1 // SPDX-License-Identifier: GPL-2.0-only
3  *  Generic DT helper functions for touchscreen devices
11 #include <linux/input/touchscreen.h>
34 				   int min, int max, int fuzz)  in touchscreen_set_params()  argument
38 	if (!test_bit(axis, dev->absbit)) {  in touchscreen_set_params()
39 		dev_warn(&dev->dev,  in touchscreen_set_params()
45 	absinfo = &dev->absinfo[axis];  in touchscreen_set_params()
46 	absinfo->minimum = min;  in touchscreen_set_params()
47 	absinfo->maximum = max;  in touchscreen_set_params()
48 	absinfo->fuzz = fuzz;  in touchscreen_set_params()
52  * touchscreen_parse_properties - parse common touchscreen DT properties
55  *	single-touch or multi-touch axes
67 	struct device *dev = input->dev.parent;  in touchscreen_parse_properties()
70 	unsigned int minimum, maximum, fuzz;  in touchscreen_parse_properties()  local
74 	if (!input->absinfo)  in touchscreen_parse_properties()
80 	data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-x",  in touchscreen_parse_properties()
83 		       touchscreen_get_prop_u32(dev, "touchscreen-size-x",  in touchscreen_parse_properties()
87 		       touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x",  in touchscreen_parse_properties()
89 						&fuzz);  in touchscreen_parse_properties()
91 		touchscreen_set_params(input, axis_x, minimum, maximum - 1, fuzz);  in touchscreen_parse_properties()
93 	data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-y",  in touchscreen_parse_properties()
96 		       touchscreen_get_prop_u32(dev, "touchscreen-size-y",  in touchscreen_parse_properties()
100 		       touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y",  in touchscreen_parse_properties()
102 						&fuzz);  in touchscreen_parse_properties()
104 		touchscreen_set_params(input, axis_y, minimum, maximum - 1, fuzz);  in touchscreen_parse_properties()
108 						"touchscreen-max-pressure",  in touchscreen_parse_properties()
112 						"touchscreen-fuzz-pressure",  in touchscreen_parse_properties()
114 						&fuzz);  in touchscreen_parse_properties()
116 		touchscreen_set_params(input, axis, 0, maximum, fuzz);  in touchscreen_parse_properties()
121 	prop->max_x = input_abs_get_max(input, axis_x);  in touchscreen_parse_properties()
122 	prop->max_y = input_abs_get_max(input, axis_y);  in touchscreen_parse_properties()
124 	prop->invert_x =  in touchscreen_parse_properties()
125 		device_property_read_bool(dev, "touchscreen-inverted-x");  in touchscreen_parse_properties()
126 	if (prop->invert_x) {  in touchscreen_parse_properties()
127 		absinfo = &input->absinfo[axis_x];  in touchscreen_parse_properties()
128 		absinfo->maximum -= absinfo->minimum;  in touchscreen_parse_properties()
129 		absinfo->minimum = 0;  in touchscreen_parse_properties()
132 	prop->invert_y =  in touchscreen_parse_properties()
133 		device_property_read_bool(dev, "touchscreen-inverted-y");  in touchscreen_parse_properties()
134 	if (prop->invert_y) {  in touchscreen_parse_properties()
135 		absinfo = &input->absinfo[axis_y];  in touchscreen_parse_properties()
136 		absinfo->maximum -= absinfo->minimum;  in touchscreen_parse_properties()
137 		absinfo->minimum = 0;  in touchscreen_parse_properties()
140 	prop->swap_x_y =  in touchscreen_parse_properties()
141 		device_property_read_bool(dev, "touchscreen-swapped-x-y");  in touchscreen_parse_properties()
142 	if (prop->swap_x_y)  in touchscreen_parse_properties()
143 		swap(input->absinfo[axis_x], input->absinfo[axis_y]);  in touchscreen_parse_properties()
151 	if (prop->invert_x)  in touchscreen_apply_prop_to_x_y()
152 		*x = prop->max_x - *x;  in touchscreen_apply_prop_to_x_y()
154 	if (prop->invert_y)  in touchscreen_apply_prop_to_x_y()
155 		*y = prop->max_y - *y;  in touchscreen_apply_prop_to_x_y()
157 	if (prop->swap_x_y)  in touchscreen_apply_prop_to_x_y()
162  * touchscreen_set_mt_pos - Set input_mt_pos coordinates
177 	pos->x = x;  in touchscreen_set_mt_pos()
178 	pos->y = y;  in touchscreen_set_mt_pos()
183  * touchscreen_report_pos - Report touchscreen coordinates
188  * @multitouch: Report coordinates on single-touch or multi-touch axes
206 MODULE_DESCRIPTION("Device-tree helpers functions for touchscreen devices");