1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/of_touchscreen.c b/drivers/input/touchscreen/of_touchscreen.c
new file mode 100644
index 000000000000..f8f9b84230b1
--- /dev/null
+++ b/drivers/input/touchscreen/of_touchscreen.c
@@ -0,0 +1,45 @@
+/*
+ *  Generic DT helper functions for touchscreen devices
+ *
+ *  Copyright (c) 2014 Sebastian Reichel <sre@kernel.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/of.h>
+#include <linux/input.h>
+#include <linux/input/touchscreen.h>
+
+/**
+ * touchscreen_parse_of_params - parse common touchscreen DT properties
+ * @dev: device that should be parsed
+ *
+ * This function parses common DT properties for touchscreens and setups the
+ * input device accordingly. The function keeps previously setuped default
+ * values if no value is specified via DT.
+ */
+void touchscreen_parse_of_params(struct input_dev *dev)
+{
+        struct device_node *np = dev->dev.parent->of_node;
+        struct input_absinfo *absinfo;
+
+        input_alloc_absinfo(dev);
+        if (!dev->absinfo)
+                return;
+
+        absinfo = &dev->absinfo[ABS_X];
+        of_property_read_u32(np, "touchscreen-size-x", &absinfo->maximum);
+        of_property_read_u32(np, "touchscreen-fuzz-x", &absinfo->fuzz);
+
+        absinfo = &dev->absinfo[ABS_Y];
+        of_property_read_u32(np, "touchscreen-size-y", &absinfo->maximum);
+        of_property_read_u32(np, "touchscreen-fuzz-y", &absinfo->fuzz);
+
+        absinfo = &dev->absinfo[ABS_PRESSURE];
+        of_property_read_u32(np, "touchscreen-max-pressure", &absinfo->maximum);
+        of_property_read_u32(np, "touchscreen-fuzz-pressure", &absinfo->fuzz);
+}
+EXPORT_SYMBOL(touchscreen_parse_of_params);