From 48ec55bd19362c5b8f7d06f7678321c3535672f4 Mon Sep 17 00:00:00 2001
From: PA4WDH
Date: Sat, 20 May 2023 19:27:47 +0200
Subject: Add validation and fallback to startup

---
 failsafe.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 failsafe.c

(limited to 'failsafe.c')

diff --git a/failsafe.c b/failsafe.c
new file mode 100644
index 0000000..5b3e7d3
--- /dev/null
+++ b/failsafe.c
@@ -0,0 +1,33 @@
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "cputemp2maxfreq.h"
+#include "cpufreq.h"
+
+extern struct s_cpudata cpudata;
+extern struct s_config config;
+
+void failsafe()
+{
+ printf("Failed to set governor, error %d (%s).\n",errno,strerror(errno));
+
+// We failed to set the governor, try to fail safe. First try the CPU minimum
+// frequency, if that doesn't work out try the fallback frequency
+ if (cpufreq_set_long_int("scaling_max_freq",cpudata.min_freq,100)==0)
+ {
+  printf("Set scaling frequency to CPU's minimum frequency.");
+  exit(1);
+ }
+ printf("Failed to set scaling frequency to CPU's minimum frequency, error: %d (%s).\n",errno,strerror(errno));
+
+ if (cpufreq_set_long_int("scaling_max_freq",config.fallback_freq,100)==0)
+ {
+  printf("Set scaling frequency to fallback frequency.");
+  exit(1);
+ }
+ printf("Failed to set scaling frequency to fallback frequency, error: %d (%s).\n",errno,strerror(errno));
+
+ printf("All safety measures failed, watch out not to fry your hardware.\n");
+ exit(1);
+}
-- 
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