (bclk freq)
		# ${8}  - 0 (this is not DSD stream)
		# ${9}  - 2 (number of data outputs ~ serconfig)
		# ${10} - 0 (# of the 1st output)
		# ${11} - 2 (# of the 2nd output)
		# ${12} - 0 (# of the 3rd output - not used here)
		# ${13} - 0 (# of the 4th output - not used here)

		### IIR bandwidth
		if [[ "${8}" == 0 ]]; then 
			dac_upd 14 0x6 0x0 # PCM normal
		else
			dac_upd 14 0x6 0x2 # DSD 50k
			#dac_upd 14 0x6 0x4 # DSD 60k
			#dac_upd 14 0x6 0x6 # DSD 70k
		fi
		;;
	*)
		;;
esac