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