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bq27x00_battery: Cache temperature value in converted unit

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Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Pali Rohár 2011-11-01 01:43:07 +01:00 committed by Anton Vorontsov
parent a8f6bd23cc
commit d149e98e02
1 changed files with 24 additions and 21 deletions
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45
drivers/power/bq27x00_battery.c
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@ -247,6 +247,28 @@ static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
return ae;
}
/*
* Return the battery temperature in tenths of degree Celsius
* Or < 0 if something fails.
*/
static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
{
int temp;
temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
if (temp < 0) {
dev_err(di->dev, "error reading temperature\n");
return temp;
}
if (di->chip == BQ27500)
temp -= 2731;
else
temp = ((temp * 5) - 5463) / 2;
return temp;
}
/*
* Return the battery Cycle count total
* Or < 0 if something fails.
@ -304,7 +326,7 @@ static void bq27x00_update(struct bq27x00_device_info *di)
cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
cache.charge_full = bq27x00_battery_read_lmd(di);
}
cache.temperature = bq27x00_read(di, BQ27x00_REG_TEMP, false);
cache.temperature = bq27x00_battery_read_temperature(di);
cache.cycle_count = bq27x00_battery_read_cyct(di);
/* We only have to read charge design full once */
@ -334,25 +356,6 @@ static void bq27x00_battery_poll(struct work_struct *work)
}
}
/*
* Return the battery temperature in tenths of degree Celsius
* Or < 0 if something fails.
*/
static int bq27x00_battery_temperature(struct bq27x00_device_info *di,
union power_supply_propval *val)
{
if (di->cache.temperature < 0)
return di->cache.temperature;
if (di->chip == BQ27500)
val->intval = di->cache.temperature - 2731;
else
val->intval = ((di->cache.temperature * 5) - 5463) / 2;
return 0;
}
/*
* Return the battery average current in µA
* Note that current can be negative signed as well
@ -511,7 +514,7 @@ static int bq27x00_battery_get_property(struct power_supply *psy,
ret = bq27x00_battery_capacity_level(di, val);
break;
case POWER_SUPPLY_PROP_TEMP:
ret = bq27x00_battery_temperature(di, val);
ret = bq27x00_simple_value(di->cache.temperature, val);
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
ret = bq27x00_simple_value(di->cache.time_to_empty, val);