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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / usb / gadget / configfs.c
bloba5ca409dc97e1cf381e73968d5e5df652313609a
1 #include <linux/configfs.h>
2 #include <linux/module.h>
3 #include <linux/slab.h>
4 #include <linux/device.h>
5 #include <linux/nls.h>
6 #include <linux/usb/composite.h>
7 #include <linux/usb/gadget_configfs.h>
8 #include "configfs.h"
9 #include "u_f.h"
10 #include "u_os_desc.h"
11
12 int check_user_usb_string(const char *name,
13 struct usb_gadget_strings *stringtab_dev)
14 {
15 unsigned primary_lang;
16 unsigned sub_lang;
17 u16 num;
18 int ret;
19
20 ret = kstrtou16(name, 0, &num);
21 if (ret)
22 return ret;
23
24 primary_lang = num & 0x3ff;
25 sub_lang = num >> 10;
26
27 /* simple sanity check for valid langid */
28 switch (primary_lang) {
29 case 0:
30 case 0x62 ... 0xfe:
31 case 0x100 ... 0x3ff:
32 return -EINVAL;
33 }
34 if (!sub_lang)
35 return -EINVAL;
36
37 stringtab_dev->language = num;
38 return 0;
39 }
40
41 #define MAX_NAME_LEN 40
42 #define MAX_USB_STRING_LANGS 2
43
44 static const struct usb_descriptor_header *otg_desc[2];
45
46 struct gadget_info {
47 struct config_group group;
48 struct config_group functions_group;
49 struct config_group configs_group;
50 struct config_group strings_group;
51 struct config_group os_desc_group;
52
53 struct mutex lock;
54 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
55 struct list_head string_list;
56 struct list_head available_func;
57
58 struct usb_composite_driver composite;
59 struct usb_composite_dev cdev;
60 bool use_os_desc;
61 char b_vendor_code;
62 char qw_sign[OS_STRING_QW_SIGN_LEN];
63 };
64
65 static inline struct gadget_info *to_gadget_info(struct config_item *item)
66 {
67 return container_of(to_config_group(item), struct gadget_info, group);
68 }
69
70 struct config_usb_cfg {
71 struct config_group group;
72 struct config_group strings_group;
73 struct list_head string_list;
74 struct usb_configuration c;
75 struct list_head func_list;
76 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
77 };
78
79 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
80 {
81 return container_of(to_config_group(item), struct config_usb_cfg,
82 group);
83 }
84
85 struct gadget_strings {
86 struct usb_gadget_strings stringtab_dev;
87 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
88 char *manufacturer;
89 char *product;
90 char *serialnumber;
91
92 struct config_group group;
93 struct list_head list;
94 };
95
96 struct os_desc {
97 struct config_group group;
98 };
99
100 struct gadget_config_name {
101 struct usb_gadget_strings stringtab_dev;
102 struct usb_string strings;
103 char *configuration;
104
105 struct config_group group;
106 struct list_head list;
107 };
108
109 static int usb_string_copy(const char *s, char **s_copy)
110 {
111 int ret;
112 char *str;
113 char *copy = *s_copy;
114 ret = strlen(s);
115 if (ret > 126)
116 return -EOVERFLOW;
117
118 str = kstrdup(s, GFP_KERNEL);
119 if (!str)
120 return -ENOMEM;
121 if (str[ret - 1] == '\n')
122 str[ret - 1] = '\0';
123 kfree(copy);
124 *s_copy = str;
125 return 0;
126 }
127
128 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
129 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
130 char *page) \
131 { \
132 return sprintf(page, "0x%02x\n", \
133 to_gadget_info(item)->cdev.desc.__name); \
134 }
135
136 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
137 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
138 char *page) \
139 { \
140 return sprintf(page, "0x%04x\n", \
141 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
142 }
143
144
145 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
146 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
147 const char *page, size_t len) \
148 { \
149 u8 val; \
150 int ret; \
151 ret = kstrtou8(page, 0, &val); \
152 if (ret) \
153 return ret; \
154 to_gadget_info(item)->cdev.desc._name = val; \
155 return len; \
156 }
157
158 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
159 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
160 const char *page, size_t len) \
161 { \
162 u16 val; \
163 int ret; \
164 ret = kstrtou16(page, 0, &val); \
165 if (ret) \
166 return ret; \
167 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
168 return len; \
169 }
170
171 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
172 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
173 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
174
175 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
176 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
177 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
178 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
179 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
180 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
181 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
182 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
183
184 static ssize_t is_valid_bcd(u16 bcd_val)
185 {
186 if ((bcd_val & 0xf) > 9)
187 return -EINVAL;
188 if (((bcd_val >> 4) & 0xf) > 9)
189 return -EINVAL;
190 if (((bcd_val >> 8) & 0xf) > 9)
191 return -EINVAL;
192 if (((bcd_val >> 12) & 0xf) > 9)
193 return -EINVAL;
194 return 0;
195 }
196
197 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
198 const char *page, size_t len)
199 {
200 u16 bcdDevice;
201 int ret;
202
203 ret = kstrtou16(page, 0, &bcdDevice);
204 if (ret)
205 return ret;
206 ret = is_valid_bcd(bcdDevice);
207 if (ret)
208 return ret;
209
210 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
211 return len;
212 }
213
214 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
215 const char *page, size_t len)
216 {
217 u16 bcdUSB;
218 int ret;
219
220 ret = kstrtou16(page, 0, &bcdUSB);
221 if (ret)
222 return ret;
223 ret = is_valid_bcd(bcdUSB);
224 if (ret)
225 return ret;
226
227 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
228 return len;
229 }
230
231 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
232 {
233 char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name;
234
235 return sprintf(page, "%s\n", udc_name ?: "");
236 }
237
238 static int unregister_gadget(struct gadget_info *gi)
239 {
240 int ret;
241
242 if (!gi->composite.gadget_driver.udc_name)
243 return -ENODEV;
244
245 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
246 if (ret)
247 return ret;
248 kfree(gi->composite.gadget_driver.udc_name);
249 gi->composite.gadget_driver.udc_name = NULL;
250 return 0;
251 }
252
253 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
254 const char *page, size_t len)
255 {
256 struct gadget_info *gi = to_gadget_info(item);
257 char *name;
258 int ret;
259
260 name = kstrdup(page, GFP_KERNEL);
261 if (!name)
262 return -ENOMEM;
263 if (name[len - 1] == '\n')
264 name[len - 1] = '\0';
265
266 mutex_lock(&gi->lock);
267
268 if (!strlen(name)) {
269 ret = unregister_gadget(gi);
270 if (ret)
271 goto err;
272 kfree(name);
273 } else {
274 if (gi->composite.gadget_driver.udc_name) {
275 ret = -EBUSY;
276 goto err;
277 }
278 gi->composite.gadget_driver.udc_name = name;
279 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
280 if (ret) {
281 gi->composite.gadget_driver.udc_name = NULL;
282 goto err;
283 }
284 }
285 mutex_unlock(&gi->lock);
286 return len;
287 err:
288 kfree(name);
289 mutex_unlock(&gi->lock);
290 return ret;
291 }
292
293 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
294 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
295 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
296 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
297 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
298 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
299 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
300 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
301 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
302
303 static struct configfs_attribute *gadget_root_attrs[] = {
304 &gadget_dev_desc_attr_bDeviceClass,
305 &gadget_dev_desc_attr_bDeviceSubClass,
306 &gadget_dev_desc_attr_bDeviceProtocol,
307 &gadget_dev_desc_attr_bMaxPacketSize0,
308 &gadget_dev_desc_attr_idVendor,
309 &gadget_dev_desc_attr_idProduct,
310 &gadget_dev_desc_attr_bcdDevice,
311 &gadget_dev_desc_attr_bcdUSB,
312 &gadget_dev_desc_attr_UDC,
313 NULL,
314 };
315
316 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
317 {
318 return container_of(to_config_group(item), struct gadget_strings,
319 group);
320 }
321
322 static inline struct gadget_config_name *to_gadget_config_name(
323 struct config_item *item)
324 {
325 return container_of(to_config_group(item), struct gadget_config_name,
326 group);
327 }
328
329 static inline struct usb_function_instance *to_usb_function_instance(
330 struct config_item *item)
331 {
332 return container_of(to_config_group(item),
333 struct usb_function_instance, group);
334 }
335
336 static void gadget_info_attr_release(struct config_item *item)
337 {
338 struct gadget_info *gi = to_gadget_info(item);
339
340 WARN_ON(!list_empty(&gi->cdev.configs));
341 WARN_ON(!list_empty(&gi->string_list));
342 WARN_ON(!list_empty(&gi->available_func));
343 kfree(gi->composite.gadget_driver.function);
344 kfree(gi);
345 }
346
347 static struct configfs_item_operations gadget_root_item_ops = {
348 .release = gadget_info_attr_release,
349 };
350
351 static void gadget_config_attr_release(struct config_item *item)
352 {
353 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
354
355 WARN_ON(!list_empty(&cfg->c.functions));
356 list_del(&cfg->c.list);
357 kfree(cfg->c.label);
358 kfree(cfg);
359 }
360
361 static int config_usb_cfg_link(
362 struct config_item *usb_cfg_ci,
363 struct config_item *usb_func_ci)
364 {
365 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
366 struct usb_composite_dev *cdev = cfg->c.cdev;
367 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
368
369 struct config_group *group = to_config_group(usb_func_ci);
370 struct usb_function_instance *fi = container_of(group,
371 struct usb_function_instance, group);
372 struct usb_function_instance *a_fi;
373 struct usb_function *f;
374 int ret;
375
376 mutex_lock(&gi->lock);
377 /*
378 * Make sure this function is from within our _this_ gadget and not
379 * from another gadget or a random directory.
380 * Also a function instance can only be linked once.
381 */
382 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
383 if (a_fi == fi)
384 break;
385 }
386 if (a_fi != fi) {
387 ret = -EINVAL;
388 goto out;
389 }
390
391 list_for_each_entry(f, &cfg->func_list, list) {
392 if (f->fi == fi) {
393 ret = -EEXIST;
394 goto out;
395 }
396 }
397
398 f = usb_get_function(fi);
399 if (IS_ERR(f)) {
400 ret = PTR_ERR(f);
401 goto out;
402 }
403
404 /* stash the function until we bind it to the gadget */
405 list_add_tail(&f->list, &cfg->func_list);
406 ret = 0;
407 out:
408 mutex_unlock(&gi->lock);
409 return ret;
410 }
411
412 static int config_usb_cfg_unlink(
413 struct config_item *usb_cfg_ci,
414 struct config_item *usb_func_ci)
415 {
416 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
417 struct usb_composite_dev *cdev = cfg->c.cdev;
418 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
419
420 struct config_group *group = to_config_group(usb_func_ci);
421 struct usb_function_instance *fi = container_of(group,
422 struct usb_function_instance, group);
423 struct usb_function *f;
424
425 /*
426 * ideally I would like to forbid to unlink functions while a gadget is
427 * bound to an UDC. Since this isn't possible at the moment, we simply
428 * force an unbind, the function is available here and then we can
429 * remove the function.
430 */
431 mutex_lock(&gi->lock);
432 if (gi->composite.gadget_driver.udc_name)
433 unregister_gadget(gi);
434 WARN_ON(gi->composite.gadget_driver.udc_name);
435
436 list_for_each_entry(f, &cfg->func_list, list) {
437 if (f->fi == fi) {
438 list_del(&f->list);
439 usb_put_function(f);
440 mutex_unlock(&gi->lock);
441 return 0;
442 }
443 }
444 mutex_unlock(&gi->lock);
445 WARN(1, "Unable to locate function to unbind\n");
446 return 0;
447 }
448
449 static struct configfs_item_operations gadget_config_item_ops = {
450 .release = gadget_config_attr_release,
451 .allow_link = config_usb_cfg_link,
452 .drop_link = config_usb_cfg_unlink,
453 };
454
455
456 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
457 char *page)
458 {
459 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
460 }
461
462 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
463 const char *page, size_t len)
464 {
465 u16 val;
466 int ret;
467 ret = kstrtou16(page, 0, &val);
468 if (ret)
469 return ret;
470 if (DIV_ROUND_UP(val, 8) > 0xff)
471 return -ERANGE;
472 to_config_usb_cfg(item)->c.MaxPower = val;
473 return len;
474 }
475
476 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
477 char *page)
478 {
479 return sprintf(page, "0x%02x\n",
480 to_config_usb_cfg(item)->c.bmAttributes);
481 }
482
483 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
484 const char *page, size_t len)
485 {
486 u8 val;
487 int ret;
488 ret = kstrtou8(page, 0, &val);
489 if (ret)
490 return ret;
491 if (!(val & USB_CONFIG_ATT_ONE))
492 return -EINVAL;
493 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
494 USB_CONFIG_ATT_WAKEUP))
495 return -EINVAL;
496 to_config_usb_cfg(item)->c.bmAttributes = val;
497 return len;
498 }
499
500 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
501 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
502
503 static struct configfs_attribute *gadget_config_attrs[] = {
504 &gadget_config_desc_attr_MaxPower,
505 &gadget_config_desc_attr_bmAttributes,
506 NULL,
507 };
508
509 static struct config_item_type gadget_config_type = {
510 .ct_item_ops = &gadget_config_item_ops,
511 .ct_attrs = gadget_config_attrs,
512 .ct_owner = THIS_MODULE,
513 };
514
515 static struct config_item_type gadget_root_type = {
516 .ct_item_ops = &gadget_root_item_ops,
517 .ct_attrs = gadget_root_attrs,
518 .ct_owner = THIS_MODULE,
519 };
520
521 static void composite_init_dev(struct usb_composite_dev *cdev)
522 {
523 spin_lock_init(&cdev->lock);
524 INIT_LIST_HEAD(&cdev->configs);
525 INIT_LIST_HEAD(&cdev->gstrings);
526 }
527
528 static struct config_group *function_make(
529 struct config_group *group,
530 const char *name)
531 {
532 struct gadget_info *gi;
533 struct usb_function_instance *fi;
534 char buf[MAX_NAME_LEN];
535 char *func_name;
536 char *instance_name;
537 int ret;
538
539 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
540 if (ret >= MAX_NAME_LEN)
541 return ERR_PTR(-ENAMETOOLONG);
542
543 func_name = buf;
544 instance_name = strchr(func_name, '.');
545 if (!instance_name) {
546 pr_err("Unable to locate . in FUNC.INSTANCE\n");
547 return ERR_PTR(-EINVAL);
548 }
549 *instance_name = '\0';
550 instance_name++;
551
552 fi = usb_get_function_instance(func_name);
553 if (IS_ERR(fi))
554 return ERR_CAST(fi);
555
556 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
557 if (ret) {
558 usb_put_function_instance(fi);
559 return ERR_PTR(ret);
560 }
561 if (fi->set_inst_name) {
562 ret = fi->set_inst_name(fi, instance_name);
563 if (ret) {
564 usb_put_function_instance(fi);
565 return ERR_PTR(ret);
566 }
567 }
568
569 gi = container_of(group, struct gadget_info, functions_group);
570
571 mutex_lock(&gi->lock);
572 list_add_tail(&fi->cfs_list, &gi->available_func);
573 mutex_unlock(&gi->lock);
574 return &fi->group;
575 }
576
577 static void function_drop(
578 struct config_group *group,
579 struct config_item *item)
580 {
581 struct usb_function_instance *fi = to_usb_function_instance(item);
582 struct gadget_info *gi;
583
584 gi = container_of(group, struct gadget_info, functions_group);
585
586 mutex_lock(&gi->lock);
587 list_del(&fi->cfs_list);
588 mutex_unlock(&gi->lock);
589 config_item_put(item);
590 }
591
592 static struct configfs_group_operations functions_ops = {
593 .make_group = &function_make,
594 .drop_item = &function_drop,
595 };
596
597 static struct config_item_type functions_type = {
598 .ct_group_ops = &functions_ops,
599 .ct_owner = THIS_MODULE,
600 };
601
602 GS_STRINGS_RW(gadget_config_name, configuration);
603
604 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
605 &gadget_config_name_attr_configuration,
606 NULL,
607 };
608
609 static void gadget_config_name_attr_release(struct config_item *item)
610 {
611 struct gadget_config_name *cn = to_gadget_config_name(item);
612
613 kfree(cn->configuration);
614
615 list_del(&cn->list);
616 kfree(cn);
617 }
618
619 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
620 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
621
622 static struct config_group *config_desc_make(
623 struct config_group *group,
624 const char *name)
625 {
626 struct gadget_info *gi;
627 struct config_usb_cfg *cfg;
628 char buf[MAX_NAME_LEN];
629 char *num_str;
630 u8 num;
631 int ret;
632
633 gi = container_of(group, struct gadget_info, configs_group);
634 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
635 if (ret >= MAX_NAME_LEN)
636 return ERR_PTR(-ENAMETOOLONG);
637
638 num_str = strchr(buf, '.');
639 if (!num_str) {
640 pr_err("Unable to locate . in name.bConfigurationValue\n");
641 return ERR_PTR(-EINVAL);
642 }
643
644 *num_str = '\0';
645 num_str++;
646
647 if (!strlen(buf))
648 return ERR_PTR(-EINVAL);
649
650 ret = kstrtou8(num_str, 0, &num);
651 if (ret)
652 return ERR_PTR(ret);
653
654 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
655 if (!cfg)
656 return ERR_PTR(-ENOMEM);
657 cfg->c.label = kstrdup(buf, GFP_KERNEL);
658 if (!cfg->c.label) {
659 ret = -ENOMEM;
660 goto err;
661 }
662 cfg->c.bConfigurationValue = num;
663 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
664 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
665 INIT_LIST_HEAD(&cfg->string_list);
666 INIT_LIST_HEAD(&cfg->func_list);
667
668 config_group_init_type_name(&cfg->group, name,
669 &gadget_config_type);
670
671 config_group_init_type_name(&cfg->strings_group, "strings",
672 &gadget_config_name_strings_type);
673 configfs_add_default_group(&cfg->strings_group, &cfg->group);
674
675 ret = usb_add_config_only(&gi->cdev, &cfg->c);
676 if (ret)
677 goto err;
678
679 return &cfg->group;
680 err:
681 kfree(cfg->c.label);
682 kfree(cfg);
683 return ERR_PTR(ret);
684 }
685
686 static void config_desc_drop(
687 struct config_group *group,
688 struct config_item *item)
689 {
690 config_item_put(item);
691 }
692
693 static struct configfs_group_operations config_desc_ops = {
694 .make_group = &config_desc_make,
695 .drop_item = &config_desc_drop,
696 };
697
698 static struct config_item_type config_desc_type = {
699 .ct_group_ops = &config_desc_ops,
700 .ct_owner = THIS_MODULE,
701 };
702
703 GS_STRINGS_RW(gadget_strings, manufacturer);
704 GS_STRINGS_RW(gadget_strings, product);
705 GS_STRINGS_RW(gadget_strings, serialnumber);
706
707 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
708 &gadget_strings_attr_manufacturer,
709 &gadget_strings_attr_product,
710 &gadget_strings_attr_serialnumber,
711 NULL,
712 };
713
714 static void gadget_strings_attr_release(struct config_item *item)
715 {
716 struct gadget_strings *gs = to_gadget_strings(item);
717
718 kfree(gs->manufacturer);
719 kfree(gs->product);
720 kfree(gs->serialnumber);
721
722 list_del(&gs->list);
723 kfree(gs);
724 }
725
726 USB_CONFIG_STRING_RW_OPS(gadget_strings);
727 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
728
729 static inline struct os_desc *to_os_desc(struct config_item *item)
730 {
731 return container_of(to_config_group(item), struct os_desc, group);
732 }
733
734 static inline struct gadget_info *os_desc_item_to_gadget_info(
735 struct config_item *item)
736 {
737 return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
738 }
739
740 static ssize_t os_desc_use_show(struct config_item *item, char *page)
741 {
742 return sprintf(page, "%d",
743 os_desc_item_to_gadget_info(item)->use_os_desc);
744 }
745
746 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
747 size_t len)
748 {
749 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
750 int ret;
751 bool use;
752
753 mutex_lock(&gi->lock);
754 ret = strtobool(page, &use);
755 if (!ret) {
756 gi->use_os_desc = use;
757 ret = len;
758 }
759 mutex_unlock(&gi->lock);
760
761 return ret;
762 }
763
764 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
765 {
766 return sprintf(page, "%d",
767 os_desc_item_to_gadget_info(item)->b_vendor_code);
768 }
769
770 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
771 const char *page, size_t len)
772 {
773 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
774 int ret;
775 u8 b_vendor_code;
776
777 mutex_lock(&gi->lock);
778 ret = kstrtou8(page, 0, &b_vendor_code);
779 if (!ret) {
780 gi->b_vendor_code = b_vendor_code;
781 ret = len;
782 }
783 mutex_unlock(&gi->lock);
784
785 return ret;
786 }
787
788 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
789 {
790 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
791
792 memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
793 return OS_STRING_QW_SIGN_LEN;
794 }
795
796 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
797 size_t len)
798 {
799 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
800 int res, l;
801
802 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
803 if (page[l - 1] == '\n')
804 --l;
805
806 mutex_lock(&gi->lock);
807 res = utf8s_to_utf16s(page, l,
808 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
809 OS_STRING_QW_SIGN_LEN);
810 if (res > 0)
811 res = len;
812 mutex_unlock(&gi->lock);
813
814 return res;
815 }
816
817 CONFIGFS_ATTR(os_desc_, use);
818 CONFIGFS_ATTR(os_desc_, b_vendor_code);
819 CONFIGFS_ATTR(os_desc_, qw_sign);
820
821 static struct configfs_attribute *os_desc_attrs[] = {
822 &os_desc_attr_use,
823 &os_desc_attr_b_vendor_code,
824 &os_desc_attr_qw_sign,
825 NULL,
826 };
827
828 static void os_desc_attr_release(struct config_item *item)
829 {
830 struct os_desc *os_desc = to_os_desc(item);
831 kfree(os_desc);
832 }
833
834 static int os_desc_link(struct config_item *os_desc_ci,
835 struct config_item *usb_cfg_ci)
836 {
837 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
838 struct gadget_info, os_desc_group);
839 struct usb_composite_dev *cdev = &gi->cdev;
840 struct config_usb_cfg *c_target =
841 container_of(to_config_group(usb_cfg_ci),
842 struct config_usb_cfg, group);
843 struct usb_configuration *c;
844 int ret;
845
846 mutex_lock(&gi->lock);
847 list_for_each_entry(c, &cdev->configs, list) {
848 if (c == &c_target->c)
849 break;
850 }
851 if (c != &c_target->c) {
852 ret = -EINVAL;
853 goto out;
854 }
855
856 if (cdev->os_desc_config) {
857 ret = -EBUSY;
858 goto out;
859 }
860
861 cdev->os_desc_config = &c_target->c;
862 ret = 0;
863
864 out:
865 mutex_unlock(&gi->lock);
866 return ret;
867 }
868
869 static int os_desc_unlink(struct config_item *os_desc_ci,
870 struct config_item *usb_cfg_ci)
871 {
872 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
873 struct gadget_info, os_desc_group);
874 struct usb_composite_dev *cdev = &gi->cdev;
875
876 mutex_lock(&gi->lock);
877 if (gi->composite.gadget_driver.udc_name)
878 unregister_gadget(gi);
879 cdev->os_desc_config = NULL;
880 WARN_ON(gi->composite.gadget_driver.udc_name);
881 mutex_unlock(&gi->lock);
882 return 0;
883 }
884
885 static struct configfs_item_operations os_desc_ops = {
886 .release = os_desc_attr_release,
887 .allow_link = os_desc_link,
888 .drop_link = os_desc_unlink,
889 };
890
891 static struct config_item_type os_desc_type = {
892 .ct_item_ops = &os_desc_ops,
893 .ct_attrs = os_desc_attrs,
894 .ct_owner = THIS_MODULE,
895 };
896
897 static inline struct usb_os_desc_ext_prop
898 *to_usb_os_desc_ext_prop(struct config_item *item)
899 {
900 return container_of(item, struct usb_os_desc_ext_prop, item);
901 }
902
903 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
904 {
905 return sprintf(page, "%d", to_usb_os_desc_ext_prop(item)->type);
906 }
907
908 static ssize_t ext_prop_type_store(struct config_item *item,
909 const char *page, size_t len)
910 {
911 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
912 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
913 u8 type;
914 int ret;
915
916 if (desc->opts_mutex)
917 mutex_lock(desc->opts_mutex);
918 ret = kstrtou8(page, 0, &type);
919 if (ret)
920 goto end;
921 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
922 ret = -EINVAL;
923 goto end;
924 }
925
926 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
927 ext_prop->type == USB_EXT_PROP_LE32 ||
928 ext_prop->type == USB_EXT_PROP_BE32) &&
929 (type == USB_EXT_PROP_UNICODE ||
930 type == USB_EXT_PROP_UNICODE_ENV ||
931 type == USB_EXT_PROP_UNICODE_LINK))
932 ext_prop->data_len <<= 1;
933 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
934 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
935 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
936 (type == USB_EXT_PROP_BINARY ||
937 type == USB_EXT_PROP_LE32 ||
938 type == USB_EXT_PROP_BE32))
939 ext_prop->data_len >>= 1;
940 ext_prop->type = type;
941 ret = len;
942
943 end:
944 if (desc->opts_mutex)
945 mutex_unlock(desc->opts_mutex);
946 return ret;
947 }
948
949 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
950 {
951 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
952 int len = ext_prop->data_len;
953
954 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
955 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
956 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
957 len >>= 1;
958 memcpy(page, ext_prop->data, len);
959
960 return len;
961 }
962
963 static ssize_t ext_prop_data_store(struct config_item *item,
964 const char *page, size_t len)
965 {
966 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
967 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
968 char *new_data;
969 size_t ret_len = len;
970
971 if (page[len - 1] == '\n' || page[len - 1] == '\0')
972 --len;
973 new_data = kmemdup(page, len, GFP_KERNEL);
974 if (!new_data)
975 return -ENOMEM;
976
977 if (desc->opts_mutex)
978 mutex_lock(desc->opts_mutex);
979 kfree(ext_prop->data);
980 ext_prop->data = new_data;
981 desc->ext_prop_len -= ext_prop->data_len;
982 ext_prop->data_len = len;
983 desc->ext_prop_len += ext_prop->data_len;
984 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
985 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
986 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
987 desc->ext_prop_len -= ext_prop->data_len;
988 ext_prop->data_len <<= 1;
989 ext_prop->data_len += 2;
990 desc->ext_prop_len += ext_prop->data_len;
991 }
992 if (desc->opts_mutex)
993 mutex_unlock(desc->opts_mutex);
994 return ret_len;
995 }
996
997 CONFIGFS_ATTR(ext_prop_, type);
998 CONFIGFS_ATTR(ext_prop_, data);
999
1000 static struct configfs_attribute *ext_prop_attrs[] = {
1001 &ext_prop_attr_type,
1002 &ext_prop_attr_data,
1003 NULL,
1004 };
1005
1006 static void usb_os_desc_ext_prop_release(struct config_item *item)
1007 {
1008 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1009
1010 kfree(ext_prop); /* frees a whole chunk */
1011 }
1012
1013 static struct configfs_item_operations ext_prop_ops = {
1014 .release = usb_os_desc_ext_prop_release,
1015 };
1016
1017 static struct config_item *ext_prop_make(
1018 struct config_group *group,
1019 const char *name)
1020 {
1021 struct usb_os_desc_ext_prop *ext_prop;
1022 struct config_item_type *ext_prop_type;
1023 struct usb_os_desc *desc;
1024 char *vlabuf;
1025
1026 vla_group(data_chunk);
1027 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1028 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1029
1030 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1031 if (!vlabuf)
1032 return ERR_PTR(-ENOMEM);
1033
1034 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1035 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1036
1037 desc = container_of(group, struct usb_os_desc, group);
1038 ext_prop_type->ct_item_ops = &ext_prop_ops;
1039 ext_prop_type->ct_attrs = ext_prop_attrs;
1040 ext_prop_type->ct_owner = desc->owner;
1041
1042 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1043
1044 ext_prop->name = kstrdup(name, GFP_KERNEL);
1045 if (!ext_prop->name) {
1046 kfree(vlabuf);
1047 return ERR_PTR(-ENOMEM);
1048 }
1049 desc->ext_prop_len += 14;
1050 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1051 if (desc->opts_mutex)
1052 mutex_lock(desc->opts_mutex);
1053 desc->ext_prop_len += ext_prop->name_len;
1054 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1055 ++desc->ext_prop_count;
1056 if (desc->opts_mutex)
1057 mutex_unlock(desc->opts_mutex);
1058
1059 return &ext_prop->item;
1060 }
1061
1062 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1063 {
1064 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1065 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1066
1067 if (desc->opts_mutex)
1068 mutex_lock(desc->opts_mutex);
1069 list_del(&ext_prop->entry);
1070 --desc->ext_prop_count;
1071 kfree(ext_prop->name);
1072 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1073 if (desc->opts_mutex)
1074 mutex_unlock(desc->opts_mutex);
1075 config_item_put(item);
1076 }
1077
1078 static struct configfs_group_operations interf_grp_ops = {
1079 .make_item = &ext_prop_make,
1080 .drop_item = &ext_prop_drop,
1081 };
1082
1083 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1084 char *page)
1085 {
1086 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1087 return 8;
1088 }
1089
1090 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1091 const char *page, size_t len)
1092 {
1093 struct usb_os_desc *desc = to_usb_os_desc(item);
1094 int l;
1095
1096 l = min_t(int, 8, len);
1097 if (page[l - 1] == '\n')
1098 --l;
1099 if (desc->opts_mutex)
1100 mutex_lock(desc->opts_mutex);
1101 memcpy(desc->ext_compat_id, page, l);
1102
1103 if (desc->opts_mutex)
1104 mutex_unlock(desc->opts_mutex);
1105
1106 return len;
1107 }
1108
1109 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1110 char *page)
1111 {
1112 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1113 return 8;
1114 }
1115
1116 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1117 const char *page, size_t len)
1118 {
1119 struct usb_os_desc *desc = to_usb_os_desc(item);
1120 int l;
1121
1122 l = min_t(int, 8, len);
1123 if (page[l - 1] == '\n')
1124 --l;
1125 if (desc->opts_mutex)
1126 mutex_lock(desc->opts_mutex);
1127 memcpy(desc->ext_compat_id + 8, page, l);
1128
1129 if (desc->opts_mutex)
1130 mutex_unlock(desc->opts_mutex);
1131
1132 return len;
1133 }
1134
1135 CONFIGFS_ATTR(interf_grp_, compatible_id);
1136 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1137
1138 static struct configfs_attribute *interf_grp_attrs[] = {
1139 &interf_grp_attr_compatible_id,
1140 &interf_grp_attr_sub_compatible_id,
1141 NULL
1142 };
1143
1144 struct config_group *usb_os_desc_prepare_interf_dir(
1145 struct config_group *parent,
1146 int n_interf,
1147 struct usb_os_desc **desc,
1148 char **names,
1149 struct module *owner)
1150 {
1151 struct config_group *os_desc_group;
1152 struct config_item_type *os_desc_type, *interface_type;
1153
1154 vla_group(data_chunk);
1155 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1156 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1157 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1158
1159 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1160 if (!vlabuf)
1161 return ERR_PTR(-ENOMEM);
1162
1163 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1164 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1165 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1166
1167 os_desc_type->ct_owner = owner;
1168 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1169 configfs_add_default_group(os_desc_group, parent);
1170
1171 interface_type->ct_group_ops = &interf_grp_ops;
1172 interface_type->ct_attrs = interf_grp_attrs;
1173 interface_type->ct_owner = owner;
1174
1175 while (n_interf--) {
1176 struct usb_os_desc *d;
1177
1178 d = desc[n_interf];
1179 d->owner = owner;
1180 config_group_init_type_name(&d->group, "", interface_type);
1181 config_item_set_name(&d->group.cg_item, "interface.%s",
1182 names[n_interf]);
1183 configfs_add_default_group(&d->group, os_desc_group);
1184 }
1185
1186 return os_desc_group;
1187 }
1188 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1189
1190 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1191 {
1192 WARN_ON(1);
1193 return -EINVAL;
1194 }
1195
1196 int composite_dev_prepare(struct usb_composite_driver *composite,
1197 struct usb_composite_dev *dev);
1198
1199 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1200 struct usb_ep *ep0);
1201
1202 static void purge_configs_funcs(struct gadget_info *gi)
1203 {
1204 struct usb_configuration *c;
1205
1206 list_for_each_entry(c, &gi->cdev.configs, list) {
1207 struct usb_function *f, *tmp;
1208 struct config_usb_cfg *cfg;
1209
1210 cfg = container_of(c, struct config_usb_cfg, c);
1211
1212 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1213
1214 list_move_tail(&f->list, &cfg->func_list);
1215 if (f->unbind) {
1216 dev_dbg(&gi->cdev.gadget->dev,
1217 "unbind function '%s'/%p\n",
1218 f->name, f);
1219 f->unbind(c, f);
1220 }
1221 }
1222 c->next_interface_id = 0;
1223 memset(c->interface, 0, sizeof(c->interface));
1224 c->superspeed_plus = 0;
1225 c->superspeed = 0;
1226 c->highspeed = 0;
1227 c->fullspeed = 0;
1228 }
1229 }
1230
1231 static int configfs_composite_bind(struct usb_gadget *gadget,
1232 struct usb_gadget_driver *gdriver)
1233 {
1234 struct usb_composite_driver *composite = to_cdriver(gdriver);
1235 struct gadget_info *gi = container_of(composite,
1236 struct gadget_info, composite);
1237 struct usb_composite_dev *cdev = &gi->cdev;
1238 struct usb_configuration *c;
1239 struct usb_string *s;
1240 unsigned i;
1241 int ret;
1242
1243 /* the gi->lock is hold by the caller */
1244 cdev->gadget = gadget;
1245 set_gadget_data(gadget, cdev);
1246 ret = composite_dev_prepare(composite, cdev);
1247 if (ret)
1248 return ret;
1249 /* and now the gadget bind */
1250 ret = -EINVAL;
1251
1252 if (list_empty(&gi->cdev.configs)) {
1253 pr_err("Need at least one configuration in %s.\n",
1254 gi->composite.name);
1255 goto err_comp_cleanup;
1256 }
1257
1258
1259 list_for_each_entry(c, &gi->cdev.configs, list) {
1260 struct config_usb_cfg *cfg;
1261
1262 cfg = container_of(c, struct config_usb_cfg, c);
1263 if (list_empty(&cfg->func_list)) {
1264 pr_err("Config %s/%d of %s needs at least one function.\n",
1265 c->label, c->bConfigurationValue,
1266 gi->composite.name);
1267 goto err_comp_cleanup;
1268 }
1269 }
1270
1271 /* init all strings */
1272 if (!list_empty(&gi->string_list)) {
1273 struct gadget_strings *gs;
1274
1275 i = 0;
1276 list_for_each_entry(gs, &gi->string_list, list) {
1277
1278 gi->gstrings[i] = &gs->stringtab_dev;
1279 gs->stringtab_dev.strings = gs->strings;
1280 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1281 gs->manufacturer;
1282 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1283 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1284 i++;
1285 }
1286 gi->gstrings[i] = NULL;
1287 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1288 USB_GADGET_FIRST_AVAIL_IDX);
1289 if (IS_ERR(s)) {
1290 ret = PTR_ERR(s);
1291 goto err_comp_cleanup;
1292 }
1293
1294 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1295 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1296 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1297 }
1298
1299 if (gi->use_os_desc) {
1300 cdev->use_os_string = true;
1301 cdev->b_vendor_code = gi->b_vendor_code;
1302 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1303 }
1304
1305 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1306 struct usb_descriptor_header *usb_desc;
1307
1308 usb_desc = usb_otg_descriptor_alloc(gadget);
1309 if (!usb_desc) {
1310 ret = -ENOMEM;
1311 goto err_comp_cleanup;
1312 }
1313 usb_otg_descriptor_init(gadget, usb_desc);
1314 otg_desc[0] = usb_desc;
1315 otg_desc[1] = NULL;
1316 }
1317
1318 /* Go through all configs, attach all functions */
1319 list_for_each_entry(c, &gi->cdev.configs, list) {
1320 struct config_usb_cfg *cfg;
1321 struct usb_function *f;
1322 struct usb_function *tmp;
1323 struct gadget_config_name *cn;
1324
1325 if (gadget_is_otg(gadget))
1326 c->descriptors = otg_desc;
1327
1328 cfg = container_of(c, struct config_usb_cfg, c);
1329 if (!list_empty(&cfg->string_list)) {
1330 i = 0;
1331 list_for_each_entry(cn, &cfg->string_list, list) {
1332 cfg->gstrings[i] = &cn->stringtab_dev;
1333 cn->stringtab_dev.strings = &cn->strings;
1334 cn->strings.s = cn->configuration;
1335 i++;
1336 }
1337 cfg->gstrings[i] = NULL;
1338 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1339 if (IS_ERR(s)) {
1340 ret = PTR_ERR(s);
1341 goto err_comp_cleanup;
1342 }
1343 c->iConfiguration = s[0].id;
1344 }
1345
1346 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1347 list_del(&f->list);
1348 ret = usb_add_function(c, f);
1349 if (ret) {
1350 list_add(&f->list, &cfg->func_list);
1351 goto err_purge_funcs;
1352 }
1353 }
1354 usb_ep_autoconfig_reset(cdev->gadget);
1355 }
1356 if (cdev->use_os_string) {
1357 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1358 if (ret)
1359 goto err_purge_funcs;
1360 }
1361
1362 usb_ep_autoconfig_reset(cdev->gadget);
1363 return 0;
1364
1365 err_purge_funcs:
1366 purge_configs_funcs(gi);
1367 err_comp_cleanup:
1368 composite_dev_cleanup(cdev);
1369 return ret;
1370 }
1371
1372 static void configfs_composite_unbind(struct usb_gadget *gadget)
1373 {
1374 struct usb_composite_dev *cdev;
1375 struct gadget_info *gi;
1376
1377 /* the gi->lock is hold by the caller */
1378
1379 cdev = get_gadget_data(gadget);
1380 gi = container_of(cdev, struct gadget_info, cdev);
1381
1382 kfree(otg_desc[0]);
1383 otg_desc[0] = NULL;
1384 purge_configs_funcs(gi);
1385 composite_dev_cleanup(cdev);
1386 usb_ep_autoconfig_reset(cdev->gadget);
1387 cdev->gadget = NULL;
1388 set_gadget_data(gadget, NULL);
1389 }
1390
1391 static const struct usb_gadget_driver configfs_driver_template = {
1392 .bind = configfs_composite_bind,
1393 .unbind = configfs_composite_unbind,
1394
1395 .setup = composite_setup,
1396 .reset = composite_disconnect,
1397 .disconnect = composite_disconnect,
1398
1399 .suspend = composite_suspend,
1400 .resume = composite_resume,
1401
1402 .max_speed = USB_SPEED_SUPER,
1403 .driver = {
1404 .owner = THIS_MODULE,
1405 .name = "configfs-gadget",
1406 },
1407 .match_existing_only = 1,
1408 };
1409
1410 static struct config_group *gadgets_make(
1411 struct config_group *group,
1412 const char *name)
1413 {
1414 struct gadget_info *gi;
1415
1416 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1417 if (!gi)
1418 return ERR_PTR(-ENOMEM);
1419
1420 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1421
1422 config_group_init_type_name(&gi->functions_group, "functions",
1423 &functions_type);
1424 configfs_add_default_group(&gi->functions_group, &gi->group);
1425
1426 config_group_init_type_name(&gi->configs_group, "configs",
1427 &config_desc_type);
1428 configfs_add_default_group(&gi->configs_group, &gi->group);
1429
1430 config_group_init_type_name(&gi->strings_group, "strings",
1431 &gadget_strings_strings_type);
1432 configfs_add_default_group(&gi->strings_group, &gi->group);
1433
1434 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1435 &os_desc_type);
1436 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1437
1438 gi->composite.bind = configfs_do_nothing;
1439 gi->composite.unbind = configfs_do_nothing;
1440 gi->composite.suspend = NULL;
1441 gi->composite.resume = NULL;
1442 gi->composite.max_speed = USB_SPEED_SUPER;
1443
1444 mutex_init(&gi->lock);
1445 INIT_LIST_HEAD(&gi->string_list);
1446 INIT_LIST_HEAD(&gi->available_func);
1447
1448 composite_init_dev(&gi->cdev);
1449 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1450 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1451 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1452
1453 gi->composite.gadget_driver = configfs_driver_template;
1454
1455 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1456 gi->composite.name = gi->composite.gadget_driver.function;
1457
1458 if (!gi->composite.gadget_driver.function)
1459 goto err;
1460
1461 return &gi->group;
1462 err:
1463 kfree(gi);
1464 return ERR_PTR(-ENOMEM);
1465 }
1466
1467 static void gadgets_drop(struct config_group *group, struct config_item *item)
1468 {
1469 config_item_put(item);
1470 }
1471
1472 static struct configfs_group_operations gadgets_ops = {
1473 .make_group = &gadgets_make,
1474 .drop_item = &gadgets_drop,
1475 };
1476
1477 static struct config_item_type gadgets_type = {
1478 .ct_group_ops = &gadgets_ops,
1479 .ct_owner = THIS_MODULE,
1480 };
1481
1482 static struct configfs_subsystem gadget_subsys = {
1483 .su_group = {
1484 .cg_item = {
1485 .ci_namebuf = "usb_gadget",
1486 .ci_type = &gadgets_type,
1487 },
1488 },
1489 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1490 };
1491
1492 void unregister_gadget_item(struct config_item *item)
1493 {
1494 struct gadget_info *gi = to_gadget_info(item);
1495
1496 mutex_lock(&gi->lock);
1497 unregister_gadget(gi);
1498 mutex_unlock(&gi->lock);
1499 }
1500 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1501
1502 static int __init gadget_cfs_init(void)
1503 {
1504 int ret;
1505
1506 config_group_init(&gadget_subsys.su_group);
1507
1508 ret = configfs_register_subsystem(&gadget_subsys);
1509 return ret;
1510 }
1511 module_init(gadget_cfs_init);
1512
1513 static void __exit gadget_cfs_exit(void)
1514 {
1515 configfs_unregister_subsystem(&gadget_subsys);
1516 }
1517 module_exit(gadget_cfs_exit);
Linux with added FPC-III support