From: Hui Liu <hui.liu@mediatek.com>
To: <robh+dt@kernel.org>, <jic23@kernel.org>, <lars@metafoo.de>,
<pmeerw@pmeerw.net>
Cc: <srv_heupstream@mediatek.com>, <hui.liu@mediatek.com>,
<zhiyong.tao@mediatek.com>, <chun-hung.wu@mediatek.com>,
<yingjoe.chen@mediatek.com>, <seiya.wang@mediatek.com>,
<matthias.bgg@gmail.com>, <s.hauer@pengutronix.de>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-iio@vger.kernel.org>, <linux-mediatek@lists.infradead.org>
Subject: [PATCH 2/2] iio: mtk-auxadc: update case IIO_CHAN_INFO_PROCESSED
Date: Thu, 12 Aug 2021 10:23:42 +0800 [thread overview]
Message-ID: <20210812022342.29092-2-hui.liu@mediatek.com> (raw)
In-Reply-To: <20210812022342.29092-1-hui.liu@mediatek.com>
Covert raw data to processed data.
Signed-off-by: Hui Liu <hui.liu@mediatek.com>
---
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
prev parent reply other threads:[~2021-08-12 2:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-12 2:23 [PATCH 1/2] iio: mtk-auxadc: add support IIO_CHAN_INFO_RAW case Hui Liu
2021-08-12 2:23 ` Hui Liu [this message]
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