static int bd99955_reset_to_zero(void)
{
int rv;
rv = charger_set_current(0);
if (rv)
return rv;
return charger_set_voltage(0);
}
/**
* Enable or disable charging, and set requested voltage and current. If either
* of voltage and current is set to 0, charging is disable.
*
* @param voltage Requested voltage in mV. Set -1 to preserve current value.
* @param current Requested current in mA. Set -1 to preserve current value.
*/
static int charge_request(int voltage, int current)
{
int rv = EC_SUCCESS;
if (voltage == -1 && current == -1)
return EC_SUCCESS;
#ifdef CONFIG_CHARGER_EN_GPIO
if (voltage == 0 || current == 0) {
charge_set_charger_en_gpio(0);
return EC_SUCCESS;
} else {
charge_set_charger_en_gpio(1);
}
#endif
if (voltage != -1)
rv |= charger_set_voltage(voltage);
if (current != -1)
rv |= charger_set_current(current);
return rv;
}
/*
* Ask the charger for some voltage and current. If either value is 0,
* charging is disabled; otherwise it's enabled. Negative values are ignored.
*/
static int charge_request(int voltage, int current)
{
int r1 = EC_SUCCESS, r2 = EC_SUCCESS, r3 = EC_SUCCESS;
static int __bss_slow prev_volt, prev_curr;
if (!voltage || !current) {
#ifdef CONFIG_CHARGER_NARROW_VDC
current = 0;
/* With NVDC charger, keep VSYS voltage higher than battery */
voltage = charger_closest_voltage(
curr.batt.voltage + charger_get_info()->voltage_step);
/* If the battery is full, request the max voltage. */
if (is_full)
voltage = battery_get_info()->voltage_max;
/* And handle dead battery case */
voltage = MAX(voltage, battery_get_info()->voltage_min);
#else
voltage = current = 0;
#endif
}
if (curr.ac) {
if (prev_volt != voltage || prev_curr != current)
CPRINTS("%s(%dmV, %dmA)", __func__, voltage, current);
}
/*
* Set current before voltage so that if we are just starting
* to charge, we allow some time (i2c delay) for charging circuit to
* start at a voltage just above battery voltage before jumping
* up. This helps avoid large current spikes when connecting
* battery.
*/
if (current >= 0)
r2 = charger_set_current(current);
if (r2 != EC_SUCCESS)
problem(PR_SET_CURRENT, r2);
if (voltage >= 0)
r1 = charger_set_voltage(voltage);
if (r1 != EC_SUCCESS)
problem(PR_SET_VOLTAGE, r1);
/*
* Set the charge inhibit bit when possible as it appears to save
* power in some cases (e.g. Nyan with BQ24735).
*/
#if defined(CONFIG_CHARGER_BD99955) || defined(CONFIG_CHARGER_BD99956)
/* Charger auto exits from battery learn mode if charge inhibited */
if (current > 0 || chg_ctl_mode == CHARGE_CONTROL_DISCHARGE)
#else
if (voltage > 0 || current > 0)
#endif
r3 = charger_set_mode(0);
else
r3 = charger_set_mode(CHARGE_FLAG_INHIBIT_CHARGE);
if (r3 != EC_SUCCESS)
problem(PR_SET_MODE, r3);
/*
* Only update if the request worked, so we'll keep trying on failures.
*/
if (!r1 && !r2) {
prev_volt = voltage;
prev_curr = current;
}
return r1 ? r1 : r2;
}
