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bq27000: report missing device better.

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One an hdq buss, a missing device reads as 0xff, not -1.
So do a translation to allow detecting of a missing bus.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Marek Belisko 2014-06-30 21:49:56 +02:00 committed by Sebastian Reichel
parent 1cb82fdb2a
commit 3dd843e1c2
1 changed files with 3 additions and 0 deletions
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3
drivers/power/bq27x00_battery.c
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@ -416,6 +416,9 @@ 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)) {