From 41794581a04554eb58e4d86d2d2ae010c7e19e1d Mon Sep 17 00:00:00 2001
From: Viljami Ilola <viljami.ilola@helsinki.fi>
Date: Thu, 24 Sep 2026 10:07:57 +0300
Subject: initial & final

---
 Makefile   |  2 ++
 wild-led.c | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 Makefile
 create mode 100644 wild-led.c

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..13fd7ba
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+wild-led: wild-led.c
+	gcc -Wall -O3 -o wild-led wild-led.c
diff --git a/wild-led.c b/wild-led.c
new file mode 100644
index 0000000..2410fef
--- /dev/null
+++ b/wild-led.c
@@ -0,0 +1,25 @@
+#include <unistd.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <sys/random.h>
+
+#define LED_FILE	"/sys/devices/platform/thinkpad_acpi/leds/tpacpi::lid_logo_dot/brightness"
+
+int main(void) {
+    int fd_led;
+    uint32_t r[1];
+    
+    fd_led = open(LED_FILE, O_WRONLY);
+    if (fd_led == -1) {
+        write(2,"Can't open led control file.\n",29);
+        return -1;
+    }
+    while(1) {
+        usleep(50000);
+        write(fd_led,"0",2);
+        getrandom(r, sizeof(*r), GRND_NONBLOCK);
+        usleep(*r&0x001fffff);
+        write(fd_led,"255",4);
+    }
+    return 0;
+}
\ No newline at end of file
-- 
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