Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1159 insertions, 0 deletions

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
new file mode 100644
index 000000000..3500e3c94
--- /dev/null
+++ b/drivers/usb/core/usb.c
@@ -0,0 +1,1159 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * drivers/usb/core/usb.c
+ *
+ * (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
+ *
+ * Released under the GPLv2 only.
+ *
+ * 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..
+ *
+ * Think of this as a "USB library" rather than anything else,
+ * with no callbacks.  Callbacks are evil.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/string.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/kmod.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+#include <linux/debugfs.h>
+#include <linux/usb/of.h>
+
+#include <asm/io.h>
+#include <linux/scatterlist.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+
+#include "hub.h"
+
+const char *usbcore_name = "usbcore";
+
+static bool nousb;	/* Disable USB when built into kernel image */
+
+module_param(nousb, bool, 0444);
+
+/*
+ * for external read access to <nousb>
+ */
+int usb_disabled(void)
+{
+	return nousb;
+}
+EXPORT_SYMBOL_GPL(usb_disabled);
+
+#ifdef	CONFIG_PM
+/* Default delay value, in seconds */
+static int usb_autosuspend_delay = CONFIG_USB_AUTOSUSPEND_DELAY;
+module_param_named(autosuspend, usb_autosuspend_delay, int, 0644);
+MODULE_PARM_DESC(autosuspend, "default autosuspend delay");
+
+#else
+#define usb_autosuspend_delay		0
+#endif
+
+static bool match_endpoint(struct usb_endpoint_descriptor *epd,
+		struct usb_endpoint_descriptor **bulk_in,
+		struct usb_endpoint_descriptor **bulk_out,
+		struct usb_endpoint_descriptor **int_in,
+		struct usb_endpoint_descriptor **int_out)
+{
+	switch (usb_endpoint_type(epd)) {
+	case USB_ENDPOINT_XFER_BULK:
+		if (usb_endpoint_dir_in(epd)) {
+			if (bulk_in && !*bulk_in) {
+				*bulk_in = epd;
+				break;
+			}
+		} else {
+			if (bulk_out && !*bulk_out) {
+				*bulk_out = epd;
+				break;
+			}
+		}
+
+		return false;
+	case USB_ENDPOINT_XFER_INT:
+		if (usb_endpoint_dir_in(epd)) {
+			if (int_in && !*int_in) {
+				*int_in = epd;
+				break;
+			}
+		} else {
+			if (int_out && !*int_out) {
+				*int_out = epd;
+				break;
+			}
+		}
+
+		return false;
+	default:
+		return false;
+	}
+
+	return (!bulk_in || *bulk_in) && (!bulk_out || *bulk_out) &&
+			(!int_in || *int_in) && (!int_out || *int_out);
+}
+
+/**
+ * usb_find_common_endpoints() -- look up common endpoint descriptors
+ * @alt:	alternate setting to search
+ * @bulk_in:	pointer to descriptor pointer, or NULL
+ * @bulk_out:	pointer to descriptor pointer, or NULL
+ * @int_in:	pointer to descriptor pointer, or NULL
+ * @int_out:	pointer to descriptor pointer, or NULL
+ *
+ * Search the alternate setting's endpoint descriptors for the first bulk-in,
+ * bulk-out, interrupt-in and interrupt-out endpoints and return them in the
+ * provided pointers (unless they are NULL).
+ *
+ * If a requested endpoint is not found, the corresponding pointer is set to
+ * NULL.
+ *
+ * Return: Zero if all requested descriptors were found, or -ENXIO otherwise.
+ */
+int usb_find_common_endpoints(struct usb_host_interface *alt,
+		struct usb_endpoint_descriptor **bulk_in,
+		struct usb_endpoint_descriptor **bulk_out,
+		struct usb_endpoint_descriptor **int_in,
+		struct usb_endpoint_descriptor **int_out)
+{
+	struct usb_endpoint_descriptor *epd;
+	int i;
+
+	if (bulk_in)
+		*bulk_in = NULL;
+	if (bulk_out)
+		*bulk_out = NULL;
+	if (int_in)
+		*int_in = NULL;
+	if (int_out)
+		*int_out = NULL;
+
+	for (i = 0; i < alt->desc.bNumEndpoints; ++i) {
+		epd = &alt->endpoint[i].desc;
+
+		if (match_endpoint(epd, bulk_in, bulk_out, int_in, int_out))
+			return 0;
+	}
+
+	return -ENXIO;
+}
+EXPORT_SYMBOL_GPL(usb_find_common_endpoints);
+
+/**
+ * usb_find_common_endpoints_reverse() -- look up common endpoint descriptors
+ * @alt:	alternate setting to search
+ * @bulk_in:	pointer to descriptor pointer, or NULL
+ * @bulk_out:	pointer to descriptor pointer, or NULL
+ * @int_in:	pointer to descriptor pointer, or NULL
+ * @int_out:	pointer to descriptor pointer, or NULL
+ *
+ * Search the alternate setting's endpoint descriptors for the last bulk-in,
+ * bulk-out, interrupt-in and interrupt-out endpoints and return them in the
+ * provided pointers (unless they are NULL).
+ *
+ * If a requested endpoint is not found, the corresponding pointer is set to
+ * NULL.
+ *
+ * Return: Zero if all requested descriptors were found, or -ENXIO otherwise.
+ */
+int usb_find_common_endpoints_reverse(struct usb_host_interface *alt,
+		struct usb_endpoint_descriptor **bulk_in,
+		struct usb_endpoint_descriptor **bulk_out,
+		struct usb_endpoint_descriptor **int_in,
+		struct usb_endpoint_descriptor **int_out)
+{
+	struct usb_endpoint_descriptor *epd;
+	int i;
+
+	if (bulk_in)
+		*bulk_in = NULL;
+	if (bulk_out)
+		*bulk_out = NULL;
+	if (int_in)
+		*int_in = NULL;
+	if (int_out)
+		*int_out = NULL;
+
+	for (i = alt->desc.bNumEndpoints - 1; i >= 0; --i) {
+		epd = &alt->endpoint[i].desc;
+
+		if (match_endpoint(epd, bulk_in, bulk_out, int_in, int_out))
+			return 0;
+	}
+
+	return -ENXIO;
+}
+EXPORT_SYMBOL_GPL(usb_find_common_endpoints_reverse);
+
+/**
+ * usb_find_endpoint() - Given an endpoint address, search for the endpoint's
+ * usb_host_endpoint structure in an interface's current altsetting.
+ * @intf: the interface whose current altsetting should be searched
+ * @ep_addr: the endpoint address (number and direction) to find
+ *
+ * Search the altsetting's list of endpoints for one with the specified address.
+ *
+ * Return: Pointer to the usb_host_endpoint if found, %NULL otherwise.
+ */
+static const struct usb_host_endpoint *usb_find_endpoint(
+		const struct usb_interface *intf, unsigned int ep_addr)
+{
+	int n;
+	const struct usb_host_endpoint *ep;
+
+	n = intf->cur_altsetting->desc.bNumEndpoints;
+	ep = intf->cur_altsetting->endpoint;
+	for (; n > 0; (--n, ++ep)) {
+		if (ep->desc.bEndpointAddress == ep_addr)
+			return ep;
+	}
+	return NULL;
+}
+
+/**
+ * usb_check_bulk_endpoints - Check whether an interface's current altsetting
+ * contains a set of bulk endpoints with the given addresses.
+ * @intf: the interface whose current altsetting should be searched
+ * @ep_addrs: 0-terminated array of the endpoint addresses (number and
+ * direction) to look for
+ *
+ * Search for endpoints with the specified addresses and check their types.
+ *
+ * Return: %true if all the endpoints are found and are bulk, %false otherwise.
+ */
+bool usb_check_bulk_endpoints(
+		const struct usb_interface *intf, const u8 *ep_addrs)
+{
+	const struct usb_host_endpoint *ep;
+
+	for (; *ep_addrs; ++ep_addrs) {
+		ep = usb_find_endpoint(intf, *ep_addrs);
+		if (!ep || !usb_endpoint_xfer_bulk(&ep->desc))
+			return false;
+	}
+	return true;
+}
+EXPORT_SYMBOL_GPL(usb_check_bulk_endpoints);
+
+/**
+ * usb_check_int_endpoints - Check whether an interface's current altsetting
+ * contains a set of interrupt endpoints with the given addresses.
+ * @intf: the interface whose current altsetting should be searched
+ * @ep_addrs: 0-terminated array of the endpoint addresses (number and
+ * direction) to look for
+ *
+ * Search for endpoints with the specified addresses and check their types.
+ *
+ * Return: %true if all the endpoints are found and are interrupt,
+ * %false otherwise.
+ */
+bool usb_check_int_endpoints(
+		const struct usb_interface *intf, const u8 *ep_addrs)
+{
+	const struct usb_host_endpoint *ep;
+
+	for (; *ep_addrs; ++ep_addrs) {
+		ep = usb_find_endpoint(intf, *ep_addrs);
+		if (!ep || !usb_endpoint_xfer_int(&ep->desc))
+			return false;
+	}
+	return true;
+}
+EXPORT_SYMBOL_GPL(usb_check_int_endpoints);
+
+/**
+ * usb_find_alt_setting() - Given a configuration, find the alternate setting
+ * for the given interface.
+ * @config: the configuration to search (not necessarily the current config).
+ * @iface_num: interface number to search in
+ * @alt_num: alternate interface setting number to search for.
+ *
+ * Search the configuration's interface cache for the given alt setting.
+ *
+ * Return: The alternate setting, if found. %NULL otherwise.
+ */
+struct usb_host_interface *usb_find_alt_setting(
+		struct usb_host_config *config,
+		unsigned int iface_num,
+		unsigned int alt_num)
+{
+	struct usb_interface_cache *intf_cache = NULL;
+	int i;
+
+	if (!config)
+		return NULL;
+	for (i = 0; i < config->desc.bNumInterfaces; i++) {
+		if (config->intf_cache[i]->altsetting[0].desc.bInterfaceNumber
+				== iface_num) {
+			intf_cache = config->intf_cache[i];
+			break;
+		}
+	}
+	if (!intf_cache)
+		return NULL;
+	for (i = 0; i < intf_cache->num_altsetting; i++)
+		if (intf_cache->altsetting[i].desc.bAlternateSetting == alt_num)
+			return &intf_cache->altsetting[i];
+
+	printk(KERN_DEBUG "Did not find alt setting %u for intf %u, "
+			"config %u\n", alt_num, iface_num,
+			config->desc.bConfigurationValue);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(usb_find_alt_setting);
+
+/**
+ * usb_ifnum_to_if - get the interface object with a given interface number
+ * @dev: the device whose current configuration is considered
+ * @ifnum: the desired interface
+ *
+ * This walks the device descriptor for the currently active configuration
+ * to find the interface object with the particular interface number.
+ *
+ * Note that configuration descriptors are not required to assign interface
+ * numbers sequentially, so that it would be incorrect to assume that
+ * the first interface in that descriptor corresponds to interface zero.
+ * This routine helps device drivers avoid such mistakes.
+ * However, you should make sure that you do the right thing with any
+ * alternate settings available for this interfaces.
+ *
+ * Don't call this function unless you are bound to one of the interfaces
+ * on this device or you have locked the device!
+ *
+ * Return: A pointer to the interface that has @ifnum as interface number,
+ * if found. %NULL otherwise.
+ */
+struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev,
+				      unsigned ifnum)
+{
+	struct usb_host_config *config = dev->actconfig;
+	int i;
+
+	if (!config)
+		return NULL;
+	for (i = 0; i < config->desc.bNumInterfaces; i++)
+		if (config->interface[i]->altsetting[0]
+				.desc.bInterfaceNumber == ifnum)
+			return config->interface[i];
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(usb_ifnum_to_if);
+
+/**
+ * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number.
+ * @intf: the interface containing the altsetting in question
+ * @altnum: the desired alternate setting number
+ *
+ * This searches the altsetting array of the specified interface for
+ * an entry with the correct bAlternateSetting value.
+ *
+ * Note that altsettings need not be stored sequentially by number, so
+ * it would be incorrect to assume that the first altsetting entry in
+ * the array corresponds to altsetting zero.  This routine helps device
+ * drivers avoid such mistakes.
+ *
+ * Don't call this function unless you are bound to the intf interface
+ * or you have locked the device!
+ *
+ * Return: A pointer to the entry of the altsetting array of @intf that
+ * has @altnum as the alternate setting number. %NULL if not found.
+ */
+struct usb_host_interface *usb_altnum_to_altsetting(
+					const struct usb_interface *intf,
+					unsigned int altnum)
+{
+	int i;
+
+	for (i = 0; i < intf->num_altsetting; i++) {
+		if (intf->altsetting[i].desc.bAlternateSetting == altnum)
+			return &intf->altsetting[i];
+	}
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting);
+
+struct find_interface_arg {
+	int minor;
+	struct device_driver *drv;
+};
+
+static int __find_interface(struct device *dev, const void *data)
+{
+	const struct find_interface_arg *arg = data;
+	struct usb_interface *intf;
+
+	if (!is_usb_interface(dev))
+		return 0;
+
+	if (dev->driver != arg->drv)
+		return 0;
+	intf = to_usb_interface(dev);
+	return intf->minor == arg->minor;
+}
+
+/**
+ * usb_find_interface - find usb_interface pointer for driver and device
+ * @drv: the driver whose current configuration is considered
+ * @minor: the minor number of the desired device
+ *
+ * This walks the bus device list and returns a pointer to the interface
+ * with the matching minor and driver.  Note, this only works for devices
+ * that share the USB major number.
+ *
+ * Return: A pointer to the interface with the matching major and @minor.
+ */
+struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor)
+{
+	struct find_interface_arg argb;
+	struct device *dev;
+
+	argb.minor = minor;
+	argb.drv = &drv->drvwrap.driver;
+
+	dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface);
+
+	/* Drop reference count from bus_find_device */
+	put_device(dev);
+
+	return dev ? to_usb_interface(dev) : NULL;
+}
+EXPORT_SYMBOL_GPL(usb_find_interface);
+
+struct each_dev_arg {
+	void *data;
+	int (*fn)(struct usb_device *, void *);
+};
+
+static int __each_dev(struct device *dev, void *data)
+{
+	struct each_dev_arg *arg = (struct each_dev_arg *)data;
+
+	/* There are struct usb_interface on the same bus, filter them out */
+	if (!is_usb_device(dev))
+		return 0;
+
+	return arg->fn(to_usb_device(dev), arg->data);
+}
+
+/**
+ * usb_for_each_dev - iterate over all USB devices in the system
+ * @data: data pointer that will be handed to the callback function
+ * @fn: callback function to be called for each USB device
+ *
+ * Iterate over all USB devices and call @fn for each, passing it @data. If it
+ * returns anything other than 0, we break the iteration prematurely and return
+ * that value.
+ */
+int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *))
+{
+	struct each_dev_arg arg = {data, fn};
+
+	return bus_for_each_dev(&usb_bus_type, NULL, &arg, __each_dev);
+}
+EXPORT_SYMBOL_GPL(usb_for_each_dev);
+
+/**
+ * usb_release_dev - free a usb device structure when all users of it are finished.
+ * @dev: device that's been disconnected
+ *
+ * Will be called only by the device core when all users of this usb device are
+ * done.
+ */
+static void usb_release_dev(struct device *dev)
+{
+	struct usb_device *udev;
+	struct usb_hcd *hcd;
+
+	udev = to_usb_device(dev);
+	hcd = bus_to_hcd(udev->bus);
+
+	usb_destroy_configuration(udev);
+	usb_release_bos_descriptor(udev);
+	of_node_put(dev->of_node);
+	usb_put_hcd(hcd);
+	kfree(udev->product);
+	kfree(udev->manufacturer);
+	kfree(udev->serial);
+	kfree(udev);
+}
+
+static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct usb_device *usb_dev;
+
+	usb_dev = to_usb_device(dev);
+
+	if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum))
+		return -ENOMEM;
+
+	if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum))
+		return -ENOMEM;
+
+	return 0;
+}
+
+#ifdef	CONFIG_PM
+
+/* USB device Power-Management thunks.
+ * There's no need to distinguish here between quiescing a USB device
+ * and powering it down; the generic_suspend() routine takes care of
+ * it by skipping the usb_port_suspend() call for a quiesce.  And for
+ * USB interfaces there's no difference at all.
+ */
+
+static int usb_dev_prepare(struct device *dev)
+{
+	return 0;		/* Implement eventually? */
+}
+
+static void usb_dev_complete(struct device *dev)
+{
+	/* Currently used only for rebinding interfaces */
+	usb_resume_complete(dev);
+}
+
+static int usb_dev_suspend(struct device *dev)
+{
+	return usb_suspend(dev, PMSG_SUSPEND);
+}
+
+static int usb_dev_resume(struct device *dev)
+{
+	return usb_resume(dev, PMSG_RESUME);
+}
+
+static int usb_dev_freeze(struct device *dev)
+{
+	return usb_suspend(dev, PMSG_FREEZE);
+}
+
+static int usb_dev_thaw(struct device *dev)
+{
+	return usb_resume(dev, PMSG_THAW);
+}
+
+static int usb_dev_poweroff(struct device *dev)
+{
+	return usb_suspend(dev, PMSG_HIBERNATE);
+}
+
+static int usb_dev_restore(struct device *dev)
+{
+	return usb_resume(dev, PMSG_RESTORE);
+}
+
+static const struct dev_pm_ops usb_device_pm_ops = {
+	.prepare =	usb_dev_prepare,
+	.complete =	usb_dev_complete,
+	.suspend =	usb_dev_suspend,
+	.resume =	usb_dev_resume,
+	.freeze =	usb_dev_freeze,
+	.thaw =		usb_dev_thaw,
+	.poweroff =	usb_dev_poweroff,
+	.restore =	usb_dev_restore,
+	.runtime_suspend =	usb_runtime_suspend,
+	.runtime_resume =	usb_runtime_resume,
+	.runtime_idle =		usb_runtime_idle,
+};
+
+#endif	/* CONFIG_PM */
+
+
+static char *usb_devnode(struct device *dev,
+			 umode_t *mode, kuid_t *uid, kgid_t *gid)
+{
+	struct usb_device *usb_dev;
+
+	usb_dev = to_usb_device(dev);
+	return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d",
+			 usb_dev->bus->busnum, usb_dev->devnum);
+}
+
+struct device_type usb_device_type = {
+	.name =		"usb_device",
+	.release =	usb_release_dev,
+	.uevent =	usb_dev_uevent,
+	.devnode = 	usb_devnode,
+#ifdef CONFIG_PM
+	.pm =		&usb_device_pm_ops,
+#endif
+};
+
+
+/* Returns 1 if @usb_bus is WUSB, 0 otherwise */
+static unsigned usb_bus_is_wusb(struct usb_bus *bus)
+{
+	struct usb_hcd *hcd = bus_to_hcd(bus);
+	return hcd->wireless;
+}
+
+static bool usb_dev_authorized(struct usb_device *dev, struct usb_hcd *hcd)
+{
+	struct usb_hub *hub;
+
+	if (!dev->parent)
+		return true; /* Root hub always ok [and always wired] */
+
+	switch (hcd->dev_policy) {
+	case USB_DEVICE_AUTHORIZE_NONE:
+	default:
+		return false;
+
+	case USB_DEVICE_AUTHORIZE_ALL:
+		return true;
+
+	case USB_DEVICE_AUTHORIZE_INTERNAL:
+		hub = usb_hub_to_struct_hub(dev->parent);
+		return hub->ports[dev->portnum - 1]->connect_type ==
+				USB_PORT_CONNECT_TYPE_HARD_WIRED;
+	}
+}
+
+/**
+ * usb_alloc_dev - usb device constructor (usbcore-internal)
+ * @parent: hub to which device is connected; null to allocate a root hub
+ * @bus: bus used to access the device
+ * @port1: one-based index of port; ignored for root hubs
+ *
+ * Context: task context, might sleep.
+ *
+ * Only hub drivers (including virtual root hub drivers for host
+ * controllers) should ever call this.
+ *
+ * This call may not be used in a non-sleeping context.
+ *
+ * Return: On success, a pointer to the allocated usb device. %NULL on
+ * failure.
+ */
+struct usb_device *usb_alloc_dev(struct usb_device *parent,
+				 struct usb_bus *bus, unsigned port1)
+{
+	struct usb_device *dev;
+	struct usb_hcd *usb_hcd = bus_to_hcd(bus);
+	unsigned root_hub = 0;
+	unsigned raw_port = port1;
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return NULL;
+
+	if (!usb_get_hcd(usb_hcd)) {
+		kfree(dev);
+		return NULL;
+	}
+	/* Root hubs aren't true devices, so don't allocate HCD resources */
+	if (usb_hcd->driver->alloc_dev && parent &&
+		!usb_hcd->driver->alloc_dev(usb_hcd, dev)) {
+		usb_put_hcd(bus_to_hcd(bus));
+		kfree(dev);
+		return NULL;
+	}
+
+	device_initialize(&dev->dev);
+	dev->dev.bus = &usb_bus_type;
+	dev->dev.type = &usb_device_type;
+	dev->dev.groups = usb_device_groups;
+	set_dev_node(&dev->dev, dev_to_node(bus->sysdev));
+	dev->state = USB_STATE_ATTACHED;
+	dev->lpm_disable_count = 1;
+	atomic_set(&dev->urbnum, 0);
+
+	INIT_LIST_HEAD(&dev->ep0.urb_list);
+	dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE;
+	dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT;
+	/* ep0 maxpacket comes later, from device descriptor */
+	usb_enable_endpoint(dev, &dev->ep0, false);
+	dev->can_submit = 1;
+
+	/* Save readable and stable topology id, distinguishing devices
+	 * by location for diagnostics, tools, driver model, etc.  The
+	 * string is a path along hub ports, from the root.  Each device's
+	 * dev->devpath will be stable until USB is re-cabled, and hubs
+	 * are often labeled with these port numbers.  The name isn't
+	 * as stable:  bus->busnum changes easily from modprobe order,
+	 * cardbus or pci hotplugging, and so on.
+	 */
+	if (unlikely(!parent)) {
+		dev->devpath[0] = '0';
+		dev->route = 0;
+
+		dev->dev.parent = bus->controller;
+		device_set_of_node_from_dev(&dev->dev, bus->sysdev);
+		dev_set_name(&dev->dev, "usb%d", bus->busnum);
+		root_hub = 1;
+	} else {
+		/* match any labeling on the hubs; it's one-based */
+		if (parent->devpath[0] == '0') {
+			snprintf(dev->devpath, sizeof dev->devpath,
+				"%d", port1);
+			/* Root ports are not counted in route string */
+			dev->route = 0;
+		} else {
+			snprintf(dev->devpath, sizeof dev->devpath,
+				"%s.%d", parent->devpath, port1);
+			/* Route string assumes hubs have less than 16 ports */
+			if (port1 < 15)
+				dev->route = parent->route +
+					(port1 << ((parent->level - 1)*4));
+			else
+				dev->route = parent->route +
+					(15 << ((parent->level - 1)*4));
+		}
+
+		dev->dev.parent = &parent->dev;
+		dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath);
+
+		if (!parent->parent) {
+			/* device under root hub's port */
+			raw_port = usb_hcd_find_raw_port_number(usb_hcd,
+				port1);
+		}
+		dev->dev.of_node = usb_of_get_device_node(parent, raw_port);
+
+		/* hub driver sets up TT records */
+	}
+
+	dev->portnum = port1;
+	dev->bus = bus;
+	dev->parent = parent;
+	INIT_LIST_HEAD(&dev->filelist);
+
+#ifdef	CONFIG_PM
+	pm_runtime_set_autosuspend_delay(&dev->dev,
+			usb_autosuspend_delay * 1000);
+	dev->connect_time = jiffies;
+	dev->active_duration = -jiffies;
+#endif
+
+	dev->authorized = usb_dev_authorized(dev, usb_hcd);
+	if (!root_hub)
+		dev->wusb = usb_bus_is_wusb(bus) ? 1 : 0;
+
+	return dev;
+}
+EXPORT_SYMBOL_GPL(usb_alloc_dev);
+
+/**
+ * usb_get_dev - increments the reference count of the usb device structure
+ * @dev: the device being referenced
+ *
+ * Each live reference to a device should be refcounted.
+ *
+ * Drivers for USB interfaces should normally record such references in
+ * their probe() methods, when they bind to an interface, and release
+ * them by calling usb_put_dev(), in their disconnect() methods.
+ * However, if a driver does not access the usb_device structure after
+ * its disconnect() method returns then refcounting is not necessary,
+ * because the USB core guarantees that a usb_device will not be
+ * deallocated until after all of its interface drivers have been unbound.
+ *
+ * Return: A pointer to the device with the incremented reference counter.
+ */
+struct usb_device *usb_get_dev(struct usb_device *dev)
+{
+	if (dev)
+		get_device(&dev->dev);
+	return dev;
+}
+EXPORT_SYMBOL_GPL(usb_get_dev);
+
+/**
+ * usb_put_dev - release a use of the usb device structure
+ * @dev: device that's been disconnected
+ *
+ * Must be called when a user of a device is finished with it.  When the last
+ * user of the device calls this function, the memory of the device is freed.
+ */
+void usb_put_dev(struct usb_device *dev)
+{
+	if (dev)
+		put_device(&dev->dev);
+}
+EXPORT_SYMBOL_GPL(usb_put_dev);
+
+/**
+ * usb_get_intf - increments the reference count of the usb interface structure
+ * @intf: the interface being referenced
+ *
+ * Each live reference to a interface must be refcounted.
+ *
+ * Drivers for USB interfaces should normally record such references in
+ * their probe() methods, when they bind to an interface, and release
+ * them by calling usb_put_intf(), in their disconnect() methods.
+ * However, if a driver does not access the usb_interface structure after
+ * its disconnect() method returns then refcounting is not necessary,
+ * because the USB core guarantees that a usb_interface will not be
+ * deallocated until after its driver has been unbound.
+ *
+ * Return: A pointer to the interface with the incremented reference counter.
+ */
+struct usb_interface *usb_get_intf(struct usb_interface *intf)
+{
+	if (intf)
+		get_device(&intf->dev);
+	return intf;
+}
+EXPORT_SYMBOL_GPL(usb_get_intf);
+
+/**
+ * usb_put_intf - release a use of the usb interface structure
+ * @intf: interface that's been decremented
+ *
+ * Must be called when a user of an interface is finished with it.  When the
+ * last user of the interface calls this function, the memory of the interface
+ * is freed.
+ */
+void usb_put_intf(struct usb_interface *intf)
+{
+	if (intf)
+		put_device(&intf->dev);
+}
+EXPORT_SYMBOL_GPL(usb_put_intf);
+
+/**
+ * usb_intf_get_dma_device - acquire a reference on the usb interface's DMA endpoint
+ * @intf: the usb interface
+ *
+ * While a USB device cannot perform DMA operations by itself, many USB
+ * controllers can. A call to usb_intf_get_dma_device() returns the DMA endpoint
+ * for the given USB interface, if any. The returned device structure must be
+ * released with put_device().
+ *
+ * See also usb_get_dma_device().
+ *
+ * Returns: A reference to the usb interface's DMA endpoint; or NULL if none
+ *          exists.
+ */
+struct device *usb_intf_get_dma_device(struct usb_interface *intf)
+{
+	struct usb_device *udev = interface_to_usbdev(intf);
+	struct device *dmadev;
+
+	if (!udev->bus)
+		return NULL;
+
+	dmadev = get_device(udev->bus->sysdev);
+	if (!dmadev || !dmadev->dma_mask) {
+		put_device(dmadev);
+		return NULL;
+	}
+
+	return dmadev;
+}
+EXPORT_SYMBOL_GPL(usb_intf_get_dma_device);
+
+/*			USB device locking
+ *
+ * USB devices and interfaces are locked using the semaphore in their
+ * embedded struct device.  The hub driver guarantees that whenever a
+ * device is connected or disconnected, drivers are called with the
+ * USB device locked as well as their particular interface.
+ *
+ * Complications arise when several devices are to be locked at the same
+ * time.  Only hub-aware drivers that are part of usbcore ever have to
+ * do this; nobody else needs to worry about it.  The rule for locking
+ * is simple:
+ *
+ *	When locking both a device and its parent, always lock the
+ *	parent first.
+ */
+
+/**
+ * usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure
+ * @udev: device that's being locked
+ * @iface: interface bound to the driver making the request (optional)
+ *
+ * Attempts to acquire the device lock, but fails if the device is
+ * NOTATTACHED or SUSPENDED, or if iface is specified and the interface
+ * is neither BINDING nor BOUND.  Rather than sleeping to wait for the
+ * lock, the routine polls repeatedly.  This is to prevent deadlock with
+ * disconnect; in some drivers (such as usb-storage) the disconnect()
+ * or suspend() method will block waiting for a device reset to complete.
+ *
+ * Return: A negative error code for failure, otherwise 0.
+ */
+int usb_lock_device_for_reset(struct usb_device *udev,
+			      const struct usb_interface *iface)
+{
+	unsigned long jiffies_expire = jiffies + HZ;
+
+	if (udev->state == USB_STATE_NOTATTACHED)
+		return -ENODEV;
+	if (udev->state == USB_STATE_SUSPENDED)
+		return -EHOSTUNREACH;
+	if (iface && (iface->condition == USB_INTERFACE_UNBINDING ||
+			iface->condition == USB_INTERFACE_UNBOUND))
+		return -EINTR;
+
+	while (!usb_trylock_device(udev)) {
+
+		/* If we can't acquire the lock after waiting one second,
+		 * we're probably deadlocked */
+		if (time_after(jiffies, jiffies_expire))
+			return -EBUSY;
+
+		msleep(15);
+		if (udev->state == USB_STATE_NOTATTACHED)
+			return -ENODEV;
+		if (udev->state == USB_STATE_SUSPENDED)
+			return -EHOSTUNREACH;
+		if (iface && (iface->condition == USB_INTERFACE_UNBINDING ||
+				iface->condition == USB_INTERFACE_UNBOUND))
+			return -EINTR;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_lock_device_for_reset);
+
+/**
+ * usb_get_current_frame_number - return current bus frame number
+ * @dev: the device whose bus is being queried
+ *
+ * Return: The current frame number for the USB host controller used
+ * with the given USB device. This can be used when scheduling
+ * isochronous requests.
+ *
+ * Note: Different kinds of host controller have different "scheduling
+ * horizons". While one type might support scheduling only 32 frames
+ * into the future, others could support scheduling up to 1024 frames
+ * into the future.
+ *
+ */
+int usb_get_current_frame_number(struct usb_device *dev)
+{
+	return usb_hcd_get_frame_number(dev);
+}
+EXPORT_SYMBOL_GPL(usb_get_current_frame_number);
+
+/*-------------------------------------------------------------------*/
+/*
+ * __usb_get_extra_descriptor() finds a descriptor of specific type in the
+ * extra field of the interface and endpoint descriptor structs.
+ */
+
+int __usb_get_extra_descriptor(char *buffer, unsigned size,
+			       unsigned char type, void **ptr, size_t minsize)
+{
+	struct usb_descriptor_header *header;
+
+	while (size >= sizeof(struct usb_descriptor_header)) {
+		header = (struct usb_descriptor_header *)buffer;
+
+		if (header->bLength < 2 || header->bLength > size) {
+			printk(KERN_ERR
+				"%s: bogus descriptor, type %d length %d\n",
+				usbcore_name,
+				header->bDescriptorType,
+				header->bLength);
+			return -1;
+		}
+
+		if (header->bDescriptorType == type && header->bLength >= minsize) {
+			*ptr = header;
+			return 0;
+		}
+
+		buffer += header->bLength;
+		size -= header->bLength;
+	}
+	return -1;
+}
+EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor);
+
+/**
+ * usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
+ * @dev: device the buffer will be used with
+ * @size: requested buffer size
+ * @mem_flags: affect whether allocation may block
+ * @dma: used to return DMA address of buffer
+ *
+ * Return: Either null (indicating no buffer could be allocated), or the
+ * cpu-space pointer to a buffer that may be used to perform DMA to the
+ * specified device.  Such cpu-space buffers are returned along with the DMA
+ * address (through the pointer provided).
+ *
+ * Note:
+ * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags
+ * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU
+ * hardware during URB completion/resubmit.  The implementation varies between
+ * platforms, depending on details of how DMA will work to this device.
+ * Using these buffers also eliminates cacheline sharing problems on
+ * architectures where CPU caches are not DMA-coherent.  On systems without
+ * bus-snooping caches, these buffers are uncached.
+ *
+ * When the buffer is no longer used, free it with usb_free_coherent().
+ */
+void *usb_alloc_coherent(struct usb_device *dev, size_t size, gfp_t mem_flags,
+			 dma_addr_t *dma)
+{
+	if (!dev || !dev->bus)
+		return NULL;
+	return hcd_buffer_alloc(dev->bus, size, mem_flags, dma);
+}
+EXPORT_SYMBOL_GPL(usb_alloc_coherent);
+
+/**
+ * usb_free_coherent - free memory allocated with usb_alloc_coherent()
+ * @dev: device the buffer was used with
+ * @size: requested buffer size
+ * @addr: CPU address of buffer
+ * @dma: DMA address of buffer
+ *
+ * This reclaims an I/O buffer, letting it be reused.  The memory must have
+ * been allocated using usb_alloc_coherent(), and the parameters must match
+ * those provided in that allocation request.
+ */
+void usb_free_coherent(struct usb_device *dev, size_t size, void *addr,
+		       dma_addr_t dma)
+{
+	if (!dev || !dev->bus)
+		return;
+	if (!addr)
+		return;
+	hcd_buffer_free(dev->bus, size, addr, dma);
+}
+EXPORT_SYMBOL_GPL(usb_free_coherent);
+
+/*
+ * Notifications of device and interface registration
+ */
+static int usb_bus_notify(struct notifier_block *nb, unsigned long action,
+		void *data)
+{
+	struct device *dev = data;
+
+	switch (action) {
+	case BUS_NOTIFY_ADD_DEVICE:
+		if (dev->type == &usb_device_type)
+			(void) usb_create_sysfs_dev_files(to_usb_device(dev));
+		else if (dev->type == &usb_if_device_type)
+			usb_create_sysfs_intf_files(to_usb_interface(dev));
+		break;
+
+	case BUS_NOTIFY_DEL_DEVICE:
+		if (dev->type == &usb_device_type)
+			usb_remove_sysfs_dev_files(to_usb_device(dev));
+		else if (dev->type == &usb_if_device_type)
+			usb_remove_sysfs_intf_files(to_usb_interface(dev));
+		break;
+	}
+	return 0;
+}
+
+static struct notifier_block usb_bus_nb = {
+	.notifier_call = usb_bus_notify,
+};
+
+static void usb_debugfs_init(void)
+{
+	debugfs_create_file("devices", 0444, usb_debug_root, NULL,
+			    &usbfs_devices_fops);
+}
+
+static void usb_debugfs_cleanup(void)
+{
+	debugfs_lookup_and_remove("devices", usb_debug_root);
+}
+
+/*
+ * Init
+ */
+static int __init usb_init(void)
+{
+	int retval;
+	if (usb_disabled()) {
+		pr_info("%s: USB support disabled\n", usbcore_name);
+		return 0;
+	}
+	usb_init_pool_max();
+
+	usb_debugfs_init();
+
+	usb_acpi_register();
+	retval = bus_register(&usb_bus_type);
+	if (retval)
+		goto bus_register_failed;
+	retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb);
+	if (retval)
+		goto bus_notifier_failed;
+	retval = usb_major_init();
+	if (retval)
+		goto major_init_failed;
+	retval = usb_register(&usbfs_driver);
+	if (retval)
+		goto driver_register_failed;
+	retval = usb_devio_init();
+	if (retval)
+		goto usb_devio_init_failed;
+	retval = usb_hub_init();
+	if (retval)
+		goto hub_init_failed;
+	retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE);
+	if (!retval)
+		goto out;
+
+	usb_hub_cleanup();
+hub_init_failed:
+	usb_devio_cleanup();
+usb_devio_init_failed:
+	usb_deregister(&usbfs_driver);
+driver_register_failed:
+	usb_major_cleanup();
+major_init_failed:
+	bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
+bus_notifier_failed:
+	bus_unregister(&usb_bus_type);
+bus_register_failed:
+	usb_acpi_unregister();
+	usb_debugfs_cleanup();
+out:
+	return retval;
+}
+
+/*
+ * Cleanup
+ */
+static void __exit usb_exit(void)
+{
+	/* This will matter if shutdown/reboot does exitcalls. */
+	if (usb_disabled())
+		return;
+
+	usb_release_quirk_list();
+	usb_deregister_device_driver(&usb_generic_driver);
+	usb_major_cleanup();
+	usb_deregister(&usbfs_driver);
+	usb_devio_cleanup();
+	usb_hub_cleanup();
+	bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
+	bus_unregister(&usb_bus_type);
+	usb_acpi_unregister();
+	usb_debugfs_cleanup();
+	idr_destroy(&usb_bus_idr);
+}
+
+subsys_initcall(usb_init);
+module_exit(usb_exit);
+MODULE_LICENSE("GPL");