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| author |   Marek Belisko <marek@goldelico.com> | 2014-06-30 21:49:56 +0200 |
|---|---|---|
| committer |   Sebastian Reichel <sre@kernel.org> | 2014-07-18 23:40:22 +0200 |
| commit | 3dd843e1c26a023dc8d776e5d984c635c642785f (patch) | |
| tree | ef5a65a69280bc6d2aa3e2a88a625b1609a7847d /drivers/power/bq27x00_battery.c | |
| parent | bq27x00_battery: Introduce the use of the managed version of kzalloc (diff) | |
| download | linux-dev-3dd843e1c26a023dc8d776e5d984c635c642785f.tar.xz linux-dev-3dd843e1c26a023dc8d776e5d984c635c642785f.zip | |
bq27000: report missing device better.
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>
Diffstat (limited to 'drivers/power/bq27x00_battery.c')
| -rw-r--r-- | drivers/power/bq27x00_battery.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c index a0f205b0471d..e10763e3a1d5 100644 --- a/drivers/power/bq27x00_battery.c +++ b/drivers/power/bq27x00_battery.c @@ -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)) { |