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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209// SPDX-License-Identifier: GPL-2.0-only/* * Generic helper functions for touchscreens and other two-dimensional * pointing devices * * Copyright (c) 2014 Sebastian Reichel <sre@kernel.org> */
#include <linux/export.h>#include <linux/property.h>#include <linux/input.h>#include <linux/input/mt.h>#include <linux/input/touchscreen.h>#include <linux/module.h>
static bool touchscreen_get_prop_u32(struct device *dev, const char *property, unsigned int default_value, unsigned int *value){ u32 val; int error;
error = device_property_read_u32(dev, property, &val); if (error) { *value = default_value; return false; }
*value = val; return true;}
static void touchscreen_set_params(struct input_dev *dev, unsigned long axis, int min, int max, int fuzz){ struct input_absinfo *absinfo;
if (!test_bit(axis, dev->absbit)) { dev_warn(&dev->dev, "Parameters are specified but the axis %lu is not set up\n", axis); return; }
absinfo = &dev->absinfo[axis]; absinfo->minimum = min; absinfo->maximum = max; absinfo->fuzz = fuzz;}
/** * touchscreen_parse_properties - parse common touchscreen properties * @input: input device that should be parsed * @multitouch: specifies whether parsed properties should be applied to * single-touch or multi-touch axes * @prop: pointer to a struct touchscreen_properties into which to store * axis swap and invert info for use with touchscreen_report_x_y(); * or %NULL * * This function parses common properties for touchscreens and sets up the * input device accordingly. The function keeps previously set up default * values if no value is specified. */void touchscreen_parse_properties(struct input_dev *input, bool multitouch, struct touchscreen_properties *prop){ struct device *dev = input->dev.parent; struct input_absinfo *absinfo; unsigned int axis, axis_x, axis_y; unsigned int minimum, maximum, fuzz; bool data_present;
input_alloc_absinfo(input); if (!input->absinfo) return;
axis_x = multitouch ? ABS_MT_POSITION_X : ABS_X; axis_y = multitouch ? ABS_MT_POSITION_Y : ABS_Y;
data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-x", input_abs_get_min(input, axis_x), &minimum); data_present |= touchscreen_get_prop_u32(dev, "touchscreen-size-x", input_abs_get_max(input, axis_x) + 1, &maximum); data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x", input_abs_get_fuzz(input, axis_x), &fuzz); if (data_present) touchscreen_set_params(input, axis_x, minimum, maximum - 1, fuzz);
data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-y", input_abs_get_min(input, axis_y), &minimum); data_present |= touchscreen_get_prop_u32(dev, "touchscreen-size-y", input_abs_get_max(input, axis_y) + 1, &maximum); data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y", input_abs_get_fuzz(input, axis_y), &fuzz); if (data_present) touchscreen_set_params(input, axis_y, minimum, maximum - 1, fuzz);
axis = multitouch ? ABS_MT_PRESSURE : ABS_PRESSURE; data_present = touchscreen_get_prop_u32(dev, "touchscreen-max-pressure", input_abs_get_max(input, axis), &maximum); data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-pressure", input_abs_get_fuzz(input, axis), &fuzz); if (data_present) touchscreen_set_params(input, axis, 0, maximum, fuzz);
if (!prop) return;
prop->max_x = input_abs_get_max(input, axis_x); prop->max_y = input_abs_get_max(input, axis_y);
prop->invert_x = device_property_read_bool(dev, "touchscreen-inverted-x"); if (prop->invert_x) { absinfo = &input->absinfo[axis_x]; absinfo->maximum -= absinfo->minimum; absinfo->minimum = 0; }
prop->invert_y = device_property_read_bool(dev, "touchscreen-inverted-y"); if (prop->invert_y) { absinfo = &input->absinfo[axis_y]; absinfo->maximum -= absinfo->minimum; absinfo->minimum = 0; }
prop->swap_x_y = device_property_read_bool(dev, "touchscreen-swapped-x-y"); if (prop->swap_x_y) swap(input->absinfo[axis_x], input->absinfo[axis_y]);}EXPORT_SYMBOL(touchscreen_parse_properties);
static voidtouchscreen_apply_prop_to_x_y(const struct touchscreen_properties *prop, unsigned int *x, unsigned int *y){ if (prop->invert_x) *x = prop->max_x - *x;
if (prop->invert_y) *y = prop->max_y - *y;
if (prop->swap_x_y) swap(*x, *y);}
/** * touchscreen_set_mt_pos - Set input_mt_pos coordinates * @pos: input_mt_pos to set coordinates of * @prop: pointer to a struct touchscreen_properties * @x: X coordinate to store in pos * @y: Y coordinate to store in pos * * Adjust the passed in x and y values applying any axis inversion and * swapping requested in the passed in touchscreen_properties and store * the result in a struct input_mt_pos. */void touchscreen_set_mt_pos(struct input_mt_pos *pos, const struct touchscreen_properties *prop, unsigned int x, unsigned int y){ touchscreen_apply_prop_to_x_y(prop, &x, &y); pos->x = x; pos->y = y;}EXPORT_SYMBOL(touchscreen_set_mt_pos);
/** * touchscreen_report_pos - Report touchscreen coordinates * @input: input_device to report coordinates for * @prop: pointer to a struct touchscreen_properties * @x: X coordinate to report * @y: Y coordinate to report * @multitouch: Report coordinates on single-touch or multi-touch axes * * Adjust the passed in x and y values applying any axis inversion and * swapping requested in the passed in touchscreen_properties and then * report the resulting coordinates on the input_dev's x and y axis. */void touchscreen_report_pos(struct input_dev *input, const struct touchscreen_properties *prop, unsigned int x, unsigned int y, bool multitouch){ touchscreen_apply_prop_to_x_y(prop, &x, &y); input_report_abs(input, multitouch ? ABS_MT_POSITION_X : ABS_X, x); input_report_abs(input, multitouch ? ABS_MT_POSITION_Y : ABS_Y, y);}EXPORT_SYMBOL(touchscreen_report_pos);
MODULE_LICENSE("GPL v2");MODULE_DESCRIPTION("Helper functions for touchscreens and other devices");