+static int debug_close(struct inode *inode, struct file *file)
+{
+ struct debug_buffer *buf = file->private_data;
+
+ if (buf) {
+ if (buf->page)
+ free_page((unsigned long)buf->page);
+ kfree(buf);
+ }
+
+ return 0;
+}
+
+static int debug_async_open(struct inode *inode, struct file *file)
+{
+ file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
+
+ return file->private_data ? 0 : -ENOMEM;
+}
+
+static int debug_periodic_open(struct inode *inode, struct file *file)
+{
+ file->private_data = alloc_buffer(inode->i_private,
+ fill_periodic_buffer);
+
+ return file->private_data ? 0 : -ENOMEM;
+}
+
+static int debug_registers_open(struct inode *inode, struct file *file)
+{
+ file->private_data = alloc_buffer(inode->i_private,
+ fill_registers_buffer);
+
+ return file->private_data ? 0 : -ENOMEM;
+}
+
+static inline void create_debug_files(struct admhcd *ahcd)
+{
+ struct usb_bus *bus = &admhcd_to_hcd(ahcd)->self;
+ struct device *dev = bus->dev;
+
+ ahcd->debug_dir = debugfs_create_dir(bus->bus_name, admhc_debug_root);
+ if (!ahcd->debug_dir)
+ goto dir_error;
+
+ ahcd->debug_async = debugfs_create_file("async", S_IRUGO,
+ ahcd->debug_dir, dev,
+ &debug_async_fops);
+ if (!ahcd->debug_async)
+ goto async_error;
+
+ ahcd->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
+ ahcd->debug_dir, dev,
+ &debug_periodic_fops);
+ if (!ahcd->debug_periodic)
+ goto periodic_error;
+
+ ahcd->debug_registers = debugfs_create_file("registers", S_IRUGO,
+ ahcd->debug_dir, dev,
+ &debug_registers_fops);
+ if (!ahcd->debug_registers)
+ goto registers_error;
+
+ admhc_dbg(ahcd, "created debug files\n");
+ return;
+
+registers_error:
+ debugfs_remove(ahcd->debug_periodic);
+periodic_error:
+ debugfs_remove(ahcd->debug_async);
+async_error:
+ debugfs_remove(ahcd->debug_dir);
+dir_error:
+ ahcd->debug_periodic = NULL;
+ ahcd->debug_async = NULL;
+ ahcd->debug_dir = NULL;
+}
+
+static inline void remove_debug_files(struct admhcd *ahcd)
+{
+ debugfs_remove(ahcd->debug_registers);
+ debugfs_remove(ahcd->debug_periodic);
+ debugfs_remove(ahcd->debug_async);
+ debugfs_remove(ahcd->debug_dir);