From 2a96540a5c0d136c3c412ec650fad301aaf12bf7 Mon Sep 17 00:00:00 2001
From: Reyad Attiyat <reyad.attiyat@gmail.com>
Date: Thu, 17 Jul 2014 19:18:00 +0100
Subject: [PATCH] iio: hid-sensor-magn-3d: Scan for usage attributes before
 setting up iio channels

Scan for and count the HID usage attributes supported by the driver.
This allows for the driver to only setup the IIO channels for the
sensor usages present in the HID USB reports.

Changes from v5
-Fixed kernel panic from invalid pointer dereference
-Fixed variable assignment style

Signed-off-by: Reyad Attiyat <reyad.attiyat@gmail.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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