Commit | Line | Data |
---|---|---|
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. | |
e5760fda DB |
31 | */ |
32 | struct f_loopback { | |
33 | struct usb_function function; | |
34 | ||
35 | struct usb_ep *in_ep; | |
36 | struct usb_ep *out_ep; | |
3e9d992f KO |
37 | |
38 | unsigned qlen; | |
39 | unsigned buflen; | |
e5760fda DB |
40 | }; |
41 | ||
42 | static inline struct f_loopback *func_to_loop(struct usb_function *f) | |
43 | { | |
44 | return container_of(f, struct f_loopback, function); | |
45 | } | |
46 | ||
e5760fda DB |
47 | /*-------------------------------------------------------------------------*/ |
48 | ||
49 | static struct usb_interface_descriptor loopback_intf = { | |
3e9d992f | 50 | .bLength = sizeof(loopback_intf), |
e5760fda DB |
51 | .bDescriptorType = USB_DT_INTERFACE, |
52 | ||
53 | .bNumEndpoints = 2, | |
54 | .bInterfaceClass = USB_CLASS_VENDOR_SPEC, | |
55 | /* .iInterface = DYNAMIC */ | |
56 | }; | |
57 | ||
58 | /* full speed support: */ | |
59 | ||
7e75bc0f | 60 | static struct usb_endpoint_descriptor fs_loop_source_desc = { |
e5760fda DB |
61 | .bLength = USB_DT_ENDPOINT_SIZE, |
62 | .bDescriptorType = USB_DT_ENDPOINT, | |
63 | ||
64 | .bEndpointAddress = USB_DIR_IN, | |
65 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
66 | }; | |
67 | ||
7e75bc0f | 68 | static struct usb_endpoint_descriptor fs_loop_sink_desc = { |
e5760fda DB |
69 | .bLength = USB_DT_ENDPOINT_SIZE, |
70 | .bDescriptorType = USB_DT_ENDPOINT, | |
71 | ||
72 | .bEndpointAddress = USB_DIR_OUT, | |
73 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
74 | }; | |
75 | ||
76 | static struct usb_descriptor_header *fs_loopback_descs[] = { | |
77 | (struct usb_descriptor_header *) &loopback_intf, | |
7e75bc0f DB |
78 | (struct usb_descriptor_header *) &fs_loop_sink_desc, |
79 | (struct usb_descriptor_header *) &fs_loop_source_desc, | |
e5760fda DB |
80 | NULL, |
81 | }; | |
82 | ||
83 | /* high speed support: */ | |
84 | ||
7e75bc0f | 85 | static struct usb_endpoint_descriptor hs_loop_source_desc = { |
e5760fda DB |
86 | .bLength = USB_DT_ENDPOINT_SIZE, |
87 | .bDescriptorType = USB_DT_ENDPOINT, | |
88 | ||
89 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 90 | .wMaxPacketSize = cpu_to_le16(512), |
e5760fda DB |
91 | }; |
92 | ||
7e75bc0f | 93 | static struct usb_endpoint_descriptor hs_loop_sink_desc = { |
e5760fda DB |
94 | .bLength = USB_DT_ENDPOINT_SIZE, |
95 | .bDescriptorType = USB_DT_ENDPOINT, | |
96 | ||
97 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 98 | .wMaxPacketSize = cpu_to_le16(512), |
e5760fda DB |
99 | }; |
100 | ||
101 | static struct usb_descriptor_header *hs_loopback_descs[] = { | |
102 | (struct usb_descriptor_header *) &loopback_intf, | |
7e75bc0f DB |
103 | (struct usb_descriptor_header *) &hs_loop_source_desc, |
104 | (struct usb_descriptor_header *) &hs_loop_sink_desc, | |
e5760fda DB |
105 | NULL, |
106 | }; | |
107 | ||
57c97c02 AB |
108 | /* super speed support: */ |
109 | ||
110 | static struct usb_endpoint_descriptor ss_loop_source_desc = { | |
111 | .bLength = USB_DT_ENDPOINT_SIZE, | |
112 | .bDescriptorType = USB_DT_ENDPOINT, | |
113 | ||
114 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
115 | .wMaxPacketSize = cpu_to_le16(1024), | |
116 | }; | |
117 | ||
8002418d | 118 | static struct usb_ss_ep_comp_descriptor ss_loop_source_comp_desc = { |
57c97c02 AB |
119 | .bLength = USB_DT_SS_EP_COMP_SIZE, |
120 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
121 | .bMaxBurst = 0, | |
122 | .bmAttributes = 0, | |
123 | .wBytesPerInterval = 0, | |
124 | }; | |
125 | ||
126 | static struct usb_endpoint_descriptor ss_loop_sink_desc = { | |
127 | .bLength = USB_DT_ENDPOINT_SIZE, | |
128 | .bDescriptorType = USB_DT_ENDPOINT, | |
129 | ||
130 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
131 | .wMaxPacketSize = cpu_to_le16(1024), | |
132 | }; | |
133 | ||
8002418d | 134 | static struct usb_ss_ep_comp_descriptor ss_loop_sink_comp_desc = { |
57c97c02 AB |
135 | .bLength = USB_DT_SS_EP_COMP_SIZE, |
136 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
137 | .bMaxBurst = 0, | |
138 | .bmAttributes = 0, | |
139 | .wBytesPerInterval = 0, | |
140 | }; | |
141 | ||
142 | static struct usb_descriptor_header *ss_loopback_descs[] = { | |
143 | (struct usb_descriptor_header *) &loopback_intf, | |
144 | (struct usb_descriptor_header *) &ss_loop_source_desc, | |
145 | (struct usb_descriptor_header *) &ss_loop_source_comp_desc, | |
146 | (struct usb_descriptor_header *) &ss_loop_sink_desc, | |
147 | (struct usb_descriptor_header *) &ss_loop_sink_comp_desc, | |
148 | NULL, | |
149 | }; | |
150 | ||
e5760fda DB |
151 | /* function-specific strings: */ |
152 | ||
153 | static struct usb_string strings_loopback[] = { | |
154 | [0].s = "loop input to output", | |
155 | { } /* end of list */ | |
156 | }; | |
157 | ||
158 | static struct usb_gadget_strings stringtab_loop = { | |
159 | .language = 0x0409, /* en-us */ | |
160 | .strings = strings_loopback, | |
161 | }; | |
162 | ||
163 | static struct usb_gadget_strings *loopback_strings[] = { | |
164 | &stringtab_loop, | |
165 | NULL, | |
166 | }; | |
167 | ||
168 | /*-------------------------------------------------------------------------*/ | |
169 | ||
cf9a08ae | 170 | static int loopback_bind(struct usb_configuration *c, struct usb_function *f) |
e5760fda DB |
171 | { |
172 | struct usb_composite_dev *cdev = c->cdev; | |
173 | struct f_loopback *loop = func_to_loop(f); | |
174 | int id; | |
10287bae | 175 | int ret; |
e5760fda DB |
176 | |
177 | /* allocate interface ID(s) */ | |
178 | id = usb_interface_id(c, f); | |
179 | if (id < 0) | |
180 | return id; | |
181 | loopback_intf.bInterfaceNumber = id; | |
182 | ||
78f46f09 SAS |
183 | id = usb_string_id(cdev); |
184 | if (id < 0) | |
185 | return id; | |
186 | strings_loopback[0].id = id; | |
187 | loopback_intf.iInterface = id; | |
188 | ||
e5760fda DB |
189 | /* allocate endpoints */ |
190 | ||
7e75bc0f | 191 | loop->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_source_desc); |
e5760fda DB |
192 | if (!loop->in_ep) { |
193 | autoconf_fail: | |
194 | ERROR(cdev, "%s: can't autoconfigure on %s\n", | |
195 | f->name, cdev->gadget->name); | |
196 | return -ENODEV; | |
197 | } | |
e5760fda | 198 | |
7e75bc0f | 199 | loop->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_sink_desc); |
e5760fda DB |
200 | if (!loop->out_ep) |
201 | goto autoconf_fail; | |
e5760fda DB |
202 | |
203 | /* support high speed hardware */ | |
10287bae SAS |
204 | hs_loop_source_desc.bEndpointAddress = |
205 | fs_loop_source_desc.bEndpointAddress; | |
206 | hs_loop_sink_desc.bEndpointAddress = fs_loop_sink_desc.bEndpointAddress; | |
e5760fda | 207 | |
57c97c02 | 208 | /* support super speed hardware */ |
10287bae SAS |
209 | ss_loop_source_desc.bEndpointAddress = |
210 | fs_loop_source_desc.bEndpointAddress; | |
211 | ss_loop_sink_desc.bEndpointAddress = fs_loop_sink_desc.bEndpointAddress; | |
212 | ||
213 | ret = usb_assign_descriptors(f, fs_loopback_descs, hs_loopback_descs, | |
eaef50c7 | 214 | ss_loopback_descs, NULL); |
10287bae SAS |
215 | if (ret) |
216 | return ret; | |
57c97c02 | 217 | |
e5760fda | 218 | DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n", |
57c97c02 AB |
219 | (gadget_is_superspeed(c->cdev->gadget) ? "super" : |
220 | (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")), | |
e5760fda DB |
221 | f->name, loop->in_ep->name, loop->out_ep->name); |
222 | return 0; | |
223 | } | |
224 | ||
cf9a08ae | 225 | static void lb_free_func(struct usb_function *f) |
e5760fda | 226 | { |
c0501f47 AP |
227 | struct f_lb_opts *opts; |
228 | ||
229 | opts = container_of(f->fi, struct f_lb_opts, func_inst); | |
230 | ||
231 | mutex_lock(&opts->lock); | |
232 | opts->refcnt--; | |
233 | mutex_unlock(&opts->lock); | |
234 | ||
10287bae | 235 | usb_free_all_descriptors(f); |
e5760fda DB |
236 | kfree(func_to_loop(f)); |
237 | } | |
238 | ||
239 | static void loopback_complete(struct usb_ep *ep, struct usb_request *req) | |
240 | { | |
241 | struct f_loopback *loop = ep->driver_data; | |
242 | struct usb_composite_dev *cdev = loop->function.config->cdev; | |
243 | int status = req->status; | |
244 | ||
245 | switch (status) { | |
e5760fda DB |
246 | case 0: /* normal completion? */ |
247 | if (ep == loop->out_ep) { | |
91c42b0d KO |
248 | /* |
249 | * We received some data from the host so let's | |
250 | * queue it so host can read the from our in ep | |
251 | */ | |
252 | struct usb_request *in_req = req->context; | |
253 | ||
254 | in_req->zero = (req->actual < req->length); | |
255 | in_req->length = req->actual; | |
256 | ep = loop->in_ep; | |
257 | req = in_req; | |
258 | } else { | |
259 | /* | |
260 | * We have just looped back a bunch of data | |
261 | * to host. Now let's wait for some more data. | |
262 | */ | |
263 | req = req->context; | |
264 | ep = loop->out_ep; | |
e5760fda DB |
265 | } |
266 | ||
91c42b0d | 267 | /* queue the buffer back to host or for next bunch of data */ |
e0857ce5 | 268 | status = usb_ep_queue(ep, req, GFP_ATOMIC); |
91c42b0d | 269 | if (status == 0) { |
e5760fda | 270 | return; |
91c42b0d KO |
271 | } else { |
272 | ERROR(cdev, "Unable to loop back buffer to %s: %d\n", | |
273 | ep->name, status); | |
274 | goto free_req; | |
275 | } | |
e5760fda DB |
276 | |
277 | /* "should never get here" */ | |
e5760fda DB |
278 | default: |
279 | ERROR(cdev, "%s loop complete --> %d, %d/%d\n", ep->name, | |
280 | status, req->actual, req->length); | |
281 | /* FALLTHROUGH */ | |
282 | ||
283 | /* NOTE: since this driver doesn't maintain an explicit record | |
284 | * of requests it submitted (just maintains qlen count), we | |
285 | * rely on the hardware driver to clean up on disconnect or | |
286 | * endpoint disable. | |
287 | */ | |
288 | case -ECONNABORTED: /* hardware forced ep reset */ | |
289 | case -ECONNRESET: /* request dequeued */ | |
290 | case -ESHUTDOWN: /* disconnect from host */ | |
91c42b0d KO |
291 | free_req: |
292 | usb_ep_free_request(ep == loop->in_ep ? | |
293 | loop->out_ep : loop->in_ep, | |
294 | req->context); | |
e5760fda DB |
295 | free_ep_req(ep, req); |
296 | return; | |
297 | } | |
298 | } | |
299 | ||
300 | static void disable_loopback(struct f_loopback *loop) | |
301 | { | |
302 | struct usb_composite_dev *cdev; | |
303 | ||
304 | cdev = loop->function.config->cdev; | |
2c247804 | 305 | disable_endpoints(cdev, loop->in_ep, loop->out_ep, NULL, NULL); |
e5760fda DB |
306 | VDBG(cdev, "%s disabled\n", loop->function.name); |
307 | } | |
308 | ||
1efd54ea AP |
309 | static inline struct usb_request *lb_alloc_ep_req(struct usb_ep *ep, int len) |
310 | { | |
3e9d992f KO |
311 | struct f_loopback *loop = ep->driver_data; |
312 | ||
313 | return alloc_ep_req(ep, len, loop->buflen); | |
1efd54ea AP |
314 | } |
315 | ||
91c42b0d KO |
316 | static int alloc_requests(struct usb_composite_dev *cdev, |
317 | struct f_loopback *loop) | |
e5760fda | 318 | { |
91c42b0d KO |
319 | struct usb_request *in_req, *out_req; |
320 | int i; | |
321 | int result = 0; | |
e5760fda | 322 | |
e0857ce5 FB |
323 | /* |
324 | * allocate a bunch of read buffers and queue them all at once. | |
91c42b0d KO |
325 | * we buffer at most 'qlen' transfers; We allocate buffers only |
326 | * for out transfer and reuse them in IN transfers to implement | |
327 | * our loopback functionality | |
e5760fda | 328 | */ |
3e9d992f | 329 | for (i = 0; i < loop->qlen && result == 0; i++) { |
91c42b0d KO |
330 | result = -ENOMEM; |
331 | ||
5e216d54 | 332 | in_req = usb_ep_alloc_request(loop->in_ep, GFP_ATOMIC); |
91c42b0d KO |
333 | if (!in_req) |
334 | goto fail; | |
335 | ||
336 | out_req = lb_alloc_ep_req(loop->out_ep, 0); | |
337 | if (!out_req) | |
338 | goto fail_in; | |
339 | ||
340 | in_req->complete = loopback_complete; | |
341 | out_req->complete = loopback_complete; | |
342 | ||
343 | in_req->buf = out_req->buf; | |
344 | /* length will be set in complete routine */ | |
345 | in_req->context = out_req; | |
346 | out_req->context = in_req; | |
e0857ce5 | 347 | |
91c42b0d | 348 | result = usb_ep_queue(loop->out_ep, out_req, GFP_ATOMIC); |
e0857ce5 FB |
349 | if (result) { |
350 | ERROR(cdev, "%s queue req --> %d\n", | |
91c42b0d KO |
351 | loop->out_ep->name, result); |
352 | goto fail_out; | |
e5760fda DB |
353 | } |
354 | } | |
355 | ||
e0857ce5 FB |
356 | return 0; |
357 | ||
91c42b0d KO |
358 | fail_out: |
359 | free_ep_req(loop->out_ep, out_req); | |
360 | fail_in: | |
361 | usb_ep_free_request(loop->in_ep, in_req); | |
362 | fail: | |
363 | return result; | |
364 | } | |
365 | ||
366 | static int enable_endpoint(struct usb_composite_dev *cdev, | |
367 | struct f_loopback *loop, struct usb_ep *ep) | |
368 | { | |
369 | int result; | |
370 | ||
371 | result = config_ep_by_speed(cdev->gadget, &(loop->function), ep); | |
372 | if (result) | |
373 | goto out; | |
e0857ce5 | 374 | |
91c42b0d KO |
375 | result = usb_ep_enable(ep); |
376 | if (result < 0) | |
377 | goto out; | |
378 | ep->driver_data = loop; | |
379 | result = 0; | |
380 | ||
381 | out: | |
e0857ce5 FB |
382 | return result; |
383 | } | |
384 | ||
385 | static int | |
386 | enable_loopback(struct usb_composite_dev *cdev, struct f_loopback *loop) | |
387 | { | |
388 | int result = 0; | |
389 | ||
390 | result = enable_endpoint(cdev, loop, loop->in_ep); | |
391 | if (result) | |
91c42b0d | 392 | goto out; |
e0857ce5 FB |
393 | |
394 | result = enable_endpoint(cdev, loop, loop->out_ep); | |
395 | if (result) | |
91c42b0d KO |
396 | goto disable_in; |
397 | ||
398 | result = alloc_requests(cdev, loop); | |
399 | if (result) | |
400 | goto disable_out; | |
e0857ce5 | 401 | |
e5760fda | 402 | DBG(cdev, "%s enabled\n", loop->function.name); |
91c42b0d KO |
403 | return 0; |
404 | ||
405 | disable_out: | |
406 | usb_ep_disable(loop->out_ep); | |
407 | disable_in: | |
408 | usb_ep_disable(loop->in_ep); | |
409 | out: | |
e5760fda DB |
410 | return result; |
411 | } | |
412 | ||
413 | static int loopback_set_alt(struct usb_function *f, | |
414 | unsigned intf, unsigned alt) | |
415 | { | |
416 | struct f_loopback *loop = func_to_loop(f); | |
417 | struct usb_composite_dev *cdev = f->config->cdev; | |
418 | ||
419 | /* we know alt is zero */ | |
0523ca4e | 420 | disable_loopback(loop); |
e5760fda DB |
421 | return enable_loopback(cdev, loop); |
422 | } | |
423 | ||
424 | static void loopback_disable(struct usb_function *f) | |
425 | { | |
426 | struct f_loopback *loop = func_to_loop(f); | |
427 | ||
428 | disable_loopback(loop); | |
429 | } | |
430 | ||
cf9a08ae | 431 | static struct usb_function *loopback_alloc(struct usb_function_instance *fi) |
e5760fda DB |
432 | { |
433 | struct f_loopback *loop; | |
cf9a08ae | 434 | struct f_lb_opts *lb_opts; |
e5760fda DB |
435 | |
436 | loop = kzalloc(sizeof *loop, GFP_KERNEL); | |
437 | if (!loop) | |
cf9a08ae SAS |
438 | return ERR_PTR(-ENOMEM); |
439 | ||
440 | lb_opts = container_of(fi, struct f_lb_opts, func_inst); | |
c0501f47 AP |
441 | |
442 | mutex_lock(&lb_opts->lock); | |
443 | lb_opts->refcnt++; | |
444 | mutex_unlock(&lb_opts->lock); | |
445 | ||
3e9d992f KO |
446 | loop->buflen = lb_opts->bulk_buflen; |
447 | loop->qlen = lb_opts->qlen; | |
448 | if (!loop->qlen) | |
449 | loop->qlen = 32; | |
e5760fda DB |
450 | |
451 | loop->function.name = "loopback"; | |
e5760fda | 452 | loop->function.bind = loopback_bind; |
e5760fda DB |
453 | loop->function.set_alt = loopback_set_alt; |
454 | loop->function.disable = loopback_disable; | |
cf9a08ae SAS |
455 | loop->function.strings = loopback_strings; |
456 | ||
457 | loop->function.free_func = lb_free_func; | |
458 | ||
459 | return &loop->function; | |
460 | } | |
461 | ||
c0501f47 AP |
462 | static inline struct f_lb_opts *to_f_lb_opts(struct config_item *item) |
463 | { | |
464 | return container_of(to_config_group(item), struct f_lb_opts, | |
465 | func_inst.group); | |
466 | } | |
467 | ||
c0501f47 AP |
468 | static void lb_attr_release(struct config_item *item) |
469 | { | |
470 | struct f_lb_opts *lb_opts = to_f_lb_opts(item); | |
471 | ||
472 | usb_put_function_instance(&lb_opts->func_inst); | |
473 | } | |
474 | ||
475 | static struct configfs_item_operations lb_item_ops = { | |
476 | .release = lb_attr_release, | |
c0501f47 AP |
477 | }; |
478 | ||
75ab2256 | 479 | static ssize_t f_lb_opts_qlen_show(struct config_item *item, char *page) |
c0501f47 | 480 | { |
75ab2256 | 481 | struct f_lb_opts *opts = to_f_lb_opts(item); |
c0501f47 AP |
482 | int result; |
483 | ||
484 | mutex_lock(&opts->lock); | |
902d03c7 | 485 | result = sprintf(page, "%d\n", opts->qlen); |
c0501f47 AP |
486 | mutex_unlock(&opts->lock); |
487 | ||
488 | return result; | |
489 | } | |
490 | ||
75ab2256 | 491 | static ssize_t f_lb_opts_qlen_store(struct config_item *item, |
c0501f47 AP |
492 | const char *page, size_t len) |
493 | { | |
75ab2256 | 494 | struct f_lb_opts *opts = to_f_lb_opts(item); |
c0501f47 AP |
495 | int ret; |
496 | u32 num; | |
497 | ||
498 | mutex_lock(&opts->lock); | |
499 | if (opts->refcnt) { | |
500 | ret = -EBUSY; | |
501 | goto end; | |
502 | } | |
503 | ||
504 | ret = kstrtou32(page, 0, &num); | |
505 | if (ret) | |
506 | goto end; | |
507 | ||
508 | opts->qlen = num; | |
509 | ret = len; | |
510 | end: | |
511 | mutex_unlock(&opts->lock); | |
512 | return ret; | |
513 | } | |
514 | ||
75ab2256 | 515 | CONFIGFS_ATTR(f_lb_opts_, qlen); |
c0501f47 | 516 | |
75ab2256 | 517 | static ssize_t f_lb_opts_bulk_buflen_show(struct config_item *item, char *page) |
c0501f47 | 518 | { |
75ab2256 | 519 | struct f_lb_opts *opts = to_f_lb_opts(item); |
c0501f47 AP |
520 | int result; |
521 | ||
522 | mutex_lock(&opts->lock); | |
902d03c7 | 523 | result = sprintf(page, "%d\n", opts->bulk_buflen); |
c0501f47 AP |
524 | mutex_unlock(&opts->lock); |
525 | ||
526 | return result; | |
527 | } | |
528 | ||
75ab2256 | 529 | static ssize_t f_lb_opts_bulk_buflen_store(struct config_item *item, |
c0501f47 AP |
530 | const char *page, size_t len) |
531 | { | |
75ab2256 | 532 | struct f_lb_opts *opts = to_f_lb_opts(item); |
c0501f47 AP |
533 | int ret; |
534 | u32 num; | |
535 | ||
536 | mutex_lock(&opts->lock); | |
537 | if (opts->refcnt) { | |
538 | ret = -EBUSY; | |
539 | goto end; | |
540 | } | |
541 | ||
542 | ret = kstrtou32(page, 0, &num); | |
543 | if (ret) | |
544 | goto end; | |
545 | ||
546 | opts->bulk_buflen = num; | |
547 | ret = len; | |
548 | end: | |
549 | mutex_unlock(&opts->lock); | |
550 | return ret; | |
551 | } | |
552 | ||
75ab2256 | 553 | CONFIGFS_ATTR(f_lb_opts_, bulk_buflen); |
c0501f47 AP |
554 | |
555 | static struct configfs_attribute *lb_attrs[] = { | |
75ab2256 CH |
556 | &f_lb_opts_attr_qlen, |
557 | &f_lb_opts_attr_bulk_buflen, | |
c0501f47 AP |
558 | NULL, |
559 | }; | |
560 | ||
561 | static struct config_item_type lb_func_type = { | |
562 | .ct_item_ops = &lb_item_ops, | |
563 | .ct_attrs = lb_attrs, | |
564 | .ct_owner = THIS_MODULE, | |
565 | }; | |
566 | ||
cf9a08ae SAS |
567 | static void lb_free_instance(struct usb_function_instance *fi) |
568 | { | |
569 | struct f_lb_opts *lb_opts; | |
e5760fda | 570 | |
cf9a08ae SAS |
571 | lb_opts = container_of(fi, struct f_lb_opts, func_inst); |
572 | kfree(lb_opts); | |
e5760fda | 573 | } |
cf9a08ae SAS |
574 | |
575 | static struct usb_function_instance *loopback_alloc_instance(void) | |
576 | { | |
577 | struct f_lb_opts *lb_opts; | |
578 | ||
579 | lb_opts = kzalloc(sizeof(*lb_opts), GFP_KERNEL); | |
580 | if (!lb_opts) | |
581 | return ERR_PTR(-ENOMEM); | |
c0501f47 | 582 | mutex_init(&lb_opts->lock); |
cf9a08ae | 583 | lb_opts->func_inst.free_func_inst = lb_free_instance; |
c0501f47 AP |
584 | lb_opts->bulk_buflen = GZERO_BULK_BUFLEN; |
585 | lb_opts->qlen = GZERO_QLEN; | |
586 | ||
587 | config_group_init_type_name(&lb_opts->func_inst.group, "", | |
588 | &lb_func_type); | |
589 | ||
cf9a08ae SAS |
590 | return &lb_opts->func_inst; |
591 | } | |
592 | DECLARE_USB_FUNCTION(Loopback, loopback_alloc_instance, loopback_alloc); | |
593 | ||
594 | int __init lb_modinit(void) | |
595 | { | |
596 | int ret; | |
597 | ||
598 | ret = usb_function_register(&Loopbackusb_func); | |
599 | if (ret) | |
600 | return ret; | |
601 | return ret; | |
602 | } | |
603 | void __exit lb_modexit(void) | |
604 | { | |
605 | usb_function_unregister(&Loopbackusb_func); | |
606 | } | |
607 | ||
608 | MODULE_LICENSE("GPL"); |