1 files changed, 124 insertions, 0 deletions
diff --git a/src/devices/thinkpad-fan.cpp b/src/devices/thinkpad-fan.cpp
new file mode 100644
index 0000000..8e2ce53
--- /dev/null
+++ b/src/devices/thinkpad-fan.cpp
@@ -0,0 +1,124 @@
+/*
+ * Copyright 2010, Intel Corporation
+ *
+ * This file is part of PowerTOP
+ *
+ * This program file 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; version 2 of the License.
+ *
+ * This program 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 in a file named COPYING; if not, write to the
+ * Free Software Foundation, Inc,
+ * 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ * or just google for it.
+ *
+ * Authors:
+ *	Arjan van de Ven <arjan@linux.intel.com>
+ */
+#include <iostream>
+#include <fstream>
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <math.h>
+#include <unistd.h>
+#include <limits.h>
+
+#include "../lib.h"
+
+
+#include "device.h"
+#include "thinkpad-fan.h"
+#include "../parameters/parameters.h"
+#include "../process/powerconsumer.h"
+
+#include <string.h>
+#include <unistd.h>
+
+thinkpad_fan::thinkpad_fan(): device()
+{
+	start_rate = 0;
+	end_rate = 0;
+	fan_index = get_param_index("thinkpad-fan");
+	fansqr_index = get_param_index("thinkpad-fan-sqr");
+	fancub_index = get_param_index("thinkpad-fan-cub");
+	r_index = get_result_index("thinkpad-fan");
+	register_sysfs_path("/sys/devices/platform/thinkpad_hwmon");
+}
+
+void thinkpad_fan::start_measurement(void)
+{
+	/* read the rpms of the fan */
+	start_rate = read_sysfs("/sys/devices/platform/thinkpad_hwmon/fan1_input");
+}
+
+void thinkpad_fan::end_measurement(void)
+{
+	end_rate = read_sysfs("/sys/devices/platform/thinkpad_hwmon/fan1_input");
+
+	report_utilization("thinkpad-fan", utilization());
+}
+
+
+double thinkpad_fan::utilization(void)
+{
+	return (start_rate+end_rate) / 2;
+}
+
+void create_thinkpad_fan(void)
+{
+	char filename[PATH_MAX];
+	class thinkpad_fan *fan;
+
+	pt_strcpy(filename, "/sys/devices/platform/thinkpad_hwmon/fan1_input");
+
+	if (access(filename, R_OK) !=0)
+		return;
+
+	register_parameter("thinkpad-fan", 10);
+	register_parameter("thinkpad-fan-sqr", 5);
+	register_parameter("thinkpad-fan-cub", 10);
+
+	fan = new class thinkpad_fan();
+	all_devices.push_back(fan);
+}
+
+
+
+double thinkpad_fan::power_usage(struct result_bundle *result, struct parameter_bundle *bundle)
+{
+	double power;
+	double factor;
+	double util;
+
+
+	power = 0;
+	util = get_result_value(r_index, result);
+
+	if (util < 0)
+		util = 0;
+
+
+	/* physics dictact that fan power goes cubic with the rpms, but there's also a linear component for friction*/
+	factor = get_parameter_value(fancub_index, bundle);
+	power += factor * pow(util / 3600.0, 3);
+
+	factor = get_parameter_value(fansqr_index, bundle) - 5.0;
+	power += factor * pow(util / 3600.0, 2);
+
+	factor = get_parameter_value(fan_index, bundle) - 10.0;
+	power += util / 5000.0 * factor;
+
+	if (power <= 0.0)
+		power = 0.0;
+
+	return power;
+}