[libcamera-devel] [PATCH v3 10/22] 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>
Reviewed-by: Jacopo Mondi <jacopo at jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>

---
Changes in v3:
- cosmetic changes

Changes in v2:
- use V4L2CameraFile instead of fd
- remove arg == nullptr check as it has been moved away to the main
  ioctl handler
---
 src/v4l2/v4l2_camera_proxy.cpp | 48 ++++++++++++++++++++++++++++++++++
 src/v4l2/v4l2_camera_proxy.h   |  3 +++
 2 files changed, 51 insertions(+)

diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp
index 361abe4..7925ed1 100644
--- a/src/v4l2/v4l2_camera_proxy.cpp
+++ b/src/v4l2/v4l2_camera_proxy.cpp
@@ -382,6 +382,42 @@ int V4L2CameraProxy::vidioc_s_priority(V4L2CameraFile *file, enum v4l2_priority
 	return 0;
 }
 
+int V4L2CameraProxy::vidioc_enuminput(V4L2CameraFile *file, struct v4l2_input *arg)
+{
+	LOG(V4L2Compat, Debug) << "Servicing vidioc_enuminput fd = " << file->efd();
+
+	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(V4L2CameraFile *file, int *arg)
+{
+	LOG(V4L2Compat, Debug) << "Servicing vidioc_g_input fd = " << file->efd();
+
+	*arg = 0;
+
+	return 0;
+}
+
+int V4L2CameraProxy::vidioc_s_input(V4L2CameraFile *file, int *arg)
+{
+	LOG(V4L2Compat, Debug) << "Servicing vidioc_s_input fd = " << file->efd();
+
+	if (*arg != 0)
+		return -EINVAL;
+
+	return 0;
+}
+
 int V4L2CameraProxy::freeBuffers()
 {
 	LOG(V4L2Compat, Debug) << "Freeing libcamera bufs";
@@ -601,6 +637,9 @@ const std::set<unsigned long> V4L2CameraProxy::supportedIoctls_ = {
 	VIDIOC_TRY_FMT,
 	VIDIOC_G_PRIORITY,
 	VIDIOC_S_PRIORITY,
+	VIDIOC_ENUMINPUT,
+	VIDIOC_G_INPUT,
+	VIDIOC_S_INPUT,
 	VIDIOC_REQBUFS,
 	VIDIOC_QUERYBUF,
 	VIDIOC_QBUF,
@@ -649,6 +688,15 @@ int V4L2CameraProxy::ioctl(V4L2CameraFile *file, unsigned long request, void *ar
 	case VIDIOC_S_PRIORITY:
 		ret = vidioc_s_priority(file, static_cast<enum v4l2_priority *>(arg));
 		break;
+	case VIDIOC_ENUMINPUT:
+		ret = vidioc_enuminput(file, static_cast<struct v4l2_input *>(arg));
+		break;
+	case VIDIOC_G_INPUT:
+		ret = vidioc_g_input(file, static_cast<int *>(arg));
+		break;
+	case VIDIOC_S_INPUT:
+		ret = vidioc_s_input(file, static_cast<int *>(arg));
+		break;
 	case VIDIOC_REQBUFS:
 		ret = vidioc_reqbufs(file, static_cast<struct v4l2_requestbuffers *>(arg));
 		break;
diff --git a/src/v4l2/v4l2_camera_proxy.h b/src/v4l2/v4l2_camera_proxy.h
index a7293bf..bc427d4 100644
--- a/src/v4l2/v4l2_camera_proxy.h
+++ b/src/v4l2/v4l2_camera_proxy.h
@@ -54,6 +54,9 @@ private:
 	int vidioc_try_fmt(V4L2CameraFile *file, struct v4l2_format *arg);
 	int vidioc_g_priority(V4L2CameraFile *file, enum v4l2_priority *arg);
 	int vidioc_s_priority(V4L2CameraFile *file, enum v4l2_priority *arg);
+	int vidioc_enuminput(V4L2CameraFile *file, struct v4l2_input *arg);
+	int vidioc_g_input(V4L2CameraFile *file, int *arg);
+	int vidioc_s_input(V4L2CameraFile *file, int *arg);
 	int vidioc_reqbufs(V4L2CameraFile *file, struct v4l2_requestbuffers *arg);
 	int vidioc_querybuf(V4L2CameraFile *file, struct v4l2_buffer *arg);
 	int vidioc_qbuf(V4L2CameraFile *file, struct v4l2_buffer *arg);
-- 
2.27.0