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LXR

 
 

    


0001 
0002                 Video Output Switcher Control
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