74ba9207e1
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* PTP 1588 clock support - private declarations for the core module.
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*
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* Copyright (C) 2010 OMICRON electronics GmbH
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*/
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#ifndef _PTP_PRIVATE_H_
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#define _PTP_PRIVATE_H_
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#include <linux/cdev.h>
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#include <linux/device.h>
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#include <linux/kthread.h>
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#include <linux/mutex.h>
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#include <linux/posix-clock.h>
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#include <linux/ptp_clock.h>
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#include <linux/ptp_clock_kernel.h>
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#include <linux/time.h>
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#define PTP_MAX_TIMESTAMPS 128
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#define PTP_BUF_TIMESTAMPS 30
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struct timestamp_event_queue {
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struct ptp_extts_event buf[PTP_MAX_TIMESTAMPS];
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int head;
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int tail;
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spinlock_t lock;
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};
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struct ptp_clock {
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struct posix_clock clock;
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struct device *dev;
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struct ptp_clock_info *info;
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dev_t devid;
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int index; /* index into clocks.map */
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struct pps_device *pps_source;
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long dialed_frequency; /* remembers the frequency adjustment */
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struct timestamp_event_queue tsevq; /* simple fifo for time stamps */
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struct mutex tsevq_mux; /* one process at a time reading the fifo */
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struct mutex pincfg_mux; /* protect concurrent info->pin_config access */
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wait_queue_head_t tsev_wq;
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int defunct; /* tells readers to go away when clock is being removed */
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struct device_attribute *pin_dev_attr;
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struct attribute **pin_attr;
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struct attribute_group pin_attr_group;
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/* 1st entry is a pointer to the real group, 2nd is NULL terminator */
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const struct attribute_group *pin_attr_groups[2];
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struct kthread_worker *kworker;
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struct kthread_delayed_work aux_work;
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};
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/*
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* The function queue_cnt() is safe for readers to call without
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* holding q->lock. Readers use this function to verify that the queue
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* is nonempty before proceeding with a dequeue operation. The fact
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* that a writer might concurrently increment the tail does not
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* matter, since the queue remains nonempty nonetheless.
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*/
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static inline int queue_cnt(struct timestamp_event_queue *q)
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{
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int cnt = q->tail - q->head;
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return cnt < 0 ? PTP_MAX_TIMESTAMPS + cnt : cnt;
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}
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/*
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* see ptp_chardev.c
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*/
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/* caller must hold pincfg_mux */
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int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
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enum ptp_pin_function func, unsigned int chan);
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long ptp_ioctl(struct posix_clock *pc,
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unsigned int cmd, unsigned long arg);
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int ptp_open(struct posix_clock *pc, fmode_t fmode);
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ssize_t ptp_read(struct posix_clock *pc,
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uint flags, char __user *buf, size_t cnt);
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__poll_t ptp_poll(struct posix_clock *pc,
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struct file *fp, poll_table *wait);
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/*
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* see ptp_sysfs.c
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*/
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extern const struct attribute_group *ptp_groups[];
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int ptp_populate_pin_groups(struct ptp_clock *ptp);
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void ptp_cleanup_pin_groups(struct ptp_clock *ptp);
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#endif
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