Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic DT helper functions for touchscreen devices |
| 3 | * |
| 4 | * Copyright (c) 2014 Sebastian Reichel <sre@kernel.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | */ |
| 11 | |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 12 | #include <linux/property.h> |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 13 | #include <linux/input.h> |
Maxime Ripard | 0a363a3 | 2015-03-21 20:17:57 -0700 | [diff] [blame] | 14 | #include <linux/input/mt.h> |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 15 | #include <linux/input/touchscreen.h> |
| 16 | |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 17 | static bool touchscreen_get_prop_u32(struct device *dev, |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 18 | const char *property, |
| 19 | unsigned int default_value, |
| 20 | unsigned int *value) |
Maxime Ripard | 3eea8b5 | 2015-03-21 20:17:48 -0700 | [diff] [blame] | 21 | { |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 22 | u32 val; |
| 23 | int error; |
Maxime Ripard | 3eea8b5 | 2015-03-21 20:17:48 -0700 | [diff] [blame] | 24 | |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 25 | error = device_property_read_u32(dev, property, &val); |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 26 | if (error) { |
| 27 | *value = default_value; |
| 28 | return false; |
| 29 | } |
Maxime Ripard | 3eea8b5 | 2015-03-21 20:17:48 -0700 | [diff] [blame] | 30 | |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 31 | *value = val; |
| 32 | return true; |
Maxime Ripard | 3eea8b5 | 2015-03-21 20:17:48 -0700 | [diff] [blame] | 33 | } |
| 34 | |
| 35 | static void touchscreen_set_params(struct input_dev *dev, |
| 36 | unsigned long axis, |
| 37 | int max, int fuzz) |
| 38 | { |
| 39 | struct input_absinfo *absinfo; |
| 40 | |
| 41 | if (!test_bit(axis, dev->absbit)) { |
Dmitry Torokhov | f61fd21 | 2015-07-06 14:45:25 -0700 | [diff] [blame] | 42 | dev_warn(&dev->dev, |
| 43 | "DT specifies parameters but the axis %lu is not set up\n", |
| 44 | axis); |
Maxime Ripard | 3eea8b5 | 2015-03-21 20:17:48 -0700 | [diff] [blame] | 45 | return; |
| 46 | } |
| 47 | |
| 48 | absinfo = &dev->absinfo[axis]; |
| 49 | absinfo->maximum = max; |
| 50 | absinfo->fuzz = fuzz; |
| 51 | } |
| 52 | |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 53 | /** |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 54 | * touchscreen_parse_properties - parse common touchscreen DT properties |
| 55 | * @input: input device that should be parsed |
| 56 | * @multitouch: specifies whether parsed properties should be applied to |
| 57 | * single-touch or multi-touch axes |
Hans de Goede | ed7c987 | 2016-07-15 14:05:29 -0700 | [diff] [blame] | 58 | * @prop: pointer to a struct touchscreen_properties into which to store |
| 59 | * axis swap and invert info for use with touchscreen_report_x_y(); |
| 60 | * or %NULL |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 61 | * |
| 62 | * This function parses common DT properties for touchscreens and setups the |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 63 | * input device accordingly. The function keeps previously set up default |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 64 | * values if no value is specified via DT. |
| 65 | */ |
Hans de Goede | ed7c987 | 2016-07-15 14:05:29 -0700 | [diff] [blame] | 66 | void touchscreen_parse_properties(struct input_dev *input, bool multitouch, |
| 67 | struct touchscreen_properties *prop) |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 68 | { |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 69 | struct device *dev = input->dev.parent; |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 70 | unsigned int axis; |
| 71 | unsigned int maximum, fuzz; |
| 72 | bool data_present; |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 73 | |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 74 | input_alloc_absinfo(input); |
| 75 | if (!input->absinfo) |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 76 | return; |
| 77 | |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 78 | axis = multitouch ? ABS_MT_POSITION_X : ABS_X; |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 79 | data_present = touchscreen_get_prop_u32(dev, "touchscreen-size-x", |
| 80 | input_abs_get_max(input, |
Dmitry Torokhov | 5171786 | 2015-07-06 14:57:54 -0700 | [diff] [blame] | 81 | axis) + 1, |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 82 | &maximum) | |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 83 | touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x", |
| 84 | input_abs_get_fuzz(input, axis), |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 85 | &fuzz); |
| 86 | if (data_present) |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 87 | touchscreen_set_params(input, axis, maximum - 1, fuzz); |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 88 | |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 89 | axis = multitouch ? ABS_MT_POSITION_Y : ABS_Y; |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 90 | data_present = touchscreen_get_prop_u32(dev, "touchscreen-size-y", |
| 91 | input_abs_get_max(input, |
Dmitry Torokhov | 5171786 | 2015-07-06 14:57:54 -0700 | [diff] [blame] | 92 | axis) + 1, |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 93 | &maximum) | |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 94 | touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y", |
| 95 | input_abs_get_fuzz(input, axis), |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 96 | &fuzz); |
| 97 | if (data_present) |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 98 | touchscreen_set_params(input, axis, maximum - 1, fuzz); |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 99 | |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 100 | axis = multitouch ? ABS_MT_PRESSURE : ABS_PRESSURE; |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 101 | data_present = touchscreen_get_prop_u32(dev, |
| 102 | "touchscreen-max-pressure", |
| 103 | input_abs_get_max(input, axis), |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 104 | &maximum) | |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 105 | touchscreen_get_prop_u32(dev, |
| 106 | "touchscreen-fuzz-pressure", |
| 107 | input_abs_get_fuzz(input, axis), |
Dmitry Torokhov | 7c49437 | 2015-06-01 10:35:16 -0700 | [diff] [blame] | 108 | &fuzz); |
| 109 | if (data_present) |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 110 | touchscreen_set_params(input, axis, maximum, fuzz); |
Hans de Goede | ed7c987 | 2016-07-15 14:05:29 -0700 | [diff] [blame] | 111 | |
| 112 | if (!prop) |
| 113 | return; |
| 114 | |
| 115 | axis = multitouch ? ABS_MT_POSITION_X : ABS_X; |
| 116 | |
| 117 | prop->max_x = input_abs_get_max(input, axis); |
| 118 | prop->max_y = input_abs_get_max(input, axis + 1); |
| 119 | prop->invert_x = |
| 120 | device_property_read_bool(dev, "touchscreen-inverted-x"); |
| 121 | prop->invert_y = |
| 122 | device_property_read_bool(dev, "touchscreen-inverted-y"); |
| 123 | prop->swap_x_y = |
| 124 | device_property_read_bool(dev, "touchscreen-swapped-x-y"); |
| 125 | |
| 126 | if (prop->swap_x_y) |
| 127 | swap(input->absinfo[axis], input->absinfo[axis + 1]); |
Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 128 | } |
Dmitry Torokhov | 4200e83 | 2015-07-06 15:18:24 -0700 | [diff] [blame] | 129 | EXPORT_SYMBOL(touchscreen_parse_properties); |
Hans de Goede | ed7c987 | 2016-07-15 14:05:29 -0700 | [diff] [blame] | 130 | |
| 131 | static void |
| 132 | touchscreen_apply_prop_to_x_y(const struct touchscreen_properties *prop, |
| 133 | unsigned int *x, unsigned int *y) |
| 134 | { |
| 135 | if (prop->invert_x) |
| 136 | *x = prop->max_x - *x; |
| 137 | |
| 138 | if (prop->invert_y) |
| 139 | *y = prop->max_y - *y; |
| 140 | |
| 141 | if (prop->swap_x_y) |
| 142 | swap(*x, *y); |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * touchscreen_set_mt_pos - Set input_mt_pos coordinates |
| 147 | * @pos: input_mt_pos to set coordinates of |
| 148 | * @prop: pointer to a struct touchscreen_properties |
| 149 | * @x: X coordinate to store in pos |
| 150 | * @y: Y coordinate to store in pos |
| 151 | * |
| 152 | * Adjust the passed in x and y values applying any axis inversion and |
| 153 | * swapping requested in the passed in touchscreen_properties and store |
| 154 | * the result in a struct input_mt_pos. |
| 155 | */ |
| 156 | void touchscreen_set_mt_pos(struct input_mt_pos *pos, |
| 157 | const struct touchscreen_properties *prop, |
| 158 | unsigned int x, unsigned int y) |
| 159 | { |
| 160 | touchscreen_apply_prop_to_x_y(prop, &x, &y); |
| 161 | pos->x = x; |
| 162 | pos->y = y; |
| 163 | } |
| 164 | EXPORT_SYMBOL(touchscreen_set_mt_pos); |
| 165 | |
| 166 | /** |
| 167 | * touchscreen_report_pos - Report touchscreen coordinates |
| 168 | * @input: input_device to report coordinates for |
| 169 | * @prop: pointer to a struct touchscreen_properties |
| 170 | * @x: X coordinate to report |
| 171 | * @y: Y coordinate to report |
| 172 | * @multitouch: Report coordinates on single-touch or multi-touch axes |
| 173 | * |
| 174 | * Adjust the passed in x and y values applying any axis inversion and |
| 175 | * swapping requested in the passed in touchscreen_properties and then |
| 176 | * report the resulting coordinates on the input_dev's x and y axis. |
| 177 | */ |
| 178 | void touchscreen_report_pos(struct input_dev *input, |
| 179 | const struct touchscreen_properties *prop, |
| 180 | unsigned int x, unsigned int y, |
| 181 | bool multitouch) |
| 182 | { |
| 183 | touchscreen_apply_prop_to_x_y(prop, &x, &y); |
| 184 | input_report_abs(input, multitouch ? ABS_MT_POSITION_X : ABS_X, x); |
| 185 | input_report_abs(input, multitouch ? ABS_MT_POSITION_Y : ABS_Y, y); |
| 186 | } |
| 187 | EXPORT_SYMBOL(touchscreen_report_pos); |