Release 4.7 include/media/v4l2-clk.h

/*
 * 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);
}

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#define V4L2_CLK_NAME_SIZE 64


#define v4l2_clk_name_i2c(name, size, adap, client) snprintf(name, size, \
                          "%d-%04x", adap, client)


#define v4l2_clk_name_of(name, size, of_full_name) snprintf(name, size, \
                          "of-%s", of_full_name)

#endif
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