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lij
2024-02-05 16:51:37 +08:00
commit 48911e3125
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MXC-A36/xrz/lv_drivers/indev/evdev.c Normal file
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/**
* @file evdev.c
*
*/
/*********************
* INCLUDES
*********************/
#include "evdev.h"
#if USE_EVDEV != 0 || USE_BSD_EVDEV
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#if USE_BSD_EVDEV
#include <dev/evdev/input.h>
#else
#include <linux/input.h>
#endif
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
int map(int x, int in_min, int in_max, int out_min, int out_max);
/**********************
* STATIC VARIABLES
**********************/
int evdev_fd;
int evdev_root_x;
int evdev_root_y;
int evdev_button;
int evdev_key_val;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Initialize the evdev interface
*/
void evdev_init(void)
{
#if USE_BSD_EVDEV
evdev_fd = open(EVDEV_NAME, O_RDWR | O_NOCTTY);
#else
evdev_fd = open(EVDEV_NAME, O_RDWR | O_NOCTTY | O_NDELAY);
#endif
if(evdev_fd == -1) {
perror("unable open evdev interface:");
return;
}
#if USE_BSD_EVDEV
fcntl(evdev_fd, F_SETFL, O_NONBLOCK);
#else
fcntl(evdev_fd, F_SETFL, O_ASYNC | O_NONBLOCK);
#endif
evdev_root_x = 0;
evdev_root_y = 0;
evdev_key_val = 0;
evdev_button = LV_INDEV_STATE_REL;
}
/**
* reconfigure the device file for evdev
* @param dev_name set the evdev device filename
* @return true: the device file set complete
* false: the device file doesn't exist current system
*/
bool evdev_set_file(char* dev_name)
{
if(evdev_fd != -1) {
close(evdev_fd);
}
#if USE_BSD_EVDEV
evdev_fd = open(dev_name, O_RDWR | O_NOCTTY);
#else
evdev_fd = open(dev_name, O_RDWR | O_NOCTTY | O_NDELAY);
#endif
if(evdev_fd == -1) {
perror("unable open evdev interface:");
return false;
}
#if USE_BSD_EVDEV
fcntl(evdev_fd, F_SETFL, O_NONBLOCK);
#else
fcntl(evdev_fd, F_SETFL, O_ASYNC | O_NONBLOCK);
#endif
evdev_root_x = 0;
evdev_root_y = 0;
evdev_key_val = 0;
evdev_button = LV_INDEV_STATE_REL;
return true;
}
/**
* Get the current position and state of the evdev
* @param data store the evdev data here
* @return false: because the points are not buffered, so no more data to be read
*/
bool evdev_read(lv_indev_drv_t * drv, lv_indev_data_t * data)
{
struct input_event in;
while(read(evdev_fd, &in, sizeof(struct input_event)) > 0) {
if(in.type == EV_REL) {
if(in.code == REL_X)
#if EVDEV_SWAP_AXES
evdev_root_y += in.value;
#else
evdev_root_x += in.value;
#endif
else if(in.code == REL_Y)
#if EVDEV_SWAP_AXES
evdev_root_x += in.value;
#else
evdev_root_y += in.value;
#endif
} else if(in.type == EV_ABS) {
if(in.code == ABS_X)
#if EVDEV_SWAP_AXES
evdev_root_y = in.value;
#else
evdev_root_x = in.value;
#endif
else if(in.code == ABS_Y)
#if EVDEV_SWAP_AXES
evdev_root_x = in.value;
#else
evdev_root_y = in.value;
#endif
else if(in.code == ABS_MT_POSITION_X)
#if EVDEV_SWAP_AXES
evdev_root_y = in.value;
#else
evdev_root_x = in.value;
#endif
else if(in.code == ABS_MT_POSITION_Y)
#if EVDEV_SWAP_AXES
evdev_root_x = in.value;
#else
evdev_root_y = in.value;
#endif
else if(in.code == ABS_MT_TRACKING_ID)
if(in.value == -1)
evdev_button = LV_INDEV_STATE_REL;
else if(in.value == 0)
evdev_button = LV_INDEV_STATE_PR;
} else if(in.type == EV_KEY) {
if(in.code == BTN_MOUSE || in.code == BTN_TOUCH) {
if(in.value == 0)
evdev_button = LV_INDEV_STATE_REL;
else if(in.value == 1)
evdev_button = LV_INDEV_STATE_PR;
} else if(drv->type == LV_INDEV_TYPE_KEYPAD) {
data->state = (in.value) ? LV_INDEV_STATE_PR : LV_INDEV_STATE_REL;
switch(in.code) {
case KEY_BACKSPACE:
data->key = LV_KEY_BACKSPACE;
break;
case KEY_ENTER:
data->key = LV_KEY_ENTER;
break;
case KEY_UP:
data->key = LV_KEY_UP;
break;
case KEY_LEFT:
data->key = LV_KEY_PREV;
break;
case KEY_RIGHT:
data->key = LV_KEY_NEXT;
break;
case KEY_DOWN:
data->key = LV_KEY_DOWN;
break;
default:
data->key = 0;
break;
}
evdev_key_val = data->key;
evdev_button = data->state;
return false;
}
}
}
if(drv->type == LV_INDEV_TYPE_KEYPAD) {
/* No data retrieved */
data->key = evdev_key_val;
data->state = evdev_button;
return false;
}
if(drv->type != LV_INDEV_TYPE_POINTER)
return false;
/*Store the collected data*/
#if EVDEV_CALIBRATE
data->point.x = map(evdev_root_x, EVDEV_HOR_MIN, EVDEV_HOR_MAX, 0, drv->disp->driver.hor_res);
data->point.y = map(evdev_root_y, EVDEV_VER_MIN, EVDEV_VER_MAX, 0, drv->disp->driver.ver_res);
#else
data->point.x = evdev_root_x;
data->point.y = evdev_root_y;
#endif
data->state = evdev_button;
if(data->point.x < 0)
data->point.x = 0;
if(data->point.y < 0)
data->point.y = 0;
if(data->point.x >= drv->disp->driver.hor_res)
data->point.x = drv->disp->driver.hor_res - 1;
if(data->point.y >= drv->disp->driver.ver_res)
data->point.y = drv->disp->driver.ver_res - 1;
return false;
}
/**********************
* STATIC FUNCTIONS
**********************/
int map(int x, int in_min, int in_max, int out_min, int out_max)
{
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
#endif