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- /*
- * PTP 1588 clock support - private declarations for the core module.
- *
- * 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 _PTP_PRIVATE_H_
- #define _PTP_PRIVATE_H_
- #include <linux/cdev.h>
- #include <linux/device.h>
- #include <linux/mutex.h>
- #include <linux/posix-clock.h>
- #include <linux/ptp_clock.h>
- #include <linux/ptp_clock_kernel.h>
- #include <linux/time.h>
- #define PTP_MAX_TIMESTAMPS 128
- #define PTP_BUF_TIMESTAMPS 30
- struct timestamp_event_queue {
- struct ptp_extts_event buf[PTP_MAX_TIMESTAMPS];
- int head;
- int tail;
- spinlock_t lock;
- };
- struct ptp_clock {
- struct posix_clock clock;
- struct device *dev;
- struct ptp_clock_info *info;
- dev_t devid;
- int index; /* index into clocks.map */
- struct pps_device *pps_source;
- long dialed_frequency; /* remembers the frequency adjustment */
- struct timestamp_event_queue tsevq; /* simple fifo for time stamps */
- struct mutex tsevq_mux; /* one process at a time reading the fifo */
- struct mutex pincfg_mux; /* protect concurrent info->pin_config access */
- wait_queue_head_t tsev_wq;
- int defunct; /* tells readers to go away when clock is being removed */
- struct device_attribute *pin_dev_attr;
- struct attribute **pin_attr;
- struct attribute_group pin_attr_group;
- };
- /*
- * The function queue_cnt() is safe for readers to call without
- * holding q->lock. Readers use this function to verify that the queue
- * is nonempty before proceeding with a dequeue operation. The fact
- * that a writer might concurrently increment the tail does not
- * matter, since the queue remains nonempty nonetheless.
- */
- static inline int queue_cnt(struct timestamp_event_queue *q)
- {
- int cnt = q->tail - q->head;
- return cnt < 0 ? PTP_MAX_TIMESTAMPS + cnt : cnt;
- }
- /*
- * see ptp_chardev.c
- */
- /* caller must hold pincfg_mux */
- int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
- enum ptp_pin_function func, unsigned int chan);
- long ptp_ioctl(struct posix_clock *pc,
- unsigned int cmd, unsigned long arg);
- int ptp_open(struct posix_clock *pc, fmode_t fmode);
- ssize_t ptp_read(struct posix_clock *pc,
- uint flags, char __user *buf, size_t cnt);
- uint ptp_poll(struct posix_clock *pc,
- struct file *fp, poll_table *wait);
- /*
- * see ptp_sysfs.c
- */
- extern const struct attribute_group *ptp_groups[];
- int ptp_cleanup_sysfs(struct ptp_clock *ptp);
- int ptp_populate_sysfs(struct ptp_clock *ptp);
- #endif
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