[PATCH v1 8/9] staging: media: starfive: Add frame sync event for video capture device

[Changhuang Liang <changhuang.liang@starfivetech.com>]

Add frame sync event for video capture device.

Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
---
 .../staging/media/starfive/camss/stf-capture.c    |  9 +++++++++
 drivers/staging/media/starfive/camss/stf-video.c  | 15 +++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/staging/media/starfive/camss/stf-capture.c b/drivers/staging/media/starfive/camss/stf-capture.c
index 6a137a273c8a..d0be769da11b 100644
--- a/drivers/staging/media/starfive/camss/stf-capture.c
+++ b/drivers/staging/media/starfive/camss/stf-capture.c
@@ -7,6 +7,7 @@
  * Copyright (C) 2021-2023 StarFive Technology Co., Ltd.
  */
 
+#include <media/v4l2-event.h>
 #include "stf-camss.h"
 
 static const char * const stf_cap_names[] = {
@@ -430,10 +431,15 @@ static void stf_buf_flush(struct stf_v_buf *output, enum vb2_buffer_state state)
 
 static void stf_buf_done(struct stf_v_buf *output)
 {
+	struct stf_capture *cap = container_of(output, struct stf_capture,
+					       buffers);
 	struct stfcamss_buffer *ready_buf;
 	struct stfcamss *stfcamss = cap->video.stfcamss;
 	u64 ts = ktime_get_ns();
 	unsigned long flags;
+	struct v4l2_event event = {
+		.type = V4L2_EVENT_FRAME_SYNC,
+	};
 
 	if (output->state == STF_OUTPUT_OFF ||
 	    output->state == STF_OUTPUT_RESERVED)
@@ -445,6 +451,9 @@ static void stf_buf_done(struct stf_v_buf *output)
 		if (cap->type == STF_CAPTURE_SCD)
 			stf_isp_fill_yhist(stfcamss, ready_buf->vaddr_sc);
 
+		event.u.frame_sync.frame_sequence = output->sequence;
+		v4l2_event_queue(&cap->video.vdev, &event);
+
 		ready_buf->vb.vb2_buf.timestamp = ts;
 		ready_buf->vb.sequence = output->sequence++;
 
diff --git a/drivers/staging/media/starfive/camss/stf-video.c b/drivers/staging/media/starfive/camss/stf-video.c
index 54d855ba0b57..32381e9ad049 100644
--- a/drivers/staging/media/starfive/camss/stf-video.c
+++ b/drivers/staging/media/starfive/camss/stf-video.c
@@ -507,6 +507,17 @@ static int video_try_fmt(struct file *file, void *fh, struct v4l2_format *f)
 	return __video_try_fmt(video, f);
 }
 
+static int video_subscribe_event(struct v4l2_fh *fh,
+				 const struct v4l2_event_subscription *sub)
+{
+	switch (sub->type) {
+	case V4L2_EVENT_FRAME_SYNC:
+		return v4l2_event_subscribe(fh, sub, 0, NULL);
+	default:
+		return -EINVAL;
+	}
+}
+
 static const struct v4l2_ioctl_ops stf_vid_ioctl_ops = {
 	.vidioc_querycap                = video_querycap,
 	.vidioc_enum_fmt_vid_cap        = video_enum_fmt,
@@ -523,6 +534,8 @@ static const struct v4l2_ioctl_ops stf_vid_ioctl_ops = {
 	.vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
 	.vidioc_streamon                = vb2_ioctl_streamon,
 	.vidioc_streamoff               = vb2_ioctl_streamoff,
+	.vidioc_subscribe_event         = video_subscribe_event,
+	.vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
 };
 
 static int video_scd_g_fmt(struct file *file, void *fh, struct v4l2_format *f)
@@ -554,6 +567,8 @@ static const struct v4l2_ioctl_ops stf_vid_scd_ioctl_ops = {
 	.vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
 	.vidioc_streamon                = vb2_ioctl_streamon,
 	.vidioc_streamoff               = vb2_ioctl_streamoff,
+	.vidioc_subscribe_event         = video_subscribe_event,
+	.vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
 };
 
 /* -----------------------------------------------------------------------------
-- 
2.25.1