power: supply: max17040: Correct voltage reading

[ Upstream commit 0383024f811aa469df258039807810fc3793a105 ]

According to the datasheet available at (1), the bottom four
bits are always zero and the actual voltage is 1.25x this value
in mV.  Since the kernel API specifies that voltages should be in
uV, it should report 1250x the shifted value.

1) https://datasheets.maximintegrated.com/en/ds/MAX17040-MAX17041.pdf

Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c
index 33c40f79d23d5e016e69ecde3d0f5785ba4048c0..2c35c13ad546f8e902eb13a1742c4c6304379c65 100644 (file)
--- a/drivers/power/supply/max17040_battery.c
+++ b/drivers/power/supply/max17040_battery.c
@@ -109,7 +109,7 @@ static void max17040_get_vcell(struct i2c_client *client)
 
        vcell = max17040_read_reg(client, MAX17040_VCELL);
 
-       chip->vcell = vcell;
+       chip->vcell = (vcell >> 4) * 1250;
 }
 
 static void max17040_get_soc(struct i2c_client *client)