forked from Minki/linux
0a363a3809
So far, the DT parsing code was only setting up the regular input axes, completely ignoring their multitouch counter parts. Fill them with the same parameters than the regular axes. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
88 lines
2.4 KiB
C
88 lines
2.4 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/mt.h>
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#include <linux/input/touchscreen.h>
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static u32 of_get_optional_u32(struct device_node *np,
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const char *property)
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{
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u32 val = 0;
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of_property_read_u32(np, property, &val);
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return val;
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}
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static void touchscreen_set_params(struct input_dev *dev,
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unsigned long axis,
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int max, int fuzz)
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{
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struct input_absinfo *absinfo;
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if (!test_bit(axis, dev->absbit)) {
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/*
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* Emit a warning only if the axis is not a multitouch
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* axis, which might not be set by the driver.
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*/
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if (!input_is_mt_axis(axis))
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dev_warn(&dev->dev,
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"DT specifies parameters but the axis is not set up\n");
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return;
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}
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absinfo = &dev->absinfo[axis];
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absinfo->maximum = max;
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absinfo->fuzz = fuzz;
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}
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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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u32 maximum, fuzz;
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input_alloc_absinfo(dev);
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if (!dev->absinfo)
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return;
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maximum = of_get_optional_u32(np, "touchscreen-size-x");
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fuzz = of_get_optional_u32(np, "touchscreen-fuzz-x");
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if (maximum || fuzz) {
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touchscreen_set_params(dev, ABS_X, maximum, fuzz);
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touchscreen_set_params(dev, ABS_MT_POSITION_X, maximum, fuzz);
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}
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maximum = of_get_optional_u32(np, "touchscreen-size-y");
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fuzz = of_get_optional_u32(np, "touchscreen-fuzz-y");
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if (maximum || fuzz) {
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touchscreen_set_params(dev, ABS_Y, maximum, fuzz);
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touchscreen_set_params(dev, ABS_MT_POSITION_Y, maximum, fuzz);
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}
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maximum = of_get_optional_u32(np, "touchscreen-max-pressure");
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fuzz = of_get_optional_u32(np, "touchscreen-fuzz-pressure");
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if (maximum || fuzz) {
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touchscreen_set_params(dev, ABS_PRESSURE, maximum, fuzz);
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touchscreen_set_params(dev, ABS_MT_PRESSURE, maximum, fuzz);
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}
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}
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EXPORT_SYMBOL(touchscreen_parse_of_params);
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