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authorYu Luming <luming.yu@gmail.com>2006-12-19 15:56:18 -0500
committerLen Brown <len.brown@intel.com>2006-12-20 01:46:58 -0500
commitb03637b8863159a4518cb0a9ab90577460fe3417 (patch)
tree2fee495630226adcffeec20f47d1254aaccdc23e
parent2dec3ba8d872aa3ffbcdb8f6f8a2c0bcd44e9910 (diff)
output: Add output class document
Signed-off-by: Luming Yu <Luming.yu@intel.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
-rw-r--r--Documentation/video-output.txt34
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1
2 Video Output Switcher Control
3 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 2006 luming.yu@intel.com
5
6The output sysfs class driver provides an abstract video output layer that
7can be used to hook platform specific methods to enable/disable video output
8device through common sysfs interface. For example, on my IBM ThinkPad T42
9laptop, The ACPI video driver registered its output devices and read/write
10method for 'state' with output sysfs class. The user interface under sysfs is:
11
12linux:/sys/class/video_output # tree .
13.
14|-- CRT0
15| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
16| |-- state
17| |-- subsystem -> ../../../class/video_output
18| `-- uevent
19|-- DVI0
20| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
21| |-- state
22| |-- subsystem -> ../../../class/video_output
23| `-- uevent
24|-- LCD0
25| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
26| |-- state
27| |-- subsystem -> ../../../class/video_output
28| `-- uevent
29`-- TV0
30 |-- device -> ../../../devices/pci0000:00/0000:00:01.0
31 |-- state
32 |-- subsystem -> ../../../class/video_output
33 `-- uevent
34