1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/acpi/debug.c b/drivers/acpi/debug.c
index bf513e07b773..6df564f4ca6e 100644
--- a/drivers/acpi/debug.c
+++ b/drivers/acpi/debug.c
@@ -130,6 +130,63 @@ static int param_get_debug_level(char *buffer, struct kernel_param *kp) {
 module_param_call(debug_layer, param_set_uint, param_get_debug_layer, &acpi_dbg_layer, 0644);
 module_param_call(debug_level, param_set_uint, param_get_debug_level, &acpi_dbg_level, 0644);
 
+static char trace_method_name[6];
+module_param_string(trace_method_name, trace_method_name, 6, 0644);
+static unsigned int trace_debug_layer;
+module_param(trace_debug_layer, uint, 0644);
+static unsigned int trace_debug_level;
+module_param(trace_debug_level, uint, 0644);
+
+static int param_set_trace_state(const char *val, struct kernel_param *kp)
+{
+        int result = 0;
+
+        if (!strncmp(val, "enable", strlen("enable") - 1)) {
+                result = acpi_debug_trace(trace_method_name, trace_debug_level,
+                                          trace_debug_layer, 0);
+                if (result)
+                        result = -EBUSY;
+                goto exit;
+        }
+
+        if (!strncmp(val, "disable", strlen("disable") - 1)) {
+                int name = 0;
+                result = acpi_debug_trace((char *)&name, trace_debug_level,
+                                          trace_debug_layer, 0);
+                if (result)
+                        result = -EBUSY;
+                goto exit;
+        }
+
+        if (!strncmp(val, "1", 1)) {
+                result = acpi_debug_trace(trace_method_name, trace_debug_level,
+                                          trace_debug_layer, 1);
+                if (result)
+                        result = -EBUSY;
+                goto exit;
+        }
+
+        result = -EINVAL;
+exit:
+        return result;
+}
+
+static int param_get_trace_state(char *buffer, struct kernel_param *kp)
+{
+        if (!acpi_gbl_trace_method_name)
+                return sprintf(buffer, "disable");
+        else {
+                if (acpi_gbl_trace_flags & 1)
+                        return sprintf(buffer, "1");
+                else
+                        return sprintf(buffer, "enable");
+        }
+        return 0;
+}
+
+module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
+                  NULL, 0644);
+
 /* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */