1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/misc/acer-wmi.c b/drivers/misc/acer-wmi.c
index dd0b8d8b5bd9..d8b8574e303c 100644
--- a/drivers/misc/acer-wmi.c
+++ b/drivers/misc/acer-wmi.c
@@ -35,6 +35,7 @@
 #include <linux/platform_device.h>
 #include <linux/acpi.h>
 #include <linux/i8042.h>
+#include <linux/debugfs.h>
 
 #include <acpi/acpi_drivers.h>
 
@@ -152,6 +153,12 @@ struct acer_data {
         int brightness;
 };
 
+struct acer_debug {
+        struct dentry *root;
+        struct dentry *devices;
+        u32 wmid_devices;
+};
+
 /* Each low-level interface must define at least some of the following */
 struct wmi_interface {
         /* The WMI device type */
@@ -162,6 +169,9 @@ struct wmi_interface {
 
         /* Private data for the current interface */
         struct acer_data data;
+
+        /* debugfs entries associated with this interface */
+        struct acer_debug debug;
 };
 
 /* The static interface pointer, points to the currently detected interface */
@@ -956,6 +966,28 @@ static DEVICE_ATTR(interface, S_IWUGO | S_IRUGO | S_IWUSR,
         show_interface, NULL);
 
 /*
+ * debugfs functions
+ */
+static u32 get_wmid_devices(void)
+{
+        struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
+        union acpi_object *obj;
+        acpi_status status;
+
+        status = wmi_query_block(WMID_GUID2, 1, &out);
+        if (ACPI_FAILURE(status))
+                return 0;
+
+        obj = (union acpi_object *) out.pointer;
+        if (obj && obj->type == ACPI_TYPE_BUFFER &&
+                obj->buffer.length == sizeof(u32)) {
+                return *((u32 *) obj->buffer.pointer);
+        } else {
+                return 0;
+        }
+}
+
+/*
  * Platform device
  */
 static int __devinit acer_platform_probe(struct platform_device *device)
@@ -1114,6 +1146,33 @@ error_sysfs:
         return retval;
 }
 
+static void remove_debugfs(void)
+{
+        debugfs_remove(interface->debug.devices);
+        debugfs_remove(interface->debug.root);
+}
+
+static int create_debugfs(void)
+{
+        interface->debug.root = debugfs_create_dir("acer-wmi", NULL);
+        if (!interface->debug.root) {
+                printk(ACER_ERR "Failed to create debugfs directory");
+                return -ENOMEM;
+        }
+
+        interface->debug.devices = debugfs_create_u32("devices", S_IRUGO,
+                                        interface->debug.root,
+                                        &interface->debug.wmid_devices);
+        if (!interface->debug.devices)
+                goto error_debugfs;
+
+        return 0;
+
+error_debugfs:
+                remove_debugfs();
+        return -ENOMEM;
+}
+
 static int __init acer_wmi_init(void)
 {
         int err;
@@ -1173,6 +1232,13 @@ static int __init acer_wmi_init(void)
         if (err)
                 return err;
 
+        if (wmi_has_guid(WMID_GUID2)) {
+                interface->debug.wmid_devices = get_wmid_devices();
+                err = create_debugfs();
+                if (err)
+                        return err;
+        }
+
         /* Override any initial settings with values from the commandline */
         acer_commandline_init();