/* *  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);