€•›6      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ//translations/zh_CN/admin-guide/media/cafe_ccic”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ//translations/zh_TW/admin-guide/media/cafe_ccic”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ//translations/it_IT/admin-guide/media/cafe_ccic”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ//translations/ja_JP/admin-guide/media/cafe_ccic”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ//translations/ko_KR/admin-guide/media/cafe_ccic”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ//translations/sp_SP/admin-guide/media/cafe_ccic”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒcomment”“”)”}”(hŒ SPDX-License-Identifier: GPL-2.0”h]”hŒ SPDX-License-Identifier: GPL-2.0”…””}”hh£sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1h¡hhhžhhŸŒI/var/lib/git/docbuild/linux/Documentation/admin-guide/media/cafe_ccic.rst”h KubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒThe cafe_ccic driver”h]”hŒThe cafe_ccic driver”…””}”(hh»hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hh¶hžhhŸh³h KubhŒ	paragraph”“”)”}”(hŒ(Author: Jonathan Corbet <corbet@lwn.net>”h]”(hŒAuthor: Jonathan Corbet <”…””}”(hhËhžhhŸNh NubhŒ	reference”“”)”}”(hŒcorbet@lwn.net”h]”hŒcorbet@lwn.net”…””}”(hhÕhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œmailto:corbet@lwn.net”uh1hÓhhËubhŒ>”…””}”(hhËhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khh¶hžhubhµ)”}”(hhh]”(hº)”}”(hŒIntroduction”h]”hŒIntroduction”…””}”(hhòhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hhïhžhhŸh³h K	ubhÊ)”}”(hŒÎ"cafe_ccic" is a driver for the Marvell 88ALP01 "cafe" CMOS camera
controller.  This is the controller found in first-generation OLPC systems,
and this driver was written with support from the OLPC project.”h]”hŒÖâ€œcafe_ccicâ€ is a driver for the Marvell 88ALP01 â€œcafeâ€ CMOS camera
controller.  This is the controller found in first-generation OLPC systems,
and this driver was written with support from the OLPC project.”…””}”(hj   hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h KhhïhžhubhÊ)”}”(hXe  Current status: the core driver works.  It can generate data in YUV422,
RGB565, and RGB444 formats.  (Anybody looking at the code will see RGB32 as
well, but that is a debugging aid which will be removed shortly).  VGA and
QVGA modes work; CIF is there but the colors remain funky.  Only the OV7670
sensor is known to work with this controller at this time.”h]”hXe  Current status: the core driver works.  It can generate data in YUV422,
RGB565, and RGB444 formats.  (Anybody looking at the code will see RGB32 as
well, but that is a debugging aid which will be removed shortly).  VGA and
QVGA modes work; CIF is there but the colors remain funky.  Only the OV7670
sensor is known to work with this controller at this time.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h KhhïhžhubhÊ)”}”(hŒ2To try it out: either of these commands will work:”h]”hŒ2To try it out: either of these commands will work:”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h KhhïhžhubhŒliteral_block”“”)”}”(hŒˆ$ mplayer tv:// -tv driver=v4l2:width=640:height=480 -nosound
$ mplayer tv:// -tv driver=v4l2:width=640:height=480:outfmt=bgr16 -nosound”h]”hŒˆ$ mplayer tv:// -tv driver=v4l2:width=640:height=480 -nosound
$ mplayer tv:// -tv driver=v4l2:width=640:height=480:outfmt=bgr16 -nosound”…””}”hj,  sbah}”(h]”h ]”h"]”h$]”h&]”h±h²Œforce”‰Œlanguage”Œnone”Œhighlight_args”}”uh1j*  hŸh³h KhhïhžhubhÊ)”}”(hŒDThe "xawtv" utility also works; gqcam does not, for unknown reasons.”h]”hŒHThe â€œxawtvâ€ utility also works; gqcam does not, for unknown reasons.”…””}”(hj?  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khhïhžhubeh}”(h]”Œintroduction”ah ]”h"]”Œintroduction”ah$]”h&]”uh1h´hh¶hžhhŸh³h K	ubhµ)”}”(hhh]”(hº)”}”(hŒLoad time options”h]”hŒLoad time options”…””}”(hjX  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hjU  hžhhŸh³h KubhÊ)”}”(hŒ`There are a few load-time options, most of which can be changed after
loading via sysfs as well:”h]”hŒ`There are a few load-time options, most of which can be changed after
loading via sysfs as well:”…””}”(hjf  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K!hjU  hžhubhŒblock_quote”“”)”}”(hXj  - alloc_bufs_at_load:  Normally, the driver will not allocate any DMA
  buffers until the time comes to transfer data.  If this option is set,
  then worst-case-sized buffers will be allocated at module load time.
  This option nails down the memory for the life of the module, but
  perhaps decreases the chances of an allocation failure later on.

- dma_buf_size: The size of DMA buffers to allocate.  Note that this
  option is only consulted for load-time allocation; when buffers are
  allocated at run time, they will be sized appropriately for the current
  camera settings.

- n_dma_bufs: The controller can cycle through either two or three DMA
  buffers.  Normally, the driver tries to use three buffers; on faster
  systems, however, it will work well with only two.

- min_buffers: The minimum number of streaming I/O buffers that the driver
  will consent to work with.  Default is one, but, on slower systems,
  better behavior with mplayer can be achieved by setting to a higher
  value (like six).

- max_buffers: The maximum number of streaming I/O buffers; default is
  ten.  That number was carefully picked out of a hat and should not be
  assumed to actually mean much of anything.

- flip: If this boolean parameter is set, the sensor will be instructed to
  invert the video image.  Whether it makes sense is determined by how
  your particular camera is mounted.”h]”hŒbullet_list”“”)”}”(hhh]”(hŒ	list_item”“”)”}”(hXS  alloc_bufs_at_load:  Normally, the driver will not allocate any DMA
buffers until the time comes to transfer data.  If this option is set,
then worst-case-sized buffers will be allocated at module load time.
This option nails down the memory for the life of the module, but
perhaps decreases the chances of an allocation failure later on.
”h]”hÊ)”}”(hXR  alloc_bufs_at_load:  Normally, the driver will not allocate any DMA
buffers until the time comes to transfer data.  If this option is set,
then worst-case-sized buffers will be allocated at module load time.
This option nails down the memory for the life of the module, but
perhaps decreases the chances of an allocation failure later on.”h]”hXR  alloc_bufs_at_load:  Normally, the driver will not allocate any DMA
buffers until the time comes to transfer data.  If this option is set,
then worst-case-sized buffers will be allocated at module load time.
This option nails down the memory for the life of the module, but
perhaps decreases the chances of an allocation failure later on.”…””}”(hj…  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K$hj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj|  ubj€  )”}”(hŒàdma_buf_size: The size of DMA buffers to allocate.  Note that this
option is only consulted for load-time allocation; when buffers are
allocated at run time, they will be sized appropriately for the current
camera settings.
”h]”hÊ)”}”(hŒßdma_buf_size: The size of DMA buffers to allocate.  Note that this
option is only consulted for load-time allocation; when buffers are
allocated at run time, they will be sized appropriately for the current
camera settings.”h]”hŒßdma_buf_size: The size of DMA buffers to allocate.  Note that this
option is only consulted for load-time allocation; when buffers are
allocated at run time, they will be sized appropriately for the current
camera settings.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K*hj™  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj|  ubj€  )”}”(hŒ½n_dma_bufs: The controller can cycle through either two or three DMA
buffers.  Normally, the driver tries to use three buffers; on faster
systems, however, it will work well with only two.
”h]”hÊ)”}”(hŒ¼n_dma_bufs: The controller can cycle through either two or three DMA
buffers.  Normally, the driver tries to use three buffers; on faster
systems, however, it will work well with only two.”h]”hŒ¼n_dma_bufs: The controller can cycle through either two or three DMA
buffers.  Normally, the driver tries to use three buffers; on faster
systems, however, it will work well with only two.”…””}”(hjµ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K/hj±  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj|  ubj€  )”}”(hŒãmin_buffers: The minimum number of streaming I/O buffers that the driver
will consent to work with.  Default is one, but, on slower systems,
better behavior with mplayer can be achieved by setting to a higher
value (like six).
”h]”hÊ)”}”(hŒâmin_buffers: The minimum number of streaming I/O buffers that the driver
will consent to work with.  Default is one, but, on slower systems,
better behavior with mplayer can be achieved by setting to a higher
value (like six).”h]”hŒâmin_buffers: The minimum number of streaming I/O buffers that the driver
will consent to work with.  Default is one, but, on slower systems,
better behavior with mplayer can be achieved by setting to a higher
value (like six).”…””}”(hjÍ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K3hjÉ  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj|  ubj€  )”}”(hŒ¶max_buffers: The maximum number of streaming I/O buffers; default is
ten.  That number was carefully picked out of a hat and should not be
assumed to actually mean much of anything.
”h]”hÊ)”}”(hŒµmax_buffers: The maximum number of streaming I/O buffers; default is
ten.  That number was carefully picked out of a hat and should not be
assumed to actually mean much of anything.”h]”hŒµmax_buffers: The maximum number of streaming I/O buffers; default is
ten.  That number was carefully picked out of a hat and should not be
assumed to actually mean much of anything.”…””}”(hjå  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K8hjá  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj|  ubj€  )”}”(hŒ°flip: If this boolean parameter is set, the sensor will be instructed to
invert the video image.  Whether it makes sense is determined by how
your particular camera is mounted.”h]”hÊ)”}”(hŒ°flip: If this boolean parameter is set, the sensor will be instructed to
invert the video image.  Whether it makes sense is determined by how
your particular camera is mounted.”h]”hŒ°flip: If this boolean parameter is set, the sensor will be instructed to
invert the video image.  Whether it makes sense is determined by how
your particular camera is mounted.”…””}”(hjý  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K<hjù  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj|  ubeh}”(h]”h ]”h"]”h$]”h&]”Œbullet”Œ-”uh1jz  hŸh³h K$hjv  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jt  hŸh³h K$hjU  hžhubeh}”(h]”Œload-time-options”ah ]”h"]”Œload time options”ah$]”h&]”uh1h´hh¶hžhhŸh³h Kubeh}”(h]”Œthe-cafe-ccic-driver”ah ]”h"]”Œthe cafe_ccic driver”ah$]”h&]”uh1h´hhhžhhŸh³h Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”h³uh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(h¹NŒ	generator”NŒ	datestamp”NŒsource_link”NŒ
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