From: Lars-Peter Clausen <lars@metafoo.de>
Date: Wed, 2 Nov 2011 08:40:00 +0000 (+0100)
Subject: staging:iio: Make write_event_value callback optional
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=43c0364551d3ca0042f6f6a3da701edf1143d62f;p=openwrt%2Fstaging%2Fblogic.git

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>
---

diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c
index dc2339ae63d0..0b671663b55d 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;