950-0304-staging-bcm2835-codec-Add-role-to-device-name.patch

From 434803a4828aed99d5328dd41b4600ef7b0be0ff Mon Sep 17 00:00:00 2001
From: Kieran Bingham <kieran.bingham@ideasonboard.com>
Date: Wed, 20 Mar 2019 11:55:43 +0000
Subject: [PATCH] staging: bcm2835-codec: Add role to device name

Three entities are created, Decode, Encode and ISP but all of the video
nodes use the same video name string "bcm2835-codec" which makes it
difficult to identify each role.

Append the role-name to the video name to facilitate identifying a
specific instance from userspace.

The Card-Type is also extended with the role name to support identifying
the device context from within QUERY_CAP operations.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 .../vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c      | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c
+++ b/drivers/staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c
@@ -947,8 +947,10 @@ static void device_run(void *priv)
 static int vidioc_querycap(struct file *file, void *priv,
 			   struct v4l2_capability *cap)
 {
+	struct bcm2835_codec_dev *dev = video_drvdata(file);
+
 	strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
-	strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
+	strncpy(cap->card, dev->vfd.name, sizeof(cap->card) - 1);
 	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
 		 MEM2MEM_NAME);
 	return 0;
@@ -2657,8 +2659,8 @@ static int bcm2835_codec_create(struct p
 	}
 
 	video_set_drvdata(vfd, dev);
-	snprintf(vfd->name, sizeof(vfd->name), "%s",
-		 bcm2835_codec_videodev.name);
+	snprintf(vfd->name, sizeof(vfd->name), "%s-%s",
+		 bcm2835_codec_videodev.name, roles[role]);
 	v4l2_info(&dev->v4l2_dev, "Device registered as /dev/video%d\n",
 		  vfd->num);