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
12int 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
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
44static const struct usb_descriptor_header *otg_desc[2];
45
46struct gadget_info {
47 struct config_group group;
48 struct config_group functions_group;
49 struct config_group configs_group;
50 struct config_group strings_group;
51 struct config_group os_desc_group;
52
53 struct mutex lock;
54 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
55 struct list_head string_list;
56 struct list_head available_func;
57
58 struct usb_composite_driver composite;
59 struct usb_composite_dev cdev;
60 bool use_os_desc;
61 char b_vendor_code;
62 char qw_sign[OS_STRING_QW_SIGN_LEN];
63};
64
65static inline struct gadget_info *to_gadget_info(struct config_item *item)
66{
67 return container_of(to_config_group(item), struct gadget_info, group);
68}
69
70struct config_usb_cfg {
71 struct config_group group;
72 struct config_group strings_group;
73 struct list_head string_list;
74 struct usb_configuration c;
75 struct list_head func_list;
76 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
77};
78
79static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
80{
81 return container_of(to_config_group(item), struct config_usb_cfg,
82 group);
83}
84
85struct gadget_strings {
86 struct usb_gadget_strings stringtab_dev;
87 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
88 char *manufacturer;
89 char *product;
90 char *serialnumber;
91
92 struct config_group group;
93 struct list_head list;
94};
95
96struct os_desc {
97 struct config_group group;
98};
99
100struct gadget_config_name {
101 struct usb_gadget_strings stringtab_dev;
102 struct usb_string strings;
103 char *configuration;
104
105 struct config_group group;
106 struct list_head list;
107};
108
109static int usb_string_copy(const char *s, char **s_copy)
110{
111 int ret;
112 char *str;
113 char *copy = *s_copy;
114 ret = strlen(s);
115 if (ret > 126)
116 return -EOVERFLOW;
117
118 str = kstrdup(s, GFP_KERNEL);
119 if (!str)
120 return -ENOMEM;
121 if (str[ret - 1] == '\n')
122 str[ret - 1] = '\0';
123 kfree(copy);
124 *s_copy = str;
125 return 0;
126}
127
128#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
129static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
130 char *page) \
131{ \
132 return sprintf(page, "0x%02x\n", \
133 to_gadget_info(item)->cdev.desc.__name); \
134}
135
136#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
137static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
138 char *page) \
139{ \
140 return sprintf(page, "0x%04x\n", \
141 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
142}
143
144
145#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
146static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
147 const char *page, size_t len) \
148{ \
149 u8 val; \
150 int ret; \
151 ret = kstrtou8(page, 0, &val); \
152 if (ret) \
153 return ret; \
154 to_gadget_info(item)->cdev.desc._name = val; \
155 return len; \
156}
157
158#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
159static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
160 const char *page, size_t len) \
161{ \
162 u16 val; \
163 int ret; \
164 ret = kstrtou16(page, 0, &val); \
165 if (ret) \
166 return ret; \
167 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
168 return len; \
169}
170
171#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
172 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
173 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
174
175GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
176GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
177GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
178GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
179GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
180GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
181GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
182GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
183
184static ssize_t is_valid_bcd(u16 bcd_val)
185{
186 if ((bcd_val & 0xf) > 9)
187 return -EINVAL;
188 if (((bcd_val >> 4) & 0xf) > 9)
189 return -EINVAL;
190 if (((bcd_val >> 8) & 0xf) > 9)
191 return -EINVAL;
192 if (((bcd_val >> 12) & 0xf) > 9)
193 return -EINVAL;
194 return 0;
195}
196
197static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
198 const char *page, size_t len)
199{
200 u16 bcdDevice;
201 int ret;
202
203 ret = kstrtou16(page, 0, &bcdDevice);
204 if (ret)
205 return ret;
206 ret = is_valid_bcd(bcdDevice);
207 if (ret)
208 return ret;
209
210 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
211 return len;
212}
213
214static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
215 const char *page, size_t len)
216{
217 u16 bcdUSB;
218 int ret;
219
220 ret = kstrtou16(page, 0, &bcdUSB);
221 if (ret)
222 return ret;
223 ret = is_valid_bcd(bcdUSB);
224 if (ret)
225 return ret;
226
227 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
228 return len;
229}
230
231static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
232{
233 char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name;
234
235 return sprintf(page, "%s\n", udc_name ?: "");
236}
237
238static int unregister_gadget(struct gadget_info *gi)
239{
240 int ret;
241
242 if (!gi->composite.gadget_driver.udc_name)
243 return -ENODEV;
244
245 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
246 if (ret)
247 return ret;
248 kfree(gi->composite.gadget_driver.udc_name);
249 gi->composite.gadget_driver.udc_name = NULL;
250 return 0;
251}
252
253static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
254 const char *page, size_t len)
255{
256 struct gadget_info *gi = to_gadget_info(item);
257 char *name;
258 int ret;
259
260 name = kstrdup(page, GFP_KERNEL);
261 if (!name)
262 return -ENOMEM;
263 if (name[len - 1] == '\n')
264 name[len - 1] = '\0';
265
266 mutex_lock(&gi->lock);
267
268 if (!strlen(name)) {
269 ret = unregister_gadget(gi);
270 if (ret)
271 goto err;
272 kfree(name);
273 } else {
274 if (gi->composite.gadget_driver.udc_name) {
275 ret = -EBUSY;
276 goto err;
277 }
278 gi->composite.gadget_driver.udc_name = name;
279 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
280 if (ret) {
281 gi->composite.gadget_driver.udc_name = NULL;
282 goto err;
283 }
284 }
285 mutex_unlock(&gi->lock);
286 return len;
287err:
288 kfree(name);
289 mutex_unlock(&gi->lock);
290 return ret;
291}
292
293CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
294CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
295CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
296CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
297CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
298CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
299CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
300CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
301CONFIGFS_ATTR(gadget_dev_desc_, UDC);
302
303static struct configfs_attribute *gadget_root_attrs[] = {
304 &gadget_dev_desc_attr_bDeviceClass,
305 &gadget_dev_desc_attr_bDeviceSubClass,
306 &gadget_dev_desc_attr_bDeviceProtocol,
307 &gadget_dev_desc_attr_bMaxPacketSize0,
308 &gadget_dev_desc_attr_idVendor,
309 &gadget_dev_desc_attr_idProduct,
310 &gadget_dev_desc_attr_bcdDevice,
311 &gadget_dev_desc_attr_bcdUSB,
312 &gadget_dev_desc_attr_UDC,
313 NULL,
314};
315
316static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
317{
318 return container_of(to_config_group(item), struct gadget_strings,
319 group);
320}
321
322static inline struct gadget_config_name *to_gadget_config_name(
323 struct config_item *item)
324{
325 return container_of(to_config_group(item), struct gadget_config_name,
326 group);
327}
328
329static inline struct usb_function_instance *to_usb_function_instance(
330 struct config_item *item)
331{
332 return container_of(to_config_group(item),
333 struct usb_function_instance, group);
334}
335
336static void gadget_info_attr_release(struct config_item *item)
337{
338 struct gadget_info *gi = to_gadget_info(item);
339
340 WARN_ON(!list_empty(&gi->cdev.configs));
341 WARN_ON(!list_empty(&gi->string_list));
342 WARN_ON(!list_empty(&gi->available_func));
343 kfree(gi->composite.gadget_driver.function);
344 kfree(gi);
345}
346
347static struct configfs_item_operations gadget_root_item_ops = {
348 .release = gadget_info_attr_release,
349};
350
351static void gadget_config_attr_release(struct config_item *item)
352{
353 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
354
355 WARN_ON(!list_empty(&cfg->c.functions));
356 list_del(&cfg->c.list);
357 kfree(cfg->c.label);
358 kfree(cfg);
359}
360
361static int config_usb_cfg_link(
362 struct config_item *usb_cfg_ci,
363 struct config_item *usb_func_ci)
364{
365 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
366 struct usb_composite_dev *cdev = cfg->c.cdev;
367 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
368
369 struct config_group *group = to_config_group(usb_func_ci);
370 struct usb_function_instance *fi = container_of(group,
371 struct usb_function_instance, group);
372 struct usb_function_instance *a_fi;
373 struct usb_function *f;
374 int ret;
375
376 mutex_lock(&gi->lock);
377
378
379
380
381
382 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
383 if (a_fi == fi)
384 break;
385 }
386 if (a_fi != fi) {
387 ret = -EINVAL;
388 goto out;
389 }
390
391 list_for_each_entry(f, &cfg->func_list, list) {
392 if (f->fi == fi) {
393 ret = -EEXIST;
394 goto out;
395 }
396 }
397
398 f = usb_get_function(fi);
399 if (IS_ERR(f)) {
400 ret = PTR_ERR(f);
401 goto out;
402 }
403
404
405 list_add_tail(&f->list, &cfg->func_list);
406 ret = 0;
407out:
408 mutex_unlock(&gi->lock);
409 return ret;
410}
411
412static void config_usb_cfg_unlink(
413 struct config_item *usb_cfg_ci,
414 struct config_item *usb_func_ci)
415{
416 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
417 struct usb_composite_dev *cdev = cfg->c.cdev;
418 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
419
420 struct config_group *group = to_config_group(usb_func_ci);
421 struct usb_function_instance *fi = container_of(group,
422 struct usb_function_instance, group);
423 struct usb_function *f;
424
425
426
427
428
429
430
431 mutex_lock(&gi->lock);
432 if (gi->composite.gadget_driver.udc_name)
433 unregister_gadget(gi);
434 WARN_ON(gi->composite.gadget_driver.udc_name);
435
436 list_for_each_entry(f, &cfg->func_list, list) {
437 if (f->fi == fi) {
438 list_del(&f->list);
439 usb_put_function(f);
440 mutex_unlock(&gi->lock);
441 return;
442 }
443 }
444 mutex_unlock(&gi->lock);
445 WARN(1, "Unable to locate function to unbind\n");
446}
447
448static struct configfs_item_operations gadget_config_item_ops = {
449 .release = gadget_config_attr_release,
450 .allow_link = config_usb_cfg_link,
451 .drop_link = config_usb_cfg_unlink,
452};
453
454
455static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
456 char *page)
457{
458 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
459}
460
461static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
462 const char *page, size_t len)
463{
464 u16 val;
465 int ret;
466 ret = kstrtou16(page, 0, &val);
467 if (ret)
468 return ret;
469 if (DIV_ROUND_UP(val, 8) > 0xff)
470 return -ERANGE;
471 to_config_usb_cfg(item)->c.MaxPower = val;
472 return len;
473}
474
475static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
476 char *page)
477{
478 return sprintf(page, "0x%02x\n",
479 to_config_usb_cfg(item)->c.bmAttributes);
480}
481
482static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
483 const char *page, size_t len)
484{
485 u8 val;
486 int ret;
487 ret = kstrtou8(page, 0, &val);
488 if (ret)
489 return ret;
490 if (!(val & USB_CONFIG_ATT_ONE))
491 return -EINVAL;
492 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
493 USB_CONFIG_ATT_WAKEUP))
494 return -EINVAL;
495 to_config_usb_cfg(item)->c.bmAttributes = val;
496 return len;
497}
498
499CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
500CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
501
502static struct configfs_attribute *gadget_config_attrs[] = {
503 &gadget_config_desc_attr_MaxPower,
504 &gadget_config_desc_attr_bmAttributes,
505 NULL,
506};
507
508static struct config_item_type gadget_config_type = {
509 .ct_item_ops = &gadget_config_item_ops,
510 .ct_attrs = gadget_config_attrs,
511 .ct_owner = THIS_MODULE,
512};
513
514static struct config_item_type gadget_root_type = {
515 .ct_item_ops = &gadget_root_item_ops,
516 .ct_attrs = gadget_root_attrs,
517 .ct_owner = THIS_MODULE,
518};
519
520static void composite_init_dev(struct usb_composite_dev *cdev)
521{
522 spin_lock_init(&cdev->lock);
523 INIT_LIST_HEAD(&cdev->configs);
524 INIT_LIST_HEAD(&cdev->gstrings);
525}
526
527static struct config_group *function_make(
528 struct config_group *group,
529 const char *name)
530{
531 struct gadget_info *gi;
532 struct usb_function_instance *fi;
533 char buf[MAX_NAME_LEN];
534 char *func_name;
535 char *instance_name;
536 int ret;
537
538 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
539 if (ret >= MAX_NAME_LEN)
540 return ERR_PTR(-ENAMETOOLONG);
541
542 func_name = buf;
543 instance_name = strchr(func_name, '.');
544 if (!instance_name) {
545 pr_err("Unable to locate . in FUNC.INSTANCE\n");
546 return ERR_PTR(-EINVAL);
547 }
548 *instance_name = '\0';
549 instance_name++;
550
551 fi = usb_get_function_instance(func_name);
552 if (IS_ERR(fi))
553 return ERR_CAST(fi);
554
555 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
556 if (ret) {
557 usb_put_function_instance(fi);
558 return ERR_PTR(ret);
559 }
560 if (fi->set_inst_name) {
561 ret = fi->set_inst_name(fi, instance_name);
562 if (ret) {
563 usb_put_function_instance(fi);
564 return ERR_PTR(ret);
565 }
566 }
567
568 gi = container_of(group, struct gadget_info, functions_group);
569
570 mutex_lock(&gi->lock);
571 list_add_tail(&fi->cfs_list, &gi->available_func);
572 mutex_unlock(&gi->lock);
573 return &fi->group;
574}
575
576static void function_drop(
577 struct config_group *group,
578 struct config_item *item)
579{
580 struct usb_function_instance *fi = to_usb_function_instance(item);
581 struct gadget_info *gi;
582
583 gi = container_of(group, struct gadget_info, functions_group);
584
585 mutex_lock(&gi->lock);
586 list_del(&fi->cfs_list);
587 mutex_unlock(&gi->lock);
588 config_item_put(item);
589}
590
591static struct configfs_group_operations functions_ops = {
592 .make_group = &function_make,
593 .drop_item = &function_drop,
594};
595
596static struct config_item_type functions_type = {
597 .ct_group_ops = &functions_ops,
598 .ct_owner = THIS_MODULE,
599};
600
601GS_STRINGS_RW(gadget_config_name, configuration);
602
603static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
604 &gadget_config_name_attr_configuration,
605 NULL,
606};
607
608static void gadget_config_name_attr_release(struct config_item *item)
609{
610 struct gadget_config_name *cn = to_gadget_config_name(item);
611
612 kfree(cn->configuration);
613
614 list_del(&cn->list);
615 kfree(cn);
616}
617
618USB_CONFIG_STRING_RW_OPS(gadget_config_name);
619USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
620
621static struct config_group *config_desc_make(
622 struct config_group *group,
623 const char *name)
624{
625 struct gadget_info *gi;
626 struct config_usb_cfg *cfg;
627 char buf[MAX_NAME_LEN];
628 char *num_str;
629 u8 num;
630 int ret;
631
632 gi = container_of(group, struct gadget_info, configs_group);
633 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
634 if (ret >= MAX_NAME_LEN)
635 return ERR_PTR(-ENAMETOOLONG);
636
637 num_str = strchr(buf, '.');
638 if (!num_str) {
639 pr_err("Unable to locate . in name.bConfigurationValue\n");
640 return ERR_PTR(-EINVAL);
641 }
642
643 *num_str = '\0';
644 num_str++;
645
646 if (!strlen(buf))
647 return ERR_PTR(-EINVAL);
648
649 ret = kstrtou8(num_str, 0, &num);
650 if (ret)
651 return ERR_PTR(ret);
652
653 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
654 if (!cfg)
655 return ERR_PTR(-ENOMEM);
656 cfg->c.label = kstrdup(buf, GFP_KERNEL);
657 if (!cfg->c.label) {
658 ret = -ENOMEM;
659 goto err;
660 }
661 cfg->c.bConfigurationValue = num;
662 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
663 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
664 INIT_LIST_HEAD(&cfg->string_list);
665 INIT_LIST_HEAD(&cfg->func_list);
666
667 config_group_init_type_name(&cfg->group, name,
668 &gadget_config_type);
669
670 config_group_init_type_name(&cfg->strings_group, "strings",
671 &gadget_config_name_strings_type);
672 configfs_add_default_group(&cfg->strings_group, &cfg->group);
673
674 ret = usb_add_config_only(&gi->cdev, &cfg->c);
675 if (ret)
676 goto err;
677
678 return &cfg->group;
679err:
680 kfree(cfg->c.label);
681 kfree(cfg);
682 return ERR_PTR(ret);
683}
684
685static void config_desc_drop(
686 struct config_group *group,
687 struct config_item *item)
688{
689 config_item_put(item);
690}
691
692static struct configfs_group_operations config_desc_ops = {
693 .make_group = &config_desc_make,
694 .drop_item = &config_desc_drop,
695};
696
697static struct config_item_type config_desc_type = {
698 .ct_group_ops = &config_desc_ops,
699 .ct_owner = THIS_MODULE,
700};
701
702GS_STRINGS_RW(gadget_strings, manufacturer);
703GS_STRINGS_RW(gadget_strings, product);
704GS_STRINGS_RW(gadget_strings, serialnumber);
705
706static 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
713static 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
725USB_CONFIG_STRING_RW_OPS(gadget_strings);
726USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
727
728static 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
733static 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
739static ssize_t os_desc_use_show(struct config_item *item, char *page)
740{
741 return sprintf(page, "%d\n",
742 os_desc_item_to_gadget_info(item)->use_os_desc);
743}
744
745static 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
763static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
764{
765 return sprintf(page, "0x%02x\n",
766 os_desc_item_to_gadget_info(item)->b_vendor_code);
767}
768
769static 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
787static 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 int res;
791
792 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
793 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
794 page[res++] = '\n';
795
796 return res;
797}
798
799static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
800 size_t len)
801{
802 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
803 int res, l;
804
805 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
806 if (page[l - 1] == '\n')
807 --l;
808
809 mutex_lock(&gi->lock);
810 res = utf8s_to_utf16s(page, l,
811 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
812 OS_STRING_QW_SIGN_LEN);
813 if (res > 0)
814 res = len;
815 mutex_unlock(&gi->lock);
816
817 return res;
818}
819
820CONFIGFS_ATTR(os_desc_, use);
821CONFIGFS_ATTR(os_desc_, b_vendor_code);
822CONFIGFS_ATTR(os_desc_, qw_sign);
823
824static struct configfs_attribute *os_desc_attrs[] = {
825 &os_desc_attr_use,
826 &os_desc_attr_b_vendor_code,
827 &os_desc_attr_qw_sign,
828 NULL,
829};
830
831static void os_desc_attr_release(struct config_item *item)
832{
833 struct os_desc *os_desc = to_os_desc(item);
834 kfree(os_desc);
835}
836
837static int os_desc_link(struct config_item *os_desc_ci,
838 struct config_item *usb_cfg_ci)
839{
840 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
841 struct gadget_info, os_desc_group);
842 struct usb_composite_dev *cdev = &gi->cdev;
843 struct config_usb_cfg *c_target =
844 container_of(to_config_group(usb_cfg_ci),
845 struct config_usb_cfg, group);
846 struct usb_configuration *c;
847 int ret;
848
849 mutex_lock(&gi->lock);
850 list_for_each_entry(c, &cdev->configs, list) {
851 if (c == &c_target->c)
852 break;
853 }
854 if (c != &c_target->c) {
855 ret = -EINVAL;
856 goto out;
857 }
858
859 if (cdev->os_desc_config) {
860 ret = -EBUSY;
861 goto out;
862 }
863
864 cdev->os_desc_config = &c_target->c;
865 ret = 0;
866
867out:
868 mutex_unlock(&gi->lock);
869 return ret;
870}
871
872static void os_desc_unlink(struct config_item *os_desc_ci,
873 struct config_item *usb_cfg_ci)
874{
875 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
876 struct gadget_info, os_desc_group);
877 struct usb_composite_dev *cdev = &gi->cdev;
878
879 mutex_lock(&gi->lock);
880 if (gi->composite.gadget_driver.udc_name)
881 unregister_gadget(gi);
882 cdev->os_desc_config = NULL;
883 WARN_ON(gi->composite.gadget_driver.udc_name);
884 mutex_unlock(&gi->lock);
885}
886
887static struct configfs_item_operations os_desc_ops = {
888 .release = os_desc_attr_release,
889 .allow_link = os_desc_link,
890 .drop_link = os_desc_unlink,
891};
892
893static struct config_item_type os_desc_type = {
894 .ct_item_ops = &os_desc_ops,
895 .ct_attrs = os_desc_attrs,
896 .ct_owner = THIS_MODULE,
897};
898
899static inline struct usb_os_desc_ext_prop
900*to_usb_os_desc_ext_prop(struct config_item *item)
901{
902 return container_of(item, struct usb_os_desc_ext_prop, item);
903}
904
905static ssize_t ext_prop_type_show(struct config_item *item, char *page)
906{
907 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
908}
909
910static ssize_t ext_prop_type_store(struct config_item *item,
911 const char *page, size_t len)
912{
913 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
914 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
915 u8 type;
916 int ret;
917
918 if (desc->opts_mutex)
919 mutex_lock(desc->opts_mutex);
920 ret = kstrtou8(page, 0, &type);
921 if (ret)
922 goto end;
923 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
924 ret = -EINVAL;
925 goto end;
926 }
927
928 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
929 ext_prop->type == USB_EXT_PROP_LE32 ||
930 ext_prop->type == USB_EXT_PROP_BE32) &&
931 (type == USB_EXT_PROP_UNICODE ||
932 type == USB_EXT_PROP_UNICODE_ENV ||
933 type == USB_EXT_PROP_UNICODE_LINK))
934 ext_prop->data_len <<= 1;
935 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
936 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
937 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
938 (type == USB_EXT_PROP_BINARY ||
939 type == USB_EXT_PROP_LE32 ||
940 type == USB_EXT_PROP_BE32))
941 ext_prop->data_len >>= 1;
942 ext_prop->type = type;
943 ret = len;
944
945end:
946 if (desc->opts_mutex)
947 mutex_unlock(desc->opts_mutex);
948 return ret;
949}
950
951static ssize_t ext_prop_data_show(struct config_item *item, char *page)
952{
953 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
954 int len = ext_prop->data_len;
955
956 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
957 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
958 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
959 len >>= 1;
960 memcpy(page, ext_prop->data, len);
961
962 return len;
963}
964
965static ssize_t ext_prop_data_store(struct config_item *item,
966 const char *page, size_t len)
967{
968 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
969 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
970 char *new_data;
971 size_t ret_len = len;
972
973 if (page[len - 1] == '\n' || page[len - 1] == '\0')
974 --len;
975 new_data = kmemdup(page, len, GFP_KERNEL);
976 if (!new_data)
977 return -ENOMEM;
978
979 if (desc->opts_mutex)
980 mutex_lock(desc->opts_mutex);
981 kfree(ext_prop->data);
982 ext_prop->data = new_data;
983 desc->ext_prop_len -= ext_prop->data_len;
984 ext_prop->data_len = len;
985 desc->ext_prop_len += ext_prop->data_len;
986 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
987 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
988 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
989 desc->ext_prop_len -= ext_prop->data_len;
990 ext_prop->data_len <<= 1;
991 ext_prop->data_len += 2;
992 desc->ext_prop_len += ext_prop->data_len;
993 }
994 if (desc->opts_mutex)
995 mutex_unlock(desc->opts_mutex);
996 return ret_len;
997}
998
999CONFIGFS_ATTR(ext_prop_, type);
1000CONFIGFS_ATTR(ext_prop_, data);
1001
1002static struct configfs_attribute *ext_prop_attrs[] = {
1003 &ext_prop_attr_type,
1004 &ext_prop_attr_data,
1005 NULL,
1006};
1007
1008static void usb_os_desc_ext_prop_release(struct config_item *item)
1009{
1010 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1011
1012 kfree(ext_prop);
1013}
1014
1015static struct configfs_item_operations ext_prop_ops = {
1016 .release = usb_os_desc_ext_prop_release,
1017};
1018
1019static struct config_item *ext_prop_make(
1020 struct config_group *group,
1021 const char *name)
1022{
1023 struct usb_os_desc_ext_prop *ext_prop;
1024 struct config_item_type *ext_prop_type;
1025 struct usb_os_desc *desc;
1026 char *vlabuf;
1027
1028 vla_group(data_chunk);
1029 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1030 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1031
1032 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1033 if (!vlabuf)
1034 return ERR_PTR(-ENOMEM);
1035
1036 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1037 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1038
1039 desc = container_of(group, struct usb_os_desc, group);
1040 ext_prop_type->ct_item_ops = &ext_prop_ops;
1041 ext_prop_type->ct_attrs = ext_prop_attrs;
1042 ext_prop_type->ct_owner = desc->owner;
1043
1044 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1045
1046 ext_prop->name = kstrdup(name, GFP_KERNEL);
1047 if (!ext_prop->name) {
1048 kfree(vlabuf);
1049 return ERR_PTR(-ENOMEM);
1050 }
1051 desc->ext_prop_len += 14;
1052 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1053 if (desc->opts_mutex)
1054 mutex_lock(desc->opts_mutex);
1055 desc->ext_prop_len += ext_prop->name_len;
1056 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1057 ++desc->ext_prop_count;
1058 if (desc->opts_mutex)
1059 mutex_unlock(desc->opts_mutex);
1060
1061 return &ext_prop->item;
1062}
1063
1064static void ext_prop_drop(struct config_group *group, struct config_item *item)
1065{
1066 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1067 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1068
1069 if (desc->opts_mutex)
1070 mutex_lock(desc->opts_mutex);
1071 list_del(&ext_prop->entry);
1072 --desc->ext_prop_count;
1073 kfree(ext_prop->name);
1074 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1075 if (desc->opts_mutex)
1076 mutex_unlock(desc->opts_mutex);
1077 config_item_put(item);
1078}
1079
1080static struct configfs_group_operations interf_grp_ops = {
1081 .make_item = &ext_prop_make,
1082 .drop_item = &ext_prop_drop,
1083};
1084
1085static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1086 char *page)
1087{
1088 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1089 return 8;
1090}
1091
1092static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1093 const char *page, size_t len)
1094{
1095 struct usb_os_desc *desc = to_usb_os_desc(item);
1096 int l;
1097
1098 l = min_t(int, 8, len);
1099 if (page[l - 1] == '\n')
1100 --l;
1101 if (desc->opts_mutex)
1102 mutex_lock(desc->opts_mutex);
1103 memcpy(desc->ext_compat_id, page, l);
1104
1105 if (desc->opts_mutex)
1106 mutex_unlock(desc->opts_mutex);
1107
1108 return len;
1109}
1110
1111static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1112 char *page)
1113{
1114 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1115 return 8;
1116}
1117
1118static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1119 const char *page, size_t len)
1120{
1121 struct usb_os_desc *desc = to_usb_os_desc(item);
1122 int l;
1123
1124 l = min_t(int, 8, len);
1125 if (page[l - 1] == '\n')
1126 --l;
1127 if (desc->opts_mutex)
1128 mutex_lock(desc->opts_mutex);
1129 memcpy(desc->ext_compat_id + 8, page, l);
1130
1131 if (desc->opts_mutex)
1132 mutex_unlock(desc->opts_mutex);
1133
1134 return len;
1135}
1136
1137CONFIGFS_ATTR(interf_grp_, compatible_id);
1138CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1139
1140static struct configfs_attribute *interf_grp_attrs[] = {
1141 &interf_grp_attr_compatible_id,
1142 &interf_grp_attr_sub_compatible_id,
1143 NULL
1144};
1145
1146int usb_os_desc_prepare_interf_dir(struct config_group *parent,
1147 int n_interf,
1148 struct usb_os_desc **desc,
1149 char **names,
1150 struct module *owner)
1151{
1152 struct config_group *os_desc_group;
1153 struct config_item_type *os_desc_type, *interface_type;
1154
1155 vla_group(data_chunk);
1156 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1157 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1158 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1159
1160 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1161 if (!vlabuf)
1162 return -ENOMEM;
1163
1164 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1165 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1166 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1167
1168 os_desc_type->ct_owner = owner;
1169 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1170 configfs_add_default_group(os_desc_group, parent);
1171
1172 interface_type->ct_group_ops = &interf_grp_ops;
1173 interface_type->ct_attrs = interf_grp_attrs;
1174 interface_type->ct_owner = owner;
1175
1176 while (n_interf--) {
1177 struct usb_os_desc *d;
1178
1179 d = desc[n_interf];
1180 d->owner = owner;
1181 config_group_init_type_name(&d->group, "", interface_type);
1182 config_item_set_name(&d->group.cg_item, "interface.%s",
1183 names[n_interf]);
1184 configfs_add_default_group(&d->group, os_desc_group);
1185 }
1186
1187 return 0;
1188}
1189EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1190
1191static int configfs_do_nothing(struct usb_composite_dev *cdev)
1192{
1193 WARN_ON(1);
1194 return -EINVAL;
1195}
1196
1197int composite_dev_prepare(struct usb_composite_driver *composite,
1198 struct usb_composite_dev *dev);
1199
1200int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1201 struct usb_ep *ep0);
1202
1203static void purge_configs_funcs(struct gadget_info *gi)
1204{
1205 struct usb_configuration *c;
1206
1207 list_for_each_entry(c, &gi->cdev.configs, list) {
1208 struct usb_function *f, *tmp;
1209 struct config_usb_cfg *cfg;
1210
1211 cfg = container_of(c, struct config_usb_cfg, c);
1212
1213 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1214
1215 list_move_tail(&f->list, &cfg->func_list);
1216 if (f->unbind) {
1217 dev_dbg(&gi->cdev.gadget->dev,
1218 "unbind function '%s'/%p\n",
1219 f->name, f);
1220 f->unbind(c, f);
1221 }
1222 }
1223 c->next_interface_id = 0;
1224 memset(c->interface, 0, sizeof(c->interface));
1225 c->superspeed_plus = 0;
1226 c->superspeed = 0;
1227 c->highspeed = 0;
1228 c->fullspeed = 0;
1229 }
1230}
1231
1232static int configfs_composite_bind(struct usb_gadget *gadget,
1233 struct usb_gadget_driver *gdriver)
1234{
1235 struct usb_composite_driver *composite = to_cdriver(gdriver);
1236 struct gadget_info *gi = container_of(composite,
1237 struct gadget_info, composite);
1238 struct usb_composite_dev *cdev = &gi->cdev;
1239 struct usb_configuration *c;
1240 struct usb_string *s;
1241 unsigned i;
1242 int ret;
1243
1244
1245 cdev->gadget = gadget;
1246 set_gadget_data(gadget, cdev);
1247 ret = composite_dev_prepare(composite, cdev);
1248 if (ret)
1249 return ret;
1250
1251 ret = -EINVAL;
1252
1253 if (list_empty(&gi->cdev.configs)) {
1254 pr_err("Need at least one configuration in %s.\n",
1255 gi->composite.name);
1256 goto err_comp_cleanup;
1257 }
1258
1259
1260 list_for_each_entry(c, &gi->cdev.configs, list) {
1261 struct config_usb_cfg *cfg;
1262
1263 cfg = container_of(c, struct config_usb_cfg, c);
1264 if (list_empty(&cfg->func_list)) {
1265 pr_err("Config %s/%d of %s needs at least one function.\n",
1266 c->label, c->bConfigurationValue,
1267 gi->composite.name);
1268 goto err_comp_cleanup;
1269 }
1270 }
1271
1272
1273 if (!list_empty(&gi->string_list)) {
1274 struct gadget_strings *gs;
1275
1276 i = 0;
1277 list_for_each_entry(gs, &gi->string_list, list) {
1278
1279 gi->gstrings[i] = &gs->stringtab_dev;
1280 gs->stringtab_dev.strings = gs->strings;
1281 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1282 gs->manufacturer;
1283 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1284 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1285 i++;
1286 }
1287 gi->gstrings[i] = NULL;
1288 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1289 USB_GADGET_FIRST_AVAIL_IDX);
1290 if (IS_ERR(s)) {
1291 ret = PTR_ERR(s);
1292 goto err_comp_cleanup;
1293 }
1294
1295 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1296 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1297 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1298 }
1299
1300 if (gi->use_os_desc) {
1301 cdev->use_os_string = true;
1302 cdev->b_vendor_code = gi->b_vendor_code;
1303 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1304 }
1305
1306 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1307 struct usb_descriptor_header *usb_desc;
1308
1309 usb_desc = usb_otg_descriptor_alloc(gadget);
1310 if (!usb_desc) {
1311 ret = -ENOMEM;
1312 goto err_comp_cleanup;
1313 }
1314 usb_otg_descriptor_init(gadget, usb_desc);
1315 otg_desc[0] = usb_desc;
1316 otg_desc[1] = NULL;
1317 }
1318
1319
1320 list_for_each_entry(c, &gi->cdev.configs, list) {
1321 struct config_usb_cfg *cfg;
1322 struct usb_function *f;
1323 struct usb_function *tmp;
1324 struct gadget_config_name *cn;
1325
1326 if (gadget_is_otg(gadget))
1327 c->descriptors = otg_desc;
1328
1329 cfg = container_of(c, struct config_usb_cfg, c);
1330 if (!list_empty(&cfg->string_list)) {
1331 i = 0;
1332 list_for_each_entry(cn, &cfg->string_list, list) {
1333 cfg->gstrings[i] = &cn->stringtab_dev;
1334 cn->stringtab_dev.strings = &cn->strings;
1335 cn->strings.s = cn->configuration;
1336 i++;
1337 }
1338 cfg->gstrings[i] = NULL;
1339 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1340 if (IS_ERR(s)) {
1341 ret = PTR_ERR(s);
1342 goto err_comp_cleanup;
1343 }
1344 c->iConfiguration = s[0].id;
1345 }
1346
1347 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1348 list_del(&f->list);
1349 ret = usb_add_function(c, f);
1350 if (ret) {
1351 list_add(&f->list, &cfg->func_list);
1352 goto err_purge_funcs;
1353 }
1354 }
1355 usb_ep_autoconfig_reset(cdev->gadget);
1356 }
1357 if (cdev->use_os_string) {
1358 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1359 if (ret)
1360 goto err_purge_funcs;
1361 }
1362
1363 usb_ep_autoconfig_reset(cdev->gadget);
1364 return 0;
1365
1366err_purge_funcs:
1367 purge_configs_funcs(gi);
1368err_comp_cleanup:
1369 composite_dev_cleanup(cdev);
1370 return ret;
1371}
1372
1373static void configfs_composite_unbind(struct usb_gadget *gadget)
1374{
1375 struct usb_composite_dev *cdev;
1376 struct gadget_info *gi;
1377
1378
1379
1380 cdev = get_gadget_data(gadget);
1381 gi = container_of(cdev, struct gadget_info, cdev);
1382
1383 kfree(otg_desc[0]);
1384 otg_desc[0] = NULL;
1385 purge_configs_funcs(gi);
1386 composite_dev_cleanup(cdev);
1387 usb_ep_autoconfig_reset(cdev->gadget);
1388 cdev->gadget = NULL;
1389 set_gadget_data(gadget, NULL);
1390}
1391
1392static const struct usb_gadget_driver configfs_driver_template = {
1393 .bind = configfs_composite_bind,
1394 .unbind = configfs_composite_unbind,
1395
1396 .setup = composite_setup,
1397 .reset = composite_disconnect,
1398 .disconnect = composite_disconnect,
1399
1400 .suspend = composite_suspend,
1401 .resume = composite_resume,
1402
1403 .max_speed = USB_SPEED_SUPER,
1404 .driver = {
1405 .owner = THIS_MODULE,
1406 .name = "configfs-gadget",
1407 },
1408 .match_existing_only = 1,
1409};
1410
1411static struct config_group *gadgets_make(
1412 struct config_group *group,
1413 const char *name)
1414{
1415 struct gadget_info *gi;
1416
1417 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1418 if (!gi)
1419 return ERR_PTR(-ENOMEM);
1420
1421 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1422
1423 config_group_init_type_name(&gi->functions_group, "functions",
1424 &functions_type);
1425 configfs_add_default_group(&gi->functions_group, &gi->group);
1426
1427 config_group_init_type_name(&gi->configs_group, "configs",
1428 &config_desc_type);
1429 configfs_add_default_group(&gi->configs_group, &gi->group);
1430
1431 config_group_init_type_name(&gi->strings_group, "strings",
1432 &gadget_strings_strings_type);
1433 configfs_add_default_group(&gi->strings_group, &gi->group);
1434
1435 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1436 &os_desc_type);
1437 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1438
1439 gi->composite.bind = configfs_do_nothing;
1440 gi->composite.unbind = configfs_do_nothing;
1441 gi->composite.suspend = NULL;
1442 gi->composite.resume = NULL;
1443 gi->composite.max_speed = USB_SPEED_SUPER;
1444
1445 mutex_init(&gi->lock);
1446 INIT_LIST_HEAD(&gi->string_list);
1447 INIT_LIST_HEAD(&gi->available_func);
1448
1449 composite_init_dev(&gi->cdev);
1450 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1451 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1452 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1453
1454 gi->composite.gadget_driver = configfs_driver_template;
1455
1456 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1457 gi->composite.name = gi->composite.gadget_driver.function;
1458
1459 if (!gi->composite.gadget_driver.function)
1460 goto err;
1461
1462 return &gi->group;
1463err:
1464 kfree(gi);
1465 return ERR_PTR(-ENOMEM);
1466}
1467
1468static void gadgets_drop(struct config_group *group, struct config_item *item)
1469{
1470 config_item_put(item);
1471}
1472
1473static struct configfs_group_operations gadgets_ops = {
1474 .make_group = &gadgets_make,
1475 .drop_item = &gadgets_drop,
1476};
1477
1478static struct config_item_type gadgets_type = {
1479 .ct_group_ops = &gadgets_ops,
1480 .ct_owner = THIS_MODULE,
1481};
1482
1483static struct configfs_subsystem gadget_subsys = {
1484 .su_group = {
1485 .cg_item = {
1486 .ci_namebuf = "usb_gadget",
1487 .ci_type = &gadgets_type,
1488 },
1489 },
1490 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1491};
1492
1493void unregister_gadget_item(struct config_item *item)
1494{
1495 struct gadget_info *gi = to_gadget_info(item);
1496
1497 mutex_lock(&gi->lock);
1498 unregister_gadget(gi);
1499 mutex_unlock(&gi->lock);
1500}
1501EXPORT_SYMBOL_GPL(unregister_gadget_item);
1502
1503static int __init gadget_cfs_init(void)
1504{
1505 int ret;
1506
1507 config_group_init(&gadget_subsys.su_group);
1508
1509 ret = configfs_register_subsystem(&gadget_subsys);
1510 return ret;
1511}
1512module_init(gadget_cfs_init);
1513
1514static void __exit gadget_cfs_exit(void)
1515{
1516 configfs_unregister_subsystem(&gadget_subsys);
1517}
1518module_exit(gadget_cfs_exit);
1519
