1/* 2 * composite.h -- framework for usb gadgets which are composite devices 3 * 4 * Copyright (C) 2006-2008 David Brownell 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#ifndef __LINUX_USB_COMPOSITE_H 22#define __LINUX_USB_COMPOSITE_H 23 24/* 25 * This framework is an optional layer on top of the USB Gadget interface, 26 * making it easier to build (a) Composite devices, supporting multiple 27 * functions within any single configuration, and (b) Multi-configuration 28 * devices, also supporting multiple functions but without necessarily 29 * having more than one function per configuration. 30 * 31 * Example: a device with a single configuration supporting both network 32 * link and mass storage functions is a composite device. Those functions 33 * might alternatively be packaged in individual configurations, but in 34 * the composite model the host can use both functions at the same time. 35 */ 36 37#include <linux/bcd.h> 38#include <linux/version.h> 39#include <linux/usb/ch9.h> 40#include <linux/usb/gadget.h> 41#include <linux/log2.h> 42#include <linux/configfs.h> 43 44/* 45 * USB function drivers should return USB_GADGET_DELAYED_STATUS if they 46 * wish to delay the data/status stages of the control transfer till they 47 * are ready. The control transfer will then be kept from completing till 48 * all the function drivers that requested for USB_GADGET_DELAYED_STAUS 49 * invoke usb_composite_setup_continue(). 50 */ 51#define USB_GADGET_DELAYED_STATUS 0x7fff /* Impossibly large value */ 52 53/* big enough to hold our biggest descriptor */ 54#define USB_COMP_EP0_BUFSIZ 1024 55 56#define USB_MS_TO_HS_INTERVAL(x) (ilog2((x * 1000 / 125)) + 1) 57struct usb_configuration; 58 59/** 60 * struct usb_os_desc_ext_prop - describes one "Extended Property" 61 * @entry: used to keep a list of extended properties 62 * @type: Extended Property type 63 * @name_len: Extended Property unicode name length, including terminating '\0' 64 * @name: Extended Property name 65 * @data_len: Length of Extended Property blob (for unicode store double len) 66 * @data: Extended Property blob 67 * @item: Represents this Extended Property in configfs 68 */ 69struct usb_os_desc_ext_prop { 70 struct list_head entry; 71 u8 type; 72 int name_len; 73 char *name; 74 int data_len; 75 char *data; 76 struct config_item item; 77}; 78 79/** 80 * struct usb_os_desc - describes OS descriptors associated with one interface 81 * @ext_compat_id: 16 bytes of "Compatible ID" and "Subcompatible ID" 82 * @ext_prop: Extended Properties list 83 * @ext_prop_len: Total length of Extended Properties blobs 84 * @ext_prop_count: Number of Extended Properties 85 * @opts_mutex: Optional mutex protecting config data of a usb_function_instance 86 * @group: Represents OS descriptors associated with an interface in configfs 87 * @owner: Module associated with this OS descriptor 88 */ 89struct usb_os_desc { 90 char *ext_compat_id; 91 struct list_head ext_prop; 92 int ext_prop_len; 93 int ext_prop_count; 94 struct mutex *opts_mutex; 95 struct config_group group; 96 struct module *owner; 97}; 98 99/** 100 * struct usb_os_desc_table - describes OS descriptors associated with one 101 * interface of a usb_function 102 * @if_id: Interface id 103 * @os_desc: "Extended Compatibility ID" and "Extended Properties" of the 104 * interface 105 * 106 * Each interface can have at most one "Extended Compatibility ID" and a 107 * number of "Extended Properties". 108 */ 109struct usb_os_desc_table { 110 int if_id; 111 struct usb_os_desc *os_desc; 112}; 113 114/** 115 * struct usb_function - describes one function of a configuration 116 * @name: For diagnostics, identifies the function. 117 * @strings: tables of strings, keyed by identifiers assigned during bind() 118 * and by language IDs provided in control requests 119 * @fs_descriptors: Table of full (or low) speed descriptors, using interface and 120 * string identifiers assigned during @bind(). If this pointer is null, 121 * the function will not be available at full speed (or at low speed). 122 * @hs_descriptors: Table of high speed descriptors, using interface and 123 * string identifiers assigned during @bind(). If this pointer is null, 124 * the function will not be available at high speed. 125 * @ss_descriptors: Table of super speed descriptors, using interface and 126 * string identifiers assigned during @bind(). If this 127 * pointer is null after initiation, the function will not 128 * be available at super speed. 129 * @ssp_descriptors: Table of super speed plus descriptors, using 130 * interface and string identifiers assigned during @bind(). If 131 * this pointer is null after initiation, the function will not 132 * be available at super speed plus. 133 * @config: assigned when @usb_add_function() is called; this is the 134 * configuration with which this function is associated. 135 * @os_desc_table: Table of (interface id, os descriptors) pairs. The function 136 * can expose more than one interface. If an interface is a member of 137 * an IAD, only the first interface of IAD has its entry in the table. 138 * @os_desc_n: Number of entries in os_desc_table 139 * @bind: Before the gadget can register, all of its functions bind() to the 140 * available resources including string and interface identifiers used 141 * in interface or class descriptors; endpoints; I/O buffers; and so on. 142 * @unbind: Reverses @bind; called as a side effect of unregistering the 143 * driver which added this function. 144 * @free_func: free the struct usb_function. 145 * @mod: (internal) points to the module that created this structure. 146 * @set_alt: (REQUIRED) Reconfigures altsettings; function drivers may 147 * initialize usb_ep.driver data at this time (when it is used). 148 * Note that setting an interface to its current altsetting resets 149 * interface state, and that all interfaces have a disabled state. 150 * @get_alt: Returns the active altsetting. If this is not provided, 151 * then only altsetting zero is supported. 152 * @disable: (REQUIRED) Indicates the function should be disabled. Reasons 153 * include host resetting or reconfiguring the gadget, and disconnection. 154 * @setup: Used for interface-specific control requests. 155 * @req_match: Tests if a given class request can be handled by this function. 156 * @suspend: Notifies functions when the host stops sending USB traffic. 157 * @resume: Notifies functions when the host restarts USB traffic. 158 * @get_status: Returns function status as a reply to 159 * GetStatus() request when the recipient is Interface. 160 * @func_suspend: callback to be called when 161 * SetFeature(FUNCTION_SUSPEND) is reseived 162 * 163 * A single USB function uses one or more interfaces, and should in most 164 * cases support operation at both full and high speeds. Each function is 165 * associated by @usb_add_function() with a one configuration; that function 166 * causes @bind() to be called so resources can be allocated as part of 167 * setting up a gadget driver. Those resources include endpoints, which 168 * should be allocated using @usb_ep_autoconfig(). 169 * 170 * To support dual speed operation, a function driver provides descriptors 171 * for both high and full speed operation. Except in rare cases that don't 172 * involve bulk endpoints, each speed needs different endpoint descriptors. 173 * 174 * Function drivers choose their own strategies for managing instance data. 175 * The simplest strategy just declares it "static', which means the function 176 * can only be activated once. If the function needs to be exposed in more 177 * than one configuration at a given speed, it needs to support multiple 178 * usb_function structures (one for each configuration). 179 * 180 * A more complex strategy might encapsulate a @usb_function structure inside 181 * a driver-specific instance structure to allows multiple activations. An 182 * example of multiple activations might be a CDC ACM function that supports 183 * two or more distinct instances within the same configuration, providing 184 * several independent logical data links to a USB host. 185 */ 186 187struct usb_function { 188 const char *name; 189 struct usb_gadget_strings **strings; 190 struct usb_descriptor_header **fs_descriptors; 191 struct usb_descriptor_header **hs_descriptors; 192 struct usb_descriptor_header **ss_descriptors; 193 struct usb_descriptor_header **ssp_descriptors; 194 195 struct usb_configuration *config; 196 197 struct usb_os_desc_table *os_desc_table; 198 unsigned os_desc_n; 199 200 /* REVISIT: bind() functions can be marked __init, which 201 * makes trouble for section mismatch analysis. See if 202 * we can't restructure things to avoid mismatching. 203 * Related: unbind() may kfree() but bind() won't... 204 */ 205 206 /* configuration management: bind/unbind */ 207 int (*bind)(struct usb_configuration *, 208 struct usb_function *); 209 void (*unbind)(struct usb_configuration *, 210 struct usb_function *); 211 void (*free_func)(struct usb_function *f); 212 struct module *mod; 213 214 /* runtime state management */ 215 int (*set_alt)(struct usb_function *, 216 unsigned interface, unsigned alt); 217 int (*get_alt)(struct usb_function *, 218 unsigned interface); 219 void (*disable)(struct usb_function *); 220 int (*setup)(struct usb_function *, 221 const struct usb_ctrlrequest *); 222 bool (*req_match)(struct usb_function *, 223 const struct usb_ctrlrequest *, 224 bool config0); 225 void (*suspend)(struct usb_function *); 226 void (*resume)(struct usb_function *); 227 228 /* USB 3.0 additions */ 229 int (*get_status)(struct usb_function *); 230 int (*func_suspend)(struct usb_function *, 231 u8 suspend_opt); 232 /* private: */ 233 /* internals */ 234 struct list_head list; 235 DECLARE_BITMAP(endpoints, 32); 236 const struct usb_function_instance *fi; 237 238 unsigned int bind_deactivated:1; 239}; 240 241int usb_add_function(struct usb_configuration *, struct usb_function *); 242 243int usb_function_deactivate(struct usb_function *); 244int usb_function_activate(struct usb_function *); 245 246int usb_interface_id(struct usb_configuration *, struct usb_function *); 247 248int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f, 249 struct usb_ep *_ep); 250 251#define MAX_CONFIG_INTERFACES 16 /* arbitrary; max 255 */ 252 253/** 254 * struct usb_configuration - represents one gadget configuration 255 * @label: For diagnostics, describes the configuration. 256 * @strings: Tables of strings, keyed by identifiers assigned during @bind() 257 * and by language IDs provided in control requests. 258 * @descriptors: Table of descriptors preceding all function descriptors. 259 * Examples include OTG and vendor-specific descriptors. 260 * @unbind: Reverses @bind; called as a side effect of unregistering the 261 * driver which added this configuration. 262 * @setup: Used to delegate control requests that aren't handled by standard 263 * device infrastructure or directed at a specific interface. 264 * @bConfigurationValue: Copied into configuration descriptor. 265 * @iConfiguration: Copied into configuration descriptor. 266 * @bmAttributes: Copied into configuration descriptor. 267 * @MaxPower: Power consumtion in mA. Used to compute bMaxPower in the 268 * configuration descriptor after considering the bus speed. 269 * @cdev: assigned by @usb_add_config() before calling @bind(); this is 270 * the device associated with this configuration. 271 * 272 * Configurations are building blocks for gadget drivers structured around 273 * function drivers. Simple USB gadgets require only one function and one 274 * configuration, and handle dual-speed hardware by always providing the same 275 * functionality. Slightly more complex gadgets may have more than one 276 * single-function configuration at a given speed; or have configurations 277 * that only work at one speed. 278 * 279 * Composite devices are, by definition, ones with configurations which 280 * include more than one function. 281 * 282 * The lifecycle of a usb_configuration includes allocation, initialization 283 * of the fields described above, and calling @usb_add_config() to set up 284 * internal data and bind it to a specific device. The configuration's 285 * @bind() method is then used to initialize all the functions and then 286 * call @usb_add_function() for them. 287 * 288 * Those functions would normally be independent of each other, but that's 289 * not mandatory. CDC WMC devices are an example where functions often 290 * depend on other functions, with some functions subsidiary to others. 291 * Such interdependency may be managed in any way, so long as all of the 292 * descriptors complete by the time the composite driver returns from 293 * its bind() routine. 294 */ 295struct usb_configuration { 296 const char *label; 297 struct usb_gadget_strings **strings; 298 const struct usb_descriptor_header **descriptors; 299 300 /* REVISIT: bind() functions can be marked __init, which 301 * makes trouble for section mismatch analysis. See if 302 * we can't restructure things to avoid mismatching... 303 */ 304 305 /* configuration management: unbind/setup */ 306 void (*unbind)(struct usb_configuration *); 307 int (*setup)(struct usb_configuration *, 308 const struct usb_ctrlrequest *); 309 310 /* fields in the config descriptor */ 311 u8 bConfigurationValue; 312 u8 iConfiguration; 313 u8 bmAttributes; 314 u16 MaxPower; 315 316 struct usb_composite_dev *cdev; 317 318 /* private: */ 319 /* internals */ 320 struct list_head list; 321 struct list_head functions; 322 u8 next_interface_id; 323 unsigned superspeed:1; 324 unsigned highspeed:1; 325 unsigned fullspeed:1; 326 unsigned superspeed_plus:1; 327 struct usb_function *interface[MAX_CONFIG_INTERFACES]; 328}; 329 330int usb_add_config(struct usb_composite_dev *, 331 struct usb_configuration *, 332 int (*)(struct usb_configuration *)); 333 334void usb_remove_config(struct usb_composite_dev *, 335 struct usb_configuration *); 336 337/* predefined index for usb_composite_driver */ 338enum { 339 USB_GADGET_MANUFACTURER_IDX = 0, 340 USB_GADGET_PRODUCT_IDX, 341 USB_GADGET_SERIAL_IDX, 342 USB_GADGET_FIRST_AVAIL_IDX, 343}; 344 345/** 346 * struct usb_composite_driver - groups configurations into a gadget 347 * @name: For diagnostics, identifies the driver. 348 * @dev: Template descriptor for the device, including default device 349 * identifiers. 350 * @strings: tables of strings, keyed by identifiers assigned during @bind 351 * and language IDs provided in control requests. Note: The first entries 352 * are predefined. The first entry that may be used is 353 * USB_GADGET_FIRST_AVAIL_IDX 354 * @max_speed: Highest speed the driver supports. 355 * @needs_serial: set to 1 if the gadget needs userspace to provide 356 * a serial number. If one is not provided, warning will be printed. 357 * @bind: (REQUIRED) Used to allocate resources that are shared across the 358 * whole device, such as string IDs, and add its configurations using 359 * @usb_add_config(). This may fail by returning a negative errno 360 * value; it should return zero on successful initialization. 361 * @unbind: Reverses @bind; called as a side effect of unregistering 362 * this driver. 363 * @disconnect: optional driver disconnect method 364 * @suspend: Notifies when the host stops sending USB traffic, 365 * after function notifications 366 * @resume: Notifies configuration when the host restarts USB traffic, 367 * before function notifications 368 * @gadget_driver: Gadget driver controlling this driver 369 * 370 * Devices default to reporting self powered operation. Devices which rely 371 * on bus powered operation should report this in their @bind method. 372 * 373 * Before returning from @bind, various fields in the template descriptor 374 * may be overridden. These include the idVendor/idProduct/bcdDevice values 375 * normally to bind the appropriate host side driver, and the three strings 376 * (iManufacturer, iProduct, iSerialNumber) normally used to provide user 377 * meaningful device identifiers. (The strings will not be defined unless 378 * they are defined in @dev and @strings.) The correct ep0 maxpacket size 379 * is also reported, as defined by the underlying controller driver. 380 */ 381struct usb_composite_driver { 382 const char *name; 383 const struct usb_device_descriptor *dev; 384 struct usb_gadget_strings **strings; 385 enum usb_device_speed max_speed; 386 unsigned needs_serial:1; 387 388 int (*bind)(struct usb_composite_dev *cdev); 389 int (*unbind)(struct usb_composite_dev *); 390 391 void (*disconnect)(struct usb_composite_dev *); 392 393 /* global suspend hooks */ 394 void (*suspend)(struct usb_composite_dev *); 395 void (*resume)(struct usb_composite_dev *); 396 struct usb_gadget_driver gadget_driver; 397}; 398 399extern int usb_composite_probe(struct usb_composite_driver *driver); 400extern void usb_composite_unregister(struct usb_composite_driver *driver); 401 402/** 403 * module_usb_composite_driver() - Helper macro for registering a USB gadget 404 * composite driver 405 * @__usb_composite_driver: usb_composite_driver struct 406 * 407 * Helper macro for USB gadget composite drivers which do not do anything 408 * special in module init/exit. This eliminates a lot of boilerplate. Each 409 * module may only use this macro once, and calling it replaces module_init() 410 * and module_exit() 411 */ 412#define module_usb_composite_driver(__usb_composite_driver) \ 413 module_driver(__usb_composite_driver, usb_composite_probe, \ 414 usb_composite_unregister) 415 416extern void usb_composite_setup_continue(struct usb_composite_dev *cdev); 417extern int composite_dev_prepare(struct usb_composite_driver *composite, 418 struct usb_composite_dev *cdev); 419extern int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 420 struct usb_ep *ep0); 421void composite_dev_cleanup(struct usb_composite_dev *cdev); 422 423static inline struct usb_composite_driver *to_cdriver( 424 struct usb_gadget_driver *gdrv) 425{ 426 return container_of(gdrv, struct usb_composite_driver, gadget_driver); 427} 428 429#define OS_STRING_QW_SIGN_LEN 14 430#define OS_STRING_IDX 0xEE 431 432/** 433 * struct usb_composite_device - represents one composite usb gadget 434 * @gadget: read-only, abstracts the gadget's usb peripheral controller 435 * @req: used for control responses; buffer is pre-allocated 436 * @os_desc_req: used for OS descriptors responses; buffer is pre-allocated 437 * @config: the currently active configuration 438 * @qw_sign: qwSignature part of the OS string 439 * @b_vendor_code: bMS_VendorCode part of the OS string 440 * @use_os_string: false by default, interested gadgets set it 441 * @os_desc_config: the configuration to be used with OS descriptors 442 * @setup_pending: true when setup request is queued but not completed 443 * @os_desc_pending: true when os_desc request is queued but not completed 444 * 445 * One of these devices is allocated and initialized before the 446 * associated device driver's bind() is called. 447 * 448 * OPEN ISSUE: it appears that some WUSB devices will need to be 449 * built by combining a normal (wired) gadget with a wireless one. 450 * This revision of the gadget framework should probably try to make 451 * sure doing that won't hurt too much. 452 * 453 * One notion for how to handle Wireless USB devices involves: 454 * 455 * (a) a second gadget here, discovery mechanism TBD, but likely 456 * needing separate "register/unregister WUSB gadget" calls; 457 * (b) updates to usb_gadget to include flags "is it wireless", 458 * "is it wired", plus (presumably in a wrapper structure) 459 * bandgroup and PHY info; 460 * (c) presumably a wireless_ep wrapping a usb_ep, and reporting 461 * wireless-specific parameters like maxburst and maxsequence; 462 * (d) configurations that are specific to wireless links; 463 * (e) function drivers that understand wireless configs and will 464 * support wireless for (additional) function instances; 465 * (f) a function to support association setup (like CBAF), not 466 * necessarily requiring a wireless adapter; 467 * (g) composite device setup that can create one or more wireless 468 * configs, including appropriate association setup support; 469 * (h) more, TBD. 470 */ 471struct usb_composite_dev { 472 struct usb_gadget *gadget; 473 struct usb_request *req; 474 struct usb_request *os_desc_req; 475 476 struct usb_configuration *config; 477 478 /* OS String is a custom (yet popular) extension to the USB standard. */ 479 u8 qw_sign[OS_STRING_QW_SIGN_LEN]; 480 u8 b_vendor_code; 481 struct usb_configuration *os_desc_config; 482 unsigned int use_os_string:1; 483 484 /* private: */ 485 /* internals */ 486 unsigned int suspended:1; 487 struct usb_device_descriptor desc; 488 struct list_head configs; 489 struct list_head gstrings; 490 struct usb_composite_driver *driver; 491 u8 next_string_id; 492 char *def_manufacturer; 493 494 /* the gadget driver won't enable the data pullup 495 * while the deactivation count is nonzero. 496 */ 497 unsigned deactivations; 498 499 /* the composite driver won't complete the control transfer's 500 * data/status stages till delayed_status is zero. 501 */ 502 int delayed_status; 503 504 /* protects deactivations and delayed_status counts*/ 505 spinlock_t lock; 506 507 /* public: */ 508 unsigned int setup_pending:1; 509 unsigned int os_desc_pending:1; 510}; 511 512extern int usb_string_id(struct usb_composite_dev *c); 513extern int usb_string_ids_tab(struct usb_composite_dev *c, 514 struct usb_string *str); 515extern struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev, 516 struct usb_gadget_strings **sp, unsigned n_strings); 517 518extern int usb_string_ids_n(struct usb_composite_dev *c, unsigned n); 519 520extern void composite_disconnect(struct usb_gadget *gadget); 521extern int composite_setup(struct usb_gadget *gadget, 522 const struct usb_ctrlrequest *ctrl); 523extern void composite_suspend(struct usb_gadget *gadget); 524extern void composite_resume(struct usb_gadget *gadget); 525 526/* 527 * Some systems will need runtime overrides for the product identifiers 528 * published in the device descriptor, either numbers or strings or both. 529 * String parameters are in UTF-8 (superset of ASCII's 7 bit characters). 530 */ 531struct usb_composite_overwrite { 532 u16 idVendor; 533 u16 idProduct; 534 u16 bcdDevice; 535 char *serial_number; 536 char *manufacturer; 537 char *product; 538}; 539#define USB_GADGET_COMPOSITE_OPTIONS() \ 540 static struct usb_composite_overwrite coverwrite; \ 541 \ 542 module_param_named(idVendor, coverwrite.idVendor, ushort, S_IRUGO); \ 543 MODULE_PARM_DESC(idVendor, "USB Vendor ID"); \ 544 \ 545 module_param_named(idProduct, coverwrite.idProduct, ushort, S_IRUGO); \ 546 MODULE_PARM_DESC(idProduct, "USB Product ID"); \ 547 \ 548 module_param_named(bcdDevice, coverwrite.bcdDevice, ushort, S_IRUGO); \ 549 MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)"); \ 550 \ 551 module_param_named(iSerialNumber, coverwrite.serial_number, charp, \ 552 S_IRUGO); \ 553 MODULE_PARM_DESC(iSerialNumber, "SerialNumber string"); \ 554 \ 555 module_param_named(iManufacturer, coverwrite.manufacturer, charp, \ 556 S_IRUGO); \ 557 MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); \ 558 \ 559 module_param_named(iProduct, coverwrite.product, charp, S_IRUGO); \ 560 MODULE_PARM_DESC(iProduct, "USB Product string") 561 562void usb_composite_overwrite_options(struct usb_composite_dev *cdev, 563 struct usb_composite_overwrite *covr); 564 565static inline u16 get_default_bcdDevice(void) 566{ 567 u16 bcdDevice; 568 569 bcdDevice = bin2bcd((LINUX_VERSION_CODE >> 16 & 0xff)) << 8; 570 bcdDevice |= bin2bcd((LINUX_VERSION_CODE >> 8 & 0xff)); 571 return bcdDevice; 572} 573 574struct usb_function_driver { 575 const char *name; 576 struct module *mod; 577 struct list_head list; 578 struct usb_function_instance *(*alloc_inst)(void); 579 struct usb_function *(*alloc_func)(struct usb_function_instance *inst); 580}; 581 582struct usb_function_instance { 583 struct config_group group; 584 struct list_head cfs_list; 585 struct usb_function_driver *fd; 586 int (*set_inst_name)(struct usb_function_instance *inst, 587 const char *name); 588 void (*free_func_inst)(struct usb_function_instance *inst); 589}; 590 591void usb_function_unregister(struct usb_function_driver *f); 592int usb_function_register(struct usb_function_driver *newf); 593void usb_put_function_instance(struct usb_function_instance *fi); 594void usb_put_function(struct usb_function *f); 595struct usb_function_instance *usb_get_function_instance(const char *name); 596struct usb_function *usb_get_function(struct usb_function_instance *fi); 597 598struct usb_configuration *usb_get_config(struct usb_composite_dev *cdev, 599 int val); 600int usb_add_config_only(struct usb_composite_dev *cdev, 601 struct usb_configuration *config); 602void usb_remove_function(struct usb_configuration *c, struct usb_function *f); 603 604#define DECLARE_USB_FUNCTION(_name, _inst_alloc, _func_alloc) \ 605 static struct usb_function_driver _name ## usb_func = { \ 606 .name = __stringify(_name), \ 607 .mod = THIS_MODULE, \ 608 .alloc_inst = _inst_alloc, \ 609 .alloc_func = _func_alloc, \ 610 }; \ 611 MODULE_ALIAS("usbfunc:"__stringify(_name)); 612 613#define DECLARE_USB_FUNCTION_INIT(_name, _inst_alloc, _func_alloc) \ 614 DECLARE_USB_FUNCTION(_name, _inst_alloc, _func_alloc) \ 615 static int __init _name ## mod_init(void) \ 616 { \ 617 return usb_function_register(&_name ## usb_func); \ 618 } \ 619 static void __exit _name ## mod_exit(void) \ 620 { \ 621 usb_function_unregister(&_name ## usb_func); \ 622 } \ 623 module_init(_name ## mod_init); \ 624 module_exit(_name ## mod_exit) 625 626/* messaging utils */ 627#define DBG(d, fmt, args...) \ 628 dev_dbg(&(d)->gadget->dev , fmt , ## args) 629#define VDBG(d, fmt, args...) \ 630 dev_vdbg(&(d)->gadget->dev , fmt , ## args) 631#define ERROR(d, fmt, args...) \ 632 dev_err(&(d)->gadget->dev , fmt , ## args) 633#define WARNING(d, fmt, args...) \ 634 dev_warn(&(d)->gadget->dev , fmt , ## args) 635#define INFO(d, fmt, args...) \ 636 dev_info(&(d)->gadget->dev , fmt , ## args) 637 638#endif /* __LINUX_USB_COMPOSITE_H */ 639