static int nvme_hwmon_read()

in host/hwmon.c [66:113]

• 41 lines of code
• 8 McCabe index (conditional complexity)

static int nvme_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
			   u32 attr, int channel, long *val)
{
	struct nvme_hwmon_data *data = dev_get_drvdata(dev);
	struct nvme_smart_log *log = &data->log;
	int temp;
	int err;

	/*
	 * First handle attributes which don't require us to read
	 * the smart log.
	 */
	switch (attr) {
	case hwmon_temp_max:
		return nvme_get_temp_thresh(data->ctrl, channel, false, val);
	case hwmon_temp_min:
		return nvme_get_temp_thresh(data->ctrl, channel, true, val);
	case hwmon_temp_crit:
		*val = kelvin_to_millicelsius(data->ctrl->cctemp);
		return 0;
	default:
		break;
	}

	mutex_lock(&data->read_lock);
	err = nvme_hwmon_get_smart_log(data);
	if (err)
		goto unlock;

	switch (attr) {
	case hwmon_temp_input:
		if (!channel)
			temp = get_unaligned_le16(log->temperature);
		else
			temp = le16_to_cpu(log->temp_sensor[channel - 1]);
		*val = kelvin_to_millicelsius(temp);
		break;
	case hwmon_temp_alarm:
		*val = !!(log->critical_warning & NVME_SMART_CRIT_TEMPERATURE);
		break;
	default:
		err = -EOPNOTSUPP;
		break;
	}
unlock:
	mutex_unlock(&data->read_lock);
	return err;
}