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