V4L/DVB (5306): Add support for VIDIOC_G_CHIP_IDENT

VIDIOC_G_CHIP_IDENT improves debugging of card problems: it can be
used to detect which chips are on the board and based on that information
selected register dumps can be made, making it easy to debug complicated
media chips containing tens or hundreds of registers.
This ioctl replaces the internal VIDIOC_INT_G_CHIP_IDENT ioctl.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/media/video/videodev.c b/drivers/media/video/videodev.c
index 5c9f2116d7b..fdfef0b5331 100644
--- a/drivers/media/video/videodev.c
+++ b/drivers/media/video/videodev.c
@@ -1532,6 +1532,16 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
                 break;
         }
 #endif
+        case VIDIOC_G_CHIP_IDENT:
+        {
+                struct v4l2_chip_ident *p=arg;
+                if (!vfd->vidioc_g_chip_ident)
+                        break;
+                ret=vfd->vidioc_g_chip_ident(file, fh, p);
+                if (!ret)
+                        dbgarg (cmd, "chip_ident=%u, revision=0x%x\n", p->ident, p->revision);
+                break;
+        }
         } /* switch */
 
         if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {