linux-kernel - [PATCH] bq27x00_battery: Do not report nominal available capaciy if battery is not calibrated

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Date:	Sat, 10 Nov 2012 15:42:48 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Anton Vorontsov <cbouatmailru@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH] bq27x00_battery: Do not report nominal available capaciy if battery is not calibrated

Signed-off-by: Pali Rohár <pali.rohar@...il.com>
---
 drivers/power/bq27x00_battery.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 5860d4d..41b3328 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -230,6 +230,14 @@ static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
  */
 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
 {
+	int flags;
+	bool is_bq27500 = di->chip == BQ27500;
+	bool is_higher = bq27xxx_is_chip_version_higher(di);
+
+	flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
+	if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
+		return -ENODATA;
+
 	return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
 }
 
-- 
1.7.10.4

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