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lp8788-charger: Fix wrong ADC conversion

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To get the battery voltage and temperature, IIO ADC functions are used.
LP8788 ADC driver provides RAW and SCALE channel information. This patch
fixes wrong ADC result.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Reviewed-by Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
This commit is contained in:
Kim, Milo 2012-10-19 00:12:21 +00:00 committed by Anton Vorontsov
parent 968a47836c
commit 340968de48
1 changed files with 7 additions and 19 deletions
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26
drivers/power/lp8788-charger.c
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@ -235,25 +235,14 @@ static int lp8788_get_battery_present(struct lp8788_charger *pchg,
return 0;
}
static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg,
unsigned int *result)
static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result)
{
struct iio_channel *channel = pchg->chan[LP8788_VBATT];
int scaleint;
int scalepart;
int ret;
if (!channel)
return -EINVAL;
ret = iio_read_channel_scale(channel, &scaleint, &scalepart);
if (ret != IIO_VAL_INT_PLUS_MICRO)
return -EINVAL;
/* unit: mV */
*result = (scaleint + scalepart * 1000000) / 1000;
return 0;
return iio_read_channel_processed(channel, result);
}
static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
@ -268,7 +257,7 @@ static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
struct lp8788 *lp = pchg->lp;
struct lp8788_charger_platform_data *pdata = pchg->pdata;
unsigned int max_vbatt;
unsigned int vbatt;
int vbatt;
enum lp8788_charging_state state;
u8 data;
int ret;
@ -304,19 +293,18 @@ static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
union power_supply_propval *val)
{
struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
int scaleint;
int scalepart;
int result;
int ret;
if (!channel)
return -EINVAL;
ret = iio_read_channel_scale(channel, &scaleint, &scalepart);
if (ret != IIO_VAL_INT_PLUS_MICRO)
ret = iio_read_channel_processed(channel, &result);
if (ret < 0)
return -EINVAL;
/* unit: 0.1 'C */
val->intval = (scaleint + scalepart * 1000000) / 100;
val->intval = result * 10;
return 0;
}