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@xxxxxxxxxx> Acked-by: Jonathan Cameron <jic23@xxxxxxxxx> --- 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 cfa4fcb..d2eea07 100644 --- a/drivers/staging/iio/industrialio-core.c +++ b/drivers/staging/iio/industrialio-core.c @@ -782,6 +782,9 @@ 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; -- 1.7.7 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
