1 // SPDX-License-Identifier: GPL-2.0-only
3  *  Generic helper functions for touchscreens and other two-dimensional
10 #include <linux/input.h>
11 #include <linux/input/mt.h>
12 #include <linux/input/touchscreen.h>
18 				     unsigned int *value)  in touchscreen_get_prop_u32()  argument
25 		*value = default_value;  in touchscreen_get_prop_u32()
29 	*value = val;  in touchscreen_get_prop_u32()
39 	if (!test_bit(axis, dev->absbit)) {  in touchscreen_set_params()
40 		dev_warn(&dev->dev,  in touchscreen_set_params()
46 	absinfo = &dev->absinfo[axis];  in touchscreen_set_params()
47 	absinfo->minimum = min;  in touchscreen_set_params()
48 	absinfo->maximum = max;  in touchscreen_set_params()
49 	absinfo->fuzz = fuzz;  in touchscreen_set_params()
53  * touchscreen_parse_properties - parse common touchscreen properties
54  * @input: input device that should be parsed
56  *	single-touch or multi-touch axes
62  * input device accordingly. The function keeps previously set up default
63  * values if no value is specified.
65 void touchscreen_parse_properties(struct input_dev *input, bool multitouch,  in touchscreen_parse_properties()  argument
68 	struct device *dev = input->dev.parent;  in touchscreen_parse_properties()
74 	input_alloc_absinfo(input);  in touchscreen_parse_properties()
75 	if (!input->absinfo)  in touchscreen_parse_properties()
81 	data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-x",  in touchscreen_parse_properties()
82 						input_abs_get_min(input, axis_x),  in touchscreen_parse_properties()
84 	data_present |= touchscreen_get_prop_u32(dev, "touchscreen-size-x",  in touchscreen_parse_properties()
85 						 input_abs_get_max(input,  in touchscreen_parse_properties()
88 	data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x",  in touchscreen_parse_properties()
89 						 input_abs_get_fuzz(input, axis_x),  in touchscreen_parse_properties()
92 		touchscreen_set_params(input, axis_x, minimum, maximum - 1, fuzz);  in touchscreen_parse_properties()
94 	data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-y",  in touchscreen_parse_properties()
95 						input_abs_get_min(input, axis_y),  in touchscreen_parse_properties()
97 	data_present |= touchscreen_get_prop_u32(dev, "touchscreen-size-y",  in touchscreen_parse_properties()
98 						 input_abs_get_max(input,  in touchscreen_parse_properties()
101 	data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y",  in touchscreen_parse_properties()
102 						 input_abs_get_fuzz(input, axis_y),  in touchscreen_parse_properties()
105 		touchscreen_set_params(input, axis_y, minimum, maximum - 1, fuzz);  in touchscreen_parse_properties()
109 						"touchscreen-max-pressure",  in touchscreen_parse_properties()
110 						input_abs_get_max(input, axis),  in touchscreen_parse_properties()
113 						 "touchscreen-fuzz-pressure",  in touchscreen_parse_properties()
114 						 input_abs_get_fuzz(input, axis),  in touchscreen_parse_properties()
117 		touchscreen_set_params(input, axis, 0, maximum, fuzz);  in touchscreen_parse_properties()
122 	prop->max_x = input_abs_get_max(input, axis_x);  in touchscreen_parse_properties()
123 	prop->max_y = input_abs_get_max(input, axis_y);  in touchscreen_parse_properties()
125 	prop->invert_x =  in touchscreen_parse_properties()
126 		device_property_read_bool(dev, "touchscreen-inverted-x");  in touchscreen_parse_properties()
127 	if (prop->invert_x) {  in touchscreen_parse_properties()
128 		absinfo = &input->absinfo[axis_x];  in touchscreen_parse_properties()
129 		absinfo->maximum -= absinfo->minimum;  in touchscreen_parse_properties()
130 		absinfo->minimum = 0;  in touchscreen_parse_properties()
133 	prop->invert_y =  in touchscreen_parse_properties()
134 		device_property_read_bool(dev, "touchscreen-inverted-y");  in touchscreen_parse_properties()
135 	if (prop->invert_y) {  in touchscreen_parse_properties()
136 		absinfo = &input->absinfo[axis_y];  in touchscreen_parse_properties()
137 		absinfo->maximum -= absinfo->minimum;  in touchscreen_parse_properties()
138 		absinfo->minimum = 0;  in touchscreen_parse_properties()
141 	prop->swap_x_y =  in touchscreen_parse_properties()
142 		device_property_read_bool(dev, "touchscreen-swapped-x-y");  in touchscreen_parse_properties()
143 	if (prop->swap_x_y)  in touchscreen_parse_properties()
144 		swap(input->absinfo[axis_x], input->absinfo[axis_y]);  in touchscreen_parse_properties()
152 	if (prop->invert_x)  in touchscreen_apply_prop_to_x_y()
153 		*x = prop->max_x - *x;  in touchscreen_apply_prop_to_x_y()
155 	if (prop->invert_y)  in touchscreen_apply_prop_to_x_y()
156 		*y = prop->max_y - *y;  in touchscreen_apply_prop_to_x_y()
158 	if (prop->swap_x_y)  in touchscreen_apply_prop_to_x_y()
163  * touchscreen_set_mt_pos - Set input_mt_pos coordinates
178 	pos->x = x;  in touchscreen_set_mt_pos()
179 	pos->y = y;  in touchscreen_set_mt_pos()
184  * touchscreen_report_pos - Report touchscreen coordinates
185  * @input: input_device to report coordinates for
189  * @multitouch: Report coordinates on single-touch or multi-touch axes
195 void touchscreen_report_pos(struct input_dev *input,  in touchscreen_report_pos()  argument
201 	input_report_abs(input, multitouch ? ABS_MT_POSITION_X : ABS_X, x);  in touchscreen_report_pos()
202 	input_report_abs(input, multitouch ? ABS_MT_POSITION_Y : ABS_Y, y);  in touchscreen_report_pos()