embox

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/**
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 * @file
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 * @brief LVGL input devices interface port
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 *
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 * @date 15.02.2021
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 * @author Alexander Kalmuk
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 */
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <util/log.h>
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#include <drivers/input/input_dev.h>
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#include "lvgl.h"
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static bool left_button_down = false;
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static int16_t last_x = 0, last_y = 0;
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static int inp_fd;
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#if LVGL_VERSION_MAJOR == 7
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bool lvgl_port_input_dev_read(lv_indev_drv_t *indev_drv, lv_indev_data_t *data) {
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#else
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void lvgl_port_input_dev_read(lv_indev_drv_t *indev_drv, lv_indev_data_t *data) {
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#endif
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	(void) indev_drv;      /*Unused*/
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	/*Store the collected data*/
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	data->point.x = last_x;
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	data->point.y = last_y;
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	data->state = left_button_down ? LV_INDEV_STATE_PR : LV_INDEV_STATE_REL;
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#if LVGL_VERSION_MAJOR == 7
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	return false;
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#endif
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}
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int lvgl_port_input_dev_init(const char *path) {
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	inp_fd = open(path, O_RDONLY | O_NONBLOCK);
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	if (inp_fd == -1) {
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		log_error("Cannot find mouse \"%s\"", path);
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		return -1;
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	}
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	return 0;
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}
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static int normalize_coord(int x, int a, int b) {
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	if (x < a) {
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		return a;
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	} else if (x > b - 1) {
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		return b - 1;
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	} else {
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		return x;
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	}
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}
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void lvgl_port_mouse_handle(void) {
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	struct input_event ev;
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	while (1) {
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		if (read(inp_fd, &ev, sizeof ev) <= 0) {
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			break;
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		}
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		last_x += (ev.value >> 16) & 0xffff;
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		last_y -= ev.value & 0xffff;
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		last_x = normalize_coord(last_x, 0, LV_HOR_RES_MAX);
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		last_y = normalize_coord(last_y, 0, LV_VER_RES_MAX);
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		left_button_down = !!(ev.type & MOUSE_BUTTON_LEFT);
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	}
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}
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void lvgl_port_touchscreen_handle(void) {
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	struct input_event ev;
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	while (1) {
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		if (read(inp_fd, &ev, sizeof ev) <= 0) {
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			break;
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		}
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		switch (ev.type & ~TS_EVENT_NEXT) {
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		case TS_TOUCH_1:
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			last_x = (int16_t) ((ev.value >> 16) & 0xffff);
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			last_y = (int16_t) ev.value & 0xffff;
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			last_x = normalize_coord(last_x, 0, LV_HOR_RES_MAX);
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			last_y = normalize_coord(last_y, 0, LV_VER_RES_MAX);
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			left_button_down = true;
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			break;
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		case TS_TOUCH_1_RELEASED:
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			left_button_down = false;
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			break;
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		default:
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			continue;
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		}
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	}
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}
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