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power: supply: sc27xx: Add fuel gauge low voltage alarm 

Add low voltage alarm support to make sure the battery capacity
more accurate in lower voltage stage.

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 2018-11-14 17:07:06 +08:00 committed by Sebastian Reichel
parent 65c9fab7bc
commit edcb1c0a3f
1 changed files with 170 additions and 1 deletions
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171
drivers/power/supply/sc27xx_fuel_gauge.c
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@ -31,8 +31,11 @@
#define SC27XX_FGU_OCV 0x24
#define SC27XX_FGU_POCV 0x28
#define SC27XX_FGU_CURRENT 0x2c
#define SC27XX_FGU_LOW_OVERLOAD 0x34
#define SC27XX_FGU_CLBCNT_SETH 0x50
#define SC27XX_FGU_CLBCNT_SETL 0x54
#define SC27XX_FGU_CLBCNT_DELTH 0x58
#define SC27XX_FGU_CLBCNT_DELTL 0x5c
#define SC27XX_FGU_CLBCNT_VALH 0x68
#define SC27XX_FGU_CLBCNT_VALL 0x6c
#define SC27XX_FGU_CLBCNT_QMAXL 0x74
@ -40,6 +43,11 @@
#define SC27XX_WRITE_SELCLB_EN BIT(0)
#define SC27XX_FGU_CLBCNT_MASK GENMASK(15, 0)
#define SC27XX_FGU_CLBCNT_SHIFT 16
#define SC27XX_FGU_LOW_OVERLOAD_MASK GENMASK(12, 0)
#define SC27XX_FGU_INT_MASK GENMASK(9, 0)
#define SC27XX_FGU_LOW_OVERLOAD_INT BIT(0)
#define SC27XX_FGU_CLBCNT_DELTA_INT BIT(2)
#define SC27XX_FGU_CUR_BASIC_ADC 8192
#define SC27XX_FGU_SAMPLE_HZ 2
@ -56,8 +64,10 @@
* @internal_resist: the battery internal resistance in mOhm
* @total_cap: the total capacity of the battery in mAh
* @init_cap: the initial capacity of the battery in mAh
* @alarm_cap: the alarm capacity
* @init_clbcnt: the initial coulomb counter
* @max_volt: the maximum constant input voltage in millivolt
* @min_volt: the minimum drained battery voltage in microvolt
* @table_len: the capacity table length
* @cur_1000ma_adc: ADC value corresponding to 1000 mA
* @vol_1000mv_adc: ADC value corresponding to 1000 mV
@ -75,14 +85,18 @@ struct sc27xx_fgu_data {
int internal_resist;
int total_cap;
int init_cap;
int alarm_cap;
int init_clbcnt;
int max_volt;
int min_volt;
int table_len;
int cur_1000ma_adc;
int vol_1000mv_adc;
struct power_supply_battery_ocv_table *cap_table;
};
static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity);
static const char * const sc27xx_charger_supply_name[] = {
"sc2731_charger",
"sc2720_charger",
@ -100,6 +114,11 @@ static int sc27xx_fgu_adc_to_voltage(struct sc27xx_fgu_data *data, int adc)
return DIV_ROUND_CLOSEST(adc * 1000, data->vol_1000mv_adc);
}
static int sc27xx_fgu_voltage_to_adc(struct sc27xx_fgu_data *data, int vol)
{
return DIV_ROUND_CLOSEST(vol * data->vol_1000mv_adc, 1000);
}
/*
* When system boots on, we can not read battery capacity from coulomb
* registers, since now the coulomb registers are invalid. So we should
@ -428,6 +447,92 @@ static const struct power_supply_desc sc27xx_fgu_desc = {
.external_power_changed = sc27xx_fgu_external_power_changed,
};
static void sc27xx_fgu_adjust_cap(struct sc27xx_fgu_data *data, int cap)
{
data->init_cap = cap;
data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap);
}
static irqreturn_t sc27xx_fgu_interrupt(int irq, void *dev_id)
{
struct sc27xx_fgu_data *data = dev_id;
int ret, cap, ocv, adc;
u32 status;
mutex_lock(&data->lock);
ret = regmap_read(data->regmap, data->base + SC27XX_FGU_INT_STS,
&status);
if (ret)
goto out;
ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_CLR,
status, status);
if (ret)
goto out;
/*
* When low overload voltage interrupt happens, we should calibrate the
* battery capacity in lower voltage stage.
*/
if (!(status & SC27XX_FGU_LOW_OVERLOAD_INT))
goto out;
ret = sc27xx_fgu_get_capacity(data, &cap);
if (ret)
goto out;
ret = sc27xx_fgu_get_vbat_ocv(data, &ocv);
if (ret)
goto out;
/*
* If current OCV value is less than the minimum OCV value in OCV table,
* which means now battery capacity is 0%, and we should adjust the
* inititial capacity to 0.
*/
if (ocv <= data->cap_table[data->table_len - 1].ocv) {
sc27xx_fgu_adjust_cap(data, 0);
} else if (ocv <= data->min_volt) {
/*
* If current OCV value is less than the low alarm voltage, but
* current capacity is larger than the alarm capacity, we should
* adjust the inititial capacity to alarm capacity.
*/
if (cap > data->alarm_cap) {
sc27xx_fgu_adjust_cap(data, data->alarm_cap);
} else if (cap <= 0) {
int cur_cap;
/*
* If current capacity is equal with 0 or less than 0
* (some error occurs), we should adjust inititial
* capacity to the capacity corresponding to current OCV
* value.
*/
cur_cap = power_supply_ocv2cap_simple(data->cap_table,
data->table_len,
ocv);
sc27xx_fgu_adjust_cap(data, cur_cap);
}
/*
* After adjusting the battery capacity, we should set the
* lowest alarm voltage instead.
*/
data->min_volt = data->cap_table[data->table_len - 1].ocv;
adc = sc27xx_fgu_voltage_to_adc(data, data->min_volt / 1000);
regmap_update_bits(data->regmap, data->base + SC27XX_FGU_LOW_OVERLOAD,
SC27XX_FGU_LOW_OVERLOAD_MASK, adc);
}
out:
mutex_unlock(&data->lock);
power_supply_changed(data->battery);
return IRQ_HANDLED;
}
static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id)
{
struct sc27xx_fgu_data *data = dev_id;
@ -509,7 +614,7 @@ static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data)
{
struct power_supply_battery_info info = { };
struct power_supply_battery_ocv_table *table;
int ret;
int ret, delta_clbcnt, alarm_adc;
ret = power_supply_get_battery_info(data->battery, &info);
if (ret) {
@ -520,6 +625,7 @@ static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data)
data->total_cap = info.charge_full_design_uah / 1000;
data->max_volt = info.constant_charge_voltage_max_uv / 1000;
data->internal_resist = info.factory_internal_resistance_uohm / 1000;
data->min_volt = info.voltage_min_design_uv;
/*
* For SC27XX fuel gauge device, we only use one ocv-capacity
@ -537,6 +643,10 @@ static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data)
return -ENOMEM;
}
data->alarm_cap = power_supply_ocv2cap_simple(data->cap_table,
data->table_len,
data->min_volt);
power_supply_put_battery_info(data->battery, &info);
ret = sc27xx_fgu_calibration(data);
@ -559,6 +669,50 @@ static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data)
goto disable_fgu;
}
ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_CLR,
SC27XX_FGU_INT_MASK, SC27XX_FGU_INT_MASK);
if (ret) {
dev_err(data->dev, "failed to clear interrupt status\n");
goto disable_clk;
}
/*
* Set the voltage low overload threshold, which means when the battery
* voltage is lower than this threshold, the controller will generate
* one interrupt to notify.
*/
alarm_adc = sc27xx_fgu_voltage_to_adc(data, data->min_volt / 1000);
ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_LOW_OVERLOAD,
SC27XX_FGU_LOW_OVERLOAD_MASK, alarm_adc);
if (ret) {
dev_err(data->dev, "failed to set fgu low overload\n");
goto disable_clk;
}
/*
* Set the coulomb counter delta threshold, that means when the coulomb
* counter change is multiples of the delta threshold, the controller
* will generate one interrupt to notify the users to update the battery
* capacity. Now we set the delta threshold as a counter value of 1%
* capacity.
*/
delta_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, 1);
ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_CLBCNT_DELTL,
SC27XX_FGU_CLBCNT_MASK, delta_clbcnt);
if (ret) {
dev_err(data->dev, "failed to set low delta coulomb counter\n");
goto disable_clk;
}
ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_CLBCNT_DELTH,
SC27XX_FGU_CLBCNT_MASK,
delta_clbcnt >> SC27XX_FGU_CLBCNT_SHIFT);
if (ret) {
dev_err(data->dev, "failed to set high delta coulomb counter\n");
goto disable_clk;
}
/*
* Get the boot battery capacity when system powers on, which is used to
* initialize the coulomb counter. After that, we can read the coulomb
@ -658,6 +812,21 @@ static int sc27xx_fgu_probe(struct platform_device *pdev)
return ret;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "no irq resource specified\n");
return irq;
}
ret = devm_request_threaded_irq(data->dev, irq, NULL,
sc27xx_fgu_interrupt,
IRQF_NO_SUSPEND | IRQF_ONESHOT,
pdev->name, data);
if (ret) {
dev_err(data->dev, "failed to request fgu IRQ\n");
return ret;
}
irq = gpiod_to_irq(data->gpiod);
if (irq < 0) {
dev_err(&pdev->dev, "failed to translate GPIO to IRQ\n");