v4.19.13 snapshot.
diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h
new file mode 100644
index 0000000..80a980c
--- /dev/null
+++ b/include/linux/pps_kernel.h
@@ -0,0 +1,133 @@
+/*
+ * PPS API kernel header
+ *
+ * Copyright (C) 2009 Rodolfo Giometti <giometti@linux.it>
+ *
+ * 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 LINUX_PPS_KERNEL_H
+#define LINUX_PPS_KERNEL_H
+
+#include <linux/pps.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/time.h>
+
+/*
+ * Global defines
+ */
+
+struct pps_device;
+
+/* The specific PPS source info */
+struct pps_source_info {
+ char name[PPS_MAX_NAME_LEN]; /* symbolic name */
+ char path[PPS_MAX_NAME_LEN]; /* path of connected device */
+ int mode; /* PPS allowed mode */
+
+ void (*echo)(struct pps_device *pps,
+ int event, void *data); /* PPS echo function */
+
+ struct module *owner;
+ struct device *dev; /* Parent device for device_create */
+};
+
+struct pps_event_time {
+#ifdef CONFIG_NTP_PPS
+ struct timespec64 ts_raw;
+#endif /* CONFIG_NTP_PPS */
+ struct timespec64 ts_real;
+};
+
+/* The main struct */
+struct pps_device {
+ struct pps_source_info info; /* PSS source info */
+
+ struct pps_kparams params; /* PPS current params */
+
+ __u32 assert_sequence; /* PPS assert event seq # */
+ __u32 clear_sequence; /* PPS clear event seq # */
+ struct pps_ktime assert_tu;
+ struct pps_ktime clear_tu;
+ int current_mode; /* PPS mode at event time */
+
+ unsigned int last_ev; /* last PPS event id */
+ wait_queue_head_t queue; /* PPS event queue */
+
+ unsigned int id; /* PPS source unique ID */
+ void const *lookup_cookie; /* For pps_lookup_dev() only */
+ struct cdev cdev;
+ struct device *dev;
+ struct fasync_struct *async_queue; /* fasync method */
+ spinlock_t lock;
+};
+
+/*
+ * Global variables
+ */
+
+extern const struct attribute_group *pps_groups[];
+
+/*
+ * Internal functions.
+ *
+ * These are not actually part of the exported API, but this is a
+ * convenient header file to put them in.
+ */
+
+extern int pps_register_cdev(struct pps_device *pps);
+extern void pps_unregister_cdev(struct pps_device *pps);
+
+/*
+ * Exported functions
+ */
+
+extern struct pps_device *pps_register_source(
+ struct pps_source_info *info, int default_params);
+extern void pps_unregister_source(struct pps_device *pps);
+extern void pps_event(struct pps_device *pps,
+ struct pps_event_time *ts, int event, void *data);
+/* Look up a pps_device by magic cookie */
+struct pps_device *pps_lookup_dev(void const *cookie);
+
+static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
+ struct timespec64 ts)
+{
+ kt->sec = ts.tv_sec;
+ kt->nsec = ts.tv_nsec;
+}
+
+static inline void pps_get_ts(struct pps_event_time *ts)
+{
+ struct system_time_snapshot snap;
+
+ ktime_get_snapshot(&snap);
+ ts->ts_real = ktime_to_timespec64(snap.real);
+#ifdef CONFIG_NTP_PPS
+ ts->ts_raw = ktime_to_timespec64(snap.raw);
+#endif
+}
+
+/* Subtract known time delay from PPS event time(s) */
+static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec64 delta)
+{
+ ts->ts_real = timespec64_sub(ts->ts_real, delta);
+#ifdef CONFIG_NTP_PPS
+ ts->ts_raw = timespec64_sub(ts->ts_raw, delta);
+#endif
+}
+
+#endif /* LINUX_PPS_KERNEL_H */