4f528afcfb
V4L2 clocks, e.g. used by camera sensors for their master clock, do not have to be supplied by a different V4L2 driver, they can also be supplied by an independent source. In this case the standart kernel clock API should be used to handle such clocks. This patch adds support for such cases. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by: Josh Wu <josh.wu@atmel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
72 lines
2 KiB
C
72 lines
2 KiB
C
/*
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* V4L2 clock service
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*
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* Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* ATTENTION: This is a temporary API and it shall be replaced by the generic
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* clock API, when the latter becomes widely available.
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*/
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#ifndef MEDIA_V4L2_CLK_H
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#define MEDIA_V4L2_CLK_H
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#include <linux/atomic.h>
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#include <linux/export.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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struct module;
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struct device;
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struct clk;
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struct v4l2_clk {
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struct list_head list;
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const struct v4l2_clk_ops *ops;
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const char *dev_id;
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int enable;
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struct mutex lock; /* Protect the enable count */
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atomic_t use_count;
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struct clk *clk;
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void *priv;
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};
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struct v4l2_clk_ops {
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struct module *owner;
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int (*enable)(struct v4l2_clk *clk);
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void (*disable)(struct v4l2_clk *clk);
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unsigned long (*get_rate)(struct v4l2_clk *clk);
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int (*set_rate)(struct v4l2_clk *clk, unsigned long);
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};
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struct v4l2_clk *v4l2_clk_register(const struct v4l2_clk_ops *ops,
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const char *dev_name,
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void *priv);
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void v4l2_clk_unregister(struct v4l2_clk *clk);
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struct v4l2_clk *v4l2_clk_get(struct device *dev, const char *id);
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void v4l2_clk_put(struct v4l2_clk *clk);
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int v4l2_clk_enable(struct v4l2_clk *clk);
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void v4l2_clk_disable(struct v4l2_clk *clk);
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unsigned long v4l2_clk_get_rate(struct v4l2_clk *clk);
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int v4l2_clk_set_rate(struct v4l2_clk *clk, unsigned long rate);
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struct module;
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struct v4l2_clk *__v4l2_clk_register_fixed(const char *dev_id,
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unsigned long rate, struct module *owner);
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void v4l2_clk_unregister_fixed(struct v4l2_clk *clk);
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static inline struct v4l2_clk *v4l2_clk_register_fixed(const char *dev_id,
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unsigned long rate)
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{
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return __v4l2_clk_register_fixed(dev_id, rate, THIS_MODULE);
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}
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#define v4l2_clk_name_i2c(name, size, adap, client) snprintf(name, size, \
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"%d-%04x", adap, client)
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#endif
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