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include/linux/posix-clock.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* * posix-clock.h - support for dynamic clock devices * * Copyright (C) 2010 OMICRON electronics GmbH |
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*/ #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> |
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#include <linux/rwsem.h> |
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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 |
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* @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; |
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int (*clock_adjtime)(struct posix_clock *pc, struct __kernel_timex *tx); |
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int (*clock_gettime)(struct posix_clock *pc, struct timespec64 *ts); |
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int (*clock_getres) (struct posix_clock *pc, struct timespec64 *ts); |
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int (*clock_settime)(struct posix_clock *pc, |
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const struct timespec64 *ts); |
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/* * Optional character device methods: */ |
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long (*ioctl) (struct posix_clock *pc, unsigned int cmd, unsigned long arg); |
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int (*open) (struct posix_clock *pc, fmode_t f_mode); |
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__poll_t (*poll) (struct posix_clock *pc, |
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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 |
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* @dev: Pointer to the clock's device. |
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* @rwsem: Protects the 'zombie' field from concurrent access. |
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* @zombie: If 'zombie' is true, then the hardware has disappeared. |
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* * Drivers should embed their struct posix_clock within a private * structure, obtaining a reference to it during callbacks using * container_of(). |
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* * Drivers should supply an initialized but not exposed struct device * to posix_clock_register(). It is used to manage lifetime of the * driver's private structure. It's 'release' field should be set to * a release function for this private structure. |
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*/ struct posix_clock { struct posix_clock_operations ops; struct cdev cdev; |
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struct device *dev; |
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struct rw_semaphore rwsem; |
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bool zombie; |
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}; /** * posix_clock_register() - register a new clock |
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* @clk: Pointer to the clock. Caller must provide 'ops' field * @dev: Pointer to the initialized device. Caller must provide * 'release' field |
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* * 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. */ |
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int posix_clock_register(struct posix_clock *clk, struct device *dev); |
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/** * 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 |