From 8aaba16047f903ca1b5ceb3eb60a64a4151efba7 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 26 Apr 2018 18:33:09 -0400
Subject: bin/hwmon: New script

---
(limited to 'bin')

diff --git a/bin/hwmon b/bin/hwmon
new file mode 100755
index 0000000..cc583c4
--- /dev/null
+++ b/bin/hwmon
@@ -0,0 +1,237 @@
+#!/bin/sh
+
+set -eu
+
+debug=0
+
+err()
+{
+	local fmt="${1}"
+	shift 1
+
+	printf "Error: ${fmt}\n" "${@}" 1>&2
+	return 0
+}
+
+dbg()
+{
+	local fmt="${1}"
+	shift 1
+
+	case "${debug}" in '1')
+		printf "DEBUG: ${fmt}\n" "${@}" 1>&2
+	esac
+
+	return 0
+}
+
+lookup_chips()
+{
+	local hwmon_dir=
+	local hwmon=
+	local name=
+
+	for hwmon_dir in /sys/class/hwmon/hwmon*; do
+		hwmon="${hwmon_dir#/sys/class/hwmon/}"
+		if [ -f "${hwmon_dir}/name" ]; then
+			read -r name <"${hwmon_dir}/name"
+		elif [ -f "${hwmon_dir}/device/name" ]; then
+			read -r name <"${hwmon_dir}/device/name"
+		else
+			return 1
+		fi
+		printf '%s %s\n' "${hwmon}" "${name}"
+		dbg 'Chip %s = %s' "${name}" "${hwmon}"
+	done
+
+	return 0
+}
+
+lookup_chip()
+{
+	local chip="${1}"
+	local chips="${2}"
+	shift 2
+	local hwmon=
+	local name=
+
+	while read -r hwmon name; do
+		case "${name}" in "${chip}")
+			printf '%s' "${hwmon}"
+			return 0
+		esac
+	done <<-EOF
+		${chips}
+		EOF
+
+	return 1
+}
+
+read_value()
+{
+	local hwmon="${1}"
+	local element="${2}"
+	shift 2
+	local hwmon_dir=
+	local value=
+
+	hwmon_dir="/sys/class/hwmon/${hwmon}"
+	if [ -f "${hwmon_dir}/${element}_input" ]; then
+		read -r value <"${hwmon_dir}/${element}_input"
+	elif [ -f "${hwmon_dir}/device/${element}_input" ]; then
+		read -r value <"${hwmon_dir}/device/${element}_input"
+	else
+		return 1
+	fi
+
+	printf '%s' "${value}"
+	return 0
+}
+
+format_temp()
+{
+	local hwmon="${1}"
+	local element="${2}"
+	shift 2
+	local value=
+
+	value="$(read_value "${hwmon}" "${element}")" || return 1
+	printf '%d C' "${value%???}"
+
+	return 0
+}
+
+format_fan()
+{
+	local hwmon="${1}"
+	local element="${2}"
+	shift 2
+	local value=
+
+	value="$(read_value "${hwmon}" "${element}")" || return 1
+	printf '%d RPM' "${value}"
+
+	return 0
+}
+
+format_power()
+{
+	local hwmon="${1}"
+	local element="${2}"
+	shift 2
+	local value=
+
+	value="$(read_value "${hwmon}" "${element}")" || return 1
+	printf '%d W' "${value%??????}"
+
+	return 0
+}
+
+print_sensor()
+{
+	local label="${1}"
+	local len=${2}
+	local chip="${3}"
+	local chips="${4}"
+	local element="${5}"
+	shift 5
+	local hwmon=
+	local value=
+	local i=
+
+	if ! hwmon="$(lookup_chip "${chip}" "${chips}")"; then
+		err 'Unknown chip "%s"' "${chip}"
+		return 1
+	fi
+
+	case "${element}" in
+		'temp'*)
+			value="$(format_temp "${hwmon}" "${element}")" || \
+				return 1
+			;;
+		'fan'*)
+			value="$(format_fan "${hwmon}" "${element}")" || \
+				return 1
+			;;
+		'power'*)
+			value="$(format_power "${hwmon}" "${element}")" || \
+				return 1
+			;;
+		*)
+			err 'Unsupported type of element "%s"' "${element}"
+			return 1
+			;;
+	esac
+
+	printf ' %s:' "${label}"
+	i=${#label}
+	while [ ${i} -lt ${len} ]; do
+		printf ' '
+		i=$((${i} + 1))
+	done
+	printf ' %s\n' "${value}"
+
+	return 0
+}
+
+usage()
+{
+	printf 'Usage: %s [-d] %s [%s ...]\n' "${0}" \
+		'<label>:<chip>/<element>' '<label>:<chip>/<element>'
+}
+
+main()
+{
+	local opt=
+	local chips=
+	local max_len=
+	local sensor=
+	local label=
+	local len=
+	local chip=
+	local element=
+
+	while getopts 'd' opt "${@}"; do
+		case "${opt}" in
+			'd') debug=1;;
+			'?')
+				usage 1>&2
+				return 1
+				;;
+		esac
+	done
+	shift $((${OPTIND} - 1))
+
+	if [ ${#} -lt 1 ]; then
+		usage 1>&2
+		return 1
+	fi
+
+	chips="$(lookup_chips)" || return 1
+
+	max_len=0
+	for sensor in "${@}"; do
+		label="${sensor%%:*}"
+		len=${#label}
+		if [ ${len} -gt ${max_len} ]; then
+			max_len=${len}
+		fi
+	done
+
+	for sensor in "${@}"; do
+		label="${sensor%%:*}"
+		sensor="${sensor#*:}"
+		case "${sensor}" in '')
+			printf '%s\n' "${label}"
+			continue
+		esac
+		chip="${sensor%/*}"
+		element="${sensor##*/}"
+		print_sensor "${label}" ${len} \
+			"${chip}" "${chips}" "${element}" || return 1
+	done
+
+	return 0
+}
+
+main "${@}"
--
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