From b98abe52fa8e2a3797d3cc2db3d0e109f4549c03 Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Wed, 28 May 2014 23:51:53 -0700 Subject: Input: add common DT binding for touchscreens Add common DT binding documentation for touchscreen devices and implement input_parse_touchscreen_of_params, which parses the common properties and configures the input device accordingly. The method currently does not interpret the axis inversion properties, since there is no matching flag in the generic linux input device. Reviewed-by: Pavel Machek Acked-by: Aaro Koskinen Signed-off-by: Sebastian Reichel Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/of_touchscreen.c | 45 ++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 drivers/input/touchscreen/of_touchscreen.c (limited to 'drivers/input/touchscreen/of_touchscreen.c') diff --git a/drivers/input/touchscreen/of_touchscreen.c b/drivers/input/touchscreen/of_touchscreen.c new file mode 100644 index 00000000000..f8f9b84230b --- /dev/null +++ b/drivers/input/touchscreen/of_touchscreen.c @@ -0,0 +1,45 @@ +/* + * Generic DT helper functions for touchscreen devices + * + * Copyright (c) 2014 Sebastian Reichel + * + * 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 +#include +#include + +/** + * 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); -- cgit v1.2.3-70-g09d2