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Subject[PATCH 2/4] power: supply: sc27xx: Add one property to read charge voltage
Date
Add POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE property to get charge
voltage sampling by ADC controller, which is used to validate if the
charge voltage is in normal range or not in charger manager.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
drivers/power/supply/sc27xx_fuel_gauge.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)

diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c
index 76da189..4926b8a 100644
--- a/drivers/power/supply/sc27xx_fuel_gauge.c
+++ b/drivers/power/supply/sc27xx_fuel_gauge.c
@@ -72,6 +72,7 @@
* @lock: protect the structure
* @gpiod: GPIO for battery detection
* @channel: IIO channel to get battery temperature
+ * @charge_chan: IIO channel to get charge voltage
* @internal_resist: the battery internal resistance in mOhm
* @total_cap: the total capacity of the battery in mAh
* @init_cap: the initial capacity of the battery in mAh
@@ -92,6 +93,7 @@ struct sc27xx_fgu_data {
struct mutex lock;
struct gpio_desc *gpiod;
struct iio_channel *channel;
+ struct iio_channel *charge_chan;
bool bat_present;
int internal_resist;
int total_cap;
@@ -391,6 +393,18 @@ static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val)
return 0;
}

+static int sc27xx_fgu_get_charge_vol(struct sc27xx_fgu_data *data, int *val)
+{
+ int ret, vol;
+
+ ret = iio_read_channel_processed(data->charge_chan, &vol);
+ if (ret < 0)
+ return ret;
+
+ *val = vol * 1000;
+ return 0;
+}
+
static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp)
{
return iio_read_channel_processed(data->channel, temp);
@@ -502,6 +516,14 @@ static int sc27xx_fgu_get_property(struct power_supply *psy,
val->intval = value;
break;

+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ ret = sc27xx_fgu_get_charge_vol(data, &value);
+ if (ret)
+ goto error;
+
+ val->intval = value;
+ break;
+
case POWER_SUPPLY_PROP_CURRENT_NOW:
case POWER_SUPPLY_PROP_CURRENT_AVG:
ret = sc27xx_fgu_get_current(data, &value);
@@ -567,6 +589,7 @@ static int sc27xx_fgu_property_is_writeable(struct power_supply *psy,
POWER_SUPPLY_PROP_VOLTAGE_OCV,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
};

static const struct power_supply_desc sc27xx_fgu_desc = {
@@ -907,6 +930,12 @@ static int sc27xx_fgu_probe(struct platform_device *pdev)
return PTR_ERR(data->channel);
}

+ data->charge_chan = devm_iio_channel_get(&pdev->dev, "charge-vol");
+ if (IS_ERR(data->charge_chan)) {
+ dev_err(&pdev->dev, "failed to get charge IIO channel\n");
+ return PTR_ERR(data->charge_chan);
+ }
+
data->gpiod = devm_gpiod_get(&pdev->dev, "bat-detect", GPIOD_IN);
if (IS_ERR(data->gpiod)) {
dev_err(&pdev->dev, "failed to get battery detection GPIO\n");
--
1.7.9.5
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