ACPI: thinkpad-acpi: add debug mode

Add a debug mode parameter and verbose debug mode Kconfig option.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 4131a78..7fa906f 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -2684,6 +2684,9 @@
 static int experimental;
 module_param(experimental, int, 0);
 
+static u32 dbg_level;
+module_param_named(debug, dbg_level, uint, 0);
+
 #define IBM_PARAM(feature) \
 	module_param_call(feature, set_ibm_param, NULL, NULL, 0)