power: supply: sc27xx: Save last battery capacity (4a040e7c) · Commits · 戴 / test

drivers/power/supply/sc27xx_fuel_gauge.c

+134 −1

Original line number	Diff line number	Diff line
		@@ -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 @@ error:
		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)

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