From: Nicolin Chen Date: Wed, 14 Nov 2018 03:48:54 +0000 (-0800) Subject: hwmon: (ina2xx) Fix current value calculation X-Git-Tag: rel_imx_4.19.35_1.1.0~7883 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=3ef0d19cd8156fe122041cb47b3f9fc50ad743b5;p=linux.git hwmon: (ina2xx) Fix current value calculation [ Upstream commit 38cd989ee38c16388cde89db5b734f9d55b905f9 ] The current register (04h) has a sign bit at MSB. The comments for this calculation also mention that it's a signed register. However, the regval is unsigned type so result of calculation turns out to be an incorrect value when current is negative. This patch simply fixes this by adding a casting to s16. Fixes: 5d389b125186c ("hwmon: (ina2xx) Make calibration register value fixed") Signed-off-by: Nicolin Chen Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c index c2252cf452f5..07ee19573b3f 100644 --- a/drivers/hwmon/ina2xx.c +++ b/drivers/hwmon/ina2xx.c @@ -274,7 +274,7 @@ static int ina2xx_get_value(struct ina2xx_data *data, u8 reg, break; case INA2XX_CURRENT: /* signed register, result in mA */ - val = regval * data->current_lsb_uA; + val = (s16)regval * data->current_lsb_uA; val = DIV_ROUND_CLOSEST(val, 1000); break; case INA2XX_CALIBRATION: