2021-08-12 02:26:25

by Hui Liu

Subject: [PATCH 1/2] iio: mtk-auxadc: add support IIO_CHAN_INFO_RAW case

Add support IIO_CHAN_INFO_RAW case.

Signed-off-by: Hui Liu <[email protected]>
---
drivers/iio/adc/mt6577_auxadc.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
index 79c1dd68b909..e995d43287b2 100644
--- a/drivers/iio/adc/mt6577_auxadc.c
+++ b/drivers/iio/adc/mt6577_auxadc.c
@@ -60,7 +60,8 @@ static const struct mtk_auxadc_compatible mt6765_compat = {
.type = IIO_VOLTAGE, \
.indexed = 1, \
.channel = (idx), \
- .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_PROCESSED), \
}

static const struct iio_chan_spec mt6577_auxadc_iio_channels[] = {
@@ -181,6 +182,19 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);

switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ *val = mt6577_auxadc_read(indio_dev, chan);
+ if (*val < 0) {
+ dev_notice(indio_dev->dev.parent,
+ "failed to sample data on channel[%d]\n",
+ chan->channel);
+ return *val;
+ }
+ if (adc_dev->dev_comp->sample_data_cali)
+ *val = mt_auxadc_get_cali_data(*val, true);
+
+ return IIO_VAL_INT;
+
case IIO_CHAN_INFO_PROCESSED:
*val = mt6577_auxadc_read(indio_dev, chan);
if (*val < 0) {
--
2.18.0

2021-08-12 02:28:43

by Hui Liu

Subject: [PATCH 2/2] iio: mtk-auxadc: update case IIO_CHAN_INFO_PROCESSED

Covert raw data to processed data.

Signed-off-by: Hui Liu <[email protected]>
---
drivers/iio/adc/mt6577_auxadc.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
index e995d43287b2..cda03a653269 100644
--- a/drivers/iio/adc/mt6577_auxadc.c
+++ b/drivers/iio/adc/mt6577_auxadc.c
@@ -83,6 +83,10 @@ static const struct iio_chan_spec mt6577_auxadc_iio_channels[] = {
MT6577_AUXADC_CHANNEL(15),
};

+/* For Voltage calculation */
+#define VOLTAGE_FULL_RANGE 1500 /* VA voltage */
+#define AUXADC_PRECISE 4096 /* 12 bits */
+
static int mt_auxadc_get_cali_data(int rawdata, bool enable_cali)
{
return rawdata;
@@ -205,6 +209,10 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
}
if (adc_dev->dev_comp->sample_data_cali)
*val = mt_auxadc_get_cali_data(*val, true);
+
+ /* Convert adc raw data to voltage: 0 - 1500 mV */
+ *val = *val * VOLTAGE_FULL_RANGE / AUXADC_PRECISE;
+
return IIO_VAL_INT;

default:
--
2.18.0