[PATCH v3 15/29] media: iris: implement subscribe_event and unsubscribe_event ioctls

[Dikshita Agarwal via B4 Relay <devnull+quic_dikshita.quicinc.com@kernel.org>]

From: Vedang Nagar <quic_vnagar@quicinc.com>

Implement subscribe_event and unsubscribe_event ioctls in the
driver with necessary hooks.

Signed-off-by: Vedang Nagar <quic_vnagar@quicinc.com>
Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
---
 drivers/media/platform/qcom/iris/iris_instance.h |  2 ++
 drivers/media/platform/qcom/iris/iris_vdec.c     | 26 ++++++++++++++++++++
 drivers/media/platform/qcom/iris/iris_vdec.h     |  1 +
 drivers/media/platform/qcom/iris/iris_vidc.c     | 31 ++++++++++++++++++++++++
 4 files changed, 60 insertions(+)

diff --git a/drivers/media/platform/qcom/iris/iris_instance.h b/drivers/media/platform/qcom/iris/iris_instance.h
index bb43119af352..d28b8fd7ec2f 100644
--- a/drivers/media/platform/qcom/iris/iris_instance.h
+++ b/drivers/media/platform/qcom/iris/iris_instance.h
@@ -30,6 +30,7 @@
  * @once_per_session_set: boolean to set once per session property
  * @m2m_dev:	a reference to m2m device structure
  * @m2m_ctx:	a reference to m2m context structure
+ * @subscriptions: variable to hold current events subscriptions
  */
 
 struct iris_inst {
@@ -48,6 +49,7 @@ struct iris_inst {
 	bool				once_per_session_set;
 	struct v4l2_m2m_dev		*m2m_dev;
 	struct v4l2_m2m_ctx		*m2m_ctx;
+	unsigned int			subscriptions;
 };
 
 #endif
diff --git a/drivers/media/platform/qcom/iris/iris_vdec.c b/drivers/media/platform/qcom/iris/iris_vdec.c
index a38903eefa1c..29c7e229c148 100644
--- a/drivers/media/platform/qcom/iris/iris_vdec.c
+++ b/drivers/media/platform/qcom/iris/iris_vdec.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
+#include <media/v4l2-event.h>
 #include <media/v4l2-mem2mem.h>
 
 #include "iris_buffer.h"
@@ -13,6 +14,7 @@
 #define DEFAULT_WIDTH 320
 #define DEFAULT_HEIGHT 240
 #define DEFAULT_CODEC_ALIGNMENT 16
+#define MAX_EVENTS 30
 
 void iris_vdec_inst_init(struct iris_inst *inst)
 {
@@ -207,3 +209,27 @@ int iris_vdec_s_fmt(struct iris_inst *inst, struct v4l2_format *f)
 
 	return ret;
 }
+
+int iris_vdec_subscribe_event(struct iris_inst *inst, const struct v4l2_event_subscription *sub)
+{
+	int ret = 0;
+
+	switch (sub->type) {
+	case V4L2_EVENT_EOS:
+		ret = v4l2_event_subscribe(&inst->fh, sub, MAX_EVENTS, NULL);
+		inst->subscriptions |= V4L2_EVENT_EOS;
+		break;
+	case V4L2_EVENT_SOURCE_CHANGE:
+		ret = v4l2_src_change_event_subscribe(&inst->fh, sub);
+		inst->subscriptions |= V4L2_EVENT_SOURCE_CHANGE;
+		break;
+	case V4L2_EVENT_CTRL:
+		ret = v4l2_ctrl_subscribe_event(&inst->fh, sub);
+		inst->subscriptions |= V4L2_EVENT_CTRL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return ret;
+}
diff --git a/drivers/media/platform/qcom/iris/iris_vdec.h b/drivers/media/platform/qcom/iris/iris_vdec.h
index eb8a1121ae92..707fff34bf4d 100644
--- a/drivers/media/platform/qcom/iris/iris_vdec.h
+++ b/drivers/media/platform/qcom/iris/iris_vdec.h
@@ -13,5 +13,6 @@ void iris_vdec_inst_deinit(struct iris_inst *inst);
 int iris_vdec_enum_fmt(struct iris_inst *inst, struct v4l2_fmtdesc *f);
 int iris_vdec_try_fmt(struct iris_inst *inst, struct v4l2_format *f);
 int iris_vdec_s_fmt(struct iris_inst *inst, struct v4l2_format *f);
+int iris_vdec_subscribe_event(struct iris_inst *inst, const struct v4l2_event_subscription *sub);
 
 #endif
diff --git a/drivers/media/platform/qcom/iris/iris_vidc.c b/drivers/media/platform/qcom/iris/iris_vidc.c
index 488be6afd999..141704512b3c 100644
--- a/drivers/media/platform/qcom/iris/iris_vidc.c
+++ b/drivers/media/platform/qcom/iris/iris_vidc.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/pm_runtime.h>
+#include <media/v4l2-event.h>
 #include <media/v4l2-ioctl.h>
 #include <media/v4l2-mem2mem.h>
 
@@ -402,6 +403,34 @@ static int iris_g_selection(struct file *filp, void *fh, struct v4l2_selection *
 	return ret;
 }
 
+static int iris_subscribe_event(struct v4l2_fh *fh, const struct v4l2_event_subscription *sub)
+{
+	struct iris_inst *inst;
+	int ret;
+
+	inst = container_of(fh, struct iris_inst, fh);
+
+	mutex_lock(&inst->lock);
+	ret = iris_vdec_subscribe_event(inst, sub);
+	mutex_unlock(&inst->lock);
+
+	return ret;
+}
+
+static int iris_unsubscribe_event(struct v4l2_fh *fh, const struct v4l2_event_subscription *sub)
+{
+	struct iris_inst *inst;
+	int ret;
+
+	inst = container_of(fh, struct iris_inst, fh);
+
+	mutex_lock(&inst->lock);
+	ret = v4l2_event_unsubscribe(&inst->fh, sub);
+	mutex_unlock(&inst->lock);
+
+	return ret;
+}
+
 static struct v4l2_file_operations iris_v4l2_file_ops = {
 	.owner                          = THIS_MODULE,
 	.open                           = iris_open,
@@ -427,6 +456,8 @@ static const struct v4l2_ioctl_ops iris_v4l2_ioctl_ops = {
 	.vidioc_enum_framesizes         = iris_enum_framesizes,
 	.vidioc_reqbufs                 = v4l2_m2m_ioctl_reqbufs,
 	.vidioc_g_selection             = iris_g_selection,
+	.vidioc_subscribe_event         = iris_subscribe_event,
+	.vidioc_unsubscribe_event       = iris_unsubscribe_event,
 };
 
 void iris_init_ops(struct iris_core *core)

-- 
2.34.1