From: Linus Walleij <linus.walleij@linaro.org>
Date: Tue, 11 Aug 2015 12:34:38 +0000 (+0200)
Subject: iio: event_monitor: report unsupported events
X-Git-Tag: v4.4-rc1~125^2~1379^2~54
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=672f93b6047cc724f002cf50a84f4e8155b86f12;p=linux.git

iio: event_monitor: report unsupported events

This makes the event monitor bail out with a helpful error
message if a device does not support events, as a related
fix to iio core now makes it return -ENODEV properly.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---

diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index cd3fd41b481d..d51eb04202e9 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -284,7 +284,11 @@ int main(int argc, char **argv)
 	ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
 	if (ret == -1 || event_fd == -1) {
 		ret = -errno;
-		fprintf(stderr, "Failed to retrieve event fd\n");
+		if (ret == -ENODEV)
+			fprintf(stderr,
+				"This device does not support events\n");
+		else
+			fprintf(stderr, "Failed to retrieve event fd\n");
 		if (close(fd) == -1)
 			perror("Failed to close character device file");