diff options
Diffstat (limited to 'drivers/power/max17042_battery.c')
| -rw-r--r-- | drivers/power/max17042_battery.c | 94 |
1 files changed, 62 insertions, 32 deletions
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c index 9f0183c73076..86acee2f9889 100644 --- a/drivers/power/max17042_battery.c +++ b/drivers/power/max17042_battery.c @@ -85,55 +85,79 @@ static int max17042_get_property(struct power_supply *psy, { struct max17042_chip *chip = container_of(psy, struct max17042_chip, battery); + int ret; switch (psp) { case POWER_SUPPLY_PROP_PRESENT: - val->intval = max17042_read_reg(chip->client, - MAX17042_STATUS); - if (val->intval & MAX17042_STATUS_BattAbsent) + ret = max17042_read_reg(chip->client, MAX17042_STATUS); + if (ret < 0) + return ret; + + if (ret & MAX17042_STATUS_BattAbsent) val->intval = 0; else val->intval = 1; break; case POWER_SUPPLY_PROP_CYCLE_COUNT: - val->intval = max17042_read_reg(chip->client, - MAX17042_Cycles); + ret = max17042_read_reg(chip->client, MAX17042_Cycles); + if (ret < 0) + return ret; + + val->intval = ret; break; case POWER_SUPPLY_PROP_VOLTAGE_MAX: - val->intval = max17042_read_reg(chip->client, - MAX17042_MinMaxVolt); - val->intval >>= 8; + ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt); + if (ret < 0) + return ret; + + val->intval = ret >> 8; val->intval *= 20000; /* Units of LSB = 20mV */ break; case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: - val->intval = max17042_read_reg(chip->client, - MAX17042_V_empty); - val->intval >>= 7; + ret = max17042_read_reg(chip->client, MAX17042_V_empty); + if (ret < 0) + return ret; + + val->intval = ret >> 7; val->intval *= 10000; /* Units of LSB = 10mV */ break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: - val->intval = max17042_read_reg(chip->client, - MAX17042_VCELL) * 83; /* 1000 / 12 = 83 */ + ret = max17042_read_reg(chip->client, MAX17042_VCELL); + if (ret < 0) + return ret; + + val->intval = ret * 625 / 8; break; case POWER_SUPPLY_PROP_VOLTAGE_AVG: - val->intval = max17042_read_reg(chip->client, - MAX17042_AvgVCELL) * 83; + ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL); + if (ret < 0) + return ret; + + val->intval = ret * 625 / 8; break; case POWER_SUPPLY_PROP_CAPACITY: - val->intval = max17042_read_reg(chip->client, - MAX17042_SOC) / 256; + ret = max17042_read_reg(chip->client, MAX17042_SOC); + if (ret < 0) + return ret; + + val->intval = ret >> 8; break; case POWER_SUPPLY_PROP_CHARGE_FULL: - val->intval = max17042_read_reg(chip->client, - MAX17042_RepSOC); - if ((val->intval / 256) >= MAX17042_BATTERY_FULL) + ret = max17042_read_reg(chip->client, MAX17042_RepSOC); + if (ret < 0) + return ret; + + if ((ret >> 8) >= MAX17042_BATTERY_FULL) val->intval = 1; - else if (val->intval >= 0) + else if (ret >= 0) val->intval = 0; break; case POWER_SUPPLY_PROP_TEMP: - val->intval = max17042_read_reg(chip->client, - MAX17042_TEMP); + ret = max17042_read_reg(chip->client, MAX17042_TEMP); + if (ret < 0) + return ret; + + val->intval = ret; /* The value is signed. */ if (val->intval & 0x8000) { val->intval = (0x7fff & ~val->intval) + 1; @@ -145,24 +169,30 @@ static int max17042_get_property(struct power_supply *psy, break; case POWER_SUPPLY_PROP_CURRENT_NOW: if (chip->pdata->enable_current_sense) { - val->intval = max17042_read_reg(chip->client, - MAX17042_Current); + ret = max17042_read_reg(chip->client, MAX17042_Current); + if (ret < 0) + return ret; + + val->intval = ret; if (val->intval & 0x8000) { /* Negative */ val->intval = ~val->intval & 0x7fff; val->intval++; val->intval *= -1; } - val->intval >>= 4; - val->intval *= 1000000 * 25 / chip->pdata->r_sns; + val->intval *= 1562500 / chip->pdata->r_sns; } else { return -EINVAL; } break; case POWER_SUPPLY_PROP_CURRENT_AVG: if (chip->pdata->enable_current_sense) { - val->intval = max17042_read_reg(chip->client, - MAX17042_AvgCurrent); + ret = max17042_read_reg(chip->client, + MAX17042_AvgCurrent); + if (ret < 0) + return ret; + + val->intval = ret; if (val->intval & 0x8000) { /* Negative */ val->intval = ~val->intval & 0x7fff; @@ -210,6 +240,9 @@ static int __devinit max17042_probe(struct i2c_client *client, if (!chip->pdata->enable_current_sense) chip->battery.num_properties -= 2; + if (chip->pdata->r_sns == 0) + chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR; + ret = power_supply_register(&client->dev, &chip->battery); if (ret) { dev_err(&client->dev, "failed: power supply register\n"); @@ -226,9 +259,6 @@ static int __devinit max17042_probe(struct i2c_client *client, max17042_write_reg(client, MAX17042_CGAIN, 0x0000); max17042_write_reg(client, MAX17042_MiscCFG, 0x0003); max17042_write_reg(client, MAX17042_LearnCFG, 0x0007); - } else { - if (chip->pdata->r_sns == 0) - chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR; } return 0; |