ACPI: thinkpad-acpi: add subdriver debug statements

Add debug messages to the subdriver initialization and exit code.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt
index 82fd822..20d5ec3 100644
--- a/Documentation/thinkpad-acpi.txt
+++ b/Documentation/thinkpad-acpi.txt
@@ -710,5 +710,9 @@
 will enable all debugging output classes.  It takes a bitmask, so
 to enable more than one output class, just add their values.
 
+	Debug bitmask		Description
+	0x0001			Initialization and probing
+	0x0002			Removal
+
 There is also a kernel build option to enable more debugging
 information, which may be necessary to debug driver problems.