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power: supply: max17042_battery: Use sign_extend32 instead of DIY code

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Use sign_extend32 to sign-extend variables where necessary instead of
DIY code.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Hans de Goede 2017-04-14 20:32:47 +02:00 committed by Sebastian Reichel
parent 7f232af356
commit c67c06939e
1 changed files with 3 additions and 21 deletions
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24
drivers/power/supply/max17042_battery.c
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@ -106,13 +106,7 @@ static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
if (ret < 0)
return ret;
*temp = data;
/* The value is signed. */
if (*temp & 0x8000) {
*temp = (0x7fff & ~*temp) + 1;
*temp *= -1;
}
*temp = sign_extend32(data, 15);
/* The value is converted into deci-centigrade scale */
/* Units of LSB = 1 / 256 degree Celsius */
*temp = *temp * 10 / 256;
@ -302,13 +296,7 @@ static int max17042_get_property(struct power_supply *psy,
if (ret < 0)
return ret;
val->intval = data;
if (val->intval & 0x8000) {
/* Negative */
val->intval = ~val->intval & 0x7fff;
val->intval++;
val->intval *= -1;
}
val->intval = sign_extend32(data, 15);
val->intval *= 1562500 / chip->pdata->r_sns;
} else {
return -EINVAL;
@ -320,13 +308,7 @@ static int max17042_get_property(struct power_supply *psy,
if (ret < 0)
return ret;
val->intval = data;
if (val->intval & 0x8000) {
/* Negative */
val->intval = ~val->intval & 0x7fff;
val->intval++;
val->intval *= -1;
}
val->intval = sign_extend32(data, 15);
val->intval *= 1562500 / chip->pdata->r_sns;
} else {
return -EINVAL;