include/media/v4l2-clk.h

   1 /*
   2  * V4L2 clock service
   3  *
   4  * Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * ATTENTION: This is a temporary API and it shall be replaced by the generic
  11  * clock API, when the latter becomes widely available.
  12  */
  13
  14 #ifndef MEDIA_V4L2_CLK_H
  15 #define MEDIA_V4L2_CLK_H
  16
  17 #include <linux/atomic.h>
  18 #include <linux/list.h>
  19 #include <linux/mutex.h>
  20
  21 struct module;
  22 struct device;
  23
  24 struct v4l2_clk {
  25         struct list_head list;
  26         const struct v4l2_clk_ops *ops;
  27         const char *dev_id;
  28         const char *id;
  29         int enable;
  30         struct mutex lock; /* Protect the enable count */
  31         atomic_t use_count;
  32         void *priv;
  33 };
  34
  35 struct v4l2_clk_ops {
  36         struct module   *owner;
  37         int             (*enable)(struct v4l2_clk *clk);
  38         void            (*disable)(struct v4l2_clk *clk);
  39         unsigned long   (*get_rate)(struct v4l2_clk *clk);
  40         int             (*set_rate)(struct v4l2_clk *clk, unsigned long);
  41 };
  42
  43 struct v4l2_clk *v4l2_clk_register(const struct v4l2_clk_ops *ops,
  44                                    const char *dev_name,
  45                                    const char *name, void *priv);
  46 void v4l2_clk_unregister(struct v4l2_clk *clk);
  47 struct v4l2_clk *v4l2_clk_get(struct device *dev, const char *id);
  48 void v4l2_clk_put(struct v4l2_clk *clk);
  49 int v4l2_clk_enable(struct v4l2_clk *clk);
  50 void v4l2_clk_disable(struct v4l2_clk *clk);
  51 unsigned long v4l2_clk_get_rate(struct v4l2_clk *clk);
  52 int v4l2_clk_set_rate(struct v4l2_clk *clk, unsigned long rate);
  53
  54 #endif