From 4dc83784b22be02632cd5785a6ec34a6b7532e0e Mon Sep 17 00:00:00 2001
From: volker <volker@3ae390bd-cb1e-0410-b409-cd5a39f66f1f>
Date: Tue, 19 Feb 2013 23:17:43 +0000
Subject: new plugin raspi

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@1195 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
---
 plugin_raspi.c | 151 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 plugin_raspi.c

(limited to 'plugin_raspi.c')

diff --git a/plugin_raspi.c b/plugin_raspi.c
new file mode 100644
index 0000000..bd1dea8
--- /dev/null
+++ b/plugin_raspi.c
@@ -0,0 +1,151 @@
+/* $Id$
+ * $URL$
+ *
+ * plugin raspi
+ *
+ * Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
+ * Copyright (C) 2013 Volker Gerng <v.gering@t-online.de>
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/* 
+ * exported functions:
+ *
+ * int plugin_init_raspi (void)
+ *  adds functions to get information about internal sensors of raspberry pi
+ *
+ */
+
+
+#include "config.h"
+
+/* these should always be included */
+#include "debug.h"
+#include "plugin.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#ifdef WITH_DMALLOC
+#include <dmalloc.h>
+#endif
+
+
+#define RASPI_FREQ_PATH   "/sys/devices/system/cpu/cpu0/cpufreq/"
+#define RASPI_FREQ_VALUE  "cpuinfo_cur_freq"
+#define RASPI_FREQ_IDFILE "scaling_driver"
+#define RASPI_TEMP_PATH   "/sys/class/thermal/thermal_zone0/"
+#define RASPI_TEMP_VALUE  "temp"
+#define RASPI_TEMP_IDFILE "type"
+#define RASPI_TEMP_ID     "bcm2835_thermal"
+
+#define _cat(a,b)     (a##b)
+#define strings(a, b) "_cat(a,b)"
+
+
+char tmpstr[128];
+
+
+/* Note: all local functions should be declared 'static' */
+
+/* reading an positive integer value from path, -1 on error */
+static int readValue(char *path) {
+    int value = -1;
+    FILE *fp;
+
+    fp = fopen(path, "r");
+    if (NULL != fp) {
+        fgets(tmpstr, sizeof(tmpstr), fp);
+        fclose(fp);
+	if (1 != sscanf(tmpstr, "%i", &value)) {
+            error("[raspi] error reading integer value from %s\n", path);
+        }
+    } else {
+        error("[raspi] error opening %s: %s\n", path, strerror(errno));
+    }
+
+    return value;
+}
+
+
+/* reads a string from path */
+static char* readStr(char *path) {
+    FILE *fp;
+
+    memset(tmpstr, 0, sizeof(tmpstr));
+    fp = fopen(path, "r");
+    if (NULL != fp) {
+        fgets(tmpstr, sizeof(tmpstr), fp);
+        fclose(fp);
+    } else {
+        error("[raspi] error reading text value from %s: %s\n", path, strerror(errno));
+    }
+
+    return tmpstr;
+}
+
+
+/* reads the actual cpu frequency of the bcm2708 cpu */
+static void my_cpufreq(RESULT * result)
+{
+    snprintf(tmpstr, sizeof(tmpstr), "%s%s", RASPI_FREQ_PATH, RASPI_FREQ_VALUE);
+    double value = readValue(tmpstr) / 1000.0L;
+
+    info("[raspi] actual cpu frequency: %.2f MHz", value);
+    SetResult(&result, R_NUMBER, &value);
+}
+
+
+/* reads the actual cpu temperature in degree Celsius */
+static void my_cputemp(RESULT * result)
+{
+    snprintf(tmpstr, sizeof(tmpstr), "%s%s", RASPI_TEMP_PATH, RASPI_TEMP_VALUE);
+    double value = readValue(tmpstr) / 1000.0L;
+
+    info("[raspi] actual cpu temperature: %.1f C", value);
+    SetResult(&result, R_NUMBER, &value);
+}
+
+
+/* plugin initialization */
+/* MUST NOT be declared 'static'! */
+int plugin_init_raspi(void)
+{
+    char checkFile[128];
+
+    AddFunction("raspi::cpufreq", 0, my_cpufreq);
+    AddFunction("raspi::cputemp", 0, my_cputemp);
+
+    snprintf(checkFile, sizeof(checkFile), "%s%s", RASPI_TEMP_PATH, RASPI_TEMP_IDFILE);
+    if (strncmp( readStr(checkFile), RASPI_TEMP_ID, strlen(RASPI_TEMP_ID) ) != 0) {
+        error("Warning: no raspberry pi thermal sensor found: value of '%s' is '%s', should be '%s'",
+              checkFile, readStr(checkFile), RASPI_TEMP_IDFILE);
+    }
+
+    return 0;
+}
+
+void plugin_exit_raspi(void)
+{
+    /* free any allocated memory */
+    /* close filedescriptors */
+}
-- 
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