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92 lines
2.6 KiB
92 lines
2.6 KiB
/* 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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