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>
unsigned long val;
int ret;
+ if (!indio_dev->info->write_event_value)
+ return -EINVAL;
+
ret = strict_strtoul(buf, 10, &val);
if (ret)
return ret;