From: Yu Luming <luming.yu@gmail.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Pavel Machek <pavel@ucw.cz>,
len.brown@intel.com, Matt Domsch <Matt_Domsch@dell.com>,
Alessandro Guido <alessandro.guido@gmail.com>,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
jengelh@linux01.gwdg.de, gelma@gelma.net, ismail@pardus.org.tr,
Richard Hughes <hughsient@gmail.com>
Subject: [patch 4/5] Add output class document
Date: Wed, 8 Nov 2006 00:54:52 +0800 [thread overview]
Message-ID: <200611080054.53220.luming.yu@gmail.com> (raw)
Patch 4/5: add output class document
signed-off-by: Luming Yu <Luming.yu@intel.com>
---
video-output.txt | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/Documentation/video-output.txt b/Documentation/video-output.txt
new file mode 100644
index 0000000..cf0f3c2
--- /dev/null
+++ b/Documentation/video-output.txt
@@ -0,0 +1,34 @@
+
+ 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
+
reply other threads:[~2006-11-07 17:06 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200611080054.53220.luming.yu@gmail.com \
--to=luming.yu@gmail.com \
--cc=Matt_Domsch@dell.com \
--cc=akpm@osdl.org \
--cc=alessandro.guido@gmail.com \
--cc=gelma@gelma.net \
--cc=hughsient@gmail.com \
--cc=ismail@pardus.org.tr \
--cc=jengelh@linux01.gwdg.de \
--cc=len.brown@intel.com \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pavel@ucw.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox