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/*
* 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);
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