/*********************************************************************************
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* Copyright: (C) 2024 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: key.c
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* Description: This file is linux GPIO button driver test code.
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*
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********************************************************************************/
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <libgen.h>
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#include <getopt.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <linux/input.h>
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#include <linux/kd.h>
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#include <linux/keyboard.h>
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#if 0 /* Just for comment here, Reference to linux-3.3/include/linux/input.h */
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struct input_event
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{
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struct timeval time;
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__u16 type; /* 0x00:EV_SYN 0x01:EV_KEY 0x04:EV_MSC 0x11:EV_LED*/
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__u16 code; /* key value, which key */
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__s32 value; /* 1: Pressed 0:Not pressed 2:Always Pressed */
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};
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#endif
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#define EV_RELEASED 0
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#define EV_PRESSED 1
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#define EV_REPEAT 2
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#define BUTTON_CNT 1
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#define MODE_POLL 0x01
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#define MODE_NORMAL 0x02
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void usage(char *name);
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void display_button_event(struct input_event *ev, int cnt);
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static void program_usage(const char *progname)
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{
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printf("Usage: %s [OPTION]...\n", progname);
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printf(" This is linux GPIO button driver test program.\n");
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printf(" -d[device ] Specify input device number, such as 0\n");
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printf(" -h[help ] Display this help information\n");
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printf("\n");
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printf("%s program Version v1.0.0\n", progname);
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printf("Copyright (C) 2023 LingYun IoT System Studio.\n");
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return;
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}
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int main(int argc, char **argv)
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{
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char *progname=NULL;
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char kbd_dev[128];
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char kbd_name[128] = "Unknown";
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int kbd_fd = -1;
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struct input_event ev[BUTTON_CNT];
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int size = sizeof (struct input_event);
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int which = -1;
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int rv, opt;
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fd_set rds;
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struct option long_options[] = {
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{"device", required_argument, NULL, 'd'},
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{"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, 0}
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};
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progname = basename(argv[0]);
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/* Parser the command line parameters */
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while ((rv = getopt_long(argc, argv, "d:h", long_options, NULL)) != -1)
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{
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switch (rv)
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{
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case 'd': /* Set infrared number, such as 0...max */
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which = atoi(optarg);
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break;
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case 'h': /* Get help information */
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program_usage(progname);
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return 0;
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default:
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break;
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}
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}
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if( !which )
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{
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program_usage(progname);
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return 1;
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}
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if ((getuid ()) != 0)
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printf ("You are not root! This may not work...\n");
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snprintf(kbd_dev, sizeof(kbd_dev), "/dev/input/event%d", which);
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if ((kbd_fd = open(kbd_dev, O_RDONLY)) < 0)
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{
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printf("Open %s failure: %s", kbd_dev, strerror(errno));
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return -1;
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}
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ioctl (kbd_fd, EVIOCGNAME (sizeof (kbd_name)), kbd_name);
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printf ("Monitor input device %s (%s) event on poll mode:\n", kbd_dev, kbd_name);
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while (1)
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{
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FD_ZERO(&rds);
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FD_SET(kbd_fd, &rds);
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rv = select(kbd_fd + 1, &rds, NULL, NULL, NULL);
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if (rv < 0)
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{
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printf("select() system call failure: %s\n", strerror(errno));
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goto cleanup;
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}
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else if (FD_ISSET(kbd_fd, &rds))
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{
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if ((rv=read(kbd_fd, ev, size*BUTTON_CNT )) < size)
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{
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printf("Reading data from kbd_fd failure: %s\n", strerror(errno));
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break;
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}
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else
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{
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display_button_event(ev, rv/size);
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}
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}
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}
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cleanup:
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close(kbd_fd);
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return 0;
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}
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void display_button_event(struct input_event *ev, int cnt)
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{
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int i;
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struct timeval pressed_time, duration_time;
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for(i=0; i<cnt; i++)
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{
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//printf("type:%d code:%d value:%d\n", ev[i].type, ev[i].code, ev[i].value);
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if(EV_KEY==ev[i].type && EV_PRESSED==ev[i].value)
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{
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pressed_time = ev[i].time;
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printf("Keypad[%d] pressed time: %ld.%ld\n", ev[i].code, pressed_time.tv_sec, pressed_time.tv_usec);
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}
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if(EV_KEY==ev[i].type && EV_RELEASED==ev[i].value)
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{
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timersub(&ev[i].time, &pressed_time, &duration_time);
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printf("keypad[%d] duration time: %ld.%ld\n", ev[i].code, duration_time.tv_sec, duration_time.tv_usec);
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}
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}
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}
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