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 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __LINUX_USB_H
 #define __LINUX_USB_H
 
 #include <linux/mod_devicetable.h>
 #include <linux/usb/ch9.h>
 
 #define USB_MAJOR           180
 #define USB_DEVICE_MAJOR        189
 
 
 #ifdef __KERNEL__
 
 #include <linux/errno.h>        /* for -ENODEV */
 #include <linux/delay.h>    /* for mdelay() */
 #include <linux/interrupt.h>    /* for in_interrupt() */
 #include <linux/list.h>     /* for struct list_head */
 #include <linux/kref.h>     /* for struct kref */
 #include <linux/device.h>   /* for struct device */
 #include <linux/fs.h>       /* for struct file_operations */
 #include <linux/completion.h>   /* for struct completion */
 #include <linux/sched.h>    /* for current && schedule_timeout */
 #include <linux/mutex.h>    /* for struct mutex */
 #include <linux/pm_runtime.h>   /* for runtime PM */
 
 struct usb_device;
 struct usb_driver;
 struct wusb_dev;
 
 /*-------------------------------------------------------------------------*/
 
 /*
  * Host-side wrappers for standard USB descriptors ... these are parsed
  * from the data provided by devices.  Parsing turns them from a flat
  * sequence of descriptors into a hierarchy:
  *
  *  - devices have one (usually) or more configs;
  *  - configs have one (often) or more interfaces;
  *  - interfaces have one (usually) or more settings;
  *  - each interface setting has zero or (usually) more endpoints.
  *  - a SuperSpeed endpoint has a companion descriptor
  *
  * And there might be other descriptors mixed in with those.
  *
  * Devices may also have class-specific or vendor-specific descriptors.
  */
 
 struct ep_device;
 
 /**
  * struct usb_host_endpoint - host-side endpoint descriptor and queue
  * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder
  * @ss_ep_comp: SuperSpeed companion descriptor for this endpoint
  * @ssp_isoc_ep_comp: SuperSpeedPlus isoc companion descriptor for this endpoint
  * @urb_list: urbs queued to this endpoint; maintained by usbcore
  * @hcpriv: for use by HCD; typically holds hardware dma queue head (QH)
  *  with one or more transfer descriptors (TDs) per urb
  * @ep_dev: ep_device for sysfs info
  * @extra: descriptors following this endpoint in the configuration
  * @extralen: how many bytes of "extra" are valid
  * @enabled: URBs may be submitted to this endpoint
  * @streams: number of USB-3 streams allocated on the endpoint
  *
  * USB requests are always queued to a given endpoint, identified by a
  * descriptor within an active interface in a given USB configuration.
  */
 struct usb_host_endpoint {
     struct usb_endpoint_descriptor      desc;
     struct usb_ss_ep_comp_descriptor    ss_ep_comp;
     struct usb_ssp_isoc_ep_comp_descriptor  ssp_isoc_ep_comp;
     struct list_head        urb_list;
     void                *hcpriv;
     struct ep_device        *ep_dev;    /* For sysfs info */
 
     unsigned char *extra;   /* Extra descriptors */
     int extralen;
     int enabled;
     int streams;
 };
 
 /* host-side wrapper for one interface setting's parsed descriptors */
 struct usb_host_interface {
     struct usb_interface_descriptor desc;
 
     int extralen;
     unsigned char *extra;   /* Extra descriptors */
 
     /* array of desc.bNumEndpoints endpoints associated with this
      * interface setting.  these will be in no particular order.
      */
     struct usb_host_endpoint *endpoint;
 
     char *string;       /* iInterface string, if present */
 };
 
 enum usb_interface_condition {
     USB_INTERFACE_UNBOUND = 0,
     USB_INTERFACE_BINDING,
     USB_INTERFACE_BOUND,
     USB_INTERFACE_UNBINDING,
 };
 
 int __must_check
 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);
 
 int __must_check
 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);
 
 static inline int __must_check
 usb_find_bulk_in_endpoint(struct usb_host_interface *alt,
         struct usb_endpoint_descriptor **bulk_in)
 {
     return usb_find_common_endpoints(alt, bulk_in, NULL, NULL, NULL);
 }
 
 static inline int __must_check
 usb_find_bulk_out_endpoint(struct usb_host_interface *alt,
         struct usb_endpoint_descriptor **bulk_out)
 {
     return usb_find_common_endpoints(alt, NULL, bulk_out, NULL, NULL);
 }
 
 static inline int __must_check
 usb_find_int_in_endpoint(struct usb_host_interface *alt,
         struct usb_endpoint_descriptor **int_in)
 {
     return usb_find_common_endpoints(alt, NULL, NULL, int_in, NULL);
 }
 
 static inline int __must_check
 usb_find_int_out_endpoint(struct usb_host_interface *alt,
         struct usb_endpoint_descriptor **int_out)
 {
     return usb_find_common_endpoints(alt, NULL, NULL, NULL, int_out);
 }
 
 static inline int __must_check
 usb_find_last_bulk_in_endpoint(struct usb_host_interface *alt,
         struct usb_endpoint_descriptor **bulk_in)
 {
     return usb_find_common_endpoints_reverse(alt, bulk_in, NULL, NULL, NULL);
 }
 
 static inline int __must_check
 usb_find_last_bulk_out_endpoint(struct usb_host_interface *alt,
         struct usb_endpoint_descriptor **bulk_out)
 {
     return usb_find_common_endpoints_reverse(alt, NULL, bulk_out, NULL, NULL);
 }
 
 static inline int __must_check
 usb_find_last_int_in_endpoint(struct usb_host_interface *alt,
         struct usb_endpoint_descriptor **int_in)
 {
     return usb_find_common_endpoints_reverse(alt, NULL, NULL, int_in, NULL);
 }
 
 static inline int __must_check
 usb_find_last_int_out_endpoint(struct usb_host_interface *alt,
         struct usb_endpoint_descriptor **int_out)
 {
     return usb_find_common_endpoints_reverse(alt, NULL, NULL, NULL, int_out);
 }
 
 /**
  * struct usb_interface - what usb device drivers talk to
  * @altsetting: array of interface structures, one for each alternate
  *  setting that may be selected.  Each one includes a set of
  *  endpoint configurations.  They will be in no particular order.
  * @cur_altsetting: the current altsetting.
  * @num_altsetting: number of altsettings defined.
  * @intf_assoc: interface association descriptor
  * @minor: the minor number assigned to this interface, if this
  *  interface is bound to a driver that uses the USB major number.
  *  If this interface does not use the USB major, this field should
  *  be unused.  The driver should set this value in the probe()
  *  function of the driver, after it has been assigned a minor
  *  number from the USB core by calling usb_register_dev().
  * @condition: binding state of the interface: not bound, binding
  *  (in probe()), bound to a driver, or unbinding (in disconnect())
  * @sysfs_files_created: sysfs attributes exist
  * @ep_devs_created: endpoint child pseudo-devices exist
  * @unregistering: flag set when the interface is being unregistered
  * @needs_remote_wakeup: flag set when the driver requires remote-wakeup
  *  capability during autosuspend.
  * @needs_altsetting0: flag set when a set-interface request for altsetting 0
  *  has been deferred.
  * @needs_binding: flag set when the driver should be re-probed or unbound
  *  following a reset or suspend operation it doesn't support.
  * @authorized: This allows to (de)authorize individual interfaces instead
  *  a whole device in contrast to the device authorization.
  * @dev: driver model's view of this device
  * @usb_dev: if an interface is bound to the USB major, this will point
  *  to the sysfs representation for that device.
  * @reset_ws: Used for scheduling resets from atomic context.
  * @resetting_device: USB core reset the device, so use alt setting 0 as
  *  current; needs bandwidth alloc after reset.
  *
  * USB device drivers attach to interfaces on a physical device.  Each
  * interface encapsulates a single high level function, such as feeding
  * an audio stream to a speaker or reporting a change in a volume control.
  * Many USB devices only have one interface.  The protocol used to talk to
  * an interface's endpoints can be defined in a usb "class" specification,
  * or by a product's vendor.  The (default) control endpoint is part of
  * every interface, but is never listed among the interface's descriptors.
  *
  * The driver that is bound to the interface can use standard driver model
  * calls such as dev_get_drvdata() on the dev member of this structure.
  *
  * Each interface may have alternate settings.  The initial configuration
  * of a device sets altsetting 0, but the device driver can change
  * that setting using usb_set_interface().  Alternate settings are often
  * used to control the use of periodic endpoints, such as by having
  * different endpoints use different amounts of reserved USB bandwidth.
  * All standards-conformant USB devices that use isochronous endpoints
  * will use them in non-default settings.
  *
  * The USB specification says that alternate setting numbers must run from
  * 0 to one less than the total number of alternate settings.  But some
  * devices manage to mess this up, and the structures aren't necessarily
  * stored in numerical order anyhow.  Use usb_altnum_to_altsetting() to
  * look up an alternate setting in the altsetting array based on its number.
  */
 struct usb_interface {
     /* array of alternate settings for this interface,
      * stored in no particular order */
     struct usb_host_interface *altsetting;
 
     struct usb_host_interface *cur_altsetting;  /* the currently
                      * active alternate setting */
     unsigned num_altsetting;    /* number of alternate settings */
 
     /* If there is an interface association descriptor then it will list
      * the associated interfaces */
     struct usb_interface_assoc_descriptor *intf_assoc;
 
     int minor;          /* minor number this interface is
                      * bound to */
     enum usb_interface_condition condition;     /* state of binding */
     unsigned sysfs_files_created:1; /* the sysfs attributes exist */
     unsigned ep_devs_created:1; /* endpoint "devices" exist */
     unsigned unregistering:1;   /* unregistration is in progress */
     unsigned needs_remote_wakeup:1; /* driver requires remote wakeup */
     unsigned needs_altsetting0:1;   /* switch to altsetting 0 is pending */
     unsigned needs_binding:1;   /* needs delayed unbind/rebind */
     unsigned resetting_device:1;    /* true: bandwidth alloc after reset */
     unsigned authorized:1;      /* used for interface authorization */
 
     struct device dev;      /* interface specific device info */
     struct device *usb_dev;
     struct work_struct reset_ws;    /* for resets in atomic context */
 };
 #define to_usb_interface(d) container_of(d, struct usb_interface, dev)
 
 static inline void *usb_get_intfdata(struct usb_interface *intf)
 {
     return dev_get_drvdata(&intf->dev);
 }
 
 static inline void usb_set_intfdata(struct usb_interface *intf, void *data)
 {
     dev_set_drvdata(&intf->dev, data);
 }
 
 struct usb_interface *usb_get_intf(struct usb_interface *intf);
 void usb_put_intf(struct usb_interface *intf);
 
 /* Hard limit */
 #define USB_MAXENDPOINTS    30
 /* this maximum is arbitrary */
 #define USB_MAXINTERFACES   32
 #define USB_MAXIADS     (USB_MAXINTERFACES/2)
 
 /*
  * USB Resume Timer: Every Host controller driver should drive the resume
  * signalling on the bus for the amount of time defined by this macro.
  *
  * That way we will have a 'stable' behavior among all HCDs supported by Linux.
  *
  * Note that the USB Specification states we should drive resume for *at least*
  * 20 ms, but it doesn't give an upper bound. This creates two possible
  * situations which we want to avoid:
  *
  * (a) sometimes an msleep(20) might expire slightly before 20 ms, which causes
  * us to fail USB Electrical Tests, thus failing Certification
  *
  * (b) Some (many) devices actually need more than 20 ms of resume signalling,
  * and while we can argue that's against the USB Specification, we don't have
  * control over which devices a certification laboratory will be using for
  * certification. If CertLab uses a device which was tested against Windows and
  * that happens to have relaxed resume signalling rules, we might fall into
  * situations where we fail interoperability and electrical tests.
  *
  * In order to avoid both conditions, we're using a 40 ms resume timeout, which
  * should cope with both LPJ calibration errors and devices not following every
  * detail of the USB Specification.
  */
 #define USB_RESUME_TIMEOUT  40 /* ms */
 
 /**
  * struct usb_interface_cache - long-term representation of a device interface
  * @num_altsetting: number of altsettings defined.
  * @ref: reference counter.
  * @altsetting: variable-length array of interface structures, one for
  *  each alternate setting that may be selected.  Each one includes a
  *  set of endpoint configurations.  They will be in no particular order.
  *
  * These structures persist for the lifetime of a usb_device, unlike
  * struct usb_interface (which persists only as long as its configuration
  * is installed).  The altsetting arrays can be accessed through these
  * structures at any time, permitting comparison of configurations and
  * providing support for the /sys/kernel/debug/usb/devices pseudo-file.
  */
 struct usb_interface_cache {
     unsigned num_altsetting;    /* number of alternate settings */
     struct kref ref;        /* reference counter */
 
     /* variable-length array of alternate settings for this interface,
      * stored in no particular order */
     struct usb_host_interface altsetting[];
 };
 #define ref_to_usb_interface_cache(r) \
         container_of(r, struct usb_interface_cache, ref)
 #define altsetting_to_usb_interface_cache(a) \
         container_of(a, struct usb_interface_cache, altsetting[0])
 
 /**
  * struct usb_host_config - representation of a device's configuration
  * @desc: the device's configuration descriptor.
  * @string: pointer to the cached version of the iConfiguration string, if
  *  present for this configuration.
  * @intf_assoc: list of any interface association descriptors in this config
  * @interface: array of pointers to usb_interface structures, one for each
  *  interface in the configuration.  The number of interfaces is stored
  *  in desc.bNumInterfaces.  These pointers are valid only while the
  *  configuration is active.
  * @intf_cache: array of pointers to usb_interface_cache structures, one
  *  for each interface in the configuration.  These structures exist
  *  for the entire life of the device.
  * @extra: pointer to buffer containing all extra descriptors associated
  *  with this configuration (those preceding the first interface
  *  descriptor).
  * @extralen: length of the extra descriptors buffer.
  *
  * USB devices may have multiple configurations, but only one can be active
  * at any time.  Each encapsulates a different operational environment;
  * for example, a dual-speed device would have separate configurations for
  * full-speed and high-speed operation.  The number of configurations
  * available is stored in the device descriptor as bNumConfigurations.
  *
  * A configuration can contain multiple interfaces.  Each corresponds to
  * a different function of the USB device, and all are available whenever
  * the configuration is active.  The USB standard says that interfaces
  * are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot
  * of devices get this wrong.  In addition, the interface array is not
  * guaranteed to be sorted in numerical order.  Use usb_ifnum_to_if() to
  * look up an interface entry based on its number.
  *
  * Device drivers should not attempt to activate configurations.  The choice
  * of which configuration to install is a policy decision based on such
  * considerations as available power, functionality provided, and the user's
  * desires (expressed through userspace tools).  However, drivers can call
  * usb_reset_configuration() to reinitialize the current configuration and
  * all its interfaces.
  */
 struct usb_host_config {
     struct usb_config_descriptor    desc;
 
     char *string;       /* iConfiguration string, if present */
 
     /* List of any Interface Association Descriptors in this
      * configuration. */
     struct usb_interface_assoc_descriptor *intf_assoc[USB_MAXIADS];
 
     /* the interfaces associated with this configuration,
      * stored in no particular order */
     struct usb_interface *interface[USB_MAXINTERFACES];
 
     /* Interface information available even when this is not the
      * active configuration */
     struct usb_interface_cache *intf_cache[USB_MAXINTERFACES];
 
     unsigned char *extra;   /* Extra descriptors */
     int extralen;
 };
 
 /* USB2.0 and USB3.0 device BOS descriptor set */
 struct usb_host_bos {
     struct usb_bos_descriptor   *desc;
 
     /* wireless cap descriptor is handled by wusb */
     struct usb_ext_cap_descriptor   *ext_cap;
     struct usb_ss_cap_descriptor    *ss_cap;
     struct usb_ssp_cap_descriptor   *ssp_cap;
     struct usb_ss_container_id_descriptor   *ss_id;
     struct usb_ptm_cap_descriptor   *ptm_cap;
 };
 
 int __usb_get_extra_descriptor(char *buffer, unsigned size,
     unsigned char type, void **ptr, size_t min);
 #define usb_get_extra_descriptor(ifpoint, type, ptr) \
                 __usb_get_extra_descriptor((ifpoint)->extra, \
                 (ifpoint)->extralen, \
                 type, (void **)ptr, sizeof(**(ptr)))
 
 /* ----------------------------------------------------------------------- */
 
 /* USB device number allocation bitmap */
 struct usb_devmap {
     unsigned long devicemap[128 / (8*sizeof(unsigned long))];
 };
 
 /*
  * Allocated per bus (tree of devices) we have:
  */
 struct usb_bus {
     struct device *controller;  /* host side hardware */
     struct device *sysdev;      /* as seen from firmware or bus */
     int busnum;         /* Bus number (in order of reg) */
     const char *bus_name;       /* stable id (PCI slot_name etc) */
     u8 uses_pio_for_control;    /*
                      * Does the host controller use PIO
                      * for control transfers?
                      */
     u8 otg_port;            /* 0, or number of OTG/HNP port */
     unsigned is_b_host:1;       /* true during some HNP roleswitches */
     unsigned b_hnp_enable:1;    /* OTG: did A-Host enable HNP? */
     unsigned no_stop_on_short:1;    /*
                      * Quirk: some controllers don't stop
                      * the ep queue on a short transfer
                      * with the URB_SHORT_NOT_OK flag set.
                      */
     unsigned no_sg_constraint:1;    /* no sg constraint */
     unsigned sg_tablesize;      /* 0 or largest number of sg list entries */
 
     int devnum_next;        /* Next open device number in
                      * round-robin allocation */
     struct mutex devnum_next_mutex; /* devnum_next mutex */
 
     struct usb_devmap devmap;   /* device address allocation map */
     struct usb_device *root_hub;    /* Root hub */
     struct usb_bus *hs_companion;   /* Companion EHCI bus, if any */
 
     int bandwidth_allocated;    /* on this bus: how much of the time
                      * reserved for periodic (intr/iso)
                      * requests is used, on average?
                      * Units: microseconds/frame.
                      * Limits: Full/low speed reserve 90%,
                      * while high speed reserves 80%.
                      */
     int bandwidth_int_reqs;     /* number of Interrupt requests */
     int bandwidth_isoc_reqs;    /* number of Isoc. requests */
 
     unsigned resuming_ports;    /* bit array: resuming root-hub ports */
 
 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
     struct mon_bus *mon_bus;    /* non-null when associated */
     int monitored;          /* non-zero when monitored */
 #endif
 };
 
 struct usb_dev_state;
 
 /* ----------------------------------------------------------------------- */
 
 struct usb_tt;
 
 enum usb_port_connect_type {
     USB_PORT_CONNECT_TYPE_UNKNOWN = 0,
     USB_PORT_CONNECT_TYPE_HOT_PLUG,
     USB_PORT_CONNECT_TYPE_HARD_WIRED,
     USB_PORT_NOT_USED,
 };
 
 /*
  * USB port quirks.
  */
 
 /* For the given port, prefer the old (faster) enumeration scheme. */
 #define USB_PORT_QUIRK_OLD_SCHEME   BIT(0)
 
 /* Decrease TRSTRCY to 10ms during device enumeration. */
 #define USB_PORT_QUIRK_FAST_ENUM    BIT(1)
 
 /*
  * USB 2.0 Link Power Management (LPM) parameters.
  */
 struct usb2_lpm_parameters {
     /* Best effort service latency indicate how long the host will drive
      * resume on an exit from L1.
      */
     unsigned int besl;
 
     /* Timeout value in microseconds for the L1 inactivity (LPM) timer.
      * When the timer counts to zero, the parent hub will initiate a LPM
      * transition to L1.
      */
     int timeout;
 };
 
 /*
  * USB 3.0 Link Power Management (LPM) parameters.
  *
  * PEL and SEL are USB 3.0 Link PM latencies for device-initiated LPM exit.
  * MEL is the USB 3.0 Link PM latency for host-initiated LPM exit.
  * All three are stored in nanoseconds.
  */
 struct usb3_lpm_parameters {
     /*
      * Maximum exit latency (MEL) for the host to send a packet to the
      * device (either a Ping for isoc endpoints, or a data packet for
      * interrupt endpoints), the hubs to decode the packet, and for all hubs
      * in the path to transition the links to U0.
      */
     unsigned int mel;
     /*
      * Maximum exit latency for a device-initiated LPM transition to bring
      * all links into U0.  Abbreviated as "PEL" in section 9.4.12 of the USB
      * 3.0 spec, with no explanation of what "P" stands for.  "Path"?
      */
     unsigned int pel;
 
     /*
      * The System Exit Latency (SEL) includes PEL, and three other
      * latencies.  After a device initiates a U0 transition, it will take
      * some time from when the device sends the ERDY to when it will finally
      * receive the data packet.  Basically, SEL should be the worse-case
      * latency from when a device starts initiating a U0 transition to when
      * it will get data.
      */
     unsigned int sel;
     /*
      * The idle timeout value that is currently programmed into the parent
      * hub for this device.  When the timer counts to zero, the parent hub
      * will initiate an LPM transition to either U1 or U2.
      */
     int timeout;
 };
 
 /**
  * struct usb_device - kernel's representation of a USB device
  * @devnum: device number; address on a USB bus
  * @devpath: device ID string for use in messages (e.g., /port/...)
  * @route: tree topology hex string for use with xHCI
  * @state: device state: configured, not attached, etc.
  * @speed: device speed: high/full/low (or error)
  * @rx_lanes: number of rx lanes in use, USB 3.2 adds dual-lane support
  * @tx_lanes: number of tx lanes in use, USB 3.2 adds dual-lane support
  * @ssp_rate: SuperSpeed Plus phy signaling rate and lane count
  * @tt: Transaction Translator info; used with low/full speed dev, highspeed hub
  * @ttport: device port on that tt hub
  * @toggle: one bit for each endpoint, with ([0] = IN, [1] = OUT) endpoints
  * @parent: our hub, unless we're the root
  * @bus: bus we're part of
  * @ep0: endpoint 0 data (default control pipe)
  * @dev: generic device interface
  * @descriptor: USB device descriptor
  * @bos: USB device BOS descriptor set
  * @config: all of the device's configs
  * @actconfig: the active configuration
  * @ep_in: array of IN endpoints
  * @ep_out: array of OUT endpoints
  * @rawdescriptors: raw descriptors for each config
  * @bus_mA: Current available from the bus
  * @portnum: parent port number (origin 1)
  * @level: number of USB hub ancestors
  * @devaddr: device address, XHCI: assigned by HW, others: same as devnum
  * @can_submit: URBs may be submitted
  * @persist_enabled:  USB_PERSIST enabled for this device
  * @reset_in_progress: the device is being reset
  * @have_langid: whether string_langid is valid
  * @authorized: policy has said we can use it;
  *  (user space) policy determines if we authorize this device to be
  *  used or not. By default, wired USB devices are authorized.
  *  WUSB devices are not, until we authorize them from user space.
  *  FIXME -- complete doc
  * @authenticated: Crypto authentication passed
  * @wusb: device is Wireless USB
  * @lpm_capable: device supports LPM
  * @lpm_devinit_allow: Allow USB3 device initiated LPM, exit latency is in range
  * @usb2_hw_lpm_capable: device can perform USB2 hardware LPM
  * @usb2_hw_lpm_besl_capable: device can perform USB2 hardware BESL LPM
  * @usb2_hw_lpm_enabled: USB2 hardware LPM is enabled
  * @usb2_hw_lpm_allowed: Userspace allows USB 2.0 LPM to be enabled
  * @usb3_lpm_u1_enabled: USB3 hardware U1 LPM enabled
  * @usb3_lpm_u2_enabled: USB3 hardware U2 LPM enabled
  * @string_langid: language ID for strings
  * @product: iProduct string, if present (static)
  * @manufacturer: iManufacturer string, if present (static)
  * @serial: iSerialNumber string, if present (static)
  * @filelist: usbfs files that are open to this device
  * @maxchild: number of ports if hub
  * @quirks: quirks of the whole device
  * @urbnum: number of URBs submitted for the whole device
  * @active_duration: total time device is not suspended
  * @connect_time: time device was first connected
  * @do_remote_wakeup:  remote wakeup should be enabled
  * @reset_resume: needs reset instead of resume
  * @port_is_suspended: the upstream port is suspended (L2 or U3)
  * @wusb_dev: if this is a Wireless USB device, link to the WUSB
  *  specific data for the device.
  * @slot_id: Slot ID assigned by xHCI
  * @removable: Device can be physically removed from this port
  * @l1_params: best effor service latency for USB2 L1 LPM state, and L1 timeout.
  * @u1_params: exit latencies for USB3 U1 LPM state, and hub-initiated timeout.
  * @u2_params: exit latencies for USB3 U2 LPM state, and hub-initiated timeout.
  * @lpm_disable_count: Ref count used by usb_disable_lpm() and usb_enable_lpm()
  *  to keep track of the number of functions that require USB 3.0 Link Power
  *  Management to be disabled for this usb_device.  This count should only
  *  be manipulated by those functions, with the bandwidth_mutex is held.
  * @hub_delay: cached value consisting of:
  *  parent->hub_delay + wHubDelay + tTPTransmissionDelay (40ns)
  *  Will be used as wValue for SetIsochDelay requests.
  * @use_generic_driver: ask driver core to reprobe using the generic driver.
  *
  * Notes:
  * Usbcore drivers should not set usbdev->state directly.  Instead use
  * usb_set_device_state().
  */
 struct usb_device {
     int     devnum;
     char        devpath[16];
     u32     route;
     enum usb_device_state   state;
     enum usb_device_speed   speed;
     unsigned int        rx_lanes;
     unsigned int        tx_lanes;
     enum usb_ssp_rate   ssp_rate;
 
     struct usb_tt   *tt;
     int     ttport;
 
     unsigned int toggle[2];
 
     struct usb_device *parent;
     struct usb_bus *bus;
     struct usb_host_endpoint ep0;
 
     struct device dev;
 
     struct usb_device_descriptor descriptor;
     struct usb_host_bos *bos;
     struct usb_host_config *config;
 
     struct usb_host_config *actconfig;
     struct usb_host_endpoint *ep_in[16];
     struct usb_host_endpoint *ep_out[16];
 
     char **rawdescriptors;
 
     unsigned short bus_mA;
     u8 portnum;
     u8 level;
     u8 devaddr;
 
     unsigned can_submit:1;
     unsigned persist_enabled:1;
     unsigned reset_in_progress:1;
     unsigned have_langid:1;
     unsigned authorized:1;
     unsigned authenticated:1;
     unsigned wusb:1;
     unsigned lpm_capable:1;
     unsigned lpm_devinit_allow:1;
     unsigned usb2_hw_lpm_capable:1;
     unsigned usb2_hw_lpm_besl_capable:1;
     unsigned usb2_hw_lpm_enabled:1;
     unsigned usb2_hw_lpm_allowed:1;
     unsigned usb3_lpm_u1_enabled:1;
     unsigned usb3_lpm_u2_enabled:1;
     int string_langid;
 
     /* static strings from the device */
     char *product;
     char *manufacturer;
     char *serial;
 
     struct list_head filelist;
 
     int maxchild;
 
     u32 quirks;
     atomic_t urbnum;
 
     unsigned long active_duration;
 
 #ifdef CONFIG_PM
     unsigned long connect_time;
 
     unsigned do_remote_wakeup:1;
     unsigned reset_resume:1;
     unsigned port_is_suspended:1;
 #endif
     struct wusb_dev *wusb_dev;
     int slot_id;
     struct usb2_lpm_parameters l1_params;
     struct usb3_lpm_parameters u1_params;
     struct usb3_lpm_parameters u2_params;
     unsigned lpm_disable_count;
 
     u16 hub_delay;
     unsigned use_generic_driver:1;
 };
 #define to_usb_device(d) container_of(d, struct usb_device, dev)
 
 static inline struct usb_device *interface_to_usbdev(struct usb_interface *intf)
 {
     return to_usb_device(intf->dev.parent);
 }
 
 extern struct usb_device *usb_get_dev(struct usb_device *dev);
 extern void usb_put_dev(struct usb_device *dev);
 extern struct usb_device *usb_hub_find_child(struct usb_device *hdev,
     int port1);
 
 /**
  * usb_hub_for_each_child - iterate over all child devices on the hub
  * @hdev:  USB device belonging to the usb hub
  * @port1: portnum associated with child device
  * @child: child device pointer
  */
 #define usb_hub_for_each_child(hdev, port1, child) \
     for (port1 = 1, child = usb_hub_find_child(hdev, port1); \
             port1 <= hdev->maxchild; \
             child = usb_hub_find_child(hdev, ++port1)) \
         if (!child) continue; else
 
 /* USB device locking */
 #define usb_lock_device(udev)           device_lock(&(udev)->dev)
 #define usb_unlock_device(udev)         device_unlock(&(udev)->dev)
 #define usb_lock_device_interruptible(udev) device_lock_interruptible(&(udev)->dev)
 #define usb_trylock_device(udev)        device_trylock(&(udev)->dev)
 extern int usb_lock_device_for_reset(struct usb_device *udev,
                      const struct usb_interface *iface);
 
 /* USB port reset for device reinitialization */
 extern int usb_reset_device(struct usb_device *dev);
 extern void usb_queue_reset_device(struct usb_interface *dev);
 
 extern struct device *usb_intf_get_dma_device(struct usb_interface *intf);
 
 #ifdef CONFIG_ACPI
 extern int usb_acpi_set_power_state(struct usb_device *hdev, int index,
     bool enable);
 extern bool usb_acpi_power_manageable(struct usb_device *hdev, int index);
 #else
 static inline int usb_acpi_set_power_state(struct usb_device *hdev, int index,
     bool enable) { return 0; }
 static inline bool usb_acpi_power_manageable(struct usb_device *hdev, int index)
     { return true; }
 #endif
 
 /* USB autosuspend and autoresume */
 #ifdef CONFIG_PM
 extern void usb_enable_autosuspend(struct usb_device *udev);
 extern void usb_disable_autosuspend(struct usb_device *udev);
 
 extern int usb_autopm_get_interface(struct usb_interface *intf);
 extern void usb_autopm_put_interface(struct usb_interface *intf);
 extern int usb_autopm_get_interface_async(struct usb_interface *intf);
 extern void usb_autopm_put_interface_async(struct usb_interface *intf);
 extern void usb_autopm_get_interface_no_resume(struct usb_interface *intf);
 extern void usb_autopm_put_interface_no_suspend(struct usb_interface *intf);
 
 static inline void usb_mark_last_busy(struct usb_device *udev)
 {
     pm_runtime_mark_last_busy(&udev->dev);
 }
 
 #else
 
 static inline int usb_enable_autosuspend(struct usb_device *udev)
 { return 0; }
 static inline int usb_disable_autosuspend(struct usb_device *udev)
 { return 0; }
 
 static inline int usb_autopm_get_interface(struct usb_interface *intf)
 { return 0; }
 static inline int usb_autopm_get_interface_async(struct usb_interface *intf)
 { return 0; }
 
 static inline void usb_autopm_put_interface(struct usb_interface *intf)
 { }
 static inline void usb_autopm_put_interface_async(struct usb_interface *intf)
 { }
 static inline void usb_autopm_get_interface_no_resume(
         struct usb_interface *intf)
 { }
 static inline void usb_autopm_put_interface_no_suspend(
         struct usb_interface *intf)
 { }
 static inline void usb_mark_last_busy(struct usb_device *udev)
 { }
 #endif
 
 extern int usb_disable_lpm(struct usb_device *udev);
 extern void usb_enable_lpm(struct usb_device *udev);
 /* Same as above, but these functions lock/unlock the bandwidth_mutex. */
 extern int usb_unlocked_disable_lpm(struct usb_device *udev);
 extern void usb_unlocked_enable_lpm(struct usb_device *udev);
 
 extern int usb_disable_ltm(struct usb_device *udev);
 extern void usb_enable_ltm(struct usb_device *udev);
 
 static inline bool usb_device_supports_ltm(struct usb_device *udev)
 {
     if (udev->speed < USB_SPEED_SUPER || !udev->bos || !udev->bos->ss_cap)
         return false;
     return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT;
 }
 
 static inline bool usb_device_no_sg_constraint(struct usb_device *udev)
 {
     return udev && udev->bus && udev->bus->no_sg_constraint;
 }
 
 
 /*-------------------------------------------------------------------------*/
 
 /* for drivers using iso endpoints */
 extern int usb_get_current_frame_number(struct usb_device *usb_dev);
 
 /* Sets up a group of bulk endpoints to support multiple stream IDs. */
 extern int usb_alloc_streams(struct usb_interface *interface,
         struct usb_host_endpoint **eps, unsigned int num_eps,
         unsigned int num_streams, gfp_t mem_flags);
 
 /* Reverts a group of bulk endpoints back to not using stream IDs. */
 extern int usb_free_streams(struct usb_interface *interface,
         struct usb_host_endpoint **eps, unsigned int num_eps,
         gfp_t mem_flags);
 
 /* used these for multi-interface device registration */
 extern int usb_driver_claim_interface(struct usb_driver *driver,
             struct usb_interface *iface, void *data);
 
 /**
  * usb_interface_claimed - returns true iff an interface is claimed
  * @iface: the interface being checked
  *
  * Return: %true (nonzero) iff the interface is claimed, else %false
  * (zero).
  *
  * Note:
  * Callers must own the driver model's usb bus readlock.  So driver
  * probe() entries don't need extra locking, but other call contexts
  * may need to explicitly claim that lock.
  *
  */
 static inline int usb_interface_claimed(struct usb_interface *iface)
 {
     return (iface->dev.driver != NULL);
 }
 
 extern void usb_driver_release_interface(struct usb_driver *driver,
             struct usb_interface *iface);
 const struct usb_device_id *usb_match_id(struct usb_interface *interface,
                      const struct usb_device_id *id);
 extern int usb_match_one_id(struct usb_interface *interface,
                 const struct usb_device_id *id);
 
 extern int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *));
 extern struct usb_interface *usb_find_interface(struct usb_driver *drv,
         int minor);
 extern struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev,
         unsigned ifnum);
 extern struct usb_host_interface *usb_altnum_to_altsetting(
         const struct usb_interface *intf, unsigned int altnum);
 extern struct usb_host_interface *usb_find_alt_setting(
         struct usb_host_config *config,
         unsigned int iface_num,
         unsigned int alt_num);
 
 /* port claiming functions */
 int usb_hub_claim_port(struct usb_device *hdev, unsigned port1,
         struct usb_dev_state *owner);
 int usb_hub_release_port(struct usb_device *hdev, unsigned port1,
         struct usb_dev_state *owner);
 
 /**
  * usb_make_path - returns stable device path in the usb tree
  * @dev: the device whose path is being constructed
  * @buf: where to put the string
  * @size: how big is "buf"?
  *
  * Return: Length of the string (> 0) or negative if size was too small.
  *
  * Note:
  * This identifier is intended to be "stable", reflecting physical paths in
  * hardware such as physical bus addresses for host controllers or ports on
  * USB hubs.  That makes it stay the same until systems are physically
  * reconfigured, by re-cabling a tree of USB devices or by moving USB host
  * controllers.  Adding and removing devices, including virtual root hubs
  * in host controller driver modules, does not change these path identifiers;
  * neither does rebooting or re-enumerating.  These are more useful identifiers
  * than changeable ("unstable") ones like bus numbers or device addresses.
  *
  * With a partial exception for devices connected to USB 2.0 root hubs, these
  * identifiers are also predictable.  So long as the device tree isn't changed,
  * plugging any USB device into a given hub port always gives it the same path.
  * Because of the use of "companion" controllers, devices connected to ports on
  * USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are
  * high speed, and a different one if they are full or low speed.
  */
 static inline int usb_make_path(struct usb_device *dev, char *buf, size_t size)
 {
     int actual;
     actual = snprintf(buf, size, "usb-%s-%s", dev->bus->bus_name,
               dev->devpath);
     return (actual >= (int)size) ? -1 : actual;
 }
 
 /*-------------------------------------------------------------------------*/
 
 #define USB_DEVICE_ID_MATCH_DEVICE \
         (USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT)
 #define USB_DEVICE_ID_MATCH_DEV_RANGE \
         (USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI)
 #define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION \
         (USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE)
 #define USB_DEVICE_ID_MATCH_DEV_INFO \
         (USB_DEVICE_ID_MATCH_DEV_CLASS | \
         USB_DEVICE_ID_MATCH_DEV_SUBCLASS | \
         USB_DEVICE_ID_MATCH_DEV_PROTOCOL)
 #define USB_DEVICE_ID_MATCH_INT_INFO \
         (USB_DEVICE_ID_MATCH_INT_CLASS | \
         USB_DEVICE_ID_MATCH_INT_SUBCLASS | \
         USB_DEVICE_ID_MATCH_INT_PROTOCOL)
 
 /**
  * USB_DEVICE - macro used to describe a specific usb device
  * @vend: the 16 bit USB Vendor ID
  * @prod: the 16 bit USB Product ID
  *
  * This macro is used to create a struct usb_device_id that matches a
  * specific device.
  */
 #define USB_DEVICE(vend, prod) \
     .match_flags = USB_DEVICE_ID_MATCH_DEVICE, \
     .idVendor = (vend), \
     .idProduct = (prod)
 /**
  * USB_DEVICE_VER - describe a specific usb device with a version range
  * @vend: the 16 bit USB Vendor ID
  * @prod: the 16 bit USB Product ID
  * @lo: the bcdDevice_lo value
  * @hi: the bcdDevice_hi value
  *
  * This macro is used to create a struct usb_device_id that matches a
  * specific device, with a version range.
  */
 #define USB_DEVICE_VER(vend, prod, lo, hi) \
     .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, \
     .idVendor = (vend), \
     .idProduct = (prod), \
     .bcdDevice_lo = (lo), \
     .bcdDevice_hi = (hi)
 
 /**
  * USB_DEVICE_INTERFACE_CLASS - describe a usb device with a specific interface class
  * @vend: the 16 bit USB Vendor ID
  * @prod: the 16 bit USB Product ID
  * @cl: bInterfaceClass value
  *
  * This macro is used to create a struct usb_device_id that matches a
  * specific interface class of devices.
  */
 #define USB_DEVICE_INTERFACE_CLASS(vend, prod, cl) \
     .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
                USB_DEVICE_ID_MATCH_INT_CLASS, \
     .idVendor = (vend), \
     .idProduct = (prod), \
     .bInterfaceClass = (cl)
 
 /**
  * USB_DEVICE_INTERFACE_PROTOCOL - describe a usb device with a specific interface protocol
  * @vend: the 16 bit USB Vendor ID
  * @prod: the 16 bit USB Product ID
  * @pr: bInterfaceProtocol value
  *
  * This macro is used to create a struct usb_device_id that matches a
  * specific interface protocol of devices.
  */
 #define USB_DEVICE_INTERFACE_PROTOCOL(vend, prod, pr) \
     .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
                USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
     .idVendor = (vend), \
     .idProduct = (prod), \
     .bInterfaceProtocol = (pr)
 
 /**
  * USB_DEVICE_INTERFACE_NUMBER - describe a usb device with a specific interface number
  * @vend: the 16 bit USB Vendor ID
  * @prod: the 16 bit USB Product ID
  * @num: bInterfaceNumber value
  *
  * This macro is used to create a struct usb_device_id that matches a
  * specific interface number of devices.
  */
 #define USB_DEVICE_INTERFACE_NUMBER(vend, prod, num) \
     .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
                USB_DEVICE_ID_MATCH_INT_NUMBER, \
     .idVendor = (vend), \
     .idProduct = (prod), \
     .bInterfaceNumber = (num)
 
 /**
  * USB_DEVICE_INFO - macro used to describe a class of usb devices
  * @cl: bDeviceClass value
  * @sc: bDeviceSubClass value
  * @pr: bDeviceProtocol value
  *
  * This macro is used to create a struct usb_device_id that matches a
  * specific class of devices.
  */
 #define USB_DEVICE_INFO(cl, sc, pr) \
     .match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, \
     .bDeviceClass = (cl), \
     .bDeviceSubClass = (sc), \
     .bDeviceProtocol = (pr)
 
 /**
  * USB_INTERFACE_INFO - macro used to describe a class of usb interfaces
  * @cl: bInterfaceClass value
  * @sc: bInterfaceSubClass value
  * @pr: bInterfaceProtocol value
  *
  * This macro is used to create a struct usb_device_id that matches a
  * specific class of interfaces.
  */
 #define USB_INTERFACE_INFO(cl, sc, pr) \
     .match_flags = USB_DEVICE_ID_MATCH_INT_INFO, \
     .bInterfaceClass = (cl), \
     .bInterfaceSubClass = (sc), \
     .bInterfaceProtocol = (pr)
 
 /**
  * USB_DEVICE_AND_INTERFACE_INFO - describe a specific usb device with a class of usb interfaces
  * @vend: the 16 bit USB Vendor ID
  * @prod: the 16 bit USB Product ID
  * @cl: bInterfaceClass value
  * @sc: bInterfaceSubClass value
  * @pr: bInterfaceProtocol value
  *
  * This macro is used to create a struct usb_device_id that matches a
  * specific device with a specific class of interfaces.
  *
  * This is especially useful when explicitly matching devices that have
  * vendor specific bDeviceClass values, but standards-compliant interfaces.
  */
 #define USB_DEVICE_AND_INTERFACE_INFO(vend, prod, cl, sc, pr) \
     .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \
         | USB_DEVICE_ID_MATCH_DEVICE, \
     .idVendor = (vend), \
     .idProduct = (prod), \
     .bInterfaceClass = (cl), \
     .bInterfaceSubClass = (sc), \
     .bInterfaceProtocol = (pr)
 
 /**
  * USB_VENDOR_AND_INTERFACE_INFO - describe a specific usb vendor with a class of usb interfaces
  * @vend: the 16 bit USB Vendor ID
  * @cl: bInterfaceClass value
  * @sc: bInterfaceSubClass value
  * @pr: bInterfaceProtocol value
  *
  * This macro is used to create a struct usb_device_id that matches a
  * specific vendor with a specific class of interfaces.
  *
  * This is especially useful when explicitly matching devices that have
  * vendor specific bDeviceClass values, but standards-compliant interfaces.
  */
 #define USB_VENDOR_AND_INTERFACE_INFO(vend, cl, sc, pr) \
     .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \
         | USB_DEVICE_ID_MATCH_VENDOR, \
     .idVendor = (vend), \
     .bInterfaceClass = (cl), \
     .bInterfaceSubClass = (sc), \
     .bInterfaceProtocol = (pr)
 
 /* ----------------------------------------------------------------------- */
 
 /* Stuff for dynamic usb ids */
 struct usb_dynids {
     spinlock_t lock;
     struct list_head list;
 };
 
 struct usb_dynid {
     struct list_head node;
     struct usb_device_id id;
 };
 
 extern ssize_t usb_store_new_id(struct usb_dynids *dynids,
                 const struct usb_device_id *id_table,
                 struct device_driver *driver,
                 const char *buf, size_t count);
 
 extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf);
 
 /**
  * struct usbdrv_wrap - wrapper for driver-model structure
  * @driver: The driver-model core driver structure.
  * @for_devices: Non-zero for device drivers, 0 for interface drivers.
  */
 struct usbdrv_wrap {
     struct device_driver driver;
     int for_devices;
 };
 
 /**
  * struct usb_driver - identifies USB interface driver to usbcore
  * @name: The driver name should be unique among USB drivers,
  *  and should normally be the same as the module name.
  * @probe: Called to see if the driver is willing to manage a particular
  *  interface on a device.  If it is, probe returns zero and uses
  *  usb_set_intfdata() to associate driver-specific data with the
  *  interface.  It may also use usb_set_interface() to specify the
  *  appropriate altsetting.  If unwilling to manage the interface,
  *  return -ENODEV, if genuine IO errors occurred, an appropriate
  *  negative errno value.
  * @disconnect: Called when the interface is no longer accessible, usually
  *  because its device has been (or is being) disconnected or the
  *  driver module is being unloaded.
  * @unlocked_ioctl: Used for drivers that want to talk to userspace through
  *  the "usbfs" filesystem.  This lets devices provide ways to
  *  expose information to user space regardless of where they
  *  do (or don't) show up otherwise in the filesystem.
  * @suspend: Called when the device is going to be suspended by the
  *  system either from system sleep or runtime suspend context. The
  *  return value will be ignored in system sleep context, so do NOT
  *  try to continue using the device if suspend fails in this case.
  *  Instead, let the resume or reset-resume routine recover from
  *  the failure.
  * @resume: Called when the device is being resumed by the system.
  * @reset_resume: Called when the suspended device has been reset instead
  *  of being resumed.
  * @pre_reset: Called by usb_reset_device() when the device is about to be
  *  reset.  This routine must not return until the driver has no active
  *  URBs for the device, and no more URBs may be submitted until the
  *  post_reset method is called.
  * @post_reset: Called by usb_reset_device() after the device
  *  has been reset
  * @id_table: USB drivers use ID table to support hotplugging.
  *  Export this with MODULE_DEVICE_TABLE(usb,...).  This must be set
  *  or your driver's probe function will never get called.
  * @dev_groups: Attributes attached to the device that will be created once it
  *  is bound to the driver.
  * @dynids: used internally to hold the list of dynamically added device
  *  ids for this driver.
  * @drvwrap: Driver-model core structure wrapper.
  * @no_dynamic_id: if set to 1, the USB core will not allow dynamic ids to be
  *  added to this driver by preventing the sysfs file from being created.
  * @supports_autosuspend: if set to 0, the USB core will not allow autosuspend
  *  for interfaces bound to this driver.
  * @soft_unbind: if set to 1, the USB core will not kill URBs and disable
  *  endpoints before calling the driver's disconnect method.
  * @disable_hub_initiated_lpm: if set to 1, the USB core will not allow hubs
  *  to initiate lower power link state transitions when an idle timeout
  *  occurs.  Device-initiated USB 3.0 link PM will still be allowed.
  *
  * USB interface drivers must provide a name, probe() and disconnect()
  * methods, and an id_table.  Other driver fields are optional.
  *
  * The id_table is used in hotplugging.  It holds a set of descriptors,
  * and specialized data may be associated with each entry.  That table
  * is used by both user and kernel mode hotplugging support.
  *
  * The probe() and disconnect() methods are called in a context where
  * they can sleep, but they should avoid abusing the privilege.  Most
  * work to connect to a device should be done when the device is opened,
  * and undone at the last close.  The disconnect code needs to address
  * concurrency issues with respect to open() and close() methods, as
  * well as forcing all pending I/O requests to complete (by unlinking
  * them as necessary, and blocking until the unlinks complete).
  */
 struct usb_driver {
     const char *name;
 
     int (*probe) (struct usb_interface *intf,
               const struct usb_device_id *id);
 
     void (*disconnect) (struct usb_interface *intf);
 
     int (*unlocked_ioctl) (struct usb_interface *intf, unsigned int code,
             void *buf);
 
     int (*suspend) (struct usb_interface *intf, pm_message_t message);
     int (*resume) (struct usb_interface *intf);
     int (*reset_resume)(struct usb_interface *intf);
 
     int (*pre_reset)(struct usb_interface *intf);
     int (*post_reset)(struct usb_interface *intf);
 
     const struct usb_device_id *id_table;
     const struct attribute_group **dev_groups;
 
     struct usb_dynids dynids;
     struct usbdrv_wrap drvwrap;
     unsigned int no_dynamic_id:1;
     unsigned int supports_autosuspend:1;
     unsigned int disable_hub_initiated_lpm:1;
     unsigned int soft_unbind:1;
 };
 #define to_usb_driver(d) container_of(d, struct usb_driver, drvwrap.driver)
 
 /**
  * struct usb_device_driver - identifies USB device driver to usbcore
  * @name: The driver name should be unique among USB drivers,
  *  and should normally be the same as the module name.
  * @match: If set, used for better device/driver matching.
  * @probe: Called to see if the driver is willing to manage a particular
  *  device.  If it is, probe returns zero and uses dev_set_drvdata()
  *  to associate driver-specific data with the device.  If unwilling
  *  to manage the device, return a negative errno value.
  * @disconnect: Called when the device is no longer accessible, usually
  *  because it has been (or is being) disconnected or the driver's
  *  module is being unloaded.
  * @suspend: Called when the device is going to be suspended by the system.
  * @resume: Called when the device is being resumed by the system.
  * @dev_groups: Attributes attached to the device that will be created once it
  *  is bound to the driver.
  * @drvwrap: Driver-model core structure wrapper.
  * @id_table: used with @match() to select better matching driver at
  *  probe() time.
  * @supports_autosuspend: if set to 0, the USB core will not allow autosuspend
  *  for devices bound to this driver.
  * @generic_subclass: if set to 1, the generic USB driver's probe, disconnect,
  *  resume and suspend functions will be called in addition to the driver's
  *  own, so this part of the setup does not need to be replicated.
  *
  * USB drivers must provide all the fields listed above except drvwrap,
  * match, and id_table.
  */
 struct usb_device_driver {
     const char *name;
 
     bool (*match) (struct usb_device *udev);
     int (*probe) (struct usb_device *udev);
     void (*disconnect) (struct usb_device *udev);
 
     int (*suspend) (struct usb_device *udev, pm_message_t message);
     int (*resume) (struct usb_device *udev, pm_message_t message);
     const struct attribute_group **dev_groups;
     struct usbdrv_wrap drvwrap;
     const struct usb_device_id *id_table;
     unsigned int supports_autosuspend:1;
     unsigned int generic_subclass:1;
 };
 #define to_usb_device_driver(d) container_of(d, struct usb_device_driver, \
         drvwrap.driver)
 
 /**
  * struct usb_class_driver - identifies a USB driver that wants to use the USB major number
  * @name: the usb class device name for this driver.  Will show up in sysfs.
  * @devnode: Callback to provide a naming hint for a possible
  *  device node to create.
  * @fops: pointer to the struct file_operations of this driver.
  * @minor_base: the start of the minor range for this driver.
  *
  * This structure is used for the usb_register_dev() and
  * usb_deregister_dev() functions, to consolidate a number of the
  * parameters used for them.
  */
 struct usb_class_driver {
     char *name;
     char *(*devnode)(struct device *dev, umode_t *mode);
     const struct file_operations *fops;
     int minor_base;
 };
 
 /*
  * use these in module_init()/module_exit()
  * and don't forget MODULE_DEVICE_TABLE(usb, ...)
  */
 extern int usb_register_driver(struct usb_driver *, struct module *,
                    const char *);
 
 /* use a define to avoid include chaining to get THIS_MODULE & friends */
 #define usb_register(driver) \
     usb_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
 
 extern void usb_deregister(struct usb_driver *);
 
 /**
  * module_usb_driver() - Helper macro for registering a USB driver
  * @__usb_driver: usb_driver struct
  *
  * Helper macro for USB drivers which do not do anything special in module
  * init/exit. This eliminates a lot of boilerplate. Each module may only
  * use this macro once, and calling it replaces module_init() and module_exit()
  */
 #define module_usb_driver(__usb_driver) \
     module_driver(__usb_driver, usb_register, \
                usb_deregister)
 
 extern int usb_register_device_driver(struct usb_device_driver *,
             struct module *);
 extern void usb_deregister_device_driver(struct usb_device_driver *);
 
 extern int usb_register_dev(struct usb_interface *intf,
                 struct usb_class_driver *class_driver);
 extern void usb_deregister_dev(struct usb_interface *intf,
                    struct usb_class_driver *class_driver);
 
 extern int usb_disabled(void);
 
 /* ----------------------------------------------------------------------- */
 
 /*
  * URB support, for asynchronous request completions
  */
 
 /*
  * urb->transfer_flags:
  *
  * Note: URB_DIR_IN/OUT is automatically set in usb_submit_urb().
  */
 #define URB_SHORT_NOT_OK    0x0001  /* report short reads as errors */
 #define URB_ISO_ASAP        0x0002  /* iso-only; use the first unexpired
                      * slot in the schedule */
 #define URB_NO_TRANSFER_DMA_MAP 0x0004  /* urb->transfer_dma valid on submit */
 #define URB_ZERO_PACKET     0x0040  /* Finish bulk OUT with short packet */
 #define URB_NO_INTERRUPT    0x0080  /* HINT: no non-error interrupt
                      * needed */
 #define URB_FREE_BUFFER     0x0100  /* Free transfer buffer with the URB */
 
 /* The following flags are used internally by usbcore and HCDs */
 #define URB_DIR_IN      0x0200  /* Transfer from device to host */
 #define URB_DIR_OUT     0
 #define URB_DIR_MASK        URB_DIR_IN
 
 #define URB_DMA_MAP_SINGLE  0x00010000  /* Non-scatter-gather mapping */
 #define URB_DMA_MAP_PAGE    0x00020000  /* HCD-unsupported S-G */
 #define URB_DMA_MAP_SG      0x00040000  /* HCD-supported S-G */
 #define URB_MAP_LOCAL       0x00080000  /* HCD-local-memory mapping */
 #define URB_SETUP_MAP_SINGLE    0x00100000  /* Setup packet DMA mapped */
 #define URB_SETUP_MAP_LOCAL 0x00200000  /* HCD-local setup packet */
 #define URB_DMA_SG_COMBINED 0x00400000  /* S-G entries were combined */
 #define URB_ALIGNED_TEMP_BUFFER 0x00800000  /* Temp buffer was alloc'd */
 
 struct usb_iso_packet_descriptor {
     unsigned int offset;
     unsigned int length;        /* expected length */
     unsigned int actual_length;
     int status;
 };
 
 struct urb;
 
 struct usb_anchor {
     struct list_head urb_list;
     wait_queue_head_t wait;
     spinlock_t lock;
     atomic_t suspend_wakeups;
     unsigned int poisoned:1;
 };
 
 static inline void init_usb_anchor(struct usb_anchor *anchor)
 {
     memset(anchor, 0, sizeof(*anchor));
     INIT_LIST_HEAD(&anchor->urb_list);
     init_waitqueue_head(&anchor->wait);
     spin_lock_init(&anchor->lock);
 }
 
 typedef void (*usb_complete_t)(struct urb *);
 
 /**
  * struct urb - USB Request Block
  * @urb_list: For use by current owner of the URB.
  * @anchor_list: membership in the list of an anchor
  * @anchor: to anchor URBs to a common mooring
  * @ep: Points to the endpoint's data structure.  Will eventually
  *  replace @pipe.
  * @pipe: Holds endpoint number, direction, type, and more.
  *  Create these values with the eight macros available;
  *  usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl"
  *  (control), "bulk", "int" (interrupt), or "iso" (isochronous).
  *  For example usb_sndbulkpipe() or usb_rcvintpipe().  Endpoint
  *  numbers range from zero to fifteen.  Note that "in" endpoint two
  *  is a different endpoint (and pipe) from "out" endpoint two.
  *  The current configuration controls the existence, type, and
  *  maximum packet size of any given endpoint.
  * @stream_id: the endpoint's stream ID for bulk streams
  * @dev: Identifies the USB device to perform the request.
  * @status: This is read in non-iso completion functions to get the
  *  status of the particular request.  ISO requests only use it
  *  to tell whether the URB was unlinked; detailed status for
  *  each frame is in the fields of the iso_frame-desc.
  * @transfer_flags: A variety of flags may be used to affect how URB
  *  submission, unlinking, or operation are handled.  Different
  *  kinds of URB can use different flags.
  * @transfer_buffer:  This identifies the buffer to (or from) which the I/O
  *  request will be performed unless URB_NO_TRANSFER_DMA_MAP is set
  *  (however, do not leave garbage in transfer_buffer even then).
  *  This buffer must be suitable for DMA; allocate it with
  *  kmalloc() or equivalent.  For transfers to "in" endpoints, contents
  *  of this buffer will be modified.  This buffer is used for the data
  *  stage of control transfers.
  * @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP,
  *  the device driver is saying that it provided this DMA address,
  *  which the host controller driver should use in preference to the
  *  transfer_buffer.
  * @sg: scatter gather buffer list, the buffer size of each element in
  *  the list (except the last) must be divisible by the endpoint's
  *  max packet size if no_sg_constraint isn't set in 'struct usb_bus'
  * @num_mapped_sgs: (internal) number of mapped sg entries
  * @num_sgs: number of entries in the sg list
  * @transfer_buffer_length: How big is transfer_buffer.  The transfer may
  *  be broken up into chunks according to the current maximum packet
  *  size for the endpoint, which is a function of the configuration
  *  and is encoded in the pipe.  When the length is zero, neither
  *  transfer_buffer nor transfer_dma is used.
  * @actual_length: This is read in non-iso completion functions, and
  *  it tells how many bytes (out of transfer_buffer_length) were
  *  transferred.  It will normally be the same as requested, unless
  *  either an error was reported or a short read was performed.
  *  The URB_SHORT_NOT_OK transfer flag may be used to make such
  *  short reads be reported as errors.
  * @setup_packet: Only used for control transfers, this points to eight bytes
  *  of setup data.  Control transfers always start by sending this data
  *  to the device.  Then transfer_buffer is read or written, if needed.
  * @setup_dma: DMA pointer for the setup packet.  The caller must not use
  *  this field; setup_packet must point to a valid buffer.
  * @start_frame: Returns the initial frame for isochronous transfers.
  * @number_of_packets: Lists the number of ISO transfer buffers.
  * @interval: Specifies the polling interval for interrupt or isochronous
  *  transfers.  The units are frames (milliseconds) for full and low
  *  speed devices, and microframes (1/8 millisecond) for highspeed
  *  and SuperSpeed devices.
  * @error_count: Returns the number of ISO transfers that reported errors.
  * @context: For use in completion functions.  This normally points to
  *  request-specific driver context.
  * @complete: Completion handler. This URB is passed as the parameter to the
  *  completion function.  The completion function may then do what
  *  it likes with the URB, including resubmitting or freeing it.
  * @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to
  *  collect the transfer status for each buffer.
  *
  * This structure identifies USB transfer requests.  URBs must be allocated by
  * calling usb_alloc_urb() and freed with a call to usb_free_urb().
  * Initialization may be done using various usb_fill_*_urb() functions.  URBs
  * are submitted using usb_submit_urb(), and pending requests may be canceled
  * using usb_unlink_urb() or usb_kill_urb().
  *
  * Data Transfer Buffers:
  *
  * Normally drivers provide I/O buffers allocated with kmalloc() or otherwise
  * taken from the general page pool.  That is provided by transfer_buffer
  * (control requests also use setup_packet), and host controller drivers
  * perform a dma mapping (and unmapping) for each buffer transferred.  Those
  * mapping operations can be expensive on some platforms (perhaps using a dma
  * bounce buffer or talking to an IOMMU),
  * although they're cheap on commodity x86 and ppc hardware.
  *
  * Alternatively, drivers may pass the URB_NO_TRANSFER_DMA_MAP transfer flag,
  * which tells the host controller driver that no such mapping is needed for
  * the transfer_buffer since
  * the device driver is DMA-aware.  For example, a device driver might
  * allocate a DMA buffer with usb_alloc_coherent() or call usb_buffer_map().
  * When this transfer flag is provided, host controller drivers will
  * attempt to use the dma address found in the transfer_dma
  * field rather than determining a dma address themselves.
  *
  * Note that transfer_buffer must still be set if the controller
  * does not support DMA (as indicated by hcd_uses_dma()) and when talking
  * to root hub. If you have to transfer between highmem zone and the device
  * on such controller, create a bounce buffer or bail out with an error.
  * If transfer_buffer cannot be set (is in highmem) and the controller is DMA
  * capable, assign NULL to it, so that usbmon knows not to use the value.
  * The setup_packet must always be set, so it cannot be located in highmem.
  *
  * Initialization:
  *
  * All URBs submitted must initialize the dev, pipe, transfer_flags (may be
  * zero), and complete fields.  All URBs must also initialize
  * transfer_buffer and transfer_buffer_length.  They may provide the
  * URB_SHORT_NOT_OK transfer flag, indicating that short reads are
  * to be treated as errors; that flag is invalid for write requests.
  *
  * Bulk URBs may
  * use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers
  * should always terminate with a short packet, even if it means adding an
  * extra zero length packet.
  *
  * Control URBs must provide a valid pointer in the setup_packet field.
  * Unlike the transfer_buffer, the setup_packet may not be mapped for DMA
  * beforehand.
  *
  * Interrupt URBs must provide an interval, saying how often (in milliseconds
  * or, for highspeed devices, 125 microsecond units)
  * to poll for transfers.  After the URB has been submitted, the interval
  * field reflects how the transfer was actually scheduled.
  * The polling interval may be more frequent than requested.
  * For example, some controllers have a maximum interval of 32 milliseconds,
  * while others support intervals of up to 1024 milliseconds.
  * Isochronous URBs also have transfer intervals.  (Note that for isochronous
  * endpoints, as well as high speed interrupt endpoints, the encoding of
  * the transfer interval in the endpoint descriptor is logarithmic.
  * Device drivers must convert that value to linear units themselves.)
  *
  * If an isochronous endpoint queue isn't already running, the host
  * controller will schedule a new URB to start as soon as bandwidth
  * utilization allows.  If the queue is running then a new URB will be
  * scheduled to start in the first transfer slot following the end of the
  * preceding URB, if that slot has not already expired.  If the slot has
  * expired (which can happen when IRQ delivery is delayed for a long time),
  * the scheduling behavior depends on the URB_ISO_ASAP flag.  If the flag
  * is clear then the URB will be scheduled to start in the expired slot,
  * implying that some of its packets will not be transferred; if the flag
  * is set then the URB will be scheduled in the first unexpired slot,
  * breaking the queue's synchronization.  Upon URB completion, the
  * start_frame field will be set to the (micro)frame number in which the
  * transfer was scheduled.  Ranges for frame counter values are HC-specific
  * and can go from as low as 256 to as high as 65536 frames.
  *
  * Isochronous URBs have a different data transfer model, in part because
  * the quality of service is only "best effort".  Callers provide specially
  * allocated URBs, with number_of_packets worth of iso_frame_desc structures
  * at the end.  Each such packet is an individual ISO transfer.  Isochronous
  * URBs are normally queued, submitted by drivers to arrange that
  * transfers are at least double buffered, and then explicitly resubmitted
  * in completion handlers, so
  * that data (such as audio or video) streams at as constant a rate as the
  * host controller scheduler can support.
  *
  * Completion Callbacks:
  *
  * The completion callback is made in_interrupt(), and one of the first
  * things that a completion handler should do is check the status field.
  * The status field is provided for all URBs.  It is used to report
  * unlinked URBs, and status for all non-ISO transfers.  It should not
  * be examined before the URB is returned to the completion handler.
  *
  * The context field is normally used to link URBs back to the relevant
  * driver or request state.
  *
  * When the completion callback is invoked for non-isochronous URBs, the
  * actual_length field tells how many bytes were transferred.  This field
  * is updated even when the URB terminated with an error or was unlinked.
  *
  * ISO transfer status is reported in the status and actual_length fields
  * of the iso_frame_desc array, and the number of errors is reported in
  * error_count.  Completion callbacks for ISO transfers will normally
  * (re)submit URBs to ensure a constant transfer rate.
  *
  * Note that even fields marked "public" should not be touched by the driver
  * when the urb is owned by the hcd, that is, since the call to
  * usb_submit_urb() till the entry into the completion routine.
  */
 struct urb {
     /* private: usb core and host controller only fields in the urb */
     struct kref kref;       /* reference count of the URB */
     int unlinked;           /* unlink error code */
     void *hcpriv;           /* private data for host controller */
     atomic_t use_count;     /* concurrent submissions counter */
     atomic_t reject;        /* submissions will fail */
 
     /* public: documented fields in the urb that can be used by drivers */
     struct list_head urb_list;  /* list head for use by the urb's
                      * current owner */
     struct list_head anchor_list;   /* the URB may be anchored */
     struct usb_anchor *anchor;
     struct usb_device *dev;     /* (in) pointer to associated device */
     struct usb_host_endpoint *ep;   /* (internal) pointer to endpoint */
     unsigned int pipe;      /* (in) pipe information */
     unsigned int stream_id;     /* (in) stream ID */
     int status;         /* (return) non-ISO status */
     unsigned int transfer_flags;    /* (in) URB_SHORT_NOT_OK | ...*/
     void *transfer_buffer;      /* (in) associated data buffer */
     dma_addr_t transfer_dma;    /* (in) dma addr for transfer_buffer */
     struct scatterlist *sg;     /* (in) scatter gather buffer list */
     int num_mapped_sgs;     /* (internal) mapped sg entries */
     int num_sgs;            /* (in) number of entries in the sg list */
     u32 transfer_buffer_length; /* (in) data buffer length */
     u32 actual_length;      /* (return) actual transfer length */
     unsigned char *setup_packet;    /* (in) setup packet (control only) */
     dma_addr_t setup_dma;       /* (in) dma addr for setup_packet */
     int start_frame;        /* (modify) start frame (ISO) */
     int number_of_packets;      /* (in) number of ISO packets */
     int interval;           /* (modify) transfer interval
                      * (INT/ISO) */
     int error_count;        /* (return) number of ISO errors */
     void *context;          /* (in) context for completion */
     usb_complete_t complete;    /* (in) completion routine */
     struct usb_iso_packet_descriptor iso_frame_desc[];
                     /* (in) ISO ONLY */
 };
 
 /* ----------------------------------------------------------------------- */
 
 /**
  * usb_fill_control_urb - initializes a control urb
  * @urb: pointer to the urb to initialize.
  * @dev: pointer to the struct usb_device for this urb.
  * @pipe: the endpoint pipe
  * @setup_packet: pointer to the setup_packet buffer
  * @transfer_buffer: pointer to the transfer buffer
  * @buffer_length: length of the transfer buffer
  * @complete_fn: pointer to the usb_complete_t function
  * @context: what to set the urb context to.
  *
  * Initializes a control urb with the proper information needed to submit
  * it to a device.
  */
 static inline void usb_fill_control_urb(struct urb *urb,
                     struct usb_device *dev,
                     unsigned int pipe,
                     unsigned char *setup_packet,
                     void *transfer_buffer,
                     int buffer_length,
                     usb_complete_t complete_fn,
                     void *context)
 {
     urb->dev = dev;
     urb->pipe = pipe;
     urb->setup_packet = setup_packet;
     urb->transfer_buffer = transfer_buffer;
     urb->transfer_buffer_length = buffer_length;
     urb->complete = complete_fn;
     urb->context = context;
 }
 
 /**
  * usb_fill_bulk_urb - macro to help initialize a bulk urb
  * @urb: pointer to the urb to initialize.
  * @dev: pointer to the struct usb_device for this urb.
  * @pipe: the endpoint pipe
  * @transfer_buffer: pointer to the transfer buffer
  * @buffer_length: length of the transfer buffer
  * @complete_fn: pointer to the usb_complete_t function
  * @context: what to set the urb context to.
  *
  * Initializes a bulk urb with the proper information needed to submit it
  * to a device.
  */
 static inline void usb_fill_bulk_urb(struct urb *urb,
                      struct usb_device *dev,
                      unsigned int pipe,
                      void *transfer_buffer,
                      int buffer_length,
                      usb_complete_t complete_fn,
                      void *context)
 {
     urb->dev = dev;
     urb->pipe = pipe;
     urb->transfer_buffer = transfer_buffer;
     urb->transfer_buffer_length = buffer_length;
     urb->complete = complete_fn;
     urb->context = context;
 }
 
 /**
  * usb_fill_int_urb - macro to help initialize a interrupt urb
  * @urb: pointer to the urb to initialize.
  * @dev: pointer to the struct usb_device for this urb.
  * @pipe: the endpoint pipe
  * @transfer_buffer: pointer to the transfer buffer
  * @buffer_length: length of the transfer buffer
  * @complete_fn: pointer to the usb_complete_t function
  * @context: what to set the urb context to.
  * @interval: what to set the urb interval to, encoded like
  *  the endpoint descriptor's bInterval value.
  *
  * Initializes a interrupt urb with the proper information needed to submit
  * it to a device.
  *
  * Note that High Speed and SuperSpeed(+) interrupt endpoints use a logarithmic
  * encoding of the endpoint interval, and express polling intervals in
  * microframes (eight per millisecond) rather than in frames (one per
  * millisecond).
  *
  * Wireless USB also uses the logarithmic encoding, but specifies it in units of
  * 128us instead of 125us.  For Wireless USB devices, the interval is passed
  * through to the host controller, rather than being translated into microframe
  * units.
  */
 static inline void usb_fill_int_urb(struct urb *urb,
                     struct usb_device *dev,
                     unsigned int pipe,
                     void *transfer_buffer,
                     int buffer_length,
                     usb_complete_t complete_fn,
                     void *context,
                     int interval)
 {
     urb->dev = dev;
     urb->pipe = pipe;
     urb->transfer_buffer = transfer_buffer;
     urb->transfer_buffer_length = buffer_length;
     urb->complete = complete_fn;
     urb->context = context;
 
     if (dev->speed == USB_SPEED_HIGH || dev->speed >= USB_SPEED_SUPER) {
         /* make sure interval is within allowed range */
         interval = clamp(interval, 1, 16);
 
         urb->interval = 1 << (interval - 1);
     } else {
         urb->interval = interval;
     }
 
     urb->start_frame = -1;
 }
 
 extern void usb_init_urb(struct urb *urb);
 extern struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags);
 extern void usb_free_urb(struct urb *urb);
 #define usb_put_urb usb_free_urb
 extern struct urb *usb_get_urb(struct urb *urb);
 extern int usb_submit_urb(struct urb *urb, gfp_t mem_flags);
 extern int usb_unlink_urb(struct urb *urb);
 extern void usb_kill_urb(struct urb *urb);
 extern void usb_poison_urb(struct urb *urb);
 extern void usb_unpoison_urb(struct urb *urb);
 extern void usb_block_urb(struct urb *urb);
 extern void usb_kill_anchored_urbs(struct usb_anchor *anchor);
 extern void usb_poison_anchored_urbs(struct usb_anchor *anchor);
 extern void usb_unpoison_anchored_urbs(struct usb_anchor *anchor);
 extern void usb_unlink_anchored_urbs(struct usb_anchor *anchor);
 extern void usb_anchor_suspend_wakeups(struct usb_anchor *anchor);
 extern void usb_anchor_resume_wakeups(struct usb_anchor *anchor);
 extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor);
 extern void usb_unanchor_urb(struct urb *urb);
 extern int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor,
                      unsigned int timeout);
 extern struct urb *usb_get_from_anchor(struct usb_anchor *anchor);
 extern void usb_scuttle_anchored_urbs(struct usb_anchor *anchor);
 extern int usb_anchor_empty(struct usb_anchor *anchor);
 
 #define usb_unblock_urb usb_unpoison_urb
 
 /**
  * usb_urb_dir_in - check if an URB describes an IN transfer
  * @urb: URB to be checked
  *
  * Return: 1 if @urb describes an IN transfer (device-to-host),
  * otherwise 0.
  */
 static inline int usb_urb_dir_in(struct urb *urb)
 {
     return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN;
 }
 
 /**
  * usb_urb_dir_out - check if an URB describes an OUT transfer
  * @urb: URB to be checked
  *
  * Return: 1 if @urb describes an OUT transfer (host-to-device),
  * otherwise 0.
  */
 static inline int usb_urb_dir_out(struct urb *urb)
 {
     return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_OUT;
 }
 
 int usb_pipe_type_check(struct usb_device *dev, unsigned int pipe);
 int usb_urb_ep_type_check(const struct urb *urb);
 
 void *usb_alloc_coherent(struct usb_device *dev, size_t size,
     gfp_t mem_flags, dma_addr_t *dma);
 void usb_free_coherent(struct usb_device *dev, size_t size,
     void *addr, dma_addr_t dma);
 
 #if 0
 struct urb *usb_buffer_map(struct urb *urb);
 void usb_buffer_dmasync(struct urb *urb);
 void usb_buffer_unmap(struct urb *urb);
 #endif
 
 struct scatterlist;
 int usb_buffer_map_sg(const struct usb_device *dev, int is_in,
               struct scatterlist *sg, int nents);
 #if 0
 void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in,
                struct scatterlist *sg, int n_hw_ents);
 #endif
 void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in,
              struct scatterlist *sg, int n_hw_ents);
 
 /*-------------------------------------------------------------------*
  *                         SYNCHRONOUS CALL SUPPORT                  *
  *-------------------------------------------------------------------*/
 
 extern int usb_control_msg(struct usb_device *dev, unsigned int pipe,
     __u8 request, __u8 requesttype, __u16 value, __u16 index,
     void *data, __u16 size, int timeout);
 extern int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe,
     void *data, int len, int *actual_length, int timeout);
 extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe,
     void *data, int len, int *actual_length,
     int timeout);
 
 /* wrappers around usb_control_msg() for the most common standard requests */
 int usb_control_msg_send(struct usb_device *dev, __u8 endpoint, __u8 request,
              __u8 requesttype, __u16 value, __u16 index,
              const void *data, __u16 size, int timeout,
              gfp_t memflags);
 int usb_control_msg_recv(struct usb_device *dev, __u8 endpoint, __u8 request,
              __u8 requesttype, __u16 value, __u16 index,
              void *data, __u16 size, int timeout,
              gfp_t memflags);
 extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype,
     unsigned char descindex, void *buf, int size);
 extern int usb_get_status(struct usb_device *dev,
     int recip, int type, int target, void *data);
 
 static inline int usb_get_std_status(struct usb_device *dev,
     int recip, int target, void *data)
 {
     return usb_get_status(dev, recip, USB_STATUS_TYPE_STANDARD, target,
         data);
 }
 
 static inline int usb_get_ptm_status(struct usb_device *dev, void *data)
 {
     return usb_get_status(dev, USB_RECIP_DEVICE, USB_STATUS_TYPE_PTM,
         0, data);
 }
 
 extern int usb_string(struct usb_device *dev, int index,
     char *buf, size_t size);
 
 /* wrappers that also update important state inside usbcore */
 extern int usb_clear_halt(struct usb_device *dev, int pipe);
 extern int usb_reset_configuration(struct usb_device *dev);
 extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate);
 extern void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr);
 
 /* this request isn't really synchronous, but it belongs with the others */
 extern int usb_driver_set_configuration(struct usb_device *udev, int config);
 
 /* choose and set configuration for device */
 extern int usb_choose_configuration(struct usb_device *udev);
 extern int usb_set_configuration(struct usb_device *dev, int configuration);
 
 /*
  * timeouts, in milliseconds, used for sending/receiving control messages
  * they typically complete within a few frames (msec) after they're issued
  * USB identifies 5 second timeouts, maybe more in a few cases, and a few
  * slow devices (like some MGE Ellipse UPSes) actually push that limit.
  */
 #define USB_CTRL_GET_TIMEOUT    5000
 #define USB_CTRL_SET_TIMEOUT    5000
 
 
 /**
  * struct usb_sg_request - support for scatter/gather I/O
  * @status: zero indicates success, else negative errno
  * @bytes: counts bytes transferred.
  *
  * These requests are initialized using usb_sg_init(), and then are used
  * as request handles passed to usb_sg_wait() or usb_sg_cancel().  Most
  * members of the request object aren't for driver access.
  *
  * The status and bytecount values are valid only after usb_sg_wait()
  * returns.  If the status is zero, then the bytecount matches the total
  * from the request.
  *
  * After an error completion, drivers may need to clear a halt condition
  * on the endpoint.
  */
 struct usb_sg_request {
     int         status;
     size_t          bytes;
 
     /* private:
      * members below are private to usbcore,
      * and are not provided for driver access!
      */
     spinlock_t      lock;
 
     struct usb_device   *dev;
     int         pipe;
 
     int         entries;
     struct urb      **urbs;
 
     int         count;
     struct completion   complete;
 };
 
 int usb_sg_init(
     struct usb_sg_request   *io,
     struct usb_device   *dev,
     unsigned        pipe,
     unsigned        period,
     struct scatterlist  *sg,
     int         nents,
     size_t          length,
     gfp_t           mem_flags
 );
 void usb_sg_cancel(struct usb_sg_request *io);
 void usb_sg_wait(struct usb_sg_request *io);
 
 
 /* ----------------------------------------------------------------------- */
 
 /*
  * For various legacy reasons, Linux has a small cookie that's paired with
  * a struct usb_device to identify an endpoint queue.  Queue characteristics
  * are defined by the endpoint's descriptor.  This cookie is called a "pipe",
  * an unsigned int encoded as:
  *
  *  - direction:    bit 7       (0 = Host-to-Device [Out],
  *                   1 = Device-to-Host [In] ...
  *                  like endpoint bEndpointAddress)
  *  - device address:   bits 8-14       ... bit positions known to uhci-hcd
  *  - endpoint:     bits 15-18      ... bit positions known to uhci-hcd
  *  - pipe type:    bits 30-31  (00 = isochronous, 01 = interrupt,
  *                   10 = control, 11 = bulk)
  *
  * Given the device address and endpoint descriptor, pipes are redundant.
  */
 
 /* NOTE:  these are not the standard USB_ENDPOINT_XFER_* values!! */
 /* (yet ... they're the values used by usbfs) */
 #define PIPE_ISOCHRONOUS        0
 #define PIPE_INTERRUPT          1
 #define PIPE_CONTROL            2
 #define PIPE_BULK           3
 
 #define usb_pipein(pipe)    ((pipe) & USB_DIR_IN)
 #define usb_pipeout(pipe)   (!usb_pipein(pipe))
 
 #define usb_pipedevice(pipe)    (((pipe) >> 8) & 0x7f)
 #define usb_pipeendpoint(pipe)  (((pipe) >> 15) & 0xf)
 
 #define usb_pipetype(pipe)  (((pipe) >> 30) & 3)
 #define usb_pipeisoc(pipe)  (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
 #define usb_pipeint(pipe)   (usb_pipetype((pipe)) == PIPE_INTERRUPT)
 #define usb_pipecontrol(pipe)   (usb_pipetype((pipe)) == PIPE_CONTROL)
 #define usb_pipebulk(pipe)  (usb_pipetype((pipe)) == PIPE_BULK)
 
 static inline unsigned int __create_pipe(struct usb_device *dev,
         unsigned int endpoint)
 {
     return (dev->devnum << 8) | (endpoint << 15);
 }
 
 /* Create various pipes... */
 #define usb_sndctrlpipe(dev, endpoint)  \
     ((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint))
 #define usb_rcvctrlpipe(dev, endpoint)  \
     ((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
 #define usb_sndisocpipe(dev, endpoint)  \
     ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint))
 #define usb_rcvisocpipe(dev, endpoint)  \
     ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
 #define usb_sndbulkpipe(dev, endpoint)  \
     ((PIPE_BULK << 30) | __create_pipe(dev, endpoint))
 #define usb_rcvbulkpipe(dev, endpoint)  \
     ((PIPE_BULK << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
 #define usb_sndintpipe(dev, endpoint)   \
     ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint))
 #define usb_rcvintpipe(dev, endpoint)   \
     ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
 
 static inline struct usb_host_endpoint *
 usb_pipe_endpoint(struct usb_device *dev, unsigned int pipe)
 {
     struct usb_host_endpoint **eps;
     eps = usb_pipein(pipe) ? dev->ep_in : dev->ep_out;
     return eps[usb_pipeendpoint(pipe)];
 }
 
 static inline u16 usb_maxpacket(struct usb_device *udev, int pipe)
 {
     struct usb_host_endpoint *ep = usb_pipe_endpoint(udev, pipe);
 
     if (!ep)
         return 0;
 
     /* NOTE:  only 0x07ff bits are for packet size... */
     return usb_endpoint_maxp(&ep->desc);
 }
 
 /* translate USB error codes to codes user space understands */
 static inline int usb_translate_errors(int error_code)
 {
     switch (error_code) {
     case 0:
     case -ENOMEM:
     case -ENODEV:
     case -EOPNOTSUPP:
         return error_code;
     default:
         return -EIO;
     }
 }
 
 /* Events from the usb core */
 #define USB_DEVICE_ADD      0x0001
 #define USB_DEVICE_REMOVE   0x0002
 #define USB_BUS_ADD     0x0003
 #define USB_BUS_REMOVE      0x0004
 extern void usb_register_notify(struct notifier_block *nb);
 extern void usb_unregister_notify(struct notifier_block *nb);
 
 /* debugfs stuff */
 extern struct dentry *usb_debug_root;
 
 /* LED triggers */
 enum usb_led_event {
     USB_LED_EVENT_HOST = 0,
     USB_LED_EVENT_GADGET = 1,
 };
 
 #ifdef CONFIG_USB_LED_TRIG
 extern void usb_led_activity(enum usb_led_event ev);
 #else
 static inline void usb_led_activity(enum usb_led_event ev) {}
 #endif
 
 #endif  /* __KERNEL__ */
 
 #endif

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