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authorH. Nikolaus Schaller <hns@goldelico.com>2016-07-18 18:12:09 +0200
committerSebastian Reichel <sre@kernel.org>2016-08-15 21:26:52 +0200
commite4a404a081df1abe95a06ab24b7c76d8cf02402f (patch)
tree9d1899a275dc5d66b76b7846a77e4ed5ca9f0b71 /drivers/power
parent47d7d5ed68d877269003a392b7008905d65650bb (diff)
downloadlinux-e4a404a081df1abe95a06ab24b7c76d8cf02402f.tar.bz2
power:bq27xxx: 27000/10 read FLAGS register as single
The bq27000 and bq27010 have a single byte FLAGS register. Other gauges have 16 bit FLAGS registers. For reading the FLAGS register it is sufficient to read the single register instead of reading RSOC at the next higher address as well and then ignore the high byte. This does not change functionality but optimizes i2c and hdq traffic. Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com> Acked-by: Pali Rohár <pali.rohar@gmail.com> Acked-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/supply/bq27xxx_battery.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
index 323d05a12f9b..3f57dd54803a 100644
--- a/drivers/power/supply/bq27xxx_battery.c
+++ b/drivers/power/supply/bq27xxx_battery.c
@@ -644,8 +644,9 @@ static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
{
int flags;
+ bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
- flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
+ flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
if (flags < 0) {
dev_err(di->dev, "error reading flag register:%d\n", flags);
return flags;
@@ -745,7 +746,7 @@ static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
}
if (di->chip == BQ27000 || di->chip == BQ27010) {
- flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
+ flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
if (flags & BQ27000_FLAG_CHGS) {
dev_dbg(di->dev, "negative current!\n");
curr = -curr;