2.6.25-rc2

 Documentation

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-Sony Notebook Control Driver (SNC) Readme
------------------------------------------
-   Copyright (C) 2004- 2005 Stelian Pop <stelian@popies.net>
-   Copyright (C) 2007 Mattia Dongili <malattia@linux.it>
-
-This mini-driver drives the SNC and SPIC device present in the ACPI BIOS of the
-Sony Vaio laptops. This driver mixes both devices functions under the same
-(hopefully consistent) interface. This also means that the sonypi driver is
-obsoleted by sony-laptop now.
-
-Fn keys (hotkeys):
-------------------
-Some models report hotkeys through the SNC or SPIC devices, such events are
-reported both through the ACPI subsystem as acpi events and through the INPUT
-subsystem. See the logs of acpid or /proc/acpi/event and
-/proc/bus/input/devices to find out what those events are and which input
-devices are created by the driver.
-
-Backlight control:
-------------------
-If your laptop model supports it, you will find sysfs files in the
-/sys/class/backlight/sony/
-directory. You will be able to query and set the current screen
-brightness:
-   brightness      get/set screen brightness (an iteger
-            between 0 and 7)
-   actual_brightness   reading from this file will query the HW
-            to get real brightness value
-   max_brightness      the maximum brightness value
-
-
-Platform specific:
-------------------
-Loading the sony-laptop module will create a
-/sys/devices/platform/sony-laptop/
-directory populated with some files.
-
-You then read/write integer values from/to those files by using
-standard UNIX tools.
-
-The files are:
-   brightness_default   screen brightness which will be set
-            when the laptop will be rebooted
-   cdpower         power on/off the internal CD drive
-   audiopower      power on/off the internal sound card
-   lanpower      power on/off the internal ethernet card
-            (only in debug mode)
-   bluetoothpower      power on/off the internal bluetooth device
-   fanspeed      get/set the fan speed
-
-Note that some files may be missing if they are not supported
-by your particular laptop model.
-
-Example usage:
-   # echo "1" > /sys/devices/platform/sony-laptop/brightness_default
-sets the lowest screen brightness for the next and later reboots,
-   # echo "8" > /sys/devices/platform/sony-laptop/brightness_default
-sets the highest screen brightness for the next and later reboots,
-   # cat /sys/devices/platform/sony-laptop/brightness_default
-retrieves the value.
-
-   # echo "0" > /sys/devices/platform/sony-laptop/audiopower
-powers off the sound card,
-   # echo "1" > /sys/devices/platform/sony-laptop/audiopower
-powers on the sound card.
-
-Development:
-------------
-
-If you want to help with the development of this driver (and
-you are not afraid of any side effects doing strange things with
-your ACPI BIOS could have on your laptop), load the driver and
-pass the option 'debug=1'.
-
-REPEAT: DON'T DO THIS IF YOU DON'T LIKE RISKY BUSINESS.
-
-In your kernel logs you will find the list of all ACPI methods
-the SNC device has on your laptop. You can see the GCDP/GCDP methods
-used to pwer on/off the CD drive, but there are others.
-
-I HAVE NO IDEA WHAT THOSE METHODS DO.
-
-The sony-laptop driver creates, for some of those methods (the most
-current ones found on several Vaio models), an entry under
-/sys/devices/platform/sony-laptop, just like the 'cdpower' one.
-You can create other entries corresponding to your own laptop methods by
-further editing the source (see the 'sony_nc_values' table, and add a new
-entry to this table with your get/set method names using the
-SNC_HANDLE_NAMES macro).
-
-Your mission, should you accept it, is to try finding out what
-those entries are for, by reading/writing random values from/to those
-files and find out what is the impact on your laptop.
-
-Should you find anything interesting, please report it back to me,
-I will not disavow all knowledge of your actions :)
-
-See also http://www.linux.it/~malattia/wiki/index.php/Sony_drivers for other
-useful info.
-
-Bugs/Limitations:
------------------
-
-* This driver is not based on official documentation from Sony
-  (because there is none), so there is no guarantee this driver
-  will work at all, or do the right thing. Although this hasn't
-  happened to me, this driver could do very bad things to your
-  laptop, including permanent damage.
-
-* The sony-laptop and sonypi drivers do not interact at all. In the
-  future, sonypi could use sony-laptop to do (part of) its business.
-
-* spicctrl, which is the userspace tool used to communicate with the
-  sonypi driver (through /dev/sonypi) does not try to use the
-  sony-laptop driver. In the future, spicctrl could try sonypi first,
-  and if it isn't present, try sony-laptop instead.
-