These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / drivers / usb / gadget / configfs.c
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         struct config_group *default_groups[5];
53
54         struct mutex lock;
55         struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
56         struct list_head string_list;
57         struct list_head available_func;
58
59         const char *udc_name;
60         struct usb_composite_driver composite;
61         struct usb_composite_dev cdev;
62         bool use_os_desc;
63         char b_vendor_code;
64         char qw_sign[OS_STRING_QW_SIGN_LEN];
65 };
66
67 static inline struct gadget_info *to_gadget_info(struct config_item *item)
68 {
69          return container_of(to_config_group(item), struct gadget_info, group);
70 }
71
72 struct config_usb_cfg {
73         struct config_group group;
74         struct config_group strings_group;
75         struct config_group *default_groups[2];
76         struct list_head string_list;
77         struct usb_configuration c;
78         struct list_head func_list;
79         struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
80 };
81
82 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
83 {
84         return container_of(to_config_group(item), struct config_usb_cfg,
85                         group);
86 }
87
88 struct gadget_strings {
89         struct usb_gadget_strings stringtab_dev;
90         struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
91         char *manufacturer;
92         char *product;
93         char *serialnumber;
94
95         struct config_group group;
96         struct list_head list;
97 };
98
99 struct os_desc {
100         struct config_group group;
101 };
102
103 struct gadget_config_name {
104         struct usb_gadget_strings stringtab_dev;
105         struct usb_string strings;
106         char *configuration;
107
108         struct config_group group;
109         struct list_head list;
110 };
111
112 static int usb_string_copy(const char *s, char **s_copy)
113 {
114         int ret;
115         char *str;
116         char *copy = *s_copy;
117         ret = strlen(s);
118         if (ret > 126)
119                 return -EOVERFLOW;
120
121         str = kstrdup(s, GFP_KERNEL);
122         if (!str)
123                 return -ENOMEM;
124         if (str[ret - 1] == '\n')
125                 str[ret - 1] = '\0';
126         kfree(copy);
127         *s_copy = str;
128         return 0;
129 }
130
131 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name)      \
132 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
133                         char *page)     \
134 {       \
135         return sprintf(page, "0x%02x\n", \
136                 to_gadget_info(item)->cdev.desc.__name); \
137 }
138
139 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name)     \
140 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
141                         char *page)     \
142 {       \
143         return sprintf(page, "0x%04x\n", \
144                 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
145 }
146
147
148 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name)               \
149 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
150                 const char *page, size_t len)           \
151 {                                                       \
152         u8 val;                                         \
153         int ret;                                        \
154         ret = kstrtou8(page, 0, &val);                  \
155         if (ret)                                        \
156                 return ret;                             \
157         to_gadget_info(item)->cdev.desc._name = val;    \
158         return len;                                     \
159 }
160
161 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name)      \
162 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
163                 const char *page, size_t len)           \
164 {                                                       \
165         u16 val;                                        \
166         int ret;                                        \
167         ret = kstrtou16(page, 0, &val);                 \
168         if (ret)                                        \
169                 return ret;                             \
170         to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val);     \
171         return len;                                     \
172 }
173
174 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type)  \
175         GI_DEVICE_DESC_SIMPLE_R_##_type(_name)  \
176         GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
177
178 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
179 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
180 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
181 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
182 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
183 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
184 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
185 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
186
187 static ssize_t is_valid_bcd(u16 bcd_val)
188 {
189         if ((bcd_val & 0xf) > 9)
190                 return -EINVAL;
191         if (((bcd_val >> 4) & 0xf) > 9)
192                 return -EINVAL;
193         if (((bcd_val >> 8) & 0xf) > 9)
194                 return -EINVAL;
195         if (((bcd_val >> 12) & 0xf) > 9)
196                 return -EINVAL;
197         return 0;
198 }
199
200 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
201                 const char *page, size_t len)
202 {
203         u16 bcdDevice;
204         int ret;
205
206         ret = kstrtou16(page, 0, &bcdDevice);
207         if (ret)
208                 return ret;
209         ret = is_valid_bcd(bcdDevice);
210         if (ret)
211                 return ret;
212
213         to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
214         return len;
215 }
216
217 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
218                 const char *page, size_t len)
219 {
220         u16 bcdUSB;
221         int ret;
222
223         ret = kstrtou16(page, 0, &bcdUSB);
224         if (ret)
225                 return ret;
226         ret = is_valid_bcd(bcdUSB);
227         if (ret)
228                 return ret;
229
230         to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
231         return len;
232 }
233
234 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
235 {
236         return sprintf(page, "%s\n", to_gadget_info(item)->udc_name ?: "");
237 }
238
239 static int unregister_gadget(struct gadget_info *gi)
240 {
241         int ret;
242
243         if (!gi->udc_name)
244                 return -ENODEV;
245
246         ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
247         if (ret)
248                 return ret;
249         kfree(gi->udc_name);
250         gi->udc_name = NULL;
251         return 0;
252 }
253
254 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
255                 const char *page, size_t len)
256 {
257         struct gadget_info *gi = to_gadget_info(item);
258         char *name;
259         int ret;
260
261         name = kstrdup(page, GFP_KERNEL);
262         if (!name)
263                 return -ENOMEM;
264         if (name[len - 1] == '\n')
265                 name[len - 1] = '\0';
266
267         mutex_lock(&gi->lock);
268
269         if (!strlen(name)) {
270                 ret = unregister_gadget(gi);
271                 if (ret)
272                         goto err;
273         } else {
274                 if (gi->udc_name) {
275                         ret = -EBUSY;
276                         goto err;
277                 }
278                 ret = usb_udc_attach_driver(name, &gi->composite.gadget_driver);
279                 if (ret)
280                         goto err;
281                 gi->udc_name = name;
282         }
283         mutex_unlock(&gi->lock);
284         return len;
285 err:
286         kfree(name);
287         mutex_unlock(&gi->lock);
288         return ret;
289 }
290
291 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
292 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
293 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
294 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
295 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
296 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
297 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
298 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
299 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
300
301 static struct configfs_attribute *gadget_root_attrs[] = {
302         &gadget_dev_desc_attr_bDeviceClass,
303         &gadget_dev_desc_attr_bDeviceSubClass,
304         &gadget_dev_desc_attr_bDeviceProtocol,
305         &gadget_dev_desc_attr_bMaxPacketSize0,
306         &gadget_dev_desc_attr_idVendor,
307         &gadget_dev_desc_attr_idProduct,
308         &gadget_dev_desc_attr_bcdDevice,
309         &gadget_dev_desc_attr_bcdUSB,
310         &gadget_dev_desc_attr_UDC,
311         NULL,
312 };
313
314 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
315 {
316          return container_of(to_config_group(item), struct gadget_strings,
317                          group);
318 }
319
320 static inline struct gadget_config_name *to_gadget_config_name(
321                 struct config_item *item)
322 {
323          return container_of(to_config_group(item), struct gadget_config_name,
324                          group);
325 }
326
327 static inline struct usb_function_instance *to_usb_function_instance(
328                 struct config_item *item)
329 {
330          return container_of(to_config_group(item),
331                          struct usb_function_instance, group);
332 }
333
334 static void gadget_info_attr_release(struct config_item *item)
335 {
336         struct gadget_info *gi = to_gadget_info(item);
337
338         WARN_ON(!list_empty(&gi->cdev.configs));
339         WARN_ON(!list_empty(&gi->string_list));
340         WARN_ON(!list_empty(&gi->available_func));
341         kfree(gi->composite.gadget_driver.function);
342         kfree(gi);
343 }
344
345 static struct configfs_item_operations gadget_root_item_ops = {
346         .release                = gadget_info_attr_release,
347 };
348
349 static void gadget_config_attr_release(struct config_item *item)
350 {
351         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
352
353         WARN_ON(!list_empty(&cfg->c.functions));
354         list_del(&cfg->c.list);
355         kfree(cfg->c.label);
356         kfree(cfg);
357 }
358
359 static int config_usb_cfg_link(
360         struct config_item *usb_cfg_ci,
361         struct config_item *usb_func_ci)
362 {
363         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
364         struct usb_composite_dev *cdev = cfg->c.cdev;
365         struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
366
367         struct config_group *group = to_config_group(usb_func_ci);
368         struct usb_function_instance *fi = container_of(group,
369                         struct usb_function_instance, group);
370         struct usb_function_instance *a_fi;
371         struct usb_function *f;
372         int ret;
373
374         mutex_lock(&gi->lock);
375         /*
376          * Make sure this function is from within our _this_ gadget and not
377          * from another gadget or a random directory.
378          * Also a function instance can only be linked once.
379          */
380         list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
381                 if (a_fi == fi)
382                         break;
383         }
384         if (a_fi != fi) {
385                 ret = -EINVAL;
386                 goto out;
387         }
388
389         list_for_each_entry(f, &cfg->func_list, list) {
390                 if (f->fi == fi) {
391                         ret = -EEXIST;
392                         goto out;
393                 }
394         }
395
396         f = usb_get_function(fi);
397         if (IS_ERR(f)) {
398                 ret = PTR_ERR(f);
399                 goto out;
400         }
401
402         /* stash the function until we bind it to the gadget */
403         list_add_tail(&f->list, &cfg->func_list);
404         ret = 0;
405 out:
406         mutex_unlock(&gi->lock);
407         return ret;
408 }
409
410 static int config_usb_cfg_unlink(
411         struct config_item *usb_cfg_ci,
412         struct config_item *usb_func_ci)
413 {
414         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
415         struct usb_composite_dev *cdev = cfg->c.cdev;
416         struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
417
418         struct config_group *group = to_config_group(usb_func_ci);
419         struct usb_function_instance *fi = container_of(group,
420                         struct usb_function_instance, group);
421         struct usb_function *f;
422
423         /*
424          * ideally I would like to forbid to unlink functions while a gadget is
425          * bound to an UDC. Since this isn't possible at the moment, we simply
426          * force an unbind, the function is available here and then we can
427          * remove the function.
428          */
429         mutex_lock(&gi->lock);
430         if (gi->udc_name)
431                 unregister_gadget(gi);
432         WARN_ON(gi->udc_name);
433
434         list_for_each_entry(f, &cfg->func_list, list) {
435                 if (f->fi == fi) {
436                         list_del(&f->list);
437                         usb_put_function(f);
438                         mutex_unlock(&gi->lock);
439                         return 0;
440                 }
441         }
442         mutex_unlock(&gi->lock);
443         WARN(1, "Unable to locate function to unbind\n");
444         return 0;
445 }
446
447 static struct configfs_item_operations gadget_config_item_ops = {
448         .release                = gadget_config_attr_release,
449         .allow_link             = config_usb_cfg_link,
450         .drop_link              = config_usb_cfg_unlink,
451 };
452
453
454 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
455                 char *page)
456 {
457         return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
458 }
459
460 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
461                 const char *page, size_t len)
462 {
463         u16 val;
464         int ret;
465         ret = kstrtou16(page, 0, &val);
466         if (ret)
467                 return ret;
468         if (DIV_ROUND_UP(val, 8) > 0xff)
469                 return -ERANGE;
470         to_config_usb_cfg(item)->c.MaxPower = val;
471         return len;
472 }
473
474 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
475                 char *page)
476 {
477         return sprintf(page, "0x%02x\n",
478                 to_config_usb_cfg(item)->c.bmAttributes);
479 }
480
481 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
482                 const char *page, size_t len)
483 {
484         u8 val;
485         int ret;
486         ret = kstrtou8(page, 0, &val);
487         if (ret)
488                 return ret;
489         if (!(val & USB_CONFIG_ATT_ONE))
490                 return -EINVAL;
491         if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
492                                 USB_CONFIG_ATT_WAKEUP))
493                 return -EINVAL;
494         to_config_usb_cfg(item)->c.bmAttributes = val;
495         return len;
496 }
497
498 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
499 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
500
501 static struct configfs_attribute *gadget_config_attrs[] = {
502         &gadget_config_desc_attr_MaxPower,
503         &gadget_config_desc_attr_bmAttributes,
504         NULL,
505 };
506
507 static struct config_item_type gadget_config_type = {
508         .ct_item_ops    = &gadget_config_item_ops,
509         .ct_attrs       = gadget_config_attrs,
510         .ct_owner       = THIS_MODULE,
511 };
512
513 static struct config_item_type gadget_root_type = {
514         .ct_item_ops    = &gadget_root_item_ops,
515         .ct_attrs       = gadget_root_attrs,
516         .ct_owner       = THIS_MODULE,
517 };
518
519 static void composite_init_dev(struct usb_composite_dev *cdev)
520 {
521         spin_lock_init(&cdev->lock);
522         INIT_LIST_HEAD(&cdev->configs);
523         INIT_LIST_HEAD(&cdev->gstrings);
524 }
525
526 static struct config_group *function_make(
527                 struct config_group *group,
528                 const char *name)
529 {
530         struct gadget_info *gi;
531         struct usb_function_instance *fi;
532         char buf[MAX_NAME_LEN];
533         char *func_name;
534         char *instance_name;
535         int ret;
536
537         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
538         if (ret >= MAX_NAME_LEN)
539                 return ERR_PTR(-ENAMETOOLONG);
540
541         func_name = buf;
542         instance_name = strchr(func_name, '.');
543         if (!instance_name) {
544                 pr_err("Unable to locate . in FUNC.INSTANCE\n");
545                 return ERR_PTR(-EINVAL);
546         }
547         *instance_name = '\0';
548         instance_name++;
549
550         fi = usb_get_function_instance(func_name);
551         if (IS_ERR(fi))
552                 return ERR_CAST(fi);
553
554         ret = config_item_set_name(&fi->group.cg_item, "%s", name);
555         if (ret) {
556                 usb_put_function_instance(fi);
557                 return ERR_PTR(ret);
558         }
559         if (fi->set_inst_name) {
560                 ret = fi->set_inst_name(fi, instance_name);
561                 if (ret) {
562                         usb_put_function_instance(fi);
563                         return ERR_PTR(ret);
564                 }
565         }
566
567         gi = container_of(group, struct gadget_info, functions_group);
568
569         mutex_lock(&gi->lock);
570         list_add_tail(&fi->cfs_list, &gi->available_func);
571         mutex_unlock(&gi->lock);
572         return &fi->group;
573 }
574
575 static void function_drop(
576                 struct config_group *group,
577                 struct config_item *item)
578 {
579         struct usb_function_instance *fi = to_usb_function_instance(item);
580         struct gadget_info *gi;
581
582         gi = container_of(group, struct gadget_info, functions_group);
583
584         mutex_lock(&gi->lock);
585         list_del(&fi->cfs_list);
586         mutex_unlock(&gi->lock);
587         config_item_put(item);
588 }
589
590 static struct configfs_group_operations functions_ops = {
591         .make_group     = &function_make,
592         .drop_item      = &function_drop,
593 };
594
595 static struct config_item_type functions_type = {
596         .ct_group_ops   = &functions_ops,
597         .ct_owner       = THIS_MODULE,
598 };
599
600 GS_STRINGS_RW(gadget_config_name, configuration);
601
602 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
603         &gadget_config_name_attr_configuration,
604         NULL,
605 };
606
607 static void gadget_config_name_attr_release(struct config_item *item)
608 {
609         struct gadget_config_name *cn = to_gadget_config_name(item);
610
611         kfree(cn->configuration);
612
613         list_del(&cn->list);
614         kfree(cn);
615 }
616
617 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
618 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
619
620 static struct config_group *config_desc_make(
621                 struct config_group *group,
622                 const char *name)
623 {
624         struct gadget_info *gi;
625         struct config_usb_cfg *cfg;
626         char buf[MAX_NAME_LEN];
627         char *num_str;
628         u8 num;
629         int ret;
630
631         gi = container_of(group, struct gadget_info, configs_group);
632         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
633         if (ret >= MAX_NAME_LEN)
634                 return ERR_PTR(-ENAMETOOLONG);
635
636         num_str = strchr(buf, '.');
637         if (!num_str) {
638                 pr_err("Unable to locate . in name.bConfigurationValue\n");
639                 return ERR_PTR(-EINVAL);
640         }
641
642         *num_str = '\0';
643         num_str++;
644
645         if (!strlen(buf))
646                 return ERR_PTR(-EINVAL);
647
648         ret = kstrtou8(num_str, 0, &num);
649         if (ret)
650                 return ERR_PTR(ret);
651
652         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
653         if (!cfg)
654                 return ERR_PTR(-ENOMEM);
655         cfg->c.label = kstrdup(buf, GFP_KERNEL);
656         if (!cfg->c.label) {
657                 ret = -ENOMEM;
658                 goto err;
659         }
660         cfg->c.bConfigurationValue = num;
661         cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
662         cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
663         INIT_LIST_HEAD(&cfg->string_list);
664         INIT_LIST_HEAD(&cfg->func_list);
665
666         cfg->group.default_groups = cfg->default_groups;
667         cfg->default_groups[0] = &cfg->strings_group;
668
669         config_group_init_type_name(&cfg->group, name,
670                                 &gadget_config_type);
671         config_group_init_type_name(&cfg->strings_group, "strings",
672                         &gadget_config_name_strings_type);
673
674         ret = usb_add_config_only(&gi->cdev, &cfg->c);
675         if (ret)
676                 goto err;
677
678         return &cfg->group;
679 err:
680         kfree(cfg->c.label);
681         kfree(cfg);
682         return ERR_PTR(ret);
683 }
684
685 static void config_desc_drop(
686                 struct config_group *group,
687                 struct config_item *item)
688 {
689         config_item_put(item);
690 }
691
692 static struct configfs_group_operations config_desc_ops = {
693         .make_group     = &config_desc_make,
694         .drop_item      = &config_desc_drop,
695 };
696
697 static struct config_item_type config_desc_type = {
698         .ct_group_ops   = &config_desc_ops,
699         .ct_owner       = THIS_MODULE,
700 };
701
702 GS_STRINGS_RW(gadget_strings, manufacturer);
703 GS_STRINGS_RW(gadget_strings, product);
704 GS_STRINGS_RW(gadget_strings, serialnumber);
705
706 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
707         &gadget_strings_attr_manufacturer,
708         &gadget_strings_attr_product,
709         &gadget_strings_attr_serialnumber,
710         NULL,
711 };
712
713 static void gadget_strings_attr_release(struct config_item *item)
714 {
715         struct gadget_strings *gs = to_gadget_strings(item);
716
717         kfree(gs->manufacturer);
718         kfree(gs->product);
719         kfree(gs->serialnumber);
720
721         list_del(&gs->list);
722         kfree(gs);
723 }
724
725 USB_CONFIG_STRING_RW_OPS(gadget_strings);
726 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
727
728 static inline struct os_desc *to_os_desc(struct config_item *item)
729 {
730         return container_of(to_config_group(item), struct os_desc, group);
731 }
732
733 static inline struct gadget_info *os_desc_item_to_gadget_info(
734                 struct config_item *item)
735 {
736         return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
737 }
738
739 static ssize_t os_desc_use_show(struct config_item *item, char *page)
740 {
741         return sprintf(page, "%d",
742                         os_desc_item_to_gadget_info(item)->use_os_desc);
743 }
744
745 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
746                                  size_t len)
747 {
748         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
749         int ret;
750         bool use;
751
752         mutex_lock(&gi->lock);
753         ret = strtobool(page, &use);
754         if (!ret) {
755                 gi->use_os_desc = use;
756                 ret = len;
757         }
758         mutex_unlock(&gi->lock);
759
760         return ret;
761 }
762
763 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
764 {
765         return sprintf(page, "%d",
766                         os_desc_item_to_gadget_info(item)->b_vendor_code);
767 }
768
769 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
770                                            const char *page, size_t len)
771 {
772         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
773         int ret;
774         u8 b_vendor_code;
775
776         mutex_lock(&gi->lock);
777         ret = kstrtou8(page, 0, &b_vendor_code);
778         if (!ret) {
779                 gi->b_vendor_code = b_vendor_code;
780                 ret = len;
781         }
782         mutex_unlock(&gi->lock);
783
784         return ret;
785 }
786
787 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
788 {
789         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
790
791         memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
792         return OS_STRING_QW_SIGN_LEN;
793 }
794
795 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
796                                      size_t len)
797 {
798         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
799         int res, l;
800
801         l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
802         if (page[l - 1] == '\n')
803                 --l;
804
805         mutex_lock(&gi->lock);
806         res = utf8s_to_utf16s(page, l,
807                               UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
808                               OS_STRING_QW_SIGN_LEN);
809         if (res > 0)
810                 res = len;
811         mutex_unlock(&gi->lock);
812
813         return res;
814 }
815
816 CONFIGFS_ATTR(os_desc_, use);
817 CONFIGFS_ATTR(os_desc_, b_vendor_code);
818 CONFIGFS_ATTR(os_desc_, qw_sign);
819
820 static struct configfs_attribute *os_desc_attrs[] = {
821         &os_desc_attr_use,
822         &os_desc_attr_b_vendor_code,
823         &os_desc_attr_qw_sign,
824         NULL,
825 };
826
827 static void os_desc_attr_release(struct config_item *item)
828 {
829         struct os_desc *os_desc = to_os_desc(item);
830         kfree(os_desc);
831 }
832
833 static int os_desc_link(struct config_item *os_desc_ci,
834                         struct config_item *usb_cfg_ci)
835 {
836         struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
837                                         struct gadget_info, os_desc_group);
838         struct usb_composite_dev *cdev = &gi->cdev;
839         struct config_usb_cfg *c_target =
840                 container_of(to_config_group(usb_cfg_ci),
841                              struct config_usb_cfg, group);
842         struct usb_configuration *c;
843         int ret;
844
845         mutex_lock(&gi->lock);
846         list_for_each_entry(c, &cdev->configs, list) {
847                 if (c == &c_target->c)
848                         break;
849         }
850         if (c != &c_target->c) {
851                 ret = -EINVAL;
852                 goto out;
853         }
854
855         if (cdev->os_desc_config) {
856                 ret = -EBUSY;
857                 goto out;
858         }
859
860         cdev->os_desc_config = &c_target->c;
861         ret = 0;
862
863 out:
864         mutex_unlock(&gi->lock);
865         return ret;
866 }
867
868 static int os_desc_unlink(struct config_item *os_desc_ci,
869                           struct config_item *usb_cfg_ci)
870 {
871         struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
872                                         struct gadget_info, os_desc_group);
873         struct usb_composite_dev *cdev = &gi->cdev;
874
875         mutex_lock(&gi->lock);
876         if (gi->udc_name)
877                 unregister_gadget(gi);
878         cdev->os_desc_config = NULL;
879         WARN_ON(gi->udc_name);
880         mutex_unlock(&gi->lock);
881         return 0;
882 }
883
884 static struct configfs_item_operations os_desc_ops = {
885         .release                = os_desc_attr_release,
886         .allow_link             = os_desc_link,
887         .drop_link              = os_desc_unlink,
888 };
889
890 static struct config_item_type os_desc_type = {
891         .ct_item_ops    = &os_desc_ops,
892         .ct_attrs       = os_desc_attrs,
893         .ct_owner       = THIS_MODULE,
894 };
895
896 static inline struct usb_os_desc_ext_prop
897 *to_usb_os_desc_ext_prop(struct config_item *item)
898 {
899         return container_of(item, struct usb_os_desc_ext_prop, item);
900 }
901
902 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
903 {
904         return sprintf(page, "%d", to_usb_os_desc_ext_prop(item)->type);
905 }
906
907 static ssize_t ext_prop_type_store(struct config_item *item,
908                                    const char *page, size_t len)
909 {
910         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
911         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
912         u8 type;
913         int ret;
914
915         if (desc->opts_mutex)
916                 mutex_lock(desc->opts_mutex);
917         ret = kstrtou8(page, 0, &type);
918         if (ret)
919                 goto end;
920         if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
921                 ret = -EINVAL;
922                 goto end;
923         }
924
925         if ((ext_prop->type == USB_EXT_PROP_BINARY ||
926             ext_prop->type == USB_EXT_PROP_LE32 ||
927             ext_prop->type == USB_EXT_PROP_BE32) &&
928             (type == USB_EXT_PROP_UNICODE ||
929             type == USB_EXT_PROP_UNICODE_ENV ||
930             type == USB_EXT_PROP_UNICODE_LINK))
931                 ext_prop->data_len <<= 1;
932         else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
933                    ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
934                    ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
935                    (type == USB_EXT_PROP_BINARY ||
936                    type == USB_EXT_PROP_LE32 ||
937                    type == USB_EXT_PROP_BE32))
938                 ext_prop->data_len >>= 1;
939         ext_prop->type = type;
940         ret = len;
941
942 end:
943         if (desc->opts_mutex)
944                 mutex_unlock(desc->opts_mutex);
945         return ret;
946 }
947
948 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
949 {
950         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
951         int len = ext_prop->data_len;
952
953         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
954             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
955             ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
956                 len >>= 1;
957         memcpy(page, ext_prop->data, len);
958
959         return len;
960 }
961
962 static ssize_t ext_prop_data_store(struct config_item *item,
963                                    const char *page, size_t len)
964 {
965         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
966         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
967         char *new_data;
968         size_t ret_len = len;
969
970         if (page[len - 1] == '\n' || page[len - 1] == '\0')
971                 --len;
972         new_data = kmemdup(page, len, GFP_KERNEL);
973         if (!new_data)
974                 return -ENOMEM;
975
976         if (desc->opts_mutex)
977                 mutex_lock(desc->opts_mutex);
978         kfree(ext_prop->data);
979         ext_prop->data = new_data;
980         desc->ext_prop_len -= ext_prop->data_len;
981         ext_prop->data_len = len;
982         desc->ext_prop_len += ext_prop->data_len;
983         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
984             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
985             ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
986                 desc->ext_prop_len -= ext_prop->data_len;
987                 ext_prop->data_len <<= 1;
988                 ext_prop->data_len += 2;
989                 desc->ext_prop_len += ext_prop->data_len;
990         }
991         if (desc->opts_mutex)
992                 mutex_unlock(desc->opts_mutex);
993         return ret_len;
994 }
995
996 CONFIGFS_ATTR(ext_prop_, type);
997 CONFIGFS_ATTR(ext_prop_, data);
998
999 static struct configfs_attribute *ext_prop_attrs[] = {
1000         &ext_prop_attr_type,
1001         &ext_prop_attr_data,
1002         NULL,
1003 };
1004
1005 static void usb_os_desc_ext_prop_release(struct config_item *item)
1006 {
1007         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1008
1009         kfree(ext_prop); /* frees a whole chunk */
1010 }
1011
1012 static struct configfs_item_operations ext_prop_ops = {
1013         .release                = usb_os_desc_ext_prop_release,
1014 };
1015
1016 static struct config_item *ext_prop_make(
1017                 struct config_group *group,
1018                 const char *name)
1019 {
1020         struct usb_os_desc_ext_prop *ext_prop;
1021         struct config_item_type *ext_prop_type;
1022         struct usb_os_desc *desc;
1023         char *vlabuf;
1024
1025         vla_group(data_chunk);
1026         vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1027         vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1028
1029         vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1030         if (!vlabuf)
1031                 return ERR_PTR(-ENOMEM);
1032
1033         ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1034         ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1035
1036         desc = container_of(group, struct usb_os_desc, group);
1037         ext_prop_type->ct_item_ops = &ext_prop_ops;
1038         ext_prop_type->ct_attrs = ext_prop_attrs;
1039         ext_prop_type->ct_owner = desc->owner;
1040
1041         config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1042
1043         ext_prop->name = kstrdup(name, GFP_KERNEL);
1044         if (!ext_prop->name) {
1045                 kfree(vlabuf);
1046                 return ERR_PTR(-ENOMEM);
1047         }
1048         desc->ext_prop_len += 14;
1049         ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1050         if (desc->opts_mutex)
1051                 mutex_lock(desc->opts_mutex);
1052         desc->ext_prop_len += ext_prop->name_len;
1053         list_add_tail(&ext_prop->entry, &desc->ext_prop);
1054         ++desc->ext_prop_count;
1055         if (desc->opts_mutex)
1056                 mutex_unlock(desc->opts_mutex);
1057
1058         return &ext_prop->item;
1059 }
1060
1061 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1062 {
1063         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1064         struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1065
1066         if (desc->opts_mutex)
1067                 mutex_lock(desc->opts_mutex);
1068         list_del(&ext_prop->entry);
1069         --desc->ext_prop_count;
1070         kfree(ext_prop->name);
1071         desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1072         if (desc->opts_mutex)
1073                 mutex_unlock(desc->opts_mutex);
1074         config_item_put(item);
1075 }
1076
1077 static struct configfs_group_operations interf_grp_ops = {
1078         .make_item      = &ext_prop_make,
1079         .drop_item      = &ext_prop_drop,
1080 };
1081
1082 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1083                                              char *page)
1084 {
1085         memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1086         return 8;
1087 }
1088
1089 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1090                                               const char *page, size_t len)
1091 {
1092         struct usb_os_desc *desc = to_usb_os_desc(item);
1093         int l;
1094
1095         l = min_t(int, 8, len);
1096         if (page[l - 1] == '\n')
1097                 --l;
1098         if (desc->opts_mutex)
1099                 mutex_lock(desc->opts_mutex);
1100         memcpy(desc->ext_compat_id, page, l);
1101
1102         if (desc->opts_mutex)
1103                 mutex_unlock(desc->opts_mutex);
1104
1105         return len;
1106 }
1107
1108 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1109                                                  char *page)
1110 {
1111         memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1112         return 8;
1113 }
1114
1115 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1116                                                   const char *page, size_t len)
1117 {
1118         struct usb_os_desc *desc = to_usb_os_desc(item);
1119         int l;
1120
1121         l = min_t(int, 8, len);
1122         if (page[l - 1] == '\n')
1123                 --l;
1124         if (desc->opts_mutex)
1125                 mutex_lock(desc->opts_mutex);
1126         memcpy(desc->ext_compat_id + 8, page, l);
1127
1128         if (desc->opts_mutex)
1129                 mutex_unlock(desc->opts_mutex);
1130
1131         return len;
1132 }
1133
1134 CONFIGFS_ATTR(interf_grp_, compatible_id);
1135 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1136
1137 static struct configfs_attribute *interf_grp_attrs[] = {
1138         &interf_grp_attr_compatible_id,
1139         &interf_grp_attr_sub_compatible_id,
1140         NULL
1141 };
1142
1143 int usb_os_desc_prepare_interf_dir(struct config_group *parent,
1144                                    int n_interf,
1145                                    struct usb_os_desc **desc,
1146                                    char **names,
1147                                    struct module *owner)
1148 {
1149         struct config_group **f_default_groups, *os_desc_group,
1150                                 **interface_groups;
1151         struct config_item_type *os_desc_type, *interface_type;
1152
1153         vla_group(data_chunk);
1154         vla_item(data_chunk, struct config_group *, f_default_groups, 2);
1155         vla_item(data_chunk, struct config_group, os_desc_group, 1);
1156         vla_item(data_chunk, struct config_group *, interface_groups,
1157                  n_interf + 1);
1158         vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1159         vla_item(data_chunk, struct config_item_type, interface_type, 1);
1160
1161         char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1162         if (!vlabuf)
1163                 return -ENOMEM;
1164
1165         f_default_groups = vla_ptr(vlabuf, data_chunk, f_default_groups);
1166         os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1167         os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1168         interface_groups = vla_ptr(vlabuf, data_chunk, interface_groups);
1169         interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1170
1171         parent->default_groups = f_default_groups;
1172         os_desc_type->ct_owner = owner;
1173         config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1174         f_default_groups[0] = os_desc_group;
1175
1176         os_desc_group->default_groups = interface_groups;
1177         interface_type->ct_group_ops = &interf_grp_ops;
1178         interface_type->ct_attrs = interf_grp_attrs;
1179         interface_type->ct_owner = owner;
1180
1181         while (n_interf--) {
1182                 struct usb_os_desc *d;
1183
1184                 d = desc[n_interf];
1185                 d->owner = owner;
1186                 config_group_init_type_name(&d->group, "", interface_type);
1187                 config_item_set_name(&d->group.cg_item, "interface.%s",
1188                                      names[n_interf]);
1189                 interface_groups[n_interf] = &d->group;
1190         }
1191
1192         return 0;
1193 }
1194 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1195
1196 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1197 {
1198         WARN_ON(1);
1199         return -EINVAL;
1200 }
1201
1202 int composite_dev_prepare(struct usb_composite_driver *composite,
1203                 struct usb_composite_dev *dev);
1204
1205 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1206                                   struct usb_ep *ep0);
1207
1208 static void purge_configs_funcs(struct gadget_info *gi)
1209 {
1210         struct usb_configuration        *c;
1211
1212         list_for_each_entry(c, &gi->cdev.configs, list) {
1213                 struct usb_function *f, *tmp;
1214                 struct config_usb_cfg *cfg;
1215
1216                 cfg = container_of(c, struct config_usb_cfg, c);
1217
1218                 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1219
1220                         list_move_tail(&f->list, &cfg->func_list);
1221                         if (f->unbind) {
1222                                 dev_err(&gi->cdev.gadget->dev, "unbind function"
1223                                                 " '%s'/%p\n", f->name, f);
1224                                 f->unbind(c, f);
1225                         }
1226                 }
1227                 c->next_interface_id = 0;
1228                 memset(c->interface, 0, sizeof(c->interface));
1229                 c->superspeed = 0;
1230                 c->highspeed = 0;
1231                 c->fullspeed = 0;
1232         }
1233 }
1234
1235 static int configfs_composite_bind(struct usb_gadget *gadget,
1236                 struct usb_gadget_driver *gdriver)
1237 {
1238         struct usb_composite_driver     *composite = to_cdriver(gdriver);
1239         struct gadget_info              *gi = container_of(composite,
1240                                                 struct gadget_info, composite);
1241         struct usb_composite_dev        *cdev = &gi->cdev;
1242         struct usb_configuration        *c;
1243         struct usb_string               *s;
1244         unsigned                        i;
1245         int                             ret;
1246
1247         /* the gi->lock is hold by the caller */
1248         cdev->gadget = gadget;
1249         set_gadget_data(gadget, cdev);
1250         ret = composite_dev_prepare(composite, cdev);
1251         if (ret)
1252                 return ret;
1253         /* and now the gadget bind */
1254         ret = -EINVAL;
1255
1256         if (list_empty(&gi->cdev.configs)) {
1257                 pr_err("Need at least one configuration in %s.\n",
1258                                 gi->composite.name);
1259                 goto err_comp_cleanup;
1260         }
1261
1262
1263         list_for_each_entry(c, &gi->cdev.configs, list) {
1264                 struct config_usb_cfg *cfg;
1265
1266                 cfg = container_of(c, struct config_usb_cfg, c);
1267                 if (list_empty(&cfg->func_list)) {
1268                         pr_err("Config %s/%d of %s needs at least one function.\n",
1269                               c->label, c->bConfigurationValue,
1270                               gi->composite.name);
1271                         goto err_comp_cleanup;
1272                 }
1273         }
1274
1275         /* init all strings */
1276         if (!list_empty(&gi->string_list)) {
1277                 struct gadget_strings *gs;
1278
1279                 i = 0;
1280                 list_for_each_entry(gs, &gi->string_list, list) {
1281
1282                         gi->gstrings[i] = &gs->stringtab_dev;
1283                         gs->stringtab_dev.strings = gs->strings;
1284                         gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1285                                 gs->manufacturer;
1286                         gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1287                         gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1288                         i++;
1289                 }
1290                 gi->gstrings[i] = NULL;
1291                 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1292                                 USB_GADGET_FIRST_AVAIL_IDX);
1293                 if (IS_ERR(s)) {
1294                         ret = PTR_ERR(s);
1295                         goto err_comp_cleanup;
1296                 }
1297
1298                 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1299                 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1300                 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1301         }
1302
1303         if (gi->use_os_desc) {
1304                 cdev->use_os_string = true;
1305                 cdev->b_vendor_code = gi->b_vendor_code;
1306                 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1307         }
1308
1309         if (gadget_is_otg(gadget) && !otg_desc[0]) {
1310                 struct usb_descriptor_header *usb_desc;
1311
1312                 usb_desc = usb_otg_descriptor_alloc(gadget);
1313                 if (!usb_desc) {
1314                         ret = -ENOMEM;
1315                         goto err_comp_cleanup;
1316                 }
1317                 usb_otg_descriptor_init(gadget, usb_desc);
1318                 otg_desc[0] = usb_desc;
1319                 otg_desc[1] = NULL;
1320         }
1321
1322         /* Go through all configs, attach all functions */
1323         list_for_each_entry(c, &gi->cdev.configs, list) {
1324                 struct config_usb_cfg *cfg;
1325                 struct usb_function *f;
1326                 struct usb_function *tmp;
1327                 struct gadget_config_name *cn;
1328
1329                 if (gadget_is_otg(gadget))
1330                         c->descriptors = otg_desc;
1331
1332                 cfg = container_of(c, struct config_usb_cfg, c);
1333                 if (!list_empty(&cfg->string_list)) {
1334                         i = 0;
1335                         list_for_each_entry(cn, &cfg->string_list, list) {
1336                                 cfg->gstrings[i] = &cn->stringtab_dev;
1337                                 cn->stringtab_dev.strings = &cn->strings;
1338                                 cn->strings.s = cn->configuration;
1339                                 i++;
1340                         }
1341                         cfg->gstrings[i] = NULL;
1342                         s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1343                         if (IS_ERR(s)) {
1344                                 ret = PTR_ERR(s);
1345                                 goto err_comp_cleanup;
1346                         }
1347                         c->iConfiguration = s[0].id;
1348                 }
1349
1350                 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1351                         list_del(&f->list);
1352                         ret = usb_add_function(c, f);
1353                         if (ret) {
1354                                 list_add(&f->list, &cfg->func_list);
1355                                 goto err_purge_funcs;
1356                         }
1357                 }
1358                 usb_ep_autoconfig_reset(cdev->gadget);
1359         }
1360         if (cdev->use_os_string) {
1361                 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1362                 if (ret)
1363                         goto err_purge_funcs;
1364         }
1365
1366         usb_ep_autoconfig_reset(cdev->gadget);
1367         return 0;
1368
1369 err_purge_funcs:
1370         purge_configs_funcs(gi);
1371 err_comp_cleanup:
1372         composite_dev_cleanup(cdev);
1373         return ret;
1374 }
1375
1376 static void configfs_composite_unbind(struct usb_gadget *gadget)
1377 {
1378         struct usb_composite_dev        *cdev;
1379         struct gadget_info              *gi;
1380
1381         /* the gi->lock is hold by the caller */
1382
1383         cdev = get_gadget_data(gadget);
1384         gi = container_of(cdev, struct gadget_info, cdev);
1385
1386         kfree(otg_desc[0]);
1387         otg_desc[0] = NULL;
1388         purge_configs_funcs(gi);
1389         composite_dev_cleanup(cdev);
1390         usb_ep_autoconfig_reset(cdev->gadget);
1391         cdev->gadget = NULL;
1392         set_gadget_data(gadget, NULL);
1393 }
1394
1395 static const struct usb_gadget_driver configfs_driver_template = {
1396         .bind           = configfs_composite_bind,
1397         .unbind         = configfs_composite_unbind,
1398
1399         .setup          = composite_setup,
1400         .reset          = composite_disconnect,
1401         .disconnect     = composite_disconnect,
1402
1403         .suspend        = composite_suspend,
1404         .resume         = composite_resume,
1405
1406         .max_speed      = USB_SPEED_SUPER,
1407         .driver = {
1408                 .owner          = THIS_MODULE,
1409                 .name           = "configfs-gadget",
1410         },
1411 };
1412
1413 static struct config_group *gadgets_make(
1414                 struct config_group *group,
1415                 const char *name)
1416 {
1417         struct gadget_info *gi;
1418
1419         gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1420         if (!gi)
1421                 return ERR_PTR(-ENOMEM);
1422
1423         gi->group.default_groups = gi->default_groups;
1424         gi->group.default_groups[0] = &gi->functions_group;
1425         gi->group.default_groups[1] = &gi->configs_group;
1426         gi->group.default_groups[2] = &gi->strings_group;
1427         gi->group.default_groups[3] = &gi->os_desc_group;
1428
1429         config_group_init_type_name(&gi->functions_group, "functions",
1430                         &functions_type);
1431         config_group_init_type_name(&gi->configs_group, "configs",
1432                         &config_desc_type);
1433         config_group_init_type_name(&gi->strings_group, "strings",
1434                         &gadget_strings_strings_type);
1435         config_group_init_type_name(&gi->os_desc_group, "os_desc",
1436                         &os_desc_type);
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         config_group_init_type_name(&gi->group, name,
1462                                 &gadget_root_type);
1463         return &gi->group;
1464 err:
1465         kfree(gi);
1466         return ERR_PTR(-ENOMEM);
1467 }
1468
1469 static void gadgets_drop(struct config_group *group, struct config_item *item)
1470 {
1471         config_item_put(item);
1472 }
1473
1474 static struct configfs_group_operations gadgets_ops = {
1475         .make_group     = &gadgets_make,
1476         .drop_item      = &gadgets_drop,
1477 };
1478
1479 static struct config_item_type gadgets_type = {
1480         .ct_group_ops   = &gadgets_ops,
1481         .ct_owner       = THIS_MODULE,
1482 };
1483
1484 static struct configfs_subsystem gadget_subsys = {
1485         .su_group = {
1486                 .cg_item = {
1487                         .ci_namebuf = "usb_gadget",
1488                         .ci_type = &gadgets_type,
1489                 },
1490         },
1491         .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1492 };
1493
1494 void unregister_gadget_item(struct config_item *item)
1495 {
1496         struct gadget_info *gi = to_gadget_info(item);
1497
1498         unregister_gadget(gi);
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);