Merge tag 'for-5.12-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[linux-2.6-microblaze.git] / drivers / usb / gadget / configfs.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/configfs.h>
3 #include <linux/module.h>
4 #include <linux/slab.h>
5 #include <linux/device.h>
6 #include <linux/nls.h>
7 #include <linux/usb/composite.h>
8 #include <linux/usb/gadget_configfs.h>
9 #include "configfs.h"
10 #include "u_f.h"
11 #include "u_os_desc.h"
12
13 int check_user_usb_string(const char *name,
14                 struct usb_gadget_strings *stringtab_dev)
15 {
16         u16 num;
17         int ret;
18
19         ret = kstrtou16(name, 0, &num);
20         if (ret)
21                 return ret;
22
23         if (!usb_validate_langid(num))
24                 return -EINVAL;
25
26         stringtab_dev->language = num;
27         return 0;
28 }
29
30 #define MAX_NAME_LEN    40
31 #define MAX_USB_STRING_LANGS 2
32
33 static const struct usb_descriptor_header *otg_desc[2];
34
35 struct gadget_info {
36         struct config_group group;
37         struct config_group functions_group;
38         struct config_group configs_group;
39         struct config_group strings_group;
40         struct config_group os_desc_group;
41
42         struct mutex lock;
43         struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
44         struct list_head string_list;
45         struct list_head available_func;
46
47         struct usb_composite_driver composite;
48         struct usb_composite_dev cdev;
49         bool use_os_desc;
50         char b_vendor_code;
51         char qw_sign[OS_STRING_QW_SIGN_LEN];
52         spinlock_t spinlock;
53         bool unbind;
54 };
55
56 static inline struct gadget_info *to_gadget_info(struct config_item *item)
57 {
58          return container_of(to_config_group(item), struct gadget_info, group);
59 }
60
61 struct config_usb_cfg {
62         struct config_group group;
63         struct config_group strings_group;
64         struct list_head string_list;
65         struct usb_configuration c;
66         struct list_head func_list;
67         struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
68 };
69
70 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
71 {
72         return container_of(to_config_group(item), struct config_usb_cfg,
73                         group);
74 }
75
76 struct gadget_strings {
77         struct usb_gadget_strings stringtab_dev;
78         struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
79         char *manufacturer;
80         char *product;
81         char *serialnumber;
82
83         struct config_group group;
84         struct list_head list;
85 };
86
87 struct os_desc {
88         struct config_group group;
89 };
90
91 struct gadget_config_name {
92         struct usb_gadget_strings stringtab_dev;
93         struct usb_string strings;
94         char *configuration;
95
96         struct config_group group;
97         struct list_head list;
98 };
99
100 static int usb_string_copy(const char *s, char **s_copy)
101 {
102         int ret;
103         char *str;
104         char *copy = *s_copy;
105         ret = strlen(s);
106         if (ret > USB_MAX_STRING_LEN)
107                 return -EOVERFLOW;
108
109         str = kstrdup(s, GFP_KERNEL);
110         if (!str)
111                 return -ENOMEM;
112         if (str[ret - 1] == '\n')
113                 str[ret - 1] = '\0';
114         kfree(copy);
115         *s_copy = str;
116         return 0;
117 }
118
119 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name)      \
120 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
121                         char *page)     \
122 {       \
123         return sprintf(page, "0x%02x\n", \
124                 to_gadget_info(item)->cdev.desc.__name); \
125 }
126
127 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name)     \
128 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
129                         char *page)     \
130 {       \
131         return sprintf(page, "0x%04x\n", \
132                 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
133 }
134
135
136 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name)               \
137 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
138                 const char *page, size_t len)           \
139 {                                                       \
140         u8 val;                                         \
141         int ret;                                        \
142         ret = kstrtou8(page, 0, &val);                  \
143         if (ret)                                        \
144                 return ret;                             \
145         to_gadget_info(item)->cdev.desc._name = val;    \
146         return len;                                     \
147 }
148
149 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name)      \
150 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
151                 const char *page, size_t len)           \
152 {                                                       \
153         u16 val;                                        \
154         int ret;                                        \
155         ret = kstrtou16(page, 0, &val);                 \
156         if (ret)                                        \
157                 return ret;                             \
158         to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val);     \
159         return len;                                     \
160 }
161
162 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type)  \
163         GI_DEVICE_DESC_SIMPLE_R_##_type(_name)  \
164         GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
165
166 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
167 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
168 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
169 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
170 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
171 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
172 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
173 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
174
175 static ssize_t is_valid_bcd(u16 bcd_val)
176 {
177         if ((bcd_val & 0xf) > 9)
178                 return -EINVAL;
179         if (((bcd_val >> 4) & 0xf) > 9)
180                 return -EINVAL;
181         if (((bcd_val >> 8) & 0xf) > 9)
182                 return -EINVAL;
183         if (((bcd_val >> 12) & 0xf) > 9)
184                 return -EINVAL;
185         return 0;
186 }
187
188 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
189                 const char *page, size_t len)
190 {
191         u16 bcdDevice;
192         int ret;
193
194         ret = kstrtou16(page, 0, &bcdDevice);
195         if (ret)
196                 return ret;
197         ret = is_valid_bcd(bcdDevice);
198         if (ret)
199                 return ret;
200
201         to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
202         return len;
203 }
204
205 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
206                 const char *page, size_t len)
207 {
208         u16 bcdUSB;
209         int ret;
210
211         ret = kstrtou16(page, 0, &bcdUSB);
212         if (ret)
213                 return ret;
214         ret = is_valid_bcd(bcdUSB);
215         if (ret)
216                 return ret;
217
218         to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
219         return len;
220 }
221
222 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
223 {
224         struct gadget_info *gi = to_gadget_info(item);
225         char *udc_name;
226         int ret;
227
228         mutex_lock(&gi->lock);
229         udc_name = gi->composite.gadget_driver.udc_name;
230         ret = sprintf(page, "%s\n", udc_name ?: "");
231         mutex_unlock(&gi->lock);
232
233         return ret;
234 }
235
236 static int unregister_gadget(struct gadget_info *gi)
237 {
238         int ret;
239
240         if (!gi->composite.gadget_driver.udc_name)
241                 return -ENODEV;
242
243         ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
244         if (ret)
245                 return ret;
246         kfree(gi->composite.gadget_driver.udc_name);
247         gi->composite.gadget_driver.udc_name = NULL;
248         return 0;
249 }
250
251 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
252                 const char *page, size_t len)
253 {
254         struct gadget_info *gi = to_gadget_info(item);
255         char *name;
256         int ret;
257
258         if (strlen(page) < len)
259                 return -EOVERFLOW;
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                 kfree(name);
274         } else {
275                 if (gi->composite.gadget_driver.udc_name) {
276                         ret = -EBUSY;
277                         goto err;
278                 }
279                 gi->composite.gadget_driver.udc_name = name;
280                 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
281                 if (ret) {
282                         gi->composite.gadget_driver.udc_name = NULL;
283                         goto err;
284                 }
285         }
286         mutex_unlock(&gi->lock);
287         return len;
288 err:
289         kfree(name);
290         mutex_unlock(&gi->lock);
291         return ret;
292 }
293
294 static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
295                                               char *page)
296 {
297         enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
298
299         return sprintf(page, "%s\n", usb_speed_string(speed));
300 }
301
302 static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
303                                                const char *page, size_t len)
304 {
305         struct gadget_info *gi = to_gadget_info(item);
306
307         mutex_lock(&gi->lock);
308
309         /* Prevent changing of max_speed after the driver is binded */
310         if (gi->composite.gadget_driver.udc_name)
311                 goto err;
312
313         if (strncmp(page, "super-speed-plus", 16) == 0)
314                 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
315         else if (strncmp(page, "super-speed", 11) == 0)
316                 gi->composite.max_speed = USB_SPEED_SUPER;
317         else if (strncmp(page, "high-speed", 10) == 0)
318                 gi->composite.max_speed = USB_SPEED_HIGH;
319         else if (strncmp(page, "full-speed", 10) == 0)
320                 gi->composite.max_speed = USB_SPEED_FULL;
321         else if (strncmp(page, "low-speed", 9) == 0)
322                 gi->composite.max_speed = USB_SPEED_LOW;
323         else
324                 goto err;
325
326         gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
327
328         mutex_unlock(&gi->lock);
329         return len;
330 err:
331         mutex_unlock(&gi->lock);
332         return -EINVAL;
333 }
334
335 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
336 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
337 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
338 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
339 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
340 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
341 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
342 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
343 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
344 CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
345
346 static struct configfs_attribute *gadget_root_attrs[] = {
347         &gadget_dev_desc_attr_bDeviceClass,
348         &gadget_dev_desc_attr_bDeviceSubClass,
349         &gadget_dev_desc_attr_bDeviceProtocol,
350         &gadget_dev_desc_attr_bMaxPacketSize0,
351         &gadget_dev_desc_attr_idVendor,
352         &gadget_dev_desc_attr_idProduct,
353         &gadget_dev_desc_attr_bcdDevice,
354         &gadget_dev_desc_attr_bcdUSB,
355         &gadget_dev_desc_attr_UDC,
356         &gadget_dev_desc_attr_max_speed,
357         NULL,
358 };
359
360 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
361 {
362          return container_of(to_config_group(item), struct gadget_strings,
363                          group);
364 }
365
366 static inline struct gadget_config_name *to_gadget_config_name(
367                 struct config_item *item)
368 {
369          return container_of(to_config_group(item), struct gadget_config_name,
370                          group);
371 }
372
373 static inline struct usb_function_instance *to_usb_function_instance(
374                 struct config_item *item)
375 {
376          return container_of(to_config_group(item),
377                          struct usb_function_instance, group);
378 }
379
380 static void gadget_info_attr_release(struct config_item *item)
381 {
382         struct gadget_info *gi = to_gadget_info(item);
383
384         WARN_ON(!list_empty(&gi->cdev.configs));
385         WARN_ON(!list_empty(&gi->string_list));
386         WARN_ON(!list_empty(&gi->available_func));
387         kfree(gi->composite.gadget_driver.function);
388         kfree(gi);
389 }
390
391 static struct configfs_item_operations gadget_root_item_ops = {
392         .release                = gadget_info_attr_release,
393 };
394
395 static void gadget_config_attr_release(struct config_item *item)
396 {
397         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
398
399         WARN_ON(!list_empty(&cfg->c.functions));
400         list_del(&cfg->c.list);
401         kfree(cfg->c.label);
402         kfree(cfg);
403 }
404
405 static int config_usb_cfg_link(
406         struct config_item *usb_cfg_ci,
407         struct config_item *usb_func_ci)
408 {
409         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
410         struct usb_composite_dev *cdev = cfg->c.cdev;
411         struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
412
413         struct config_group *group = to_config_group(usb_func_ci);
414         struct usb_function_instance *fi = container_of(group,
415                         struct usb_function_instance, group);
416         struct usb_function_instance *a_fi;
417         struct usb_function *f;
418         int ret;
419
420         mutex_lock(&gi->lock);
421         /*
422          * Make sure this function is from within our _this_ gadget and not
423          * from another gadget or a random directory.
424          * Also a function instance can only be linked once.
425          */
426         list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
427                 if (a_fi == fi)
428                         break;
429         }
430         if (a_fi != fi) {
431                 ret = -EINVAL;
432                 goto out;
433         }
434
435         list_for_each_entry(f, &cfg->func_list, list) {
436                 if (f->fi == fi) {
437                         ret = -EEXIST;
438                         goto out;
439                 }
440         }
441
442         f = usb_get_function(fi);
443         if (IS_ERR(f)) {
444                 ret = PTR_ERR(f);
445                 goto out;
446         }
447
448         /* stash the function until we bind it to the gadget */
449         list_add_tail(&f->list, &cfg->func_list);
450         ret = 0;
451 out:
452         mutex_unlock(&gi->lock);
453         return ret;
454 }
455
456 static void config_usb_cfg_unlink(
457         struct config_item *usb_cfg_ci,
458         struct config_item *usb_func_ci)
459 {
460         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
461         struct usb_composite_dev *cdev = cfg->c.cdev;
462         struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
463
464         struct config_group *group = to_config_group(usb_func_ci);
465         struct usb_function_instance *fi = container_of(group,
466                         struct usb_function_instance, group);
467         struct usb_function *f;
468
469         /*
470          * ideally I would like to forbid to unlink functions while a gadget is
471          * bound to an UDC. Since this isn't possible at the moment, we simply
472          * force an unbind, the function is available here and then we can
473          * remove the function.
474          */
475         mutex_lock(&gi->lock);
476         if (gi->composite.gadget_driver.udc_name)
477                 unregister_gadget(gi);
478         WARN_ON(gi->composite.gadget_driver.udc_name);
479
480         list_for_each_entry(f, &cfg->func_list, list) {
481                 if (f->fi == fi) {
482                         list_del(&f->list);
483                         usb_put_function(f);
484                         mutex_unlock(&gi->lock);
485                         return;
486                 }
487         }
488         mutex_unlock(&gi->lock);
489         WARN(1, "Unable to locate function to unbind\n");
490 }
491
492 static struct configfs_item_operations gadget_config_item_ops = {
493         .release                = gadget_config_attr_release,
494         .allow_link             = config_usb_cfg_link,
495         .drop_link              = config_usb_cfg_unlink,
496 };
497
498
499 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
500                 char *page)
501 {
502         return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
503 }
504
505 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
506                 const char *page, size_t len)
507 {
508         u16 val;
509         int ret;
510         ret = kstrtou16(page, 0, &val);
511         if (ret)
512                 return ret;
513         if (DIV_ROUND_UP(val, 8) > 0xff)
514                 return -ERANGE;
515         to_config_usb_cfg(item)->c.MaxPower = val;
516         return len;
517 }
518
519 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
520                 char *page)
521 {
522         return sprintf(page, "0x%02x\n",
523                 to_config_usb_cfg(item)->c.bmAttributes);
524 }
525
526 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
527                 const char *page, size_t len)
528 {
529         u8 val;
530         int ret;
531         ret = kstrtou8(page, 0, &val);
532         if (ret)
533                 return ret;
534         if (!(val & USB_CONFIG_ATT_ONE))
535                 return -EINVAL;
536         if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
537                                 USB_CONFIG_ATT_WAKEUP))
538                 return -EINVAL;
539         to_config_usb_cfg(item)->c.bmAttributes = val;
540         return len;
541 }
542
543 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
544 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
545
546 static struct configfs_attribute *gadget_config_attrs[] = {
547         &gadget_config_desc_attr_MaxPower,
548         &gadget_config_desc_attr_bmAttributes,
549         NULL,
550 };
551
552 static const struct config_item_type gadget_config_type = {
553         .ct_item_ops    = &gadget_config_item_ops,
554         .ct_attrs       = gadget_config_attrs,
555         .ct_owner       = THIS_MODULE,
556 };
557
558 static const struct config_item_type gadget_root_type = {
559         .ct_item_ops    = &gadget_root_item_ops,
560         .ct_attrs       = gadget_root_attrs,
561         .ct_owner       = THIS_MODULE,
562 };
563
564 static void composite_init_dev(struct usb_composite_dev *cdev)
565 {
566         spin_lock_init(&cdev->lock);
567         INIT_LIST_HEAD(&cdev->configs);
568         INIT_LIST_HEAD(&cdev->gstrings);
569 }
570
571 static struct config_group *function_make(
572                 struct config_group *group,
573                 const char *name)
574 {
575         struct gadget_info *gi;
576         struct usb_function_instance *fi;
577         char buf[MAX_NAME_LEN];
578         char *func_name;
579         char *instance_name;
580         int ret;
581
582         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
583         if (ret >= MAX_NAME_LEN)
584                 return ERR_PTR(-ENAMETOOLONG);
585
586         func_name = buf;
587         instance_name = strchr(func_name, '.');
588         if (!instance_name) {
589                 pr_err("Unable to locate . in FUNC.INSTANCE\n");
590                 return ERR_PTR(-EINVAL);
591         }
592         *instance_name = '\0';
593         instance_name++;
594
595         fi = usb_get_function_instance(func_name);
596         if (IS_ERR(fi))
597                 return ERR_CAST(fi);
598
599         ret = config_item_set_name(&fi->group.cg_item, "%s", name);
600         if (ret) {
601                 usb_put_function_instance(fi);
602                 return ERR_PTR(ret);
603         }
604         if (fi->set_inst_name) {
605                 ret = fi->set_inst_name(fi, instance_name);
606                 if (ret) {
607                         usb_put_function_instance(fi);
608                         return ERR_PTR(ret);
609                 }
610         }
611
612         gi = container_of(group, struct gadget_info, functions_group);
613
614         mutex_lock(&gi->lock);
615         list_add_tail(&fi->cfs_list, &gi->available_func);
616         mutex_unlock(&gi->lock);
617         return &fi->group;
618 }
619
620 static void function_drop(
621                 struct config_group *group,
622                 struct config_item *item)
623 {
624         struct usb_function_instance *fi = to_usb_function_instance(item);
625         struct gadget_info *gi;
626
627         gi = container_of(group, struct gadget_info, functions_group);
628
629         mutex_lock(&gi->lock);
630         list_del(&fi->cfs_list);
631         mutex_unlock(&gi->lock);
632         config_item_put(item);
633 }
634
635 static struct configfs_group_operations functions_ops = {
636         .make_group     = &function_make,
637         .drop_item      = &function_drop,
638 };
639
640 static const struct config_item_type functions_type = {
641         .ct_group_ops   = &functions_ops,
642         .ct_owner       = THIS_MODULE,
643 };
644
645 GS_STRINGS_RW(gadget_config_name, configuration);
646
647 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
648         &gadget_config_name_attr_configuration,
649         NULL,
650 };
651
652 static void gadget_config_name_attr_release(struct config_item *item)
653 {
654         struct gadget_config_name *cn = to_gadget_config_name(item);
655
656         kfree(cn->configuration);
657
658         list_del(&cn->list);
659         kfree(cn);
660 }
661
662 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
663 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
664
665 static struct config_group *config_desc_make(
666                 struct config_group *group,
667                 const char *name)
668 {
669         struct gadget_info *gi;
670         struct config_usb_cfg *cfg;
671         char buf[MAX_NAME_LEN];
672         char *num_str;
673         u8 num;
674         int ret;
675
676         gi = container_of(group, struct gadget_info, configs_group);
677         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
678         if (ret >= MAX_NAME_LEN)
679                 return ERR_PTR(-ENAMETOOLONG);
680
681         num_str = strchr(buf, '.');
682         if (!num_str) {
683                 pr_err("Unable to locate . in name.bConfigurationValue\n");
684                 return ERR_PTR(-EINVAL);
685         }
686
687         *num_str = '\0';
688         num_str++;
689
690         if (!strlen(buf))
691                 return ERR_PTR(-EINVAL);
692
693         ret = kstrtou8(num_str, 0, &num);
694         if (ret)
695                 return ERR_PTR(ret);
696
697         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
698         if (!cfg)
699                 return ERR_PTR(-ENOMEM);
700         cfg->c.label = kstrdup(buf, GFP_KERNEL);
701         if (!cfg->c.label) {
702                 ret = -ENOMEM;
703                 goto err;
704         }
705         cfg->c.bConfigurationValue = num;
706         cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
707         cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
708         INIT_LIST_HEAD(&cfg->string_list);
709         INIT_LIST_HEAD(&cfg->func_list);
710
711         config_group_init_type_name(&cfg->group, name,
712                                 &gadget_config_type);
713
714         config_group_init_type_name(&cfg->strings_group, "strings",
715                         &gadget_config_name_strings_type);
716         configfs_add_default_group(&cfg->strings_group, &cfg->group);
717
718         ret = usb_add_config_only(&gi->cdev, &cfg->c);
719         if (ret)
720                 goto err;
721
722         return &cfg->group;
723 err:
724         kfree(cfg->c.label);
725         kfree(cfg);
726         return ERR_PTR(ret);
727 }
728
729 static void config_desc_drop(
730                 struct config_group *group,
731                 struct config_item *item)
732 {
733         config_item_put(item);
734 }
735
736 static struct configfs_group_operations config_desc_ops = {
737         .make_group     = &config_desc_make,
738         .drop_item      = &config_desc_drop,
739 };
740
741 static const struct config_item_type config_desc_type = {
742         .ct_group_ops   = &config_desc_ops,
743         .ct_owner       = THIS_MODULE,
744 };
745
746 GS_STRINGS_RW(gadget_strings, manufacturer);
747 GS_STRINGS_RW(gadget_strings, product);
748 GS_STRINGS_RW(gadget_strings, serialnumber);
749
750 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
751         &gadget_strings_attr_manufacturer,
752         &gadget_strings_attr_product,
753         &gadget_strings_attr_serialnumber,
754         NULL,
755 };
756
757 static void gadget_strings_attr_release(struct config_item *item)
758 {
759         struct gadget_strings *gs = to_gadget_strings(item);
760
761         kfree(gs->manufacturer);
762         kfree(gs->product);
763         kfree(gs->serialnumber);
764
765         list_del(&gs->list);
766         kfree(gs);
767 }
768
769 USB_CONFIG_STRING_RW_OPS(gadget_strings);
770 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
771
772 static inline struct os_desc *to_os_desc(struct config_item *item)
773 {
774         return container_of(to_config_group(item), struct os_desc, group);
775 }
776
777 static inline struct gadget_info *os_desc_item_to_gadget_info(
778                 struct config_item *item)
779 {
780         return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
781 }
782
783 static ssize_t os_desc_use_show(struct config_item *item, char *page)
784 {
785         return sprintf(page, "%d\n",
786                         os_desc_item_to_gadget_info(item)->use_os_desc);
787 }
788
789 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
790                                  size_t len)
791 {
792         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
793         int ret;
794         bool use;
795
796         mutex_lock(&gi->lock);
797         ret = strtobool(page, &use);
798         if (!ret) {
799                 gi->use_os_desc = use;
800                 ret = len;
801         }
802         mutex_unlock(&gi->lock);
803
804         return ret;
805 }
806
807 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
808 {
809         return sprintf(page, "0x%02x\n",
810                         os_desc_item_to_gadget_info(item)->b_vendor_code);
811 }
812
813 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
814                                            const char *page, size_t len)
815 {
816         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
817         int ret;
818         u8 b_vendor_code;
819
820         mutex_lock(&gi->lock);
821         ret = kstrtou8(page, 0, &b_vendor_code);
822         if (!ret) {
823                 gi->b_vendor_code = b_vendor_code;
824                 ret = len;
825         }
826         mutex_unlock(&gi->lock);
827
828         return ret;
829 }
830
831 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
832 {
833         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
834         int res;
835
836         res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
837                               UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
838         page[res++] = '\n';
839
840         return res;
841 }
842
843 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
844                                      size_t len)
845 {
846         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
847         int res, l;
848
849         l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
850         if (page[l - 1] == '\n')
851                 --l;
852
853         mutex_lock(&gi->lock);
854         res = utf8s_to_utf16s(page, l,
855                               UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
856                               OS_STRING_QW_SIGN_LEN);
857         if (res > 0)
858                 res = len;
859         mutex_unlock(&gi->lock);
860
861         return res;
862 }
863
864 CONFIGFS_ATTR(os_desc_, use);
865 CONFIGFS_ATTR(os_desc_, b_vendor_code);
866 CONFIGFS_ATTR(os_desc_, qw_sign);
867
868 static struct configfs_attribute *os_desc_attrs[] = {
869         &os_desc_attr_use,
870         &os_desc_attr_b_vendor_code,
871         &os_desc_attr_qw_sign,
872         NULL,
873 };
874
875 static void os_desc_attr_release(struct config_item *item)
876 {
877         struct os_desc *os_desc = to_os_desc(item);
878         kfree(os_desc);
879 }
880
881 static int os_desc_link(struct config_item *os_desc_ci,
882                         struct config_item *usb_cfg_ci)
883 {
884         struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
885                                         struct gadget_info, os_desc_group);
886         struct usb_composite_dev *cdev = &gi->cdev;
887         struct config_usb_cfg *c_target =
888                 container_of(to_config_group(usb_cfg_ci),
889                              struct config_usb_cfg, group);
890         struct usb_configuration *c;
891         int ret;
892
893         mutex_lock(&gi->lock);
894         list_for_each_entry(c, &cdev->configs, list) {
895                 if (c == &c_target->c)
896                         break;
897         }
898         if (c != &c_target->c) {
899                 ret = -EINVAL;
900                 goto out;
901         }
902
903         if (cdev->os_desc_config) {
904                 ret = -EBUSY;
905                 goto out;
906         }
907
908         cdev->os_desc_config = &c_target->c;
909         ret = 0;
910
911 out:
912         mutex_unlock(&gi->lock);
913         return ret;
914 }
915
916 static void os_desc_unlink(struct config_item *os_desc_ci,
917                           struct config_item *usb_cfg_ci)
918 {
919         struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
920                                         struct gadget_info, os_desc_group);
921         struct usb_composite_dev *cdev = &gi->cdev;
922
923         mutex_lock(&gi->lock);
924         if (gi->composite.gadget_driver.udc_name)
925                 unregister_gadget(gi);
926         cdev->os_desc_config = NULL;
927         WARN_ON(gi->composite.gadget_driver.udc_name);
928         mutex_unlock(&gi->lock);
929 }
930
931 static struct configfs_item_operations os_desc_ops = {
932         .release                = os_desc_attr_release,
933         .allow_link             = os_desc_link,
934         .drop_link              = os_desc_unlink,
935 };
936
937 static struct config_item_type os_desc_type = {
938         .ct_item_ops    = &os_desc_ops,
939         .ct_attrs       = os_desc_attrs,
940         .ct_owner       = THIS_MODULE,
941 };
942
943 static inline struct usb_os_desc_ext_prop
944 *to_usb_os_desc_ext_prop(struct config_item *item)
945 {
946         return container_of(item, struct usb_os_desc_ext_prop, item);
947 }
948
949 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
950 {
951         return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
952 }
953
954 static ssize_t ext_prop_type_store(struct config_item *item,
955                                    const char *page, size_t len)
956 {
957         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
958         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
959         u8 type;
960         int ret;
961
962         if (desc->opts_mutex)
963                 mutex_lock(desc->opts_mutex);
964         ret = kstrtou8(page, 0, &type);
965         if (ret)
966                 goto end;
967         if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
968                 ret = -EINVAL;
969                 goto end;
970         }
971
972         if ((ext_prop->type == USB_EXT_PROP_BINARY ||
973             ext_prop->type == USB_EXT_PROP_LE32 ||
974             ext_prop->type == USB_EXT_PROP_BE32) &&
975             (type == USB_EXT_PROP_UNICODE ||
976             type == USB_EXT_PROP_UNICODE_ENV ||
977             type == USB_EXT_PROP_UNICODE_LINK))
978                 ext_prop->data_len <<= 1;
979         else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
980                    ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
981                    ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
982                    (type == USB_EXT_PROP_BINARY ||
983                    type == USB_EXT_PROP_LE32 ||
984                    type == USB_EXT_PROP_BE32))
985                 ext_prop->data_len >>= 1;
986         ext_prop->type = type;
987         ret = len;
988
989 end:
990         if (desc->opts_mutex)
991                 mutex_unlock(desc->opts_mutex);
992         return ret;
993 }
994
995 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
996 {
997         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
998         int len = ext_prop->data_len;
999
1000         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1001             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1002             ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1003                 len >>= 1;
1004         memcpy(page, ext_prop->data, len);
1005
1006         return len;
1007 }
1008
1009 static ssize_t ext_prop_data_store(struct config_item *item,
1010                                    const char *page, size_t len)
1011 {
1012         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1013         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1014         char *new_data;
1015         size_t ret_len = len;
1016
1017         if (page[len - 1] == '\n' || page[len - 1] == '\0')
1018                 --len;
1019         new_data = kmemdup(page, len, GFP_KERNEL);
1020         if (!new_data)
1021                 return -ENOMEM;
1022
1023         if (desc->opts_mutex)
1024                 mutex_lock(desc->opts_mutex);
1025         kfree(ext_prop->data);
1026         ext_prop->data = new_data;
1027         desc->ext_prop_len -= ext_prop->data_len;
1028         ext_prop->data_len = len;
1029         desc->ext_prop_len += ext_prop->data_len;
1030         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1031             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1032             ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1033                 desc->ext_prop_len -= ext_prop->data_len;
1034                 ext_prop->data_len <<= 1;
1035                 ext_prop->data_len += 2;
1036                 desc->ext_prop_len += ext_prop->data_len;
1037         }
1038         if (desc->opts_mutex)
1039                 mutex_unlock(desc->opts_mutex);
1040         return ret_len;
1041 }
1042
1043 CONFIGFS_ATTR(ext_prop_, type);
1044 CONFIGFS_ATTR(ext_prop_, data);
1045
1046 static struct configfs_attribute *ext_prop_attrs[] = {
1047         &ext_prop_attr_type,
1048         &ext_prop_attr_data,
1049         NULL,
1050 };
1051
1052 static void usb_os_desc_ext_prop_release(struct config_item *item)
1053 {
1054         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1055
1056         kfree(ext_prop); /* frees a whole chunk */
1057 }
1058
1059 static struct configfs_item_operations ext_prop_ops = {
1060         .release                = usb_os_desc_ext_prop_release,
1061 };
1062
1063 static struct config_item *ext_prop_make(
1064                 struct config_group *group,
1065                 const char *name)
1066 {
1067         struct usb_os_desc_ext_prop *ext_prop;
1068         struct config_item_type *ext_prop_type;
1069         struct usb_os_desc *desc;
1070         char *vlabuf;
1071
1072         vla_group(data_chunk);
1073         vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1074         vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1075
1076         vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1077         if (!vlabuf)
1078                 return ERR_PTR(-ENOMEM);
1079
1080         ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1081         ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1082
1083         desc = container_of(group, struct usb_os_desc, group);
1084         ext_prop_type->ct_item_ops = &ext_prop_ops;
1085         ext_prop_type->ct_attrs = ext_prop_attrs;
1086         ext_prop_type->ct_owner = desc->owner;
1087
1088         config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1089
1090         ext_prop->name = kstrdup(name, GFP_KERNEL);
1091         if (!ext_prop->name) {
1092                 kfree(vlabuf);
1093                 return ERR_PTR(-ENOMEM);
1094         }
1095         desc->ext_prop_len += 14;
1096         ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1097         if (desc->opts_mutex)
1098                 mutex_lock(desc->opts_mutex);
1099         desc->ext_prop_len += ext_prop->name_len;
1100         list_add_tail(&ext_prop->entry, &desc->ext_prop);
1101         ++desc->ext_prop_count;
1102         if (desc->opts_mutex)
1103                 mutex_unlock(desc->opts_mutex);
1104
1105         return &ext_prop->item;
1106 }
1107
1108 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1109 {
1110         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1111         struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1112
1113         if (desc->opts_mutex)
1114                 mutex_lock(desc->opts_mutex);
1115         list_del(&ext_prop->entry);
1116         --desc->ext_prop_count;
1117         kfree(ext_prop->name);
1118         desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1119         if (desc->opts_mutex)
1120                 mutex_unlock(desc->opts_mutex);
1121         config_item_put(item);
1122 }
1123
1124 static struct configfs_group_operations interf_grp_ops = {
1125         .make_item      = &ext_prop_make,
1126         .drop_item      = &ext_prop_drop,
1127 };
1128
1129 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1130                                              char *page)
1131 {
1132         memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1133         return 8;
1134 }
1135
1136 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1137                                               const char *page, size_t len)
1138 {
1139         struct usb_os_desc *desc = to_usb_os_desc(item);
1140         int l;
1141
1142         l = min_t(int, 8, len);
1143         if (page[l - 1] == '\n')
1144                 --l;
1145         if (desc->opts_mutex)
1146                 mutex_lock(desc->opts_mutex);
1147         memcpy(desc->ext_compat_id, page, l);
1148
1149         if (desc->opts_mutex)
1150                 mutex_unlock(desc->opts_mutex);
1151
1152         return len;
1153 }
1154
1155 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1156                                                  char *page)
1157 {
1158         memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1159         return 8;
1160 }
1161
1162 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1163                                                   const char *page, size_t len)
1164 {
1165         struct usb_os_desc *desc = to_usb_os_desc(item);
1166         int l;
1167
1168         l = min_t(int, 8, len);
1169         if (page[l - 1] == '\n')
1170                 --l;
1171         if (desc->opts_mutex)
1172                 mutex_lock(desc->opts_mutex);
1173         memcpy(desc->ext_compat_id + 8, page, l);
1174
1175         if (desc->opts_mutex)
1176                 mutex_unlock(desc->opts_mutex);
1177
1178         return len;
1179 }
1180
1181 CONFIGFS_ATTR(interf_grp_, compatible_id);
1182 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1183
1184 static struct configfs_attribute *interf_grp_attrs[] = {
1185         &interf_grp_attr_compatible_id,
1186         &interf_grp_attr_sub_compatible_id,
1187         NULL
1188 };
1189
1190 struct config_group *usb_os_desc_prepare_interf_dir(
1191                 struct config_group *parent,
1192                 int n_interf,
1193                 struct usb_os_desc **desc,
1194                 char **names,
1195                 struct module *owner)
1196 {
1197         struct config_group *os_desc_group;
1198         struct config_item_type *os_desc_type, *interface_type;
1199
1200         vla_group(data_chunk);
1201         vla_item(data_chunk, struct config_group, os_desc_group, 1);
1202         vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1203         vla_item(data_chunk, struct config_item_type, interface_type, 1);
1204
1205         char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1206         if (!vlabuf)
1207                 return ERR_PTR(-ENOMEM);
1208
1209         os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1210         os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1211         interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1212
1213         os_desc_type->ct_owner = owner;
1214         config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1215         configfs_add_default_group(os_desc_group, parent);
1216
1217         interface_type->ct_group_ops = &interf_grp_ops;
1218         interface_type->ct_attrs = interf_grp_attrs;
1219         interface_type->ct_owner = owner;
1220
1221         while (n_interf--) {
1222                 struct usb_os_desc *d;
1223
1224                 d = desc[n_interf];
1225                 d->owner = owner;
1226                 config_group_init_type_name(&d->group, "", interface_type);
1227                 config_item_set_name(&d->group.cg_item, "interface.%s",
1228                                      names[n_interf]);
1229                 configfs_add_default_group(&d->group, os_desc_group);
1230         }
1231
1232         return os_desc_group;
1233 }
1234 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1235
1236 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1237 {
1238         WARN_ON(1);
1239         return -EINVAL;
1240 }
1241
1242 int composite_dev_prepare(struct usb_composite_driver *composite,
1243                 struct usb_composite_dev *dev);
1244
1245 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1246                                   struct usb_ep *ep0);
1247
1248 static void purge_configs_funcs(struct gadget_info *gi)
1249 {
1250         struct usb_configuration        *c;
1251
1252         list_for_each_entry(c, &gi->cdev.configs, list) {
1253                 struct usb_function *f, *tmp;
1254                 struct config_usb_cfg *cfg;
1255
1256                 cfg = container_of(c, struct config_usb_cfg, c);
1257
1258                 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1259
1260                         list_move(&f->list, &cfg->func_list);
1261                         if (f->unbind) {
1262                                 dev_dbg(&gi->cdev.gadget->dev,
1263                                         "unbind function '%s'/%p\n",
1264                                         f->name, f);
1265                                 f->unbind(c, f);
1266                         }
1267                 }
1268                 c->next_interface_id = 0;
1269                 memset(c->interface, 0, sizeof(c->interface));
1270                 c->superspeed_plus = 0;
1271                 c->superspeed = 0;
1272                 c->highspeed = 0;
1273                 c->fullspeed = 0;
1274         }
1275 }
1276
1277 static int configfs_composite_bind(struct usb_gadget *gadget,
1278                 struct usb_gadget_driver *gdriver)
1279 {
1280         struct usb_composite_driver     *composite = to_cdriver(gdriver);
1281         struct gadget_info              *gi = container_of(composite,
1282                                                 struct gadget_info, composite);
1283         struct usb_composite_dev        *cdev = &gi->cdev;
1284         struct usb_configuration        *c;
1285         struct usb_string               *s;
1286         unsigned                        i;
1287         int                             ret;
1288
1289         /* the gi->lock is hold by the caller */
1290         gi->unbind = 0;
1291         cdev->gadget = gadget;
1292         set_gadget_data(gadget, cdev);
1293         ret = composite_dev_prepare(composite, cdev);
1294         if (ret)
1295                 return ret;
1296         /* and now the gadget bind */
1297         ret = -EINVAL;
1298
1299         if (list_empty(&gi->cdev.configs)) {
1300                 pr_err("Need at least one configuration in %s.\n",
1301                                 gi->composite.name);
1302                 goto err_comp_cleanup;
1303         }
1304
1305
1306         list_for_each_entry(c, &gi->cdev.configs, list) {
1307                 struct config_usb_cfg *cfg;
1308
1309                 cfg = container_of(c, struct config_usb_cfg, c);
1310                 if (list_empty(&cfg->func_list)) {
1311                         pr_err("Config %s/%d of %s needs at least one function.\n",
1312                               c->label, c->bConfigurationValue,
1313                               gi->composite.name);
1314                         goto err_comp_cleanup;
1315                 }
1316         }
1317
1318         /* init all strings */
1319         if (!list_empty(&gi->string_list)) {
1320                 struct gadget_strings *gs;
1321
1322                 i = 0;
1323                 list_for_each_entry(gs, &gi->string_list, list) {
1324
1325                         gi->gstrings[i] = &gs->stringtab_dev;
1326                         gs->stringtab_dev.strings = gs->strings;
1327                         gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1328                                 gs->manufacturer;
1329                         gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1330                         gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1331                         i++;
1332                 }
1333                 gi->gstrings[i] = NULL;
1334                 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1335                                 USB_GADGET_FIRST_AVAIL_IDX);
1336                 if (IS_ERR(s)) {
1337                         ret = PTR_ERR(s);
1338                         goto err_comp_cleanup;
1339                 }
1340
1341                 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1342                 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1343                 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1344         }
1345
1346         if (gi->use_os_desc) {
1347                 cdev->use_os_string = true;
1348                 cdev->b_vendor_code = gi->b_vendor_code;
1349                 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1350         }
1351
1352         if (gadget_is_otg(gadget) && !otg_desc[0]) {
1353                 struct usb_descriptor_header *usb_desc;
1354
1355                 usb_desc = usb_otg_descriptor_alloc(gadget);
1356                 if (!usb_desc) {
1357                         ret = -ENOMEM;
1358                         goto err_comp_cleanup;
1359                 }
1360                 usb_otg_descriptor_init(gadget, usb_desc);
1361                 otg_desc[0] = usb_desc;
1362                 otg_desc[1] = NULL;
1363         }
1364
1365         /* Go through all configs, attach all functions */
1366         list_for_each_entry(c, &gi->cdev.configs, list) {
1367                 struct config_usb_cfg *cfg;
1368                 struct usb_function *f;
1369                 struct usb_function *tmp;
1370                 struct gadget_config_name *cn;
1371
1372                 if (gadget_is_otg(gadget))
1373                         c->descriptors = otg_desc;
1374
1375                 cfg = container_of(c, struct config_usb_cfg, c);
1376                 if (!list_empty(&cfg->string_list)) {
1377                         i = 0;
1378                         list_for_each_entry(cn, &cfg->string_list, list) {
1379                                 cfg->gstrings[i] = &cn->stringtab_dev;
1380                                 cn->stringtab_dev.strings = &cn->strings;
1381                                 cn->strings.s = cn->configuration;
1382                                 i++;
1383                         }
1384                         cfg->gstrings[i] = NULL;
1385                         s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1386                         if (IS_ERR(s)) {
1387                                 ret = PTR_ERR(s);
1388                                 goto err_comp_cleanup;
1389                         }
1390                         c->iConfiguration = s[0].id;
1391                 }
1392
1393                 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1394                         list_del(&f->list);
1395                         ret = usb_add_function(c, f);
1396                         if (ret) {
1397                                 list_add(&f->list, &cfg->func_list);
1398                                 goto err_purge_funcs;
1399                         }
1400                 }
1401                 usb_ep_autoconfig_reset(cdev->gadget);
1402         }
1403         if (cdev->use_os_string) {
1404                 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1405                 if (ret)
1406                         goto err_purge_funcs;
1407         }
1408
1409         usb_ep_autoconfig_reset(cdev->gadget);
1410         return 0;
1411
1412 err_purge_funcs:
1413         purge_configs_funcs(gi);
1414 err_comp_cleanup:
1415         composite_dev_cleanup(cdev);
1416         return ret;
1417 }
1418
1419 static void configfs_composite_unbind(struct usb_gadget *gadget)
1420 {
1421         struct usb_composite_dev        *cdev;
1422         struct gadget_info              *gi;
1423         unsigned long flags;
1424
1425         /* the gi->lock is hold by the caller */
1426
1427         cdev = get_gadget_data(gadget);
1428         gi = container_of(cdev, struct gadget_info, cdev);
1429         spin_lock_irqsave(&gi->spinlock, flags);
1430         gi->unbind = 1;
1431         spin_unlock_irqrestore(&gi->spinlock, flags);
1432
1433         kfree(otg_desc[0]);
1434         otg_desc[0] = NULL;
1435         purge_configs_funcs(gi);
1436         composite_dev_cleanup(cdev);
1437         usb_ep_autoconfig_reset(cdev->gadget);
1438         spin_lock_irqsave(&gi->spinlock, flags);
1439         cdev->gadget = NULL;
1440         set_gadget_data(gadget, NULL);
1441         spin_unlock_irqrestore(&gi->spinlock, flags);
1442 }
1443
1444 static int configfs_composite_setup(struct usb_gadget *gadget,
1445                 const struct usb_ctrlrequest *ctrl)
1446 {
1447         struct usb_composite_dev *cdev;
1448         struct gadget_info *gi;
1449         unsigned long flags;
1450         int ret;
1451
1452         cdev = get_gadget_data(gadget);
1453         if (!cdev)
1454                 return 0;
1455
1456         gi = container_of(cdev, struct gadget_info, cdev);
1457         spin_lock_irqsave(&gi->spinlock, flags);
1458         cdev = get_gadget_data(gadget);
1459         if (!cdev || gi->unbind) {
1460                 spin_unlock_irqrestore(&gi->spinlock, flags);
1461                 return 0;
1462         }
1463
1464         ret = composite_setup(gadget, ctrl);
1465         spin_unlock_irqrestore(&gi->spinlock, flags);
1466         return ret;
1467 }
1468
1469 static void configfs_composite_disconnect(struct usb_gadget *gadget)
1470 {
1471         struct usb_composite_dev *cdev;
1472         struct gadget_info *gi;
1473         unsigned long flags;
1474
1475         cdev = get_gadget_data(gadget);
1476         if (!cdev)
1477                 return;
1478
1479         gi = container_of(cdev, struct gadget_info, cdev);
1480         spin_lock_irqsave(&gi->spinlock, flags);
1481         cdev = get_gadget_data(gadget);
1482         if (!cdev || gi->unbind) {
1483                 spin_unlock_irqrestore(&gi->spinlock, flags);
1484                 return;
1485         }
1486
1487         composite_disconnect(gadget);
1488         spin_unlock_irqrestore(&gi->spinlock, flags);
1489 }
1490
1491 static void configfs_composite_reset(struct usb_gadget *gadget)
1492 {
1493         struct usb_composite_dev *cdev;
1494         struct gadget_info *gi;
1495         unsigned long flags;
1496
1497         cdev = get_gadget_data(gadget);
1498         if (!cdev)
1499                 return;
1500
1501         gi = container_of(cdev, struct gadget_info, cdev);
1502         spin_lock_irqsave(&gi->spinlock, flags);
1503         cdev = get_gadget_data(gadget);
1504         if (!cdev || gi->unbind) {
1505                 spin_unlock_irqrestore(&gi->spinlock, flags);
1506                 return;
1507         }
1508
1509         composite_reset(gadget);
1510         spin_unlock_irqrestore(&gi->spinlock, flags);
1511 }
1512
1513 static void configfs_composite_suspend(struct usb_gadget *gadget)
1514 {
1515         struct usb_composite_dev *cdev;
1516         struct gadget_info *gi;
1517         unsigned long flags;
1518
1519         cdev = get_gadget_data(gadget);
1520         if (!cdev)
1521                 return;
1522
1523         gi = container_of(cdev, struct gadget_info, cdev);
1524         spin_lock_irqsave(&gi->spinlock, flags);
1525         cdev = get_gadget_data(gadget);
1526         if (!cdev || gi->unbind) {
1527                 spin_unlock_irqrestore(&gi->spinlock, flags);
1528                 return;
1529         }
1530
1531         composite_suspend(gadget);
1532         spin_unlock_irqrestore(&gi->spinlock, flags);
1533 }
1534
1535 static void configfs_composite_resume(struct usb_gadget *gadget)
1536 {
1537         struct usb_composite_dev *cdev;
1538         struct gadget_info *gi;
1539         unsigned long flags;
1540
1541         cdev = get_gadget_data(gadget);
1542         if (!cdev)
1543                 return;
1544
1545         gi = container_of(cdev, struct gadget_info, cdev);
1546         spin_lock_irqsave(&gi->spinlock, flags);
1547         cdev = get_gadget_data(gadget);
1548         if (!cdev || gi->unbind) {
1549                 spin_unlock_irqrestore(&gi->spinlock, flags);
1550                 return;
1551         }
1552
1553         composite_resume(gadget);
1554         spin_unlock_irqrestore(&gi->spinlock, flags);
1555 }
1556
1557 static const struct usb_gadget_driver configfs_driver_template = {
1558         .bind           = configfs_composite_bind,
1559         .unbind         = configfs_composite_unbind,
1560
1561         .setup          = configfs_composite_setup,
1562         .reset          = configfs_composite_reset,
1563         .disconnect     = configfs_composite_disconnect,
1564
1565         .suspend        = configfs_composite_suspend,
1566         .resume         = configfs_composite_resume,
1567
1568         .max_speed      = USB_SPEED_SUPER_PLUS,
1569         .driver = {
1570                 .owner          = THIS_MODULE,
1571                 .name           = "configfs-gadget",
1572         },
1573         .match_existing_only = 1,
1574 };
1575
1576 static struct config_group *gadgets_make(
1577                 struct config_group *group,
1578                 const char *name)
1579 {
1580         struct gadget_info *gi;
1581
1582         gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1583         if (!gi)
1584                 return ERR_PTR(-ENOMEM);
1585
1586         config_group_init_type_name(&gi->group, name, &gadget_root_type);
1587
1588         config_group_init_type_name(&gi->functions_group, "functions",
1589                         &functions_type);
1590         configfs_add_default_group(&gi->functions_group, &gi->group);
1591
1592         config_group_init_type_name(&gi->configs_group, "configs",
1593                         &config_desc_type);
1594         configfs_add_default_group(&gi->configs_group, &gi->group);
1595
1596         config_group_init_type_name(&gi->strings_group, "strings",
1597                         &gadget_strings_strings_type);
1598         configfs_add_default_group(&gi->strings_group, &gi->group);
1599
1600         config_group_init_type_name(&gi->os_desc_group, "os_desc",
1601                         &os_desc_type);
1602         configfs_add_default_group(&gi->os_desc_group, &gi->group);
1603
1604         gi->composite.bind = configfs_do_nothing;
1605         gi->composite.unbind = configfs_do_nothing;
1606         gi->composite.suspend = NULL;
1607         gi->composite.resume = NULL;
1608         gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
1609
1610         spin_lock_init(&gi->spinlock);
1611         mutex_init(&gi->lock);
1612         INIT_LIST_HEAD(&gi->string_list);
1613         INIT_LIST_HEAD(&gi->available_func);
1614
1615         composite_init_dev(&gi->cdev);
1616         gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1617         gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1618         gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1619
1620         gi->composite.gadget_driver = configfs_driver_template;
1621
1622         gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1623         gi->composite.name = gi->composite.gadget_driver.function;
1624
1625         if (!gi->composite.gadget_driver.function)
1626                 goto err;
1627
1628         return &gi->group;
1629 err:
1630         kfree(gi);
1631         return ERR_PTR(-ENOMEM);
1632 }
1633
1634 static void gadgets_drop(struct config_group *group, struct config_item *item)
1635 {
1636         config_item_put(item);
1637 }
1638
1639 static struct configfs_group_operations gadgets_ops = {
1640         .make_group     = &gadgets_make,
1641         .drop_item      = &gadgets_drop,
1642 };
1643
1644 static const struct config_item_type gadgets_type = {
1645         .ct_group_ops   = &gadgets_ops,
1646         .ct_owner       = THIS_MODULE,
1647 };
1648
1649 static struct configfs_subsystem gadget_subsys = {
1650         .su_group = {
1651                 .cg_item = {
1652                         .ci_namebuf = "usb_gadget",
1653                         .ci_type = &gadgets_type,
1654                 },
1655         },
1656         .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1657 };
1658
1659 void unregister_gadget_item(struct config_item *item)
1660 {
1661         struct gadget_info *gi = to_gadget_info(item);
1662
1663         mutex_lock(&gi->lock);
1664         unregister_gadget(gi);
1665         mutex_unlock(&gi->lock);
1666 }
1667 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1668
1669 static int __init gadget_cfs_init(void)
1670 {
1671         int ret;
1672
1673         config_group_init(&gadget_subsys.su_group);
1674
1675         ret = configfs_register_subsystem(&gadget_subsys);
1676         return ret;
1677 }
1678 module_init(gadget_cfs_init);
1679
1680 static void __exit gadget_cfs_exit(void)
1681 {
1682         configfs_unregister_subsystem(&gadget_subsys);
1683 }
1684 module_exit(gadget_cfs_exit);