diff options
Diffstat (limited to 'drivers/power/max17042_battery.c')
| -rw-r--r-- | drivers/power/max17042_battery.c | 199 |
1 files changed, 188 insertions, 11 deletions
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c index 6cc5e87ec031..e89255764745 100644 --- a/drivers/power/max17042_battery.c +++ b/drivers/power/max17042_battery.c @@ -63,6 +63,8 @@ #define dP_ACC_100 0x1900 #define dP_ACC_200 0x3200 +#define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */ + struct max17042_chip { struct i2c_client *client; struct regmap *regmap; @@ -85,10 +87,94 @@ static enum power_supply_property max17042_battery_props[] = { POWER_SUPPLY_PROP_CHARGE_FULL, POWER_SUPPLY_PROP_CHARGE_COUNTER, POWER_SUPPLY_PROP_TEMP, + POWER_SUPPLY_PROP_TEMP_ALERT_MIN, + POWER_SUPPLY_PROP_TEMP_ALERT_MAX, + POWER_SUPPLY_PROP_TEMP_MIN, + POWER_SUPPLY_PROP_TEMP_MAX, + POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_CURRENT_NOW, POWER_SUPPLY_PROP_CURRENT_AVG, }; +static int max17042_get_temperature(struct max17042_chip *chip, int *temp) +{ + int ret; + u32 data; + struct regmap *map = chip->regmap; + + ret = regmap_read(map, MAX17042_TEMP, &data); + if (ret < 0) + return ret; + + *temp = data; + /* The value is signed. */ + if (*temp & 0x8000) { + *temp = (0x7fff & ~*temp) + 1; + *temp *= -1; + } + + /* The value is converted into deci-centigrade scale */ + /* Units of LSB = 1 / 256 degree Celsius */ + *temp = *temp * 10 / 256; + return 0; +} + +static int max17042_get_battery_health(struct max17042_chip *chip, int *health) +{ + int temp, vavg, vbatt, ret; + u32 val; + + ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val); + if (ret < 0) + goto health_error; + + /* bits [0-3] unused */ + vavg = val * 625 / 8; + /* Convert to millivolts */ + vavg /= 1000; + + ret = regmap_read(chip->regmap, MAX17042_VCELL, &val); + if (ret < 0) + goto health_error; + + /* bits [0-3] unused */ + vbatt = val * 625 / 8; + /* Convert to millivolts */ + vbatt /= 1000; + + if (vavg < chip->pdata->vmin) { + *health = POWER_SUPPLY_HEALTH_DEAD; + goto out; + } + + if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) { + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + goto out; + } + + ret = max17042_get_temperature(chip, &temp); + if (ret < 0) + goto health_error; + + if (temp <= chip->pdata->temp_min) { + *health = POWER_SUPPLY_HEALTH_COLD; + goto out; + } + + if (temp >= chip->pdata->temp_max) { + *health = POWER_SUPPLY_HEALTH_OVERHEAT; + goto out; + } + + *health = POWER_SUPPLY_HEALTH_GOOD; + +out: + return 0; + +health_error: + return ret; +} + static int max17042_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) @@ -181,19 +267,34 @@ static int max17042_get_property(struct power_supply *psy, val->intval = data * 1000 / 2; break; case POWER_SUPPLY_PROP_TEMP: - ret = regmap_read(map, MAX17042_TEMP, &data); + ret = max17042_get_temperature(chip, &val->intval); + if (ret < 0) + return ret; + break; + case POWER_SUPPLY_PROP_TEMP_ALERT_MIN: + ret = regmap_read(map, MAX17042_TALRT_Th, &data); + if (ret < 0) + return ret; + /* LSB is Alert Minimum. In deci-centigrade */ + val->intval = (data & 0xff) * 10; + break; + case POWER_SUPPLY_PROP_TEMP_ALERT_MAX: + ret = regmap_read(map, MAX17042_TALRT_Th, &data); + if (ret < 0) + return ret; + /* MSB is Alert Maximum. In deci-centigrade */ + val->intval = (data >> 8) * 10; + break; + case POWER_SUPPLY_PROP_TEMP_MIN: + val->intval = chip->pdata->temp_min; + break; + case POWER_SUPPLY_PROP_TEMP_MAX: + val->intval = chip->pdata->temp_max; + break; + case POWER_SUPPLY_PROP_HEALTH: + ret = max17042_get_battery_health(chip, &val->intval); if (ret < 0) return ret; - - val->intval = data; - /* The value is signed. */ - if (val->intval & 0x8000) { - val->intval = (0x7fff & ~val->intval) + 1; - val->intval *= -1; - } - /* The value is converted into deci-centigrade scale */ - /* Units of LSB = 1 / 256 degree Celsius */ - val->intval = val->intval * 10 / 256; break; case POWER_SUPPLY_PROP_CURRENT_NOW: if (chip->pdata->enable_current_sense) { @@ -237,6 +338,69 @@ static int max17042_get_property(struct power_supply *psy, return 0; } +static int max17042_set_property(struct power_supply *psy, + enum power_supply_property psp, + const union power_supply_propval *val) +{ + struct max17042_chip *chip = power_supply_get_drvdata(psy); + struct regmap *map = chip->regmap; + int ret = 0; + u32 data; + int8_t temp; + + switch (psp) { + case POWER_SUPPLY_PROP_TEMP_ALERT_MIN: + ret = regmap_read(map, MAX17042_TALRT_Th, &data); + if (ret < 0) + return ret; + + /* Input in deci-centigrade, convert to centigrade */ + temp = val->intval / 10; + /* force min < max */ + if (temp >= (int8_t)(data >> 8)) + temp = (int8_t)(data >> 8) - 1; + /* Write both MAX and MIN ALERT */ + data = (data & 0xff00) + temp; + ret = regmap_write(map, MAX17042_TALRT_Th, data); + break; + case POWER_SUPPLY_PROP_TEMP_ALERT_MAX: + ret = regmap_read(map, MAX17042_TALRT_Th, &data); + if (ret < 0) + return ret; + + /* Input in Deci-Centigrade, convert to centigrade */ + temp = val->intval / 10; + /* force max > min */ + if (temp <= (int8_t)(data & 0xff)) + temp = (int8_t)(data & 0xff) + 1; + /* Write both MAX and MIN ALERT */ + data = (data & 0xff) + (temp << 8); + ret = regmap_write(map, MAX17042_TALRT_Th, data); + break; + default: + ret = -EINVAL; + } + + return ret; +} + +static int max17042_property_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + int ret; + + switch (psp) { + case POWER_SUPPLY_PROP_TEMP_ALERT_MIN: + case POWER_SUPPLY_PROP_TEMP_ALERT_MAX: + ret = 1; + break; + default: + ret = 0; + } + + return ret; +} + static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value) { int retries = 8; @@ -645,6 +809,15 @@ max17042_get_pdata(struct device *dev) pdata->enable_current_sense = true; } + if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min)) + pdata->temp_min = INT_MIN; + if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max)) + pdata->temp_max = INT_MAX; + if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin)) + pdata->vmin = INT_MIN; + if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax)) + pdata->vmax = INT_MAX; + return pdata; } #else @@ -665,6 +838,8 @@ static const struct power_supply_desc max17042_psy_desc = { .name = "max170xx_battery", .type = POWER_SUPPLY_TYPE_BATTERY, .get_property = max17042_get_property, + .set_property = max17042_set_property, + .property_is_writeable = max17042_property_is_writeable, .properties = max17042_battery_props, .num_properties = ARRAY_SIZE(max17042_battery_props), }; @@ -673,6 +848,8 @@ static const struct power_supply_desc max17042_no_current_sense_psy_desc = { .name = "max170xx_battery", .type = POWER_SUPPLY_TYPE_BATTERY, .get_property = max17042_get_property, + .set_property = max17042_set_property, + .property_is_writeable = max17042_property_is_writeable, .properties = max17042_battery_props, .num_properties = ARRAY_SIZE(max17042_battery_props) - 2, }; |