[media] V4L2: Add per-device-node capabilities
If V4L2_CAP_DEVICE_CAPS is set, then the new device_caps field is filled with the capabilities of the opened device node. The capabilities field traditionally contains the capabilities of the physical device, being a superset of all capabilities available at the several device nodes. E.g., if you open /dev/video0, then if it contains VBI caps then that means that there is a corresponding vbi node as well. And the capabilities field of both the video and vbi nodes should contain identical caps. However, it would be very useful to also have a capabilities field that contains just the caps for the currently open device, hence the new CAP bit and field. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil
Mauro Carvalho Chehab
Родитель
93596ef7db
Коммит
583aa3a9b5
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@ -2393,6 +2393,10 @@ details.</para>
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to the <link linkend="control">User controls class</link>.
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</para>
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</listitem>
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<listitem>
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<para>Added the device_caps field to struct v4l2_capabilities and added the new
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V4L2_CAP_DEVICE_CAPS capability.</para>
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</listitem>
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</orderedlist>
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</section>
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@ -127,6 +127,13 @@ structs, ioctls) must be noted in more detail in the history chapter
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(compat.xml), along with the possible impact on existing drivers and
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applications. -->
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<revision>
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<revnumber>3.3</revnumber>
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<date>2012-01-11</date>
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<authorinitials>hv</authorinitials>
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<revremark>Added device_caps field to struct v4l2_capabilities.</revremark>
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</revision>
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<revision>
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<revnumber>3.2</revnumber>
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<date>2011-08-26</date>
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@ -417,7 +424,7 @@ and discussions on the V4L mailing list.</revremark>
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</partinfo>
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<title>Video for Linux Two API Specification</title>
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<subtitle>Revision 3.2</subtitle>
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<subtitle>Revision 3.3</subtitle>
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<chapter id="common">
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&sub-common;
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@ -124,12 +124,35 @@ printf ("Version: %u.%u.%u\n",
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<row>
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<entry>__u32</entry>
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<entry><structfield>capabilities</structfield></entry>
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<entry>Device capabilities, see <xref
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linkend="device-capabilities" />.</entry>
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<entry>Available capabilities of the physical device as a whole, see <xref
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linkend="device-capabilities" />. The same physical device can export
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multiple devices in /dev (e.g. /dev/videoX, /dev/vbiY and /dev/radioZ).
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The <structfield>capabilities</structfield> field should contain a union
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of all capabilities available around the several V4L2 devices exported
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to userspace.
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For all those devices the <structfield>capabilities</structfield> field
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returns the same set of capabilities. This allows applications to open
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just one of the devices (typically the video device) and discover whether
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video, vbi and/or radio are also supported.
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</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>reserved</structfield>[4]</entry>
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<entry><structfield>device_caps</structfield></entry>
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<entry>Device capabilities of the opened device, see <xref
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linkend="device-capabilities" />. Should contain the available capabilities
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of that specific device node. So, for example, <structfield>device_caps</structfield>
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of a radio device will only contain radio related capabilities and
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no video or vbi capabilities. This field is only set if the <structfield>capabilities</structfield>
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field contains the <constant>V4L2_CAP_DEVICE_CAPS</constant> capability.
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Only the <structfield>capabilities</structfield> field can have the
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<constant>V4L2_CAP_DEVICE_CAPS</constant> capability, <structfield>device_caps</structfield>
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will never set <constant>V4L2_CAP_DEVICE_CAPS</constant>.
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</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>reserved</structfield>[3]</entry>
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<entry>Reserved for future extensions. Drivers must set
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this array to zero.</entry>
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</row>
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@ -276,6 +299,13 @@ linkend="async">asynchronous</link> I/O methods.</entry>
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<entry>The device supports the <link
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linkend="mmap">streaming</link> I/O method.</entry>
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</row>
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<row>
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<entry><constant>V4L2_CAP_DEVICE_CAPS</constant></entry>
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<entry>0x80000000</entry>
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<entry>The driver fills the <structfield>device_caps</structfield>
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field. This capability can only appear in the <structfield>capabilities</structfield>
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field and never in the <structfield>device_caps</structfield> field.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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@ -1686,7 +1686,6 @@ static struct v4l2_capability pvr_capability = {
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.capabilities = (V4L2_CAP_VIDEO_CAPTURE |
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V4L2_CAP_TUNER | V4L2_CAP_AUDIO | V4L2_CAP_RADIO |
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V4L2_CAP_STREAMING | V4L2_CAP_READWRITE),
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.reserved = {0, 0, 0, 0}
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};
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *cap)
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@ -96,7 +96,6 @@ static struct v4l2_capability pvr_capability ={
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.capabilities = (V4L2_CAP_VIDEO_CAPTURE |
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V4L2_CAP_TUNER | V4L2_CAP_AUDIO | V4L2_CAP_RADIO |
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V4L2_CAP_READWRITE),
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.reserved = {0,0,0,0}
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};
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static struct v4l2_fmtdesc pvr_fmtdesc [] = {
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@ -540,10 +540,12 @@ static long __video_do_ioctl(struct file *file,
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if (!ret)
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dbgarg(cmd, "driver=%s, card=%s, bus=%s, "
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"version=0x%08x, "
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"capabilities=0x%08x\n",
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"capabilities=0x%08x, "
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"device_caps=0x%08x\n",
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cap->driver, cap->card, cap->bus_info,
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cap->version,
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cap->capabilities);
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cap->capabilities,
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cap->device_caps);
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break;
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}
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@ -235,16 +235,25 @@ struct v4l2_fract {
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__u32 denominator;
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};
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/*
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* D R I V E R C A P A B I L I T I E S
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*/
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/**
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* struct v4l2_capability - Describes V4L2 device caps returned by VIDIOC_QUERYCAP
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*
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* @driver: name of the driver module (e.g. "bttv")
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* @card: name of the card (e.g. "Hauppauge WinTV")
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* @bus_info: name of the bus (e.g. "PCI:" + pci_name(pci_dev) )
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* @version: KERNEL_VERSION
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* @capabilities: capabilities of the physical device as a whole
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* @device_caps: capabilities accessed via this particular device (node)
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* @reserved: reserved fields for future extensions
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*/
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struct v4l2_capability {
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__u8 driver[16]; /* i.e. "bttv" */
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__u8 card[32]; /* i.e. "Hauppauge WinTV" */
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__u8 bus_info[32]; /* "PCI:" + pci_name(pci_dev) */
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__u32 version; /* should use KERNEL_VERSION() */
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__u32 capabilities; /* Device capabilities */
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__u32 reserved[4];
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__u8 driver[16];
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__u8 card[32];
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__u8 bus_info[32];
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__u32 version;
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__u32 capabilities;
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__u32 device_caps;
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__u32 reserved[3];
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};
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/* Values for 'capabilities' field */
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@ -274,6 +283,8 @@ struct v4l2_capability {
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#define V4L2_CAP_ASYNCIO 0x02000000 /* async I/O */
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#define V4L2_CAP_STREAMING 0x04000000 /* streaming I/O ioctls */
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#define V4L2_CAP_DEVICE_CAPS 0x80000000 /* sets device capabilities field */
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/*
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* V I D E O I M A G E F O R M A T
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*/
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