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_i2c(name, size, adap, client) snprintf(name, size, \ 69 "%d-%04x", adap, client) 70 71#endif 72