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) 57 struct 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 */ 69 struct 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 */ 89 struct 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 */ 109 struct 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 */ 186 187 struct 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 void (*suspend)(struct usb_function *); 225 void (*resume)(struct usb_function *); 226 227 /* USB 3.0 additions */ 228 int (*get_status)(struct usb_function *); 229 int (*func_suspend)(struct usb_function *, 230 u8 suspend_opt); 231 /* private: */ 232 /* internals */ 233 struct list_head list; 234 DECLARE_BITMAP(endpoints, 32); 235 const struct usb_function_instance *fi; 236 237 unsigned int bind_deactivated:1; 238 }; 239 240 int usb_add_function(struct usb_configuration *, struct usb_function *); 241 242 int usb_function_deactivate(struct usb_function *); 243 int usb_function_activate(struct usb_function *); 244 245 int usb_interface_id(struct usb_configuration *, struct usb_function *); 246 247 int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f, 248 struct usb_ep *_ep); 249 250 #define MAX_CONFIG_INTERFACES 16 /* arbitrary; max 255 */ 251 252 /** 253 * struct usb_configuration - represents one gadget configuration 254 * @label: For diagnostics, describes the configuration. 255 * @strings: Tables of strings, keyed by identifiers assigned during @bind() 256 * and by language IDs provided in control requests. 257 * @descriptors: Table of descriptors preceding all function descriptors. 258 * Examples include OTG and vendor-specific descriptors. 259 * @unbind: Reverses @bind; called as a side effect of unregistering the 260 * driver which added this configuration. 261 * @setup: Used to delegate control requests that aren't handled by standard 262 * device infrastructure or directed at a specific interface. 263 * @bConfigurationValue: Copied into configuration descriptor. 264 * @iConfiguration: Copied into configuration descriptor. 265 * @bmAttributes: Copied into configuration descriptor. 266 * @MaxPower: Power consumtion in mA. Used to compute bMaxPower in the 267 * configuration descriptor after considering the bus speed. 268 * @cdev: assigned by @usb_add_config() before calling @bind(); this is 269 * the device associated with this configuration. 270 * 271 * Configurations are building blocks for gadget drivers structured around 272 * function drivers. Simple USB gadgets require only one function and one 273 * configuration, and handle dual-speed hardware by always providing the same 274 * functionality. Slightly more complex gadgets may have more than one 275 * single-function configuration at a given speed; or have configurations 276 * that only work at one speed. 277 * 278 * Composite devices are, by definition, ones with configurations which 279 * include more than one function. 280 * 281 * The lifecycle of a usb_configuration includes allocation, initialization 282 * of the fields described above, and calling @usb_add_config() to set up 283 * internal data and bind it to a specific device. The configuration's 284 * @bind() method is then used to initialize all the functions and then 285 * call @usb_add_function() for them. 286 * 287 * Those functions would normally be independent of each other, but that's 288 * not mandatory. CDC WMC devices are an example where functions often 289 * depend on other functions, with some functions subsidiary to others. 290 * Such interdependency may be managed in any way, so long as all of the 291 * descriptors complete by the time the composite driver returns from 292 * its bind() routine. 293 */ 294 struct usb_configuration { 295 const char *label; 296 struct usb_gadget_strings **strings; 297 const struct usb_descriptor_header **descriptors; 298 299 /* REVISIT: bind() functions can be marked __init, which 300 * makes trouble for section mismatch analysis. See if 301 * we can't restructure things to avoid mismatching... 302 */ 303 304 /* configuration management: unbind/setup */ 305 void (*unbind)(struct usb_configuration *); 306 int (*setup)(struct usb_configuration *, 307 const struct usb_ctrlrequest *); 308 309 /* fields in the config descriptor */ 310 u8 bConfigurationValue; 311 u8 iConfiguration; 312 u8 bmAttributes; 313 u16 MaxPower; 314 315 struct usb_composite_dev *cdev; 316 317 /* private: */ 318 /* internals */ 319 struct list_head list; 320 struct list_head functions; 321 u8 next_interface_id; 322 unsigned superspeed:1; 323 unsigned highspeed:1; 324 unsigned fullspeed:1; 325 unsigned superspeed_plus:1; 326 struct usb_function *interface[MAX_CONFIG_INTERFACES]; 327 }; 328 329 int usb_add_config(struct usb_composite_dev *, 330 struct usb_configuration *, 331 int (*)(struct usb_configuration *)); 332 333 void usb_remove_config(struct usb_composite_dev *, 334 struct usb_configuration *); 335 336 /* predefined index for usb_composite_driver */ 337 enum { 338 USB_GADGET_MANUFACTURER_IDX = 0, 339 USB_GADGET_PRODUCT_IDX, 340 USB_GADGET_SERIAL_IDX, 341 USB_GADGET_FIRST_AVAIL_IDX, 342 }; 343 344 /** 345 * struct usb_composite_driver - groups configurations into a gadget 346 * @name: For diagnostics, identifies the driver. 347 * @dev: Template descriptor for the device, including default device 348 * identifiers. 349 * @strings: tables of strings, keyed by identifiers assigned during @bind 350 * and language IDs provided in control requests. Note: The first entries 351 * are predefined. The first entry that may be used is 352 * USB_GADGET_FIRST_AVAIL_IDX 353 * @max_speed: Highest speed the driver supports. 354 * @needs_serial: set to 1 if the gadget needs userspace to provide 355 * a serial number. If one is not provided, warning will be printed. 356 * @bind: (REQUIRED) Used to allocate resources that are shared across the 357 * whole device, such as string IDs, and add its configurations using 358 * @usb_add_config(). This may fail by returning a negative errno 359 * value; it should return zero on successful initialization. 360 * @unbind: Reverses @bind; called as a side effect of unregistering 361 * this driver. 362 * @disconnect: optional driver disconnect method 363 * @suspend: Notifies when the host stops sending USB traffic, 364 * after function notifications 365 * @resume: Notifies configuration when the host restarts USB traffic, 366 * before function notifications 367 * @gadget_driver: Gadget driver controlling this driver 368 * 369 * Devices default to reporting self powered operation. Devices which rely 370 * on bus powered operation should report this in their @bind method. 371 * 372 * Before returning from @bind, various fields in the template descriptor 373 * may be overridden. These include the idVendor/idProduct/bcdDevice values 374 * normally to bind the appropriate host side driver, and the three strings 375 * (iManufacturer, iProduct, iSerialNumber) normally used to provide user 376 * meaningful device identifiers. (The strings will not be defined unless 377 * they are defined in @dev and @strings.) The correct ep0 maxpacket size 378 * is also reported, as defined by the underlying controller driver. 379 */ 380 struct usb_composite_driver { 381 const char *name; 382 const struct usb_device_descriptor *dev; 383 struct usb_gadget_strings **strings; 384 enum usb_device_speed max_speed; 385 unsigned needs_serial:1; 386 387 int (*bind)(struct usb_composite_dev *cdev); 388 int (*unbind)(struct usb_composite_dev *); 389 390 void (*disconnect)(struct usb_composite_dev *); 391 392 /* global suspend hooks */ 393 void (*suspend)(struct usb_composite_dev *); 394 void (*resume)(struct usb_composite_dev *); 395 struct usb_gadget_driver gadget_driver; 396 }; 397 398 extern int usb_composite_probe(struct usb_composite_driver *driver); 399 extern void usb_composite_unregister(struct usb_composite_driver *driver); 400 401 /** 402 * module_usb_composite_driver() - Helper macro for registering a USB gadget 403 * composite driver 404 * @__usb_composite_driver: usb_composite_driver struct 405 * 406 * Helper macro for USB gadget composite drivers which do not do anything 407 * special in module init/exit. This eliminates a lot of boilerplate. Each 408 * module may only use this macro once, and calling it replaces module_init() 409 * and module_exit() 410 */ 411 #define module_usb_composite_driver(__usb_composite_driver) \ 412 module_driver(__usb_composite_driver, usb_composite_probe, \ 413 usb_composite_unregister) 414 415 extern void usb_composite_setup_continue(struct usb_composite_dev *cdev); 416 extern int composite_dev_prepare(struct usb_composite_driver *composite, 417 struct usb_composite_dev *cdev); 418 extern int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 419 struct usb_ep *ep0); 420 void composite_dev_cleanup(struct usb_composite_dev *cdev); 421 422 static inline struct usb_composite_driver *to_cdriver( 423 struct usb_gadget_driver *gdrv) 424 { 425 return container_of(gdrv, struct usb_composite_driver, gadget_driver); 426 } 427 428 #define OS_STRING_QW_SIGN_LEN 14 429 #define OS_STRING_IDX 0xEE 430 431 /** 432 * struct usb_composite_device - represents one composite usb gadget 433 * @gadget: read-only, abstracts the gadget's usb peripheral controller 434 * @req: used for control responses; buffer is pre-allocated 435 * @os_desc_req: used for OS descriptors responses; buffer is pre-allocated 436 * @config: the currently active configuration 437 * @qw_sign: qwSignature part of the OS string 438 * @b_vendor_code: bMS_VendorCode part of the OS string 439 * @use_os_string: false by default, interested gadgets set it 440 * @os_desc_config: the configuration to be used with OS descriptors 441 * @setup_pending: true when setup request is queued but not completed 442 * @os_desc_pending: true when os_desc request is queued but not completed 443 * 444 * One of these devices is allocated and initialized before the 445 * associated device driver's bind() is called. 446 * 447 * OPEN ISSUE: it appears that some WUSB devices will need to be 448 * built by combining a normal (wired) gadget with a wireless one. 449 * This revision of the gadget framework should probably try to make 450 * sure doing that won't hurt too much. 451 * 452 * One notion for how to handle Wireless USB devices involves: 453 * (a) a second gadget here, discovery mechanism TBD, but likely 454 * needing separate "register/unregister WUSB gadget" calls; 455 * (b) updates to usb_gadget to include flags "is it wireless", 456 * "is it wired", plus (presumably in a wrapper structure) 457 * bandgroup and PHY info; 458 * (c) presumably a wireless_ep wrapping a usb_ep, and reporting 459 * wireless-specific parameters like maxburst and maxsequence; 460 * (d) configurations that are specific to wireless links; 461 * (e) function drivers that understand wireless configs and will 462 * support wireless for (additional) function instances; 463 * (f) a function to support association setup (like CBAF), not 464 * necessarily requiring a wireless adapter; 465 * (g) composite device setup that can create one or more wireless 466 * configs, including appropriate association setup support; 467 * (h) more, TBD. 468 */ 469 struct usb_composite_dev { 470 struct usb_gadget *gadget; 471 struct usb_request *req; 472 struct usb_request *os_desc_req; 473 474 struct usb_configuration *config; 475 476 /* OS String is a custom (yet popular) extension to the USB standard. */ 477 u8 qw_sign[OS_STRING_QW_SIGN_LEN]; 478 u8 b_vendor_code; 479 struct usb_configuration *os_desc_config; 480 unsigned int use_os_string:1; 481 482 /* private: */ 483 /* internals */ 484 unsigned int suspended:1; 485 struct usb_device_descriptor desc; 486 struct list_head configs; 487 struct list_head gstrings; 488 struct usb_composite_driver *driver; 489 u8 next_string_id; 490 char *def_manufacturer; 491 492 /* the gadget driver won't enable the data pullup 493 * while the deactivation count is nonzero. 494 */ 495 unsigned deactivations; 496 497 /* the composite driver won't complete the control transfer's 498 * data/status stages till delayed_status is zero. 499 */ 500 int delayed_status; 501 502 /* protects deactivations and delayed_status counts*/ 503 spinlock_t lock; 504 505 unsigned setup_pending:1; 506 unsigned os_desc_pending:1; 507 }; 508 509 extern int usb_string_id(struct usb_composite_dev *c); 510 extern int usb_string_ids_tab(struct usb_composite_dev *c, 511 struct usb_string *str); 512 extern struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev, 513 struct usb_gadget_strings **sp, unsigned n_strings); 514 515 extern int usb_string_ids_n(struct usb_composite_dev *c, unsigned n); 516 517 extern void composite_disconnect(struct usb_gadget *gadget); 518 extern int composite_setup(struct usb_gadget *gadget, 519 const struct usb_ctrlrequest *ctrl); 520 extern void composite_suspend(struct usb_gadget *gadget); 521 extern void composite_resume(struct usb_gadget *gadget); 522 523 /* 524 * Some systems will need runtime overrides for the product identifiers 525 * published in the device descriptor, either numbers or strings or both. 526 * String parameters are in UTF-8 (superset of ASCII's 7 bit characters). 527 */ 528 struct usb_composite_overwrite { 529 u16 idVendor; 530 u16 idProduct; 531 u16 bcdDevice; 532 char *serial_number; 533 char *manufacturer; 534 char *product; 535 }; 536 #define USB_GADGET_COMPOSITE_OPTIONS() \ 537 static struct usb_composite_overwrite coverwrite; \ 538 \ 539 module_param_named(idVendor, coverwrite.idVendor, ushort, S_IRUGO); \ 540 MODULE_PARM_DESC(idVendor, "USB Vendor ID"); \ 541 \ 542 module_param_named(idProduct, coverwrite.idProduct, ushort, S_IRUGO); \ 543 MODULE_PARM_DESC(idProduct, "USB Product ID"); \ 544 \ 545 module_param_named(bcdDevice, coverwrite.bcdDevice, ushort, S_IRUGO); \ 546 MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)"); \ 547 \ 548 module_param_named(iSerialNumber, coverwrite.serial_number, charp, \ 549 S_IRUGO); \ 550 MODULE_PARM_DESC(iSerialNumber, "SerialNumber string"); \ 551 \ 552 module_param_named(iManufacturer, coverwrite.manufacturer, charp, \ 553 S_IRUGO); \ 554 MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); \ 555 \ 556 module_param_named(iProduct, coverwrite.product, charp, S_IRUGO); \ 557 MODULE_PARM_DESC(iProduct, "USB Product string") 558 559 void usb_composite_overwrite_options(struct usb_composite_dev *cdev, 560 struct usb_composite_overwrite *covr); 561 562 static inline u16 get_default_bcdDevice(void) 563 { 564 u16 bcdDevice; 565 566 bcdDevice = bin2bcd((LINUX_VERSION_CODE >> 16 & 0xff)) << 8; 567 bcdDevice |= bin2bcd((LINUX_VERSION_CODE >> 8 & 0xff)); 568 return bcdDevice; 569 } 570 571 struct usb_function_driver { 572 const char *name; 573 struct module *mod; 574 struct list_head list; 575 struct usb_function_instance *(*alloc_inst)(void); 576 struct usb_function *(*alloc_func)(struct usb_function_instance *inst); 577 }; 578 579 struct usb_function_instance { 580 struct config_group group; 581 struct list_head cfs_list; 582 struct usb_function_driver *fd; 583 int (*set_inst_name)(struct usb_function_instance *inst, 584 const char *name); 585 void (*free_func_inst)(struct usb_function_instance *inst); 586 }; 587 588 void usb_function_unregister(struct usb_function_driver *f); 589 int usb_function_register(struct usb_function_driver *newf); 590 void usb_put_function_instance(struct usb_function_instance *fi); 591 void usb_put_function(struct usb_function *f); 592 struct usb_function_instance *usb_get_function_instance(const char *name); 593 struct usb_function *usb_get_function(struct usb_function_instance *fi); 594 595 struct usb_configuration *usb_get_config(struct usb_composite_dev *cdev, 596 int val); 597 int usb_add_config_only(struct usb_composite_dev *cdev, 598 struct usb_configuration *config); 599 void usb_remove_function(struct usb_configuration *c, struct usb_function *f); 600 601 #define DECLARE_USB_FUNCTION(_name, _inst_alloc, _func_alloc) \ 602 static struct usb_function_driver _name ## usb_func = { \ 603 .name = __stringify(_name), \ 604 .mod = THIS_MODULE, \ 605 .alloc_inst = _inst_alloc, \ 606 .alloc_func = _func_alloc, \ 607 }; \ 608 MODULE_ALIAS("usbfunc:"__stringify(_name)); 609 610 #define DECLARE_USB_FUNCTION_INIT(_name, _inst_alloc, _func_alloc) \ 611 DECLARE_USB_FUNCTION(_name, _inst_alloc, _func_alloc) \ 612 static int __init _name ## mod_init(void) \ 613 { \ 614 return usb_function_register(&_name ## usb_func); \ 615 } \ 616 static void __exit _name ## mod_exit(void) \ 617 { \ 618 usb_function_unregister(&_name ## usb_func); \ 619 } \ 620 module_init(_name ## mod_init); \ 621 module_exit(_name ## mod_exit) 622 623 /* messaging utils */ 624 #define DBG(d, fmt, args...) \ 625 dev_dbg(&(d)->gadget->dev , fmt , ## args) 626 #define VDBG(d, fmt, args...) \ 627 dev_vdbg(&(d)->gadget->dev , fmt , ## args) 628 #define ERROR(d, fmt, args...) \ 629 dev_err(&(d)->gadget->dev , fmt , ## args) 630 #define WARNING(d, fmt, args...) \ 631 dev_warn(&(d)->gadget->dev , fmt , ## args) 632 #define INFO(d, fmt, args...) \ 633 dev_info(&(d)->gadget->dev , fmt , ## args) 634 635 #endif /* __LINUX_USB_COMPOSITE_H */ 636