LXR linux/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/export.h>
  19#include <linux/list.h>
  20#include <linux/mutex.h>
  21
  22struct module;
  23struct device;
  24
  25struct clk;
  26struct v4l2_clk {
  27        struct list_head list;
  28        const struct v4l2_clk_ops *ops;
  29        const char *dev_id;
  30        int enable;
  31        struct mutex lock; /* Protect the enable count */
  32        atomic_t use_count;
  33        struct clk *clk;
  34        void *priv;
  35};
  36
  37struct v4l2_clk_ops {
  38        struct module   *owner;
  39        int             (*enable)(struct v4l2_clk *clk);
  40        void            (*disable)(struct v4l2_clk *clk);
  41        unsigned long   (*get_rate)(struct v4l2_clk *clk);
  42        int             (*set_rate)(struct v4l2_clk *clk, unsigned long);
  43};
  44
  45struct v4l2_clk *v4l2_clk_register(const struct v4l2_clk_ops *ops,
  46                                   const char *dev_name,
  47                                   void *priv);
  48void v4l2_clk_unregister(struct v4l2_clk *clk);
  49struct v4l2_clk *v4l2_clk_get(struct device *dev, const char *id);
  50void v4l2_clk_put(struct v4l2_clk *clk);
  51int v4l2_clk_enable(struct v4l2_clk *clk);
  52void v4l2_clk_disable(struct v4l2_clk *clk);
  53unsigned long v4l2_clk_get_rate(struct v4l2_clk *clk);
  54int v4l2_clk_set_rate(struct v4l2_clk *clk, unsigned long rate);
  55
  56struct module;
  57
  58struct v4l2_clk *__v4l2_clk_register_fixed(const char *dev_id,
  59                        unsigned long rate, struct module *owner);
  60void v4l2_clk_unregister_fixed(struct v4l2_clk *clk);
  61
  62static inline struct v4l2_clk *v4l2_clk_register_fixed(const char *dev_id,
  63                                                        unsigned long rate)
  64{
  65        return __v4l2_clk_register_fixed(dev_id, rate, THIS_MODULE);
  66}
  67
  68#define V4L2_CLK_NAME_SIZE 64
  69
  70#define v4l2_clk_name_i2c(name, size, adap, client) snprintf(name, size, \
  71                          "%d-%04x", adap, client)
  72
  73#define v4l2_clk_name_of(name, size, node) snprintf(name, size, \
  74                          "of-%pOF", node)
  75
  76#endif
  77