blob: 7ec857f805a6c724fbd06d3c1708fb1c6be8fabc [file] [log] [blame]
* V4L2 clock service
* Copyright (C) 2012-2013, Guennadi Liakhovetski <>
* 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_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, node) snprintf(name, size, \
"of-%pOF", node)