mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 12:09:34 +00:00
b03637b886
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>
35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
Plaintext
|
|
Video Output Switcher Control
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
2006 luming.yu@intel.com
|
|
|
|
The output sysfs class driver provides an abstract video output layer that
|
|
can be used to hook platform specific methods to enable/disable video output
|
|
device through common sysfs interface. For example, on my IBM ThinkPad T42
|
|
laptop, The ACPI video driver registered its output devices and read/write
|
|
method for 'state' with output sysfs class. The user interface under sysfs is:
|
|
|
|
linux:/sys/class/video_output # tree .
|
|
.
|
|
|-- CRT0
|
|
| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
|
|
| |-- state
|
|
| |-- subsystem -> ../../../class/video_output
|
|
| `-- uevent
|
|
|-- DVI0
|
|
| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
|
|
| |-- state
|
|
| |-- subsystem -> ../../../class/video_output
|
|
| `-- uevent
|
|
|-- LCD0
|
|
| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
|
|
| |-- state
|
|
| |-- subsystem -> ../../../class/video_output
|
|
| `-- uevent
|
|
`-- TV0
|
|
|-- device -> ../../../devices/pci0000:00/0000:00:01.0
|
|
|-- state
|
|
|-- subsystem -> ../../../class/video_output
|
|
`-- uevent
|
|
|