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xfs: XFS_IS_REALTIME_INODE() should be false if no rt device present
[linux/fpc-iii.git] / drivers / usb / gadget / configfs.c
blob163d305e1200bb07a73357d7b5824d97b362b924
1 #include <linux/configfs.h>
2 #include <linux/module.h>
3 #include <linux/slab.h>
4 #include <linux/device.h>
5 #include <linux/nls.h>
6 #include <linux/usb/composite.h>
7 #include <linux/usb/gadget_configfs.h>
8 #include "configfs.h"
9 #include "u_f.h"
10 #include "u_os_desc.h"
11
12 int check_user_usb_string(const char *name,
13 struct usb_gadget_strings *stringtab_dev)
14 {
15 unsigned primary_lang;
16 unsigned sub_lang;
17 u16 num;
18 int ret;
19
20 ret = kstrtou16(name, 0, &num);
21 if (ret)
22 return ret;
23
24 primary_lang = num & 0x3ff;
25 sub_lang = num >> 10;
26
27 /* simple sanity check for valid langid */
28 switch (primary_lang) {
29 case 0:
30 case 0x62 ... 0xfe:
31 case 0x100 ... 0x3ff:
32 return -EINVAL;
33 }
34 if (!sub_lang)
35 return -EINVAL;
36
37 stringtab_dev->language = num;
38 return 0;
39 }
40
41 #define MAX_NAME_LEN 40
42 #define MAX_USB_STRING_LANGS 2
43
44 static const struct usb_descriptor_header *otg_desc[2];
45
46 struct gadget_info {
47 struct config_group group;
48 struct config_group functions_group;
49 struct config_group configs_group;
50 struct config_group strings_group;
51 struct config_group os_desc_group;
52 struct config_group *default_groups[5];
53
54 struct mutex lock;
55 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
56 struct list_head string_list;
57 struct list_head available_func;
58
59 const char *udc_name;
60 struct usb_composite_driver composite;
61 struct usb_composite_dev cdev;
62 bool use_os_desc;
63 char b_vendor_code;
64 char qw_sign[OS_STRING_QW_SIGN_LEN];
65 };
66
67 static inline struct gadget_info *to_gadget_info(struct config_item *item)
68 {
69 return container_of(to_config_group(item), struct gadget_info, group);
70 }
71
72 struct config_usb_cfg {
73 struct config_group group;
74 struct config_group strings_group;
75 struct config_group *default_groups[2];
76 struct list_head string_list;
77 struct usb_configuration c;
78 struct list_head func_list;
79 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
80 };
81
82 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
83 {
84 return container_of(to_config_group(item), struct config_usb_cfg,
85 group);
86 }
87
88 struct gadget_strings {
89 struct usb_gadget_strings stringtab_dev;
90 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
91 char *manufacturer;
92 char *product;
93 char *serialnumber;
94
95 struct config_group group;
96 struct list_head list;
97 };
98
99 struct os_desc {
100 struct config_group group;
101 };
102
103 struct gadget_config_name {
104 struct usb_gadget_strings stringtab_dev;
105 struct usb_string strings;
106 char *configuration;
107
108 struct config_group group;
109 struct list_head list;
110 };
111
112 static int usb_string_copy(const char *s, char **s_copy)
113 {
114 int ret;
115 char *str;
116 char *copy = *s_copy;
117 ret = strlen(s);
118 if (ret > 126)
119 return -EOVERFLOW;
120
121 str = kstrdup(s, GFP_KERNEL);
122 if (!str)
123 return -ENOMEM;
124 if (str[ret - 1] == '\n')
125 str[ret - 1] = '\0';
126 kfree(copy);
127 *s_copy = str;
128 return 0;
129 }
130
131 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
132 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
133 char *page) \
134 { \
135 return sprintf(page, "0x%02x\n", \
136 to_gadget_info(item)->cdev.desc.__name); \
137 }
138
139 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
140 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
141 char *page) \
142 { \
143 return sprintf(page, "0x%04x\n", \
144 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
145 }
146
147
148 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
149 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
150 const char *page, size_t len) \
151 { \
152 u8 val; \
153 int ret; \
154 ret = kstrtou8(page, 0, &val); \
155 if (ret) \
156 return ret; \
157 to_gadget_info(item)->cdev.desc._name = val; \
158 return len; \
159 }
160
161 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
162 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
163 const char *page, size_t len) \
164 { \
165 u16 val; \
166 int ret; \
167 ret = kstrtou16(page, 0, &val); \
168 if (ret) \
169 return ret; \
170 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
171 return len; \
172 }
173
174 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
175 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
176 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
177
178 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
179 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
180 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
181 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
182 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
183 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
184 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
185 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
186
187 static ssize_t is_valid_bcd(u16 bcd_val)
188 {
189 if ((bcd_val & 0xf) > 9)
190 return -EINVAL;
191 if (((bcd_val >> 4) & 0xf) > 9)
192 return -EINVAL;
193 if (((bcd_val >> 8) & 0xf) > 9)
194 return -EINVAL;
195 if (((bcd_val >> 12) & 0xf) > 9)
196 return -EINVAL;
197 return 0;
198 }
199
200 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
201 const char *page, size_t len)
202 {
203 u16 bcdDevice;
204 int ret;
205
206 ret = kstrtou16(page, 0, &bcdDevice);
207 if (ret)
208 return ret;
209 ret = is_valid_bcd(bcdDevice);
210 if (ret)
211 return ret;
212
213 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
214 return len;
215 }
216
217 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
218 const char *page, size_t len)
219 {
220 u16 bcdUSB;
221 int ret;
222
223 ret = kstrtou16(page, 0, &bcdUSB);
224 if (ret)
225 return ret;
226 ret = is_valid_bcd(bcdUSB);
227 if (ret)
228 return ret;
229
230 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
231 return len;
232 }
233
234 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
235 {
236 return sprintf(page, "%s\n", to_gadget_info(item)->udc_name ?: "");
237 }
238
239 static int unregister_gadget(struct gadget_info *gi)
240 {
241 int ret;
242
243 if (!gi->udc_name)
244 return -ENODEV;
245
246 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
247 if (ret)
248 return ret;
249 kfree(gi->udc_name);
250 gi->udc_name = NULL;
251 return 0;
252 }
253
254 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
255 const char *page, size_t len)
256 {
257 struct gadget_info *gi = to_gadget_info(item);
258 char *name;
259 int ret;
260
261 name = kstrdup(page, GFP_KERNEL);
262 if (!name)
263 return -ENOMEM;
264 if (name[len - 1] == '\n')
265 name[len - 1] = '\0';
266
267 mutex_lock(&gi->lock);
268
269 if (!strlen(name)) {
270 ret = unregister_gadget(gi);
271 if (ret)
272 goto err;
273 } else {
274 if (gi->udc_name) {
275 ret = -EBUSY;
276 goto err;
277 }
278 ret = usb_udc_attach_driver(name, &gi->composite.gadget_driver);
279 if (ret)
280 goto err;
281 gi->udc_name = name;
282 }
283 mutex_unlock(&gi->lock);
284 return len;
285 err:
286 kfree(name);
287 mutex_unlock(&gi->lock);
288 return ret;
289 }
290
291 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
292 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
293 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
294 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
295 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
296 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
297 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
298 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
299 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
300
301 static struct configfs_attribute *gadget_root_attrs[] = {
302 &gadget_dev_desc_attr_bDeviceClass,
303 &gadget_dev_desc_attr_bDeviceSubClass,
304 &gadget_dev_desc_attr_bDeviceProtocol,
305 &gadget_dev_desc_attr_bMaxPacketSize0,
306 &gadget_dev_desc_attr_idVendor,
307 &gadget_dev_desc_attr_idProduct,
308 &gadget_dev_desc_attr_bcdDevice,
309 &gadget_dev_desc_attr_bcdUSB,
310 &gadget_dev_desc_attr_UDC,
311 NULL,
312 };
313
314 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
315 {
316 return container_of(to_config_group(item), struct gadget_strings,
317 group);
318 }
319
320 static inline struct gadget_config_name *to_gadget_config_name(
321 struct config_item *item)
322 {
323 return container_of(to_config_group(item), struct gadget_config_name,
324 group);
325 }
326
327 static inline struct usb_function_instance *to_usb_function_instance(
328 struct config_item *item)
329 {
330 return container_of(to_config_group(item),
331 struct usb_function_instance, group);
332 }
333
334 static void gadget_info_attr_release(struct config_item *item)
335 {
336 struct gadget_info *gi = to_gadget_info(item);
337
338 WARN_ON(!list_empty(&gi->cdev.configs));
339 WARN_ON(!list_empty(&gi->string_list));
340 WARN_ON(!list_empty(&gi->available_func));
341 kfree(gi->composite.gadget_driver.function);
342 kfree(gi);
343 }
344
345 static struct configfs_item_operations gadget_root_item_ops = {
346 .release = gadget_info_attr_release,
347 };
348
349 static void gadget_config_attr_release(struct config_item *item)
350 {
351 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
352
353 WARN_ON(!list_empty(&cfg->c.functions));
354 list_del(&cfg->c.list);
355 kfree(cfg->c.label);
356 kfree(cfg);
357 }
358
359 static int config_usb_cfg_link(
360 struct config_item *usb_cfg_ci,
361 struct config_item *usb_func_ci)
362 {
363 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
364 struct usb_composite_dev *cdev = cfg->c.cdev;
365 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
366
367 struct config_group *group = to_config_group(usb_func_ci);
368 struct usb_function_instance *fi = container_of(group,
369 struct usb_function_instance, group);
370 struct usb_function_instance *a_fi;
371 struct usb_function *f;
372 int ret;
373
374 mutex_lock(&gi->lock);
375 /*
376 * Make sure this function is from within our _this_ gadget and not
377 * from another gadget or a random directory.
378 * Also a function instance can only be linked once.
379 */
380 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
381 if (a_fi == fi)
382 break;
383 }
384 if (a_fi != fi) {
385 ret = -EINVAL;
386 goto out;
387 }
388
389 list_for_each_entry(f, &cfg->func_list, list) {
390 if (f->fi == fi) {
391 ret = -EEXIST;
392 goto out;
393 }
394 }
395
396 f = usb_get_function(fi);
397 if (IS_ERR(f)) {
398 ret = PTR_ERR(f);
399 goto out;
400 }
401
402 /* stash the function until we bind it to the gadget */
403 list_add_tail(&f->list, &cfg->func_list);
404 ret = 0;
405 out:
406 mutex_unlock(&gi->lock);
407 return ret;
408 }
409
410 static int config_usb_cfg_unlink(
411 struct config_item *usb_cfg_ci,
412 struct config_item *usb_func_ci)
413 {
414 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
415 struct usb_composite_dev *cdev = cfg->c.cdev;
416 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
417
418 struct config_group *group = to_config_group(usb_func_ci);
419 struct usb_function_instance *fi = container_of(group,
420 struct usb_function_instance, group);
421 struct usb_function *f;
422
423 /*
424 * ideally I would like to forbid to unlink functions while a gadget is
425 * bound to an UDC. Since this isn't possible at the moment, we simply
426 * force an unbind, the function is available here and then we can
427 * remove the function.
428 */
429 mutex_lock(&gi->lock);
430 if (gi->udc_name)
431 unregister_gadget(gi);
432 WARN_ON(gi->udc_name);
433
434 list_for_each_entry(f, &cfg->func_list, list) {
435 if (f->fi == fi) {
436 list_del(&f->list);
437 usb_put_function(f);
438 mutex_unlock(&gi->lock);
439 return 0;
440 }
441 }
442 mutex_unlock(&gi->lock);
443 WARN(1, "Unable to locate function to unbind\n");
444 return 0;
445 }
446
447 static struct configfs_item_operations gadget_config_item_ops = {
448 .release = gadget_config_attr_release,
449 .allow_link = config_usb_cfg_link,
450 .drop_link = config_usb_cfg_unlink,
451 };
452
453
454 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
455 char *page)
456 {
457 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
458 }
459
460 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
461 const char *page, size_t len)
462 {
463 u16 val;
464 int ret;
465 ret = kstrtou16(page, 0, &val);
466 if (ret)
467 return ret;
468 if (DIV_ROUND_UP(val, 8) > 0xff)
469 return -ERANGE;
470 to_config_usb_cfg(item)->c.MaxPower = val;
471 return len;
472 }
473
474 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
475 char *page)
476 {
477 return sprintf(page, "0x%02x\n",
478 to_config_usb_cfg(item)->c.bmAttributes);
479 }
480
481 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
482 const char *page, size_t len)
483 {
484 u8 val;
485 int ret;
486 ret = kstrtou8(page, 0, &val);
487 if (ret)
488 return ret;
489 if (!(val & USB_CONFIG_ATT_ONE))
490 return -EINVAL;
491 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
492 USB_CONFIG_ATT_WAKEUP))
493 return -EINVAL;
494 to_config_usb_cfg(item)->c.bmAttributes = val;
495 return len;
496 }
497
498 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
499 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
500
501 static struct configfs_attribute *gadget_config_attrs[] = {
502 &gadget_config_desc_attr_MaxPower,
503 &gadget_config_desc_attr_bmAttributes,
504 NULL,
505 };
506
507 static struct config_item_type gadget_config_type = {
508 .ct_item_ops = &gadget_config_item_ops,
509 .ct_attrs = gadget_config_attrs,
510 .ct_owner = THIS_MODULE,
511 };
512
513 static struct config_item_type gadget_root_type = {
514 .ct_item_ops = &gadget_root_item_ops,
515 .ct_attrs = gadget_root_attrs,
516 .ct_owner = THIS_MODULE,
517 };
518
519 static void composite_init_dev(struct usb_composite_dev *cdev)
520 {
521 spin_lock_init(&cdev->lock);
522 INIT_LIST_HEAD(&cdev->configs);
523 INIT_LIST_HEAD(&cdev->gstrings);
524 }
525
526 static struct config_group *function_make(
527 struct config_group *group,
528 const char *name)
529 {
530 struct gadget_info *gi;
531 struct usb_function_instance *fi;
532 char buf[MAX_NAME_LEN];
533 char *func_name;
534 char *instance_name;
535 int ret;
536
537 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
538 if (ret >= MAX_NAME_LEN)
539 return ERR_PTR(-ENAMETOOLONG);
540
541 func_name = buf;
542 instance_name = strchr(func_name, '.');
543 if (!instance_name) {
544 pr_err("Unable to locate . in FUNC.INSTANCE\n");
545 return ERR_PTR(-EINVAL);
546 }
547 *instance_name = '\0';
548 instance_name++;
549
550 fi = usb_get_function_instance(func_name);
551 if (IS_ERR(fi))
552 return ERR_CAST(fi);
553
554 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
555 if (ret) {
556 usb_put_function_instance(fi);
557 return ERR_PTR(ret);
558 }
559 if (fi->set_inst_name) {
560 ret = fi->set_inst_name(fi, instance_name);
561 if (ret) {
562 usb_put_function_instance(fi);
563 return ERR_PTR(ret);
564 }
565 }
566
567 gi = container_of(group, struct gadget_info, functions_group);
568
569 mutex_lock(&gi->lock);
570 list_add_tail(&fi->cfs_list, &gi->available_func);
571 mutex_unlock(&gi->lock);
572 return &fi->group;
573 }
574
575 static void function_drop(
576 struct config_group *group,
577 struct config_item *item)
578 {
579 struct usb_function_instance *fi = to_usb_function_instance(item);
580 struct gadget_info *gi;
581
582 gi = container_of(group, struct gadget_info, functions_group);
583
584 mutex_lock(&gi->lock);
585 list_del(&fi->cfs_list);
586 mutex_unlock(&gi->lock);
587 config_item_put(item);
588 }
589
590 static struct configfs_group_operations functions_ops = {
591 .make_group = &function_make,
592 .drop_item = &function_drop,
593 };
594
595 static struct config_item_type functions_type = {
596 .ct_group_ops = &functions_ops,
597 .ct_owner = THIS_MODULE,
598 };
599
600 GS_STRINGS_RW(gadget_config_name, configuration);
601
602 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
603 &gadget_config_name_attr_configuration,
604 NULL,
605 };
606
607 static void gadget_config_name_attr_release(struct config_item *item)
608 {
609 struct gadget_config_name *cn = to_gadget_config_name(item);
610
611 kfree(cn->configuration);
612
613 list_del(&cn->list);
614 kfree(cn);
615 }
616
617 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
618 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
619
620 static struct config_group *config_desc_make(
621 struct config_group *group,
622 const char *name)
623 {
624 struct gadget_info *gi;
625 struct config_usb_cfg *cfg;
626 char buf[MAX_NAME_LEN];
627 char *num_str;
628 u8 num;
629 int ret;
630
631 gi = container_of(group, struct gadget_info, configs_group);
632 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
633 if (ret >= MAX_NAME_LEN)
634 return ERR_PTR(-ENAMETOOLONG);
635
636 num_str = strchr(buf, '.');
637 if (!num_str) {
638 pr_err("Unable to locate . in name.bConfigurationValue\n");
639 return ERR_PTR(-EINVAL);
640 }
641
642 *num_str = '\0';
643 num_str++;
644
645 if (!strlen(buf))
646 return ERR_PTR(-EINVAL);
647
648 ret = kstrtou8(num_str, 0, &num);
649 if (ret)
650 return ERR_PTR(ret);
651
652 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
653 if (!cfg)
654 return ERR_PTR(-ENOMEM);
655 cfg->c.label = kstrdup(buf, GFP_KERNEL);
656 if (!cfg->c.label) {
657 ret = -ENOMEM;
658 goto err;
659 }
660 cfg->c.bConfigurationValue = num;
661 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
662 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
663 INIT_LIST_HEAD(&cfg->string_list);
664 INIT_LIST_HEAD(&cfg->func_list);
665
666 cfg->group.default_groups = cfg->default_groups;
667 cfg->default_groups[0] = &cfg->strings_group;
668
669 config_group_init_type_name(&cfg->group, name,
670 &gadget_config_type);
671 config_group_init_type_name(&cfg->strings_group, "strings",
672 &gadget_config_name_strings_type);
673
674 ret = usb_add_config_only(&gi->cdev, &cfg->c);
675 if (ret)
676 goto err;
677
678 return &cfg->group;
679 err:
680 kfree(cfg->c.label);
681 kfree(cfg);
682 return ERR_PTR(ret);
683 }
684
685 static void config_desc_drop(
686 struct config_group *group,
687 struct config_item *item)
688 {
689 config_item_put(item);
690 }
691
692 static struct configfs_group_operations config_desc_ops = {
693 .make_group = &config_desc_make,
694 .drop_item = &config_desc_drop,
695 };
696
697 static struct config_item_type config_desc_type = {
698 .ct_group_ops = &config_desc_ops,
699 .ct_owner = THIS_MODULE,
700 };
701
702 GS_STRINGS_RW(gadget_strings, manufacturer);
703 GS_STRINGS_RW(gadget_strings, product);
704 GS_STRINGS_RW(gadget_strings, serialnumber);
705
706 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
707 &gadget_strings_attr_manufacturer,
708 &gadget_strings_attr_product,
709 &gadget_strings_attr_serialnumber,
710 NULL,
711 };
712
713 static void gadget_strings_attr_release(struct config_item *item)
714 {
715 struct gadget_strings *gs = to_gadget_strings(item);
716
717 kfree(gs->manufacturer);
718 kfree(gs->product);
719 kfree(gs->serialnumber);
720
721 list_del(&gs->list);
722 kfree(gs);
723 }
724
725 USB_CONFIG_STRING_RW_OPS(gadget_strings);
726 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
727
728 static inline struct os_desc *to_os_desc(struct config_item *item)
729 {
730 return container_of(to_config_group(item), struct os_desc, group);
731 }
732
733 static inline struct gadget_info *os_desc_item_to_gadget_info(
734 struct config_item *item)
735 {
736 return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
737 }
738
739 static ssize_t os_desc_use_show(struct config_item *item, char *page)
740 {
741 return sprintf(page, "%d",
742 os_desc_item_to_gadget_info(item)->use_os_desc);
743 }
744
745 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
746 size_t len)
747 {
748 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
749 int ret;
750 bool use;
751
752 mutex_lock(&gi->lock);
753 ret = strtobool(page, &use);
754 if (!ret) {
755 gi->use_os_desc = use;
756 ret = len;
757 }
758 mutex_unlock(&gi->lock);
759
760 return ret;
761 }
762
763 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
764 {
765 return sprintf(page, "%d",
766 os_desc_item_to_gadget_info(item)->b_vendor_code);
767 }
768
769 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
770 const char *page, size_t len)
771 {
772 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
773 int ret;
774 u8 b_vendor_code;
775
776 mutex_lock(&gi->lock);
777 ret = kstrtou8(page, 0, &b_vendor_code);
778 if (!ret) {
779 gi->b_vendor_code = b_vendor_code;
780 ret = len;
781 }
782 mutex_unlock(&gi->lock);
783
784 return ret;
785 }
786
787 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
788 {
789 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
790
791 memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
792 return OS_STRING_QW_SIGN_LEN;
793 }
794
795 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
796 size_t len)
797 {
798 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
799 int res, l;
800
801 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
802 if (page[l - 1] == '\n')
803 --l;
804
805 mutex_lock(&gi->lock);
806 res = utf8s_to_utf16s(page, l,
807 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
808 OS_STRING_QW_SIGN_LEN);
809 if (res > 0)
810 res = len;
811 mutex_unlock(&gi->lock);
812
813 return res;
814 }
815
816 CONFIGFS_ATTR(os_desc_, use);
817 CONFIGFS_ATTR(os_desc_, b_vendor_code);
818 CONFIGFS_ATTR(os_desc_, qw_sign);
819
820 static struct configfs_attribute *os_desc_attrs[] = {
821 &os_desc_attr_use,
822 &os_desc_attr_b_vendor_code,
823 &os_desc_attr_qw_sign,
824 NULL,
825 };
826
827 static void os_desc_attr_release(struct config_item *item)
828 {
829 struct os_desc *os_desc = to_os_desc(item);
830 kfree(os_desc);
831 }
832
833 static int os_desc_link(struct config_item *os_desc_ci,
834 struct config_item *usb_cfg_ci)
835 {
836 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
837 struct gadget_info, os_desc_group);
838 struct usb_composite_dev *cdev = &gi->cdev;
839 struct config_usb_cfg *c_target =
840 container_of(to_config_group(usb_cfg_ci),
841 struct config_usb_cfg, group);
842 struct usb_configuration *c;
843 int ret;
844
845 mutex_lock(&gi->lock);
846 list_for_each_entry(c, &cdev->configs, list) {
847 if (c == &c_target->c)
848 break;
849 }
850 if (c != &c_target->c) {
851 ret = -EINVAL;
852 goto out;
853 }
854
855 if (cdev->os_desc_config) {
856 ret = -EBUSY;
857 goto out;
858 }
859
860 cdev->os_desc_config = &c_target->c;
861 ret = 0;
862
863 out:
864 mutex_unlock(&gi->lock);
865 return ret;
866 }
867
868 static int os_desc_unlink(struct config_item *os_desc_ci,
869 struct config_item *usb_cfg_ci)
870 {
871 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
872 struct gadget_info, os_desc_group);
873 struct usb_composite_dev *cdev = &gi->cdev;
874
875 mutex_lock(&gi->lock);
876 if (gi->udc_name)
877 unregister_gadget(gi);
878 cdev->os_desc_config = NULL;
879 WARN_ON(gi->udc_name);
880 mutex_unlock(&gi->lock);
881 return 0;
882 }
883
884 static struct configfs_item_operations os_desc_ops = {
885 .release = os_desc_attr_release,
886 .allow_link = os_desc_link,
887 .drop_link = os_desc_unlink,
888 };
889
890 static struct config_item_type os_desc_type = {
891 .ct_item_ops = &os_desc_ops,
892 .ct_attrs = os_desc_attrs,
893 .ct_owner = THIS_MODULE,
894 };
895
896 static inline struct usb_os_desc_ext_prop
897 *to_usb_os_desc_ext_prop(struct config_item *item)
898 {
899 return container_of(item, struct usb_os_desc_ext_prop, item);
900 }
901
902 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
903 {
904 return sprintf(page, "%d", to_usb_os_desc_ext_prop(item)->type);
905 }
906
907 static ssize_t ext_prop_type_store(struct config_item *item,
908 const char *page, size_t len)
909 {
910 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
911 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
912 u8 type;
913 int ret;
914
915 if (desc->opts_mutex)
916 mutex_lock(desc->opts_mutex);
917 ret = kstrtou8(page, 0, &type);
918 if (ret)
919 goto end;
920 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
921 ret = -EINVAL;
922 goto end;
923 }
924
925 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
926 ext_prop->type == USB_EXT_PROP_LE32 ||
927 ext_prop->type == USB_EXT_PROP_BE32) &&
928 (type == USB_EXT_PROP_UNICODE ||
929 type == USB_EXT_PROP_UNICODE_ENV ||
930 type == USB_EXT_PROP_UNICODE_LINK))
931 ext_prop->data_len <<= 1;
932 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
933 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
934 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
935 (type == USB_EXT_PROP_BINARY ||
936 type == USB_EXT_PROP_LE32 ||
937 type == USB_EXT_PROP_BE32))
938 ext_prop->data_len >>= 1;
939 ext_prop->type = type;
940 ret = len;
941
942 end:
943 if (desc->opts_mutex)
944 mutex_unlock(desc->opts_mutex);
945 return ret;
946 }
947
948 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
949 {
950 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
951 int len = ext_prop->data_len;
952
953 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
954 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
955 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
956 len >>= 1;
957 memcpy(page, ext_prop->data, len);
958
959 return len;
960 }
961
962 static ssize_t ext_prop_data_store(struct config_item *item,
963 const char *page, size_t len)
964 {
965 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
966 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
967 char *new_data;
968 size_t ret_len = len;
969
970 if (page[len - 1] == '\n' || page[len - 1] == '\0')
971 --len;
972 new_data = kmemdup(page, len, GFP_KERNEL);
973 if (!new_data)
974 return -ENOMEM;
975
976 if (desc->opts_mutex)
977 mutex_lock(desc->opts_mutex);
978 kfree(ext_prop->data);
979 ext_prop->data = new_data;
980 desc->ext_prop_len -= ext_prop->data_len;
981 ext_prop->data_len = len;
982 desc->ext_prop_len += ext_prop->data_len;
983 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
984 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
985 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
986 desc->ext_prop_len -= ext_prop->data_len;
987 ext_prop->data_len <<= 1;
988 ext_prop->data_len += 2;
989 desc->ext_prop_len += ext_prop->data_len;
990 }
991 if (desc->opts_mutex)
992 mutex_unlock(desc->opts_mutex);
993 return ret_len;
994 }
995
996 CONFIGFS_ATTR(ext_prop_, type);
997 CONFIGFS_ATTR(ext_prop_, data);
998
999 static struct configfs_attribute *ext_prop_attrs[] = {
1000 &ext_prop_attr_type,
1001 &ext_prop_attr_data,
1002 NULL,
1003 };
1004
1005 static void usb_os_desc_ext_prop_release(struct config_item *item)
1006 {
1007 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1008
1009 kfree(ext_prop); /* frees a whole chunk */
1010 }
1011
1012 static struct configfs_item_operations ext_prop_ops = {
1013 .release = usb_os_desc_ext_prop_release,
1014 };
1015
1016 static struct config_item *ext_prop_make(
1017 struct config_group *group,
1018 const char *name)
1019 {
1020 struct usb_os_desc_ext_prop *ext_prop;
1021 struct config_item_type *ext_prop_type;
1022 struct usb_os_desc *desc;
1023 char *vlabuf;
1024
1025 vla_group(data_chunk);
1026 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1027 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1028
1029 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1030 if (!vlabuf)
1031 return ERR_PTR(-ENOMEM);
1032
1033 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1034 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1035
1036 desc = container_of(group, struct usb_os_desc, group);
1037 ext_prop_type->ct_item_ops = &ext_prop_ops;
1038 ext_prop_type->ct_attrs = ext_prop_attrs;
1039 ext_prop_type->ct_owner = desc->owner;
1040
1041 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1042
1043 ext_prop->name = kstrdup(name, GFP_KERNEL);
1044 if (!ext_prop->name) {
1045 kfree(vlabuf);
1046 return ERR_PTR(-ENOMEM);
1047 }
1048 desc->ext_prop_len += 14;
1049 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1050 if (desc->opts_mutex)
1051 mutex_lock(desc->opts_mutex);
1052 desc->ext_prop_len += ext_prop->name_len;
1053 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1054 ++desc->ext_prop_count;
1055 if (desc->opts_mutex)
1056 mutex_unlock(desc->opts_mutex);
1057
1058 return &ext_prop->item;
1059 }
1060
1061 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1062 {
1063 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1064 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1065
1066 if (desc->opts_mutex)
1067 mutex_lock(desc->opts_mutex);
1068 list_del(&ext_prop->entry);
1069 --desc->ext_prop_count;
1070 kfree(ext_prop->name);
1071 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1072 if (desc->opts_mutex)
1073 mutex_unlock(desc->opts_mutex);
1074 config_item_put(item);
1075 }
1076
1077 static struct configfs_group_operations interf_grp_ops = {
1078 .make_item = &ext_prop_make,
1079 .drop_item = &ext_prop_drop,
1080 };
1081
1082 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1083 char *page)
1084 {
1085 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1086 return 8;
1087 }
1088
1089 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1090 const char *page, size_t len)
1091 {
1092 struct usb_os_desc *desc = to_usb_os_desc(item);
1093 int l;
1094
1095 l = min_t(int, 8, len);
1096 if (page[l - 1] == '\n')
1097 --l;
1098 if (desc->opts_mutex)
1099 mutex_lock(desc->opts_mutex);
1100 memcpy(desc->ext_compat_id, page, l);
1101
1102 if (desc->opts_mutex)
1103 mutex_unlock(desc->opts_mutex);
1104
1105 return len;
1106 }
1107
1108 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1109 char *page)
1110 {
1111 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1112 return 8;
1113 }
1114
1115 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1116 const char *page, size_t len)
1117 {
1118 struct usb_os_desc *desc = to_usb_os_desc(item);
1119 int l;
1120
1121 l = min_t(int, 8, len);
1122 if (page[l - 1] == '\n')
1123 --l;
1124 if (desc->opts_mutex)
1125 mutex_lock(desc->opts_mutex);
1126 memcpy(desc->ext_compat_id + 8, page, l);
1127
1128 if (desc->opts_mutex)
1129 mutex_unlock(desc->opts_mutex);
1130
1131 return len;
1132 }
1133
1134 CONFIGFS_ATTR(interf_grp_, compatible_id);
1135 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1136
1137 static struct configfs_attribute *interf_grp_attrs[] = {
1138 &interf_grp_attr_compatible_id,
1139 &interf_grp_attr_sub_compatible_id,
1140 NULL
1141 };
1142
1143 int usb_os_desc_prepare_interf_dir(struct config_group *parent,
1144 int n_interf,
1145 struct usb_os_desc **desc,
1146 char **names,
1147 struct module *owner)
1148 {
1149 struct config_group **f_default_groups, *os_desc_group,
1150 **interface_groups;
1151 struct config_item_type *os_desc_type, *interface_type;
1152
1153 vla_group(data_chunk);
1154 vla_item(data_chunk, struct config_group *, f_default_groups, 2);
1155 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1156 vla_item(data_chunk, struct config_group *, interface_groups,
1157 n_interf + 1);
1158 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1159 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1160
1161 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1162 if (!vlabuf)
1163 return -ENOMEM;
1164
1165 f_default_groups = vla_ptr(vlabuf, data_chunk, f_default_groups);
1166 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1167 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1168 interface_groups = vla_ptr(vlabuf, data_chunk, interface_groups);
1169 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1170
1171 parent->default_groups = f_default_groups;
1172 os_desc_type->ct_owner = owner;
1173 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1174 f_default_groups[0] = os_desc_group;
1175
1176 os_desc_group->default_groups = interface_groups;
1177 interface_type->ct_group_ops = &interf_grp_ops;
1178 interface_type->ct_attrs = interf_grp_attrs;
1179 interface_type->ct_owner = owner;
1180
1181 while (n_interf--) {
1182 struct usb_os_desc *d;
1183
1184 d = desc[n_interf];
1185 d->owner = owner;
1186 config_group_init_type_name(&d->group, "", interface_type);
1187 config_item_set_name(&d->group.cg_item, "interface.%s",
1188 names[n_interf]);
1189 interface_groups[n_interf] = &d->group;
1190 }
1191
1192 return 0;
1193 }
1194 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1195
1196 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1197 {
1198 WARN_ON(1);
1199 return -EINVAL;
1200 }
1201
1202 int composite_dev_prepare(struct usb_composite_driver *composite,
1203 struct usb_composite_dev *dev);
1204
1205 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1206 struct usb_ep *ep0);
1207
1208 static void purge_configs_funcs(struct gadget_info *gi)
1209 {
1210 struct usb_configuration *c;
1211
1212 list_for_each_entry(c, &gi->cdev.configs, list) {
1213 struct usb_function *f, *tmp;
1214 struct config_usb_cfg *cfg;
1215
1216 cfg = container_of(c, struct config_usb_cfg, c);
1217
1218 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1219
1220 list_move_tail(&f->list, &cfg->func_list);
1221 if (f->unbind) {
1222 dev_err(&gi->cdev.gadget->dev, "unbind function"
1223 " '%s'/%p\n", f->name, f);
1224 f->unbind(c, f);
1225 }
1226 }
1227 c->next_interface_id = 0;
1228 memset(c->interface, 0, sizeof(c->interface));
1229 c->superspeed = 0;
1230 c->highspeed = 0;
1231 c->fullspeed = 0;
1232 }
1233 }
1234
1235 static int configfs_composite_bind(struct usb_gadget *gadget,
1236 struct usb_gadget_driver *gdriver)
1237 {
1238 struct usb_composite_driver *composite = to_cdriver(gdriver);
1239 struct gadget_info *gi = container_of(composite,
1240 struct gadget_info, composite);
1241 struct usb_composite_dev *cdev = &gi->cdev;
1242 struct usb_configuration *c;
1243 struct usb_string *s;
1244 unsigned i;
1245 int ret;
1246
1247 /* the gi->lock is hold by the caller */
1248 cdev->gadget = gadget;
1249 set_gadget_data(gadget, cdev);
1250 ret = composite_dev_prepare(composite, cdev);
1251 if (ret)
1252 return ret;
1253 /* and now the gadget bind */
1254 ret = -EINVAL;
1255
1256 if (list_empty(&gi->cdev.configs)) {
1257 pr_err("Need at least one configuration in %s.\n",
1258 gi->composite.name);
1259 goto err_comp_cleanup;
1260 }
1261
1262
1263 list_for_each_entry(c, &gi->cdev.configs, list) {
1264 struct config_usb_cfg *cfg;
1265
1266 cfg = container_of(c, struct config_usb_cfg, c);
1267 if (list_empty(&cfg->func_list)) {
1268 pr_err("Config %s/%d of %s needs at least one function.\n",
1269 c->label, c->bConfigurationValue,
1270 gi->composite.name);
1271 goto err_comp_cleanup;
1272 }
1273 }
1274
1275 /* init all strings */
1276 if (!list_empty(&gi->string_list)) {
1277 struct gadget_strings *gs;
1278
1279 i = 0;
1280 list_for_each_entry(gs, &gi->string_list, list) {
1281
1282 gi->gstrings[i] = &gs->stringtab_dev;
1283 gs->stringtab_dev.strings = gs->strings;
1284 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1285 gs->manufacturer;
1286 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1287 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1288 i++;
1289 }
1290 gi->gstrings[i] = NULL;
1291 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1292 USB_GADGET_FIRST_AVAIL_IDX);
1293 if (IS_ERR(s)) {
1294 ret = PTR_ERR(s);
1295 goto err_comp_cleanup;
1296 }
1297
1298 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1299 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1300 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1301 }
1302
1303 if (gi->use_os_desc) {
1304 cdev->use_os_string = true;
1305 cdev->b_vendor_code = gi->b_vendor_code;
1306 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1307 }
1308
1309 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1310 struct usb_descriptor_header *usb_desc;
1311
1312 usb_desc = usb_otg_descriptor_alloc(gadget);
1313 if (!usb_desc) {
1314 ret = -ENOMEM;
1315 goto err_comp_cleanup;
1316 }
1317 usb_otg_descriptor_init(gadget, usb_desc);
1318 otg_desc[0] = usb_desc;
1319 otg_desc[1] = NULL;
1320 }
1321
1322 /* Go through all configs, attach all functions */
1323 list_for_each_entry(c, &gi->cdev.configs, list) {
1324 struct config_usb_cfg *cfg;
1325 struct usb_function *f;
1326 struct usb_function *tmp;
1327 struct gadget_config_name *cn;
1328
1329 if (gadget_is_otg(gadget))
1330 c->descriptors = otg_desc;
1331
1332 cfg = container_of(c, struct config_usb_cfg, c);
1333 if (!list_empty(&cfg->string_list)) {
1334 i = 0;
1335 list_for_each_entry(cn, &cfg->string_list, list) {
1336 cfg->gstrings[i] = &cn->stringtab_dev;
1337 cn->stringtab_dev.strings = &cn->strings;
1338 cn->strings.s = cn->configuration;
1339 i++;
1340 }
1341 cfg->gstrings[i] = NULL;
1342 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1343 if (IS_ERR(s)) {
1344 ret = PTR_ERR(s);
1345 goto err_comp_cleanup;
1346 }
1347 c->iConfiguration = s[0].id;
1348 }
1349
1350 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1351 list_del(&f->list);
1352 ret = usb_add_function(c, f);
1353 if (ret) {
1354 list_add(&f->list, &cfg->func_list);
1355 goto err_purge_funcs;
1356 }
1357 }
1358 usb_ep_autoconfig_reset(cdev->gadget);
1359 }
1360 if (cdev->use_os_string) {
1361 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1362 if (ret)
1363 goto err_purge_funcs;
1364 }
1365
1366 usb_ep_autoconfig_reset(cdev->gadget);
1367 return 0;
1368
1369 err_purge_funcs:
1370 purge_configs_funcs(gi);
1371 err_comp_cleanup:
1372 composite_dev_cleanup(cdev);
1373 return ret;
1374 }
1375
1376 static void configfs_composite_unbind(struct usb_gadget *gadget)
1377 {
1378 struct usb_composite_dev *cdev;
1379 struct gadget_info *gi;
1380
1381 /* the gi->lock is hold by the caller */
1382
1383 cdev = get_gadget_data(gadget);
1384 gi = container_of(cdev, struct gadget_info, cdev);
1385
1386 kfree(otg_desc[0]);
1387 otg_desc[0] = NULL;
1388 purge_configs_funcs(gi);
1389 composite_dev_cleanup(cdev);
1390 usb_ep_autoconfig_reset(cdev->gadget);
1391 cdev->gadget = NULL;
1392 set_gadget_data(gadget, NULL);
1393 }
1394
1395 static const struct usb_gadget_driver configfs_driver_template = {
1396 .bind = configfs_composite_bind,
1397 .unbind = configfs_composite_unbind,
1398
1399 .setup = composite_setup,
1400 .reset = composite_disconnect,
1401 .disconnect = composite_disconnect,
1402
1403 .suspend = composite_suspend,
1404 .resume = composite_resume,
1405
1406 .max_speed = USB_SPEED_SUPER,
1407 .driver = {
1408 .owner = THIS_MODULE,
1409 .name = "configfs-gadget",
1410 },
1411 };
1412
1413 static struct config_group *gadgets_make(
1414 struct config_group *group,
1415 const char *name)
1416 {
1417 struct gadget_info *gi;
1418
1419 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1420 if (!gi)
1421 return ERR_PTR(-ENOMEM);
1422
1423 gi->group.default_groups = gi->default_groups;
1424 gi->group.default_groups[0] = &gi->functions_group;
1425 gi->group.default_groups[1] = &gi->configs_group;
1426 gi->group.default_groups[2] = &gi->strings_group;
1427 gi->group.default_groups[3] = &gi->os_desc_group;
1428
1429 config_group_init_type_name(&gi->functions_group, "functions",
1430 &functions_type);
1431 config_group_init_type_name(&gi->configs_group, "configs",
1432 &config_desc_type);
1433 config_group_init_type_name(&gi->strings_group, "strings",
1434 &gadget_strings_strings_type);
1435 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1436 &os_desc_type);
1437
1438 gi->composite.bind = configfs_do_nothing;
1439 gi->composite.unbind = configfs_do_nothing;
1440 gi->composite.suspend = NULL;
1441 gi->composite.resume = NULL;
1442 gi->composite.max_speed = USB_SPEED_SUPER;
1443
1444 mutex_init(&gi->lock);
1445 INIT_LIST_HEAD(&gi->string_list);
1446 INIT_LIST_HEAD(&gi->available_func);
1447
1448 composite_init_dev(&gi->cdev);
1449 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1450 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1451 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1452
1453 gi->composite.gadget_driver = configfs_driver_template;
1454
1455 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1456 gi->composite.name = gi->composite.gadget_driver.function;
1457
1458 if (!gi->composite.gadget_driver.function)
1459 goto err;
1460
1461 config_group_init_type_name(&gi->group, name,
1462 &gadget_root_type);
1463 return &gi->group;
1464 err:
1465 kfree(gi);
1466 return ERR_PTR(-ENOMEM);
1467 }
1468
1469 static void gadgets_drop(struct config_group *group, struct config_item *item)
1470 {
1471 config_item_put(item);
1472 }
1473
1474 static struct configfs_group_operations gadgets_ops = {
1475 .make_group = &gadgets_make,
1476 .drop_item = &gadgets_drop,
1477 };
1478
1479 static struct config_item_type gadgets_type = {
1480 .ct_group_ops = &gadgets_ops,
1481 .ct_owner = THIS_MODULE,
1482 };
1483
1484 static struct configfs_subsystem gadget_subsys = {
1485 .su_group = {
1486 .cg_item = {
1487 .ci_namebuf = "usb_gadget",
1488 .ci_type = &gadgets_type,
1489 },
1490 },
1491 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1492 };
1493
1494 void unregister_gadget_item(struct config_item *item)
1495 {
1496 struct gadget_info *gi = to_gadget_info(item);
1497
1498 unregister_gadget(gi);
1499 }
1500 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1501
1502 static int __init gadget_cfs_init(void)
1503 {
1504 int ret;
1505
1506 config_group_init(&gadget_subsys.su_group);
1507
1508 ret = configfs_register_subsystem(&gadget_subsys);
1509 return ret;
1510 }
1511 module_init(gadget_cfs_init);
1512
1513 static void __exit gadget_cfs_exit(void)
1514 {
1515 configfs_unregister_subsystem(&gadget_subsys);
1516 }
1517 module_exit(gadget_cfs_exit);
Linux with added FPC-III support