1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/usb/storage/debug.h b/drivers/usb/storage/debug.h
new file mode 100644
index 000000000..a6505ceb6
--- /dev/null
+++ b/drivers/usb/storage/debug.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Driver for USB Mass Storage compliant devices
+ * Debugging Functions Header File
+ *
+ * Current development and maintenance by:
+ *   (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
+ *
+ * Initial work by:
+ *   (c) 1999 Michael Gee (michael@linuxspecific.com)
+ *
+ * This driver is based on the 'USB Mass Storage Class' document. This
+ * describes in detail the protocol used to communicate with such
+ * devices.  Clearly, the designers had SCSI and ATAPI commands in
+ * mind when they created this document.  The commands are all very
+ * similar to commands in the SCSI-II and ATAPI specifications.
+ *
+ * It is important to note that in a number of cases this class
+ * exhibits class-specific exemptions from the USB specification.
+ * Notably the usage of NAK, STALL and ACK differs from the norm, in
+ * that they are used to communicate wait, failed and OK on commands.
+ *
+ * Also, for certain devices, the interrupt endpoint is used to convey
+ * status of a command.
+ */
+
+#ifndef _DEBUG_H_
+#define _DEBUG_H_
+
+#include <linux/kernel.h>
+
+#ifdef CONFIG_USB_STORAGE_DEBUG
+void usb_stor_show_command(const struct us_data *us, struct scsi_cmnd *srb);
+void usb_stor_show_sense(const struct us_data *us, unsigned char key,
+			 unsigned char asc, unsigned char ascq);
+__printf(2, 3) void usb_stor_dbg(const struct us_data *us,
+				 const char *fmt, ...);
+
+#define US_DEBUG(x)		x
+#else
+__printf(2, 3)
+static inline void _usb_stor_dbg(const struct us_data *us,
+				 const char *fmt, ...)
+{
+}
+#define usb_stor_dbg(us, fmt, ...)				\
+	do { if (0) _usb_stor_dbg(us, fmt, ##__VA_ARGS__); } while (0)
+#define US_DEBUG(x)
+#endif
+
+#endif