linux-kernel - [PATCH 10/11] Staging: iio: accel: Add comments about units in data read function

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Date:   Mon,  5 Mar 2018 13:19:29 +0530
From:   Himanshu Jha <himanshujha199640@...il.com>
To:     jic23@...nel.org
Cc:     lars@...afoo.de, Michael.Hennerich@...log.com, knaack.h@....de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, daniel.baluta@...il.com,
        Himanshu Jha <himanshujha199640@...il.com>
Subject: [PATCH 10/11] Staging: iio: accel: Add comments about units in data read function

Clarify the conversion and formation of resultant data in the
adis16201_read_raw() with sufficient comments.

Signed-off-by: Himanshu Jha <himanshujha199640@...il.com>
---
 drivers/staging/iio/accel/adis16201.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/staging/iio/accel/adis16201.c b/drivers/staging/iio/accel/adis16201.c
index 8d795e2..946c7b1 100644
--- a/drivers/staging/iio/accel/adis16201.c
+++ b/drivers/staging/iio/accel/adis16201.c
@@ -130,6 +130,11 @@ static int adis16201_read_raw(struct iio_dev *indio_dev,
 			*val2 = 0;
 			return IIO_VAL_INT_PLUS_MICRO;
 		case IIO_ACCEL:
+		       /*
+			* IIO base unit for sensitivity of accelerometer
+			* is milli g.
+			* 1 LSB represents 0.244 mg.
+			*/
 			*val = 0;
 			*val2 = IIO_G_TO_M_S_2(462400);
 			return IIO_VAL_INT_PLUS_NANO;
@@ -142,6 +147,11 @@ static int adis16201_read_raw(struct iio_dev *indio_dev,
 		}
 		break;
 	case IIO_CHAN_INFO_OFFSET:
+	       /*
+		* The raw ADC value is 0x4FE when the temperature
+		* is 25 degrees and the scale factor per milli
+		* degree celcius is -470.
+		*/
 		*val = 25000 / -470 - 1278;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_CALIBBIAS:
-- 
2.7.4