Re: RFC drivers/usb/storage/libusual

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On Wed, 28 Sep 2005 01:52:00 -0700, Greg KH <[email protected]> wrote:

> Your patch mixes a few things in that you probably don't need to show
> how libusual works which bloat the patch.  The unusual_devs.h rework
> comes to mind.

>   - This only covers the "which module to load" question.  Once the
>     module is loaded, it still always grabs the storage devices, even if
>     another module is loaded later on.  Isn't that still the same issue
>     we have today?  Can't we fix this too?

>   - request_module() is icky.  I keep wanting to get rid of that
>     function, and really don't want to see any further users get added.
>     But that's just my feeling, if there's no other way to do this, I
>     don't mind.

I addressed the first two concens. The usb-storage gets to keep its 1:1
relation between the two arrays, and the missing checks for device type
are added. But unfortunately, request_module() is an intrinsic part
of the beast...

So, here it goes. I tested it to build and work with libusual enabled
and disabled, by attaching devices which are on the old "unusual" list
and generic devices. But it's quite possible that I'm missing something,
so if anyone could give it a try, or review again, that would be great.

The old patch had some silly bugs in it. I guess I was too excited and
did not test it thoroughly enough. For example:

+	spin_lock_irqsave(&usu_lock, flags);
+	if ((stat[type].fls & (USU_MOD_FL_THREAD|USU_MOD_FL_PRESENT)) != 0) {
+		spin_lock_irqsave(&usu_lock, flags);    <===== Lock again?
+		return -ENXIO;
+	}
+	stat[type].fls |= USU_MOD_FL_THREAD;
+	spin_unlock_irqrestore(&usu_lock, flags);

That's the kind of thing I let happen in my patches, so beware :-)

Greetings,
-- Pete

diff -urpN -X dontdiff linux-2.6.14-rc2/drivers/block/Kconfig linux-2.6.14-rc2-wip/drivers/block/Kconfig
--- linux-2.6.14-rc2/drivers/block/Kconfig	2005-09-24 20:32:32.000000000 -0700
+++ linux-2.6.14-rc2-wip/drivers/block/Kconfig	2005-09-26 00:27:56.000000000 -0700
@@ -358,7 +358,8 @@ config BLK_DEV_UB
 	  This driver supports certain USB attached storage devices
 	  such as flash keys.
 
-	  Warning: Enabling this cripples the usb-storage driver.
+	  If you enable this driver, it is recommended to avoid conflicts
+	  with usb-storage by enabling USB_LIBUSUAL.
 
 	  If unsure, say N.
 
diff -urpN -X dontdiff linux-2.6.14-rc2/drivers/block/ub.c linux-2.6.14-rc2-wip/drivers/block/ub.c
--- linux-2.6.14-rc2/drivers/block/ub.c	2005-09-24 20:32:33.000000000 -0700
+++ linux-2.6.14-rc2-wip/drivers/block/ub.c	2005-09-28 16:43:41.000000000 -0700
@@ -29,6 +29,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/usb.h>
+#include <linux/usb_usual.h>
 #include <linux/blkdev.h>
 #include <linux/devfs_fs_kernel.h>
 #include <linux/timer.h>
@@ -110,11 +111,13 @@
  * Definitions which have to be scattered once we understand the layout better.
  */
 
+#if 0 /* Subclass and protocol are in usb_usual.h now. */
 /* Transport (despite PR in the name) */
 #define US_PR_BULK	0x50		/* bulk only */
 
 /* Protocol */
 #define US_SC_SCSI	0x06		/* Transparent */
+#endif
 
 /*
  * This many LUNs per USB device.
@@ -422,13 +425,18 @@ static int ub_probe_lun(struct ub_dev *s
 
 /*
  */
+#ifdef CONFIG_USB_LIBUSUAL
+
+#define ub_usb_ids  storage_usb_ids
+#else
+
 static struct usb_device_id ub_usb_ids[] = {
-	// { USB_DEVICE_VER(0x0781, 0x0002, 0x0009, 0x0009) },	/* SDDR-31 */
 	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) },
 	{ }
 };
 
 MODULE_DEVICE_TABLE(usb, ub_usb_ids);
+#endif /* CONFIG_USB_LIBUSUAL */
 
 /*
  * Find me a way to identify "next free minor" for add_disk(),
@@ -2168,6 +2176,9 @@ static int ub_probe(struct usb_interface
 	int rc;
 	int i;
 
+	if (USB_US_TYPE(dev_id->driver_info) != USB_US_TYPE_UB)
+		return -ENXIO;
+
 	rc = -ENOMEM;
 	if ((sc = kmalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL)
 		goto err_core;
@@ -2466,8 +2477,7 @@ static int __init ub_init(void)
 {
 	int rc;
 
-	/* P3 */ printk("ub: sizeof ub_scsi_cmd %zu ub_dev %zu ub_lun %zu\n",
-			sizeof(struct ub_scsi_cmd), sizeof(struct ub_dev), sizeof(struct ub_lun));
+	usb_usual_set_present(USB_US_TYPE_UB, 1);
 
 	if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0)
 		goto err_regblkdev;
@@ -2482,6 +2492,8 @@ err_register:
 	devfs_remove(DEVFS_NAME);
 	unregister_blkdev(UB_MAJOR, DRV_NAME);
 err_regblkdev:
+
+	usb_usual_set_present(USB_US_TYPE_UB, 0);
 	return rc;
 }
 
@@ -2491,6 +2503,7 @@ static void __exit ub_exit(void)
 
 	devfs_remove(DEVFS_NAME);
 	unregister_blkdev(UB_MAJOR, DRV_NAME);
+	usb_usual_set_present(USB_US_TYPE_UB, 0);
 }
 
 module_init(ub_init);
diff -urpN -X dontdiff linux-2.6.14-rc2/drivers/usb/storage/Kconfig linux-2.6.14-rc2-wip/drivers/usb/storage/Kconfig
--- linux-2.6.14-rc2/drivers/usb/storage/Kconfig	2005-09-24 20:32:55.000000000 -0700
+++ linux-2.6.14-rc2-wip/drivers/usb/storage/Kconfig	2005-09-26 00:35:14.000000000 -0700
@@ -123,3 +123,17 @@ config USB_STORAGE_ONETOUCH
 	  hard drive's as an input device. An action can be associated with
 	  this input in any keybinding software. (e.g. gnome's keyboard short-
 	  cuts)
+
+config USB_LIBUSUAL
+	bool "The shared table of common (or usual) storage devices"
+	depends on USB
+	help
+	  This module contains a table of common (or usual) devices
+	  for usb-storage and ub drivers, and allows to switch binding
+	  of these devices without rebuilding modules.
+
+	  Typical syntax of /etc/modprobe.conf is:
+
+		options libusual bias="ub"
+
+	  If unsure, say N.
diff -urpN -X dontdiff linux-2.6.14-rc2/drivers/usb/storage/libusual.c linux-2.6.14-rc2-wip/drivers/usb/storage/libusual.c
--- linux-2.6.14-rc2/drivers/usb/storage/libusual.c	1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.14-rc2-wip/drivers/usb/storage/libusual.c	2005-10-06 23:58:37.000000000 -0700
@@ -0,0 +1,257 @@
+/*
+ * libusual
+ *
+ * The libusual contains the table of devices common for ub and usb-storage.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb_usual.h>
+#include <linux/vmalloc.h>
+
+/*
+ */
+#define USU_MOD_FL_THREAD   1	/* Thread is running */
+#define USU_MOD_FL_PRESENT  2	/* The module is loaded */
+
+struct mod_status {
+	unsigned long fls;
+};
+
+static struct mod_status stat[3];
+static DEFINE_SPINLOCK(usu_lock);
+
+/*
+ */
+#define USB_US_DEFAULT_BIAS	USB_US_TYPE_STOR
+
+#define BIAS_NAME_SIZE  (sizeof("usb-storage"))
+static char bias[BIAS_NAME_SIZE];
+static const char *bias_names[3] = { "none", "usb-storage", "ub" };
+
+static DECLARE_MUTEX_LOCKED(usu_init_notify);
+static DECLARE_COMPLETION(usu_end_notify);
+static atomic_t total_threads = ATOMIC_INIT(0);
+
+static int usu_probe_thread(void *arg);
+static void bias_storage_ids(int to_bias);
+static int parse_bias(const char *bias_s);
+
+/*
+ * The UNUSUAL_DEV_FL is a version of UNUSUAL_DEV for "flags-only"
+ * devices which only need an entry in usb_device_id array.
+ * It keeps arguments for vendor and product names because
+ * they are valuable comments, even though they are not used by the code.
+ */
+
+#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)|(USB_US_TYPE_STOR<<24) }
+
+#define USUAL_DEV(useProto, useTrans, useType) \
+{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, useProto, useTrans), \
+  .driver_info = ((useType)<<24) }
+
+struct usb_device_id storage_usb_ids [] = {
+#	include "unusual_devs.h"
+	{ } /* Terminating entry */
+};
+
+#undef USUAL_DEV
+#undef UNUSUAL_DEV
+
+MODULE_DEVICE_TABLE(usb, storage_usb_ids);
+EXPORT_SYMBOL(storage_usb_ids);
+
+/*
+ * @present: boolean, module is present
+ */
+void usb_usual_set_present(int type, int present)
+{
+	struct mod_status *st;
+	unsigned long flags;
+
+	if (type <= 0 || type >= 3)
+		return;
+	st = &stat[type];
+	spin_lock_irqsave(&usu_lock, flags);
+	st->fls &= ~USU_MOD_FL_PRESENT;
+	st->fls |= present * USU_MOD_FL_PRESENT;
+	spin_unlock_irqrestore(&usu_lock, flags);
+}
+EXPORT_SYMBOL(usb_usual_set_present);
+
+/*
+ */
+static int usu_probe(struct usb_interface *intf,
+			 const struct usb_device_id *id)
+{
+	int type = USB_US_TYPE(id->driver_info);
+	int rc;
+	unsigned long flags;
+
+	if (type == 0)
+		return -ENXIO;
+
+	spin_lock_irqsave(&usu_lock, flags);
+	if ((stat[type].fls & (USU_MOD_FL_THREAD|USU_MOD_FL_PRESENT)) != 0) {
+		spin_unlock_irqrestore(&usu_lock, flags);
+		return -ENXIO;
+	}
+	stat[type].fls |= USU_MOD_FL_THREAD;
+	spin_unlock_irqrestore(&usu_lock, flags);
+
+	rc = kernel_thread(usu_probe_thread, (void*)type, CLONE_VM);
+	if (rc < 0) {
+		printk(KERN_WARNING "libusual: "
+		    "Unable to start the thread for %s: %d\n",
+		    bias_names[type], rc);
+		spin_lock_irqsave(&usu_lock, flags);
+		stat[type].fls &= ~USU_MOD_FL_THREAD;
+		spin_unlock_irqrestore(&usu_lock, flags);
+		return rc;	/* Not being -ENXIO causes a message printed */
+	}
+	atomic_inc(&total_threads);
+
+	return -ENXIO;
+}
+
+static void usu_disconnect(struct usb_interface *intf)
+{
+	;	/* We should not be here. */
+}
+
+static struct usb_driver usu_driver = {
+	.owner =	THIS_MODULE,
+	.name =		"libusual",
+	.probe =	usu_probe,
+	.disconnect =	usu_disconnect,
+	.id_table =	storage_usb_ids,
+};
+
+/*
+ * A whole new thread for a purpose of request_module seems quite stupid.
+ * The request_module forks once inside again. However, if we attempt
+ * to load a storage module from our own modprobe thread, that module
+ * references our symbols, which cannot be resolved until our module is
+ * initialized. I wish there was a way to wait for the end of initialization.
+ * The module notifier reports MODULE_STATE_COMING only.
+ * So, we wait until module->init ends as the next best thing.
+ */
+static int usu_probe_thread(void *arg)
+{
+	int type = (unsigned long) arg;
+	struct mod_status *st = &stat[type];
+	int rc;
+	unsigned long flags;
+
+	daemonize("libusual_%d", type);	/* "usb-storage" is kinda too long */
+
+	/* A completion does not work here because it's counted. */
+	down(&usu_init_notify);
+	up(&usu_init_notify);
+
+	rc = request_module(bias_names[type]);
+/* P3 */ printk("request_module(%s) ended with %d\n", bias_names[type], rc);
+
+	spin_lock_irqsave(&usu_lock, flags);
+	if (rc == 0 && (st->fls & USU_MOD_FL_PRESENT) == 0) {
+		/*
+		 * This should not happen, but let us keep tabs on it.
+		 */
+		printk(KERN_NOTICE "libusual: "
+		    "modprobe for %s succeeded, but module is not present\n",
+		    bias_names[type]);
+	}
+	st->fls &= ~USU_MOD_FL_THREAD;
+	spin_unlock_irqrestore(&usu_lock, flags);
+	complete_and_exit(&usu_end_notify, 0);
+}
+
+/*
+ */
+static void bias_storage_ids(int to_bias)
+{
+	struct usb_device_id *id;
+
+	for (id = storage_usb_ids;
+		id->idVendor || id->bDeviceClass || id->bInterfaceClass ||
+		id->driver_info;
+		    id++) {
+		if (USB_US_TYPE(id->driver_info) == 0) {
+			id->driver_info |= to_bias << 24;
+		}
+	}
+}
+
+/*
+ */
+static int __init usb_usual_init(void)
+{
+	int usb_usual_bias;
+	int rc;
+
+	bias[BIAS_NAME_SIZE-1] = 0;
+	usb_usual_bias = parse_bias(bias);
+	bias_storage_ids(usb_usual_bias);
+
+	if ((rc = usb_register(&usu_driver)) != 0) {
+		up(&usu_init_notify);
+		return rc;
+	}
+	up(&usu_init_notify);
+	return 0;
+}
+
+static void __exit usb_usual_exit(void)
+{
+	/*
+	 * We do not check for any drivers present, because
+	 * they keep us pinned with symbol references.
+	 */
+
+	usb_deregister(&usu_driver);
+
+	while (atomic_read(&total_threads) > 0) {
+		wait_for_completion(&usu_end_notify);
+		atomic_dec(&total_threads);
+	}
+}
+
+/*
+ * Validate and accept the bias parameter.
+ * Maybe make an sysfs method later. XXX
+ */
+static int parse_bias(const char *bias_s)
+{
+	int i;
+	int bias_n = 0;
+
+	if (bias_s[0] == 0 || bias_s[0] == ' ') {
+		bias_n = USB_US_DEFAULT_BIAS;
+	} else {
+		for (i = 1; i < 3; i++) {
+			if (strcmp(bias_s, bias_names[i]) == 0) {
+				bias_n = i;
+				break;
+			}
+		}
+		if (bias_n == 0) {
+			bias_n = USB_US_DEFAULT_BIAS;
+			printk(KERN_INFO
+			    "libusual: unknown bias \"%s\", using \"%s\"\n",
+			    bias_s, bias_names[bias_n]);
+		}
+	}
+	return bias_n;
+}
+
+module_init(usb_usual_init);
+module_exit(usb_usual_exit);
+
+module_param_string(bias, bias, BIAS_NAME_SIZE,  S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(bias, "Bias to usb-storage or ub");
+
+MODULE_LICENSE("GPL");
diff -urpN -X dontdiff linux-2.6.14-rc2/drivers/usb/storage/Makefile linux-2.6.14-rc2-wip/drivers/usb/storage/Makefile
--- linux-2.6.14-rc2/drivers/usb/storage/Makefile	2005-09-24 20:32:55.000000000 -0700
+++ linux-2.6.14-rc2-wip/drivers/usb/storage/Makefile	2005-09-27 19:32:42.000000000 -0700
@@ -22,3 +22,7 @@ usb-storage-obj-$(CONFIG_USB_STORAGE_ONE
 
 usb-storage-objs :=	scsiglue.o protocol.o transport.o usb.o \
 			initializers.o $(usb-storage-obj-y)
+
+ifneq ($(CONFIG_USB_LIBUSUAL),)
+	obj-$(CONFIG_USB)	+= libusual.o
+endif
diff -urpN -X dontdiff linux-2.6.14-rc2/drivers/usb/storage/protocol.h linux-2.6.14-rc2-wip/drivers/usb/storage/protocol.h
--- linux-2.6.14-rc2/drivers/usb/storage/protocol.h	2005-06-17 12:48:29.000000000 -0700
+++ linux-2.6.14-rc2-wip/drivers/usb/storage/protocol.h	2005-09-27 17:49:25.000000000 -0700
@@ -41,20 +41,6 @@
 #ifndef _PROTOCOL_H_
 #define _PROTOCOL_H_
 
-/* Sub Classes */
-
-#define US_SC_RBC	0x01		/* Typically, flash devices */
-#define US_SC_8020	0x02		/* CD-ROM */
-#define US_SC_QIC	0x03		/* QIC-157 Tapes */
-#define US_SC_UFI	0x04		/* Floppy */
-#define US_SC_8070	0x05		/* Removable media */
-#define US_SC_SCSI	0x06		/* Transparent */
-#define US_SC_ISD200    0x07		/* ISD200 ATA */
-#define US_SC_MIN	US_SC_RBC
-#define US_SC_MAX	US_SC_ISD200
-
-#define US_SC_DEVICE	0xff		/* Use device's value */
-
 /* Protocol handling routines */
 extern void usb_stor_ATAPI_command(struct scsi_cmnd*, struct us_data*);
 extern void usb_stor_qic157_command(struct scsi_cmnd*, struct us_data*);
diff -urpN -X dontdiff linux-2.6.14-rc2/drivers/usb/storage/transport.h linux-2.6.14-rc2-wip/drivers/usb/storage/transport.h
--- linux-2.6.14-rc2/drivers/usb/storage/transport.h	2005-09-13 01:06:21.000000000 -0700
+++ linux-2.6.14-rc2-wip/drivers/usb/storage/transport.h	2005-09-27 17:50:23.000000000 -0700
@@ -44,36 +44,6 @@
 #include <linux/config.h>
 #include <linux/blkdev.h>
 
-/* Protocols */
-
-#define US_PR_CBI	0x00		/* Control/Bulk/Interrupt */
-#define US_PR_CB	0x01		/* Control/Bulk w/o interrupt */
-#define US_PR_BULK	0x50		/* bulk only */
-#ifdef CONFIG_USB_STORAGE_USBAT
-#define US_PR_SCM_ATAPI	0x80		/* SCM-ATAPI bridge */
-#endif
-#ifdef CONFIG_USB_STORAGE_SDDR09
-#define US_PR_EUSB_SDDR09	0x81	/* SCM-SCSI bridge for SDDR-09 */
-#endif
-#ifdef CONFIG_USB_STORAGE_SDDR55
-#define US_PR_SDDR55	0x82		/* SDDR-55 (made up) */
-#endif
-#define US_PR_DPCM_USB  0xf0		/* Combination CB/SDDR09 */
-
-#ifdef CONFIG_USB_STORAGE_FREECOM
-#define US_PR_FREECOM   0xf1		/* Freecom */
-#endif
-
-#ifdef CONFIG_USB_STORAGE_DATAFAB
-#define US_PR_DATAFAB   0xf2		/* Datafab chipsets */
-#endif
-
-#ifdef CONFIG_USB_STORAGE_JUMPSHOT
-#define US_PR_JUMPSHOT  0xf3		/* Lexar Jumpshot */
-#endif
-
-#define US_PR_DEVICE	0xff		/* Use device's value */
-
 /*
  * Bulk only data structures
  */
diff -urpN -X dontdiff linux-2.6.14-rc2/drivers/usb/storage/unusual_devs.h linux-2.6.14-rc2-wip/drivers/usb/storage/unusual_devs.h
--- linux-2.6.14-rc2/drivers/usb/storage/unusual_devs.h	2005-09-24 20:32:56.000000000 -0700
+++ linux-2.6.14-rc2-wip/drivers/usb/storage/unusual_devs.h	2005-10-06 21:44:56.000000000 -0700
@@ -1093,3 +1093,27 @@ UNUSUAL_DEV(  0x55aa, 0xa103, 0x0000, 0x
 		US_SC_SCSI, US_PR_SDDR55, NULL,
 		US_FL_SINGLE_LUN),
 #endif
+
+/* Control/Bulk transport for all SubClass values */
+USUAL_DEV(US_SC_RBC, US_PR_CB, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_8020, US_PR_CB, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_QIC, US_PR_CB, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_UFI, US_PR_CB, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_8070, US_PR_CB, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_SCSI, US_PR_CB, USB_US_TYPE_STOR),
+
+/* Control/Bulk/Interrupt transport for all SubClass values */
+USUAL_DEV(US_SC_RBC, US_PR_CBI, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_8020, US_PR_CBI, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_QIC, US_PR_CBI, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_UFI, US_PR_CBI, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_8070, US_PR_CBI, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_SCSI, US_PR_CBI, USB_US_TYPE_STOR),
+
+/* Bulk-only transport for all SubClass values */
+USUAL_DEV(US_SC_RBC, US_PR_BULK, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_8020, US_PR_BULK, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_QIC, US_PR_BULK, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_UFI, US_PR_BULK, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_8070, US_PR_BULK, USB_US_TYPE_STOR),
+USUAL_DEV(US_SC_SCSI, US_PR_BULK, 0),
diff -urpN -X dontdiff linux-2.6.14-rc2/drivers/usb/storage/usb.c linux-2.6.14-rc2-wip/drivers/usb/storage/usb.c
--- linux-2.6.14-rc2/drivers/usb/storage/usb.c	2005-09-24 20:32:56.000000000 -0700
+++ linux-2.6.14-rc2-wip/drivers/usb/storage/usb.c	2005-10-06 22:08:11.000000000 -0700
@@ -116,49 +116,33 @@ static int storage_probe(struct usb_inte
 
 static void storage_disconnect(struct usb_interface *iface);
 
-/* The entries in this table, except for final ones here
- * (USB_MASS_STORAGE_CLASS and the empty entry), correspond,
- * line for line with the entries of us_unsuaul_dev_list[].
+/*
+ * The entries in this table correspond, line for line,
+ * with the entries of us_unusual_dev_list[].
  */
+#ifndef CONFIG_USB_LIBUSUAL
 
 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 		    vendorName, productName,useProtocol, useTransport, \
 		    initFunction, flags) \
-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin,bcdDeviceMax) }
+{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin,bcdDeviceMax), \
+  .driver_info = (flags)|(USB_US_TYPE_STOR<<24) }
+
+#define USUAL_DEV(useProto, useTrans, useType) \
+{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, useProto, useTrans), \
+  .driver_info = (USB_US_TYPE_STOR<<24) }
 
 static struct usb_device_id storage_usb_ids [] = {
 
 #	include "unusual_devs.h"
 #undef UNUSUAL_DEV
-	/* Control/Bulk transport for all SubClass values */
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_CB) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_CB) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_CB) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_CB) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_CB) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_CB) },
-
-	/* Control/Bulk/Interrupt transport for all SubClass values */
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_CBI) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_CBI) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_CBI) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_CBI) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_CBI) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_CBI) },
-
-	/* Bulk-only transport for all SubClass values */
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_BULK) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_BULK) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_BULK) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_BULK) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_BULK) },
-	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) },
-
+#undef USUAL_DEV
 	/* Terminating entry */
 	{ }
 };
 
 MODULE_DEVICE_TABLE (usb, storage_usb_ids);
+#endif /* CONFIG_USB_LIBUSUAL */
 
 /* This is the list of devices we recognize, along with their flag data */
 
@@ -171,7 +155,6 @@ MODULE_DEVICE_TABLE (usb, storage_usb_id
  * are free to use as many characters as you like.
  */
 
-#undef UNUSUAL_DEV
 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
 		    vendor_name, product_name, use_protocol, use_transport, \
 		    init_function, Flags) \
@@ -181,53 +164,18 @@ MODULE_DEVICE_TABLE (usb, storage_usb_id
 	.useProtocol = use_protocol,	\
 	.useTransport = use_transport,	\
 	.initFunction = init_function,	\
-	.flags = Flags, \
+}
+
+#define USUAL_DEV(use_protocol, use_transport, use_type) \
+{ \
+	.useProtocol = use_protocol,	\
+	.useTransport = use_transport,	\
 }
 
 static struct us_unusual_dev us_unusual_dev_list[] = {
 #	include "unusual_devs.h" 
 #	undef UNUSUAL_DEV
-	/* Control/Bulk transport for all SubClass values */
-	{ .useProtocol = US_SC_RBC,
-	  .useTransport = US_PR_CB},
-	{ .useProtocol = US_SC_8020,
-	  .useTransport = US_PR_CB},
-	{ .useProtocol = US_SC_QIC,
-	  .useTransport = US_PR_CB},
-	{ .useProtocol = US_SC_UFI,
-	  .useTransport = US_PR_CB},
-	{ .useProtocol = US_SC_8070,
-	  .useTransport = US_PR_CB},
-	{ .useProtocol = US_SC_SCSI,
-	  .useTransport = US_PR_CB},
-
-	/* Control/Bulk/Interrupt transport for all SubClass values */
-	{ .useProtocol = US_SC_RBC,
-	  .useTransport = US_PR_CBI},
-	{ .useProtocol = US_SC_8020,
-	  .useTransport = US_PR_CBI},
-	{ .useProtocol = US_SC_QIC,
-	  .useTransport = US_PR_CBI},
-	{ .useProtocol = US_SC_UFI,
-	  .useTransport = US_PR_CBI},
-	{ .useProtocol = US_SC_8070,
-	  .useTransport = US_PR_CBI},
-	{ .useProtocol = US_SC_SCSI,
-	  .useTransport = US_PR_CBI},
-
-	/* Bulk-only transport for all SubClass values */
-	{ .useProtocol = US_SC_RBC,
-	  .useTransport = US_PR_BULK},
-	{ .useProtocol = US_SC_8020,
-	  .useTransport = US_PR_BULK},
-	{ .useProtocol = US_SC_QIC,
-	  .useTransport = US_PR_BULK},
-	{ .useProtocol = US_SC_UFI,
-	  .useTransport = US_PR_BULK},
-	{ .useProtocol = US_SC_8070,
-	  .useTransport = US_PR_BULK},
-	{ .useProtocol = US_SC_SCSI,
-	  .useTransport = US_PR_BULK},
+#	undef USUAL_DEV
 
 	/* Terminating entry */
 	{ NULL }
@@ -469,15 +417,21 @@ static int associate_dev(struct us_data 
 	}
 	return 0;
 }
+ 
+/* Find an unusual_dev descriptor (always succeeds in the current code) */
+static struct us_unusual_dev *find_unusual_entry(const struct usb_device_id *id)
+{
+	const int id_index = id - storage_usb_ids;
+	return &us_unusual_dev_list[id_index];
+}
 
 /* Get the unusual_devs entries and the string descriptors */
-static void get_device_info(struct us_data *us, int id_index)
+static void get_device_info(struct us_data *us, const struct usb_device_id *id)
 {
 	struct usb_device *dev = us->pusb_dev;
 	struct usb_interface_descriptor *idesc =
 		&us->pusb_intf->cur_altsetting->desc;
-	struct us_unusual_dev *unusual_dev = &us_unusual_dev_list[id_index];
-	struct usb_device_id *id = &storage_usb_ids[id_index];
+	struct us_unusual_dev *unusual_dev = find_unusual_entry(id);
 
 	/* Store the entries */
 	us->unusual_dev = unusual_dev;
@@ -487,7 +441,7 @@ static void get_device_info(struct us_da
 	us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ?
 			idesc->bInterfaceProtocol :
 			unusual_dev->useTransport;
-	us->flags = unusual_dev->flags;
+	us->flags = id->driver_info;
 
 	/*
 	 * This flag is only needed when we're in high-speed, so let's
@@ -515,7 +469,7 @@ static void get_device_info(struct us_da
 		if (unusual_dev->useTransport != US_PR_DEVICE &&
 			us->protocol == idesc->bInterfaceProtocol)
 			msg += 2;
-		if (msg >= 0 && !(unusual_dev->flags & US_FL_NEED_OVERRIDE))
+		if (msg >= 0 && !(us->flags & US_FL_NEED_OVERRIDE))
 			printk(KERN_NOTICE USB_STORAGE "This device "
 				"(%04x,%04x,%04x S %02x P %02x)"
 				" has %s in unusual_devs.h\n"
@@ -921,9 +875,11 @@ static int storage_probe(struct usb_inte
 {
 	struct Scsi_Host *host;
 	struct us_data *us;
-	const int id_index = id - storage_usb_ids; 
 	int result;
 
+	if (USB_US_TYPE(id->driver_info) != USB_US_TYPE_STOR)
+		return -ENXIO;
+
 	US_DEBUGP("USB Mass Storage device detected\n");
 
 	/*
@@ -956,7 +912,7 @@ static int storage_probe(struct usb_inte
 	 * of the match from the usb_device_id table, so we can find the
 	 * corresponding entry in the private table.
 	 */
-	get_device_info(us, id_index);
+	get_device_info(us, id);
 
 #ifdef CONFIG_USB_STORAGE_SDDR09
 	if (us->protocol == US_PR_EUSB_SDDR09 ||
@@ -1043,10 +999,14 @@ static int __init usb_stor_init(void)
 	int retval;
 	printk(KERN_INFO "Initializing USB Mass Storage driver...\n");
 
+	usb_usual_set_present(USB_US_TYPE_STOR, 1);
+
 	/* register the driver, return usb_register return code if error */
 	retval = usb_register(&usb_storage_driver);
 	if (retval == 0)
 		printk(KERN_INFO "USB Mass Storage support registered.\n");
+	else
+		usb_usual_set_present(USB_US_TYPE_STOR, 0);
 
 	return retval;
 }
@@ -1071,6 +1031,8 @@ static void __exit usb_stor_exit(void)
 		wait_for_completion(&threads_gone);
 		atomic_dec(&total_threads);
 	}
+
+	usb_usual_set_present(USB_US_TYPE_STOR, 0);
 }
 
 module_init(usb_stor_init);
diff -urpN -X dontdiff linux-2.6.14-rc2/drivers/usb/storage/usb.h linux-2.6.14-rc2-wip/drivers/usb/storage/usb.h
--- linux-2.6.14-rc2/drivers/usb/storage/usb.h	2005-09-24 20:32:56.000000000 -0700
+++ linux-2.6.14-rc2-wip/drivers/usb/storage/usb.h	2005-10-06 21:37:10.000000000 -0700
@@ -45,6 +45,7 @@
 #define _USB_H_
 
 #include <linux/usb.h>
+#include <linux/usb_usual.h>
 #include <linux/blkdev.h>
 #include <linux/smp_lock.h>
 #include <linux/completion.h>
@@ -63,50 +64,8 @@ struct us_unusual_dev {
 	__u8  useProtocol;
 	__u8  useTransport;
 	int (*initFunction)(struct us_data *);
-	unsigned int flags;
 };
 
-/*
- * Static flag definitions.  We use this roundabout technique so that the
- * proc_info() routine can automatically display a message for each flag.
- */
-#define US_DO_ALL_FLAGS						\
-	US_FLAG(SINGLE_LUN,	0x00000001)			\
-		/* allow access to only LUN 0 */		\
-	US_FLAG(NEED_OVERRIDE,	0x00000002)			\
-		/* unusual_devs entry is necessary */		\
-	US_FLAG(SCM_MULT_TARG,	0x00000004)			\
-		/* supports multiple targets */			\
-	US_FLAG(FIX_INQUIRY,	0x00000008)			\
-		/* INQUIRY response needs faking */		\
-	US_FLAG(FIX_CAPACITY,	0x00000010)			\
-		/* READ CAPACITY response too big */		\
-	US_FLAG(IGNORE_RESIDUE,	0x00000020)			\
-		/* reported residue is wrong */			\
-	US_FLAG(BULK32,		0x00000040)			\
-		/* Uses 32-byte CBW length */			\
-	US_FLAG(NOT_LOCKABLE,	0x00000080)			\
-		/* PREVENT/ALLOW not supported */		\
-	US_FLAG(GO_SLOW,	0x00000100)			\
-		/* Need delay after Command phase */		\
-	US_FLAG(NO_WP_DETECT,	0x00000200)			\
-		/* Don't check for write-protect */		\
-
-#define US_FLAG(name, value)	US_FL_##name = value ,
-enum { US_DO_ALL_FLAGS };
-#undef US_FLAG
-
-/* Dynamic flag definitions: used in set_bit() etc. */
-#define US_FLIDX_URB_ACTIVE	18  /* 0x00040000  current_urb is in use  */
-#define US_FLIDX_SG_ACTIVE	19  /* 0x00080000  current_sg is in use   */
-#define US_FLIDX_ABORTING	20  /* 0x00100000  abort is in progress   */
-#define US_FLIDX_DISCONNECTING	21  /* 0x00200000  disconnect in progress */
-#define ABORTING_OR_DISCONNECTING	((1UL << US_FLIDX_ABORTING) | \
-					 (1UL << US_FLIDX_DISCONNECTING))
-#define US_FLIDX_RESETTING	22  /* 0x00400000  device reset in progress */
-#define US_FLIDX_TIMED_OUT	23  /* 0x00800000  SCSI midlayer timed out  */
-
-
 #define USB_STOR_STRING_LEN 32
 
 /*
diff -urpN -X dontdiff linux-2.6.14-rc2/include/linux/usb_usual.h linux-2.6.14-rc2-wip/include/linux/usb_usual.h
--- linux-2.6.14-rc2/include/linux/usb_usual.h	1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.14-rc2-wip/include/linux/usb_usual.h	2005-09-27 18:05:09.000000000 -0700
@@ -0,0 +1,134 @@
+/*
+ * Interface to the libusual.
+ *
+ * Copyright (c) 2005 Pete Zaitcev <[email protected]>
+ * Copyright (c) 1999-2002 Matthew Dharm ([email protected])
+ * Copyright (c) 1999 Michael Gee ([email protected])
+ */
+
+#ifndef __LINUX_USB_USUAL_H
+#define __LINUX_USB_USUAL_H
+
+#include <linux/config.h>
+
+/* We should do this for cleanliness... But other usb_foo.h do not do this. */
+/* #include <linux/usb.h> */
+
+/*
+ * The flags field, which we store in usb_device_id.driver_info.
+ * It is compatible with the old usb-storage flags in lower 24 bits.
+ */
+
+/*
+ * Static flag definitions.  We use this roundabout technique so that the
+ * proc_info() routine can automatically display a message for each flag.
+ */
+#define US_DO_ALL_FLAGS						\
+	US_FLAG(SINGLE_LUN,	0x00000001)			\
+		/* allow access to only LUN 0 */		\
+	US_FLAG(NEED_OVERRIDE,	0x00000002)			\
+		/* unusual_devs entry is necessary */		\
+	US_FLAG(SCM_MULT_TARG,	0x00000004)			\
+		/* supports multiple targets */			\
+	US_FLAG(FIX_INQUIRY,	0x00000008)			\
+		/* INQUIRY response needs faking */		\
+	US_FLAG(FIX_CAPACITY,	0x00000010)			\
+		/* READ CAPACITY response too big */		\
+	US_FLAG(IGNORE_RESIDUE,	0x00000020)			\
+		/* reported residue is wrong */			\
+	US_FLAG(BULK32,		0x00000040)			\
+		/* Uses 32-byte CBW length */			\
+	US_FLAG(NOT_LOCKABLE,	0x00000080)			\
+		/* PREVENT/ALLOW not supported */		\
+	US_FLAG(GO_SLOW,	0x00000100)			\
+		/* Need delay after Command phase */		\
+	US_FLAG(NO_WP_DETECT,	0x00000200)			\
+		/* Don't check for write-protect */		\
+
+#define US_FLAG(name, value)	US_FL_##name = value ,
+enum { US_DO_ALL_FLAGS };
+#undef US_FLAG
+
+/* Dynamic flag definitions: used in set_bit() etc. */
+#define US_FLIDX_URB_ACTIVE	18  /* 0x00040000  current_urb is in use  */
+#define US_FLIDX_SG_ACTIVE	19  /* 0x00080000  current_sg is in use   */
+#define US_FLIDX_ABORTING	20  /* 0x00100000  abort is in progress   */
+#define US_FLIDX_DISCONNECTING	21  /* 0x00200000  disconnect in progress */
+#define ABORTING_OR_DISCONNECTING	((1UL << US_FLIDX_ABORTING) | \
+					 (1UL << US_FLIDX_DISCONNECTING))
+#define US_FLIDX_RESETTING	22  /* 0x00400000  device reset in progress */
+#define US_FLIDX_TIMED_OUT	23  /* 0x00800000  SCSI midlayer timed out  */
+
+/*
+ * The bias field for libusual and friends.
+ * Observe that usb-storage blatantly mixes set_bit() and normal
+ * shift and mask operations on flags, which is strictly illegal.
+ * And it probably even works for all flags except GO_SLOW and NO_WP_DETECT.
+ * We align with the shift and mask version used by static flags above, because
+ * we do not know (in theory) about the set_bit used by usb-storage internally.
+ * In next release, it might as well remap, use spinlocks, or whatever...
+ */
+#define USB_US_TYPE_NONE   0
+#define USB_US_TYPE_STOR   1
+#define USB_US_TYPE_UB     2
+
+#define USB_US_TYPE(flags)  (((flags) >> 24) & 0xFF)
+
+/*
+ * This is probably not the best place to keep these constants, conceptually.
+ * But it's the only header included into all places which need them.
+ */
+
+/* Sub Classes */
+
+#define US_SC_RBC	0x01		/* Typically, flash devices */
+#define US_SC_8020	0x02		/* CD-ROM */
+#define US_SC_QIC	0x03		/* QIC-157 Tapes */
+#define US_SC_UFI	0x04		/* Floppy */
+#define US_SC_8070	0x05		/* Removable media */
+#define US_SC_SCSI	0x06		/* Transparent */
+#define US_SC_ISD200    0x07		/* ISD200 ATA */
+#define US_SC_MIN	US_SC_RBC
+#define US_SC_MAX	US_SC_ISD200
+
+#define US_SC_DEVICE	0xff		/* Use device's value */
+
+/* Protocols */
+
+#define US_PR_CBI	0x00		/* Control/Bulk/Interrupt */
+#define US_PR_CB	0x01		/* Control/Bulk w/o interrupt */
+#define US_PR_BULK	0x50		/* bulk only */
+#ifdef CONFIG_USB_STORAGE_USBAT
+#define US_PR_SCM_ATAPI	0x80		/* SCM-ATAPI bridge */
+#endif
+#ifdef CONFIG_USB_STORAGE_SDDR09
+#define US_PR_EUSB_SDDR09	0x81	/* SCM-SCSI bridge for SDDR-09 */
+#endif
+#ifdef CONFIG_USB_STORAGE_SDDR55
+#define US_PR_SDDR55	0x82		/* SDDR-55 (made up) */
+#endif
+#define US_PR_DPCM_USB  0xf0		/* Combination CB/SDDR09 */
+#ifdef CONFIG_USB_STORAGE_FREECOM
+#define US_PR_FREECOM   0xf1		/* Freecom */
+#endif
+#ifdef CONFIG_USB_STORAGE_DATAFAB
+#define US_PR_DATAFAB   0xf2		/* Datafab chipsets */
+#endif
+#ifdef CONFIG_USB_STORAGE_JUMPSHOT
+#define US_PR_JUMPSHOT  0xf3		/* Lexar Jumpshot */
+#endif
+
+#define US_PR_DEVICE	0xff		/* Use device's value */
+
+/*
+ */
+#ifdef CONFIG_USB_LIBUSUAL
+
+extern struct usb_device_id storage_usb_ids[];
+extern void usb_usual_set_present(int type, int present);
+#else
+
+#define usb_usual_set_present(t,p)	do { } while(0)
+#endif /* CONFIG_USB_LIBUSUAL */
+
+#endif /* __LINUX_USB_USUAL_H */
-
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