diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-21 12:03:10 -0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-21 12:03:10 -0400 |
commit | c720f5655df159a630fa0290a0bd67c93e92b0bf (patch) | |
tree | 940d139d0ec1ff5201efddef6cc663166a8a2df3 /Documentation/DocBook/v4l/dev-teletext.xml | |
parent | 33e6c1a0de818d3698cdab27c42915661011319d (diff) | |
parent | 84d6ae431f315e8973aac3c3fe1d550fc9240ef3 (diff) |
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (222 commits)
V4L/DVB (13033): pt1: Don't use a deprecated DMA_BIT_MASK macro
V4L/DVB (13029): radio-si4713: remove #include <linux/version.h>
V4L/DVB (13027): go7007: convert printks to v4l2_info
V4L/DVB (13026): s2250-board: Implement brightness and contrast controls
V4L/DVB (13025): s2250-board: Fix memory leaks
V4L/DVB (13024): go7007: Implement vidioc_g_std and vidioc_querystd
V4L/DVB (13023): go7007: Merge struct gofh and go declarations
V4L/DVB (13022): go7007: Fix mpeg controls
V4L/DVB (13021): go7007: Fix whitespace and line lengths
V4L/DVB (13020): go7007: Updates to Kconfig and Makefile
V4L/DVB (13019): video: initial support for ADV7180
V4L/DVB (13018): kzalloc failure ignored in au8522_probe()
V4L/DVB (13017): gspca: kmalloc failure ignored in sd_start()
V4L/DVB (13016): kmalloc failure ignored in lgdt3304_attach() and s921_attach()
V4L/DVB (13015): kmalloc failure ignored in m920x_firmware_download()
V4L/DVB (13014): Add support for Compro VideoMate E800 (DVB-T part only)
V4L/DVB (13013): FM TX: si4713: Kconfig: Fixed two typos.
V4L/DVB (13012): uvc: introduce missing kfree
V4L/DVB (13011): Change tuner type of BeholdTV cards
V4L/DVB (13009): gspca - stv06xx-hdcs: Reduce exposure range
...
Diffstat (limited to 'Documentation/DocBook/v4l/dev-teletext.xml')
-rw-r--r-- | Documentation/DocBook/v4l/dev-teletext.xml | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/Documentation/DocBook/v4l/dev-teletext.xml b/Documentation/DocBook/v4l/dev-teletext.xml new file mode 100644 index 000000000000..76184e8ed618 --- /dev/null +++ b/Documentation/DocBook/v4l/dev-teletext.xml | |||
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1 | <title>Teletext Interface</title> | ||
2 | |||
3 | <para>This interface aims at devices receiving and demodulating | ||
4 | Teletext data [<xref linkend="ets300706" />, <xref linkend="itu653" />], evaluating the | ||
5 | Teletext packages and storing formatted pages in cache memory. Such | ||
6 | devices are usually implemented as microcontrollers with serial | ||
7 | interface (I<superscript>2</superscript>C) and can be found on older | ||
8 | TV cards, dedicated Teletext decoding cards and home-brew devices | ||
9 | connected to the PC parallel port.</para> | ||
10 | |||
11 | <para>The Teletext API was designed by Martin Buck. It is defined in | ||
12 | the kernel header file <filename>linux/videotext.h</filename>, the | ||
13 | specification is available from <ulink url="ftp://ftp.gwdg.de/pub/linux/misc/videotext/"> | ||
14 | ftp://ftp.gwdg.de/pub/linux/misc/videotext/</ulink>. (Videotext is the name of | ||
15 | the German public television Teletext service.) Conventional character | ||
16 | device file names are <filename>/dev/vtx</filename> and | ||
17 | <filename>/dev/vttuner</filename>, with device number 83, 0 and 83, 16 | ||
18 | respectively. A similar interface exists for the Philips SAA5249 | ||
19 | Teletext decoder [specification?] with character device file names | ||
20 | <filename>/dev/tlkN</filename>, device number 102, N.</para> | ||
21 | |||
22 | <para>Eventually the Teletext API was integrated into the V4L API | ||
23 | with character device file names <filename>/dev/vtx0</filename> to | ||
24 | <filename>/dev/vtx31</filename>, device major number 81, minor numbers | ||
25 | 192 to 223. For reference the V4L Teletext API specification is | ||
26 | reproduced here in full: "Teletext interfaces talk the existing VTX | ||
27 | API." Teletext devices with major number 83 and 102 will be removed in | ||
28 | Linux 2.6.</para> | ||
29 | |||
30 | <para>There are no plans to replace the Teletext API or to integrate | ||
31 | it into V4L2. Please write to the linux-media mailing list: &v4l-ml; | ||
32 | when the need arises.</para> | ||
33 | |||
34 | <!-- | ||
35 | Local Variables: | ||
36 | mode: sgml | ||
37 | sgml-parent-document: "v4l2.sgml" | ||
38 | indent-tabs-mode: nil | ||
39 | End: | ||
40 | --> | ||