linux-kernel - [RFC PATCH v8 06/13] media: uapi: Add V4L2_CAP_AUDIO

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Date:   Fri, 27 Oct 2023 18:35:41 +0800
From:   Shengjiu Wang <shengjiu.wang@....com>
To:     hverkuil@...all.nl, sakari.ailus@....fi, tfiga@...omium.org,
        m.szyprowski@...sung.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        shengjiu.wang@...il.com, Xiubo.Lee@...il.com, festevam@...il.com,
        nicoleotsuka@...il.com, lgirdwood@...il.com, broonie@...nel.org,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v8 06/13] media: uapi: Add V4L2_CAP_AUDIO_M2M capability flag

V4L2_CAP_AUDIO_M2M is similar to V4L2_CAP_VIDEO_M2M flag.

It is used for audio memory to memory case.

Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
---
 Documentation/userspace-api/media/v4l/vidioc-querycap.rst    | 3 +++
 Documentation/userspace-api/media/videodev2.h.rst.exceptions | 1 +
 include/uapi/linux/videodev2.h                               | 1 +
 3 files changed, 5 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
index 6c57b8428356..1c0d97bf192a 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
@@ -173,6 +173,9 @@ specification the ioctl returns an ``EINVAL`` error code.
 	interface. A video overlay device typically stores captured images
 	directly in the video memory of a graphics card, with hardware
 	clipping and scaling.
+    * - ``V4L2_CAP_AUDIO_M2M``
+      - 0x00000008
+      - The device supports the audio Memory-To-Memory interface.
     * - ``V4L2_CAP_VBI_CAPTURE``
       - 0x00000010
       - The device supports the :ref:`Raw VBI Capture <raw-vbi>`
diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
index 3e58aac4ef0b..da6d0b8e4c2c 100644
--- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
+++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
@@ -197,6 +197,7 @@ replace define V4L2_CAP_META_OUTPUT device-capabilities
 replace define V4L2_CAP_DEVICE_CAPS device-capabilities
 replace define V4L2_CAP_TOUCH device-capabilities
 replace define V4L2_CAP_IO_MC device-capabilities
+replace define V4L2_CAP_AUDIO_M2M device-capabilities
 
 # V4L2 pix flags
 replace define V4L2_PIX_FMT_PRIV_MAGIC :c:type:`v4l2_pix_format`
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index c3d4e490ce7c..5053f66c501a 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -473,6 +473,7 @@ struct v4l2_capability {
 #define V4L2_CAP_VIDEO_CAPTURE		0x00000001  /* Is a video capture device */
 #define V4L2_CAP_VIDEO_OUTPUT		0x00000002  /* Is a video output device */
 #define V4L2_CAP_VIDEO_OVERLAY		0x00000004  /* Can do video overlay */
+#define V4L2_CAP_AUDIO_M2M		0x00000008  /* audio memory to memory */
 #define V4L2_CAP_VBI_CAPTURE		0x00000010  /* Is a raw VBI capture device */
 #define V4L2_CAP_VBI_OUTPUT		0x00000020  /* Is a raw VBI output device */
 #define V4L2_CAP_SLICED_VBI_CAPTURE	0x00000040  /* Is a sliced VBI capture device */
-- 
2.34.1