diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index 47b7d2111c4e..331e1160e411 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -358,7 +358,7 @@ config AXP288_CHARGER config AXP288_FUEL_GAUGE tristate "X-Powers AXP288 Fuel Gauge" - depends on MFD_AXP20X && IIO + depends on MFD_AXP20X && IIO && IOSF_MBI help Say yes here to have support for X-Power power management IC (PMIC) Fuel Gauge. The device provides battery statistics and status diff --git a/drivers/power/supply/axp288_fuel_gauge.c b/drivers/power/supply/axp288_fuel_gauge.c index 8011628d3704..8db8ab0827e4 100644 --- a/drivers/power/supply/axp288_fuel_gauge.c +++ b/drivers/power/supply/axp288_fuel_gauge.c @@ -2,7 +2,8 @@ /* * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver * - * Copyright (C) 2016-2017 Hans de Goede + * Copyright (C) 2020-2021 Andrejus Basovas + * Copyright (C) 2016-2021 Hans de Goede * Copyright (C) 2014 Intel Corporation * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -20,6 +21,7 @@ #include #include #include +#include #define PS_STAT_VBUS_TRIGGER (1 << 0) #define PS_STAT_BAT_CHRG_DIR (1 << 2) @@ -84,6 +86,7 @@ #define PROP_VOLT(a) ((a) * 1000) #define PROP_CURR(a) ((a) * 1000) +#define AXP288_REG_UPDATE_INTERVAL (60 * HZ) #define AXP288_FG_INTR_NUM 6 enum { QWBTU_IRQ = 0, @@ -114,6 +117,18 @@ struct axp288_fg_info { int pwr_op; int low_cap; struct dentry *debug_file; + + char valid; /* zero until following fields are valid */ + unsigned long last_updated; /* in jiffies */ + + int pwr_stat; + int fg_res; + int bat_volt; + int d_curr; + int c_curr; + int ocv; + int fg_cc_mtr1; + int fg_des_cap1; }; static enum power_supply_property fuel_gauge_props[] = { @@ -192,25 +207,78 @@ static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg) return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f); } +static int fuel_gauge_update_registers(struct axp288_fg_info *info) +{ + int ret; + + if (info->valid && time_before(jiffies, info->last_updated + AXP288_REG_UPDATE_INTERVAL)) + return 0; + + dev_dbg(info->dev, "Fuel Gauge updating register values...\n"); + + ret = iosf_mbi_block_punit_i2c_access(); + if (ret < 0) + return ret; + + ret = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS); + if (ret < 0) + goto out; + info->pwr_stat = ret; + + ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES); + if (ret < 0) + goto out; + info->fg_res = ret; + + ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &info->bat_volt); + if (ret < 0) + goto out; + + if (info->pwr_stat & PS_STAT_BAT_CHRG_DIR) { + info->d_curr = 0; + ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &info->c_curr); + if (ret < 0) + goto out; + } else { + info->c_curr = 0; + ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &info->d_curr); + if (ret < 0) + goto out; + } + + ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG); + if (ret < 0) + goto out; + info->ocv = ret; + + ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG); + if (ret < 0) + goto out; + info->fg_cc_mtr1 = ret; + + ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG); + if (ret < 0) + goto out; + info->fg_des_cap1 = ret; + + info->last_updated = jiffies; + info->valid = 1; + ret = 0; +out: + iosf_mbi_unblock_punit_i2c_access(); + return ret; +} + static void fuel_gauge_get_status(struct axp288_fg_info *info) { - int pwr_stat, fg_res, curr, ret; - - pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS); - if (pwr_stat < 0) { - dev_err(info->dev, "PWR STAT read failed: %d\n", pwr_stat); - return; - } + int pwr_stat = info->pwr_stat; + int fg_res = info->fg_res; + int curr = info->d_curr; /* Report full if Vbus is valid and the reported capacity is 100% */ if (!(pwr_stat & PS_STAT_VBUS_VALID)) goto not_full; - fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES); - if (fg_res < 0) { - dev_err(info->dev, "FG RES read failed: %d\n", fg_res); - return; - } if (!(fg_res & FG_REP_CAP_VALID)) goto not_full; @@ -228,11 +296,6 @@ static void fuel_gauge_get_status(struct axp288_fg_info *info) if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR)) goto not_full; - ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &curr); - if (ret < 0) { - dev_err(info->dev, "FG get current failed: %d\n", ret); - return; - } if (curr == 0) { info->status = POWER_SUPPLY_STATUS_FULL; return; @@ -245,61 +308,16 @@ not_full: info->status = POWER_SUPPLY_STATUS_DISCHARGING; } -static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt) -{ - int ret = 0, raw_val; - - ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val); - if (ret < 0) - goto vbatt_read_fail; - - *vbatt = VOLTAGE_FROM_ADC(raw_val); -vbatt_read_fail: - return ret; -} - -static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur) -{ - int ret, discharge; - - /* First check discharge current, so that we do only 1 read on bat. */ - ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge); - if (ret < 0) - return ret; - - if (discharge > 0) { - *cur = -1 * discharge; - return 0; - } - - return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur); -} - -static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv) -{ - int ret; - - ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG); - if (ret >= 0) - *vocv = VOLTAGE_FROM_ADC(ret); - - return ret; -} - static int fuel_gauge_battery_health(struct axp288_fg_info *info) { - int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN; - - ret = fuel_gauge_get_vocv(info, &vocv); - if (ret < 0) - goto health_read_fail; + int vocv = VOLTAGE_FROM_ADC(info->ocv); + int health = POWER_SUPPLY_HEALTH_UNKNOWN; if (vocv > info->max_volt) health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; else health = POWER_SUPPLY_HEALTH_GOOD; -health_read_fail: return health; } @@ -308,9 +326,14 @@ static int fuel_gauge_get_property(struct power_supply *ps, union power_supply_propval *val) { struct axp288_fg_info *info = power_supply_get_drvdata(ps); - int ret = 0, value; + int ret, value; mutex_lock(&info->lock); + + ret = fuel_gauge_update_registers(info); + if (ret < 0) + goto out; + switch (prop) { case POWER_SUPPLY_PROP_STATUS: fuel_gauge_get_status(info); @@ -320,21 +343,19 @@ static int fuel_gauge_get_property(struct power_supply *ps, val->intval = fuel_gauge_battery_health(info); break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: - ret = fuel_gauge_get_vbatt(info, &value); - if (ret < 0) - goto fuel_gauge_read_err; + value = VOLTAGE_FROM_ADC(info->bat_volt); val->intval = PROP_VOLT(value); break; case POWER_SUPPLY_PROP_VOLTAGE_OCV: - ret = fuel_gauge_get_vocv(info, &value); - if (ret < 0) - goto fuel_gauge_read_err; + value = VOLTAGE_FROM_ADC(info->ocv); val->intval = PROP_VOLT(value); break; case POWER_SUPPLY_PROP_CURRENT_NOW: - ret = fuel_gauge_get_current(info, &value); - if (ret < 0) - goto fuel_gauge_read_err; + if (info->d_curr > 0) + value = -1 * info->d_curr; + else + value = info->c_curr; + val->intval = PROP_CURR(value); break; case POWER_SUPPLY_PROP_PRESENT: @@ -344,13 +365,9 @@ static int fuel_gauge_get_property(struct power_supply *ps, val->intval = 0; break; case POWER_SUPPLY_PROP_CAPACITY: - ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES); - if (ret < 0) - goto fuel_gauge_read_err; - - if (!(ret & FG_REP_CAP_VALID)) + if (!(info->fg_res & FG_REP_CAP_VALID)) dev_err(info->dev, "capacity measurement not valid\n"); - val->intval = (ret & FG_REP_CAP_VAL_MASK); + val->intval = (info->fg_res & FG_REP_CAP_VAL_MASK); break; case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: val->intval = (info->low_cap & 0x0f); @@ -359,31 +376,19 @@ static int fuel_gauge_get_property(struct power_supply *ps, val->intval = POWER_SUPPLY_TECHNOLOGY_LION; break; case POWER_SUPPLY_PROP_CHARGE_NOW: - ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG); - if (ret < 0) - goto fuel_gauge_read_err; - - val->intval = ret * FG_DES_CAP_RES_LSB; + val->intval = info->fg_cc_mtr1 * FG_DES_CAP_RES_LSB; break; case POWER_SUPPLY_PROP_CHARGE_FULL: - ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG); - if (ret < 0) - goto fuel_gauge_read_err; - - val->intval = ret * FG_DES_CAP_RES_LSB; + val->intval = info->fg_des_cap1 * FG_DES_CAP_RES_LSB; break; case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: val->intval = PROP_VOLT(info->max_volt); break; default: - mutex_unlock(&info->lock); - return -EINVAL; + ret = -EINVAL; } - mutex_unlock(&info->lock); - return 0; - -fuel_gauge_read_err: +out: mutex_unlock(&info->lock); return ret; } @@ -472,6 +477,8 @@ static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev) dev_warn(info->dev, "Spurious Interrupt!!!\n"); } + info->valid = 0; /* Force updating of the cached registers */ + power_supply_changed(info->bat); return IRQ_HANDLED; } @@ -480,6 +487,7 @@ static void fuel_gauge_external_power_changed(struct power_supply *psy) { struct axp288_fg_info *info = power_supply_get_drvdata(psy); + info->valid = 0; /* Force updating of the cached registers */ power_supply_changed(info->bat); } @@ -637,6 +645,7 @@ static int axp288_fuel_gauge_probe(struct platform_device *pdev) info->regmap = axp20x->regmap; info->regmap_irqc = axp20x->regmap_irqc; info->status = POWER_SUPPLY_STATUS_UNKNOWN; + info->valid = 0; platform_set_drvdata(pdev, info);