diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2011-11-02 09:40:00 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-26 16:39:58 -0800 |
| commit | 43c0364551d3ca0042f6f6a3da701edf1143d62f (patch) | |
| tree | 39d7284537763aa1334d87cdcdd22ac052d36197 | |
| parent | 685e010748f64a752a981254101e976d7291d16c (diff) | |
staging:iio: Make write_event_value callback optional
Some devices have fixed thresholds which can not be modified so make the
write_event_value callback optional, so the drivers for these devices do not
have to implement a boilerplate no-op callback.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/staging/iio/industrialio-core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c index dc2339ae63d..0b671663b55 100644 --- a/drivers/staging/iio/industrialio-core.c +++ b/drivers/staging/iio/industrialio-core.c @@ -790,6 +790,9 @@ static ssize_t iio_ev_value_store(struct device *dev, unsigned long val; int ret; + if (!indio_dev->info->write_event_value) + return -EINVAL; + ret = strict_strtoul(buf, 10, &val); if (ret) return ret; |