1 files changed, 472 insertions, 0 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
new file mode 100644
index 000000000000..076462c8ba2a
--- /dev/null
+++ b/drivers/usb/core/driver.c
@@ -0,0 +1,472 @@
+/*
+ * drivers/usb/driver.c - most of the driver model stuff for usb
+ *
+ * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
+ *
+ * based on drivers/usb/usb.c which had the following copyrights:
+ *	(C) Copyright Linus Torvalds 1999
+ *	(C) Copyright Johannes Erdfelt 1999-2001
+ *	(C) Copyright Andreas Gal 1999
+ *	(C) Copyright Gregory P. Smith 1999
+ *	(C) Copyright Deti Fliegl 1999 (new USB architecture)
+ *	(C) Copyright Randy Dunlap 2000
+ *	(C) Copyright David Brownell 2000-2004
+ *	(C) Copyright Yggdrasil Computing, Inc. 2000
+ *		(usb_device_id matching changes by Adam J. Richter)
+ *	(C) Copyright Greg Kroah-Hartman 2002-2003
+ *
+ * NOTE! This is not actually a driver at all, rather this is
+ * just a collection of helper routines that implement the
+ * generic USB things that the real drivers can use..
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/device.h>
+#include <linux/usb.h>
+#include "hcd.h"
+#include "usb.h"
+
+static int usb_match_one_id(struct usb_interface *interface,
+			    const struct usb_device_id *id);
+
+struct usb_dynid {
+	struct list_head node;
+	struct usb_device_id id;
+};
+
+
+static int generic_probe(struct device *dev)
+{
+	return 0;
+}
+static int generic_remove(struct device *dev)
+{
+	struct usb_device *udev = to_usb_device(dev);
+
+	/* if this is only an unbind, not a physical disconnect, then
+	 * unconfigure the device */
+	if (udev->state == USB_STATE_CONFIGURED)
+		usb_set_configuration(udev, 0);
+
+	/* in case the call failed or the device was suspended */
+	if (udev->state >= USB_STATE_CONFIGURED)
+		usb_disable_device(udev, 0);
+	return 0;
+}
+
+struct device_driver usb_generic_driver = {
+	.owner = THIS_MODULE,
+	.name =	"usb",
+	.bus = &usb_bus_type,
+	.probe = generic_probe,
+	.remove = generic_remove,
+};
+
+/* Fun hack to determine if the struct device is a
+ * usb device or a usb interface. */
+int usb_generic_driver_data;
+
+#ifdef CONFIG_HOTPLUG
+
+/*
+ * Adds a new dynamic USBdevice ID to this driver,
+ * and cause the driver to probe for all devices again.
+ */
+static ssize_t store_new_id(struct device_driver *driver,
+			    const char *buf, size_t count)
+{
+	struct usb_driver *usb_drv = to_usb_driver(driver);
+	struct usb_dynid *dynid;
+	u32 idVendor = 0;
+	u32 idProduct = 0;
+	int fields = 0;
+
+	fields = sscanf(buf, "%x %x", &idVendor, &idProduct);
+	if (fields < 2)
+		return -EINVAL;
+
+	dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
+	if (!dynid)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&dynid->node);
+	dynid->id.idVendor = idVendor;
+	dynid->id.idProduct = idProduct;
+	dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
+
+	spin_lock(&usb_drv->dynids.lock);
+	list_add_tail(&usb_drv->dynids.list, &dynid->node);
+	spin_unlock(&usb_drv->dynids.lock);
+
+	if (get_driver(driver)) {
+		driver_attach(driver);
+		put_driver(driver);
+	}
+
+	return count;
+}
+static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
+
+static int usb_create_newid_file(struct usb_driver *usb_drv)
+{
+	int error = 0;
+
+	if (usb_drv->no_dynamic_id)
+		goto exit;
+
+	if (usb_drv->probe != NULL)
+		error = sysfs_create_file(&usb_drv->driver.kobj,
+					  &driver_attr_new_id.attr);
+exit:
+	return error;
+}
+
+static void usb_remove_newid_file(struct usb_driver *usb_drv)
+{
+	if (usb_drv->no_dynamic_id)
+		return;
+
+	if (usb_drv->probe != NULL)
+		sysfs_remove_file(&usb_drv->driver.kobj,
+				  &driver_attr_new_id.attr);
+}
+
+static void usb_free_dynids(struct usb_driver *usb_drv)
+{
+	struct usb_dynid *dynid, *n;
+
+	spin_lock(&usb_drv->dynids.lock);
+	list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) {
+		list_del(&dynid->node);
+		kfree(dynid);
+	}
+	spin_unlock(&usb_drv->dynids.lock);
+}
+#else
+static inline int usb_create_newid_file(struct usb_driver *usb_drv)
+{
+	return 0;
+}
+
+static void usb_remove_newid_file(struct usb_driver *usb_drv)
+{
+}
+
+static inline void usb_free_dynids(struct usb_driver *usb_drv)
+{
+}
+#endif
+
+static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf,
+							struct usb_driver *drv)
+{
+	struct usb_dynid *dynid;
+
+	spin_lock(&drv->dynids.lock);
+	list_for_each_entry(dynid, &drv->dynids.list, node) {
+		if (usb_match_one_id(intf, &dynid->id)) {
+			spin_unlock(&drv->dynids.lock);
+			return &dynid->id;
+		}
+	}
+	spin_unlock(&drv->dynids.lock);
+	return NULL;
+}
+
+
+/* called from driver core with usb_bus_type.subsys writelock */
+static int usb_probe_interface(struct device *dev)
+{
+	struct usb_interface * intf = to_usb_interface(dev);
+	struct usb_driver * driver = to_usb_driver(dev->driver);
+	const struct usb_device_id *id;
+	int error = -ENODEV;
+
+	dev_dbg(dev, "%s\n", __FUNCTION__);
+
+	if (!driver->probe)
+		return error;
+	/* FIXME we'd much prefer to just resume it ... */
+	if (interface_to_usbdev(intf)->state == USB_STATE_SUSPENDED)
+		return -EHOSTUNREACH;
+
+	id = usb_match_id(intf, driver->id_table);
+	if (!id)
+		id = usb_match_dynamic_id(intf, driver);
+	if (id) {
+		dev_dbg(dev, "%s - got id\n", __FUNCTION__);
+
+		/* Interface "power state" doesn't correspond to any hardware
+		 * state whatsoever.  We use it to record when it's bound to
+		 * a driver that may start I/0:  it's not frozen/quiesced.
+		 */
+		mark_active(intf);
+		intf->condition = USB_INTERFACE_BINDING;
+		error = driver->probe(intf, id);
+		if (error) {
+			mark_quiesced(intf);
+			intf->condition = USB_INTERFACE_UNBOUND;
+		} else
+			intf->condition = USB_INTERFACE_BOUND;
+	}
+
+	return error;
+}
+
+/* called from driver core with usb_bus_type.subsys writelock */
+static int usb_unbind_interface(struct device *dev)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct usb_driver *driver = to_usb_driver(intf->dev.driver);
+
+	intf->condition = USB_INTERFACE_UNBINDING;
+
+	/* release all urbs for this interface */
+	usb_disable_interface(interface_to_usbdev(intf), intf);
+
+	if (driver && driver->disconnect)
+		driver->disconnect(intf);
+
+	/* reset other interface state */
+	usb_set_interface(interface_to_usbdev(intf),
+			intf->altsetting[0].desc.bInterfaceNumber,
+			0);
+	usb_set_intfdata(intf, NULL);
+	intf->condition = USB_INTERFACE_UNBOUND;
+	mark_quiesced(intf);
+
+	return 0;
+}
+
+/* returns 0 if no match, 1 if match */
+static int usb_match_one_id(struct usb_interface *interface,
+			    const struct usb_device_id *id)
+{
+	struct usb_host_interface *intf;
+	struct usb_device *dev;
+
+	/* proc_connectinfo in devio.c may call us with id == NULL. */
+	if (id == NULL)
+		return 0;
+
+	intf = interface->cur_altsetting;
+	dev = interface_to_usbdev(interface);
+
+	if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
+	    id->idVendor != le16_to_cpu(dev->descriptor.idVendor))
+		return 0;
+
+	if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
+	    id->idProduct != le16_to_cpu(dev->descriptor.idProduct))
+		return 0;
+
+	/* No need to test id->bcdDevice_lo != 0, since 0 is never
+	   greater than any unsigned number. */
+	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
+	    (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice)))
+		return 0;
+
+	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
+	    (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice)))
+		return 0;
+
+	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
+	    (id->bDeviceClass != dev->descriptor.bDeviceClass))
+		return 0;
+
+	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
+	    (id->bDeviceSubClass!= dev->descriptor.bDeviceSubClass))
+		return 0;
+
+	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
+	    (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol))
+		return 0;
+
+	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
+	    (id->bInterfaceClass != intf->desc.bInterfaceClass))
+		return 0;
+
+	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
+	    (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass))
+		return 0;
+
+	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
+	    (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol))
+		return 0;
+
+	return 1;
+}
+/**
+ * usb_match_id - find first usb_device_id matching device or interface
+ * @interface: the interface of interest
+ * @id: array of usb_device_id structures, terminated by zero entry
+ *
+ * usb_match_id searches an array of usb_device_id's and returns
+ * the first one matching the device or interface, or null.
+ * This is used when binding (or rebinding) a driver to an interface.
+ * Most USB device drivers will use this indirectly, through the usb core,
+ * but some layered driver frameworks use it directly.
+ * These device tables are exported with MODULE_DEVICE_TABLE, through
+ * modutils, to support the driver loading functionality of USB hotplugging.
+ *
+ * What Matches:
+ *
+ * The "match_flags" element in a usb_device_id controls which
+ * members are used.  If the corresponding bit is set, the
+ * value in the device_id must match its corresponding member
+ * in the device or interface descriptor, or else the device_id
+ * does not match.
+ *
+ * "driver_info" is normally used only by device drivers,
+ * but you can create a wildcard "matches anything" usb_device_id
+ * as a driver's "modules.usbmap" entry if you provide an id with
+ * only a nonzero "driver_info" field.  If you do this, the USB device
+ * driver's probe() routine should use additional intelligence to
+ * decide whether to bind to the specified interface.
+ *
+ * What Makes Good usb_device_id Tables:
+ *
+ * The match algorithm is very simple, so that intelligence in
+ * driver selection must come from smart driver id records.
+ * Unless you have good reasons to use another selection policy,
+ * provide match elements only in related groups, and order match
+ * specifiers from specific to general.  Use the macros provided
+ * for that purpose if you can.
+ *
+ * The most specific match specifiers use device descriptor
+ * data.  These are commonly used with product-specific matches;
+ * the USB_DEVICE macro lets you provide vendor and product IDs,
+ * and you can also match against ranges of product revisions.
+ * These are widely used for devices with application or vendor
+ * specific bDeviceClass values.
+ *
+ * Matches based on device class/subclass/protocol specifications
+ * are slightly more general; use the USB_DEVICE_INFO macro, or
+ * its siblings.  These are used with single-function devices
+ * where bDeviceClass doesn't specify that each interface has
+ * its own class.
+ *
+ * Matches based on interface class/subclass/protocol are the
+ * most general; they let drivers bind to any interface on a
+ * multiple-function device.  Use the USB_INTERFACE_INFO
+ * macro, or its siblings, to match class-per-interface style
+ * devices (as recorded in bDeviceClass).
+ *
+ * Within those groups, remember that not all combinations are
+ * meaningful.  For example, don't give a product version range
+ * without vendor and product IDs; or specify a protocol without
+ * its associated class and subclass.
+ */
+const struct usb_device_id *usb_match_id(struct usb_interface *interface,
+					 const struct usb_device_id *id)
+{
+	/* proc_connectinfo in devio.c may call us with id == NULL. */
+	if (id == NULL)
+		return NULL;
+
+	/* It is important to check that id->driver_info is nonzero,
+	   since an entry that is all zeroes except for a nonzero
+	   id->driver_info is the way to create an entry that
+	   indicates that the driver want to examine every
+	   device and interface. */
+	for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass ||
+	       id->driver_info; id++) {
+		if (usb_match_one_id(interface, id))
+			return id;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(usb_match_id);
+
+int usb_device_match(struct device *dev, struct device_driver *drv)
+{
+	struct usb_interface *intf;
+	struct usb_driver *usb_drv;
+	const struct usb_device_id *id;
+
+	/* check for generic driver, which we don't match any device with */
+	if (drv == &usb_generic_driver)
+		return 0;
+
+	intf = to_usb_interface(dev);
+	usb_drv = to_usb_driver(drv);
+
+	id = usb_match_id(intf, usb_drv->id_table);
+	if (id)
+		return 1;
+
+	id = usb_match_dynamic_id(intf, usb_drv);
+	if (id)
+		return 1;
+	return 0;
+}
+
+/**
+ * usb_register_driver - register a USB driver
+ * @new_driver: USB operations for the driver
+ * @owner: module owner of this driver.
+ *
+ * Registers a USB driver with the USB core.  The list of unattached
+ * interfaces will be rescanned whenever a new driver is added, allowing
+ * the new driver to attach to any recognized devices.
+ * Returns a negative error code on failure and 0 on success.
+ *
+ * NOTE: if you want your driver to use the USB major number, you must call
+ * usb_register_dev() to enable that functionality.  This function no longer
+ * takes care of that.
+ */
+int usb_register_driver(struct usb_driver *new_driver, struct module *owner)
+{
+	int retval = 0;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	new_driver->driver.name = (char *)new_driver->name;
+	new_driver->driver.bus = &usb_bus_type;
+	new_driver->driver.probe = usb_probe_interface;
+	new_driver->driver.remove = usb_unbind_interface;
+	new_driver->driver.owner = owner;
+	spin_lock_init(&new_driver->dynids.lock);
+	INIT_LIST_HEAD(&new_driver->dynids.list);
+
+	retval = driver_register(&new_driver->driver);
+
+	if (!retval) {
+		pr_info("%s: registered new driver %s\n",
+			usbcore_name, new_driver->name);
+		usbfs_update_special();
+		usb_create_newid_file(new_driver);
+	} else {
+		printk(KERN_ERR "%s: error %d registering driver %s\n",
+			usbcore_name, retval, new_driver->name);
+	}
+
+	return retval;
+}
+EXPORT_SYMBOL_GPL(usb_register_driver);
+
+/**
+ * usb_deregister - unregister a USB driver
+ * @driver: USB operations of the driver to unregister
+ * Context: must be able to sleep
+ *
+ * Unlinks the specified driver from the internal USB driver list.
+ *
+ * NOTE: If you called usb_register_dev(), you still need to call
+ * usb_deregister_dev() to clean up your driver's allocated minor numbers,
+ * this * call will no longer do it for you.
+ */
+void usb_deregister(struct usb_driver *driver)
+{
+	pr_info("%s: deregistering driver %s\n", usbcore_name, driver->name);
+
+	usb_remove_newid_file(driver);
+	usb_free_dynids(driver);
+	driver_unregister(&driver->driver);
+
+	usbfs_update_special();
+}
+EXPORT_SYMBOL_GPL(usb_deregister);