Patch "iio: chemical: ccs811: Fix output of IIO_CONCENTRATION channels" has been added to the 4.14-stable tree

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

iio: chemical: ccs811: Fix output of IIO_CONCENTRATION channels

to the 4.14-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-chemical-ccs811-fix-output-of-iio_concentration-channels.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Narcisa Ana Maria Vasile <[email protected]>
Date: Wed, 6 Dec 2017 18:57:58 +0200
Subject: iio: chemical: ccs811: Fix output of IIO_CONCENTRATION channels

From: Narcisa Ana Maria Vasile <[email protected]>

commit 8f114acd4e1a9cfa05b70bcc4219bc88197b5c9b upstream.

in_concentration_raw should report, according to sysfs-bus-iio documentation, a "Raw (unscaled no offset etc.) percentage reading of a substance."

Modify scale to convert from ppm/ppb to percentage:
1 ppm = 0.0001%
1 ppb = 0.0000001%

There is no offset needed to convert the ppm/ppb to percentage, so remove offset from IIO_CONCENTRATION (IIO_MOD_CO2) channel.

Cc'd stable to reduce chance of userspace breakage in the long run as we fix this wrong bit of ABI usage.

---
 drivers/iio/chemical/ccs811.c |   13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

@@ -91,7 +91,6 @@ static const struct iio_chan_spec ccs811
 		.channel2 = IIO_MOD_CO2,
 		.modified = 1,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
-				      BIT(IIO_CHAN_INFO_OFFSET) |
 				      BIT(IIO_CHAN_INFO_SCALE),
 		.scan_index = 0,
 		.scan_type = {

@@ -245,24 +244,18 @@ static int ccs811_read_raw(struct iio_de
 			switch (chan->channel2) {
 			case IIO_MOD_CO2:
 				*val = 0;
-				*val2 = 12834;
+				*val2 = 100;
 				return IIO_VAL_INT_PLUS_MICRO;
 			case IIO_MOD_VOC:
 				*val = 0;
-				*val2 = 84246;
-				return IIO_VAL_INT_PLUS_MICRO;
+				*val2 = 100;
+				return IIO_VAL_INT_PLUS_NANO;
 			default:
 				return -EINVAL;
 			}
 		default:
 			return -EINVAL;
 		}
-	case IIO_CHAN_INFO_OFFSET:
-		if (!(chan->type == IIO_CONCENTRATION &&
-		      chan->channel2 == IIO_MOD_CO2))
-			return -EINVAL;
-		*val = -400;
-		return IIO_VAL_INT;
 	default:
 		return -EINVAL;
 	}

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/iio-chemical-ccs811-fix-output-of-iio_concentration-channels.patch