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sony-laptop: documentation updates 

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Mattia Dongili 2011-02-19 11:52:26 +09:00 committed by Matthew Garrett
parent 56e6e716b5
commit 54286fd0da
1 changed files with 30 additions and 7 deletions
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37
Documentation/laptops/sony-laptop.txt
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@ -14,7 +14,8 @@ 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.
devices are created by the driver. Additionally, loading the driver with the
debug option will report all events in the kernel log.
Backlight control:
------------------
@ -64,6 +65,16 @@ powers off the sound card,
# echo "1" > /sys/devices/platform/sony-laptop/audiopower
powers on the sound card.
RFkill control:
---------------
More recent Vaio models expose a consistent set of ACPI methods to
control radio frequency emitting devices. If you are a lucky owner of
such a laptop you will find the necessary rfkill devices under
/sys/class/rfkill. Check those starting with sony-* in
# grep . /sys/class/rfkill/*/{state,name}
Development:
------------
@ -75,8 +86,21 @@ 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.
the SNC device has on your laptop.
* For new models you will see a long list of meaningless method names,
reading the DSDT table source should reveal that:
(1) the SNC device uses an internal capability lookup table
(2) SN00 is used to find values in the lookup table
(3) SN06 and SN07 are used to call into the real methods based on
offsets you can obtain iterating the table using SN00
(4) SN02 used to enable events.
Some values in the capability lookup table are more or less known, see
the code for all sony_call_snc_handle calls, others are more obscure.
* For old models you can see the GCDP/GCDP methods used to pwer on/off
the CD drive, but there are others and they are usually different from
model to model.
I HAVE NO IDEA WHAT THOSE METHODS DO.
@ -108,9 +132,8 @@ Bugs/Limitations:
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.
future, sonypi will be removed and replaced by sony-laptop.
* 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.
sonypi driver (through /dev/sonypi) is deprecated as well since all
its features are now available under the sysfs tree via sony-laptop.