power: max17042_battery: add HEALTH and TEMP_* properties support
This patch adds the support for following battery properties to max17042 fuel gauge driver. 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 Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Ramakrishna Pallala
Sebastian Reichel
parent
4aeae9cb0d
commit
edd4ab0559
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@ -63,6 +63,8 @@
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#define dP_ACC_100 0x1900
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#define dP_ACC_200 0x3200
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#define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */
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struct max17042_chip {
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struct i2c_client *client;
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struct regmap *regmap;
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@ -85,10 +87,94 @@ static enum power_supply_property max17042_battery_props[] = {
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_COUNTER,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
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POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
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POWER_SUPPLY_PROP_TEMP_MIN,
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POWER_SUPPLY_PROP_TEMP_MAX,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CURRENT_AVG,
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};
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static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
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{
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int ret;
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u32 data;
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struct regmap *map = chip->regmap;
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ret = regmap_read(map, MAX17042_TEMP, &data);
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if (ret < 0)
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return ret;
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*temp = data;
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/* The value is signed. */
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if (*temp & 0x8000) {
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*temp = (0x7fff & ~*temp) + 1;
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*temp *= -1;
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}
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/* The value is converted into deci-centigrade scale */
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/* Units of LSB = 1 / 256 degree Celsius */
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*temp = *temp * 10 / 256;
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return 0;
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}
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static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
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{
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int temp, vavg, vbatt, ret;
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u32 val;
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ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
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if (ret < 0)
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goto health_error;
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/* bits [0-3] unused */
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vavg = val * 625 / 8;
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/* Convert to millivolts */
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vavg /= 1000;
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ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
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if (ret < 0)
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goto health_error;
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/* bits [0-3] unused */
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vbatt = val * 625 / 8;
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/* Convert to millivolts */
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vbatt /= 1000;
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if (vavg < chip->pdata->vmin) {
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*health = POWER_SUPPLY_HEALTH_DEAD;
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goto out;
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}
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if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
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*health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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goto out;
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}
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ret = max17042_get_temperature(chip, &temp);
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if (ret < 0)
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goto health_error;
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if (temp <= chip->pdata->temp_min) {
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*health = POWER_SUPPLY_HEALTH_COLD;
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goto out;
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}
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if (temp >= chip->pdata->temp_max) {
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*health = POWER_SUPPLY_HEALTH_OVERHEAT;
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goto out;
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}
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*health = POWER_SUPPLY_HEALTH_GOOD;
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out:
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return 0;
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health_error:
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return ret;
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}
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static int max17042_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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@ -181,19 +267,34 @@ static int max17042_get_property(struct power_supply *psy,
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val->intval = data * 1000 / 2;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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ret = regmap_read(map, MAX17042_TEMP, &data);
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ret = max17042_get_temperature(chip, &val->intval);
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if (ret < 0)
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return ret;
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break;
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case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
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ret = regmap_read(map, MAX17042_TALRT_Th, &data);
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if (ret < 0)
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return ret;
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/* LSB is Alert Minimum. In deci-centigrade */
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val->intval = (data & 0xff) * 10;
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break;
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case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
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ret = regmap_read(map, MAX17042_TALRT_Th, &data);
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if (ret < 0)
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return ret;
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/* MSB is Alert Maximum. In deci-centigrade */
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val->intval = (data >> 8) * 10;
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break;
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case POWER_SUPPLY_PROP_TEMP_MIN:
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val->intval = chip->pdata->temp_min;
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break;
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case POWER_SUPPLY_PROP_TEMP_MAX:
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val->intval = chip->pdata->temp_max;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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ret = max17042_get_battery_health(chip, &val->intval);
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if (ret < 0)
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return ret;
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val->intval = data;
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/* The value is signed. */
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if (val->intval & 0x8000) {
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val->intval = (0x7fff & ~val->intval) + 1;
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val->intval *= -1;
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}
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/* The value is converted into deci-centigrade scale */
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/* Units of LSB = 1 / 256 degree Celsius */
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val->intval = val->intval * 10 / 256;
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break;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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if (chip->pdata->enable_current_sense) {
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@ -237,6 +338,69 @@ static int max17042_get_property(struct power_supply *psy,
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return 0;
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}
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static int max17042_set_property(struct power_supply *psy,
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enum power_supply_property psp,
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const union power_supply_propval *val)
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{
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struct max17042_chip *chip = power_supply_get_drvdata(psy);
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struct regmap *map = chip->regmap;
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int ret = 0;
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u32 data;
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int8_t temp;
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switch (psp) {
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case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
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ret = regmap_read(map, MAX17042_TALRT_Th, &data);
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if (ret < 0)
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return ret;
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/* Input in deci-centigrade, convert to centigrade */
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temp = val->intval / 10;
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/* force min < max */
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if (temp >= (int8_t)(data >> 8))
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temp = (int8_t)(data >> 8) - 1;
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/* Write both MAX and MIN ALERT */
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data = (data & 0xff00) + temp;
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ret = regmap_write(map, MAX17042_TALRT_Th, data);
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break;
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case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
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ret = regmap_read(map, MAX17042_TALRT_Th, &data);
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if (ret < 0)
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return ret;
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/* Input in Deci-Centigrade, convert to centigrade */
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temp = val->intval / 10;
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/* force max > min */
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if (temp <= (int8_t)(data & 0xff))
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temp = (int8_t)(data & 0xff) + 1;
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/* Write both MAX and MIN ALERT */
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data = (data & 0xff) + (temp << 8);
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ret = regmap_write(map, MAX17042_TALRT_Th, data);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static int max17042_property_is_writeable(struct power_supply *psy,
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enum power_supply_property psp)
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{
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int ret;
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switch (psp) {
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case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
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case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
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ret = 1;
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break;
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default:
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ret = 0;
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}
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return ret;
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}
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static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
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{
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int retries = 8;
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@ -665,6 +829,8 @@ static const struct power_supply_desc max17042_psy_desc = {
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.name = "max170xx_battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.get_property = max17042_get_property,
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.set_property = max17042_set_property,
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.property_is_writeable = max17042_property_is_writeable,
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.properties = max17042_battery_props,
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.num_properties = ARRAY_SIZE(max17042_battery_props),
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};
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@ -673,6 +839,8 @@ static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
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.name = "max170xx_battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.get_property = max17042_get_property,
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.set_property = max17042_set_property,
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.property_is_writeable = max17042_property_is_writeable,
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.properties = max17042_battery_props,
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.num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
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};
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@ -215,6 +215,10 @@ struct max17042_platform_data {
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* the datasheet although it can be changed by board designers.
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*/
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unsigned int r_sns;
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int vmin; /* in millivolts */
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int vmax; /* in millivolts */
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int temp_min; /* in tenths of degree Celsius */
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int temp_max; /* in tenths of degree Celsius */
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};
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#endif /* __MAX17042_BATTERY_H_ */
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