This is a note to let you know that I've just added the patch titled
iio: dac: cio-dac: Fix max DAC write value check for 12-bit
to the 4.19-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-dac-cio-dac-fix-max-dac-write-value-check-for-12-bit.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c3701185ee1973845db088d8b0fc443397ab0eb2 Mon Sep 17 00:00:00 2001
From: William Breathitt Gray <william.gray@xxxxxxxxxx>
Date: Fri, 10 Mar 2023 19:22:48 -0500
Subject: iio: dac: cio-dac: Fix max DAC write value check for 12-bit
From: William Breathitt Gray <william.gray@xxxxxxxxxx>
commit c3701185ee1973845db088d8b0fc443397ab0eb2 upstream.
The CIO-DAC series of devices only supports DAC values up to 12-bit
rather than 16-bit. Trying to write a 16-bit value results in only the
lower 12 bits affecting the DAC output which is not what the user
expects. Instead, adjust the DAC write value check to reject values
larger than 12-bit so that they fail explicitly as invalid for the user.
Fixes: 3b8df5fd526e ("iio: Add IIO support for the Measurement Computing CIO-DAC family")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: William Breathitt Gray <william.gray@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230311002248.8548-1-william.gray@xxxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/dac/cio-dac.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/iio/dac/cio-dac.c
+++ b/drivers/iio/dac/cio-dac.c
@@ -74,8 +74,8 @@ static int cio_dac_write_raw(struct iio_
if (mask != IIO_CHAN_INFO_RAW)
return -EINVAL;
- /* DAC can only accept up to a 16-bit value */
- if ((unsigned int)val > 65535)
+ /* DAC can only accept up to a 12-bit value */
+ if ((unsigned int)val > 4095)
return -EINVAL;
priv->chan_out_states[chan->channel] = val;
Patches currently in stable-queue which might be from william.gray@xxxxxxxxxx are
queue-4.19/iio-dac-cio-dac-fix-max-dac-write-value-check-for-12-bit.patch
