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power: supply: sc27xx: Save last battery capacity

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Our charger manager can optimize the battery capacity periodically, so
we can save last battery capacity into registers. Then next system
power-on, we can read the last saved battery capacity as the initial
battery capacity, which can make the battery capacity more accurate.

Signed-off-by: Yuanjiang Yu <yuanjiang.yu@unisoc.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Yuanjiang Yu 2018-12-06 11:20:39 +08:00 committed by Sebastian Reichel
parent caa6e150f8
commit 4a040e7c72
1 changed files with 134 additions and 1 deletions
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135
drivers/power/supply/sc27xx_fuel_gauge.c
View file

@ -39,6 +39,9 @@
#define SC27XX_FGU_CLBCNT_VALH 0x68
#define SC27XX_FGU_CLBCNT_VALL 0x6c
#define SC27XX_FGU_CLBCNT_QMAXL 0x74
#define SC27XX_FGU_USER_AREA_SET 0xa0
#define SC27XX_FGU_USER_AREA_CLEAR 0xa4
#define SC27XX_FGU_USER_AREA_STATUS 0xa8
#define SC27XX_WRITE_SELCLB_EN BIT(0)
#define SC27XX_FGU_CLBCNT_MASK GENMASK(15, 0)
@ -49,6 +52,14 @@
#define SC27XX_FGU_LOW_OVERLOAD_INT BIT(0)
#define SC27XX_FGU_CLBCNT_DELTA_INT BIT(2)
#define SC27XX_FGU_MODE_AREA_MASK GENMASK(15, 12)
#define SC27XX_FGU_CAP_AREA_MASK GENMASK(11, 0)
#define SC27XX_FGU_MODE_AREA_SHIFT 12
#define SC27XX_FGU_FIRST_POWERTON GENMASK(3, 0)
#define SC27XX_FGU_DEFAULT_CAP GENMASK(11, 0)
#define SC27XX_FGU_NORMAIL_POWERTON 0x5
#define SC27XX_FGU_CUR_BASIC_ADC 8192
#define SC27XX_FGU_SAMPLE_HZ 2
@ -119,6 +130,80 @@ static int sc27xx_fgu_voltage_to_adc(struct sc27xx_fgu_data *data, int vol)
return DIV_ROUND_CLOSEST(vol * data->vol_1000mv_adc, 1000);
}
static bool sc27xx_fgu_is_first_poweron(struct sc27xx_fgu_data *data)
{
int ret, status, cap, mode;
ret = regmap_read(data->regmap,
data->base + SC27XX_FGU_USER_AREA_STATUS, &status);
if (ret)
return false;
/*
* We use low 4 bits to save the last battery capacity and high 12 bits
* to save the system boot mode.
*/
mode = (status & SC27XX_FGU_MODE_AREA_MASK) >> SC27XX_FGU_MODE_AREA_SHIFT;
cap = status & SC27XX_FGU_CAP_AREA_MASK;
/*
* When FGU has been powered down, the user area registers became
* default value (0xffff), which can be used to valid if the system is
* first power on or not.
*/
if (mode == SC27XX_FGU_FIRST_POWERTON || cap == SC27XX_FGU_DEFAULT_CAP)
return true;
return false;
}
static int sc27xx_fgu_save_boot_mode(struct sc27xx_fgu_data *data,
int boot_mode)
{
int ret;
ret = regmap_update_bits(data->regmap,
data->base + SC27XX_FGU_USER_AREA_CLEAR,
SC27XX_FGU_MODE_AREA_MASK,
SC27XX_FGU_MODE_AREA_MASK);
if (ret)
return ret;
return regmap_update_bits(data->regmap,
data->base + SC27XX_FGU_USER_AREA_SET,
SC27XX_FGU_MODE_AREA_MASK,
boot_mode << SC27XX_FGU_MODE_AREA_SHIFT);
}
static int sc27xx_fgu_save_last_cap(struct sc27xx_fgu_data *data, int cap)
{
int ret;
ret = regmap_update_bits(data->regmap,
data->base + SC27XX_FGU_USER_AREA_CLEAR,
SC27XX_FGU_CAP_AREA_MASK,
SC27XX_FGU_CAP_AREA_MASK);
if (ret)
return ret;
return regmap_update_bits(data->regmap,
data->base + SC27XX_FGU_USER_AREA_SET,
SC27XX_FGU_CAP_AREA_MASK, cap);
}
static int sc27xx_fgu_read_last_cap(struct sc27xx_fgu_data *data, int *cap)
{
int ret, value;
ret = regmap_read(data->regmap,
data->base + SC27XX_FGU_USER_AREA_STATUS, &value);
if (ret)
return ret;
*cap = value & SC27XX_FGU_CAP_AREA_MASK;
return 0;
}
/*
* When system boots on, we can not read battery capacity from coulomb
* registers, since now the coulomb registers are invalid. So we should
@ -128,6 +213,20 @@ static int sc27xx_fgu_voltage_to_adc(struct sc27xx_fgu_data *data, int vol)
static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap)
{
int volt, cur, oci, ocv, ret;
bool is_first_poweron = sc27xx_fgu_is_first_poweron(data);
/*
* If system is not the first power on, we should use the last saved
* battery capacity as the initial battery capacity. Otherwise we should
* re-calculate the initial battery capacity.
*/
if (!is_first_poweron) {
ret = sc27xx_fgu_read_last_cap(data, cap);
if (ret)
return ret;
return sc27xx_fgu_save_boot_mode(data, SC27XX_FGU_NORMAIL_POWERTON);
}
/*
* After system booting on, the SC27XX_FGU_CLBCNT_QMAXL register saved
@ -160,7 +259,11 @@ static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap)
*cap = power_supply_ocv2cap_simple(data->cap_table, data->table_len,
ocv);
return 0;
ret = sc27xx_fgu_save_last_cap(data, *cap);
if (ret)
return ret;
return sc27xx_fgu_save_boot_mode(data, SC27XX_FGU_NORMAIL_POWERTON);
}
static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt)
@ -418,6 +521,28 @@ static int sc27xx_fgu_get_property(struct power_supply *psy,
return ret;
}
static int sc27xx_fgu_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy);
int ret;
if (psp != POWER_SUPPLY_PROP_CAPACITY)
return -EINVAL;
mutex_lock(&data->lock);
ret = sc27xx_fgu_save_last_cap(data, val->intval);
mutex_unlock(&data->lock);
if (ret < 0)
dev_err(data->dev, "failed to save battery capacity\n");
return ret;
}
static void sc27xx_fgu_external_power_changed(struct power_supply *psy)
{
struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy);
@ -425,6 +550,12 @@ static void sc27xx_fgu_external_power_changed(struct power_supply *psy)
power_supply_changed(data->battery);
}
static int sc27xx_fgu_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
return psp == POWER_SUPPLY_PROP_CAPACITY;
}
static enum power_supply_property sc27xx_fgu_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
@ -444,7 +575,9 @@ static const struct power_supply_desc sc27xx_fgu_desc = {
.properties = sc27xx_fgu_props,
.num_properties = ARRAY_SIZE(sc27xx_fgu_props),
.get_property = sc27xx_fgu_get_property,
.set_property = sc27xx_fgu_set_property,
.external_power_changed = sc27xx_fgu_external_power_changed,
.property_is_writeable = sc27xx_fgu_property_is_writeable,
};
static void sc27xx_fgu_adjust_cap(struct sc27xx_fgu_data *data, int cap)