118 lines
2.4 KiB
C
118 lines
2.4 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 "key.h"
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#if USE_KEY != 0
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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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#include <linux/input.h>
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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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/**********************
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* STATIC VARIABLES
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**********************/
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static int key_fd;
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static int key_button;
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static int 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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int key_init(void)
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{
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key_fd = open(KEY_NAME, O_RDWR | O_NOCTTY | O_NDELAY);
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if (key_fd == -1)
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{
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perror("unable open evdev interface:");
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return -1;
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}
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fcntl(key_fd, F_SETFL, O_ASYNC | O_NONBLOCK);
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key_val = 0;
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key_button = LV_INDEV_STATE_REL;
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return 0;
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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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void key_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(key_fd, &in, sizeof(struct input_event)) > 0)
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{
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if (in.type == EV_KEY)
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{
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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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{
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case 1:
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data->key = LV_KEY_ESC;
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break;
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case 139:
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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 105:
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data->key = LV_KEY_PREV;
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break;
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case 106:
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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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key_val = data->key;
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key_button = data->state;
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return ;
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}
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}
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if (drv->type == LV_INDEV_TYPE_KEYPAD)
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{
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/* No data retrieved */
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data->key = key_val;
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data->state = key_button;
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return ;
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}
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}
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#endif
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