| Message ID | e7c061535f2dcca54d6498405fdd5ed7098b19f9.1539915051.git.baolin.wang@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v5,1/6] dt-bindings: power: Introduce one property to present the battery internal resistance | expand |
Hi, On Fri, Oct 19, 2018 at 06:53:11PM +0800, Baolin Wang wrote: > Add one field for 'struct power_supply_battery_info' to present the battery > factory internal resistance. > > Signed-off-by: Baolin Wang <baolin.wang@linaro.org> > Reviewed-by: Linus Walleij <linus.walleij@linaro.org> > --- Looks good to me. -- Sebastian > Changes from v4: > - None. > > Changes from v3: > - New patch in v3, which splits code into one separate patch. > - Add Linusw reviewed tag. > --- > drivers/power/supply/power_supply_core.c | 3 +++ > include/linux/power_supply.h | 1 + > 2 files changed, 4 insertions(+) > > diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c > index e853618..307e0995 100644 > --- a/drivers/power/supply/power_supply_core.c > +++ b/drivers/power/supply/power_supply_core.c > @@ -579,6 +579,7 @@ int power_supply_get_battery_info(struct power_supply *psy, > info->charge_term_current_ua = -EINVAL; > info->constant_charge_current_max_ua = -EINVAL; > info->constant_charge_voltage_max_uv = -EINVAL; > + info->factory_internal_resistance_uohm = -EINVAL; > > if (!psy->of_node) { > dev_warn(&psy->dev, "%s currently only supports devicetree\n", > @@ -616,6 +617,8 @@ int power_supply_get_battery_info(struct power_supply *psy, > &info->constant_charge_current_max_ua); > of_property_read_u32(battery_np, "constant_charge_voltage_max_microvolt", > &info->constant_charge_voltage_max_uv); > + of_property_read_u32(battery_np, "factory-internal-resistance-micro-ohms", > + &info->factory_internal_resistance_uohm); > > return 0; > } > diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h > index f807691..d089566 100644 > --- a/include/linux/power_supply.h > +++ b/include/linux/power_supply.h > @@ -326,6 +326,7 @@ struct power_supply_battery_info { > int charge_term_current_ua; /* microAmps */ > int constant_charge_current_max_ua; /* microAmps */ > int constant_charge_voltage_max_uv; /* microVolts */ > + int factory_internal_resistance_uohm; /* microOhms */ > }; > > extern struct atomic_notifier_head power_supply_notifier; > -- > 1.7.9.5 >
Hi Sebastian, On 22 October 2018 at 00:52, Sebastian Reichel <sre@kernel.org> wrote: > Hi, > > On Fri, Oct 19, 2018 at 06:53:15PM +0800, Baolin Wang wrote: >> This patch adds the Spreadtrum SC27XX serial PMICs fuel gauge support, >> which is used to calculate the battery capacity. >> >> Original-by: Yuanjiang Yu <yuanjiang.yu@unisoc.com> >> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> >> Acked-by: Linus Walleij <linus.walleij@linaro.org> >> --- > > Looks mostly good. I have a few comments still. My plan is to merge > this early after the merge window, if the final version is finished > at this point. > >> Changes from v4: >> - None. >> >> Changes from v3: >> - None. >> >> Changes from v2: >> - Use core helper functions to look up OCV capacity table. >> - Use device_property_read_u32() instead of of_property_read_u32(). >> - Add acked tag from Linus. >> >> Changes from v1: >> - Use battery standard properties to get internal resistance and ocv table. >> - Change devm_gpiod_get_optional() to devm_gpiod_get(). >> - Add power_supply_changed() when detecting battery present change. >> - Return micro volts for sc27xx_fgu_get_vbat_ocv(). >> --- >> drivers/power/supply/Kconfig | 7 + >> drivers/power/supply/Makefile | 1 + >> drivers/power/supply/sc27xx_fuel_gauge.c | 661 ++++++++++++++++++++++++++++++ >> 3 files changed, 669 insertions(+) >> create mode 100644 drivers/power/supply/sc27xx_fuel_gauge.c >> >> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig >> index f27cf07..917f4b7 100644 >> --- a/drivers/power/supply/Kconfig >> +++ b/drivers/power/supply/Kconfig >> @@ -652,4 +652,11 @@ config CHARGER_SC2731 >> Say Y here to enable support for battery charging with SC2731 >> PMIC chips. >> >> +config FUEL_GAUGE_SC27XX >> + tristate "Spreadtrum SC27XX fuel gauge driver" >> + depends on MFD_SC27XX_PMIC || COMPILE_TEST >> + help >> + Say Y here to enable support for fuel gauge with SC27XX >> + PMIC chips. >> + >> endif # POWER_SUPPLY >> diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile >> index 767105b..b731c2a 100644 >> --- a/drivers/power/supply/Makefile >> +++ b/drivers/power/supply/Makefile >> @@ -86,3 +86,4 @@ obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o >> obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o >> obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o >> obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o >> +obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o >> diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c >> new file mode 100644 >> index 0000000..1c0b856 >> --- /dev/null >> +++ b/drivers/power/supply/sc27xx_fuel_gauge.c >> @@ -0,0 +1,661 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +// Copyright (C) 2018 Spreadtrum Communications Inc. >> + >> +#include <linux/gpio/consumer.h> >> +#include <linux/iio/consumer.h> >> +#include <linux/interrupt.h> >> +#include <linux/kernel.h> >> +#include <linux/module.h> >> +#include <linux/of.h> >> +#include <linux/platform_device.h> >> +#include <linux/power_supply.h> >> +#include <linux/regmap.h> >> + >> +/* PMIC global control registers definition */ >> +#define SC27XX_MODULE_EN0 0xc08 >> +#define SC27XX_CLK_EN0 0xc18 >> +#define SC27XX_FGU_EN BIT(7) >> +#define SC27XX_FGU_RTC_EN BIT(6) >> + >> +/* FGU registers definition */ >> +#define SC27XX_FGU_START 0x0 >> +#define SC27XX_FGU_CONFIG 0x4 >> +#define SC27XX_FGU_ADC_CONFIG 0x8 >> +#define SC27XX_FGU_STATUS 0xc >> +#define SC27XX_FGU_INT_EN 0x10 >> +#define SC27XX_FGU_INT_CLR 0x14 >> +#define SC27XX_FGU_INT_STS 0x1c >> +#define SC27XX_FGU_VOLTAGE 0x20 >> +#define SC27XX_FGU_OCV 0x24 >> +#define SC27XX_FGU_POCV 0x28 >> +#define SC27XX_FGU_CURRENT 0x2c >> +#define SC27XX_FGU_CLBCNT_SETH 0x50 >> +#define SC27XX_FGU_CLBCNT_SETL 0x54 >> +#define SC27XX_FGU_CLBCNT_VALH 0x68 >> +#define SC27XX_FGU_CLBCNT_VALL 0x6c >> +#define SC27XX_FGU_CLBCNT_QMAXL 0x74 >> + >> +#define SC27XX_WRITE_SELCLB_EN BIT(0) >> +#define SC27XX_FGU_CLBCNT_MASK GENMASK(15, 0) >> +#define SC27XX_FGU_CLBCNT_SHIFT 16 >> + >> +#define SC27XX_FGU_1000MV_ADC 686 >> +#define SC27XX_FGU_1000MA_ADC 1372 >> +#define SC27XX_FGU_CUR_BASIC_ADC 8192 >> +#define SC27XX_FGU_SAMPLE_HZ 2 >> + >> +/* >> + * struct sc27xx_fgu_data: describe the FGU device >> + * @regmap: regmap for register access >> + * @dev: platform device >> + * @battery: battery power supply >> + * @base: the base offset for the controller >> + * @lock: protect the structure >> + * @gpiod: GPIO for battery detection >> + * @channel: IIO channel to get battery temperature >> + * @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 >> + * @init_clbcnt: the initial coulomb counter >> + * @max_volt: the maximum constant input voltage in millivolt >> + * @table_len: the capacity table length >> + * @cap_table: capacity table with corresponding ocv >> + */ >> +struct sc27xx_fgu_data { >> + struct regmap *regmap; >> + struct device *dev; >> + struct power_supply *battery; >> + u32 base; >> + struct mutex lock; >> + struct gpio_desc *gpiod; >> + struct iio_channel *channel; >> + bool bat_present; >> + int internal_resist; >> + int total_cap; >> + int init_cap; >> + int init_clbcnt; >> + int max_volt; >> + int table_len; >> + struct power_supply_battery_ocv_table *cap_table; >> +}; >> + >> +static const char * const sc27xx_charger_supply_name[] = { >> + "sc2731_charger", >> + "sc2720_charger", >> + "sc2721_charger", >> + "sc2723_charger", >> +}; >> + >> +static int sc27xx_fgu_adc_to_current(int adc) >> +{ >> + return (adc * 1000) / SC27XX_FGU_1000MA_ADC; >> +} >> + >> +static int sc27xx_fgu_adc_to_voltage(int adc) >> +{ >> + return (adc * 1000) / SC27XX_FGU_1000MV_ADC; >> +} >> + >> +/* >> + * When system boots on, we can not read battery capacity from coulomb >> + * registers, since now the coulomb registers are invalid. So we should >> + * calculate the battery open circuit voltage, and get current battery >> + * capacity according to the capacity table. >> + */ >> +static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap) >> +{ >> + int volt, cur, oci, ocv, ret; >> + >> + /* >> + * After system booting on, the SC27XX_FGU_CLBCNT_QMAXL register saved >> + * the first sampled open circuit current. >> + */ >> + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_QMAXL, >> + &cur); >> + if (ret) >> + return ret; >> + >> + cur <<= 1; >> + oci = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); >> + >> + /* >> + * Should get the OCV from SC27XX_FGU_POCV register at the system >> + * beginning. It is ADC values reading from registers which need to >> + * convert the corresponding voltage. >> + */ >> + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_POCV, &volt); >> + if (ret) >> + return ret; >> + >> + volt = sc27xx_fgu_adc_to_voltage(volt); >> + ocv = volt - (oci * data->internal_resist) / 1000; >> + >> + /* >> + * Parse the capacity table to look up the correct capacity percent >> + * according to current battery's corresponding OCV values. >> + */ >> + *cap = power_supply_ocv2cap_simple(data->cap_table, data->table_len, >> + ocv); >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt) >> +{ >> + int ret; >> + >> + clbcnt *= SC27XX_FGU_SAMPLE_HZ; >> + >> + ret = regmap_update_bits(data->regmap, >> + data->base + SC27XX_FGU_CLBCNT_SETL, >> + SC27XX_FGU_CLBCNT_MASK, clbcnt); >> + if (ret) >> + return ret; >> + >> + ret = regmap_update_bits(data->regmap, >> + data->base + SC27XX_FGU_CLBCNT_SETH, >> + SC27XX_FGU_CLBCNT_MASK, >> + clbcnt >> SC27XX_FGU_CLBCNT_SHIFT); >> + if (ret) >> + return ret; >> + >> + return regmap_update_bits(data->regmap, data->base + SC27XX_FGU_START, >> + SC27XX_WRITE_SELCLB_EN, >> + SC27XX_WRITE_SELCLB_EN); >> +} >> + >> +static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt) >> +{ >> + int ccl, cch, ret; >> + >> + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALL, >> + &ccl); >> + if (ret) >> + return ret; >> + >> + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALH, >> + &cch); >> + if (ret) >> + return ret; >> + >> + *clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK; >> + *clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT; >> + *clb_cnt /= SC27XX_FGU_SAMPLE_HZ; >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap) >> +{ >> + int ret, cur_clbcnt, delta_clbcnt, delta_cap, temp; >> + >> + /* Get current coulomb counters firstly */ >> + ret = sc27xx_fgu_get_clbcnt(data, &cur_clbcnt); >> + if (ret) >> + return ret; >> + >> + delta_clbcnt = cur_clbcnt - data->init_clbcnt; >> + >> + /* >> + * Convert coulomb counter to delta capacity (mAh), and set multiplier >> + * as 100 to improve the precision. >> + */ >> + temp = DIV_ROUND_CLOSEST(delta_clbcnt, 360); >> + temp = sc27xx_fgu_adc_to_current(temp); >> + >> + /* >> + * Convert to capacity percent of the battery total capacity, >> + * and multiplier is 100 too. >> + */ >> + delta_cap = DIV_ROUND_CLOSEST(temp * 100, data->total_cap); >> + *cap = delta_cap + data->init_cap; >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_get_vbat_vol(struct sc27xx_fgu_data *data, int *val) >> +{ >> + int ret, vol; >> + >> + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE, &vol); >> + if (ret) >> + return ret; >> + >> + /* >> + * It is ADC values reading from registers which need to convert to >> + * corresponding voltage values. >> + */ >> + *val = sc27xx_fgu_adc_to_voltage(vol); >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_get_current(struct sc27xx_fgu_data *data, int *val) >> +{ >> + int ret, cur; >> + >> + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT, &cur); >> + if (ret) >> + return ret; >> + >> + /* >> + * It is ADC values reading from registers which need to convert to >> + * corresponding current values. >> + */ >> + *val = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val) >> +{ >> + int vol, cur, ret; >> + >> + ret = sc27xx_fgu_get_vbat_vol(data, &vol); >> + if (ret) >> + return ret; >> + >> + ret = sc27xx_fgu_get_current(data, &cur); >> + if (ret) >> + return ret; >> + >> + /* Return the battery OCV in micro volts. */ >> + *val = vol * 1000 - cur * data->internal_resist; >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp) >> +{ >> + return iio_read_channel_processed(data->channel, temp); >> +} >> + >> +static int sc27xx_fgu_get_health(struct sc27xx_fgu_data *data, int *health) >> +{ >> + int ret, vol; >> + >> + ret = sc27xx_fgu_get_vbat_vol(data, &vol); >> + if (ret) >> + return ret; >> + >> + if (vol > data->max_volt) >> + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; >> + else >> + *health = POWER_SUPPLY_HEALTH_GOOD; >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_get_status(struct sc27xx_fgu_data *data, int *status) >> +{ >> + union power_supply_propval val; >> + struct power_supply *psy; >> + int i, ret = -EINVAL; >> + >> + for (i = 0; i < ARRAY_SIZE(sc27xx_charger_supply_name); i++) { >> + psy = power_supply_get_by_name(sc27xx_charger_supply_name[i]); >> + if (!psy) >> + continue; >> + >> + ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, >> + &val); >> + power_supply_put(psy); >> + if (ret) >> + return ret; >> + >> + *status = val.intval; >> + } >> + >> + return ret; >> +} >> + >> +static int sc27xx_fgu_get_property(struct power_supply *psy, >> + enum power_supply_property psp, >> + union power_supply_propval *val) >> +{ >> + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); >> + int ret = 0; >> + int value; >> + >> + mutex_lock(&data->lock); >> + >> + switch (psp) { >> + case POWER_SUPPLY_PROP_STATUS: >> + ret = sc27xx_fgu_get_status(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value; >> + break; >> + >> + case POWER_SUPPLY_PROP_HEALTH: >> + ret = sc27xx_fgu_get_health(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value; >> + break; >> + >> + case POWER_SUPPLY_PROP_PRESENT: >> + val->intval = data->bat_present; >> + break; >> + >> + case POWER_SUPPLY_PROP_TEMP: >> + ret = sc27xx_fgu_get_temp(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value; >> + break; >> + >> + case POWER_SUPPLY_PROP_TECHNOLOGY: >> + val->intval = POWER_SUPPLY_TECHNOLOGY_LION; >> + break; >> + >> + case POWER_SUPPLY_PROP_CAPACITY: >> + ret = sc27xx_fgu_get_capacity(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value; >> + break; >> + >> + case POWER_SUPPLY_PROP_VOLTAGE_NOW: >> + ret = sc27xx_fgu_get_vbat_vol(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value * 1000; >> + break; >> + >> + case POWER_SUPPLY_PROP_VOLTAGE_OCV: >> + ret = sc27xx_fgu_get_vbat_ocv(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value; >> + break; >> + >> + case POWER_SUPPLY_PROP_CURRENT_NOW: >> + case POWER_SUPPLY_PROP_CURRENT_AVG: >> + ret = sc27xx_fgu_get_current(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value * 1000; >> + break; >> + >> + default: >> + ret = -EINVAL; >> + break; >> + } >> + >> +error: >> + mutex_unlock(&data->lock); >> + return ret; >> +} >> + >> +static void sc27xx_fgu_external_power_changed(struct power_supply *psy) >> +{ >> + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); >> + >> + power_supply_changed(data->battery); >> +} >> + >> +static enum power_supply_property sc27xx_fgu_props[] = { >> + POWER_SUPPLY_PROP_STATUS, >> + POWER_SUPPLY_PROP_HEALTH, >> + POWER_SUPPLY_PROP_PRESENT, >> + POWER_SUPPLY_PROP_TEMP, >> + POWER_SUPPLY_PROP_TECHNOLOGY, >> + POWER_SUPPLY_PROP_CAPACITY, >> + POWER_SUPPLY_PROP_VOLTAGE_NOW, >> + POWER_SUPPLY_PROP_VOLTAGE_OCV, >> + POWER_SUPPLY_PROP_CURRENT_NOW, >> + POWER_SUPPLY_PROP_CURRENT_AVG, >> +}; >> + >> +static const struct power_supply_desc sc27xx_fgu_desc = { >> + .name = "sc27xx-fgu", >> + .type = POWER_SUPPLY_TYPE_BATTERY, >> + .properties = sc27xx_fgu_props, >> + .num_properties = ARRAY_SIZE(sc27xx_fgu_props), >> + .get_property = sc27xx_fgu_get_property, >> + .external_power_changed = sc27xx_fgu_external_power_changed, >> +}; >> + >> +static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id) >> +{ >> + struct sc27xx_fgu_data *data = dev_id; >> + int state; >> + >> + mutex_lock(&data->lock); >> + >> + state = gpiod_get_value_cansleep(data->gpiod); >> + if (state < 0) { >> + dev_err(data->dev, "failed to get gpio state\n"); >> + mutex_unlock(&data->lock); >> + return IRQ_RETVAL(state); >> + } >> + >> + data->bat_present = !!state; >> + >> + mutex_unlock(&data->lock); >> + >> + power_supply_changed(data->battery); >> + return IRQ_HANDLED; >> +} >> + >> +static void sc27xx_fgu_disable(void *_data) >> +{ >> + struct sc27xx_fgu_data *data = _data; >> + >> + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); >> + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); >> +} >> + >> +static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity) >> +{ >> + /* >> + * Get current capacity (mAh) = battery total capacity (mAh) * >> + * current capacity percent (capacity / 100). >> + */ >> + int cur_cap = DIV_ROUND_CLOSEST(data->total_cap * capacity, 100); >> + >> + /* >> + * Convert current capacity (mAh) to coulomb counter according to the >> + * formula: 1 mAh =3.6 coulomb. >> + */ >> + return DIV_ROUND_CLOSEST(cur_cap * 36, 10); >> +} >> + >> +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, i; >> + >> + ret = power_supply_get_battery_info(data->battery, &info); >> + if (ret) { >> + dev_err(data->dev, "failed to get battery information\n"); >> + return ret; >> + } >> + >> + 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; >> + >> + /* >> + * For SC27XX fuel gauge device, we only use one ocv-capacity >> + * table in normal temperature 20 Celsius. >> + */ >> + table = power_supply_find_ocv2cap_table(&info, 20, &data->table_len); >> + if (!table) >> + return -EINVAL; >> + >> + data->cap_table = devm_kzalloc(data->dev, >> + data->table_len * sizeof(*table), >> + GFP_KERNEL); >> + if (!data->cap_table) { >> + power_supply_put_battery_info(data->battery, &info); >> + return -ENOMEM; >> + } >> + >> + for (i = 0; i < data->table_len; i++) { >> + data->cap_table[i].ocv = table[i].ocv / 1000; >> + data->cap_table[i].capacity = table[i].capacity; >> + } > > Don't divide the OCV by 1000. You feed this table into the > generic power-supply function later, which should always > get uV. Instead multiply the ocv parameter in your > power_supply_ocv2cap_simple() call with 1000. This > means you can just use devm_kmemdup() here. Good point. Will change it in next version. > > Some ideas for later (I'm fine with merging the driver > without these changes): > > * Store battery_info directly in private driver data > instead of doing a copy of the temperature table. > * Call power_supply_ocv2cap() with current battery > temperature and let the power-supply core figure > out which ocv-to-capacity curve should be used. I should keep my original method, since we have no temperature table now and only use one room temperature (20 degree). Thanks for your useful comments. -- Baolin Wang Best Regards
diff --git a/Documentation/devicetree/bindings/power/supply/battery.txt b/Documentation/devicetree/bindings/power/supply/battery.txt index f4d3b4a..938d027 100644 --- a/Documentation/devicetree/bindings/power/supply/battery.txt +++ b/Documentation/devicetree/bindings/power/supply/battery.txt @@ -22,6 +22,7 @@ Optional Properties: - charge-term-current-microamp: current for charge termination phase - constant-charge-current-max-microamp: maximum constant input current - constant-charge-voltage-max-microvolt: maximum constant input voltage + - factory-internal-resistance-micro-ohms: battery factory internal resistance Battery properties are named, where possible, for the corresponding elements in enum power_supply_property, defined in @@ -42,6 +43,7 @@ Example: charge-term-current-microamp = <128000>; constant-charge-current-max-microamp = <900000>; constant-charge-voltage-max-microvolt = <4200000>; + factory-internal-resistance-micro-ohms = <250000>; }; charger: charger@11 {