static int cpcap_battery_get_property()

in supply/cpcap-battery.c [556:709]

• 147 lines of code
• 43 McCabe index (conditional complexity)

static int cpcap_battery_get_property(struct power_supply *psy,
				      enum power_supply_property psp,
				      union power_supply_propval *val)
{
	struct cpcap_battery_ddata *ddata = power_supply_get_drvdata(psy);
	struct cpcap_battery_state_data *latest, *previous, *empty;
	u32 sample;
	s32 accumulator;
	int cached;
	s64 tmp;

	cached = cpcap_battery_update_status(ddata);
	if (cached < 0)
		return cached;

	latest = cpcap_battery_latest(ddata);
	previous = cpcap_battery_previous(ddata);

	switch (psp) {
	case POWER_SUPPLY_PROP_PRESENT:
		if (latest->temperature > CPCAP_NO_BATTERY || ignore_temperature_probe)
			val->intval = 1;
		else
			val->intval = 0;
		break;
	case POWER_SUPPLY_PROP_STATUS:
		if (cpcap_battery_full(ddata)) {
			val->intval = POWER_SUPPLY_STATUS_FULL;
			break;
		}
		if (cpcap_battery_cc_get_avg_current(ddata) < 0)
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = ddata->config.info.technology;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = cpcap_battery_get_voltage(ddata);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
		val->intval = ddata->config.info.voltage_max_design;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		val->intval = ddata->config.info.voltage_min_design;
		break;
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
		val->intval = ddata->config.bat.constant_charge_voltage_max_uv;
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
		sample = latest->cc.sample - previous->cc.sample;
		if (!sample) {
			val->intval = cpcap_battery_cc_get_avg_current(ddata);
			break;
		}
		accumulator = latest->cc.accumulator - previous->cc.accumulator;
		val->intval = cpcap_battery_cc_to_ua(ddata, sample,
						     accumulator,
						     latest->cc.offset);
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		val->intval = latest->current_ua;
		break;
	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
		val->intval = latest->counter_uah;
		break;
	case POWER_SUPPLY_PROP_POWER_NOW:
		tmp = (latest->voltage / 10000) * latest->current_ua;
		val->intval = div64_s64(tmp, 100);
		break;
	case POWER_SUPPLY_PROP_POWER_AVG:
		sample = latest->cc.sample - previous->cc.sample;
		if (!sample) {
			tmp = cpcap_battery_cc_get_avg_current(ddata);
			tmp *= (latest->voltage / 10000);
			val->intval = div64_s64(tmp, 100);
			break;
		}
		accumulator = latest->cc.accumulator - previous->cc.accumulator;
		tmp = cpcap_battery_cc_to_ua(ddata, sample, accumulator,
					     latest->cc.offset);
		tmp *= ((latest->voltage + previous->voltage) / 20000);
		val->intval = div64_s64(tmp, 100);
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		empty = cpcap_battery_get_empty(ddata);
		if (!empty->voltage || !ddata->charge_full)
			return -ENODATA;
		/* (ddata->charge_full / 200) is needed for rounding */
		val->intval = empty->counter_uah - latest->counter_uah +
			ddata->charge_full / 200;
		val->intval = clamp(val->intval, 0, ddata->charge_full);
		val->intval = val->intval * 100 / ddata->charge_full;
		break;
	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
		if (cpcap_battery_full(ddata))
			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
		else if (latest->voltage >= 3750000)
			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
		else if (latest->voltage >= 3300000)
			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
		else if (latest->voltage > 3100000)
			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
		else if (latest->voltage <= 3100000)
			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
		else
			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		empty = cpcap_battery_get_empty(ddata);
		if (!empty->voltage)
			return -ENODATA;
		val->intval = empty->counter_uah - latest->counter_uah;
		if (val->intval < 0) {
			/* Assume invalid config if CHARGE_NOW is -20% */
			if (ddata->charge_full && abs(val->intval) > ddata->charge_full/5) {
				empty->voltage = 0;
				ddata->charge_full = 0;
				return -ENODATA;
			}
			val->intval = 0;
		} else if (ddata->charge_full && ddata->charge_full < val->intval) {
			/* Assume invalid config if CHARGE_NOW exceeds CHARGE_FULL by 20% */
			if (val->intval > (6*ddata->charge_full)/5) {
				empty->voltage = 0;
				ddata->charge_full = 0;
				return -ENODATA;
			}
			val->intval = ddata->charge_full;
		}
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
		if (!ddata->charge_full)
			return -ENODATA;
		val->intval = ddata->charge_full;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
		val->intval = ddata->config.info.charge_full_design;
		break;
	case POWER_SUPPLY_PROP_SCOPE:
		val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
		break;
	case POWER_SUPPLY_PROP_TEMP:
		if (ignore_temperature_probe)
			return -ENODATA;
		val->intval = latest->temperature;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}