initial commit

Makefile

@@ -0,0 +1,3 @@
+main : main.c
+	gcc -o main main.c
+	sudo chmod a+r /dev/input/by-id/usb-MAX_Falcon_20_RGB-if02-event-kbd

main.c

@@ -0,0 +1,137 @@
+// https://stackoverflow.com/questions/20943322/accessing-keys-from-linux-input-device
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <linux/input.h>
+#include <string.h>
+#include <stdio.h>
+
+static const char *const evval[3] = {
+    "RELEASED",
+    "PRESSED ",
+    "REPEATED"
+};
+
+/**
+ * +--+--+--+--+
+ * |30|48|46|32|
+ * +--+--+--+--+
+ * |18|33|34|35|
+ * +--+--+--+--+
+ * |23|36|37|38|
+ * +--+--+--+--+
+ * |50|49|24|25|
+ * +--+--+--+--+
+ * |16|19|31|20|
+ * +--+--+--+--+
+* */
+
+enum p_key {
+    p11 = 30,
+    p12 = 48,
+    p13 = 46,
+    p14 = 32,
+    p21 = 18,
+    p22 = 33,
+    p23 = 34,
+    p24 = 35,
+    p31 = 23,
+    p32 = 36,
+    p33 = 37,
+    p34 = 38,
+    p41 = 50,
+    p42 = 49,
+    p43 = 24,
+    p44 = 25,
+    p51 = 16,
+    p52 = 19,
+    p53 = 31,
+    p54 = 20
+};
+
+int main(void)
+{
+    const char* dev = "/dev/input/by-id/usb-MAX_Falcon_20_RGB-if02-event-kbd"; //at.event26
+    struct input_event ev;
+    ssize_t n;
+    int fd;
+
+    fd = open(dev, O_RDONLY);
+    if (fd == -1) {
+        fprintf(stderr, "Cannot open %s: %s.\n", dev, strerror(errno));
+        return EXIT_FAILURE;
+    }
+
+    // This grabs the device, so the we do not just listen to events but we actually consume them! This way the keypresses are not handled by any other handler!
+    // https://stackoverflow.com/questions/29942421/read-barcodes-from-input-event-linux-c/29956584#29956584
+    if (ioctl(fd, EVIOCGRAB, 1)) {
+        const int saved_errno = errno;
+        close(fd);
+        return errno = (saved_errno) ? errno : EACCES;
+    }
+
+    // Main-Loop
+    while (1) {
+        n = read(fd, &ev, sizeof ev);
+        //n = ioctl(fd, EVIOCGRAB, 1);
+        if (n == (ssize_t)-1) {
+            if (errno == EINTR)
+                continue;
+            else
+                break;
+        } else
+        if (n != sizeof ev) {
+            errno = EIO;
+            break;
+        }
+        if (ev.type == EV_KEY && ev.value >= 0 && ev.value <= 2) {
+            //printf("%s 0x%04x (%d)\n", evval[ev.value], (int)ev.code, (int)ev.code);
+            if (evval[ev.value] == "RELEASED") {
+                switch((int)ev.code) {
+                    case p11: 
+                        system("notify-send 'Screenlayout: default'; /home/tbehrendt/.screenlayout/default.sh"); 
+                        break;
+                    case p12: 
+                        system("notify-send 'Screenlayout: main low res'; /home/tbehrendt/.screenlayout/main_low_res.sh"); 
+                        break;
+                    case p13: 
+                        system("notify-send 'Screenlayout: tv mirror'; /home/tbehrendt/.screenlayout/tv_mirror.sh"); 
+                        break;
+                    case p14: 
+                        system("notify-send 'Screenlayout: tv standalone'; /home/tbehrendt/.screenlayout/tv_standalone.sh");
+                        break;
+                    case p21: printf("p21\n"); break;
+                    case p22: printf("p22\n"); break;
+                    case p23: printf("p23\n"); break;
+                    case p24: printf("p24\n"); break;
+                    case p31: printf("p31\n"); break;
+                    case p32: printf("p32\n"); break;
+                    case p33: printf("p33\n"); break;
+                    case p34: printf("p34\n"); break;
+                    case p41: printf("p41\n"); break;
+                    case p42: printf("p42\n"); break;
+                    case p43: printf("p43\n"); break;
+                    case p44: printf("p44\n"); break;
+                    case p51: 
+                        system("notify-send mute toggled;pactl set-sink-mute @DEFAULT_SINK@ toggle");
+                        break;
+                    case p52: 
+                        system("notify-send 'VOL +5%'; pactl set-sink-volume @DEFAULT_SINK@ +5%");
+                        break;
+                    case p53:
+                        system("notify-send 'VOL -5%'; pactl set-sink-volume @DEFAULT_SINK@ -5%");
+                        break;
+                    case p54: 
+                        system("/home/tbehrendt/.scripts/makroboard/p51.sh &");
+                        break;
+                }
+            }
+        }
+
+    }
+    fflush(stdout);
+    fprintf(stderr, "%s.\n", strerror(errno));
+    return EXIT_FAILURE;
+}