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statd: add pwm fan support

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Due to their nature we cannot read out the RPM of the pwm fans on the
BPi-R3.  But we can at least show it's alive, or steering out a signal
to the fan.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2025-11-30 17:16:21 +01:00
parent 5e62adae7e
commit fdb02895fb
2 changed files with 44 additions and 1 deletions
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src/statd/python/yanger/ietf_hardware.py
+31 -1
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@@ -297,7 +297,7 @@ def hwmon_sensor_components():
except (FileNotFoundError, ValueError, IOError):
continue
# Fan sensors
# Fan sensors (RPM from tachometer)
for fan_file in glob.glob(os.path.join(hwmon_path, "fan*_input")):
try:
sensor_num = os.path.basename(fan_file).split('_')[0].replace('fan', '')
@@ -314,6 +314,36 @@ def hwmon_sensor_components():
except (FileNotFoundError, ValueError, IOError):
continue
# PWM fan sensors (duty cycle percentage)
# Only add if no fan*_input exists for this device (avoid duplicates)
has_rpm_sensor = bool(glob.glob(os.path.join(hwmon_path, "fan*_input")))
if not has_rpm_sensor:
for pwm_file in glob.glob(os.path.join(hwmon_path, "pwm[0-9]*")):
# Skip pwm*_enable, pwm*_mode, etc. - only process pwm1, pwm2, etc.
pwm_basename = os.path.basename(pwm_file)
if not pwm_basename.replace('pwm', '').isdigit():
continue
try:
sensor_num = pwm_basename.replace('pwm', '')
pwm_raw = int(HOST.read(pwm_file).strip())
# Convert PWM duty cycle (0-255) to percentage (0-100)
# Note: Some devices are inverted (255=off, 0=max), but we report as-is
# The value represents duty cycle, not necessarily fan speed
# Use "other" value-type since PWM duty cycle isn't a standard IETF type
value = int((pwm_raw / 255.0) * 100 * 1000) # Convert to milli-percent (0-100000)
label_file = os.path.join(hwmon_path, f"pwm{sensor_num}_label")
raw_label = None
if HOST.exists(label_file):
raw_label = HOST.read(label_file).strip()
label = normalize_sensor_name(raw_label)
sensor_name = f"{base_name}-{label}"
else:
sensor_name = base_name if sensor_num == '1' else f"{base_name}{sensor_num}"
# Use "PWM Fan" as description so it displays nicely in show hardware
add_sensor(base_name, create_sensor(sensor_name, value, "other", "milli", raw_label or "PWM Fan"))
except (FileNotFoundError, ValueError, IOError):
continue
# Voltage sensors
for voltage_file in glob.glob(os.path.join(hwmon_path, "in*_input")):
try: