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Current File : //proc/16354/root/lib/modules/3.10.0-957.10.1.el7.x86_64/source/include/linux/posix-clock.h
/*
 * posix-clock.h - support for dynamic clock devices
 *
 * Copyright (C) 2010 OMICRON electronics GmbH
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#ifndef _LINUX_POSIX_CLOCK_H_
#define _LINUX_POSIX_CLOCK_H_

#include <linux/cdev.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/posix-timers.h>
#include <linux/rwsem.h>

struct posix_clock;

/**
 * struct posix_clock_operations - functional interface to the clock
 *
 * Every posix clock is represented by a character device. Drivers may
 * optionally offer extended capabilities by implementing the
 * character device methods. The character device file operations are
 * first handled by the clock device layer, then passed on to the
 * driver by calling these functions.
 *
 * @owner:          The clock driver should set to THIS_MODULE
 * @clock_adjtime:  Adjust the clock
 * @clock_gettime:  Read the current time
 * @clock_getres:   Get the clock resolution
 * @clock_settime:  Set the current time value
 * @timer_create:   Create a new timer
 * @timer_delete:   Remove a previously created timer
 * @timer_gettime:  Get remaining time and interval of a timer
 * @timer_settime: Set a timer's initial expiration and interval
 * @fasync:         Optional character device fasync method
 * @mmap:           Optional character device mmap method
 * @open:           Optional character device open method
 * @release:        Optional character device release method
 * @ioctl:          Optional character device ioctl method
 * @read:           Optional character device read method
 * @poll:           Optional character device poll method
 */
struct posix_clock_operations {
	struct module *owner;

	int  (*clock_adjtime)(struct posix_clock *pc, struct timex *tx);

	int  (*clock_gettime)(struct posix_clock *pc, struct timespec *ts);

	int  (*clock_getres) (struct posix_clock *pc, struct timespec *ts);

	int  (*clock_settime)(struct posix_clock *pc,
			      const struct timespec *ts);

	int  (*timer_create) (struct posix_clock *pc, struct k_itimer *kit);

	int  (*timer_delete) (struct posix_clock *pc, struct k_itimer *kit);

	void (*timer_gettime)(struct posix_clock *pc,
			      struct k_itimer *kit, struct itimerspec *tsp);

	int  (*timer_settime)(struct posix_clock *pc,
			      struct k_itimer *kit, int flags,
			      struct itimerspec *tsp, struct itimerspec *old);
	/*
	 * Optional character device methods:
	 */
	int     (*fasync)  (struct posix_clock *pc,
			    int fd, struct file *file, int on);

	long    (*ioctl)   (struct posix_clock *pc,
			    unsigned int cmd, unsigned long arg);

	int     (*mmap)    (struct posix_clock *pc,
			    struct vm_area_struct *vma);

	int     (*open)    (struct posix_clock *pc, fmode_t f_mode);

	uint    (*poll)    (struct posix_clock *pc,
			    struct file *file, poll_table *wait);

	int     (*release) (struct posix_clock *pc);

	ssize_t (*read)    (struct posix_clock *pc,
			    uint flags, char __user *buf, size_t cnt);
};

/**
 * struct posix_clock - represents a dynamic posix clock
 *
 * @ops:     Functional interface to the clock
 * @cdev:    Character device instance for this clock
 * @kref:    Reference count.
 * @rwsem:   Protects the 'zombie' field from concurrent access.
 * @zombie:  If 'zombie' is true, then the hardware has disappeared.
 * @release: A function to free the structure when the reference count reaches
 *           zero. May be NULL if structure is statically allocated.
 *
 * Drivers should embed their struct posix_clock within a private
 * structure, obtaining a reference to it during callbacks using
 * container_of().
 */
struct posix_clock {
	struct posix_clock_operations ops;
	struct cdev cdev;
	struct kref kref;
	struct rw_semaphore rwsem;
	bool zombie;
	void (*release)(struct posix_clock *clk);
};

/**
 * posix_clock_register() - register a new clock
 * @clk:   Pointer to the clock. Caller must provide 'ops' and 'release'
 * @devid: Allocated device id
 *
 * A clock driver calls this function to register itself with the
 * clock device subsystem. If 'clk' points to dynamically allocated
 * memory, then the caller must provide a 'release' function to free
 * that memory.
 *
 * Returns zero on success, non-zero otherwise.
 */
int posix_clock_register(struct posix_clock *clk, dev_t devid);

/**
 * posix_clock_unregister() - unregister a clock
 * @clk: Clock instance previously registered via posix_clock_register()
 *
 * A clock driver calls this function to remove itself from the clock
 * device subsystem. The posix_clock itself will remain (in an
 * inactive state) until its reference count drops to zero, at which
 * point it will be deallocated with its 'release' method.
 */
void posix_clock_unregister(struct posix_clock *clk);

#endif

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