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 // SPDX-License-Identifier: GPL-2.0+
 /*
  * composite.h -- framework for usb gadgets which are composite devices
  *
  * Copyright (C) 2006-2008 David Brownell
  */
 
 #ifndef __LINUX_USB_COMPOSITE_H
 #define __LINUX_USB_COMPOSITE_H
 
 /*
  * This framework is an optional layer on top of the USB Gadget interface,
  * making it easier to build (a) Composite devices, supporting multiple
  * functions within any single configuration, and (b) Multi-configuration
  * devices, also supporting multiple functions but without necessarily
  * having more than one function per configuration.
  *
  * Example:  a device with a single configuration supporting both network
  * link and mass storage functions is a composite device.  Those functions
  * might alternatively be packaged in individual configurations, but in
  * the composite model the host can use both functions at the same time.
  */
 
 #include <linux/bcd.h>
 #include <linux/version.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/log2.h>
 #include <linux/configfs.h>
 
 /*
  * USB function drivers should return USB_GADGET_DELAYED_STATUS if they
  * wish to delay the data/status stages of the control transfer till they
  * are ready. The control transfer will then be kept from completing till
  * all the function drivers that requested for USB_GADGET_DELAYED_STAUS
  * invoke usb_composite_setup_continue().
  */
 #define USB_GADGET_DELAYED_STATUS       0x7fff  /* Impossibly large value */
 
 /* big enough to hold our biggest descriptor */
 #define USB_COMP_EP0_BUFSIZ 4096
 
 /* OS feature descriptor length <= 4kB */
 #define USB_COMP_EP0_OS_DESC_BUFSIZ 4096
 
 #define USB_MS_TO_HS_INTERVAL(x)    (ilog2((x * 1000 / 125)) + 1)
 struct usb_configuration;
 
 /**
  * struct usb_os_desc_ext_prop - describes one "Extended Property"
  * @entry: used to keep a list of extended properties
  * @type: Extended Property type
  * @name_len: Extended Property unicode name length, including terminating '\0'
  * @name: Extended Property name
  * @data_len: Length of Extended Property blob (for unicode store double len)
  * @data: Extended Property blob
  * @item: Represents this Extended Property in configfs
  */
 struct usb_os_desc_ext_prop {
     struct list_head    entry;
     u8          type;
     int         name_len;
     char            *name;
     int         data_len;
     char            *data;
     struct config_item  item;
 };
 
 /**
  * struct usb_os_desc - describes OS descriptors associated with one interface
  * @ext_compat_id: 16 bytes of "Compatible ID" and "Subcompatible ID"
  * @ext_prop: Extended Properties list
  * @ext_prop_len: Total length of Extended Properties blobs
  * @ext_prop_count: Number of Extended Properties
  * @opts_mutex: Optional mutex protecting config data of a usb_function_instance
  * @group: Represents OS descriptors associated with an interface in configfs
  * @owner: Module associated with this OS descriptor
  */
 struct usb_os_desc {
     char            *ext_compat_id;
     struct list_head    ext_prop;
     int         ext_prop_len;
     int         ext_prop_count;
     struct mutex        *opts_mutex;
     struct config_group group;
     struct module       *owner;
 };
 
 /**
  * struct usb_os_desc_table - describes OS descriptors associated with one
  * interface of a usb_function
  * @if_id: Interface id
  * @os_desc: "Extended Compatibility ID" and "Extended Properties" of the
  *  interface
  *
  * Each interface can have at most one "Extended Compatibility ID" and a
  * number of "Extended Properties".
  */
 struct usb_os_desc_table {
     int         if_id;
     struct usb_os_desc  *os_desc;
 };
 
 /**
  * struct usb_function - describes one function of a configuration
  * @name: For diagnostics, identifies the function.
  * @strings: tables of strings, keyed by identifiers assigned during bind()
  *  and by language IDs provided in control requests
  * @fs_descriptors: Table of full (or low) speed descriptors, using interface and
  *  string identifiers assigned during @bind().  If this pointer is null,
  *  the function will not be available at full speed (or at low speed).
  * @hs_descriptors: Table of high speed descriptors, using interface and
  *  string identifiers assigned during @bind().  If this pointer is null,
  *  the function will not be available at high speed.
  * @ss_descriptors: Table of super speed descriptors, using interface and
  *  string identifiers assigned during @bind(). If this
  *  pointer is null after initiation, the function will not
  *  be available at super speed.
  * @ssp_descriptors: Table of super speed plus descriptors, using
  *  interface and string identifiers assigned during @bind(). If
  *  this pointer is null after initiation, the function will not
  *  be available at super speed plus.
  * @config: assigned when @usb_add_function() is called; this is the
  *  configuration with which this function is associated.
  * @os_desc_table: Table of (interface id, os descriptors) pairs. The function
  *  can expose more than one interface. If an interface is a member of
  *  an IAD, only the first interface of IAD has its entry in the table.
  * @os_desc_n: Number of entries in os_desc_table
  * @bind: Before the gadget can register, all of its functions bind() to the
  *  available resources including string and interface identifiers used
  *  in interface or class descriptors; endpoints; I/O buffers; and so on.
  * @unbind: Reverses @bind; called as a side effect of unregistering the
  *  driver which added this function.
  * @free_func: free the struct usb_function.
  * @mod: (internal) points to the module that created this structure.
  * @set_alt: (REQUIRED) Reconfigures altsettings; function drivers may
  *  initialize usb_ep.driver data at this time (when it is used).
  *  Note that setting an interface to its current altsetting resets
  *  interface state, and that all interfaces have a disabled state.
  * @get_alt: Returns the active altsetting.  If this is not provided,
  *  then only altsetting zero is supported.
  * @disable: (REQUIRED) Indicates the function should be disabled.  Reasons
  *  include host resetting or reconfiguring the gadget, and disconnection.
  * @setup: Used for interface-specific control requests.
  * @req_match: Tests if a given class request can be handled by this function.
  * @suspend: Notifies functions when the host stops sending USB traffic.
  * @resume: Notifies functions when the host restarts USB traffic.
  * @get_status: Returns function status as a reply to
  *  GetStatus() request when the recipient is Interface.
  * @func_suspend: callback to be called when
  *  SetFeature(FUNCTION_SUSPEND) is reseived
  *
  * A single USB function uses one or more interfaces, and should in most
  * cases support operation at both full and high speeds.  Each function is
  * associated by @usb_add_function() with a one configuration; that function
  * causes @bind() to be called so resources can be allocated as part of
  * setting up a gadget driver.  Those resources include endpoints, which
  * should be allocated using @usb_ep_autoconfig().
  *
  * To support dual speed operation, a function driver provides descriptors
  * for both high and full speed operation.  Except in rare cases that don't
  * involve bulk endpoints, each speed needs different endpoint descriptors.
  *
  * Function drivers choose their own strategies for managing instance data.
  * The simplest strategy just declares it "static', which means the function
  * can only be activated once.  If the function needs to be exposed in more
  * than one configuration at a given speed, it needs to support multiple
  * usb_function structures (one for each configuration).
  *
  * A more complex strategy might encapsulate a @usb_function structure inside
  * a driver-specific instance structure to allows multiple activations.  An
  * example of multiple activations might be a CDC ACM function that supports
  * two or more distinct instances within the same configuration, providing
  * several independent logical data links to a USB host.
  */
 
 struct usb_function {
     const char          *name;
     struct usb_gadget_strings   **strings;
     struct usb_descriptor_header    **fs_descriptors;
     struct usb_descriptor_header    **hs_descriptors;
     struct usb_descriptor_header    **ss_descriptors;
     struct usb_descriptor_header    **ssp_descriptors;
 
     struct usb_configuration    *config;
 
     struct usb_os_desc_table    *os_desc_table;
     unsigned            os_desc_n;
 
     /* REVISIT:  bind() functions can be marked __init, which
      * makes trouble for section mismatch analysis.  See if
      * we can't restructure things to avoid mismatching.
      * Related:  unbind() may kfree() but bind() won't...
      */
 
     /* configuration management:  bind/unbind */
     int         (*bind)(struct usb_configuration *,
                     struct usb_function *);
     void            (*unbind)(struct usb_configuration *,
                     struct usb_function *);
     void            (*free_func)(struct usb_function *f);
     struct module       *mod;
 
     /* runtime state management */
     int         (*set_alt)(struct usb_function *,
                     unsigned interface, unsigned alt);
     int         (*get_alt)(struct usb_function *,
                     unsigned interface);
     void            (*disable)(struct usb_function *);
     int         (*setup)(struct usb_function *,
                     const struct usb_ctrlrequest *);
     bool            (*req_match)(struct usb_function *,
                     const struct usb_ctrlrequest *,
                     bool config0);
     void            (*suspend)(struct usb_function *);
     void            (*resume)(struct usb_function *);
 
     /* USB 3.0 additions */
     int         (*get_status)(struct usb_function *);
     int         (*func_suspend)(struct usb_function *,
                         u8 suspend_opt);
     /* private: */
     /* internals */
     struct list_head        list;
     DECLARE_BITMAP(endpoints, 32);
     const struct usb_function_instance *fi;
 
     unsigned int        bind_deactivated:1;
 };
 
 int usb_add_function(struct usb_configuration *, struct usb_function *);
 
 int usb_function_deactivate(struct usb_function *);
 int usb_function_activate(struct usb_function *);
 
 int usb_interface_id(struct usb_configuration *, struct usb_function *);
 
 int config_ep_by_speed_and_alt(struct usb_gadget *g, struct usb_function *f,
                 struct usb_ep *_ep, u8 alt);
 
 int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f,
             struct usb_ep *_ep);
 
 #define MAX_CONFIG_INTERFACES       16  /* arbitrary; max 255 */
 
 /**
  * struct usb_configuration - represents one gadget configuration
  * @label: For diagnostics, describes the configuration.
  * @strings: Tables of strings, keyed by identifiers assigned during @bind()
  *  and by language IDs provided in control requests.
  * @descriptors: Table of descriptors preceding all function descriptors.
  *  Examples include OTG and vendor-specific descriptors.
  * @unbind: Reverses @bind; called as a side effect of unregistering the
  *  driver which added this configuration.
  * @setup: Used to delegate control requests that aren't handled by standard
  *  device infrastructure or directed at a specific interface.
  * @bConfigurationValue: Copied into configuration descriptor.
  * @iConfiguration: Copied into configuration descriptor.
  * @bmAttributes: Copied into configuration descriptor.
  * @MaxPower: Power consumption in mA. Used to compute bMaxPower in the
  *  configuration descriptor after considering the bus speed.
  * @cdev: assigned by @usb_add_config() before calling @bind(); this is
  *  the device associated with this configuration.
  *
  * Configurations are building blocks for gadget drivers structured around
  * function drivers.  Simple USB gadgets require only one function and one
  * configuration, and handle dual-speed hardware by always providing the same
  * functionality.  Slightly more complex gadgets may have more than one
  * single-function configuration at a given speed; or have configurations
  * that only work at one speed.
  *
  * Composite devices are, by definition, ones with configurations which
  * include more than one function.
  *
  * The lifecycle of a usb_configuration includes allocation, initialization
  * of the fields described above, and calling @usb_add_config() to set up
  * internal data and bind it to a specific device.  The configuration's
  * @bind() method is then used to initialize all the functions and then
  * call @usb_add_function() for them.
  *
  * Those functions would normally be independent of each other, but that's
  * not mandatory.  CDC WMC devices are an example where functions often
  * depend on other functions, with some functions subsidiary to others.
  * Such interdependency may be managed in any way, so long as all of the
  * descriptors complete by the time the composite driver returns from
  * its bind() routine.
  */
 struct usb_configuration {
     const char          *label;
     struct usb_gadget_strings   **strings;
     const struct usb_descriptor_header **descriptors;
 
     /* REVISIT:  bind() functions can be marked __init, which
      * makes trouble for section mismatch analysis.  See if
      * we can't restructure things to avoid mismatching...
      */
 
     /* configuration management: unbind/setup */
     void            (*unbind)(struct usb_configuration *);
     int         (*setup)(struct usb_configuration *,
                     const struct usb_ctrlrequest *);
 
     /* fields in the config descriptor */
     u8          bConfigurationValue;
     u8          iConfiguration;
     u8          bmAttributes;
     u16         MaxPower;
 
     struct usb_composite_dev    *cdev;
 
     /* private: */
     /* internals */
     struct list_head    list;
     struct list_head    functions;
     u8          next_interface_id;
     unsigned        superspeed:1;
     unsigned        highspeed:1;
     unsigned        fullspeed:1;
     unsigned        superspeed_plus:1;
     struct usb_function *interface[MAX_CONFIG_INTERFACES];
 };
 
 int usb_add_config(struct usb_composite_dev *,
         struct usb_configuration *,
         int (*)(struct usb_configuration *));
 
 void usb_remove_config(struct usb_composite_dev *,
         struct usb_configuration *);
 
 /* predefined index for usb_composite_driver */
 enum {
     USB_GADGET_MANUFACTURER_IDX = 0,
     USB_GADGET_PRODUCT_IDX,
     USB_GADGET_SERIAL_IDX,
     USB_GADGET_FIRST_AVAIL_IDX,
 };
 
 /**
  * struct usb_composite_driver - groups configurations into a gadget
  * @name: For diagnostics, identifies the driver.
  * @dev: Template descriptor for the device, including default device
  *  identifiers.
  * @strings: tables of strings, keyed by identifiers assigned during @bind
  *  and language IDs provided in control requests. Note: The first entries
  *  are predefined. The first entry that may be used is
  *  USB_GADGET_FIRST_AVAIL_IDX
  * @max_speed: Highest speed the driver supports.
  * @needs_serial: set to 1 if the gadget needs userspace to provide
  *  a serial number.  If one is not provided, warning will be printed.
  * @bind: (REQUIRED) Used to allocate resources that are shared across the
  *  whole device, such as string IDs, and add its configurations using
  *  @usb_add_config(). This may fail by returning a negative errno
  *  value; it should return zero on successful initialization.
  * @unbind: Reverses @bind; called as a side effect of unregistering
  *  this driver.
  * @disconnect: optional driver disconnect method
  * @suspend: Notifies when the host stops sending USB traffic,
  *  after function notifications
  * @resume: Notifies configuration when the host restarts USB traffic,
  *  before function notifications
  * @gadget_driver: Gadget driver controlling this driver
  *
  * Devices default to reporting self powered operation.  Devices which rely
  * on bus powered operation should report this in their @bind method.
  *
  * Before returning from @bind, various fields in the template descriptor
  * may be overridden.  These include the idVendor/idProduct/bcdDevice values
  * normally to bind the appropriate host side driver, and the three strings
  * (iManufacturer, iProduct, iSerialNumber) normally used to provide user
  * meaningful device identifiers.  (The strings will not be defined unless
  * they are defined in @dev and @strings.)  The correct ep0 maxpacket size
  * is also reported, as defined by the underlying controller driver.
  */
 struct usb_composite_driver {
     const char              *name;
     const struct usb_device_descriptor  *dev;
     struct usb_gadget_strings       **strings;
     enum usb_device_speed           max_speed;
     unsigned        needs_serial:1;
 
     int         (*bind)(struct usb_composite_dev *cdev);
     int         (*unbind)(struct usb_composite_dev *);
 
     void            (*disconnect)(struct usb_composite_dev *);
 
     /* global suspend hooks */
     void            (*suspend)(struct usb_composite_dev *);
     void            (*resume)(struct usb_composite_dev *);
     struct usb_gadget_driver        gadget_driver;
 };
 
 extern int usb_composite_probe(struct usb_composite_driver *driver);
 extern void usb_composite_unregister(struct usb_composite_driver *driver);
 
 /**
  * module_usb_composite_driver() - Helper macro for registering a USB gadget
  * composite driver
  * @__usb_composite_driver: usb_composite_driver struct
  *
  * Helper macro for USB gadget composite 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_composite_driver(__usb_composite_driver) \
     module_driver(__usb_composite_driver, usb_composite_probe, \
                usb_composite_unregister)
 
 extern void usb_composite_setup_continue(struct usb_composite_dev *cdev);
 extern int composite_dev_prepare(struct usb_composite_driver *composite,
         struct usb_composite_dev *cdev);
 extern int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
                      struct usb_ep *ep0);
 void composite_dev_cleanup(struct usb_composite_dev *cdev);
 
 static inline struct usb_composite_driver *to_cdriver(
         struct usb_gadget_driver *gdrv)
 {
     return container_of(gdrv, struct usb_composite_driver, gadget_driver);
 }
 
 #define OS_STRING_QW_SIGN_LEN       14
 #define OS_STRING_IDX           0xEE
 
 /**
  * struct usb_composite_dev - represents one composite usb gadget
  * @gadget: read-only, abstracts the gadget's usb peripheral controller
  * @req: used for control responses; buffer is pre-allocated
  * @os_desc_req: used for OS descriptors responses; buffer is pre-allocated
  * @config: the currently active configuration
  * @qw_sign: qwSignature part of the OS string
  * @b_vendor_code: bMS_VendorCode part of the OS string
  * @use_os_string: false by default, interested gadgets set it
  * @os_desc_config: the configuration to be used with OS descriptors
  * @setup_pending: true when setup request is queued but not completed
  * @os_desc_pending: true when os_desc request is queued but not completed
  *
  * One of these devices is allocated and initialized before the
  * associated device driver's bind() is called.
  *
  * OPEN ISSUE:  it appears that some WUSB devices will need to be
  * built by combining a normal (wired) gadget with a wireless one.
  * This revision of the gadget framework should probably try to make
  * sure doing that won't hurt too much.
  *
  * One notion for how to handle Wireless USB devices involves:
  *
  * (a) a second gadget here, discovery mechanism TBD, but likely
  *     needing separate "register/unregister WUSB gadget" calls;
  * (b) updates to usb_gadget to include flags "is it wireless",
  *     "is it wired", plus (presumably in a wrapper structure)
  *     bandgroup and PHY info;
  * (c) presumably a wireless_ep wrapping a usb_ep, and reporting
  *     wireless-specific parameters like maxburst and maxsequence;
  * (d) configurations that are specific to wireless links;
  * (e) function drivers that understand wireless configs and will
  *     support wireless for (additional) function instances;
  * (f) a function to support association setup (like CBAF), not
  *     necessarily requiring a wireless adapter;
  * (g) composite device setup that can create one or more wireless
  *     configs, including appropriate association setup support;
  * (h) more, TBD.
  */
 struct usb_composite_dev {
     struct usb_gadget       *gadget;
     struct usb_request      *req;
     struct usb_request      *os_desc_req;
 
     struct usb_configuration    *config;
 
     /* OS String is a custom (yet popular) extension to the USB standard. */
     u8              qw_sign[OS_STRING_QW_SIGN_LEN];
     u8              b_vendor_code;
     struct usb_configuration    *os_desc_config;
     unsigned int            use_os_string:1;
 
     /* private: */
     /* internals */
     unsigned int            suspended:1;
     struct usb_device_descriptor    desc;
     struct list_head        configs;
     struct list_head        gstrings;
     struct usb_composite_driver *driver;
     u8              next_string_id;
     char                *def_manufacturer;
 
     /* the gadget driver won't enable the data pullup
      * while the deactivation count is nonzero.
      */
     unsigned            deactivations;
 
     /* the composite driver won't complete the control transfer's
      * data/status stages till delayed_status is zero.
      */
     int             delayed_status;
 
     /* protects deactivations and delayed_status counts*/
     spinlock_t          lock;
 
     /* public: */
     unsigned int            setup_pending:1;
     unsigned int            os_desc_pending:1;
 };
 
 extern int usb_string_id(struct usb_composite_dev *c);
 extern int usb_string_ids_tab(struct usb_composite_dev *c,
                   struct usb_string *str);
 extern struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
         struct usb_gadget_strings **sp, unsigned n_strings);
 
 extern int usb_string_ids_n(struct usb_composite_dev *c, unsigned n);
 
 extern void composite_disconnect(struct usb_gadget *gadget);
 extern void composite_reset(struct usb_gadget *gadget);
 
 extern int composite_setup(struct usb_gadget *gadget,
         const struct usb_ctrlrequest *ctrl);
 extern void composite_suspend(struct usb_gadget *gadget);
 extern void composite_resume(struct usb_gadget *gadget);
 
 /*
  * Some systems will need runtime overrides for the  product identifiers
  * published in the device descriptor, either numbers or strings or both.
  * String parameters are in UTF-8 (superset of ASCII's 7 bit characters).
  */
 struct usb_composite_overwrite {
     u16 idVendor;
     u16 idProduct;
     u16 bcdDevice;
     char    *serial_number;
     char    *manufacturer;
     char    *product;
 };
 #define USB_GADGET_COMPOSITE_OPTIONS()                  \
     static struct usb_composite_overwrite coverwrite;       \
                                     \
     module_param_named(idVendor, coverwrite.idVendor, ushort, S_IRUGO); \
     MODULE_PARM_DESC(idVendor, "USB Vendor ID");            \
                                     \
     module_param_named(idProduct, coverwrite.idProduct, ushort, S_IRUGO); \
     MODULE_PARM_DESC(idProduct, "USB Product ID");          \
                                     \
     module_param_named(bcdDevice, coverwrite.bcdDevice, ushort, S_IRUGO); \
     MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");    \
                                     \
     module_param_named(iSerialNumber, coverwrite.serial_number, charp, \
             S_IRUGO); \
     MODULE_PARM_DESC(iSerialNumber, "SerialNumber string");     \
                                     \
     module_param_named(iManufacturer, coverwrite.manufacturer, charp, \
             S_IRUGO); \
     MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); \
                                     \
     module_param_named(iProduct, coverwrite.product, charp, S_IRUGO); \
     MODULE_PARM_DESC(iProduct, "USB Product string")
 
 void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
         struct usb_composite_overwrite *covr);
 
 static inline u16 get_default_bcdDevice(void)
 {
     u16 bcdDevice;
 
     bcdDevice = bin2bcd(LINUX_VERSION_MAJOR) << 8;
     bcdDevice |= bin2bcd(LINUX_VERSION_PATCHLEVEL);
     return bcdDevice;
 }
 
 struct usb_function_driver {
     const char *name;
     struct module *mod;
     struct list_head list;
     struct usb_function_instance *(*alloc_inst)(void);
     struct usb_function *(*alloc_func)(struct usb_function_instance *inst);
 };
 
 struct usb_function_instance {
     struct config_group group;
     struct list_head cfs_list;
     struct usb_function_driver *fd;
     int (*set_inst_name)(struct usb_function_instance *inst,
                   const char *name);
     void (*free_func_inst)(struct usb_function_instance *inst);
 };
 
 void usb_function_unregister(struct usb_function_driver *f);
 int usb_function_register(struct usb_function_driver *newf);
 void usb_put_function_instance(struct usb_function_instance *fi);
 void usb_put_function(struct usb_function *f);
 struct usb_function_instance *usb_get_function_instance(const char *name);
 struct usb_function *usb_get_function(struct usb_function_instance *fi);
 
 struct usb_configuration *usb_get_config(struct usb_composite_dev *cdev,
         int val);
 int usb_add_config_only(struct usb_composite_dev *cdev,
         struct usb_configuration *config);
 void usb_remove_function(struct usb_configuration *c, struct usb_function *f);
 
 #define DECLARE_USB_FUNCTION(_name, _inst_alloc, _func_alloc)       \
     static struct usb_function_driver _name ## usb_func = {     \
         .name = __stringify(_name),             \
         .mod  = THIS_MODULE,                    \
         .alloc_inst = _inst_alloc,              \
         .alloc_func = _func_alloc,              \
     };                              \
     MODULE_ALIAS("usbfunc:"__stringify(_name));
 
 #define DECLARE_USB_FUNCTION_INIT(_name, _inst_alloc, _func_alloc)  \
     DECLARE_USB_FUNCTION(_name, _inst_alloc, _func_alloc)       \
     static int __init _name ## mod_init(void)           \
     {                               \
         return usb_function_register(&_name ## usb_func);   \
     }                               \
     static void __exit _name ## mod_exit(void)          \
     {                               \
         usb_function_unregister(&_name ## usb_func);        \
     }                               \
     module_init(_name ## mod_init);                 \
     module_exit(_name ## mod_exit)
 
 /* messaging utils */
 #define DBG(d, fmt, args...) \
     dev_dbg(&(d)->gadget->dev , fmt , ## args)
 #define VDBG(d, fmt, args...) \
     dev_vdbg(&(d)->gadget->dev , fmt , ## args)
 #define ERROR(d, fmt, args...) \
     dev_err(&(d)->gadget->dev , fmt , ## args)
 #define WARNING(d, fmt, args...) \
     dev_warn(&(d)->gadget->dev , fmt , ## args)
 #define INFO(d, fmt, args...) \
     dev_info(&(d)->gadget->dev , fmt , ## args)
 
 #endif  /* __LINUX_USB_COMPOSITE_H */

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