Patch "iio: light: acpi-als: Report data as processed" has been added to the 4.4-stable tree

Patch "iio: light: acpi-als: Report data as processed" 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: light: acpi-als: Report data as processed

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-light-acpi-als-report-data-as-processed.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 fa34e6dd44d7c02c8a8468ce4a52a7506f907bef Mon Sep 17 00:00:00 2001
From: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Date: Tue, 12 Jan 2016 16:21:39 +0100
Subject: iio: light: acpi-als: Report data as processed

From: Gabriele Mazzotta <gabriele.mzt@gmail.com>

commit fa34e6dd44d7c02c8a8468ce4a52a7506f907bef upstream.

As per the ACPI specification (Revision 5.0) [1], the data coming
from the sensor represent the ambient light illuminance reading
expressed in lux. So use IIO_CHAN_INFO_PROCESSED to signify that
the data are pre-processed.

However, to keep backward ABI compatibility, the IIO_CHAN_INFO_RAW
bit is not removed.

[1] http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf

This issue has also been responsible for at least one userspace bug
report hence marking what is a small semantic fix really for stable.
[2] https://github.com/hadess/iio-sensor-proxy/issues/46

Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/iio/light/acpi-als.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/iio/light/acpi-als.c
+++ b/drivers/iio/light/acpi-als.c
@@ -54,7 +54,9 @@ static const struct iio_chan_spec acpi_a
 			.realbits	= 32,
 			.storagebits	= 32,
 		},
-		.info_mask_separate	= BIT(IIO_CHAN_INFO_RAW),
+		/* _RAW is here for backward ABI compatibility */
+		.info_mask_separate	= BIT(IIO_CHAN_INFO_RAW) |
+					  BIT(IIO_CHAN_INFO_PROCESSED),
 	},
 };
 
@@ -152,7 +154,7 @@ static int acpi_als_read_raw(struct iio_
 	s32 temp_val;
 	int ret;
 
-	if (mask != IIO_CHAN_INFO_RAW)
+	if ((mask != IIO_CHAN_INFO_PROCESSED) && (mask != IIO_CHAN_INFO_RAW))
 		return -EINVAL;
 
 	/* we support only illumination (_ALI) so far. */


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

queue-4.4/iio-light-acpi-als-report-data-as-processed.patch