power: supply: bq25890: Reduce reported CONSTANT_CHARGE_CURRENT_MAX for low temperatures

Take into account possible current reduction due to low-temperature when
reading POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX. As described in
the datasheet in cool (0-20° Celcius) conditions the current limit is
decreased to 20% or 50% of ICHG field value depended on JEITA_ISET field.

Also add NTC_FAULT field value to the debug message in
bq25890_get_chip_state().

Changed by Hans de Goede:
- Fix reading F_CHG_FAULT instead of F_NTC_FIELD for state->ntc_fault
- Only read JEITA_ISET field if necessary
- Tweak commit message a bit

Signed-off-by: Yauhen Kharuzhy <jekhor@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Co-developed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index fb987579d05a737dc6ea243fc464ea5d6d3d9f37..7a3269c06b38164117948e5e40bce9e29892a5ce 100644 (file)
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -94,6 +94,7 @@ struct bq25890_state {
        u8 vsys_status;
        u8 boost_fault;
        u8 bat_fault;
+       u8 ntc_fault;
 };
 
 struct bq25890_device {
@@ -407,6 +408,14 @@ enum bq25890_chrg_fault {
        CHRG_FAULT_TIMER_EXPIRED,
 };
 
+enum bq25890_ntc_fault {
+       NTC_FAULT_NORMAL = 0,
+       NTC_FAULT_WARM = 2,
+       NTC_FAULT_COOL = 3,
+       NTC_FAULT_COLD = 5,
+       NTC_FAULT_HOT = 6,
+};
+
 static bool bq25890_is_adc_property(enum power_supply_property psp)
 {
        switch (psp) {
@@ -499,6 +508,18 @@ static int bq25890_power_supply_get_property(struct power_supply *psy,
 
        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
                val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG);
+
+               /* When temperature is too low, charge current is decreased */
+               if (bq->state.ntc_fault == NTC_FAULT_COOL) {
+                       ret = bq25890_field_read(bq, F_JEITA_ISET);
+                       if (ret < 0)
+                               return ret;
+
+                       if (ret)
+                               val->intval /= 5;
+                       else
+                               val->intval /= 2;
+               }
                break;
 
        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
@@ -583,7 +604,8 @@ static int bq25890_get_chip_state(struct bq25890_device *bq,
                {F_VSYS_STAT,   &state->vsys_status},
                {F_BOOST_FAULT, &state->boost_fault},
                {F_BAT_FAULT,   &state->bat_fault},
-               {F_CHG_FAULT,   &state->chrg_fault}
+               {F_CHG_FAULT,   &state->chrg_fault},
+               {F_NTC_FAULT,   &state->ntc_fault}
        };
 
        for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
@@ -594,9 +616,10 @@ static int bq25890_get_chip_state(struct bq25890_device *bq,
                *state_fields[i].data = ret;
        }
 
-       dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
+       dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT/NTC=%d/%d/%d/%d\n",
                state->chrg_status, state->online, state->vsys_status,
-               state->chrg_fault, state->boost_fault, state->bat_fault);
+               state->chrg_fault, state->boost_fault, state->bat_fault,
+               state->ntc_fault);
 
        return 0;
 }