From e25436581f4117a0df9bf5539f6a7702a78df317 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Fri, 7 Mar 2014 11:17:33 -0300 Subject: [media] DocBook v4l2: update the G/S_EDID documentation Document that it is now possible to call G/S_EDID from video nodes, not just sub-device nodes. Add a note that -EINVAL will be returned if the pad does not support EDIDs. Signed-off-by: Hans Verkuil Acked-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab --- .../DocBook/media/v4l/vidioc-subdev-g-edid.xml | 152 --------------------- 1 file changed, 152 deletions(-) delete mode 100644 Documentation/DocBook/media/v4l/vidioc-subdev-g-edid.xml (limited to 'Documentation/DocBook/media/v4l/vidioc-subdev-g-edid.xml') diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-g-edid.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-g-edid.xml deleted file mode 100644 index bbd18f0e6ede..000000000000 --- a/Documentation/DocBook/media/v4l/vidioc-subdev-g-edid.xml +++ /dev/null @@ -1,152 +0,0 @@ - - - ioctl VIDIOC_SUBDEV_G_EDID, VIDIOC_SUBDEV_S_EDID - &manvol; - - - - VIDIOC_SUBDEV_G_EDID - VIDIOC_SUBDEV_S_EDID - Get or set the EDID of a video receiver/transmitter - - - - - - int ioctl - int fd - int request - struct v4l2_subdev_edid *argp - - - - - int ioctl - int fd - int request - const struct v4l2_subdev_edid *argp - - - - - - Arguments - - - - fd - - &fd; - - - - request - - VIDIOC_SUBDEV_G_EDID, VIDIOC_SUBDEV_S_EDID - - - - argp - - - - - - - - - Description - These ioctls can be used to get or set an EDID associated with an input pad - from a receiver or an output pad of a transmitter subdevice. - - To get the EDID data the application has to fill in the pad, - start_block, blocks and edid - fields and call VIDIOC_SUBDEV_G_EDID. The current EDID from block - start_block and of size blocks - will be placed in the memory edid points to. The edid - pointer must point to memory at least blocks * 128 bytes - large (the size of one block is 128 bytes). - - If there are fewer blocks than specified, then the driver will set blocks - to the actual number of blocks. If there are no EDID blocks available at all, then the error code - ENODATA is set. - - If blocks have to be retrieved from the sink, then this call will block until they - have been read. - - To set the EDID blocks of a receiver the application has to fill in the pad, - blocks and edid fields and set - start_block to 0. It is not possible to set part of an EDID, - it is always all or nothing. Setting the EDID data is only valid for receivers as it makes - no sense for a transmitter. - - The driver assumes that the full EDID is passed in. If there are more EDID blocks than - the hardware can handle then the EDID is not written, but instead the error code E2BIG is set - and blocks is set to the maximum that the hardware supports. - If start_block is any - value other than 0 then the error code EINVAL is set. - - To disable an EDID you set blocks to 0. Depending on the - hardware this will drive the hotplug pin low and/or block the source from reading the EDID - data in some way. In any case, the end result is the same: the EDID is no longer available. - - - - struct <structname>v4l2_subdev_edid</structname> - - &cs-str; - - - __u32 - pad - Pad for which to get/set the EDID blocks. - - - __u32 - start_block - Read the EDID from starting with this block. Must be 0 when setting - the EDID. - - - __u32 - blocks - The number of blocks to get or set. Must be less or equal to 256 (the - maximum number of blocks as defined by the standard). When you set the EDID and - blocks is 0, then the EDID is disabled or erased. - - - __u8 * - edid - Pointer to memory that contains the EDID. The minimum size is - blocks * 128. - - - __u32 - reserved[5] - Reserved for future extensions. Applications and drivers must - set the array to zero. - - - -
- - - - &return-value; - - - - ENODATA - - The EDID data is not available. - - - - E2BIG - - The EDID data you provided is more than the hardware can handle. - - - - - -- cgit v1.2.3-59-g8ed1b