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libcamera: v4l2_device: Add setFd()

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Provide a means for V4L2 device instances to set the fd_ explicitly.
This allows for V4L2Devices to operate when they must use an external
open() call.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
This commit is contained in:
Kieran Bingham 2019-08-08 14:30:03 +01:00
parent a6799dc5b9
commit e0f35d6f57
2 changed files with 27 additions and 0 deletions
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26
src/libcamera/v4l2_device.cpp
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@ -88,6 +88,32 @@ int V4L2Device::open(unsigned int flags)
return 0;
}
/**
* \brief Set the file descriptor of a V4L2 device
* \param[in] fd The file descriptor handle
*
* This method allows a device to provide an already opened file descriptor
* referring to the V4L2 device node, instead of opening it with open(). This
* can be used for V4L2 M2M devices where a single video device node is used for
* both the output and capture devices, or when receiving an open file
* descriptor in a context that doesn't have permission to open the device node
* itself.
*
* This method and the open() method are mutually exclusive, only one of the two
* shall be used for a V4L2Device instance.
*
* \return 0 on success or a negative error code otherwise
*/
int V4L2Device::setFd(int fd)
{
if (isOpen())
return -EBUSY;
fd_ = fd;
return 0;
}
/**
* \brief Close the device node
*