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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2007-04-24 11:48:13 -0300
committerLen Brown <len.brown@intel.com>2007-04-25 02:00:27 -0400
commit176750d68801bfa4a88d1cf54174aa0347d7e5d8 (patch)
treecb8cb70fcce9e6d7f2d9365635b2ec2856336ad2 /Documentation/thinkpad-acpi.txt
parent54ae15014c306b3d7ad32c996fea9a5ac8560b60 (diff)
ACPI: thinkpad-acpi: driver sysfs conversion
Add the sysfs attributes for the platform driver. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation/thinkpad-acpi.txt')
-rw-r--r--Documentation/thinkpad-acpi.txt42
1 files changed, 40 insertions, 2 deletions
diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt
index 0e4e053cface..cc079afaf66b 100644
--- a/Documentation/thinkpad-acpi.txt
+++ b/Documentation/thinkpad-acpi.txt
@@ -101,11 +101,39 @@ follow all sysfs guidelines and correctly process all errors (the sysfs
interface makes extensive use of errors). File descriptors and open /
close operations to the sysfs inodes must also be properly implemented.
-Driver version -- /proc/acpi/ibm/driver
----------------------------------------
+The version of thinkpad-acpi's sysfs interface is exported by the driver
+as a driver attribute (see below).
+
+Sysfs driver attributes are on the driver's sysfs attribute space,
+for 2.6.20 this is /sys/bus/platform/drivers/thinkpad-acpi/.
+
+Sysfs device attributes are on the driver's sysfs attribute space,
+for 2.6.20 this is /sys/devices/platform/thinkpad-acpi/.
+
+Driver version
+--------------
+
+procfs: /proc/acpi/ibm/driver
+sysfs driver attribute: version
The driver name and version. No commands can be written to this file.
+Sysfs interface version
+-----------------------
+
+sysfs driver attribute: interface_version
+
+Version of the thinkpad-acpi sysfs interface, as an unsigned long
+(output in hex format: 0xAAAABBCC), where:
+ AAAA - major revision
+ BB - minor revision
+ CC - bugfix revision
+
+The sysfs interface version changelog for the driver can be found at the
+end of this document. Changes to the sysfs interface done by the kernel
+subsystems are not documented here, nor are they tracked by this
+attribute.
+
Hot keys -- /proc/acpi/ibm/hotkey
---------------------------------
@@ -745,9 +773,19 @@ to enable more than one output class, just add their values.
There is also a kernel build option to enable more debugging
information, which may be necessary to debug driver problems.
+The level of debugging information output by the driver can be changed
+at runtime through sysfs, using the driver attribute debug_level. The
+attribute takes the same bitmask as the debug module parameter above.
+
Force loading of module
-----------------------
If thinkpad-acpi refuses to detect your ThinkPad, you can try to specify
the module parameter force_load=1. Regardless of whether this works or
not, please contact ibm-acpi-devel@lists.sourceforge.net with a report.
+
+
+Sysfs interface changelog:
+
+0x000100: Initial sysfs support, as a single platform driver and
+ device.