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kernel/linux-rt-4.4.41/include/media/v4l2-clk.h 1.98 KB
5113f6f70   김현기   kernel add
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  /*
   * 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