diff options
Diffstat (limited to 'drivers/power/s3c_adc_battery.c')
| -rw-r--r-- | drivers/power/s3c_adc_battery.c | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/drivers/power/s3c_adc_battery.c b/drivers/power/s3c_adc_battery.c index e687ee7f18f..8b804a56675 100644 --- a/drivers/power/s3c_adc_battery.c +++ b/drivers/power/s3c_adc_battery.c @@ -47,6 +47,22 @@ static void s3c_adc_bat_ext_power_changed(struct power_supply *psy) msecs_to_jiffies(JITTER_DELAY)); } +static int gather_samples(struct s3c_adc_client *client, int num, int channel) +{ + int value, i; + + /* default to 1 if nothing is set */ + if (num < 1) + num = 1; + + value = 0; + for (i = 0; i < num; i++) + value += s3c_adc_read(client, channel); + value /= num; + + return value; +} + static enum power_supply_property s3c_adc_backup_bat_props[] = { POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_VOLTAGE_MIN, @@ -67,7 +83,8 @@ static int s3c_adc_backup_bat_get_property(struct power_supply *psy, if (bat->volt_value < 0 || jiffies_to_msecs(jiffies - bat->timestamp) > BAT_POLL_INTERVAL) { - bat->volt_value = s3c_adc_read(bat->client, + bat->volt_value = gather_samples(bat->client, + bat->pdata->backup_volt_samples, bat->pdata->backup_volt_channel); bat->volt_value *= bat->pdata->backup_volt_mult; bat->timestamp = jiffies; @@ -139,9 +156,11 @@ static int s3c_adc_bat_get_property(struct power_supply *psy, if (bat->volt_value < 0 || bat->cur_value < 0 || jiffies_to_msecs(jiffies - bat->timestamp) > BAT_POLL_INTERVAL) { - bat->volt_value = s3c_adc_read(bat->client, + bat->volt_value = gather_samples(bat->client, + bat->pdata->volt_samples, bat->pdata->volt_channel) * bat->pdata->volt_mult; - bat->cur_value = s3c_adc_read(bat->client, + bat->cur_value = gather_samples(bat->client, + bat->pdata->current_samples, bat->pdata->current_channel) * bat->pdata->current_mult; bat->timestamp = jiffies; } |