xref: /OK3568_Linux_fs/app/lvgl_demo/hal/key.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /**
2*4882a593Smuzhiyun  * @file evdev.c
3*4882a593Smuzhiyun  *
4*4882a593Smuzhiyun  */
5*4882a593Smuzhiyun 
6*4882a593Smuzhiyun /*********************
7*4882a593Smuzhiyun  *      INCLUDES
8*4882a593Smuzhiyun  *********************/
9*4882a593Smuzhiyun #include "key.h"
10*4882a593Smuzhiyun #if USE_KEY != 0
11*4882a593Smuzhiyun 
12*4882a593Smuzhiyun #include <stdio.h>
13*4882a593Smuzhiyun #include <unistd.h>
14*4882a593Smuzhiyun #include <fcntl.h>
15*4882a593Smuzhiyun #include <linux/input.h>
16*4882a593Smuzhiyun 
17*4882a593Smuzhiyun /*********************
18*4882a593Smuzhiyun  *      DEFINES
19*4882a593Smuzhiyun  *********************/
20*4882a593Smuzhiyun 
21*4882a593Smuzhiyun /**********************
22*4882a593Smuzhiyun  *      TYPEDEFS
23*4882a593Smuzhiyun  **********************/
24*4882a593Smuzhiyun 
25*4882a593Smuzhiyun /**********************
26*4882a593Smuzhiyun  *  STATIC PROTOTYPES
27*4882a593Smuzhiyun  **********************/
28*4882a593Smuzhiyun 
29*4882a593Smuzhiyun /**********************
30*4882a593Smuzhiyun  *  STATIC VARIABLES
31*4882a593Smuzhiyun  **********************/
32*4882a593Smuzhiyun static int key_fd;
33*4882a593Smuzhiyun static int key_button;
34*4882a593Smuzhiyun 
35*4882a593Smuzhiyun static int key_val;
36*4882a593Smuzhiyun /**********************
37*4882a593Smuzhiyun  *      MACROS
38*4882a593Smuzhiyun  **********************/
39*4882a593Smuzhiyun 
40*4882a593Smuzhiyun /**********************
41*4882a593Smuzhiyun  *   GLOBAL FUNCTIONS
42*4882a593Smuzhiyun  **********************/
43*4882a593Smuzhiyun 
44*4882a593Smuzhiyun /**
45*4882a593Smuzhiyun  * Initialize the evdev interface
46*4882a593Smuzhiyun  */
key_init(void)47*4882a593Smuzhiyun void key_init(void)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun     key_fd = open(KEY_NAME, O_RDWR | O_NOCTTY | O_NDELAY);
50*4882a593Smuzhiyun 
51*4882a593Smuzhiyun     if(key_fd == -1) {
52*4882a593Smuzhiyun         perror("unable open evdev interface:");
53*4882a593Smuzhiyun         return;
54*4882a593Smuzhiyun     }
55*4882a593Smuzhiyun 
56*4882a593Smuzhiyun     fcntl(key_fd, F_SETFL, O_ASYNC | O_NONBLOCK);
57*4882a593Smuzhiyun 
58*4882a593Smuzhiyun     key_val = 0;
59*4882a593Smuzhiyun     key_button = LV_INDEV_STATE_REL;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun 
62*4882a593Smuzhiyun /**
63*4882a593Smuzhiyun  * Get the current position and state of the evdev
64*4882a593Smuzhiyun  * @param data store the evdev data here
65*4882a593Smuzhiyun  * @return false: because the points are not buffered, so no more data to be read
66*4882a593Smuzhiyun  */
key_read(lv_indev_drv_t * drv,lv_indev_data_t * data)67*4882a593Smuzhiyun void key_read(lv_indev_drv_t * drv, lv_indev_data_t * data)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun     struct input_event in;
70*4882a593Smuzhiyun 
71*4882a593Smuzhiyun     while(read(key_fd, &in, sizeof(struct input_event)) > 0) {
72*4882a593Smuzhiyun         if(in.type == EV_KEY) {
73*4882a593Smuzhiyun             data->state = (in.value) ? LV_INDEV_STATE_PR : LV_INDEV_STATE_REL;
74*4882a593Smuzhiyun             switch(in.code) {
75*4882a593Smuzhiyun             case 1:
76*4882a593Smuzhiyun                 data->key = LV_KEY_ESC;
77*4882a593Smuzhiyun                 break;
78*4882a593Smuzhiyun             case 139:
79*4882a593Smuzhiyun                 data->key = LV_KEY_ENTER;
80*4882a593Smuzhiyun                 break;
81*4882a593Smuzhiyun             //case KEY_UP:
82*4882a593Smuzhiyun             //    data->key = LV_KEY_UP;
83*4882a593Smuzhiyun             //    break;
84*4882a593Smuzhiyun             case 105:
85*4882a593Smuzhiyun                 data->key = LV_KEY_PREV;
86*4882a593Smuzhiyun                 break;
87*4882a593Smuzhiyun             case 106:
88*4882a593Smuzhiyun                 data->key = LV_KEY_NEXT;
89*4882a593Smuzhiyun                 break;
90*4882a593Smuzhiyun             //case KEY_DOWN:
91*4882a593Smuzhiyun             //    data->key = LV_KEY_DOWN;
92*4882a593Smuzhiyun             //    break;
93*4882a593Smuzhiyun             default:
94*4882a593Smuzhiyun                 data->key = 0;
95*4882a593Smuzhiyun                 break;
96*4882a593Smuzhiyun             }
97*4882a593Smuzhiyun             key_val = data->key;
98*4882a593Smuzhiyun             key_button = data->state;
99*4882a593Smuzhiyun             return ;
100*4882a593Smuzhiyun         }
101*4882a593Smuzhiyun     }
102*4882a593Smuzhiyun 
103*4882a593Smuzhiyun     if(drv->type == LV_INDEV_TYPE_KEYPAD) {
104*4882a593Smuzhiyun         /* No data retrieved */
105*4882a593Smuzhiyun         data->key = key_val;
106*4882a593Smuzhiyun         data->state = key_button;
107*4882a593Smuzhiyun         return ;
108*4882a593Smuzhiyun     }
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun #endif
111