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e5760fda DB |
1 | /* |
2 | * f_loopback.c - USB peripheral loopback configuration driver | |
3 | * | |
4 | * Copyright (C) 2003-2008 David Brownell | |
5 | * Copyright (C) 2008 by Nokia Corporation | |
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. | |
e5760fda DB |
11 | */ |
12 | ||
13 | /* #define VERBOSE_DEBUG */ | |
14 | ||
5a0e3ad6 | 15 | #include <linux/slab.h> |
e5760fda | 16 | #include <linux/kernel.h> |
e5760fda | 17 | #include <linux/device.h> |
cf9a08ae SAS |
18 | #include <linux/module.h> |
19 | #include <linux/err.h> | |
20 | #include <linux/usb/composite.h> | |
e5760fda DB |
21 | |
22 | #include "g_zero.h" | |
1efd54ea | 23 | #include "u_f.h" |
e5760fda DB |
24 | |
25 | /* | |
26 | * LOOPBACK FUNCTION ... a testing vehicle for USB peripherals, | |
27 | * | |
28 | * This takes messages of various sizes written OUT to a device, and loops | |
29 | * them back so they can be read IN from it. It has been used by certain | |
30 | * test applications. It supports limited testing of data queueing logic. | |
31 | * | |
32 | * | |
33 | * This is currently packaged as a configuration driver, which can't be | |
34 | * combined with other functions to make composite devices. However, it | |
35 | * can be combined with other independent configurations. | |
36 | */ | |
37 | struct f_loopback { | |
38 | struct usb_function function; | |
39 | ||
40 | struct usb_ep *in_ep; | |
41 | struct usb_ep *out_ep; | |
42 | }; | |
43 | ||
44 | static inline struct f_loopback *func_to_loop(struct usb_function *f) | |
45 | { | |
46 | return container_of(f, struct f_loopback, function); | |
47 | } | |
48 | ||
cf9a08ae SAS |
49 | static unsigned qlen; |
50 | static unsigned buflen; | |
e5760fda DB |
51 | |
52 | /*-------------------------------------------------------------------------*/ | |
53 | ||
54 | static struct usb_interface_descriptor loopback_intf = { | |
55 | .bLength = sizeof loopback_intf, | |
56 | .bDescriptorType = USB_DT_INTERFACE, | |
57 | ||
58 | .bNumEndpoints = 2, | |
59 | .bInterfaceClass = USB_CLASS_VENDOR_SPEC, | |
60 | /* .iInterface = DYNAMIC */ | |
61 | }; | |
62 | ||
63 | /* full speed support: */ | |
64 | ||
7e75bc0f | 65 | static struct usb_endpoint_descriptor fs_loop_source_desc = { |
e5760fda DB |
66 | .bLength = USB_DT_ENDPOINT_SIZE, |
67 | .bDescriptorType = USB_DT_ENDPOINT, | |
68 | ||
69 | .bEndpointAddress = USB_DIR_IN, | |
70 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
71 | }; | |
72 | ||
7e75bc0f | 73 | static struct usb_endpoint_descriptor fs_loop_sink_desc = { |
e5760fda DB |
74 | .bLength = USB_DT_ENDPOINT_SIZE, |
75 | .bDescriptorType = USB_DT_ENDPOINT, | |
76 | ||
77 | .bEndpointAddress = USB_DIR_OUT, | |
78 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
79 | }; | |
80 | ||
81 | static struct usb_descriptor_header *fs_loopback_descs[] = { | |
82 | (struct usb_descriptor_header *) &loopback_intf, | |
7e75bc0f DB |
83 | (struct usb_descriptor_header *) &fs_loop_sink_desc, |
84 | (struct usb_descriptor_header *) &fs_loop_source_desc, | |
e5760fda DB |
85 | NULL, |
86 | }; | |
87 | ||
88 | /* high speed support: */ | |
89 | ||
7e75bc0f | 90 | static struct usb_endpoint_descriptor hs_loop_source_desc = { |
e5760fda DB |
91 | .bLength = USB_DT_ENDPOINT_SIZE, |
92 | .bDescriptorType = USB_DT_ENDPOINT, | |
93 | ||
94 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 95 | .wMaxPacketSize = cpu_to_le16(512), |
e5760fda DB |
96 | }; |
97 | ||
7e75bc0f | 98 | static struct usb_endpoint_descriptor hs_loop_sink_desc = { |
e5760fda DB |
99 | .bLength = USB_DT_ENDPOINT_SIZE, |
100 | .bDescriptorType = USB_DT_ENDPOINT, | |
101 | ||
102 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 103 | .wMaxPacketSize = cpu_to_le16(512), |
e5760fda DB |
104 | }; |
105 | ||
106 | static struct usb_descriptor_header *hs_loopback_descs[] = { | |
107 | (struct usb_descriptor_header *) &loopback_intf, | |
7e75bc0f DB |
108 | (struct usb_descriptor_header *) &hs_loop_source_desc, |
109 | (struct usb_descriptor_header *) &hs_loop_sink_desc, | |
e5760fda DB |
110 | NULL, |
111 | }; | |
112 | ||
57c97c02 AB |
113 | /* super speed support: */ |
114 | ||
115 | static struct usb_endpoint_descriptor ss_loop_source_desc = { | |
116 | .bLength = USB_DT_ENDPOINT_SIZE, | |
117 | .bDescriptorType = USB_DT_ENDPOINT, | |
118 | ||
119 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
120 | .wMaxPacketSize = cpu_to_le16(1024), | |
121 | }; | |
122 | ||
8002418d | 123 | static struct usb_ss_ep_comp_descriptor ss_loop_source_comp_desc = { |
57c97c02 AB |
124 | .bLength = USB_DT_SS_EP_COMP_SIZE, |
125 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
126 | .bMaxBurst = 0, | |
127 | .bmAttributes = 0, | |
128 | .wBytesPerInterval = 0, | |
129 | }; | |
130 | ||
131 | static struct usb_endpoint_descriptor ss_loop_sink_desc = { | |
132 | .bLength = USB_DT_ENDPOINT_SIZE, | |
133 | .bDescriptorType = USB_DT_ENDPOINT, | |
134 | ||
135 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
136 | .wMaxPacketSize = cpu_to_le16(1024), | |
137 | }; | |
138 | ||
8002418d | 139 | static struct usb_ss_ep_comp_descriptor ss_loop_sink_comp_desc = { |
57c97c02 AB |
140 | .bLength = USB_DT_SS_EP_COMP_SIZE, |
141 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
142 | .bMaxBurst = 0, | |
143 | .bmAttributes = 0, | |
144 | .wBytesPerInterval = 0, | |
145 | }; | |
146 | ||
147 | static struct usb_descriptor_header *ss_loopback_descs[] = { | |
148 | (struct usb_descriptor_header *) &loopback_intf, | |
149 | (struct usb_descriptor_header *) &ss_loop_source_desc, | |
150 | (struct usb_descriptor_header *) &ss_loop_source_comp_desc, | |
151 | (struct usb_descriptor_header *) &ss_loop_sink_desc, | |
152 | (struct usb_descriptor_header *) &ss_loop_sink_comp_desc, | |
153 | NULL, | |
154 | }; | |
155 | ||
e5760fda DB |
156 | /* function-specific strings: */ |
157 | ||
158 | static struct usb_string strings_loopback[] = { | |
159 | [0].s = "loop input to output", | |
160 | { } /* end of list */ | |
161 | }; | |
162 | ||
163 | static struct usb_gadget_strings stringtab_loop = { | |
164 | .language = 0x0409, /* en-us */ | |
165 | .strings = strings_loopback, | |
166 | }; | |
167 | ||
168 | static struct usb_gadget_strings *loopback_strings[] = { | |
169 | &stringtab_loop, | |
170 | NULL, | |
171 | }; | |
172 | ||
173 | /*-------------------------------------------------------------------------*/ | |
174 | ||
cf9a08ae | 175 | static int loopback_bind(struct usb_configuration *c, struct usb_function *f) |
e5760fda DB |
176 | { |
177 | struct usb_composite_dev *cdev = c->cdev; | |
178 | struct f_loopback *loop = func_to_loop(f); | |
179 | int id; | |
10287bae | 180 | int ret; |
e5760fda DB |
181 | |
182 | /* allocate interface ID(s) */ | |
183 | id = usb_interface_id(c, f); | |
184 | if (id < 0) | |
185 | return id; | |
186 | loopback_intf.bInterfaceNumber = id; | |
187 | ||
78f46f09 SAS |
188 | id = usb_string_id(cdev); |
189 | if (id < 0) | |
190 | return id; | |
191 | strings_loopback[0].id = id; | |
192 | loopback_intf.iInterface = id; | |
193 | ||
e5760fda DB |
194 | /* allocate endpoints */ |
195 | ||
7e75bc0f | 196 | loop->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_source_desc); |
e5760fda DB |
197 | if (!loop->in_ep) { |
198 | autoconf_fail: | |
199 | ERROR(cdev, "%s: can't autoconfigure on %s\n", | |
200 | f->name, cdev->gadget->name); | |
201 | return -ENODEV; | |
202 | } | |
203 | loop->in_ep->driver_data = cdev; /* claim */ | |
204 | ||
7e75bc0f | 205 | loop->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_sink_desc); |
e5760fda DB |
206 | if (!loop->out_ep) |
207 | goto autoconf_fail; | |
208 | loop->out_ep->driver_data = cdev; /* claim */ | |
209 | ||
210 | /* support high speed hardware */ | |
10287bae SAS |
211 | hs_loop_source_desc.bEndpointAddress = |
212 | fs_loop_source_desc.bEndpointAddress; | |
213 | hs_loop_sink_desc.bEndpointAddress = fs_loop_sink_desc.bEndpointAddress; | |
e5760fda | 214 | |
57c97c02 | 215 | /* support super speed hardware */ |
10287bae SAS |
216 | ss_loop_source_desc.bEndpointAddress = |
217 | fs_loop_source_desc.bEndpointAddress; | |
218 | ss_loop_sink_desc.bEndpointAddress = fs_loop_sink_desc.bEndpointAddress; | |
219 | ||
220 | ret = usb_assign_descriptors(f, fs_loopback_descs, hs_loopback_descs, | |
221 | ss_loopback_descs); | |
222 | if (ret) | |
223 | return ret; | |
57c97c02 | 224 | |
e5760fda | 225 | DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n", |
57c97c02 AB |
226 | (gadget_is_superspeed(c->cdev->gadget) ? "super" : |
227 | (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")), | |
e5760fda DB |
228 | f->name, loop->in_ep->name, loop->out_ep->name); |
229 | return 0; | |
230 | } | |
231 | ||
cf9a08ae | 232 | static void lb_free_func(struct usb_function *f) |
e5760fda | 233 | { |
c0501f47 AP |
234 | struct f_lb_opts *opts; |
235 | ||
236 | opts = container_of(f->fi, struct f_lb_opts, func_inst); | |
237 | ||
238 | mutex_lock(&opts->lock); | |
239 | opts->refcnt--; | |
240 | mutex_unlock(&opts->lock); | |
241 | ||
10287bae | 242 | usb_free_all_descriptors(f); |
e5760fda DB |
243 | kfree(func_to_loop(f)); |
244 | } | |
245 | ||
246 | static void loopback_complete(struct usb_ep *ep, struct usb_request *req) | |
247 | { | |
248 | struct f_loopback *loop = ep->driver_data; | |
249 | struct usb_composite_dev *cdev = loop->function.config->cdev; | |
250 | int status = req->status; | |
251 | ||
252 | switch (status) { | |
253 | ||
254 | case 0: /* normal completion? */ | |
255 | if (ep == loop->out_ep) { | |
e5760fda DB |
256 | req->zero = (req->actual < req->length); |
257 | req->length = req->actual; | |
e5760fda DB |
258 | } |
259 | ||
260 | /* queue the buffer for some later OUT packet */ | |
261 | req->length = buflen; | |
e0857ce5 | 262 | status = usb_ep_queue(ep, req, GFP_ATOMIC); |
e5760fda DB |
263 | if (status == 0) |
264 | return; | |
265 | ||
266 | /* "should never get here" */ | |
267 | /* FALLTHROUGH */ | |
268 | ||
269 | default: | |
270 | ERROR(cdev, "%s loop complete --> %d, %d/%d\n", ep->name, | |
271 | status, req->actual, req->length); | |
272 | /* FALLTHROUGH */ | |
273 | ||
274 | /* NOTE: since this driver doesn't maintain an explicit record | |
275 | * of requests it submitted (just maintains qlen count), we | |
276 | * rely on the hardware driver to clean up on disconnect or | |
277 | * endpoint disable. | |
278 | */ | |
279 | case -ECONNABORTED: /* hardware forced ep reset */ | |
280 | case -ECONNRESET: /* request dequeued */ | |
281 | case -ESHUTDOWN: /* disconnect from host */ | |
282 | free_ep_req(ep, req); | |
283 | return; | |
284 | } | |
285 | } | |
286 | ||
287 | static void disable_loopback(struct f_loopback *loop) | |
288 | { | |
289 | struct usb_composite_dev *cdev; | |
290 | ||
291 | cdev = loop->function.config->cdev; | |
ef11982d AV |
292 | disable_endpoints(cdev, loop->in_ep, loop->out_ep, NULL, NULL, NULL, |
293 | NULL); | |
e5760fda DB |
294 | VDBG(cdev, "%s disabled\n", loop->function.name); |
295 | } | |
296 | ||
1efd54ea AP |
297 | static inline struct usb_request *lb_alloc_ep_req(struct usb_ep *ep, int len) |
298 | { | |
299 | return alloc_ep_req(ep, len, buflen); | |
300 | } | |
301 | ||
e0857ce5 FB |
302 | static int enable_endpoint(struct usb_composite_dev *cdev, struct f_loopback *loop, |
303 | struct usb_ep *ep) | |
e5760fda | 304 | { |
e5760fda DB |
305 | struct usb_request *req; |
306 | unsigned i; | |
e0857ce5 | 307 | int result; |
e5760fda | 308 | |
e0857ce5 FB |
309 | /* |
310 | * one endpoint writes data back IN to the host while another endpoint | |
311 | * just reads OUT packets | |
312 | */ | |
ea2a1df7 TB |
313 | result = config_ep_by_speed(cdev->gadget, &(loop->function), ep); |
314 | if (result) | |
e0857ce5 | 315 | goto fail0; |
72c973dd | 316 | result = usb_ep_enable(ep); |
e5760fda | 317 | if (result < 0) |
ea2a1df7 | 318 | goto fail0; |
e5760fda DB |
319 | ep->driver_data = loop; |
320 | ||
e0857ce5 FB |
321 | /* |
322 | * allocate a bunch of read buffers and queue them all at once. | |
e5760fda DB |
323 | * we buffer at most 'qlen' transfers; fewer if any need more |
324 | * than 'buflen' bytes each. | |
325 | */ | |
326 | for (i = 0; i < qlen && result == 0; i++) { | |
1efd54ea | 327 | req = lb_alloc_ep_req(ep, 0); |
e0857ce5 FB |
328 | if (!req) |
329 | goto fail1; | |
330 | ||
331 | req->complete = loopback_complete; | |
332 | result = usb_ep_queue(ep, req, GFP_ATOMIC); | |
333 | if (result) { | |
334 | ERROR(cdev, "%s queue req --> %d\n", | |
335 | ep->name, result); | |
336 | goto fail1; | |
e5760fda DB |
337 | } |
338 | } | |
339 | ||
e0857ce5 FB |
340 | return 0; |
341 | ||
342 | fail1: | |
343 | usb_ep_disable(ep); | |
344 | ||
345 | fail0: | |
346 | return result; | |
347 | } | |
348 | ||
349 | static int | |
350 | enable_loopback(struct usb_composite_dev *cdev, struct f_loopback *loop) | |
351 | { | |
352 | int result = 0; | |
353 | ||
354 | result = enable_endpoint(cdev, loop, loop->in_ep); | |
355 | if (result) | |
356 | return result; | |
357 | ||
358 | result = enable_endpoint(cdev, loop, loop->out_ep); | |
359 | if (result) | |
360 | return result; | |
361 | ||
e5760fda DB |
362 | DBG(cdev, "%s enabled\n", loop->function.name); |
363 | return result; | |
364 | } | |
365 | ||
366 | static int loopback_set_alt(struct usb_function *f, | |
367 | unsigned intf, unsigned alt) | |
368 | { | |
369 | struct f_loopback *loop = func_to_loop(f); | |
370 | struct usb_composite_dev *cdev = f->config->cdev; | |
371 | ||
372 | /* we know alt is zero */ | |
373 | if (loop->in_ep->driver_data) | |
374 | disable_loopback(loop); | |
375 | return enable_loopback(cdev, loop); | |
376 | } | |
377 | ||
378 | static void loopback_disable(struct usb_function *f) | |
379 | { | |
380 | struct f_loopback *loop = func_to_loop(f); | |
381 | ||
382 | disable_loopback(loop); | |
383 | } | |
384 | ||
cf9a08ae | 385 | static struct usb_function *loopback_alloc(struct usb_function_instance *fi) |
e5760fda DB |
386 | { |
387 | struct f_loopback *loop; | |
cf9a08ae | 388 | struct f_lb_opts *lb_opts; |
e5760fda DB |
389 | |
390 | loop = kzalloc(sizeof *loop, GFP_KERNEL); | |
391 | if (!loop) | |
cf9a08ae SAS |
392 | return ERR_PTR(-ENOMEM); |
393 | ||
394 | lb_opts = container_of(fi, struct f_lb_opts, func_inst); | |
c0501f47 AP |
395 | |
396 | mutex_lock(&lb_opts->lock); | |
397 | lb_opts->refcnt++; | |
398 | mutex_unlock(&lb_opts->lock); | |
399 | ||
cf9a08ae SAS |
400 | buflen = lb_opts->bulk_buflen; |
401 | qlen = lb_opts->qlen; | |
402 | if (!qlen) | |
403 | qlen = 32; | |
e5760fda DB |
404 | |
405 | loop->function.name = "loopback"; | |
e5760fda | 406 | loop->function.bind = loopback_bind; |
e5760fda DB |
407 | loop->function.set_alt = loopback_set_alt; |
408 | loop->function.disable = loopback_disable; | |
cf9a08ae SAS |
409 | loop->function.strings = loopback_strings; |
410 | ||
411 | loop->function.free_func = lb_free_func; | |
412 | ||
413 | return &loop->function; | |
414 | } | |
415 | ||
c0501f47 AP |
416 | static inline struct f_lb_opts *to_f_lb_opts(struct config_item *item) |
417 | { | |
418 | return container_of(to_config_group(item), struct f_lb_opts, | |
419 | func_inst.group); | |
420 | } | |
421 | ||
422 | CONFIGFS_ATTR_STRUCT(f_lb_opts); | |
423 | CONFIGFS_ATTR_OPS(f_lb_opts); | |
424 | ||
425 | static void lb_attr_release(struct config_item *item) | |
426 | { | |
427 | struct f_lb_opts *lb_opts = to_f_lb_opts(item); | |
428 | ||
429 | usb_put_function_instance(&lb_opts->func_inst); | |
430 | } | |
431 | ||
432 | static struct configfs_item_operations lb_item_ops = { | |
433 | .release = lb_attr_release, | |
434 | .show_attribute = f_lb_opts_attr_show, | |
435 | .store_attribute = f_lb_opts_attr_store, | |
436 | }; | |
437 | ||
438 | static ssize_t f_lb_opts_qlen_show(struct f_lb_opts *opts, char *page) | |
439 | { | |
440 | int result; | |
441 | ||
442 | mutex_lock(&opts->lock); | |
443 | result = sprintf(page, "%d", opts->qlen); | |
444 | mutex_unlock(&opts->lock); | |
445 | ||
446 | return result; | |
447 | } | |
448 | ||
449 | static ssize_t f_lb_opts_qlen_store(struct f_lb_opts *opts, | |
450 | const char *page, size_t len) | |
451 | { | |
452 | int ret; | |
453 | u32 num; | |
454 | ||
455 | mutex_lock(&opts->lock); | |
456 | if (opts->refcnt) { | |
457 | ret = -EBUSY; | |
458 | goto end; | |
459 | } | |
460 | ||
461 | ret = kstrtou32(page, 0, &num); | |
462 | if (ret) | |
463 | goto end; | |
464 | ||
465 | opts->qlen = num; | |
466 | ret = len; | |
467 | end: | |
468 | mutex_unlock(&opts->lock); | |
469 | return ret; | |
470 | } | |
471 | ||
472 | static struct f_lb_opts_attribute f_lb_opts_qlen = | |
473 | __CONFIGFS_ATTR(qlen, S_IRUGO | S_IWUSR, | |
474 | f_lb_opts_qlen_show, | |
475 | f_lb_opts_qlen_store); | |
476 | ||
477 | static ssize_t f_lb_opts_bulk_buflen_show(struct f_lb_opts *opts, char *page) | |
478 | { | |
479 | int result; | |
480 | ||
481 | mutex_lock(&opts->lock); | |
482 | result = sprintf(page, "%d", opts->bulk_buflen); | |
483 | mutex_unlock(&opts->lock); | |
484 | ||
485 | return result; | |
486 | } | |
487 | ||
488 | static ssize_t f_lb_opts_bulk_buflen_store(struct f_lb_opts *opts, | |
489 | const char *page, size_t len) | |
490 | { | |
491 | int ret; | |
492 | u32 num; | |
493 | ||
494 | mutex_lock(&opts->lock); | |
495 | if (opts->refcnt) { | |
496 | ret = -EBUSY; | |
497 | goto end; | |
498 | } | |
499 | ||
500 | ret = kstrtou32(page, 0, &num); | |
501 | if (ret) | |
502 | goto end; | |
503 | ||
504 | opts->bulk_buflen = num; | |
505 | ret = len; | |
506 | end: | |
507 | mutex_unlock(&opts->lock); | |
508 | return ret; | |
509 | } | |
510 | ||
511 | static struct f_lb_opts_attribute f_lb_opts_bulk_buflen = | |
512 | __CONFIGFS_ATTR(buflen, S_IRUGO | S_IWUSR, | |
513 | f_lb_opts_bulk_buflen_show, | |
514 | f_lb_opts_bulk_buflen_store); | |
515 | ||
516 | static struct configfs_attribute *lb_attrs[] = { | |
517 | &f_lb_opts_qlen.attr, | |
518 | &f_lb_opts_bulk_buflen.attr, | |
519 | NULL, | |
520 | }; | |
521 | ||
522 | static struct config_item_type lb_func_type = { | |
523 | .ct_item_ops = &lb_item_ops, | |
524 | .ct_attrs = lb_attrs, | |
525 | .ct_owner = THIS_MODULE, | |
526 | }; | |
527 | ||
cf9a08ae SAS |
528 | static void lb_free_instance(struct usb_function_instance *fi) |
529 | { | |
530 | struct f_lb_opts *lb_opts; | |
e5760fda | 531 | |
cf9a08ae SAS |
532 | lb_opts = container_of(fi, struct f_lb_opts, func_inst); |
533 | kfree(lb_opts); | |
e5760fda | 534 | } |
cf9a08ae SAS |
535 | |
536 | static struct usb_function_instance *loopback_alloc_instance(void) | |
537 | { | |
538 | struct f_lb_opts *lb_opts; | |
539 | ||
540 | lb_opts = kzalloc(sizeof(*lb_opts), GFP_KERNEL); | |
541 | if (!lb_opts) | |
542 | return ERR_PTR(-ENOMEM); | |
c0501f47 | 543 | mutex_init(&lb_opts->lock); |
cf9a08ae | 544 | lb_opts->func_inst.free_func_inst = lb_free_instance; |
c0501f47 AP |
545 | lb_opts->bulk_buflen = GZERO_BULK_BUFLEN; |
546 | lb_opts->qlen = GZERO_QLEN; | |
547 | ||
548 | config_group_init_type_name(&lb_opts->func_inst.group, "", | |
549 | &lb_func_type); | |
550 | ||
cf9a08ae SAS |
551 | return &lb_opts->func_inst; |
552 | } | |
553 | DECLARE_USB_FUNCTION(Loopback, loopback_alloc_instance, loopback_alloc); | |
554 | ||
555 | int __init lb_modinit(void) | |
556 | { | |
557 | int ret; | |
558 | ||
559 | ret = usb_function_register(&Loopbackusb_func); | |
560 | if (ret) | |
561 | return ret; | |
562 | return ret; | |
563 | } | |
564 | void __exit lb_modexit(void) | |
565 | { | |
566 | usb_function_unregister(&Loopbackusb_func); | |
567 | } | |
568 | ||
569 | MODULE_LICENSE("GPL"); |