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power: supply: ab8500_fg: Use VBAT-to-Ri if possible 

Augment the AB8500 fuel gauge to use the VBAT-to-Ri method of
estimating the internal resistance if possible. Else fall back
to using the temperature-to-Ri or just the default Ri.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Linus Walleij 2022-02-26 00:27:59 +01:00 committed by Sebastian Reichel
parent e9e7d165b4
commit bc5d4a24ec
1 changed files with 21 additions and 10 deletions
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27
drivers/power/supply/ab8500_fg.c
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@ -877,27 +877,38 @@ static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di)
/**
* ab8500_fg_battery_resistance() - Returns the battery inner resistance
* @di: pointer to the ab8500_fg structure
* @vbat_uncomp_uv: Uncompensated VBAT voltage
*
* Returns battery inner resistance added with the fuel gauge resistor value
* to get the total resistance in the whole link from gnd to bat+ node
* in milliohm.
*/
static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
static int ab8500_fg_battery_resistance(struct ab8500_fg *di, int vbat_uncomp_uv)
{
struct power_supply_battery_info *bi = di->bm->bi;
int resistance_percent = 0;
int resistance;
/*
* Determine the resistance at this voltage. First try VBAT-to-Ri else
* just infer it from the surrounding temperature, if nothing works just
* use the internal resistance.
*/
if (power_supply_supports_vbat2ri(bi)) {
resistance = power_supply_vbat2ri(bi, vbat_uncomp_uv, di->flags.charging);
/* Convert to milliohm */
resistance = resistance / 1000;
} else if (power_supply_supports_temp2ri(bi)) {
resistance_percent = power_supply_temp2resist_simple(bi->resist_table,
bi->resist_table_size,
di->bat_temp / 10);
/*
* We get a percentage of factory resistance here so first get
* the factory resistance in milliohms then calculate how much
* resistance we have at this temperature.
*/
resistance = (bi->factory_internal_resistance_uohm / 1000);
/* Convert to milliohm */
resistance = bi->factory_internal_resistance_uohm / 1000;
resistance = resistance * resistance_percent / 100;
} else {
/* Last fallback */
resistance = bi->factory_internal_resistance_uohm / 1000;
}
dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
" fg resistance %d, total: %d (mOhm)\n",
@ -955,7 +966,7 @@ static int ab8500_load_comp_fg_bat_voltage(struct ab8500_fg *di, bool always)
vbat_uv = vbat_uv / i;
/* Next we apply voltage compensation from internal resistance */
rcomp = ab8500_fg_battery_resistance(di);
rcomp = ab8500_fg_battery_resistance(di, vbat_uv);
vbat_uv = vbat_uv - (di->inst_curr_ua * rcomp) / 1000;
/* Always keep this state at latest measurement */