d42bffb899
Kernel module (device driver) for dt3155 frame grabber
video4linux2 compliant (finally). Works with "xawtv -f".
======================================================
This driver is written (almost) from scratch, using the
allocator developed for dt3155pci see bellow). The driver
uses videobuf-dma-contig interface modified to use the above
mentioned allocator instead of dma_alloc_coheren().
The first thing to do was to design a new allocator based
on allocating a configurable number of 4MB chunks of memory,
that latter are broken into frame buffers of 768x576 bytes
kept in different FIFOs (queues). As far as the driver autoloads
as a kernel module during kernel boot, the allocation of 4MB
chunks succeeds.
The driver keeps three FIFOs: one for 4MB chunks, one for free
buffers (available for allocations) and one for buffers already
allocated. Allocation/deallocation is done automatically though
the video4linux videobuf subsystem (some pointers to functions
are replaced by driver supplied functions).
Sure, there are problems:
1. The device tested to work with "xawtv -f" either via read()
method (DT3155_STREAMING not selected), or via mmap() method
(DT3155_STREAMING is selected) only. This coresponds to either
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
or
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
but not when
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_STREAMING |
V4L2_CAP_READWRITE;
This is because xawtv calls poll() before starting streaming,
but videobuf_poll_stream() automatically starts reading if streaming
is not started.
This selection is made during kernel configuration (for now).
2. Works for CCIR, but should work for RS-170 (not tested)
This is made also during kernel configuration.
3. Could work for multiple dt3155 frame grabbers in a PC,
(private data is allocated during PCI probe() method), but
is not tested due to lack of a second board.
4. Not tested on a BIG ENDIAN architecture.
5. Many others you could find .... :-)
All critics, comments, suggestions are wellcome.
Signed-off-by: Marin Mitov <mitov@issp.bas.bg>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
149 lines
3.7 KiB
Text
149 lines
3.7 KiB
Text
menuconfig STAGING
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bool "Staging drivers"
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default n
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---help---
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This option allows you to select a number of drivers that are
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not of the "normal" Linux kernel quality level. These drivers
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are placed here in order to get a wider audience to make use of
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them. Please note that these drivers are under heavy
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development, may or may not work, and may contain userspace
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interfaces that most likely will be changed in the near
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future.
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Using any of these drivers will taint your kernel which might
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affect support options from both the community, and various
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commercial support organizations.
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If you wish to work on these drivers, to help improve them, or
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to report problems you have with them, please see the
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driver_name.README file in the drivers/staging/ directory to
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see what needs to be worked on, and who to contact.
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If in doubt, say N here.
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if STAGING
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config STAGING_EXCLUDE_BUILD
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bool "Exclude Staging drivers from being built" if STAGING
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default y
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---help---
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Are you sure you really want to build the staging drivers?
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They taint your kernel, don't live up to the normal Linux
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kernel quality standards, are a bit crufty around the edges,
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and might go off and kick your dog when you aren't paying
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attention.
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Say N here to be able to select and build the Staging drivers.
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This option is primarily here to prevent them from being built
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when selecting 'make allyesconfg' and 'make allmodconfig' so
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don't be all that put off, your dog will be just fine.
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if !STAGING_EXCLUDE_BUILD
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source "drivers/staging/et131x/Kconfig"
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source "drivers/staging/slicoss/Kconfig"
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source "drivers/staging/go7007/Kconfig"
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source "drivers/staging/cx25821/Kconfig"
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source "drivers/staging/usbip/Kconfig"
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source "drivers/staging/winbond/Kconfig"
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source "drivers/staging/wlan-ng/Kconfig"
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source "drivers/staging/echo/Kconfig"
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source "drivers/staging/otus/Kconfig"
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source "drivers/staging/rt2860/Kconfig"
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source "drivers/staging/rt2870/Kconfig"
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source "drivers/staging/comedi/Kconfig"
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source "drivers/staging/asus_oled/Kconfig"
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source "drivers/staging/panel/Kconfig"
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source "drivers/staging/rtl8187se/Kconfig"
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source "drivers/staging/rtl8192su/Kconfig"
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source "drivers/staging/rtl8192u/Kconfig"
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source "drivers/staging/rtl8192e/Kconfig"
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source "drivers/staging/frontier/Kconfig"
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source "drivers/staging/dream/Kconfig"
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source "drivers/staging/pohmelfs/Kconfig"
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source "drivers/staging/phison/Kconfig"
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source "drivers/staging/line6/Kconfig"
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source "drivers/gpu/drm/vmwgfx/Kconfig"
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source "drivers/gpu/drm/nouveau/Kconfig"
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source "drivers/staging/octeon/Kconfig"
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source "drivers/staging/serqt_usb2/Kconfig"
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source "drivers/staging/quatech_usb2/Kconfig"
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source "drivers/staging/vt6655/Kconfig"
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source "drivers/staging/vt6656/Kconfig"
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source "drivers/staging/udlfb/Kconfig"
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source "drivers/staging/hv/Kconfig"
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source "drivers/staging/vme/Kconfig"
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source "drivers/staging/rar_register/Kconfig"
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source "drivers/staging/memrar/Kconfig"
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source "drivers/staging/sep/Kconfig"
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source "drivers/staging/iio/Kconfig"
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source "drivers/staging/ramzswap/Kconfig"
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source "drivers/staging/wlags49_h2/Kconfig"
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source "drivers/staging/wlags49_h25/Kconfig"
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source "drivers/staging/batman-adv/Kconfig"
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source "drivers/staging/samsung-laptop/Kconfig"
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source "drivers/staging/strip/Kconfig"
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source "drivers/staging/arlan/Kconfig"
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source "drivers/staging/wavelan/Kconfig"
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source "drivers/staging/netwave/Kconfig"
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source "drivers/staging/sm7xx/Kconfig"
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source "drivers/staging/dt3155/Kconfig"
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source "drivers/staging/dt3155v4l/Kconfig"
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source "drivers/staging/crystalhd/Kconfig"
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source "drivers/staging/cxt1e1/Kconfig"
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source "drivers/staging/ti-st/Kconfig"
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endif # !STAGING_EXCLUDE_BUILD
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endif # STAGING
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