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
8 #ifndef __LINUX_USB_COMPOSITE_H
9 #define __LINUX_USB_COMPOSITE_H
10
11 /*
12 * This framework is an optional layer on top of the USB Gadget interface,
13 * making it easier to build (a) Composite devices, supporting multiple
14 * functions within any single configuration, and (b) Multi-configuration
15 * devices, also supporting multiple functions but without necessarily
16 * having more than one function per configuration.
17 *
18 * Example: a device with a single configuration supporting both network
19 * link and mass storage functions is a composite device. Those functions
20 * might alternatively be packaged in individual configurations, but in
21 * the composite model the host can use both functions at the same time.
22 */
23
24 #include <linux/bcd.h>
25 #include <linux/version.h>
26 #include <linux/usb/ch9.h>
27 #include <linux/usb/gadget.h>
28 #include <linux/usb/webusb.h>
29 #include <linux/log2.h>
30 #include <linux/configfs.h>
31
32 /*
33 * USB function drivers should return USB_GADGET_DELAYED_STATUS if they
34 * wish to delay the data/status stages of the control transfer till they
35 * are ready. The control transfer will then be kept from completing till
36 * all the function drivers that requested for USB_GADGET_DELAYED_STAUS
37 * invoke usb_composite_setup_continue().
38 *
39 * NOTE: USB_GADGET_DELAYED_STATUS must not be used in UDC drivers: they
40 * must delay completing the status stage for 0-length control transfers
41 * regardless of the whether USB_GADGET_DELAYED_STATUS is returned from
42 * the gadget driver's setup() callback.
43 * Currently, a number of UDC drivers rely on USB_GADGET_DELAYED_STATUS,
44 * which is a bug. These drivers must be fixed and USB_GADGET_DELAYED_STATUS
45 * must be contained within the composite framework.
46 */
47 #define USB_GADGET_DELAYED_STATUS 0x7fff /* Impossibly large value */
48
49 /* big enough to hold our biggest descriptor */
50 #define USB_COMP_EP0_BUFSIZ 4096
51
52 /* OS feature descriptor length <= 4kB */
53 #define USB_COMP_EP0_OS_DESC_BUFSIZ 4096
54
55 #define USB_MS_TO_HS_INTERVAL(x) (ilog2((x * 1000 / 125)) + 1)
56 struct usb_configuration;
57
58 /**
59 * struct usb_os_desc_ext_prop - describes one "Extended Property"
60 * @entry: used to keep a list of extended properties
61 * @type: Extended Property type
62 * @name_len: Extended Property unicode name length, including terminating '\0'
63 * @name: Extended Property name
64 * @data_len: Length of Extended Property blob (for unicode store double len)
65 * @data: Extended Property blob
66 * @item: Represents this Extended Property in configfs
67 */
68 struct usb_os_desc_ext_prop {
69 struct list_head entry;
70 u8 type;
71 int name_len;
72 char *name;
73 int data_len;
74 char *data;
75 struct config_item item;
76 };
77
78 /**
79 * struct usb_os_desc - describes OS descriptors associated with one interface
80 * @ext_compat_id: 16 bytes of "Compatible ID" and "Subcompatible ID"
81 * @ext_prop: Extended Properties list
82 * @ext_prop_len: Total length of Extended Properties blobs
83 * @ext_prop_count: Number of Extended Properties
84 * @opts_mutex: Optional mutex protecting config data of a usb_function_instance
85 * @group: Represents OS descriptors associated with an interface in configfs
86 * @owner: Module associated with this OS descriptor
87 */
88 struct usb_os_desc {
89 char *ext_compat_id;
90 struct list_head ext_prop;
91 int ext_prop_len;
92 int ext_prop_count;
93 struct mutex *opts_mutex;
94 struct config_group group;
95 struct module *owner;
96 };
97
98 /**
99 * struct usb_os_desc_table - describes OS descriptors associated with one
100 * interface of a usb_function
101 * @if_id: Interface id
102 * @os_desc: "Extended Compatibility ID" and "Extended Properties" of the
103 * interface
104 *
105 * Each interface can have at most one "Extended Compatibility ID" and a
106 * number of "Extended Properties".
107 */
108 struct usb_os_desc_table {
109 int if_id;
110 struct usb_os_desc *os_desc;
111 };
112
113 /**
114 * struct usb_function - describes one function of a configuration
115 * @name: For diagnostics, identifies the function.
116 * @strings: tables of strings, keyed by identifiers assigned during bind()
117 * and by language IDs provided in control requests
118 * @fs_descriptors: Table of full (or low) speed descriptors, using interface and
119 * string identifiers assigned during @bind(). If this pointer is null,
120 * the function will not be available at full speed (or at low speed).
121 * @hs_descriptors: Table of high speed descriptors, using interface and
122 * string identifiers assigned during @bind(). If this pointer is null,
123 * the function will not be available at high speed.
124 * @ss_descriptors: Table of super speed descriptors, using interface and
125 * string identifiers assigned during @bind(). If this
126 * pointer is null after initiation, the function will not
127 * be available at super speed.
128 * @ssp_descriptors: Table of super speed plus descriptors, using
129 * interface and string identifiers assigned during @bind(). If
130 * this pointer is null after initiation, the function will not
131 * be available at super speed plus.
132 * @config: assigned when @usb_add_function() is called; this is the
133 * configuration with which this function is associated.
134 * @os_desc_table: Table of (interface id, os descriptors) pairs. The function
135 * can expose more than one interface. If an interface is a member of
136 * an IAD, only the first interface of IAD has its entry in the table.
137 * @os_desc_n: Number of entries in os_desc_table
138 * @bind: Before the gadget can register, all of its functions bind() to the
139 * available resources including string and interface identifiers used
140 * in interface or class descriptors; endpoints; I/O buffers; and so on.
141 * @unbind: Reverses @bind; called as a side effect of unregistering the
142 * driver which added this function.
143 * @free_func: free the struct usb_function.
144 * @mod: (internal) points to the module that created this structure.
145 * @set_alt: (REQUIRED) Reconfigures altsettings; function drivers may
146 * initialize usb_ep.driver data at this time (when it is used).
147 * Note that setting an interface to its current altsetting resets
148 * interface state, and that all interfaces have a disabled state.
149 * @get_alt: Returns the active altsetting. If this is not provided,
150 * then only altsetting zero is supported.
151 * @disable: (REQUIRED) Indicates the function should be disabled. Reasons
152 * include host resetting or reconfiguring the gadget, and disconnection.
153 * @setup: Used for interface-specific control requests.
154 * @req_match: Tests if a given class request can be handled by this function.
155 * @suspend: Notifies functions when the host stops sending USB traffic.
156 * @resume: Notifies functions when the host restarts USB traffic.
157 * @get_status: Returns function status as a reply to
158 * GetStatus() request when the recipient is Interface.
159 * @func_suspend: callback to be called when
160 * SetFeature(FUNCTION_SUSPEND) is reseived
161 * @func_suspended: Indicates whether the function is in function suspend state.
162 * @func_wakeup_armed: Indicates whether the function is armed by the host for
163 * wakeup signaling.
164 *
165 * A single USB function uses one or more interfaces, and should in most
166 * cases support operation at both full and high speeds. Each function is
167 * associated by @usb_add_function() with a one configuration; that function
168 * causes @bind() to be called so resources can be allocated as part of
169 * setting up a gadget driver. Those resources include endpoints, which
170 * should be allocated using @usb_ep_autoconfig().
171 *
172 * To support dual speed operation, a function driver provides descriptors
173 * for both high and full speed operation. Except in rare cases that don't
174 * involve bulk endpoints, each speed needs different endpoint descriptors.
175 *
176 * Function drivers choose their own strategies for managing instance data.
177 * The simplest strategy just declares it "static', which means the function
178 * can only be activated once. If the function needs to be exposed in more
179 * than one configuration at a given speed, it needs to support multiple
180 * usb_function structures (one for each configuration).
181 *
182 * A more complex strategy might encapsulate a @usb_function structure inside
183 * a driver-specific instance structure to allows multiple activations. An
184 * example of multiple activations might be a CDC ACM function that supports
185 * two or more distinct instances within the same configuration, providing
186 * several independent logical data links to a USB host.
187 */
188
189 struct usb_function {
190 const char *name;
191 struct usb_gadget_strings **strings;
192 struct usb_descriptor_header **fs_descriptors;
193 struct usb_descriptor_header **hs_descriptors;
194 struct usb_descriptor_header **ss_descriptors;
195 struct usb_descriptor_header **ssp_descriptors;
196
197 struct usb_configuration *config;
198
199 struct usb_os_desc_table *os_desc_table;
200 unsigned os_desc_n;
201
202 /* REVISIT: bind() functions can be marked __init, which
203 * makes trouble for section mismatch analysis. See if
204 * we can't restructure things to avoid mismatching.
205 * Related: unbind() may kfree() but bind() won't...
206 */
207
208 /* configuration management: bind/unbind */
209 int (*bind)(struct usb_configuration *,
210 struct usb_function *);
211 void (*unbind)(struct usb_configuration *,
212 struct usb_function *);
213 void (*free_func)(struct usb_function *f);
214 struct module *mod;
215
216 /* runtime state management */
217 int (*set_alt)(struct usb_function *,
218 unsigned interface, unsigned alt);
219 int (*get_alt)(struct usb_function *,
220 unsigned interface);
221 void (*disable)(struct usb_function *);
222 int (*setup)(struct usb_function *,
223 const struct usb_ctrlrequest *);
224 bool (*req_match)(struct usb_function *,
225 const struct usb_ctrlrequest *,
226 bool config0);
227 void (*suspend)(struct usb_function *);
228 void (*resume)(struct usb_function *);
229
230 /* USB 3.0 additions */
231 int (*get_status)(struct usb_function *);
232 int (*func_suspend)(struct usb_function *,
233 u8 suspend_opt);
234 bool func_suspended;
235 bool func_wakeup_armed;
236 /* private: */
237 /* internals */
238 struct list_head list;
239 DECLARE_BITMAP(endpoints, 32);
240 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 int usb_func_wakeup(struct usb_function *func);
258
259 #define MAX_CONFIG_INTERFACES 32
260
261 /**
262 * struct usb_configuration - represents one gadget configuration
263 * @label: For diagnostics, describes the configuration.
264 * @strings: Tables of strings, keyed by identifiers assigned during @bind()
265 * and by language IDs provided in control requests.
266 * @descriptors: Table of descriptors preceding all function descriptors.
267 * Examples include OTG and vendor-specific descriptors.
268 * @unbind: Reverses @bind; called as a side effect of unregistering the
269 * driver which added this configuration.
270 * @setup: Used to delegate control requests that aren't handled by standard
271 * device infrastructure or directed at a specific interface.
272 * @bConfigurationValue: Copied into configuration descriptor.
273 * @iConfiguration: Copied into configuration descriptor.
274 * @bmAttributes: Copied into configuration descriptor.
275 * @MaxPower: Power consumption in mA. Used to compute bMaxPower in the
276 * configuration descriptor after considering the bus speed.
277 * @cdev: assigned by @usb_add_config() before calling @bind(); this is
278 * the device associated with this configuration.
279 *
280 * Configurations are building blocks for gadget drivers structured around
281 * function drivers. Simple USB gadgets require only one function and one
282 * configuration, and handle dual-speed hardware by always providing the same
283 * functionality. Slightly more complex gadgets may have more than one
284 * single-function configuration at a given speed; or have configurations
285 * that only work at one speed.
286 *
287 * Composite devices are, by definition, ones with configurations which
288 * include more than one function.
289 *
290 * The lifecycle of a usb_configuration includes allocation, initialization
291 * of the fields described above, and calling @usb_add_config() to set up
292 * internal data and bind it to a specific device. The configuration's
293 * @bind() method is then used to initialize all the functions and then
294 * call @usb_add_function() for them.
295 *
296 * Those functions would normally be independent of each other, but that's
297 * not mandatory. CDC WMC devices are an example where functions often
298 * depend on other functions, with some functions subsidiary to others.
299 * Such interdependency may be managed in any way, so long as all of the
300 * descriptors complete by the time the composite driver returns from
301 * its bind() routine.
302 */
303 struct usb_configuration {
304 const char *label;
305 struct usb_gadget_strings **strings;
306 const struct usb_descriptor_header **descriptors;
307
308 /* REVISIT: bind() functions can be marked __init, which
309 * makes trouble for section mismatch analysis. See if
310 * we can't restructure things to avoid mismatching...
311 */
312
313 /* configuration management: unbind/setup */
314 void (*unbind)(struct usb_configuration *);
315 int (*setup)(struct usb_configuration *,
316 const struct usb_ctrlrequest *);
317
318 /* fields in the config descriptor */
319 u8 bConfigurationValue;
320 u8 iConfiguration;
321 u8 bmAttributes;
322 u16 MaxPower;
323
324 struct usb_composite_dev *cdev;
325
326 /* private: */
327 /* internals */
328 struct list_head list;
329 struct list_head functions;
330 u8 next_interface_id;
331 unsigned superspeed:1;
332 unsigned highspeed:1;
333 unsigned fullspeed:1;
334 unsigned superspeed_plus:1;
335 struct usb_function *interface[MAX_CONFIG_INTERFACES];
336 };
337
338 int usb_add_config(struct usb_composite_dev *,
339 struct usb_configuration *,
340 int (*)(struct usb_configuration *));
341
342 /* predefined index for usb_composite_driver */
343 enum {
344 USB_GADGET_MANUFACTURER_IDX = 0,
345 USB_GADGET_PRODUCT_IDX,
346 USB_GADGET_SERIAL_IDX,
347 USB_GADGET_FIRST_AVAIL_IDX,
348 };
349
350 /**
351 * struct usb_composite_driver - groups configurations into a gadget
352 * @name: For diagnostics, identifies the driver.
353 * @dev: Template descriptor for the device, including default device
354 * identifiers.
355 * @strings: tables of strings, keyed by identifiers assigned during @bind
356 * and language IDs provided in control requests. Note: The first entries
357 * are predefined. The first entry that may be used is
358 * USB_GADGET_FIRST_AVAIL_IDX
359 * @max_speed: Highest speed the driver supports.
360 * @needs_serial: set to 1 if the gadget needs userspace to provide
361 * a serial number. If one is not provided, warning will be printed.
362 * @bind: (REQUIRED) Used to allocate resources that are shared across the
363 * whole device, such as string IDs, and add its configurations using
364 * @usb_add_config(). This may fail by returning a negative errno
365 * value; it should return zero on successful initialization.
366 * @unbind: Reverses @bind; called as a side effect of unregistering
367 * this driver.
368 * @disconnect: optional driver disconnect method
369 * @suspend: Notifies when the host stops sending USB traffic,
370 * after function notifications
371 * @resume: Notifies configuration when the host restarts USB traffic,
372 * before function notifications
373 * @gadget_driver: Gadget driver controlling this driver
374 *
375 * Devices default to reporting self powered operation. Devices which rely
376 * on bus powered operation should report this in their @bind method.
377 *
378 * Before returning from @bind, various fields in the template descriptor
379 * may be overridden. These include the idVendor/idProduct/bcdDevice values
380 * normally to bind the appropriate host side driver, and the three strings
381 * (iManufacturer, iProduct, iSerialNumber) normally used to provide user
382 * meaningful device identifiers. (The strings will not be defined unless
383 * they are defined in @dev and @strings.) The correct ep0 maxpacket size
384 * is also reported, as defined by the underlying controller driver.
385 */
386 struct usb_composite_driver {
387 const char *name;
388 const struct usb_device_descriptor *dev;
389 struct usb_gadget_strings **strings;
390 enum usb_device_speed max_speed;
391 unsigned needs_serial:1;
392
393 int (*bind)(struct usb_composite_dev *cdev);
394 int (*unbind)(struct usb_composite_dev *);
395
396 void (*disconnect)(struct usb_composite_dev *);
397
398 /* global suspend hooks */
399 void (*suspend)(struct usb_composite_dev *);
400 void (*resume)(struct usb_composite_dev *);
401 struct usb_gadget_driver gadget_driver;
402 };
403
404 extern int usb_composite_probe(struct usb_composite_driver *driver);
405 extern void usb_composite_unregister(struct usb_composite_driver *driver);
406
407 /**
408 * module_usb_composite_driver() - Helper macro for registering a USB gadget
409 * composite driver
410 * @__usb_composite_driver: usb_composite_driver struct
411 *
412 * Helper macro for USB gadget composite drivers which do not do anything
413 * special in module init/exit. This eliminates a lot of boilerplate. Each
414 * module may only use this macro once, and calling it replaces module_init()
415 * and module_exit()
416 */
417 #define module_usb_composite_driver(__usb_composite_driver) \
418 module_driver(__usb_composite_driver, usb_composite_probe, \
419 usb_composite_unregister)
420
421 extern void usb_composite_setup_continue(struct usb_composite_dev *cdev);
422 extern int composite_dev_prepare(struct usb_composite_driver *composite,
423 struct usb_composite_dev *cdev);
424 extern int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
425 struct usb_ep *ep0);
426 void composite_dev_cleanup(struct usb_composite_dev *cdev);
427 void check_remote_wakeup_config(struct usb_gadget *g,
428 struct usb_configuration *c);
429
to_cdriver(struct usb_gadget_driver * gdrv)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 * @bcd_webusb_version: 0x0100 by default, WebUSB specification version
449 * @b_webusb_vendor_code: 0x0 by default, vendor code for WebUSB
450 * @landing_page: empty by default, landing page to announce in WebUSB
451 * @use_webusb: false by default, interested gadgets set it
452 * @os_desc_config: the configuration to be used with OS descriptors
453 * @setup_pending: true when setup request is queued but not completed
454 * @os_desc_pending: true when os_desc request is queued but not completed
455 *
456 * One of these devices is allocated and initialized before the
457 * associated device driver's bind() is called.
458 */
459 struct usb_composite_dev {
460 struct usb_gadget *gadget;
461 struct usb_request *req;
462 struct usb_request *os_desc_req;
463
464 struct usb_configuration *config;
465
466 /* OS String is a custom (yet popular) extension to the USB standard. */
467 u8 qw_sign[OS_STRING_QW_SIGN_LEN];
468 u8 b_vendor_code;
469 struct usb_configuration *os_desc_config;
470 unsigned int use_os_string:1;
471
472 /* WebUSB */
473 u16 bcd_webusb_version;
474 u8 b_webusb_vendor_code;
475 char landing_page[WEBUSB_URL_RAW_MAX_LENGTH];
476 unsigned int use_webusb:1;
477
478 /* private: */
479 /* internals */
480 unsigned int suspended:1;
481 struct usb_device_descriptor desc;
482 struct list_head configs;
483 struct list_head gstrings;
484 struct usb_composite_driver *driver;
485 u8 next_string_id;
486 char *def_manufacturer;
487 struct usb_string *usb_strings;
488
489 /* the gadget driver won't enable the data pullup
490 * while the deactivation count is nonzero.
491 */
492 unsigned deactivations;
493
494 /* the composite driver won't complete the control transfer's
495 * data/status stages till delayed_status is zero.
496 */
497 int delayed_status;
498
499 /* protects deactivations and delayed_status counts*/
500 spinlock_t lock;
501
502 /* public: */
503 unsigned int setup_pending:1;
504 unsigned int os_desc_pending:1;
505 };
506
507 extern int usb_string_id(struct usb_composite_dev *c);
508 extern int usb_string_ids_tab(struct usb_composite_dev *c,
509 struct usb_string *str);
510 extern struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
511 struct usb_gadget_strings **sp, unsigned n_strings);
512
513 extern int usb_string_ids_n(struct usb_composite_dev *c, unsigned n);
514
515 extern void composite_disconnect(struct usb_gadget *gadget);
516 extern void composite_reset(struct usb_gadget *gadget);
517
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
get_default_bcdDevice(void)562 static inline u16 get_default_bcdDevice(void)
563 {
564 u16 bcdDevice;
565
566 bcdDevice = bin2bcd(LINUX_VERSION_MAJOR) << 8;
567 bcdDevice |= bin2bcd(LINUX_VERSION_PATCHLEVEL);
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