This is a note to let you know that I've just added the patch titled
iio: temperature: mcp9600: Fix temperature reading for negative
to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-testing branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will be merged to the char-misc-next branch sometime soon,
after it passes testing, and the merge window is open.
If you have any questions about this process, please let me know.
>From 827dca3129708a8465bde90c86c2e3c38e62dd4f Mon Sep 17 00:00:00 2001
From: Dimitri Fedrau <dima.fedrau@xxxxxxxxx>
Date: Wed, 24 Apr 2024 20:59:10 +0200
Subject: iio: temperature: mcp9600: Fix temperature reading for negative
values
Temperature is stored as 16bit value in two's complement format. Current
implementation ignores the sign bit. Make it aware of the sign bit by
using sign_extend32.
Fixes: 3f6b9598b6df ("iio: temperature: Add MCP9600 thermocouple EMF converter")
Signed-off-by: Dimitri Fedrau <dima.fedrau@xxxxxxxxx>
Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@xxxxxxxxx>
Tested-by: Andrew Hepp <andrew.hepp@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240424185913.1177127-1-dima.fedrau@xxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
drivers/iio/temperature/mcp9600.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/temperature/mcp9600.c b/drivers/iio/temperature/mcp9600.c
index 46845804292b..7a3eef5d5e75 100644
--- a/drivers/iio/temperature/mcp9600.c
+++ b/drivers/iio/temperature/mcp9600.c
@@ -52,7 +52,8 @@ static int mcp9600_read(struct mcp9600_data *data,
if (ret < 0)
return ret;
- *val = ret;
+
+ *val = sign_extend32(ret, 15);
return 0;
}
--
2.45.0
