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ACPI: thinkpad-acpi: export to sysfs the state of the radio slider switch

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Some ThinkPad models, notably the T60 and X60, have a slider switch to
enable and disable the radios.  The switch has the capability of
force-disabling the radios in hardware on most models, and it is supposed
to affect all radios (WLAN, WWAN, BlueTooth).

Export the switch state as a sysfs attribute, on ThinkPads where it is
available.

Thanks to Henning Schild for asking for this feature, and for tracking down
the EC register that holds the radio switch state.

Signed-off-by: Henrique de Moraes Holschuh <[email protected]>
Cc: Henning Schild <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Henrique de Moraes Holschuh 2007-07-18 23:45:31 -03:00 • committed by Len Brown
commit 74941a69af
3 changed files with 43 additions and 2 deletions
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6
Documentation/thinkpad-acpi.txt
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@ -227,6 +227,12 @@ sysfs notes:
supported hot keys, except those which are handled by
the firmware. Echo it to hotkey_mask above, to use.
hotkey_radio_sw:
if the ThinkPad has a hardware radio switch, this
attribute will read 0 if the switch is in the "radios
disabled" postition, and 1 if the switch is in the
"radios enabled" position.
Bluetooth
---------