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Commit a7a1c0e6 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
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V4L/DVB (10571): v4l2-framework.txt: Fixes the videobuf init functions 



Documents the driver usage functions, instead of the generic one used
by the videobuf specific handlers.

Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 44061c05

Documentation/video4linux/v4l2-framework.txt

+21 −9
Original line number Diff line number Diff line
@@ -575,9 +575,21 @@ request. The code is generally like this one: 
Those are the videobuffer functions used on drivers, implemented on

videobuf-core:



- videobuf_queue_core_init()

- Videobuf init functions

  videobuf_queue_sg_init()

      Initializes the videobuf infrastructure. This function should be

  called before any other videobuf function.

      called before any other videobuf function on drivers that uses DMA

      Scatter/Gather buffers.



  videobuf_queue_dma_contig_init

      Initializes the videobuf infrastructure. This function should be

      called before any other videobuf function on drivers that need DMA

      contiguous buffers.



  videobuf_queue_vmalloc_init()

      Initializes the videobuf infrastructure. This function should be

      called before any other videobuf function on USB (and other drivers)

      that need a vmalloced type of videobuf.



- videobuf_iolock()

  Prepares the videobuf memory for the proper method (read, mmap, overlay).