media: ti-vpe: cal: Register a media device

Enable the media controller API by registering a media device and
initializing the media entities corresponding to the video devices. The
context initialization is slightly refactored as a result. The media
graph will be built in a subsequent change.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/ti-vpe/cal.c

@@ -22,6 +22,7 @@
 #include <linux/slab.h>
 #include <linux/videodev2.h>
 
+#include <media/media-device.h>
 #include <media/v4l2-async.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-ctrls.h>
@@ -282,6 +283,7 @@ struct cal_dev {
 	struct device		*dev;
 
 	const struct cal_data	*data;
+	u32			revision;
 
 	/* Control Module handle */
 	struct regmap		*syscon_camerrx;
@@ -292,6 +294,7 @@ struct cal_dev {
 
 	struct cal_ctx		*ctx[CAL_NUM_CONTEXT];
 
+	struct media_device	mdev;
 	struct v4l2_device	v4l2_dev;
 	struct v4l2_async_notifier notifier;
 };
@@ -302,6 +305,7 @@ struct cal_dev {
 struct cal_ctx {
 	struct v4l2_ctrl_handler ctrl_handler;
 	struct video_device	vdev;
+	struct media_pad	pad;
 
 	struct cal_dev		*cal;
 	struct cal_camerarx	*phy;
@@ -2050,11 +2054,11 @@ static int cal_ctx_v4l2_init(struct cal_ctx *ctx)
 	struct vb2_queue *q = &ctx->vb_vidq;
 	int ret;
 
-	/* initialize locks */
+	INIT_LIST_HEAD(&ctx->vidq.active);
 	spin_lock_init(&ctx->slock);
 	mutex_init(&ctx->mutex);
 
-	/* initialize queue */
+	/* Initialize the vb2 queue. */
 	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 	q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_READ;
 	q->drv_priv = ctx;
@@ -2070,35 +2074,39 @@ static int cal_ctx_v4l2_init(struct cal_ctx *ctx)
 	if (ret)
 		return ret;
 
-	/* init video dma queues */
-	INIT_LIST_HEAD(&ctx->vidq.active);
-
+	/* Initialize the video device and media entity. */
 	*vfd = cal_videodev;
 	vfd->v4l2_dev = &ctx->cal->v4l2_dev;
 	vfd->queue = q;
+	snprintf(vfd->name, sizeof(vfd->name), "CAL output %u", ctx->index);
+	vfd->lock = &ctx->mutex;
+	video_set_drvdata(vfd, ctx);
+
+	ctx->pad.flags = MEDIA_PAD_FL_SINK;
+	ret = media_entity_pads_init(&vfd->entity, 1, &ctx->pad);
+	if (ret < 0)
+		return ret;
 
 	/* Initialize the control handler. */
 	ret = v4l2_ctrl_handler_init(hdl, 11);
 	if (ret < 0) {
 		ctx_err(ctx, "Failed to init ctrl handler\n");
-		return ret;
+		goto error;
 	}
 
 	vfd->ctrl_handler = hdl;
 
-	/*
-	 * Provide a mutex to v4l2 core. It will be used to protect
-	 * all fops and v4l2 ioctls.
-	 */
-	vfd->lock = &ctx->mutex;
-	video_set_drvdata(vfd, ctx);
-
 	return 0;
+
+error:
+	media_entity_cleanup(&vfd->entity);
+	return ret;
 }
 
 static void cal_ctx_v4l2_cleanup(struct cal_ctx *ctx)
 {
 	v4l2_ctrl_handler_free(&ctx->ctrl_handler);
+	media_entity_cleanup(&ctx->vdev.entity);
 }
 
 /* ------------------------------------------------------------------
@@ -2225,13 +2233,21 @@ static int cal_media_register(struct cal_dev *cal)
 {
 	int ret;
 
+	ret = media_device_register(&cal->mdev);
+	if (ret) {
+		cal_err(cal, "Failed to register media device\n");
+		return ret;
+	}
+
 	/*
 	 * Register the async notifier. This may trigger registration of the
 	 * V4L2 video devices if all subdevs are ready.
 	 */
 	ret = cal_async_notifier_register(cal);
-	if (ret)
+	if (ret) {
+		media_device_unregister(&cal->mdev);
 		return ret;
+	}
 
 	return 0;
 }
@@ -2251,6 +2267,7 @@ static void cal_media_unregister(struct cal_dev *cal)
 	}
 
 	cal_async_notifier_unregister(cal);
+	media_device_unregister(&cal->mdev);
 }
 
 /*
@@ -2259,12 +2276,21 @@ static void cal_media_unregister(struct cal_dev *cal)
  */
 static int cal_media_init(struct cal_dev *cal)
 {
+	struct media_device *mdev = &cal->mdev;
 	int ret;
 
+	mdev->dev = cal->dev;
+	mdev->hw_revision = cal->revision;
+	strscpy(mdev->model, "CAL", sizeof(mdev->model));
+	snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
+		 dev_name(mdev->dev));
+	media_device_init(mdev);
+
 	/*
 	 * Initialize the V4L2 device (despite the function name, this performs
 	 * initialization, not registration).
 	 */
+	cal->v4l2_dev.mdev = mdev;
 	ret = v4l2_device_register(cal->dev, &cal->v4l2_dev);
 	if (ret) {
 		cal_err(cal, "Failed to register V4L2 device\n");
@@ -2291,6 +2317,8 @@ static void cal_media_cleanup(struct cal_dev *cal)
 	}
 
 	v4l2_device_unregister(&cal->v4l2_dev);
+	media_device_cleanup(&cal->mdev);
+
 	vb2_dma_contig_clear_max_seg_size(cal->dev);
 }
 
@@ -2347,23 +2375,22 @@ MODULE_DEVICE_TABLE(of, cal_of_match);
 
 static void cal_get_hwinfo(struct cal_dev *cal)
 {
-	u32 revision;
 	u32 hwinfo;
 
-	revision = reg_read(cal, CAL_HL_REVISION);
-	switch (FIELD_GET(CAL_HL_REVISION_SCHEME_MASK, revision)) {
+	cal->revision = reg_read(cal, CAL_HL_REVISION);
+	switch (FIELD_GET(CAL_HL_REVISION_SCHEME_MASK, cal->revision)) {
 	case CAL_HL_REVISION_SCHEME_H08:
 		cal_dbg(3, cal, "CAL HW revision %lu.%lu.%lu (0x%08x)\n",
-			FIELD_GET(CAL_HL_REVISION_MAJOR_MASK, revision),
-			FIELD_GET(CAL_HL_REVISION_MINOR_MASK, revision),
-			FIELD_GET(CAL_HL_REVISION_RTL_MASK, revision),
-			revision);
+			FIELD_GET(CAL_HL_REVISION_MAJOR_MASK, cal->revision),
+			FIELD_GET(CAL_HL_REVISION_MINOR_MASK, cal->revision),
+			FIELD_GET(CAL_HL_REVISION_RTL_MASK, cal->revision),
+			cal->revision);
 		break;
 
 	case CAL_HL_REVISION_SCHEME_LEGACY:
 	default:
 		cal_info(cal, "Unexpected CAL HW revision 0x%08x\n",
-			 revision);
+			 cal->revision);
 		break;
 	}