1b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel/* 2b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * Generic DT helper functions for touchscreen devices 3b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * 4b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * Copyright (c) 2014 Sebastian Reichel <sre@kernel.org> 5b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * 6b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * This program is free software; you can redistribute it and/or modify 7b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * it under the terms of the GNU General Public License version 2 as 8b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * published by the Free Software Foundation. 9b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * 10b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel */ 11b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel 12b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel#include <linux/of.h> 13b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel#include <linux/input.h> 14b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel#include <linux/input/touchscreen.h> 15b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel 16b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel/** 17b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * touchscreen_parse_of_params - parse common touchscreen DT properties 18b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * @dev: device that should be parsed 19b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * 20b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * This function parses common DT properties for touchscreens and setups the 21b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * input device accordingly. The function keeps previously setuped default 22b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel * values if no value is specified via DT. 23b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel */ 24b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichelvoid touchscreen_parse_of_params(struct input_dev *dev) 25b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel{ 26b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel struct device_node *np = dev->dev.parent->of_node; 27b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel struct input_absinfo *absinfo; 28b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel 29b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel input_alloc_absinfo(dev); 30b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel if (!dev->absinfo) 31b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel return; 32b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel 33b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel absinfo = &dev->absinfo[ABS_X]; 34b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel of_property_read_u32(np, "touchscreen-size-x", &absinfo->maximum); 35b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel of_property_read_u32(np, "touchscreen-fuzz-x", &absinfo->fuzz); 36b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel 37b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel absinfo = &dev->absinfo[ABS_Y]; 38b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel of_property_read_u32(np, "touchscreen-size-y", &absinfo->maximum); 39b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel of_property_read_u32(np, "touchscreen-fuzz-y", &absinfo->fuzz); 40b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel 41b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel absinfo = &dev->absinfo[ABS_PRESSURE]; 42b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel of_property_read_u32(np, "touchscreen-max-pressure", &absinfo->maximum); 43b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel of_property_read_u32(np, "touchscreen-fuzz-pressure", &absinfo->fuzz); 44b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian Reichel} 45b98abe52fa8e2a3797d3cc2db3d0e109f4549c03Sebastian ReichelEXPORT_SYMBOL(touchscreen_parse_of_params); 46