blob: e517011be4f964db7b452e1e50420eaed83f143d
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 | |
35 |