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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2008-02-16 02:17:58 -0200
committerLen Brown <len.brown@intel.com>2008-02-16 00:34:06 -0500
commit6c231bd5eb07ce546517019f334652b9ecfc329a (patch)
tree4fcb81f506a0a6591e2a5870fce855bbc2582291 /Documentation/laptops
parentd147da73c9a3f617e4685c6a7762961fe19833e7 (diff)
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ACPI: thinkpad-acpi: add tablet-mode reporting
A quick study of the 0x5009/0x500A HKEY event on the X61t DSDT revealed the existence of the EC HTAB register (EC 0x0f, bit 7), and a compare with the X41t DSDT shows that HKEY.MHKG can be used to verify if the ThinkPad is tablet-capable (MHKG present), and in tablet mode (bit 3 of MHKG return is set). Add an attribute to report this information, "hotkey_tablet_mode". This attribute has poll()/select() support, and can be used along with EV_SW SW_TABLET_MODE to hook userspace to tablet events. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation/laptops')
-rw-r--r--Documentation/laptops/thinkpad-acpi.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index 606af1628382..76cb428435da 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -313,6 +313,13 @@ sysfs notes:
This attribute has poll()/select() support.
+ hotkey_tablet_mode:
+ If the ThinkPad has tablet capabilities, this attribute
+ will read 0 if the ThinkPad is in normal mode, and
+ 1 if the ThinkPad is in tablet mode.
+
+ This attribute has poll()/select() support.
+
hotkey_report_mode:
Returns the state of the procfs ACPI event report mode
filter for hot keys. If it is set to 1 (the default),
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