include/linux/usb/composite.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * composite.h -- framework for usb gadgets which are composite devices
   4  *
   5  * Copyright (C) 2006-2008 David Brownell
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22 #ifndef __LINUX_USB_COMPOSITE_H
  23 #define __LINUX_USB_COMPOSITE_H
  24
  25 /*
  26  * This framework is an optional layer on top of the USB Gadget interface,
  27  * making it easier to build (a) Composite devices, supporting multiple
  28  * functions within any single configuration, and (b) Multi-configuration
  29  * devices, also supporting multiple functions but without necessarily
  30  * having more than one function per configuration.
  31  *
  32  * Example:  a device with a single configuration supporting both network
  33  * link and mass storage functions is a composite device.  Those functions
  34  * might alternatively be packaged in individual configurations, but in
  35  * the composite model the host can use both functions at the same time.
  36  */
  37
  38 #include <linux/bcd.h>
  39 #include <linux/version.h>
  40 #include <linux/usb/ch9.h>
  41 #include <linux/usb/gadget.h>
  42 #include <linux/log2.h>
  43 #include <linux/configfs.h>
  44
  45 /*
  46  * USB function drivers should return USB_GADGET_DELAYED_STATUS if they
  47  * wish to delay the data/status stages of the control transfer till they
  48  * are ready. The control transfer will then be kept from completing till
  49  * all the function drivers that requested for USB_GADGET_DELAYED_STAUS
  50  * invoke usb_composite_setup_continue().
  51  */
  52 #define USB_GADGET_DELAYED_STATUS       0x7fff  /* Impossibly large value */
  53
  54 /* big enough to hold our biggest descriptor */
  55 #define USB_COMP_EP0_BUFSIZ     4096
  56
  57 /* OS feature descriptor length <= 4kB */
  58 #define USB_COMP_EP0_OS_DESC_BUFSIZ     4096
  59
  60 #define USB_MS_TO_HS_INTERVAL(x)        (ilog2((x * 1000 / 125)) + 1)
  61 struct usb_configuration;
  62
  63 /**
  64  * struct usb_os_desc_ext_prop - describes one "Extended Property"
  65  * @entry: used to keep a list of extended properties
  66  * @type: Extended Property type
  67  * @name_len: Extended Property unicode name length, including terminating '\0'
  68  * @name: Extended Property name
  69  * @data_len: Length of Extended Property blob (for unicode store double len)
  70  * @data: Extended Property blob
  71  * @item: Represents this Extended Property in configfs
  72  */
  73 struct usb_os_desc_ext_prop {
  74         struct list_head        entry;
  75         u8                      type;
  76         int                     name_len;
  77         char                    *name;
  78         int                     data_len;
  79         char                    *data;
  80         struct config_item      item;
  81 };
  82
  83 /**
  84  * struct usb_os_desc - describes OS descriptors associated with one interface
  85  * @ext_compat_id: 16 bytes of "Compatible ID" and "Subcompatible ID"
  86  * @ext_prop: Extended Properties list
  87  * @ext_prop_len: Total length of Extended Properties blobs
  88  * @ext_prop_count: Number of Extended Properties
  89  * @opts_mutex: Optional mutex protecting config data of a usb_function_instance
  90  * @group: Represents OS descriptors associated with an interface in configfs
  91  * @owner: Module associated with this OS descriptor
  92  */
  93 struct usb_os_desc {
  94         char                    *ext_compat_id;
  95         struct list_head        ext_prop;
  96         int                     ext_prop_len;
  97         int                     ext_prop_count;
  98         struct mutex            *opts_mutex;
  99         struct config_group     group;
 100         struct module           *owner;
 101 };
 102
 103 /**
 104  * struct usb_os_desc_table - describes OS descriptors associated with one
 105  * interface of a usb_function
 106  * @if_id: Interface id
 107  * @os_desc: "Extended Compatibility ID" and "Extended Properties" of the
 108  *      interface
 109  *
 110  * Each interface can have at most one "Extended Compatibility ID" and a
 111  * number of "Extended Properties".
 112  */
 113 struct usb_os_desc_table {
 114         int                     if_id;
 115         struct usb_os_desc      *os_desc;
 116 };
 117
 118 /**
 119  * struct usb_function - describes one function of a configuration
 120  * @name: For diagnostics, identifies the function.
 121  * @strings: tables of strings, keyed by identifiers assigned during bind()
 122  *      and by language IDs provided in control requests
 123  * @fs_descriptors: Table of full (or low) speed descriptors, using interface and
 124  *      string identifiers assigned during @bind().  If this pointer is null,
 125  *      the function will not be available at full speed (or at low speed).
 126  * @hs_descriptors: Table of high speed descriptors, using interface and
 127  *      string identifiers assigned during @bind().  If this pointer is null,
 128  *      the function will not be available at high speed.
 129  * @ss_descriptors: Table of super speed descriptors, using interface and
 130  *      string identifiers assigned during @bind(). If this
 131  *      pointer is null after initiation, the function will not
 132  *      be available at super speed.
 133  * @ssp_descriptors: Table of super speed plus descriptors, using
 134  *      interface and string identifiers assigned during @bind(). If
 135  *      this pointer is null after initiation, the function will not
 136  *      be available at super speed plus.
 137  * @config: assigned when @usb_add_function() is called; this is the
 138  *      configuration with which this function is associated.
 139  * @os_desc_table: Table of (interface id, os descriptors) pairs. The function
 140  *      can expose more than one interface. If an interface is a member of
 141  *      an IAD, only the first interface of IAD has its entry in the table.
 142  * @os_desc_n: Number of entries in os_desc_table
 143  * @bind: Before the gadget can register, all of its functions bind() to the
 144  *      available resources including string and interface identifiers used
 145  *      in interface or class descriptors; endpoints; I/O buffers; and so on.
 146  * @unbind: Reverses @bind; called as a side effect of unregistering the
 147  *      driver which added this function.
 148  * @free_func: free the struct usb_function.
 149  * @mod: (internal) points to the module that created this structure.
 150  * @set_alt: (REQUIRED) Reconfigures altsettings; function drivers may
 151  *      initialize usb_ep.driver data at this time (when it is used).
 152  *      Note that setting an interface to its current altsetting resets
 153  *      interface state, and that all interfaces have a disabled state.
 154  * @get_alt: Returns the active altsetting.  If this is not provided,
 155  *      then only altsetting zero is supported.
 156  * @disable: (REQUIRED) Indicates the function should be disabled.  Reasons
 157  *      include host resetting or reconfiguring the gadget, and disconnection.
 158  * @setup: Used for interface-specific control requests.
 159  * @req_match: Tests if a given class request can be handled by this function.
 160  * @suspend: Notifies functions when the host stops sending USB traffic.
 161  * @resume: Notifies functions when the host restarts USB traffic.
 162  * @get_status: Returns function status as a reply to
 163  *      GetStatus() request when the recipient is Interface.
 164  * @func_suspend: callback to be called when
 165  *      SetFeature(FUNCTION_SUSPEND) is reseived
 166  *
 167  * A single USB function uses one or more interfaces, and should in most
 168  * cases support operation at both full and high speeds.  Each function is
 169  * associated by @usb_add_function() with a one configuration; that function
 170  * causes @bind() to be called so resources can be allocated as part of
 171  * setting up a gadget driver.  Those resources include endpoints, which
 172  * should be allocated using @usb_ep_autoconfig().
 173  *
 174  * To support dual speed operation, a function driver provides descriptors
 175  * for both high and full speed operation.  Except in rare cases that don't
 176  * involve bulk endpoints, each speed needs different endpoint descriptors.
 177  *
 178  * Function drivers choose their own strategies for managing instance data.
 179  * The simplest strategy just declares it "static', which means the function
 180  * can only be activated once.  If the function needs to be exposed in more
 181  * than one configuration at a given speed, it needs to support multiple
 182  * usb_function structures (one for each configuration).
 183  *
 184  * A more complex strategy might encapsulate a @usb_function structure inside
 185  * a driver-specific instance structure to allows multiple activations.  An
 186  * example of multiple activations might be a CDC ACM function that supports
 187  * two or more distinct instances within the same configuration, providing
 188  * several independent logical data links to a USB host.
 189  */
 190
 191 struct usb_function {
 192         const char                      *name;
 193         struct usb_gadget_strings       **strings;
 194         struct usb_descriptor_header    **fs_descriptors;
 195         struct usb_descriptor_header    **hs_descriptors;
 196         struct usb_descriptor_header    **ss_descriptors;
 197         struct usb_descriptor_header    **ssp_descriptors;
 198
 199         struct usb_configuration        *config;
 200
 201         struct usb_os_desc_table        *os_desc_table;
 202         unsigned                        os_desc_n;
 203
 204         /* REVISIT:  bind() functions can be marked __init, which
 205          * makes trouble for section mismatch analysis.  See if
 206          * we can't restructure things to avoid mismatching.
 207          * Related:  unbind() may kfree() but bind() won't...
 208          */
 209
 210         /* configuration management:  bind/unbind */
 211         int                     (*bind)(struct usb_configuration *,
 212                                         struct usb_function *);
 213         void                    (*unbind)(struct usb_configuration *,
 214                                         struct usb_function *);
 215         void                    (*free_func)(struct usb_function *f);
 216         struct module           *mod;
 217
 218         /* runtime state management */
 219         int                     (*set_alt)(struct usb_function *,
 220                                         unsigned interface, unsigned alt);
 221         int                     (*get_alt)(struct usb_function *,
 222                                         unsigned interface);
 223         void                    (*disable)(struct usb_function *);
 224         int                     (*setup)(struct usb_function *,
 225                                         const struct usb_ctrlrequest *);
 226         bool                    (*req_match)(struct usb_function *,
 227                                         const struct usb_ctrlrequest *,
 228                                         bool config0);
 229         void                    (*suspend)(struct usb_function *);
 230         void                    (*resume)(struct usb_function *);
 231
 232         /* USB 3.0 additions */
 233         int                     (*get_status)(struct usb_function *);
 234         int                     (*func_suspend)(struct usb_function *,
 235                                                 u8 suspend_opt);
 236         /* private: */
 237         /* internals */
 238         struct list_head                list;
 239         DECLARE_BITMAP(endpoints, 32);
 240         const struct usb_function_instance *fi;
 241
 242         unsigned int            bind_deactivated:1;
 243 };
 244
 245 int usb_add_function(struct usb_configuration *, struct usb_function *);
 246
 247 int usb_function_deactivate(struct usb_function *);
 248 int usb_function_activate(struct usb_function *);
 249
 250 int usb_interface_id(struct usb_configuration *, struct usb_function *);
 251
 252 int config_ep_by_speed_and_alt(struct usb_gadget *g, struct usb_function *f,
 253                                 struct usb_ep *_ep, u8 alt);
 254
 255 int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f,
 256                         struct usb_ep *_ep);
 257
 258 #define MAX_CONFIG_INTERFACES           16      /* arbitrary; max 255 */
 259
 260 /**
 261  * struct usb_configuration - represents one gadget configuration
 262  * @label: For diagnostics, describes the configuration.
 263  * @strings: Tables of strings, keyed by identifiers assigned during @bind()
 264  *      and by language IDs provided in control requests.
 265  * @descriptors: Table of descriptors preceding all function descriptors.
 266  *      Examples include OTG and vendor-specific descriptors.
 267  * @unbind: Reverses @bind; called as a side effect of unregistering the
 268  *      driver which added this configuration.
 269  * @setup: Used to delegate control requests that aren't handled by standard
 270  *      device infrastructure or directed at a specific interface.
 271  * @bConfigurationValue: Copied into configuration descriptor.
 272  * @iConfiguration: Copied into configuration descriptor.
 273  * @bmAttributes: Copied into configuration descriptor.
 274  * @MaxPower: Power consumption in mA. Used to compute bMaxPower in the
 275  *      configuration descriptor after considering the bus speed.
 276  * @cdev: assigned by @usb_add_config() before calling @bind(); this is
 277  *      the device associated with this configuration.
 278  *
 279  * Configurations are building blocks for gadget drivers structured around
 280  * function drivers.  Simple USB gadgets require only one function and one
 281  * configuration, and handle dual-speed hardware by always providing the same
 282  * functionality.  Slightly more complex gadgets may have more than one
 283  * single-function configuration at a given speed; or have configurations
 284  * that only work at one speed.
 285  *
 286  * Composite devices are, by definition, ones with configurations which
 287  * include more than one function.
 288  *
 289  * The lifecycle of a usb_configuration includes allocation, initialization
 290  * of the fields described above, and calling @usb_add_config() to set up
 291  * internal data and bind it to a specific device.  The configuration's
 292  * @bind() method is then used to initialize all the functions and then
 293  * call @usb_add_function() for them.
 294  *
 295  * Those functions would normally be independent of each other, but that's
 296  * not mandatory.  CDC WMC devices are an example where functions often
 297  * depend on other functions, with some functions subsidiary to others.
 298  * Such interdependency may be managed in any way, so long as all of the
 299  * descriptors complete by the time the composite driver returns from
 300  * its bind() routine.
 301  */
 302 struct usb_configuration {
 303         const char                      *label;
 304         struct usb_gadget_strings       **strings;
 305         const struct usb_descriptor_header **descriptors;
 306
 307         /* REVISIT:  bind() functions can be marked __init, which
 308          * makes trouble for section mismatch analysis.  See if
 309          * we can't restructure things to avoid mismatching...
 310          */
 311
 312         /* configuration management: unbind/setup */
 313         void                    (*unbind)(struct usb_configuration *);
 314         int                     (*setup)(struct usb_configuration *,
 315                                         const struct usb_ctrlrequest *);
 316
 317         /* fields in the config descriptor */
 318         u8                      bConfigurationValue;
 319         u8                      iConfiguration;
 320         u8                      bmAttributes;
 321         u16                     MaxPower;
 322
 323         struct usb_composite_dev        *cdev;
 324
 325         /* private: */
 326         /* internals */
 327         struct list_head        list;
 328         struct list_head        functions;
 329         u8                      next_interface_id;
 330         unsigned                superspeed:1;
 331         unsigned                highspeed:1;
 332         unsigned                fullspeed:1;
 333         unsigned                superspeed_plus:1;
 334         struct usb_function     *interface[MAX_CONFIG_INTERFACES];
 335 };
 336
 337 int usb_add_config(struct usb_composite_dev *,
 338                 struct usb_configuration *,
 339                 int (*)(struct usb_configuration *));
 340
 341 void usb_remove_config(struct usb_composite_dev *,
 342                 struct usb_configuration *);
 343
 344 /* predefined index for usb_composite_driver */
 345 enum {
 346         USB_GADGET_MANUFACTURER_IDX     = 0,
 347         USB_GADGET_PRODUCT_IDX,
 348         USB_GADGET_SERIAL_IDX,
 349         USB_GADGET_FIRST_AVAIL_IDX,
 350 };
 351
 352 /**
 353  * struct usb_composite_driver - groups configurations into a gadget
 354  * @name: For diagnostics, identifies the driver.
 355  * @dev: Template descriptor for the device, including default device
 356  *      identifiers.
 357  * @strings: tables of strings, keyed by identifiers assigned during @bind
 358  *      and language IDs provided in control requests. Note: The first entries
 359  *      are predefined. The first entry that may be used is
 360  *      USB_GADGET_FIRST_AVAIL_IDX
 361  * @max_speed: Highest speed the driver supports.
 362  * @needs_serial: set to 1 if the gadget needs userspace to provide
 363  *      a serial number.  If one is not provided, warning will be printed.
 364  * @bind: (REQUIRED) Used to allocate resources that are shared across the
 365  *      whole device, such as string IDs, and add its configurations using
 366  *      @usb_add_config(). This may fail by returning a negative errno
 367  *      value; it should return zero on successful initialization.
 368  * @unbind: Reverses @bind; called as a side effect of unregistering
 369  *      this driver.
 370  * @disconnect: optional driver disconnect method
 371  * @suspend: Notifies when the host stops sending USB traffic,
 372  *      after function notifications
 373  * @resume: Notifies configuration when the host restarts USB traffic,
 374  *      before function notifications
 375  * @gadget_driver: Gadget driver controlling this driver
 376  *
 377  * Devices default to reporting self powered operation.  Devices which rely
 378  * on bus powered operation should report this in their @bind method.
 379  *
 380  * Before returning from @bind, various fields in the template descriptor
 381  * may be overridden.  These include the idVendor/idProduct/bcdDevice values
 382  * normally to bind the appropriate host side driver, and the three strings
 383  * (iManufacturer, iProduct, iSerialNumber) normally used to provide user
 384  * meaningful device identifiers.  (The strings will not be defined unless
 385  * they are defined in @dev and @strings.)  The correct ep0 maxpacket size
 386  * is also reported, as defined by the underlying controller driver.
 387  */
 388 struct usb_composite_driver {
 389         const char                              *name;
 390         const struct usb_device_descriptor      *dev;
 391         struct usb_gadget_strings               **strings;
 392         enum usb_device_speed                   max_speed;
 393         unsigned                needs_serial:1;
 394
 395         int                     (*bind)(struct usb_composite_dev *cdev);
 396         int                     (*unbind)(struct usb_composite_dev *);
 397
 398         void                    (*disconnect)(struct usb_composite_dev *);
 399
 400         /* global suspend hooks */
 401         void                    (*suspend)(struct usb_composite_dev *);
 402         void                    (*resume)(struct usb_composite_dev *);
 403         struct usb_gadget_driver                gadget_driver;
 404 };
 405
 406 extern int usb_composite_probe(struct usb_composite_driver *driver);
 407 extern void usb_composite_unregister(struct usb_composite_driver *driver);
 408
 409 /**
 410  * module_usb_composite_driver() - Helper macro for registering a USB gadget
 411  * composite driver
 412  * @__usb_composite_driver: usb_composite_driver struct
 413  *
 414  * Helper macro for USB gadget composite drivers which do not do anything
 415  * special in module init/exit. This eliminates a lot of boilerplate. Each
 416  * module may only use this macro once, and calling it replaces module_init()
 417  * and module_exit()
 418  */
 419 #define module_usb_composite_driver(__usb_composite_driver) \
 420         module_driver(__usb_composite_driver, usb_composite_probe, \
 421                        usb_composite_unregister)
 422
 423 extern void usb_composite_setup_continue(struct usb_composite_dev *cdev);
 424 extern int composite_dev_prepare(struct usb_composite_driver *composite,
 425                 struct usb_composite_dev *cdev);
 426 extern int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
 427                                          struct usb_ep *ep0);
 428 void composite_dev_cleanup(struct usb_composite_dev *cdev);
 429
 430 static inline struct usb_composite_driver *to_cdriver(
 431                 struct usb_gadget_driver *gdrv)
 432 {
 433         return container_of(gdrv, struct usb_composite_driver, gadget_driver);
 434 }
 435
 436 #define OS_STRING_QW_SIGN_LEN           14
 437 #define OS_STRING_IDX                   0xEE
 438
 439 /**
 440  * struct usb_composite_dev - represents one composite usb gadget
 441  * @gadget: read-only, abstracts the gadget's usb peripheral controller
 442  * @req: used for control responses; buffer is pre-allocated
 443  * @os_desc_req: used for OS descriptors responses; buffer is pre-allocated
 444  * @config: the currently active configuration
 445  * @qw_sign: qwSignature part of the OS string
 446  * @b_vendor_code: bMS_VendorCode part of the OS string
 447  * @use_os_string: false by default, interested gadgets set it
 448  * @os_desc_config: the configuration to be used with OS descriptors
 449  * @setup_pending: true when setup request is queued but not completed
 450  * @os_desc_pending: true when os_desc request is queued but not completed
 451  *
 452  * One of these devices is allocated and initialized before the
 453  * associated device driver's bind() is called.
 454  *
 455  * OPEN ISSUE:  it appears that some WUSB devices will need to be
 456  * built by combining a normal (wired) gadget with a wireless one.
 457  * This revision of the gadget framework should probably try to make
 458  * sure doing that won't hurt too much.
 459  *
 460  * One notion for how to handle Wireless USB devices involves:
 461  *
 462  * (a) a second gadget here, discovery mechanism TBD, but likely
 463  *     needing separate "register/unregister WUSB gadget" calls;
 464  * (b) updates to usb_gadget to include flags "is it wireless",
 465  *     "is it wired", plus (presumably in a wrapper structure)
 466  *     bandgroup and PHY info;
 467  * (c) presumably a wireless_ep wrapping a usb_ep, and reporting
 468  *     wireless-specific parameters like maxburst and maxsequence;
 469  * (d) configurations that are specific to wireless links;
 470  * (e) function drivers that understand wireless configs and will
 471  *     support wireless for (additional) function instances;
 472  * (f) a function to support association setup (like CBAF), not
 473  *     necessarily requiring a wireless adapter;
 474  * (g) composite device setup that can create one or more wireless
 475  *     configs, including appropriate association setup support;
 476  * (h) more, TBD.
 477  */
 478 struct usb_composite_dev {
 479         struct usb_gadget               *gadget;
 480         struct usb_request              *req;
 481         struct usb_request              *os_desc_req;
 482
 483         struct usb_configuration        *config;
 484
 485         /* OS String is a custom (yet popular) extension to the USB standard. */
 486         u8                              qw_sign[OS_STRING_QW_SIGN_LEN];
 487         u8                              b_vendor_code;
 488         struct usb_configuration        *os_desc_config;
 489         unsigned int                    use_os_string:1;
 490
 491         /* private: */
 492         /* internals */
 493         unsigned int                    suspended:1;
 494         struct usb_device_descriptor    desc;
 495         struct list_head                configs;
 496         struct list_head                gstrings;
 497         struct usb_composite_driver     *driver;
 498         u8                              next_string_id;
 499         char                            *def_manufacturer;
 500
 501         /* the gadget driver won't enable the data pullup
 502          * while the deactivation count is nonzero.
 503          */
 504         unsigned                        deactivations;
 505
 506         /* the composite driver won't complete the control transfer's
 507          * data/status stages till delayed_status is zero.
 508          */
 509         int                             delayed_status;
 510
 511         /* protects deactivations and delayed_status counts*/
 512         spinlock_t                      lock;
 513
 514         /* public: */
 515         unsigned int                    setup_pending:1;
 516         unsigned int                    os_desc_pending:1;
 517 };
 518
 519 extern int usb_string_id(struct usb_composite_dev *c);
 520 extern int usb_string_ids_tab(struct usb_composite_dev *c,
 521                               struct usb_string *str);
 522 extern struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
 523                 struct usb_gadget_strings **sp, unsigned n_strings);
 524
 525 extern int usb_string_ids_n(struct usb_composite_dev *c, unsigned n);
 526
 527 extern void composite_disconnect(struct usb_gadget *gadget);
 528 extern void composite_reset(struct usb_gadget *gadget);
 529
 530 extern int composite_setup(struct usb_gadget *gadget,
 531                 const struct usb_ctrlrequest *ctrl);
 532 extern void composite_suspend(struct usb_gadget *gadget);
 533 extern void composite_resume(struct usb_gadget *gadget);
 534
 535 /*
 536  * Some systems will need runtime overrides for the  product identifiers
 537  * published in the device descriptor, either numbers or strings or both.
 538  * String parameters are in UTF-8 (superset of ASCII's 7 bit characters).
 539  */
 540 struct usb_composite_overwrite {
 541         u16     idVendor;
 542         u16     idProduct;
 543         u16     bcdDevice;
 544         char    *serial_number;
 545         char    *manufacturer;
 546         char    *product;
 547 };
 548 #define USB_GADGET_COMPOSITE_OPTIONS()                                  \
 549         static struct usb_composite_overwrite coverwrite;               \
 550                                                                         \
 551         module_param_named(idVendor, coverwrite.idVendor, ushort, S_IRUGO); \
 552         MODULE_PARM_DESC(idVendor, "USB Vendor ID");                    \
 553                                                                         \
 554         module_param_named(idProduct, coverwrite.idProduct, ushort, S_IRUGO); \
 555         MODULE_PARM_DESC(idProduct, "USB Product ID");                  \
 556                                                                         \
 557         module_param_named(bcdDevice, coverwrite.bcdDevice, ushort, S_IRUGO); \
 558         MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");        \
 559                                                                         \
 560         module_param_named(iSerialNumber, coverwrite.serial_number, charp, \
 561                         S_IRUGO); \
 562         MODULE_PARM_DESC(iSerialNumber, "SerialNumber string");         \
 563                                                                         \
 564         module_param_named(iManufacturer, coverwrite.manufacturer, charp, \
 565                         S_IRUGO); \
 566         MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");     \
 567                                                                         \
 568         module_param_named(iProduct, coverwrite.product, charp, S_IRUGO); \
 569         MODULE_PARM_DESC(iProduct, "USB Product string")
 570
 571 void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
 572                 struct usb_composite_overwrite *covr);
 573
 574 static inline u16 get_default_bcdDevice(void)
 575 {
 576         u16 bcdDevice;
 577
 578         bcdDevice = bin2bcd(LINUX_VERSION_MAJOR) << 8;
 579         bcdDevice |= bin2bcd(LINUX_VERSION_PATCHLEVEL);
 580         return bcdDevice;
 581 }
 582
 583 struct usb_function_driver {
 584         const char *name;
 585         struct module *mod;
 586         struct list_head list;
 587         struct usb_function_instance *(*alloc_inst)(void);
 588         struct usb_function *(*alloc_func)(struct usb_function_instance *inst);
 589 };
 590
 591 struct usb_function_instance {
 592         struct config_group group;
 593         struct list_head cfs_list;
 594         struct usb_function_driver *fd;
 595         int (*set_inst_name)(struct usb_function_instance *inst,
 596                               const char *name);
 597         void (*free_func_inst)(struct usb_function_instance *inst);
 598 };
 599
 600 void usb_function_unregister(struct usb_function_driver *f);
 601 int usb_function_register(struct usb_function_driver *newf);
 602 void usb_put_function_instance(struct usb_function_instance *fi);
 603 void usb_put_function(struct usb_function *f);
 604 struct usb_function_instance *usb_get_function_instance(const char *name);
 605 struct usb_function *usb_get_function(struct usb_function_instance *fi);
 606
 607 struct usb_configuration *usb_get_config(struct usb_composite_dev *cdev,
 608                 int val);
 609 int usb_add_config_only(struct usb_composite_dev *cdev,
 610                 struct usb_configuration *config);
 611 void usb_remove_function(struct usb_configuration *c, struct usb_function *f);
 612
 613 #define DECLARE_USB_FUNCTION(_name, _inst_alloc, _func_alloc)           \
 614         static struct usb_function_driver _name ## usb_func = {         \
 615                 .name = __stringify(_name),                             \
 616                 .mod  = THIS_MODULE,                                    \
 617                 .alloc_inst = _inst_alloc,                              \
 618                 .alloc_func = _func_alloc,                              \
 619         };                                                              \
 620         MODULE_ALIAS("usbfunc:"__stringify(_name));
 621
 622 #define DECLARE_USB_FUNCTION_INIT(_name, _inst_alloc, _func_alloc)      \
 623         DECLARE_USB_FUNCTION(_name, _inst_alloc, _func_alloc)           \
 624         static int __init _name ## mod_init(void)                       \
 625         {                                                               \
 626                 return usb_function_register(&_name ## usb_func);       \
 627         }                                                               \
 628         static void __exit _name ## mod_exit(void)                      \
 629         {                                                               \
 630                 usb_function_unregister(&_name ## usb_func);            \
 631         }                                                               \
 632         module_init(_name ## mod_init);                                 \
 633         module_exit(_name ## mod_exit)
 634
 635 /* messaging utils */
 636 #define DBG(d, fmt, args...) \
 637         dev_dbg(&(d)->gadget->dev , fmt , ## args)
 638 #define VDBG(d, fmt, args...) \
 639         dev_vdbg(&(d)->gadget->dev , fmt , ## args)
 640 #define ERROR(d, fmt, args...) \
 641         dev_err(&(d)->gadget->dev , fmt , ## args)
 642 #define WARNING(d, fmt, args...) \
 643         dev_warn(&(d)->gadget->dev , fmt , ## args)
 644 #define INFO(d, fmt, args...) \
 645         dev_info(&(d)->gadget->dev , fmt , ## args)
 646
 647 #endif  /* __LINUX_USB_COMPOSITE_H */