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power: supply: ltc2941-battery-gauge: Add charge empty and full properties
Add properties for charge empty and charge full thresholds. Signed-off-by: Ladislav Michl <ladis@linux-mips.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
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@ -34,6 +34,10 @@ enum ltc294x_reg {
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LTC294X_REG_CONTROL = 0x01,
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LTC294X_REG_ACC_CHARGE_MSB = 0x02,
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LTC294X_REG_ACC_CHARGE_LSB = 0x03,
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LTC294X_REG_CHARGE_THR_HIGH_MSB = 0x04,
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LTC294X_REG_CHARGE_THR_HIGH_LSB = 0x05,
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LTC294X_REG_CHARGE_THR_LOW_MSB = 0x06,
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LTC294X_REG_CHARGE_THR_LOW_LSB = 0x07,
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LTC294X_REG_VOLTAGE_MSB = 0x08,
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LTC294X_REG_VOLTAGE_LSB = 0x09,
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LTC2942_REG_TEMPERATURE_MSB = 0x0C,
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@ -179,21 +183,22 @@ static int ltc294x_reset(const struct ltc294x_info *info, int prescaler_exp)
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return ret;
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}
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static int ltc294x_read_charge_register(const struct ltc294x_info *info)
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{
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static int ltc294x_read_charge_register(const struct ltc294x_info *info,
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enum ltc294x_reg reg)
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{
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int ret;
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u8 datar[2];
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ret = ltc294x_read_regs(info->client,
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LTC294X_REG_ACC_CHARGE_MSB, &datar[0], 2);
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ret = ltc294x_read_regs(info->client, reg, &datar[0], 2);
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if (ret < 0)
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return ret;
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return (datar[0] << 8) + datar[1];
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}
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static int ltc294x_get_charge_now(const struct ltc294x_info *info, int *val)
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static int ltc294x_get_charge(const struct ltc294x_info *info,
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enum ltc294x_reg reg, int *val)
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{
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int value = ltc294x_read_charge_register(info);
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int value = ltc294x_read_charge_register(info, reg);
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if (value < 0)
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return value;
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@ -245,10 +250,29 @@ static int ltc294x_set_charge_now(const struct ltc294x_info *info, int val)
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return ret < 0 ? ret : 0;
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}
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static int ltc294x_set_charge_thr(const struct ltc294x_info *info,
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enum ltc294x_reg reg, int val)
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{
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u8 dataw[2];
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s32 value;
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value = convert_uAh_to_bin(info, val);
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/* Direction depends on how sense+/- were connected */
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if (info->Qlsb < 0)
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value += 0xFFFF;
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if ((value < 0) || (value > 0xFFFF)) /* input validation */
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return -EINVAL;
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/* Set new charge value */
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dataw[0] = I16_MSB(value);
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dataw[1] = I16_LSB(value);
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return ltc294x_write_regs(info->client, reg, &dataw[0], 2);
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}
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static int ltc294x_get_charge_counter(
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const struct ltc294x_info *info, int *val)
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{
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int value = ltc294x_read_charge_register(info);
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int value = ltc294x_read_charge_register(info, LTC294X_REG_ACC_CHARGE_MSB);
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if (value < 0)
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return value;
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@ -336,8 +360,15 @@ static int ltc294x_get_property(struct power_supply *psy,
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struct ltc294x_info *info = power_supply_get_drvdata(psy);
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switch (prop) {
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case POWER_SUPPLY_PROP_CHARGE_FULL:
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return ltc294x_get_charge(info, LTC294X_REG_CHARGE_THR_HIGH_MSB,
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&val->intval);
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case POWER_SUPPLY_PROP_CHARGE_EMPTY:
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return ltc294x_get_charge(info, LTC294X_REG_CHARGE_THR_LOW_MSB,
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&val->intval);
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case POWER_SUPPLY_PROP_CHARGE_NOW:
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return ltc294x_get_charge_now(info, &val->intval);
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return ltc294x_get_charge(info, LTC294X_REG_ACC_CHARGE_MSB,
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&val->intval);
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case POWER_SUPPLY_PROP_CHARGE_COUNTER:
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return ltc294x_get_charge_counter(info, &val->intval);
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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@ -358,6 +389,12 @@ static int ltc294x_set_property(struct power_supply *psy,
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struct ltc294x_info *info = power_supply_get_drvdata(psy);
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switch (psp) {
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case POWER_SUPPLY_PROP_CHARGE_FULL:
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return ltc294x_set_charge_thr(info,
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LTC294X_REG_CHARGE_THR_HIGH_MSB, val->intval);
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case POWER_SUPPLY_PROP_CHARGE_EMPTY:
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return ltc294x_set_charge_thr(info,
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LTC294X_REG_CHARGE_THR_LOW_MSB, val->intval);
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case POWER_SUPPLY_PROP_CHARGE_NOW:
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return ltc294x_set_charge_now(info, val->intval);
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default:
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@ -369,6 +406,8 @@ static int ltc294x_property_is_writeable(
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struct power_supply *psy, enum power_supply_property psp)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_CHARGE_FULL:
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case POWER_SUPPLY_PROP_CHARGE_EMPTY:
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case POWER_SUPPLY_PROP_CHARGE_NOW:
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return 1;
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default:
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@ -378,7 +417,7 @@ static int ltc294x_property_is_writeable(
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static void ltc294x_update(struct ltc294x_info *info)
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{
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int charge = ltc294x_read_charge_register(info);
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int charge = ltc294x_read_charge_register(info, LTC294X_REG_ACC_CHARGE_MSB);
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if (charge != info->charge) {
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info->charge = charge;
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@ -397,6 +436,8 @@ static void ltc294x_work(struct work_struct *work)
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static enum power_supply_property ltc294x_properties[] = {
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POWER_SUPPLY_PROP_CHARGE_COUNTER,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_EMPTY,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_TEMP,
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