thermal: devfreq_cooling: Add generic devfreq cooling device implementaion

This patch add the generic devfreq cooling device based on devfreq framework.
The devfreq device is used as cooling device.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

1 files changed, 80 insertions, 0 deletions

diff --git a/include/linux/devfreq_cooling.h b/include/linux/devfreq_cooling.h
new file mode 100644
index 000000000000..194cfa97fc75
--- /dev/null
+++ b/include/linux/devfreq_cooling.h
@@ -0,0 +1,80 @@
+/*
+ *  linux/include/linux/devfreq_cooling.h
+ *
+ *  Copyright (C) 2015 Samsung Electronics Co., Ltd
+ *  Author: Chanwoo Choi <cw00.choi@samsung.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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#ifndef __DEVFREQ_COOLING_H__
+#define __DEVFREQ_COOLING_H__
+
+#include <linux/of.h>
+#include <linux/thermal.h>
+#include <linux/devfreq.h>
+
+#ifdef CONFIG_DEVFREQ_THERMAL
+/**
+ * devfreq_cooling_register - function to create cpufreq cooling device.
+ * @devfreq:	the devfreq instance.
+ */
+struct thermal_cooling_device *
+devfreq_cooling_register(struct devfreq *devfreq);
+
+/**
+ * of_devfreq_cooling_register - create cpufreq cooling device based on DT.
+ * @np:		a valid struct device_node to the cooling device tree node
+ * @devfreq:	the devfreq instance.
+ */
+#ifdef CONFIG_THERMAL_OF
+struct thermal_cooling_device *
+of_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq);
+#else
+static inline struct thermal_cooling_device *
+of_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq)
+{
+	return ERR_PTR(-ENOSYS);
+}
+#endif
+
+/**
+ * devfreq_cooling_unregister - function to remove cpufreq cooling device.
+ * @cdev: thermal cooling device pointer.
+ */
+void devfreq_cooling_unregister(struct thermal_cooling_device *cdev);
+
+unsigned long devfreq_cooling_get_level(unsigned int cpu, unsigned int freq);
+#else /* !CONFIG_DEVFREQ_THERMAL */
+static inline struct thermal_cooling_device *
+devfreq_cooling_register(struct devfreq *devfreq)
+{
+	return ERR_PTR(-ENOSYS);
+}
+static inline struct thermal_cooling_device *
+of_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
+static inline
+void devfreq_cooling_unregister(struct thermal_cooling_device *cdev)
+{
+	return;
+}
+#endif	/* CONFIG_DEVFREQ_THERMAL */
+#endif /* __DEVFREQ_COOLING_H__ */