1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <stdint.h>
5 #include <fcntl.h>
6 #include <sys/ioctl.h>
7 //#include <linux/input.h> // this does not compile
8 #include <errno.h>
9
10
11 // from <linux/input.h>
12
13 struct input_event {
14 struct timeval time;
15 __u16 type;
16 __u16 code;
17 __s32 value;
18 };
19
20 #define EVIOCGVERSION _IOR('E', 0x01, int) /* get driver version */
21 #define EVIOCGID _IOR('E', 0x02, struct input_id) /* get device ID */
22 #define EVIOCGKEYCODE _IOR('E', 0x04, int[2]) /* get keycode */
23 #define EVIOCSKEYCODE _IOW('E', 0x04, int[2]) /* set keycode */
24
25 #define EVIOCGNAME(len) _IOC(_IOC_READ, 'E', 0x06, len) /* get device name */
26 #define EVIOCGPHYS(len) _IOC(_IOC_READ, 'E', 0x07, len) /* get physical location */
27 #define EVIOCGUNIQ(len) _IOC(_IOC_READ, 'E', 0x08, len) /* get unique identifier */
28
29 #define EVIOCGKEY(len) _IOC(_IOC_READ, 'E', 0x18, len) /* get global keystate */
30 #define EVIOCGLED(len) _IOC(_IOC_READ, 'E', 0x19, len) /* get all LEDs */
31 #define EVIOCGSND(len) _IOC(_IOC_READ, 'E', 0x1a, len) /* get all sounds status */
32 #define EVIOCGSW(len) _IOC(_IOC_READ, 'E', 0x1b, len) /* get all switch states */
33
34 #define EVIOCGBIT(ev,len) _IOC(_IOC_READ, 'E', 0x20 + ev, len) /* get event bits */
35 #define EVIOCGABS(abs) _IOR('E', 0x40 + abs, struct input_absinfo) /* get abs value/limits */
36 #define EVIOCSABS(abs) _IOW('E', 0xc0 + abs, struct input_absinfo) /* set abs value/limits */
37
38 #define EVIOCSFF _IOC(_IOC_WRITE, 'E', 0x80, sizeof(struct ff_effect)) /* send a force effect to a force feedback device */
39 #define EVIOCRMFF _IOW('E', 0x81, int) /* Erase a force effect */
40 #define EVIOCGEFFECTS _IOR('E', 0x84, int) /* Report number of effects playable at the same time */
41
42 #define EVIOCGRAB _IOW('E', 0x90, int) /* Grab/Release device */
43
44 // end <linux/input.h>
45
46
47
sendevent_main(int argc,char * argv[])48 int sendevent_main(int argc, char *argv[])
49 {
50 int i;
51 int fd;
52 int ret;
53 int version;
54 struct input_event event;
55
56 if(argc != 5) {
57 fprintf(stderr, "use: %s device type code value\n", argv[0]);
58 return 1;
59 }
60
61 fd = open(argv[1], O_RDWR);
62 if(fd < 0) {
63 fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno));
64 return 1;
65 }
66 if (ioctl(fd, EVIOCGVERSION, &version)) {
67 fprintf(stderr, "could not get driver version for %s, %s\n", argv[optind], strerror(errno));
68 return 1;
69 }
70 memset(&event, 0, sizeof(event));
71 event.type = atoi(argv[2]);
72 event.code = atoi(argv[3]);
73 event.value = atoi(argv[4]);
74 ret = write(fd, &event, sizeof(event));
75 if(ret < sizeof(event)) {
76 fprintf(stderr, "write event failed, %s\n", strerror(errno));
77 return -1;
78 }
79 return 0;
80 }
81