0001 Video Output Switcher Control
0002 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0003
0004 2006 luming.yu@intel.com
0005
0006 The output sysfs class driver provides an abstract video output layer that
0007 can be used to hook platform specific methods to enable/disable video output
0008 device through common sysfs interface. For example, on my IBM ThinkPad T42
0009 laptop, The ACPI video driver registered its output devices and read/write
0010 method for 'state' with output sysfs class. The user interface under sysfs is::
0011
0012 linux:/sys/class/video_output # tree .
0013 .
0014 |-- CRT0
0015 | |-- device -> ../../../devices/pci0000:00/0000:00:01.0
0016 | |-- state
0017 | |-- subsystem -> ../../../class/video_output
0018 | `-- uevent
0019 |-- DVI0
0020 | |-- device -> ../../../devices/pci0000:00/0000:00:01.0
0021 | |-- state
0022 | |-- subsystem -> ../../../class/video_output
0023 | `-- uevent
0024 |-- LCD0
0025 | |-- device -> ../../../devices/pci0000:00/0000:00:01.0
0026 | |-- state
0027 | |-- subsystem -> ../../../class/video_output
0028 | `-- uevent
0029 `-- TV0
0030 |-- device -> ../../../devices/pci0000:00/0000:00:01.0
0031 |-- state
0032 |-- subsystem -> ../../../class/video_output
0033 `-- uevent
0034
