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-rw-r--r--kernel/include/media/v4l2-clk.h71
1 files changed, 71 insertions, 0 deletions
diff --git a/kernel/include/media/v4l2-clk.h b/kernel/include/media/v4l2-clk.h
new file mode 100644
index 000000000..3ef6e3d5e
--- /dev/null
+++ b/kernel/include/media/v4l2-clk.h
@@ -0,0 +1,71 @@
+/*
+ * V4L2 clock service
+ *
+ * Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * ATTENTION: This is a temporary API and it shall be replaced by the generic
+ * clock API, when the latter becomes widely available.
+ */
+
+#ifndef MEDIA_V4L2_CLK_H
+#define MEDIA_V4L2_CLK_H
+
+#include <linux/atomic.h>
+#include <linux/export.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+
+struct module;
+struct device;
+
+struct clk;
+struct v4l2_clk {
+ struct list_head list;
+ const struct v4l2_clk_ops *ops;
+ const char *dev_id;
+ int enable;
+ struct mutex lock; /* Protect the enable count */
+ atomic_t use_count;
+ struct clk *clk;
+ void *priv;
+};
+
+struct v4l2_clk_ops {
+ struct module *owner;
+ int (*enable)(struct v4l2_clk *clk);
+ void (*disable)(struct v4l2_clk *clk);
+ unsigned long (*get_rate)(struct v4l2_clk *clk);
+ int (*set_rate)(struct v4l2_clk *clk, unsigned long);
+};
+
+struct v4l2_clk *v4l2_clk_register(const struct v4l2_clk_ops *ops,
+ const char *dev_name,
+ void *priv);
+void v4l2_clk_unregister(struct v4l2_clk *clk);
+struct v4l2_clk *v4l2_clk_get(struct device *dev, const char *id);
+void v4l2_clk_put(struct v4l2_clk *clk);
+int v4l2_clk_enable(struct v4l2_clk *clk);
+void v4l2_clk_disable(struct v4l2_clk *clk);
+unsigned long v4l2_clk_get_rate(struct v4l2_clk *clk);
+int v4l2_clk_set_rate(struct v4l2_clk *clk, unsigned long rate);
+
+struct module;
+
+struct v4l2_clk *__v4l2_clk_register_fixed(const char *dev_id,
+ unsigned long rate, struct module *owner);
+void v4l2_clk_unregister_fixed(struct v4l2_clk *clk);
+
+static inline struct v4l2_clk *v4l2_clk_register_fixed(const char *dev_id,
+ unsigned long rate)
+{
+ return __v4l2_clk_register_fixed(dev_id, rate, THIS_MODULE);
+}
+
+#define v4l2_clk_name_i2c(name, size, adap, client) snprintf(name, size, \
+ "%d-%04x", adap, client)
+
+#endif