This is a note to let you know that I've just added the patch titled
hwmon: (ina2xx) Cast to s16 on shunt and current regs
to the 3.15-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:
hwmon-ina2xx-cast-to-s16-on-shunt-and-current-regs.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c0214f98943b1fe43f7be61b7782b0c8f0836f28 Mon Sep 17 00:00:00 2001
From: Fabio Baltieri <fabio.baltieri@xxxxxxxxx>
Date: Sun, 8 Jun 2014 22:06:24 +0100
Subject: hwmon: (ina2xx) Cast to s16 on shunt and current regs
From: Fabio Baltieri <fabio.baltieri@xxxxxxxxx>
commit c0214f98943b1fe43f7be61b7782b0c8f0836f28 upstream.
All devices supported by ina2xx are bidirectional and report the
measured shunt voltage and power values as a signed 16 bit, but the
current driver implementation caches all registers as u16, leading
to an incorrect sign extension when reporting to userspace in
ina2xx_get_value().
This patch fixes the problem by casting the signed registers to s16.
Tested on an INA219.
Signed-off-by: Fabio Baltieri <fabio.baltieri@xxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hwmon/ina2xx.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/hwmon/ina2xx.c
+++ b/drivers/hwmon/ina2xx.c
@@ -148,7 +148,8 @@ static int ina2xx_get_value(struct ina2x
switch (reg) {
case INA2XX_SHUNT_VOLTAGE:
- val = DIV_ROUND_CLOSEST(data->regs[reg],
+ /* signed register */
+ val = DIV_ROUND_CLOSEST((s16)data->regs[reg],
data->config->shunt_div);
break;
case INA2XX_BUS_VOLTAGE:
@@ -160,8 +161,8 @@ static int ina2xx_get_value(struct ina2x
val = data->regs[reg] * data->config->power_lsb;
break;
case INA2XX_CURRENT:
- /* LSB=1mA (selected). Is in mA */
- val = data->regs[reg];
+ /* signed register, LSB=1mA (selected), in mA */
+ val = (s16)data->regs[reg];
break;
default:
/* programmer goofed */
Patches currently in stable-queue which might be from fabio.baltieri@xxxxxxxxx are
queue-3.15/hwmon-ina2xx-cast-to-s16-on-shunt-and-current-regs.patch
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