[RFC PATCH v7 09/13] media: uapi: Add V4L2_CTRL_CLASS_M2M_AUDIO

[Shengjiu Wang]

The Audio M2M class includes controls for audio memory-to-memory
use cases. The controls can be used for audio codecs, audio
preprocessing, audio postprocessing.

Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
---
 .../userspace-api/media/v4l/common.rst        |  1 +
 .../media/v4l/ext-ctrls-audio-m2m.rst         | 21 +++++++++++++++++++
 .../media/v4l/vidioc-g-ext-ctrls.rst          |  4 ++++
 drivers/media/v4l2-core/v4l2-ctrls-defs.c     |  4 ++++
 include/uapi/linux/v4l2-controls.h            |  4 ++++
 5 files changed, 34 insertions(+)
 create mode 100644 Documentation/userspace-api/media/v4l/ext-ctrls-audio-m2m.rst

diff --git a/Documentation/userspace-api/media/v4l/common.rst b/Documentation/userspace-api/media/v4l/common.rst
index ea0435182e44..d5366e96a596 100644
--- a/Documentation/userspace-api/media/v4l/common.rst
+++ b/Documentation/userspace-api/media/v4l/common.rst
@@ -52,6 +52,7 @@ applicable to all devices.
     ext-ctrls-fm-rx
     ext-ctrls-detect
     ext-ctrls-colorimetry
+    ext-ctrls-audio-m2m
     fourcc
     format
     planar-apis
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-audio-m2m.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-audio-m2m.rst
new file mode 100644
index 000000000000..82d2ecedbfee
--- /dev/null
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-audio-m2m.rst
@@ -0,0 +1,21 @@
+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+
+.. _audiom2m-controls:
+
+***************************
+Audio M2M Control Reference
+***************************
+
+The Audio M2M class includes controls for audio memory-to-memory
+use cases. The controls can be used for audio codecs, audio
+preprocessing, audio postprocessing.
+
+Audio M2M Control IDs
+-----------------------
+
+.. _audiom2m-control-id:
+
+``V4L2_CID_M2M_AUDIO_CLASS (class)``
+    The Audio M2M class descriptor. Calling
+    :ref:`VIDIOC_QUERYCTRL` for this control will
+    return a description of this control class.
diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
index f9f73530a6be..e8475f9fd2cf 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
@@ -480,6 +480,10 @@ still cause this situation.
       - 0xa50000
       - The class containing colorimetry controls. These controls are
 	described in :ref:`colorimetry-controls`.
+    * - ``V4L2_CTRL_CLASS_M2M_AUDIO``
+      - 0xa60000
+      - The class containing audio m2m controls. These controls are
+	described in :ref:`audiom2m-controls`.
 
 Return Value
 ============
diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
index 8696eb1cdd61..2a85ea3dc92f 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
@@ -1242,6 +1242,9 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_COLORIMETRY_CLASS:	return "Colorimetry Controls";
 	case V4L2_CID_COLORIMETRY_HDR10_CLL_INFO:		return "HDR10 Content Light Info";
 	case V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY:	return "HDR10 Mastering Display";
+
+	/* Audio M2M controls */
+	case V4L2_CID_M2M_AUDIO_CLASS:  return "Audio M2M Controls";
 	default:
 		return NULL;
 	}
@@ -1451,6 +1454,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 	case V4L2_CID_DETECT_CLASS:
 	case V4L2_CID_CODEC_STATELESS_CLASS:
 	case V4L2_CID_COLORIMETRY_CLASS:
+	case V4L2_CID_M2M_AUDIO_CLASS:
 		*type = V4L2_CTRL_TYPE_CTRL_CLASS;
 		/* You can neither read nor write these */
 		*flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 68db66d4aae8..eb0f0a76f867 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -30,6 +30,7 @@
 #define V4L2_CTRL_CLASS_DETECT		0x00a30000	/* Detection controls */
 #define V4L2_CTRL_CLASS_CODEC_STATELESS 0x00a40000	/* Stateless codecs controls */
 #define V4L2_CTRL_CLASS_COLORIMETRY	0x00a50000	/* Colorimetry controls */
+#define V4L2_CTRL_CLASS_M2M_AUDIO	0x00a60000	/* Audio M2M controls */
 
 /* User-class control IDs */
 
@@ -3494,4 +3495,7 @@ struct v4l2_ctrl_av1_film_grain {
 #define V4L2_CID_MPEG_MFC51_BASE        V4L2_CID_CODEC_MFC51_BASE
 #endif
 
+#define V4L2_CID_M2M_AUDIO_CLASS_BASE  (V4L2_CTRL_CLASS_M2M_AUDIO | 0x900)
+#define V4L2_CID_M2M_AUDIO_CLASS       (V4L2_CTRL_CLASS_M2M_AUDIO | 1)
+
 #endif
-- 
2.34.1