linux-kernel - [PATCH] bq2415x_charger: fix max battery regulation voltage

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Date:	Wed, 16 Oct 2013 16:08:31 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Anton Vorontsov <anton@...msg.org>
Cc:	linux-kernel@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH] bq2415x_charger: fix max battery regulation voltage

As per the datasheets, maximum battery regulation voltage is 4440mV.

The formula is (voltage - offset) / step, so the maximum value is:
(4440 - 3500) / 20 = 47

Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 drivers/power/bq2415x_charger.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/power/bq2415x_charger.c b/drivers/power/bq2415x_charger.c
index 0727f92..df893dd 100644
--- a/drivers/power/bq2415x_charger.c
+++ b/drivers/power/bq2415x_charger.c
@@ -605,9 +605,13 @@ static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq,
 {
 	int val = (mV/10 - 350) / 2;
 
+	/*
+	 * According to datasheet, maximum battery regulation voltage is
+	 * 4440mV which is b101111 = 47.
+	 */
 	if (val < 0)
 		val = 0;
-	else if (val > 94) /* FIXME: Max is 94 or 122 ? Set max value ? */
+	else if (val > 47)
 		return -EINVAL;
 
 	return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val,
-- 
1.8.1.2

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