From 1d93353da536d3403ac291dc96070f434f6cf285 Mon Sep 17 00:00:00 2001
From: Irina Tirdea <irina.tirdea@intel.com>
Date: Mon, 13 Apr 2015 18:40:49 +0300
Subject: [PATCH] iio: accel: mma9553: check input value for activity period

When setting the activity period, the value introduced by
the user in sysfs is not checked for validity.

Add a boundary check so that only allowed values are
reported as successfully written to device.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Reported-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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