[libcamera-devel] [PATCH 05/15] v4l2: v4l2_camera_proxy: Implement VIDIOC_ENUMINPUT, VIDIOC_G/S_INPUT

[Paul Elder]

Implement VIDIOC_ENUMINPUT, VIDIOC_G_INPUT, and VIDIOC_S_INPUT. Only the
zeroth input device is supported, and the info returned by enuminput is
hardcoded and basic. This is sufficient to pass v4l2-compliance.

Signed-off-by: Paul Elder <paul.elder at ideasonboard.com>
---
 src/v4l2/v4l2_camera_proxy.cpp | 54 ++++++++++++++++++++++++++++++++++
 src/v4l2/v4l2_camera_proxy.h   |  3 ++
 2 files changed, 57 insertions(+)

diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp
index f268f7a..6c0dacc 100644
--- a/src/v4l2/v4l2_camera_proxy.cpp
+++ b/src/v4l2/v4l2_camera_proxy.cpp
@@ -397,6 +397,51 @@ int V4L2CameraProxy::vidioc_s_priority(int fd, enum v4l2_priority *arg)
 	return 0;
 }
 
+int V4L2CameraProxy::vidioc_enuminput(int fd, struct v4l2_input *arg)
+{
+	LOG(V4L2Compat, Debug) << "Servicing vidioc_enuminput fd = " << fd;
+
+	if (arg == nullptr)
+		return -EFAULT;
+
+	if (arg->index != 0)
+		return -EINVAL;
+
+	memset(arg, 0, sizeof(*arg));
+
+	utils::strlcpy(reinterpret_cast<char *>(arg->name),
+		       reinterpret_cast<char *>(capabilities_.card),
+		       sizeof(arg->name));
+	arg->type = V4L2_INPUT_TYPE_CAMERA;
+
+	return 0;
+}
+
+int V4L2CameraProxy::vidioc_g_input(int fd, int *arg)
+{
+	LOG(V4L2Compat, Debug) << "Servicing vidioc_g_input fd = " << fd;
+
+	if (arg == nullptr)
+		return -EFAULT;
+
+	*arg = 0;
+
+	return 0;
+}
+
+int V4L2CameraProxy::vidioc_s_input(int fd, int *arg)
+{
+	LOG(V4L2Compat, Debug) << "Servicing vidioc_s_input fd = " << fd;
+
+	if (arg == nullptr)
+		return -EFAULT;
+
+	if (*arg != 0)
+		return -EINVAL;
+
+	return 0;
+}
+
 int V4L2CameraProxy::freeBuffers()
 {
 	LOG(V4L2Compat, Debug) << "Freeing libcamera bufs";
@@ -649,6 +694,15 @@ int V4L2CameraProxy::ioctl(int fd, unsigned long request, void *arg)
 	case VIDIOC_S_PRIORITY:
 		ret = vidioc_s_priority(fd, static_cast<enum v4l2_priority *>(arg));
 		break;
+	case VIDIOC_ENUMINPUT:
+		ret = vidioc_enuminput(fd, static_cast<struct v4l2_input *>(arg));
+		break;
+	case VIDIOC_G_INPUT:
+		ret = vidioc_g_input(fd, static_cast<int *>(arg));
+		break;
+	case VIDIOC_S_INPUT:
+		ret = vidioc_s_input(fd, static_cast<int *>(arg));
+		break;
 	case VIDIOC_REQBUFS:
 		ret = vidioc_reqbufs(fd, static_cast<struct v4l2_requestbuffers *>(arg));
 		break;
diff --git a/src/v4l2/v4l2_camera_proxy.h b/src/v4l2/v4l2_camera_proxy.h
index a0c373d..2e90bfd 100644
--- a/src/v4l2/v4l2_camera_proxy.h
+++ b/src/v4l2/v4l2_camera_proxy.h
@@ -51,6 +51,9 @@ private:
 	int vidioc_try_fmt(int fd, struct v4l2_format *arg);
 	int vidioc_g_priority(int fd, enum v4l2_priority *arg);
 	int vidioc_s_priority(int fd, enum v4l2_priority *arg);
+	int vidioc_enuminput(int fd, struct v4l2_input *arg);
+	int vidioc_g_input(int fd, int *arg);
+	int vidioc_s_input(int fd, int *arg);
 	int vidioc_reqbufs(int fd, struct v4l2_requestbuffers *arg);
 	int vidioc_querybuf(int fd, struct v4l2_buffer *arg);
 	int vidioc_qbuf(int fd, struct v4l2_buffer *arg);
-- 
2.27.0