1 files changed, 129 insertions, 0 deletions
diff --git a/src/tuning/tuningi2c.cpp b/src/tuning/tuningi2c.cpp
new file mode 100644
index 0000000..b75e811
--- /dev/null
+++ b/src/tuning/tuningi2c.cpp
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2015, 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.
+ *
+ * Authors:
+ *	Arjan van de Ven <arjan@linux.intel.com>
+ *	Daniel Leung <daniel.leung@linux.intel.com>
+ */
+
+#include "tuning.h"
+#include "tunable.h"
+#include "unistd.h"
+#include "tuningi2c.h"
+#include <string.h>
+#include <dirent.h>
+#include <utility>
+#include <iostream>
+#include <fstream>
+#include <ctype.h>
+#include <limits.h>
+
+#include "../lib.h"
+#include "../devices/runtime_pm.h"
+
+i2c_tunable::i2c_tunable(const char *path, const char *name, bool is_adapter) : tunable("", 0.9, _("Good"), _("Bad"), _("Unknown"))
+{
+	ifstream file;
+	char filename[PATH_MAX];
+	string devname;
+
+	snprintf(filename, sizeof(filename), "%s/name", path);
+	file.open(filename, ios::in);
+	if (file) {
+		getline(file, devname);
+		file.close();
+	}
+
+	if (is_adapter) {
+		snprintf(i2c_path, sizeof(i2c_path), "%s/device/power/control", path);
+		snprintf(filename, sizeof(filename), "%s/device", path);
+	} else {
+		snprintf(i2c_path, sizeof(i2c_path),  "%s/power/control", path);
+		snprintf(filename, sizeof(filename), "%s/device", path);
+	}
+
+	if (device_has_runtime_pm(filename))
+		snprintf(desc, sizeof(desc), _("Runtime PM for I2C %s %s (%s)"), (is_adapter ? _("Adapter") : _("Device")), name, (devname.empty() ? "" : devname.c_str()));
+	else
+		snprintf(desc, sizeof(desc), _("I2C %s %s has no runtime power management"), (is_adapter ? _("Adapter") : _("Device")), name);
+
+	snprintf(toggle_good, sizeof(toggle_good), "echo 'auto' > '%s';", i2c_path);
+	snprintf(toggle_bad, sizeof(toggle_bad), "echo 'on' > '%s';", i2c_path);
+}
+
+int i2c_tunable::good_bad(void)
+{
+	string content;
+
+	content = read_sysfs_string(i2c_path);
+
+	if (strcmp(content.c_str(), "auto") == 0)
+		return TUNE_GOOD;
+
+	return TUNE_BAD;
+}
+
+void i2c_tunable::toggle(void)
+{
+	int good;
+	good = good_bad();
+
+	if (good == TUNE_GOOD) {
+		write_sysfs(i2c_path, "on");
+		return;
+	}
+
+	write_sysfs(i2c_path, "auto");
+}
+
+const char *i2c_tunable::toggle_script(void)
+{
+	int good;
+	good = good_bad();
+
+	if (good == TUNE_GOOD) {
+		return toggle_bad;
+	}
+
+	return toggle_good;
+}
+
+static void add_i2c_callback(const char *d_name)
+{
+	class i2c_tunable *i2c;
+	char filename[PATH_MAX];
+	bool is_adapter = false;
+
+	snprintf(filename, PATH_MAX, "/sys/bus/i2c/devices/%s/new_device", d_name);
+	if (access(filename, W_OK) == 0)
+		is_adapter = true;
+
+	snprintf(filename, PATH_MAX, "/sys/bus/i2c/devices/%s", d_name);
+	i2c = new class i2c_tunable(filename, d_name, is_adapter);
+
+	if (is_adapter)
+		snprintf(filename, PATH_MAX, "/sys/bus/i2c/devices/%s/device", d_name);
+	else
+		snprintf(filename, PATH_MAX, "/sys/bus/i2c/devices/%s", d_name);
+
+	if (device_has_runtime_pm(filename))
+		all_tunables.push_back(i2c);
+	else
+		all_untunables.push_back(i2c);
+}
+
+void add_i2c_tunables(void)
+{
+	process_directory("/sys/bus/i2c/devices/", add_i2c_callback);
+}