linux-imx

​

        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

​