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2018-05-22v4l2: Replace USERPTR support with DMABUF supportLaurent Pinchart
V4L2_MEMORY_USERPTR is deprecated, replace it with V4L2_MEMORY_DMABUF support for buffer sharing. Two new functions are added, v4l2_export_buffers() to export previously allocated buffers as dmabuf objects, and v4l2_import_buffers() to import dmabuf objects as backing store for V4L2 buffers. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-05-22v4l2: Split buffer allocation and mappingLaurent Pinchart
Not all use cases of V4L2_MEMORY_MMAP require mapping buffers to userspace. Separate the allocation and mapping to allow usage of unmapped buffers. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-05-22v4l2: Import V4L2 support code from omap3-isp-liveLaurent Pinchart
The omap3-isp-live project [1] includes generic V4L2 support code that implements the V4L2 API. Instead of reinventing the wheel, import the code and use it. The code has been modified to merge the V4L2 buffers pool implementation in the V4L2 support code as the abstraction wasn't right for the uvc-gadget project. Further refactoring will be performed separately. The original license hasn't been modified from the original LGPL-2.1+. The sole copyright owner is Laurent Pinchart. [1] git://git.ideasonboard.org/omap3-isp-live.git Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>