[media] V4L: Add capability flags for memory-to-memory devices

This patch adds new V4L2_CAP_VIDEO_M2M and V4L2_CAP_VIDEO_M2M_MPLANE
capability flags that are intended to be used for memory-to-memory (M2M)
devices, instead of ORed V4L2_CAP_VIDEO_CAPTURE and V4L2_CAP_VIDEO_OUTPUT.

V4L2_CAP_VIDEO_M2M flag is added at the drivers, CAPTURE and OUTPUT
capability flags are left untouched and will be removed in future,
after a transition period required for existing applications to be
adapted to check only for V4L2_CAP_VIDEO_M2M.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Kamil Debski <k.debski@samsung.com>
Acked-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Documentation/DocBook/media/v4l/compat.xml

@@ -2471,6 +2471,15 @@ that used it. It was originally scheduled for removal in 2.6.35.
       </orderedlist>
     </section>
 
+    <section>
+      <title>V4L2 in Linux 3.6</title>
+      <orderedlist>
+        <listitem>
+	  <para>Added V4L2_CAP_VIDEO_M2M and V4L2_CAP_VIDEO_M2M_MPLANE capabilities.</para>
+        </listitem>
+      </orderedlist>
+    </section>
+
     <section id="other">
       <title>Relation of V4L2 to other Linux multimedia APIs</title>
 

Documentation/DocBook/media/v4l/vidioc-querycap.xml

@@ -191,6 +191,19 @@ linkend="output">Video Output</link> interface.</entry>
 	    <link linkend="planar-apis">multi-planar API</link> through the
 	    <link linkend="output">Video Output</link> interface.</entry>
 	  </row>
+	  <row>
+	    <entry><constant>V4L2_CAP_VIDEO_M2M</constant></entry>
+	    <entry>0x00004000</entry>
+	    <entry>The device supports the single-planar API through the
+	    Video Memory-To-Memory interface.</entry>
+	  </row>
+	  <row>
+	    <entry><constant>V4L2_CAP_VIDEO_M2M_MPLANE</constant></entry>
+	    <entry>0x00008000</entry>
+	    <entry>The device supports the
+	    <link linkend="planar-apis">multi-planar API</link> through the
+	    Video Memory-To-Memory  interface.</entry>
+	  </row>
 	  <row>
 	    <entry><constant>V4L2_CAP_VIDEO_OVERLAY</constant></entry>
 	    <entry>0x00000004</entry>

drivers/media/video/mem2mem_testdev.c

@@ -431,8 +431,7 @@ static int vidioc_querycap(struct file *file, void *priv,
 	strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
 	strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
 	strlcpy(cap->bus_info, MEM2MEM_NAME, sizeof(cap->bus_info));
-	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
-			  | V4L2_CAP_STREAMING;
+	cap->capabilities = V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
 	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
 	return 0;
 }

drivers/media/video/mx2_emmaprp.c

@@ -396,9 +396,13 @@ static int vidioc_querycap(struct file *file, void *priv,
 {
 	strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
 	strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
-	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
-			  | V4L2_CAP_STREAMING;
-
+	/*
+	 * This is only a mem-to-mem video device. The capture and output
+	 * device capability flags are left only for backward compatibility
+	 * and are scheduled for removal.
+	 */
+	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT |
+			    V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
 	return 0;
 }
 

drivers/media/video/s5p-fimc/fimc-m2m.c

@@ -259,7 +259,12 @@ static int fimc_m2m_querycap(struct file *file, void *fh,
 	strncpy(cap->driver, fimc->pdev->name, sizeof(cap->driver) - 1);
 	strncpy(cap->card, fimc->pdev->name, sizeof(cap->card) - 1);
 	cap->bus_info[0] = 0;
-	cap->capabilities = V4L2_CAP_STREAMING |
+	/*
+	 * This is only a mem-to-mem video device. The capture and output
+	 * device capability flags are left only for backward compatibility
+	 * and are scheduled for removal.
+	 */
+	cap->capabilities = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE |
 		V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_VIDEO_OUTPUT_MPLANE;
 
 	return 0;

drivers/media/video/s5p-g2d/g2d.c

@@ -290,8 +290,13 @@ static int vidioc_querycap(struct file *file, void *priv,
 	strncpy(cap->card, G2D_NAME, sizeof(cap->card) - 1);
 	cap->bus_info[0] = 0;
 	cap->version = KERNEL_VERSION(1, 0, 0);
-	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
-							| V4L2_CAP_STREAMING;
+	/*
+	 * This is only a mem-to-mem video device. The capture and output
+	 * device capability flags are left only for backward compatibility
+	 * and are scheduled for removal.
+	 */
+	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT |
+			    V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
 	return 0;
 }
 

drivers/media/video/s5p-jpeg/jpeg-core.c

@@ -489,9 +489,13 @@ static int s5p_jpeg_querycap(struct file *file, void *priv,
 			sizeof(cap->card));
 	}
 	cap->bus_info[0] = 0;
-	cap->capabilities = V4L2_CAP_STREAMING |
-			    V4L2_CAP_VIDEO_CAPTURE |
-			    V4L2_CAP_VIDEO_OUTPUT;
+	/*
+	 * This is only a mem-to-mem video device. The capture and output
+	 * device capability flags are left only for backward compatibility
+	 * and are scheduled for removal.
+	 */
+	cap->capabilities = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M |
+			    V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT;
 	return 0;
 }
 

drivers/media/video/s5p-mfc/s5p_mfc_dec.c

@@ -220,8 +220,14 @@ static int vidioc_querycap(struct file *file, void *priv,
 	strncpy(cap->card, dev->plat_dev->name, sizeof(cap->card) - 1);
 	cap->bus_info[0] = 0;
 	cap->version = KERNEL_VERSION(1, 0, 0);
-	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE_MPLANE |
-			V4L2_CAP_VIDEO_OUTPUT_MPLANE | V4L2_CAP_STREAMING;
+	/*
+	 * This is only a mem-to-mem video device. The capture and output
+	 * device capability flags are left only for backward compatibility
+	 * and are scheduled for removal.
+	 */
+	cap->capabilities = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING |
+			    V4L2_CAP_VIDEO_CAPTURE_MPLANE |
+			    V4L2_CAP_VIDEO_OUTPUT_MPLANE;
 	return 0;
 }
 

drivers/media/video/s5p-mfc/s5p_mfc_enc.c

@@ -779,9 +779,14 @@ static int vidioc_querycap(struct file *file, void *priv,
 	strncpy(cap->card, dev->plat_dev->name, sizeof(cap->card) - 1);
 	cap->bus_info[0] = 0;
 	cap->version = KERNEL_VERSION(1, 0, 0);
-	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE_MPLANE
-			  | V4L2_CAP_VIDEO_OUTPUT_MPLANE
-			  | V4L2_CAP_STREAMING;
+	/*
+	 * This is only a mem-to-mem video device. The capture and output
+	 * device capability flags are left only for backward compatibility
+	 * and are scheduled for removal.
+	 */
+	cap->capabilities = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING |
+			    V4L2_CAP_VIDEO_CAPTURE_MPLANE |
+			    V4L2_CAP_VIDEO_OUTPUT_MPLANE;
 	return 0;
 }
 

include/linux/videodev2.h

@@ -274,6 +274,10 @@ struct v4l2_capability {
 #define V4L2_CAP_VIDEO_CAPTURE_MPLANE	0x00001000
 /* Is a video output device that supports multiplanar formats */
 #define V4L2_CAP_VIDEO_OUTPUT_MPLANE	0x00002000
+/* Is a video mem-to-mem device that supports multiplanar formats */
+#define V4L2_CAP_VIDEO_M2M_MPLANE	0x00004000
+/* Is a video mem-to-mem device */
+#define V4L2_CAP_VIDEO_M2M		0x00008000
 
 #define V4L2_CAP_TUNER			0x00010000  /* has a tuner */
 #define V4L2_CAP_AUDIO			0x00020000  /* has audio support */