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From:   Alexander Komrakov <alexander.komrakov@broadcom.com>
To:     linux-kernel@vger.kernel.org
Cc:     giometti@enneenne.com, gregkh@linuxfoundation.org,
        Alexander Komrakov <alexander.komrakov@broadcom.com>
Subject: [PATCH v6] pps: Add elapsed realtime timestamping
Date:   Mon, 10 Apr 2023 17:39:53 -0700
Message-Id: <20230411003953.519629-1-alexander.komrakov@broadcom.com>
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Some applications like Android needs elapsed realtime timestamping
to PPS pulse for its clock management. Add sysfs node for this.

Signed-off-by: Alexander Komrakov <alexander.komrakov@broadcom.com>
---
Changes in v6:
  - Removed "staging",wrap changelog text at 72 columns
  - clock_gettime removed, trailing whitespaces removed 
  - <tab> added, extra spaces removed
  - Rename sprintf() to sysfs_emit() 
  - "Real-time assert event" info added to driver-api/pps.rst
  - new entries were moved below the main pps entry
  - Use pps/ppsX/ instead of pps/pps0/

 Documentation/ABI/testing/sysfs-pps | 27 +++++++++++++++++++++++
 Documentation/driver-api/pps.rst    | 19 ++++++++++++++++
 drivers/pps/kapi.c                  | 24 +++++++++++++++++---
 drivers/pps/sysfs.c                 | 34 +++++++++++++++++++++++++++++
 include/linux/pps_kernel.h          |  2 ++
 5 files changed, 103 insertions(+), 3 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-pps b/Documentation/ABI/testing/sysfs-pps
index 25028c7bc37d..ac5051059fc3 100644
--- a/Documentation/ABI/testing/sysfs-pps
+++ b/Documentation/ABI/testing/sysfs-pps
@@ -71,3 +71,30 @@ Description:
 
 		If the source is not connected with any device the content
 		of this file is empty.
+
+What:		/sys/class/pps/ppsX/assert_elapsed
+Date:		October 2021
+Contact:	Alexander Komrakov <alexander.komrakov@broadcom.com>
+Description:
+		The /sys/class/pps/ppsX/assert_elapsed file reports the
+		elapsed real-time assert events and the elapsed
+		real-time assert sequence number of the X-th source
+		in the form:
+
+			<secs>.<nsec>#<sequence>
+
+		If the source has no elapsed real-time assert events
+		the content of this file is empty.
+
+What:		/sys/class/pps/ppsX/clear_elapsed
+Date:		October 2021
+Contact:	Alexander Komrakov <alexander.komrakov@broadcom.com>
+Description:
+		The /sys/class/pps/ppsX/clear_elapsed file reports the elapsed
+		real-time clear events and the elapsed real-time clear
+		sequence number of the X-th source in the form:
+
+			<secs>.<nsec>#<sequence>
+
+		If the source has no elapsed real-time clear events the
+		content of this file is empty.
diff --git a/Documentation/driver-api/pps.rst b/Documentation/driver-api/pps.rst
index 2d6b99766ee8..bd0e63f15f95 100644
--- a/Documentation/driver-api/pps.rst
+++ b/Documentation/driver-api/pps.rst
@@ -167,6 +167,25 @@ sequence number. Other files are:
  * path: reports the PPS source's device path, that is the device the
    PPS source is connected to (if it exists).
 
+Real-time assert event::
+
+   Calculate the monotonic clock from the timespec clock to generate PPS elapsed
+   real-time event value and store the result into /sys/class/pps/pps0/assert_elapsed.
+   Because we have requirements to make sure the delta between standard time,
+   say the GPS Time, and elapsedRealtime < 1 millisecond,
+   regular linux clock timestamp is not enough for our use case.
+   The pin PPS will generate elapsedRealtime event at 1 sec boundary
+   which is an exact value of the monotonic clock from the kernel PPS driver
+   /sys/class/pps/pps0/assert_elapsed.
+   Whenever AP receives this pulse, kernel's pps driver timestamp this
+   elapsedRealtime event and let this time available via sysfs node
+   /sys/class/pps/pps0/assert_elapsed or the IOCTL call.
+
+   The device's Unix epoch time system clock is not monotonic; it can jump forwards
+   or backwards unpredictably and may be changed at any time by the user,
+   so this time should not be used to order or compare locations.
+   Prefer for that purpose, as the elapsed realtime clock is guaranteed to be monotonic.
+
 
 Testing the PPS support
 -----------------------
diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c
index d9d566f70ed1..1f3ddccf9642 100644
--- a/drivers/pps/kapi.c
+++ b/drivers/pps/kapi.c
@@ -162,11 +162,21 @@ void pps_event(struct pps_device *pps, struct pps_event_time *ts, int event,
 	unsigned long flags;
 	int captured = 0;
 	struct pps_ktime ts_real = { .sec = 0, .nsec = 0, .flags = 0 };
+	struct pps_ktime ts_real_elapsed = { .sec = 0, .nsec = 0, .flags = 0 };
+	struct timespec64 ts64 = { .tv_sec = 0, .tv_nsec = 0 };
 
 	/* check event type */
 	BUG_ON((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) == 0);
 
-	dev_dbg(pps->dev, "PPS event at %lld.%09ld\n",
+	/* Calculate the monotonic clock from the timespec clock and stores the result in pps_ktime format
+	   ktime_get_boottime_ts64() : because elapsed realtime includes time spent in sleep */
+	ktime_get_boottime_ts64(&ts64);
+	timespec_to_pps_ktime(&ts_real_elapsed,ts64);
+
+	dev_dbg(pps->dev, "PPS event (monotonic) at %lld.%09d\n",
+			(s64)ts_real_elapsed.sec, ts_real_elapsed.nsec);
+
+	dev_dbg(pps->dev, "PPS event (timestamp) at %lld.%09ld\n",
 			(s64)ts->ts_real.tv_sec, ts->ts_real.tv_nsec);
 
 	timespec_to_pps_ktime(&ts_real, ts->ts_real);
@@ -181,11 +191,15 @@ void pps_event(struct pps_device *pps, struct pps_event_time *ts, int event,
 	pps->current_mode = pps->params.mode;
 	if (event & pps->params.mode & PPS_CAPTUREASSERT) {
 		/* We have to add an offset? */
-		if (pps->params.mode & PPS_OFFSETASSERT)
+		if (pps->params.mode & PPS_OFFSETASSERT) {
+			pps_add_offset(&ts_real_elapsed,
+					&pps->params.assert_off_tu);
 			pps_add_offset(&ts_real,
 					&pps->params.assert_off_tu);
+		}
 
 		/* Save the time stamp */
+		pps->assert_elapsed_tu = ts_real_elapsed;
 		pps->assert_tu = ts_real;
 		pps->assert_sequence++;
 		dev_dbg(pps->dev, "capture assert seq #%u\n",
@@ -195,11 +209,15 @@ void pps_event(struct pps_device *pps, struct pps_event_time *ts, int event,
 	}
 	if (event & pps->params.mode & PPS_CAPTURECLEAR) {
 		/* We have to add an offset? */
-		if (pps->params.mode & PPS_OFFSETCLEAR)
+		if (pps->params.mode & PPS_OFFSETCLEAR)	{
+			pps_add_offset(&ts_real_elapsed,
+					&pps->params.clear_off_tu);
 			pps_add_offset(&ts_real,
 					&pps->params.clear_off_tu);
+		}
 
 		/* Save the time stamp */
+		pps->clear_elapsed_tu = ts_real_elapsed;
 		pps->clear_tu = ts_real;
 		pps->clear_sequence++;
 		dev_dbg(pps->dev, "capture clear seq #%u\n",
diff --git a/drivers/pps/sysfs.c b/drivers/pps/sysfs.c
index 134bc33f6ad0..983f16b86a62 100644
--- a/drivers/pps/sysfs.c
+++ b/drivers/pps/sysfs.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/pps_kernel.h>
+#include <linux/sysfs.h>
 
 /*
  * Attribute functions
@@ -29,6 +30,21 @@ static ssize_t assert_show(struct device *dev, struct device_attribute *attr,
 }
 static DEVICE_ATTR_RO(assert);
 
+static ssize_t assert_elapsed_show(struct device *dev,
+			   struct device_attribute *attr, char *buf)
+{
+	struct pps_device *pps = dev_get_drvdata(dev);
+
+	if (!(pps->info.mode & PPS_CAPTUREASSERT))
+		return 0;
+
+	return sysfs_emit(buf, "%lld.%09d#%d\n",
+			   (long long) pps->assert_elapsed_tu.sec,
+			   pps->assert_elapsed_tu.nsec,
+			   pps->assert_sequence);
+}
+static DEVICE_ATTR_RO(assert_elapsed);
+
 static ssize_t clear_show(struct device *dev, struct device_attribute *attr,
 			  char *buf)
 {
@@ -43,6 +59,22 @@ static ssize_t clear_show(struct device *dev, struct device_attribute *attr,
 }
 static DEVICE_ATTR_RO(clear);
 
+static ssize_t clear_elapsed_show(struct device *dev,
+			  struct device_attribute *attr,
+			  char *buf)
+{
+	struct pps_device *pps = dev_get_drvdata(dev);
+
+	if (!(pps->info.mode & PPS_CAPTURECLEAR))
+		return 0;
+
+	return sysfs_emit(buf, "%lld.%09d#%d\n",
+			(long long) pps->clear_elapsed_tu.sec,
+			pps->clear_elapsed_tu.nsec,
+			pps->clear_sequence);
+}
+static DEVICE_ATTR_RO(clear_elapsed);
+
 static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
@@ -82,6 +114,8 @@ static DEVICE_ATTR_RO(path);
 static struct attribute *pps_attrs[] = {
 	&dev_attr_assert.attr,
 	&dev_attr_clear.attr,
+	&dev_attr_assert_elapsed.attr,
+	&dev_attr_clear_elapsed.attr,
 	&dev_attr_mode.attr,
 	&dev_attr_echo.attr,
 	&dev_attr_name.attr,
diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h
index 78c8ac4951b5..807642da12f7 100644
--- a/include/linux/pps_kernel.h
+++ b/include/linux/pps_kernel.h
@@ -47,6 +47,8 @@ struct pps_device {
 
 	__u32 assert_sequence;			/* PPS assert event seq # */
 	__u32 clear_sequence;			/* PPS clear event seq # */
+	struct pps_ktime assert_elapsed_tu;	/* PPS elapsed rt assert seq # */
+	struct pps_ktime clear_elapsed_tu;	/* PPS elapsed rt clear event seq */
 	struct pps_ktime assert_tu;
 	struct pps_ktime clear_tu;
 	int current_mode;			/* PPS mode at event time */
-- 
2.25.1


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