linux-kernel - Re: [patch 4/6] Add output class document

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Date:	Thu, 02 Nov 2006 15:04:29 +0100
From:	Timo Hoenig <thoenig@...se.net>
To:	Yu Luming <luming.yu@...il.com>
Cc:	Andrew Morton <akpm@...l.org>, Pavel Machek <pavel@....cz>,
	len.brown@...el.com, Matt Domsch <Matt_Domsch@...l.com>,
	Alessandro Guido <alessandro.guido@...il.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	jengelh@...ux01.gwdg.de, gelma@...ma.net, ismail@...dus.org.tr,
	Richard Hughes <hughsient@...il.com>
Subject: Re: [patch 4/6] Add output class document

Hi,

On Sat, 2006-11-04 at 21:22 +0800, Yu Luming wrote:

> diff --git a/Documentation/video-output.txt b/Documentation/video-output.txt
> new file mode 100644
> index 0000000..71b1dba
> --- /dev/null
> +++ b/Documentation/video-output.txt
> @@ -0,0 +1,34 @@
> +
> +		Video Output Switcher Control
> +		~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +		2006 luming.yu@...il.com
> +
> +The output sysfs class driver is to provide video output abstract 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 
> +aptop, acpi video driver registered its output devices and read/write method
> +for state with output sysfs class. The user interface under sysfs is :

Rephrased, s/Thinkpad/ThinkPad, s/aptop/laptop, s/acpi/ACPI, kill
whitespace in front of colon: 

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
devices through a common sysfs interface. For example, on my IBM ThinkPad T42 
laptop, the ACPI video driver registers its output devices and read/write methods
for 'state' with output sysfs class. The user interface under sysfs is:

The last but one sentence still sounds bogus to me, maybe someone else
has an idea.

> +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
> +

Thanks,

   Timo

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