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| 1 | |||
| 2 | Video Output Switcher Control | ||
| 3 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
| 4 | 2006 luming.yu@intel.com | ||
| 5 | |||
| 6 | The output sysfs class driver provides an abstract video output layer that | ||
| 7 | can be used to hook platform specific methods to enable/disable video output | ||
| 8 | device through common sysfs interface. For example, on my IBM ThinkPad T42 | ||
| 9 | laptop, The ACPI video driver registered its output devices and read/write | ||
| 10 | method for 'state' with output sysfs class. The user interface under sysfs is: | ||
| 11 | |||
| 12 | linux:/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 | |||