Thermal: Add a thermal notifier for user space
This patch registers a governor which will let the
user land manage the platform thermals. Whenever a
trip happens, this governor just notifies the user
space using kobj_uevent().
Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/drivers/thermal/user_space.c b/drivers/thermal/user_space.c
new file mode 100644
index 0000000..fb246b90
--- /dev/null
+++ b/drivers/thermal/user_space.c
@@ -0,0 +1,68 @@
+/*
+ * user_space.c - A simple user space Thermal events notifier
+ *
+ * Copyright (C) 2012 Intel Corp
+ * Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program 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; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+
+/**
+ * notify_user_space - Notifies user space about thermal events
+ * @tz - thermal_zone_device
+ *
+ * This function notifies the user space through UEvents.
+ */
+int notify_user_space(struct thermal_zone_device *tz, int trip)
+{
+ mutex_lock(&tz->lock);
+ kobject_uevent(&tz->device.kobj, KOBJ_CHANGE);
+ mutex_unlock(&tz->lock);
+ return 0;
+}
+
+struct thermal_governor thermal_gov_user_space = {
+ .name = "user_space",
+ .throttle = notify_user_space,
+ .owner = THIS_MODULE,
+};
+
+static int __init thermal_gov_user_space_init(void)
+{
+ return thermal_register_governor(&thermal_gov_user_space);
+}
+
+static void __exit thermal_gov_user_space_exit(void)
+{
+ thermal_unregister_governor(&thermal_gov_user_space);
+}
+
+/* This should load after thermal framework */
+fs_initcall(thermal_gov_user_space_init);
+module_exit(thermal_gov_user_space_exit);
+
+MODULE_AUTHOR("Durgadoss R");
+MODULE_DESCRIPTION("A user space Thermal notifier");
+MODULE_LICENSE("GPL");