linux-kernel - [PATCH] bq270x0: minor improvements for daily operation

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Date:	Thu, 10 Apr 2014 11:30:07 +0200
From:	"Dr. H. Nikolaus Schaller" <hns@...delico.com>
To:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>
Cc:	Marek Belisko <marek@...delico.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] bq270x0: minor improvements for daily operation

Improve operation on OpenPhoenux GTA04 board:
* treat receiving 0xff from the 1-wire layer as a missing battery
* print calibration warning only in debug mode to keep dmesg clean

Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
---
 drivers/power/bq27x00_battery.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index b309713..fa15dc9 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -415,10 +415,13 @@ static void bq27x00_update(struct bq27x00_device_info *di)
 	bool is_bq27425 = di->chip == BQ27425;
 
 	cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
+	if ((cache.flags & 0xff) == 0xff)
+		/* read error */
+		cache.flags = -1;
 	if (cache.flags >= 0) {
 		if (!is_bq27500 && !is_bq27425
 				&& (cache.flags & BQ27000_FLAG_CI)) {
-			dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
+			dev_dbg(di->dev, "battery is not calibrated! ignoring capacity values\n");
 			cache.capacity = -ENODATA;
 			cache.energy = -ENODATA;
 			cache.time_to_empty = -ENODATA;
-- 
1.9.1


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