uas: Add the posibilty to blacklist uas devices from using the uas driver

Once we start supporting uas hardware, and as more and more uas devices
become available, we will likely start seeing broken devices. This patch
prepares for the inevitable need for blacklisting those devices from
using the uas driver (they will use usb-storage instead).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

4 files changed, 80 insertions, 6 deletions

diff --git a/drivers/usb/storage/uas-detect.h b/drivers/usb/storage/uas-detect.h
index 28101c7e6a9f..02bf5ec957f5 100644
--- a/drivers/usb/storage/uas-detect.h
+++ b/drivers/usb/storage/uas-detect.h
@@ -38,3 +38,14 @@ static int uas_find_uas_alt_setting(struct usb_interface *intf)
 
 	return -ENODEV;
 }
+
+static int uas_use_uas_driver(struct usb_interface *intf,
+			      const struct usb_device_id *id)
+{
+	unsigned long flags = id->driver_info;
+
+	if (flags & US_FL_IGNORE_UAS)
+		return 0;
+
+	return uas_find_uas_alt_setting(intf) >= 0;
+}
diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 6ea892f32f74..e817e72d8673 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -13,6 +13,7 @@
 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/usb.h>
+#include <linux/usb_usual.h>
 #include <linux/usb/hcd.h>
 #include <linux/usb/storage.h>
 #include <linux/usb/uas.h>
@@ -866,7 +867,14 @@ static struct scsi_host_template uas_host_template = {
 	.ordered_tag = 1,
 };
 
+#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
+		    vendorName, productName, useProtocol, useTransport, \
+		    initFunction, flags) \
+{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
+	.driver_info = (flags) }
+
 static struct usb_device_id uas_usb_ids[] = {
+#	include "unusual_uas.h"
 	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
 	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
 	/* 0xaa is a prototype device I happen to have access to */
@@ -875,6 +883,8 @@ static struct usb_device_id uas_usb_ids[] = {
 };
 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
 
+#undef UNUSUAL_DEV
+
 static int uas_switch_interface(struct usb_device *udev,
 				struct usb_interface *intf)
 {
@@ -973,6 +983,9 @@ static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	struct uas_dev_info *devinfo;
 	struct usb_device *udev = interface_to_usbdev(intf);
 
+	if (!uas_use_uas_driver(intf, id))
+		return -ENODEV;
+
 	if (uas_switch_interface(udev, intf))
 		return -ENODEV;
 
@@ -1083,10 +1096,6 @@ static void uas_disconnect(struct usb_interface *intf)
 	kfree(devinfo);
 }
 
-/*
- * XXX: Should this plug into libusual so we can auto-upgrade devices from
- * Bulk-Only to UAS?
- */
 static struct usb_driver uas_driver = {
 	.name = "uas",
 	.probe = uas_probe,
diff --git a/drivers/usb/storage/unusual_uas.h b/drivers/usb/storage/unusual_uas.h
new file mode 100644
index 000000000000..7244444df8ee
--- /dev/null
+++ b/drivers/usb/storage/unusual_uas.h
@@ -0,0 +1,52 @@
+/* Driver for USB Attached SCSI devices - Unusual Devices File
+ *
+ *   (c) 2013 Hans de Goede <hdegoede@redhat.com>
+ *
+ * Based on the same file for the usb-storage driver, which is:
+ *   (c) 2000-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
+ *   (c) 2000 Adam J. Richter (adam@yggdrasil.com), Yggdrasil Computing, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ * IMPORTANT NOTE: This file must be included in another file which defines
+ * a UNUSUAL_DEV macro before this file is included.
+ */
+
+/*
+ * If you edit this file, please try to keep it sorted first by VendorID,
+ * then by ProductID.
+ *
+ * If you want to add an entry for this file, be sure to include the
+ * following information:
+ *	- a patch that adds the entry for your device, including your
+ *	  email address right above the entry (plus maybe a brief
+ *	  explanation of the reason for the entry),
+ *	- lsusb -v output for the device
+ * Send your submission to Hans de Goede <hdegoede@redhat.com>
+ * and don't forget to CC: the USB development list <linux-usb@vger.kernel.org>
+ */
+
+/*
+ * This is an example entry for the US_FL_IGNORE_UAS flag. Once we have an
+ * actual entry using US_FL_IGNORE_UAS this entry should be removed.
+ *
+ * UNUSUAL_DEV(  0xabcd, 0x1234, 0x0100, 0x0100,
+ *		"Example",
+ *		"Storage with broken UAS",
+ *		USB_SC_DEVICE, USB_PR_DEVICE, NULL,
+ *		US_FL_IGNORE_UAS),
+ */
diff --git a/include/linux/usb_usual.h b/include/linux/usb_usual.h
index 630356866030..1a64b26046ed 100644
--- a/include/linux/usb_usual.h
+++ b/include/linux/usb_usual.h
@@ -67,8 +67,10 @@
 		/* Initial READ(10) (and others) must be retried */	\
 	US_FLAG(WRITE_CACHE,	0x00200000)			\
 		/* Write Cache status is not available */	\
-	US_FLAG(NEEDS_CAP16,	0x00400000)
-		/* cannot handle READ_CAPACITY_10 */
+	US_FLAG(NEEDS_CAP16,	0x00400000)			\
+		/* cannot handle READ_CAPACITY_10 */		\
+	US_FLAG(IGNORE_UAS,	0x00800000)			\
+		/* Device advertises UAS but it is broken */
 
 #define US_FLAG(name, value)	US_FL_##name = value ,
 enum { US_DO_ALL_FLAGS };