From 0383024f811aa469df258039807810fc3793a105 Mon Sep 17 00:00:00 2001
From: Jonathan Bakker <xc-racer2@live.ca>
Date: Mon, 4 May 2020 15:12:58 -0700
Subject: [PATCH] power: supply: max17040: Correct voltage reading
Git-commit: 0383024f811aa469df258039807810fc3793a105
Patch-mainline: v5.8-rc1
References: git-fixes

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/power/supply/max17040_battery.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c
index 8a1f0ee493aa..48aa44665e2f 100644
--- a/drivers/power/supply/max17040_battery.c
+++ b/drivers/power/supply/max17040_battery.c
@@ -126,7 +126,7 @@ 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)
-- 
2.16.4