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staging:iio: Make write_event_value callback optional

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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>
This commit is contained in:
Lars-Peter Clausen 2011-11-02 09:40:00 +01:00 committed by Greg Kroah-Hartman
parent 685e010748
commit 43c0364551
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/iio/industrialio-core.c
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@ -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;