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Mon, 4 May 2020 22:13:28 +0000 From: Jonathan Bakker <xc-racer2@live.ca> To: sre@kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, devicetree@vger.kernel.org Cc: Jonathan Bakker <xc-racer2@live.ca> Subject: [PATCH 1/3] power: supply: max17040: Correct voltage reading Date: Mon, 4 May 2020 15:12:58 -0700 Message-ID: <BN6PR04MB0660DA4AED9364441DA33094A3A60@BN6PR04MB0660.namprd04.prod.outlook.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200504221300.3153-1-xc-racer2@live.ca> References: <20200504221300.3153-1-xc-racer2@live.ca> Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-ClientProxiedBy: MWHPR2201CA0053.namprd22.prod.outlook.com (2603:10b6:301:16::27) To BN6PR04MB0660.namprd04.prod.outlook.com (2603:10b6:404:d9::21) X-Microsoft-Original-Message-ID: <20200504221300.3153-2-xc-racer2@live.ca> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from jon-hp-6570b.telus (2001:569:fb68:9c00:8067:f823:1e15:7520) by MWHPR2201CA0053.namprd22.prod.outlook.com (2603:10b6:301:16::27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2958.19 via Frontend Transport; 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[1/3] power: supply: max17040: Correct voltage reading
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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)
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> --- drivers/power/supply/max17040_battery.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)