Patch "iio: hudmidity: hdc100x: fix incorrect shifting and scaling" has been added to the 4.4-stable tree

Patch "iio: hudmidity: hdc100x: fix incorrect shifting and scaling" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    iio: hudmidity: hdc100x: fix incorrect shifting and scaling

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     iio-hudmidity-hdc100x-fix-incorrect-shifting-and-scaling.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 94bef000f1d4aa111f4ddda1482cf3b30ad069ce Mon Sep 17 00:00:00 2001
From: Matt Ranostay <mranostay@gmail.com>
Date: Sun, 29 May 2016 19:52:02 -0700
Subject: iio: hudmidity: hdc100x: fix incorrect shifting and scaling

From: Matt Ranostay <mranostay@gmail.com>

commit 94bef000f1d4aa111f4ddda1482cf3b30ad069ce upstream.

Shifting sensor data to the right 2 bits was incorrect and caused the
scaling values + offsets to be invalid.

Reported-by: Alison Schofield <amsfield22@gmail.com>
Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Tested-by: Alison Schofield <amsfield22@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/iio/humidity/hdc100x.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/drivers/iio/humidity/hdc100x.c
+++ b/drivers/iio/humidity/hdc100x.c
@@ -164,14 +164,14 @@ static int hdc100x_get_measurement(struc
 		dev_err(&client->dev, "cannot read high byte measurement");
 		return ret;
 	}
-	val = ret << 6;
+	val = ret << 8;
 
 	ret = i2c_smbus_read_byte(client);
 	if (ret < 0) {
 		dev_err(&client->dev, "cannot read low byte measurement");
 		return ret;
 	}
-	val |= ret >> 2;
+	val |= ret;
 
 	return val;
 }
@@ -212,17 +212,17 @@ static int hdc100x_read_raw(struct iio_d
 	case IIO_CHAN_INFO_SCALE:
 		if (chan->type == IIO_TEMP) {
 			*val = 165000;
-			*val2 = 65536 >> 2;
+			*val2 = 65536;
 			return IIO_VAL_FRACTIONAL;
 		} else {
-			*val = 0;
-			*val2 = 10000;
-			return IIO_VAL_INT_PLUS_MICRO;
+			*val = 100;
+			*val2 = 65536;
+			return IIO_VAL_FRACTIONAL;
 		}
 		break;
 	case IIO_CHAN_INFO_OFFSET:
-		*val = -3971;
-		*val2 = 879096;
+		*val = -15887;
+		*val2 = 515151;
 		return IIO_VAL_INT_PLUS_MICRO;
 	default:
 		return -EINVAL;


Patches currently in stable-queue which might be from mranostay@gmail.com are

queue-4.4/iio-hudmidity-hdc100x-fix-incorrect-shifting-and-scaling.patch
queue-4.4/iio-proximity-as3935-fix-buffer-stack-trashing.patch
queue-4.4/iio-light-apds9960-add-the-missing-dev.parent.patch
queue-4.4/iio-proximity-as3935-correct-iio_chan_info_raw-output.patch
queue-4.4/iio-proximity-as3935-remove-triggered-buffer-processing.patch
queue-4.4/iio-humidity-hdc100x-correct-humidity-integration-time-mask.patch
queue-4.4/iio-humidity-hdc100x-fix-iio_temp-channel-reporting.patch