1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * PTP 1588 clock support - private declarations for the core module. 4 * 5 * Copyright (C) 2010 OMICRON electronics GmbH 6 */ 7 #ifndef _PTP_PRIVATE_H_ 8 #define _PTP_PRIVATE_H_ 9 10 #include <linux/cdev.h> 11 #include <linux/device.h> 12 #include <linux/kthread.h> 13 #include <linux/mutex.h> 14 #include <linux/posix-clock.h> 15 #include <linux/ptp_clock.h> 16 #include <linux/ptp_clock_kernel.h> 17 #include <linux/time.h> 18 19 #define PTP_MAX_TIMESTAMPS 128 20 #define PTP_BUF_TIMESTAMPS 30 21 22 struct timestamp_event_queue { 23 struct ptp_extts_event buf[PTP_MAX_TIMESTAMPS]; 24 int head; 25 int tail; 26 spinlock_t lock; 27 }; 28 29 struct ptp_clock { 30 struct posix_clock clock; 31 struct device dev; 32 struct ptp_clock_info *info; 33 dev_t devid; 34 int index; /* index into clocks.map */ 35 struct pps_device *pps_source; 36 long dialed_frequency; /* remembers the frequency adjustment */ 37 struct timestamp_event_queue tsevq; /* simple fifo for time stamps */ 38 struct mutex tsevq_mux; /* one process at a time reading the fifo */ 39 struct mutex pincfg_mux; /* protect concurrent info->pin_config access */ 40 wait_queue_head_t tsev_wq; 41 int defunct; /* tells readers to go away when clock is being removed */ 42 struct device_attribute *pin_dev_attr; 43 struct attribute **pin_attr; 44 struct attribute_group pin_attr_group; 45 /* 1st entry is a pointer to the real group, 2nd is NULL terminator */ 46 const struct attribute_group *pin_attr_groups[2]; 47 struct kthread_worker *kworker; 48 struct kthread_delayed_work aux_work; 49 }; 50 51 /* 52 * The function queue_cnt() is safe for readers to call without 53 * holding q->lock. Readers use this function to verify that the queue 54 * is nonempty before proceeding with a dequeue operation. The fact 55 * that a writer might concurrently increment the tail does not 56 * matter, since the queue remains nonempty nonetheless. 57 */ 58 static inline int queue_cnt(struct timestamp_event_queue *q) 59 { 60 int cnt = q->tail - q->head; 61 return cnt < 0 ? PTP_MAX_TIMESTAMPS + cnt : cnt; 62 } 63 64 /* 65 * see ptp_chardev.c 66 */ 67 68 /* caller must hold pincfg_mux */ 69 int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin, 70 enum ptp_pin_function func, unsigned int chan); 71 72 long ptp_ioctl(struct posix_clock *pc, 73 unsigned int cmd, unsigned long arg); 74 75 int ptp_open(struct posix_clock *pc, fmode_t fmode); 76 77 ssize_t ptp_read(struct posix_clock *pc, 78 uint flags, char __user *buf, size_t cnt); 79 80 __poll_t ptp_poll(struct posix_clock *pc, 81 struct file *fp, poll_table *wait); 82 83 /* 84 * see ptp_sysfs.c 85 */ 86 87 extern const struct attribute_group *ptp_groups[]; 88 89 int ptp_populate_pin_groups(struct ptp_clock *ptp); 90 void ptp_cleanup_pin_groups(struct ptp_clock *ptp); 91 92 #endif 93