touch_dev.h

/*
 * Copyright (C) 2020 Inria
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
 
#define TOUCH_DEV_VALUE_INVALID         ((touch_t){ UINT16_MAX, UINT16_MAX })
 
typedef struct touch_dev touch_dev_t;
 
typedef struct {
    uint16_t x;     
    uint16_t y;     
} touch_t;
 
typedef void (*touch_event_cb_t)(void *arg);
 
typedef struct {
 
    uint16_t (*height)(const touch_dev_t *dev);
 
    uint16_t (*width)(const touch_dev_t *dev);
 
    uint8_t (*max_numof)(const touch_dev_t *dev);
 
    uint8_t (*touches)(const touch_dev_t *dev, touch_t *touches, size_t len);
 
    void (*set_event_callback)(const touch_dev_t *dev, touch_event_cb_t cb, void *arg);
} touch_dev_driver_t;
 
struct touch_dev {
    const touch_dev_driver_t *driver;    
};
 
typedef struct touch_dev_reg {
    struct touch_dev_reg *next;     
    touch_dev_t *dev;               
    uint8_t screen_id;              
} touch_dev_reg_t;
 
extern touch_dev_reg_t *touch_dev_reg;
 
int touch_dev_reg_add(touch_dev_reg_t *dev);
 
touch_dev_reg_t *touch_dev_reg_find_screen(uint8_t screen_id);
 
uint16_t touch_dev_height(const touch_dev_t *dev);
 
uint16_t touch_dev_width(const touch_dev_t *dev);
 
static inline uint8_t touch_dev_max_numof(const touch_dev_t *dev)
{
    assert(dev);
    return (dev->driver->max_numof) ? dev->driver->max_numof(dev) : 1;
}
 
uint8_t touch_dev_touches(const touch_dev_t *dev, touch_t *touches, size_t len);
 
void touch_dev_set_touch_event_callback(const touch_dev_t *dev, touch_event_cb_t cb, void *arg);
 
#ifdef __cplusplus
}
#endif