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#
# Copyright 2020 Ettus Research, a National Instruments Brand
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
"""
Utilities for interfacing with ectool
"""
import subprocess
def run_cmd(cmd):
"""Run ectool utility's command named cmd."""
cmd_str = ' '.join(['ectool', cmd])
try:
output = subprocess.check_output(
cmd_str,
stderr=subprocess.STDOUT,
shell=True,
)
except subprocess.CalledProcessError as ex:
raise RuntimeError("Failed to execute {} ectool command".format(cmd))
return output.decode("utf-8")
def get_num_fans():
""" Run ectool utility's command pwmgetnumfans to get number of fans."""
output = run_cmd('pwmgetnumfans')
num_fans = [int(s) for s in output.split() if s.isdigit()][0]
return num_fans
def get_fan_rpm():
"""Run ectool utility's command pwmgetfanrpm to get fan rpm."""
num_fans = get_num_fans()
if num_fans == 0:
raise RuntimeError("Number of fans is zero.")
output = run_cmd('pwmgetfanrpm')
fan_rpm_info = [int(s) for s in output.split() if s.isdigit()]
if len(fan_rpm_info) == 2 * num_fans:
return {
"fan{}".format(fan) : fan_rpm_info[fan * 2 + 1]
for fan in range (0, num_fans)
}
else:
raise RuntimeError("Error getting fan rpm using ectool, at least one fan" \
" may be stalled. Command output: {}".format(output))
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