include/media/v4l2-clk.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * V4L2 clock service
   4  *
   5  * Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
   6  *
   7  * ATTENTION: This is a temporary API and it shall be replaced by the generic
   8  * clock API, when the latter becomes widely available.
   9  */
  10
  11 #ifndef MEDIA_V4L2_CLK_H
  12 #define MEDIA_V4L2_CLK_H
  13
  14 #include <linux/atomic.h>
  15 #include <linux/export.h>
  16 #include <linux/list.h>
  17 #include <linux/mutex.h>
  18
  19 struct module;
  20 struct device;
  21
  22 struct clk;
  23 struct v4l2_clk {
  24         struct list_head list;
  25         const struct v4l2_clk_ops *ops;
  26         const char *dev_id;
  27         int enable;
  28         struct mutex lock; /* Protect the enable count */
  29         atomic_t use_count;
  30         struct clk *clk;
  31         void *priv;
  32 };
  33
  34 struct v4l2_clk_ops {
  35         struct module   *owner;
  36         int             (*enable)(struct v4l2_clk *clk);
  37         void            (*disable)(struct v4l2_clk *clk);
  38         unsigned long   (*get_rate)(struct v4l2_clk *clk);
  39         int             (*set_rate)(struct v4l2_clk *clk, unsigned long);
  40 };
  41
  42 struct v4l2_clk *v4l2_clk_register(const struct v4l2_clk_ops *ops,
  43                                    const char *dev_name,
  44                                    void *priv);
  45 void v4l2_clk_unregister(struct v4l2_clk *clk);
  46 struct v4l2_clk *v4l2_clk_get(struct device *dev, const char *id);
  47 void v4l2_clk_put(struct v4l2_clk *clk);
  48 int v4l2_clk_enable(struct v4l2_clk *clk);
  49 void v4l2_clk_disable(struct v4l2_clk *clk);
  50 unsigned long v4l2_clk_get_rate(struct v4l2_clk *clk);
  51 int v4l2_clk_set_rate(struct v4l2_clk *clk, unsigned long rate);
  52
  53 struct module;
  54
  55 struct v4l2_clk *__v4l2_clk_register_fixed(const char *dev_id,
  56                         unsigned long rate, struct module *owner);
  57 void v4l2_clk_unregister_fixed(struct v4l2_clk *clk);
  58
  59 static inline struct v4l2_clk *v4l2_clk_register_fixed(const char *dev_id,
  60                                                         unsigned long rate)
  61 {
  62         return __v4l2_clk_register_fixed(dev_id, rate, THIS_MODULE);
  63 }
  64
  65 #define V4L2_CLK_NAME_SIZE 64
  66
  67 #define v4l2_clk_name_i2c(name, size, adap, client) snprintf(name, size, \
  68                           "%d-%04x", adap, client)
  69
  70 #define v4l2_clk_name_of(name, size, node) snprintf(name, size, \
  71                           "of-%pOF", node)
  72
  73 #endif