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// SPDX-License-Identifier: GPL-2.0
/*
* Hidraw Userspace Example
*
* Copyright (c) 2010 Alan Ott <alan@signal11.us>
* Copyright (c) 2010 Signal 11 Software
*
* The code may be used by anyone for any purpose,
* and can serve as a starting point for developing
* applications using hidraw.
*/
/* Linux */
#include <linux/types.h>
#include <linux/input.h>
#include <linux/hidraw.h>
/* Unix */
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
/* C */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <stdint.h>
typedef struct
{
uint8_t r;
uint8_t g;
uint8_t b;
} C;
#define N_LEDS 9
static unsigned map[N_LEDS]={2,1,0,3,4,5,8,7,6};
C current[N_LEDS];
C last[N_LEDS];
void
sync_leds (int fd)
{
unsigned i;
uint8_t buf[8];
for (i = 0; i < N_LEDS; ++i)
{
/* Send a Report to the Device */
if ((last[i].r != current[i].r)
|| (last[i].g != current[i].g) || (last[i].b != current[i].b))
{
buf[0] = 0x05;
buf[1] = map[i];
buf[2] = current[i].r;
buf[3] = current[i].g;
buf[4] = current[i].b;
write (fd, buf, 8);
last[i] = current[i];
}
}
}
unsigned f(int v)
{
v-=5;
if (v<0) return 0;
return v;
}
void fade_leds(int fd)
{
unsigned i;
for (i = 0; i < N_LEDS; ++i)
{
current[i].r=f(current[i].r);
current[i].g=f(current[i].g);
current[i].b=f(current[i].b);
}
sync_leds(fd);
}
int
open_kb (int *fds)
{
struct hidraw_devinfo info;
unsigned i;
int n = 0;
for (i = 0; i < 128; ++i)
{
int fd;
char device[128];
char buf[128];
sprintf (device, "/dev/hidraw%d", i);
fd = open (device, O_RDWR | O_NONBLOCK);
if (fd < 0)
continue;
memset (buf, 0, sizeof (buf));
ioctl (fd, HIDIOCGRAWNAME (256), buf);
buf[sizeof (buf) - 1] = 0;
if (strcmp (buf, "YMDK YMD09_32A"))
{
close (fd);
fd = -1;
continue;
}
fds[n++] = fd;
}
if (n < 2)
{
printf ("Devices not found\n");
return -1;
}
return 0;
}
int
main (int argc, char **argv)
{
int fds[2];
fd_set rfds;
ssize_t len;
char buf[32];
struct timeval tv;
unsigned j, k;
memset (last, 0xff, sizeof (last));
if (open_kb (fds))
return -1;
current[4].g=0xff;
FD_ZERO (&rfds);
sync_leds (fds[1]);
tv.tv_sec=0;
tv.tv_usec=0;
for (;;)
{
FD_SET (fds[0], &rfds);
if (!tv.tv_usec)
tv.tv_usec=20000;
switch (select (fds[0] + 1, &rfds, NULL, NULL, &tv))
{
case -1:
break;
case 1:
len = read (fds[0], buf, sizeof (buf));
if (len < 3)
break;
for (j = 2; j < len; ++j)
{
if (!buf[j]) continue;
k = buf[j] - 4;
current[k].r = rand() & 0xff ;
current[k].g = rand() & 0xff ;
current[k].b = rand() & 0xff ;
}
sync_leds (fds[1]);
break;
case 0:
fade_leds(fds[1]);
}
}
close (fds[1]);
close (fds[0]);
return 0;
}
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