[PATCH] iio: adc: mt6370: Fix ibus and ibat scaling value of some specific vendor ID chips

ChiaEn Wu
2023-03-24T14:14:49Z

The scale value of ibus and ibat on the datasheet is incorrect due to the
customer report after the experimentation with some specific vendor ID
chips.

Signed-off-by: ChiaEn Wu <chiaen_wu@richtek.com>
---
drivers/iio/adc/mt6370-adc.c | 48 ++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 46 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/mt6370-adc.c b/drivers/iio/adc/mt6370-adc.c
index bc62e5a..eea7223 100644
--- a/drivers/iio/adc/mt6370-adc.c
+++ b/drivers/iio/adc/mt6370-adc.c
@@ -19,6 +19,7 @@

#include <dt-bindings/iio/adc/mediatek,mt6370_adc.h>

+#define MT6370_REG_DEV_INFO 0x100
#define MT6370_REG_CHG_CTRL3 0x113
#define MT6370_REG_CHG_CTRL7 0x117
#define MT6370_REG_CHG_ADC 0x121
@@ -27,6 +28,7 @@
#define MT6370_ADC_START_MASK BIT(0)
#define MT6370_ADC_IN_SEL_MASK GENMASK(7, 4)
#define MT6370_AICR_ICHG_MASK GENMASK(7, 2)
+#define MT6370_VENID_MASK GENMASK(7, 4)

#define MT6370_AICR_100_mA 0x0
#define MT6370_AICR_150_mA 0x1
@@ -47,6 +49,10 @@
#define ADC_CONV_TIME_MS 35
#define ADC_CONV_POLLING_TIME_US 1000

+#define MT6370_VID_RT5081 0x8
+#define MT6370_VID_RT5081A 0xA
+#define MT6370_VID_MT6370 0xE
+
struct mt6370_adc_data {
struct device *dev;
struct regmap *regmap;
@@ -55,6 +61,7 @@ struct mt6370_adc_data {
* from being read at the same time.
*/
struct mutex adc_lock;
+ int vid;
};

static int mt6370_adc_read_channel(struct mt6370_adc_data *priv, int chan,
@@ -98,6 +105,26 @@ static int mt6370_adc_read_channel(struct mt6370_adc_data *priv, int chan,
return ret;
}

+static int mt6370_adc_get_ibus_scale(struct mt6370_adc_data *priv)
+{
+ if (priv->vid == MT6370_VID_RT5081 ||
+ priv->vid == MT6370_VID_RT5081A ||
+ priv->vid == MT6370_VID_MT6370)
+ return 3350;
+ else
+ return 3875;
+}
+
+static int mt6370_adc_get_ibat_scale(struct mt6370_adc_data *priv)
+{
+ if (priv->vid == MT6370_VID_RT5081 ||
+ priv->vid == MT6370_VID_RT5081A ||
+ priv->vid == MT6370_VID_MT6370)
+ return 2680;
+ else
+ return 3870;
+}
+
static int mt6370_adc_read_scale(struct mt6370_adc_data *priv,
int chan, int *val1, int *val2)
{
@@ -123,7 +150,7 @@ static int mt6370_adc_read_scale(struct mt6370_adc_data *priv,
case MT6370_AICR_250_mA:
case MT6370_AICR_300_mA:
case MT6370_AICR_350_mA:
- *val1 = 3350;
+ *val1 = mt6370_adc_get_ibus_scale(priv);
break;
default:
*val1 = 5000;
@@ -150,7 +177,7 @@ static int mt6370_adc_read_scale(struct mt6370_adc_data *priv,
case MT6370_ICHG_600_mA:
case MT6370_ICHG_700_mA:
case MT6370_ICHG_800_mA:
- *val1 = 2680;
+ *val1 = mt6370_adc_get_ibat_scale(priv);
break;
default:
*val1 = 5000;
@@ -251,6 +278,19 @@ static const struct iio_chan_spec mt6370_adc_channels[] = {
MT6370_ADC_CHAN(TEMP_JC, IIO_TEMP, 12, BIT(IIO_CHAN_INFO_OFFSET)),
};

+static int mt6370_get_vendor_info(struct mt6370_adc_data *priv)
+{
+ unsigned int dev_info;
+ int ret;
+
+ ret = regmap_read(priv->regmap, MT6370_REG_DEV_INFO, &dev_info);
+ if (ret)
+ return ret;
+
+ priv->vid = FIELD_GET(MT6370_VENID_MASK, dev_info);
+ return 0;
+}
+
static int mt6370_adc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -263,6 +303,10 @@ static int mt6370_adc_probe(struct platform_device *pdev)
if (!regmap)
return dev_err_probe(dev, -ENODEV, "Failed to get regmap\n");

+ ret = mt6370_get_vendor_info(priv);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to get vid\n");
+
indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
if (!indio_dev)
return -ENOMEM;
--
2.7.4