sony-laptop: documentation updates
Signed-off-by: Mattia Dongili <malattia@linux.it> Signed-off-by: Matthew Garrett <mjg@redhat.com>
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1 changed files with 30 additions and 7 deletions
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@ -14,7 +14,8 @@ Some models report hotkeys through the SNC or SPIC devices, such events are
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reported both through the ACPI subsystem as acpi events and through the INPUT
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subsystem. See the logs of acpid or /proc/acpi/event and
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/proc/bus/input/devices to find out what those events are and which input
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devices are created by the driver.
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devices are created by the driver. Additionally, loading the driver with the
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debug option will report all events in the kernel log.
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Backlight control:
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------------------
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@ -64,6 +65,16 @@ powers off the sound card,
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# echo "1" > /sys/devices/platform/sony-laptop/audiopower
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powers on the sound card.
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RFkill control:
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---------------
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More recent Vaio models expose a consistent set of ACPI methods to
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control radio frequency emitting devices. If you are a lucky owner of
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such a laptop you will find the necessary rfkill devices under
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/sys/class/rfkill. Check those starting with sony-* in
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# grep . /sys/class/rfkill/*/{state,name}
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Development:
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------------
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@ -75,8 +86,21 @@ pass the option 'debug=1'.
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REPEAT: DON'T DO THIS IF YOU DON'T LIKE RISKY BUSINESS.
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In your kernel logs you will find the list of all ACPI methods
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the SNC device has on your laptop. You can see the GCDP/GCDP methods
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used to pwer on/off the CD drive, but there are others.
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the SNC device has on your laptop.
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* For new models you will see a long list of meaningless method names,
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reading the DSDT table source should reveal that:
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(1) the SNC device uses an internal capability lookup table
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(2) SN00 is used to find values in the lookup table
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(3) SN06 and SN07 are used to call into the real methods based on
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offsets you can obtain iterating the table using SN00
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(4) SN02 used to enable events.
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Some values in the capability lookup table are more or less known, see
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the code for all sony_call_snc_handle calls, others are more obscure.
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* For old models you can see the GCDP/GCDP methods used to pwer on/off
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the CD drive, but there are others and they are usually different from
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model to model.
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I HAVE NO IDEA WHAT THOSE METHODS DO.
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@ -108,9 +132,8 @@ Bugs/Limitations:
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laptop, including permanent damage.
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* The sony-laptop and sonypi drivers do not interact at all. In the
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future, sonypi could use sony-laptop to do (part of) its business.
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future, sonypi will be removed and replaced by sony-laptop.
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* spicctrl, which is the userspace tool used to communicate with the
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sonypi driver (through /dev/sonypi) does not try to use the
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sony-laptop driver. In the future, spicctrl could try sonypi first,
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and if it isn't present, try sony-laptop instead.
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sonypi driver (through /dev/sonypi) is deprecated as well since all
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its features are now available under the sysfs tree via sony-laptop.
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