drivers/input/touchscreen.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  *  Generic helper functions for touchscreens and other two-dimensional
12 #include <linux/input/touchscreen.h>
35 				   int min, int max, int fuzz)
39 	if (!test_bit(axis, dev->absbit)) {
40 		dev_warn(&dev->dev,
46 	absinfo = &dev->absinfo[axis];
47 	absinfo->minimum = min;
48 	absinfo->maximum = max;
49 	absinfo->fuzz = fuzz;
53  * touchscreen_parse_properties - parse common touchscreen properties
56  *	single-touch or multi-touch axes
68 	struct device *dev = input->dev.parent;
75 	if (!input->absinfo)
81 	data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-x",
84 	data_present |= touchscreen_get_prop_u32(dev, "touchscreen-size-x",
88 	data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x",
92 		touchscreen_set_params(input, axis_x, minimum, maximum - 1, fuzz);
94 	data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-y",
97 	data_present |= touchscreen_get_prop_u32(dev, "touchscreen-size-y",
101 	data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y",
105 		touchscreen_set_params(input, axis_y, minimum, maximum - 1, fuzz);
109 						"touchscreen-max-pressure",
113 						 "touchscreen-fuzz-pressure",
122 	prop->max_x = input_abs_get_max(input, axis_x);
123 	prop->max_y = input_abs_get_max(input, axis_y);
125 	prop->invert_x =
126 		device_property_read_bool(dev, "touchscreen-inverted-x");
127 	if (prop->invert_x) {
128 		absinfo = &input->absinfo[axis_x];
129 		absinfo->maximum -= absinfo->minimum;
130 		absinfo->minimum = 0;
133 	prop->invert_y =
134 		device_property_read_bool(dev, "touchscreen-inverted-y");
135 	if (prop->invert_y) {
136 		absinfo = &input->absinfo[axis_y];
137 		absinfo->maximum -= absinfo->minimum;
138 		absinfo->minimum = 0;
141 	prop->swap_x_y =
142 		device_property_read_bool(dev, "touchscreen-swapped-x-y");
143 	if (prop->swap_x_y)
144 		swap(input->absinfo[axis_x], input->absinfo[axis_y]);
152 	if (prop->invert_x)
153 		*x = prop->max_x - *x;
155 	if (prop->invert_y)
156 		*y = prop->max_y - *y;
158 	if (prop->swap_x_y)
163  * touchscreen_set_mt_pos - Set input_mt_pos coordinates
178 	pos->x = x;
179 	pos->y = y;
184  * touchscreen_report_pos - Report touchscreen coordinates
189  * @multitouch: Report coordinates on single-touch or multi-touch axes