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[mirror_ubuntu-bionic-kernel.git] / drivers / usb / gadget / configfs.c
1 #include <linux/configfs.h>
2 #include <linux/module.h>
3 #include <linux/slab.h>
4 #include <linux/device.h>
5 #include <linux/nls.h>
6 #include <linux/usb/composite.h>
7 #include <linux/usb/gadget_configfs.h>
8 #include "configfs.h"
9 #include "u_f.h"
10 #include "u_os_desc.h"
11
12 int check_user_usb_string(const char *name,
13 struct usb_gadget_strings *stringtab_dev)
14 {
15 unsigned primary_lang;
16 unsigned sub_lang;
17 u16 num;
18 int ret;
19
20 ret = kstrtou16(name, 0, &num);
21 if (ret)
22 return ret;
23
24 primary_lang = num & 0x3ff;
25 sub_lang = num >> 10;
26
27 /* simple sanity check for valid langid */
28 switch (primary_lang) {
29 case 0:
30 case 0x62 ... 0xfe:
31 case 0x100 ... 0x3ff:
32 return -EINVAL;
33 }
34 if (!sub_lang)
35 return -EINVAL;
36
37 stringtab_dev->language = num;
38 return 0;
39 }
40
41 #define MAX_NAME_LEN 40
42 #define MAX_USB_STRING_LANGS 2
43
44 static const struct usb_descriptor_header *otg_desc[2];
45
46 struct gadget_info {
47 struct config_group group;
48 struct config_group functions_group;
49 struct config_group configs_group;
50 struct config_group strings_group;
51 struct config_group os_desc_group;
52
53 struct mutex lock;
54 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
55 struct list_head string_list;
56 struct list_head available_func;
57
58 struct usb_composite_driver composite;
59 struct usb_composite_dev cdev;
60 bool use_os_desc;
61 char b_vendor_code;
62 char qw_sign[OS_STRING_QW_SIGN_LEN];
63 };
64
65 static inline struct gadget_info *to_gadget_info(struct config_item *item)
66 {
67 return container_of(to_config_group(item), struct gadget_info, group);
68 }
69
70 struct config_usb_cfg {
71 struct config_group group;
72 struct config_group strings_group;
73 struct list_head string_list;
74 struct usb_configuration c;
75 struct list_head func_list;
76 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
77 };
78
79 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
80 {
81 return container_of(to_config_group(item), struct config_usb_cfg,
82 group);
83 }
84
85 struct gadget_strings {
86 struct usb_gadget_strings stringtab_dev;
87 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
88 char *manufacturer;
89 char *product;
90 char *serialnumber;
91
92 struct config_group group;
93 struct list_head list;
94 };
95
96 struct os_desc {
97 struct config_group group;
98 };
99
100 struct gadget_config_name {
101 struct usb_gadget_strings stringtab_dev;
102 struct usb_string strings;
103 char *configuration;
104
105 struct config_group group;
106 struct list_head list;
107 };
108
109 static int usb_string_copy(const char *s, char **s_copy)
110 {
111 int ret;
112 char *str;
113 char *copy = *s_copy;
114 ret = strlen(s);
115 if (ret > 126)
116 return -EOVERFLOW;
117
118 str = kstrdup(s, GFP_KERNEL);
119 if (!str)
120 return -ENOMEM;
121 if (str[ret - 1] == '\n')
122 str[ret - 1] = '\0';
123 kfree(copy);
124 *s_copy = str;
125 return 0;
126 }
127
128 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
129 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
130 char *page) \
131 { \
132 return sprintf(page, "0x%02x\n", \
133 to_gadget_info(item)->cdev.desc.__name); \
134 }
135
136 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
137 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
138 char *page) \
139 { \
140 return sprintf(page, "0x%04x\n", \
141 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
142 }
143
144
145 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
146 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
147 const char *page, size_t len) \
148 { \
149 u8 val; \
150 int ret; \
151 ret = kstrtou8(page, 0, &val); \
152 if (ret) \
153 return ret; \
154 to_gadget_info(item)->cdev.desc._name = val; \
155 return len; \
156 }
157
158 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
159 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
160 const char *page, size_t len) \
161 { \
162 u16 val; \
163 int ret; \
164 ret = kstrtou16(page, 0, &val); \
165 if (ret) \
166 return ret; \
167 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
168 return len; \
169 }
170
171 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
172 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
173 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
174
175 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
176 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
177 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
178 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
179 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
180 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
181 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
182 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
183
184 static ssize_t is_valid_bcd(u16 bcd_val)
185 {
186 if ((bcd_val & 0xf) > 9)
187 return -EINVAL;
188 if (((bcd_val >> 4) & 0xf) > 9)
189 return -EINVAL;
190 if (((bcd_val >> 8) & 0xf) > 9)
191 return -EINVAL;
192 if (((bcd_val >> 12) & 0xf) > 9)
193 return -EINVAL;
194 return 0;
195 }
196
197 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
198 const char *page, size_t len)
199 {
200 u16 bcdDevice;
201 int ret;
202
203 ret = kstrtou16(page, 0, &bcdDevice);
204 if (ret)
205 return ret;
206 ret = is_valid_bcd(bcdDevice);
207 if (ret)
208 return ret;
209
210 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
211 return len;
212 }
213
214 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
215 const char *page, size_t len)
216 {
217 u16 bcdUSB;
218 int ret;
219
220 ret = kstrtou16(page, 0, &bcdUSB);
221 if (ret)
222 return ret;
223 ret = is_valid_bcd(bcdUSB);
224 if (ret)
225 return ret;
226
227 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
228 return len;
229 }
230
231 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
232 {
233 char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name;
234
235 return sprintf(page, "%s\n", udc_name ?: "");
236 }
237
238 static int unregister_gadget(struct gadget_info *gi)
239 {
240 int ret;
241
242 if (!gi->composite.gadget_driver.udc_name)
243 return -ENODEV;
244
245 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
246 if (ret)
247 return ret;
248 kfree(gi->composite.gadget_driver.udc_name);
249 gi->composite.gadget_driver.udc_name = NULL;
250 return 0;
251 }
252
253 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
254 const char *page, size_t len)
255 {
256 struct gadget_info *gi = to_gadget_info(item);
257 char *name;
258 int ret;
259
260 name = kstrdup(page, GFP_KERNEL);
261 if (!name)
262 return -ENOMEM;
263 if (name[len - 1] == '\n')
264 name[len - 1] = '\0';
265
266 mutex_lock(&gi->lock);
267
268 if (!strlen(name)) {
269 ret = unregister_gadget(gi);
270 if (ret)
271 goto err;
272 kfree(name);
273 } else {
274 if (gi->composite.gadget_driver.udc_name) {
275 ret = -EBUSY;
276 goto err;
277 }
278 gi->composite.gadget_driver.udc_name = name;
279 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
280 if (ret) {
281 gi->composite.gadget_driver.udc_name = NULL;
282 goto err;
283 }
284 }
285 mutex_unlock(&gi->lock);
286 return len;
287 err:
288 kfree(name);
289 mutex_unlock(&gi->lock);
290 return ret;
291 }
292
293 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
294 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
295 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
296 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
297 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
298 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
299 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
300 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
301 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
302
303 static struct configfs_attribute *gadget_root_attrs[] = {
304 &gadget_dev_desc_attr_bDeviceClass,
305 &gadget_dev_desc_attr_bDeviceSubClass,
306 &gadget_dev_desc_attr_bDeviceProtocol,
307 &gadget_dev_desc_attr_bMaxPacketSize0,
308 &gadget_dev_desc_attr_idVendor,
309 &gadget_dev_desc_attr_idProduct,
310 &gadget_dev_desc_attr_bcdDevice,
311 &gadget_dev_desc_attr_bcdUSB,
312 &gadget_dev_desc_attr_UDC,
313 NULL,
314 };
315
316 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
317 {
318 return container_of(to_config_group(item), struct gadget_strings,
319 group);
320 }
321
322 static inline struct gadget_config_name *to_gadget_config_name(
323 struct config_item *item)
324 {
325 return container_of(to_config_group(item), struct gadget_config_name,
326 group);
327 }
328
329 static inline struct usb_function_instance *to_usb_function_instance(
330 struct config_item *item)
331 {
332 return container_of(to_config_group(item),
333 struct usb_function_instance, group);
334 }
335
336 static void gadget_info_attr_release(struct config_item *item)
337 {
338 struct gadget_info *gi = to_gadget_info(item);
339
340 WARN_ON(!list_empty(&gi->cdev.configs));
341 WARN_ON(!list_empty(&gi->string_list));
342 WARN_ON(!list_empty(&gi->available_func));
343 kfree(gi->composite.gadget_driver.function);
344 kfree(gi);
345 }
346
347 static struct configfs_item_operations gadget_root_item_ops = {
348 .release = gadget_info_attr_release,
349 };
350
351 static void gadget_config_attr_release(struct config_item *item)
352 {
353 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
354
355 WARN_ON(!list_empty(&cfg->c.functions));
356 list_del(&cfg->c.list);
357 kfree(cfg->c.label);
358 kfree(cfg);
359 }
360
361 static int config_usb_cfg_link(
362 struct config_item *usb_cfg_ci,
363 struct config_item *usb_func_ci)
364 {
365 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
366 struct usb_composite_dev *cdev = cfg->c.cdev;
367 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
368
369 struct config_group *group = to_config_group(usb_func_ci);
370 struct usb_function_instance *fi = container_of(group,
371 struct usb_function_instance, group);
372 struct usb_function_instance *a_fi;
373 struct usb_function *f;
374 int ret;
375
376 mutex_lock(&gi->lock);
377 /*
378 * Make sure this function is from within our _this_ gadget and not
379 * from another gadget or a random directory.
380 * Also a function instance can only be linked once.
381 */
382 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
383 if (a_fi == fi)
384 break;
385 }
386 if (a_fi != fi) {
387 ret = -EINVAL;
388 goto out;
389 }
390
391 list_for_each_entry(f, &cfg->func_list, list) {
392 if (f->fi == fi) {
393 ret = -EEXIST;
394 goto out;
395 }
396 }
397
398 f = usb_get_function(fi);
399 if (IS_ERR(f)) {
400 ret = PTR_ERR(f);
401 goto out;
402 }
403
404 /* stash the function until we bind it to the gadget */
405 list_add_tail(&f->list, &cfg->func_list);
406 ret = 0;
407 out:
408 mutex_unlock(&gi->lock);
409 return ret;
410 }
411
412 static 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 * ideally I would like to forbid to unlink functions while a gadget is
427 * bound to an UDC. Since this isn't possible at the moment, we simply
428 * force an unbind, the function is available here and then we can
429 * remove the function.
430 */
431 mutex_lock(&gi->lock);
432 if (gi->composite.gadget_driver.udc_name)
433 unregister_gadget(gi);
434 WARN_ON(gi->composite.gadget_driver.udc_name);
435
436 list_for_each_entry(f, &cfg->func_list, list) {
437 if (f->fi == fi) {
438 list_del(&f->list);
439 usb_put_function(f);
440 mutex_unlock(&gi->lock);
441 return;
442 }
443 }
444 mutex_unlock(&gi->lock);
445 WARN(1, "Unable to locate function to unbind\n");
446 }
447
448 static 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
455 static 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
461 static 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
475 static 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
482 static 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
499 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
500 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
501
502 static struct configfs_attribute *gadget_config_attrs[] = {
503 &gadget_config_desc_attr_MaxPower,
504 &gadget_config_desc_attr_bmAttributes,
505 NULL,
506 };
507
508 static 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
514 static 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
520 static 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
527 static 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
576 static 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
591 static struct configfs_group_operations functions_ops = {
592 .make_group = &function_make,
593 .drop_item = &function_drop,
594 };
595
596 static struct config_item_type functions_type = {
597 .ct_group_ops = &functions_ops,
598 .ct_owner = THIS_MODULE,
599 };
600
601 GS_STRINGS_RW(gadget_config_name, configuration);
602
603 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
604 &gadget_config_name_attr_configuration,
605 NULL,
606 };
607
608 static 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
618 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
619 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
620
621 static 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;
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 void 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->composite.gadget_driver.udc_name)
877 unregister_gadget(gi);
878 cdev->os_desc_config = NULL;
879 WARN_ON(gi->composite.gadget_driver.udc_name);
880 mutex_unlock(&gi->lock);
881 }
882
883 static struct configfs_item_operations os_desc_ops = {
884 .release = os_desc_attr_release,
885 .allow_link = os_desc_link,
886 .drop_link = os_desc_unlink,
887 };
888
889 static struct config_item_type os_desc_type = {
890 .ct_item_ops = &os_desc_ops,
891 .ct_attrs = os_desc_attrs,
892 .ct_owner = THIS_MODULE,
893 };
894
895 static inline struct usb_os_desc_ext_prop
896 *to_usb_os_desc_ext_prop(struct config_item *item)
897 {
898 return container_of(item, struct usb_os_desc_ext_prop, item);
899 }
900
901 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
902 {
903 return sprintf(page, "%d", to_usb_os_desc_ext_prop(item)->type);
904 }
905
906 static ssize_t ext_prop_type_store(struct config_item *item,
907 const char *page, size_t len)
908 {
909 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
910 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
911 u8 type;
912 int ret;
913
914 if (desc->opts_mutex)
915 mutex_lock(desc->opts_mutex);
916 ret = kstrtou8(page, 0, &type);
917 if (ret)
918 goto end;
919 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
920 ret = -EINVAL;
921 goto end;
922 }
923
924 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
925 ext_prop->type == USB_EXT_PROP_LE32 ||
926 ext_prop->type == USB_EXT_PROP_BE32) &&
927 (type == USB_EXT_PROP_UNICODE ||
928 type == USB_EXT_PROP_UNICODE_ENV ||
929 type == USB_EXT_PROP_UNICODE_LINK))
930 ext_prop->data_len <<= 1;
931 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
932 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
933 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
934 (type == USB_EXT_PROP_BINARY ||
935 type == USB_EXT_PROP_LE32 ||
936 type == USB_EXT_PROP_BE32))
937 ext_prop->data_len >>= 1;
938 ext_prop->type = type;
939 ret = len;
940
941 end:
942 if (desc->opts_mutex)
943 mutex_unlock(desc->opts_mutex);
944 return ret;
945 }
946
947 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
948 {
949 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
950 int len = ext_prop->data_len;
951
952 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
953 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
954 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
955 len >>= 1;
956 memcpy(page, ext_prop->data, len);
957
958 return len;
959 }
960
961 static ssize_t ext_prop_data_store(struct config_item *item,
962 const char *page, size_t len)
963 {
964 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
965 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
966 char *new_data;
967 size_t ret_len = len;
968
969 if (page[len - 1] == '\n' || page[len - 1] == '\0')
970 --len;
971 new_data = kmemdup(page, len, GFP_KERNEL);
972 if (!new_data)
973 return -ENOMEM;
974
975 if (desc->opts_mutex)
976 mutex_lock(desc->opts_mutex);
977 kfree(ext_prop->data);
978 ext_prop->data = new_data;
979 desc->ext_prop_len -= ext_prop->data_len;
980 ext_prop->data_len = len;
981 desc->ext_prop_len += ext_prop->data_len;
982 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
983 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
984 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
985 desc->ext_prop_len -= ext_prop->data_len;
986 ext_prop->data_len <<= 1;
987 ext_prop->data_len += 2;
988 desc->ext_prop_len += ext_prop->data_len;
989 }
990 if (desc->opts_mutex)
991 mutex_unlock(desc->opts_mutex);
992 return ret_len;
993 }
994
995 CONFIGFS_ATTR(ext_prop_, type);
996 CONFIGFS_ATTR(ext_prop_, data);
997
998 static struct configfs_attribute *ext_prop_attrs[] = {
999 &ext_prop_attr_type,
1000 &ext_prop_attr_data,
1001 NULL,
1002 };
1003
1004 static void usb_os_desc_ext_prop_release(struct config_item *item)
1005 {
1006 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1007
1008 kfree(ext_prop); /* frees a whole chunk */
1009 }
1010
1011 static struct configfs_item_operations ext_prop_ops = {
1012 .release = usb_os_desc_ext_prop_release,
1013 };
1014
1015 static struct config_item *ext_prop_make(
1016 struct config_group *group,
1017 const char *name)
1018 {
1019 struct usb_os_desc_ext_prop *ext_prop;
1020 struct config_item_type *ext_prop_type;
1021 struct usb_os_desc *desc;
1022 char *vlabuf;
1023
1024 vla_group(data_chunk);
1025 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1026 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1027
1028 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1029 if (!vlabuf)
1030 return ERR_PTR(-ENOMEM);
1031
1032 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1033 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1034
1035 desc = container_of(group, struct usb_os_desc, group);
1036 ext_prop_type->ct_item_ops = &ext_prop_ops;
1037 ext_prop_type->ct_attrs = ext_prop_attrs;
1038 ext_prop_type->ct_owner = desc->owner;
1039
1040 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1041
1042 ext_prop->name = kstrdup(name, GFP_KERNEL);
1043 if (!ext_prop->name) {
1044 kfree(vlabuf);
1045 return ERR_PTR(-ENOMEM);
1046 }
1047 desc->ext_prop_len += 14;
1048 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1049 if (desc->opts_mutex)
1050 mutex_lock(desc->opts_mutex);
1051 desc->ext_prop_len += ext_prop->name_len;
1052 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1053 ++desc->ext_prop_count;
1054 if (desc->opts_mutex)
1055 mutex_unlock(desc->opts_mutex);
1056
1057 return &ext_prop->item;
1058 }
1059
1060 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1061 {
1062 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1063 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1064
1065 if (desc->opts_mutex)
1066 mutex_lock(desc->opts_mutex);
1067 list_del(&ext_prop->entry);
1068 --desc->ext_prop_count;
1069 kfree(ext_prop->name);
1070 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1071 if (desc->opts_mutex)
1072 mutex_unlock(desc->opts_mutex);
1073 config_item_put(item);
1074 }
1075
1076 static struct configfs_group_operations interf_grp_ops = {
1077 .make_item = &ext_prop_make,
1078 .drop_item = &ext_prop_drop,
1079 };
1080
1081 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1082 char *page)
1083 {
1084 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1085 return 8;
1086 }
1087
1088 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1089 const char *page, size_t len)
1090 {
1091 struct usb_os_desc *desc = to_usb_os_desc(item);
1092 int l;
1093
1094 l = min_t(int, 8, len);
1095 if (page[l - 1] == '\n')
1096 --l;
1097 if (desc->opts_mutex)
1098 mutex_lock(desc->opts_mutex);
1099 memcpy(desc->ext_compat_id, page, l);
1100
1101 if (desc->opts_mutex)
1102 mutex_unlock(desc->opts_mutex);
1103
1104 return len;
1105 }
1106
1107 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1108 char *page)
1109 {
1110 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1111 return 8;
1112 }
1113
1114 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1115 const char *page, size_t len)
1116 {
1117 struct usb_os_desc *desc = to_usb_os_desc(item);
1118 int l;
1119
1120 l = min_t(int, 8, len);
1121 if (page[l - 1] == '\n')
1122 --l;
1123 if (desc->opts_mutex)
1124 mutex_lock(desc->opts_mutex);
1125 memcpy(desc->ext_compat_id + 8, page, l);
1126
1127 if (desc->opts_mutex)
1128 mutex_unlock(desc->opts_mutex);
1129
1130 return len;
1131 }
1132
1133 CONFIGFS_ATTR(interf_grp_, compatible_id);
1134 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1135
1136 static struct configfs_attribute *interf_grp_attrs[] = {
1137 &interf_grp_attr_compatible_id,
1138 &interf_grp_attr_sub_compatible_id,
1139 NULL
1140 };
1141
1142 int usb_os_desc_prepare_interf_dir(struct config_group *parent,
1143 int n_interf,
1144 struct usb_os_desc **desc,
1145 char **names,
1146 struct module *owner)
1147 {
1148 struct config_group *os_desc_group;
1149 struct config_item_type *os_desc_type, *interface_type;
1150
1151 vla_group(data_chunk);
1152 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1153 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1154 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1155
1156 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1157 if (!vlabuf)
1158 return -ENOMEM;
1159
1160 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1161 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1162 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1163
1164 os_desc_type->ct_owner = owner;
1165 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1166 configfs_add_default_group(os_desc_group, parent);
1167
1168 interface_type->ct_group_ops = &interf_grp_ops;
1169 interface_type->ct_attrs = interf_grp_attrs;
1170 interface_type->ct_owner = owner;
1171
1172 while (n_interf--) {
1173 struct usb_os_desc *d;
1174
1175 d = desc[n_interf];
1176 d->owner = owner;
1177 config_group_init_type_name(&d->group, "", interface_type);
1178 config_item_set_name(&d->group.cg_item, "interface.%s",
1179 names[n_interf]);
1180 configfs_add_default_group(&d->group, os_desc_group);
1181 }
1182
1183 return 0;
1184 }
1185 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1186
1187 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1188 {
1189 WARN_ON(1);
1190 return -EINVAL;
1191 }
1192
1193 int composite_dev_prepare(struct usb_composite_driver *composite,
1194 struct usb_composite_dev *dev);
1195
1196 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1197 struct usb_ep *ep0);
1198
1199 static void purge_configs_funcs(struct gadget_info *gi)
1200 {
1201 struct usb_configuration *c;
1202
1203 list_for_each_entry(c, &gi->cdev.configs, list) {
1204 struct usb_function *f, *tmp;
1205 struct config_usb_cfg *cfg;
1206
1207 cfg = container_of(c, struct config_usb_cfg, c);
1208
1209 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1210
1211 list_move_tail(&f->list, &cfg->func_list);
1212 if (f->unbind) {
1213 dev_dbg(&gi->cdev.gadget->dev,
1214 "unbind function '%s'/%p\n",
1215 f->name, f);
1216 f->unbind(c, f);
1217 }
1218 }
1219 c->next_interface_id = 0;
1220 memset(c->interface, 0, sizeof(c->interface));
1221 c->superspeed_plus = 0;
1222 c->superspeed = 0;
1223 c->highspeed = 0;
1224 c->fullspeed = 0;
1225 }
1226 }
1227
1228 static int configfs_composite_bind(struct usb_gadget *gadget,
1229 struct usb_gadget_driver *gdriver)
1230 {
1231 struct usb_composite_driver *composite = to_cdriver(gdriver);
1232 struct gadget_info *gi = container_of(composite,
1233 struct gadget_info, composite);
1234 struct usb_composite_dev *cdev = &gi->cdev;
1235 struct usb_configuration *c;
1236 struct usb_string *s;
1237 unsigned i;
1238 int ret;
1239
1240 /* the gi->lock is hold by the caller */
1241 cdev->gadget = gadget;
1242 set_gadget_data(gadget, cdev);
1243 ret = composite_dev_prepare(composite, cdev);
1244 if (ret)
1245 return ret;
1246 /* and now the gadget bind */
1247 ret = -EINVAL;
1248
1249 if (list_empty(&gi->cdev.configs)) {
1250 pr_err("Need at least one configuration in %s.\n",
1251 gi->composite.name);
1252 goto err_comp_cleanup;
1253 }
1254
1255
1256 list_for_each_entry(c, &gi->cdev.configs, list) {
1257 struct config_usb_cfg *cfg;
1258
1259 cfg = container_of(c, struct config_usb_cfg, c);
1260 if (list_empty(&cfg->func_list)) {
1261 pr_err("Config %s/%d of %s needs at least one function.\n",
1262 c->label, c->bConfigurationValue,
1263 gi->composite.name);
1264 goto err_comp_cleanup;
1265 }
1266 }
1267
1268 /* init all strings */
1269 if (!list_empty(&gi->string_list)) {
1270 struct gadget_strings *gs;
1271
1272 i = 0;
1273 list_for_each_entry(gs, &gi->string_list, list) {
1274
1275 gi->gstrings[i] = &gs->stringtab_dev;
1276 gs->stringtab_dev.strings = gs->strings;
1277 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1278 gs->manufacturer;
1279 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1280 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1281 i++;
1282 }
1283 gi->gstrings[i] = NULL;
1284 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1285 USB_GADGET_FIRST_AVAIL_IDX);
1286 if (IS_ERR(s)) {
1287 ret = PTR_ERR(s);
1288 goto err_comp_cleanup;
1289 }
1290
1291 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1292 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1293 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1294 }
1295
1296 if (gi->use_os_desc) {
1297 cdev->use_os_string = true;
1298 cdev->b_vendor_code = gi->b_vendor_code;
1299 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1300 }
1301
1302 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1303 struct usb_descriptor_header *usb_desc;
1304
1305 usb_desc = usb_otg_descriptor_alloc(gadget);
1306 if (!usb_desc) {
1307 ret = -ENOMEM;
1308 goto err_comp_cleanup;
1309 }
1310 usb_otg_descriptor_init(gadget, usb_desc);
1311 otg_desc[0] = usb_desc;
1312 otg_desc[1] = NULL;
1313 }
1314
1315 /* Go through all configs, attach all functions */
1316 list_for_each_entry(c, &gi->cdev.configs, list) {
1317 struct config_usb_cfg *cfg;
1318 struct usb_function *f;
1319 struct usb_function *tmp;
1320 struct gadget_config_name *cn;
1321
1322 if (gadget_is_otg(gadget))
1323 c->descriptors = otg_desc;
1324
1325 cfg = container_of(c, struct config_usb_cfg, c);
1326 if (!list_empty(&cfg->string_list)) {
1327 i = 0;
1328 list_for_each_entry(cn, &cfg->string_list, list) {
1329 cfg->gstrings[i] = &cn->stringtab_dev;
1330 cn->stringtab_dev.strings = &cn->strings;
1331 cn->strings.s = cn->configuration;
1332 i++;
1333 }
1334 cfg->gstrings[i] = NULL;
1335 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1336 if (IS_ERR(s)) {
1337 ret = PTR_ERR(s);
1338 goto err_comp_cleanup;
1339 }
1340 c->iConfiguration = s[0].id;
1341 }
1342
1343 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1344 list_del(&f->list);
1345 ret = usb_add_function(c, f);
1346 if (ret) {
1347 list_add(&f->list, &cfg->func_list);
1348 goto err_purge_funcs;
1349 }
1350 }
1351 usb_ep_autoconfig_reset(cdev->gadget);
1352 }
1353 if (cdev->use_os_string) {
1354 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1355 if (ret)
1356 goto err_purge_funcs;
1357 }
1358
1359 usb_ep_autoconfig_reset(cdev->gadget);
1360 return 0;
1361
1362 err_purge_funcs:
1363 purge_configs_funcs(gi);
1364 err_comp_cleanup:
1365 composite_dev_cleanup(cdev);
1366 return ret;
1367 }
1368
1369 static void configfs_composite_unbind(struct usb_gadget *gadget)
1370 {
1371 struct usb_composite_dev *cdev;
1372 struct gadget_info *gi;
1373
1374 /* the gi->lock is hold by the caller */
1375
1376 cdev = get_gadget_data(gadget);
1377 gi = container_of(cdev, struct gadget_info, cdev);
1378
1379 kfree(otg_desc[0]);
1380 otg_desc[0] = NULL;
1381 purge_configs_funcs(gi);
1382 composite_dev_cleanup(cdev);
1383 usb_ep_autoconfig_reset(cdev->gadget);
1384 cdev->gadget = NULL;
1385 set_gadget_data(gadget, NULL);
1386 }
1387
1388 static const struct usb_gadget_driver configfs_driver_template = {
1389 .bind = configfs_composite_bind,
1390 .unbind = configfs_composite_unbind,
1391
1392 .setup = composite_setup,
1393 .reset = composite_disconnect,
1394 .disconnect = composite_disconnect,
1395
1396 .suspend = composite_suspend,
1397 .resume = composite_resume,
1398
1399 .max_speed = USB_SPEED_SUPER,
1400 .driver = {
1401 .owner = THIS_MODULE,
1402 .name = "configfs-gadget",
1403 },
1404 .match_existing_only = 1,
1405 };
1406
1407 static struct config_group *gadgets_make(
1408 struct config_group *group,
1409 const char *name)
1410 {
1411 struct gadget_info *gi;
1412
1413 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1414 if (!gi)
1415 return ERR_PTR(-ENOMEM);
1416
1417 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1418
1419 config_group_init_type_name(&gi->functions_group, "functions",
1420 &functions_type);
1421 configfs_add_default_group(&gi->functions_group, &gi->group);
1422
1423 config_group_init_type_name(&gi->configs_group, "configs",
1424 &config_desc_type);
1425 configfs_add_default_group(&gi->configs_group, &gi->group);
1426
1427 config_group_init_type_name(&gi->strings_group, "strings",
1428 &gadget_strings_strings_type);
1429 configfs_add_default_group(&gi->strings_group, &gi->group);
1430
1431 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1432 &os_desc_type);
1433 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1434
1435 gi->composite.bind = configfs_do_nothing;
1436 gi->composite.unbind = configfs_do_nothing;
1437 gi->composite.suspend = NULL;
1438 gi->composite.resume = NULL;
1439 gi->composite.max_speed = USB_SPEED_SUPER;
1440
1441 mutex_init(&gi->lock);
1442 INIT_LIST_HEAD(&gi->string_list);
1443 INIT_LIST_HEAD(&gi->available_func);
1444
1445 composite_init_dev(&gi->cdev);
1446 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1447 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1448 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1449
1450 gi->composite.gadget_driver = configfs_driver_template;
1451
1452 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1453 gi->composite.name = gi->composite.gadget_driver.function;
1454
1455 if (!gi->composite.gadget_driver.function)
1456 goto err;
1457
1458 return &gi->group;
1459 err:
1460 kfree(gi);
1461 return ERR_PTR(-ENOMEM);
1462 }
1463
1464 static void gadgets_drop(struct config_group *group, struct config_item *item)
1465 {
1466 config_item_put(item);
1467 }
1468
1469 static struct configfs_group_operations gadgets_ops = {
1470 .make_group = &gadgets_make,
1471 .drop_item = &gadgets_drop,
1472 };
1473
1474 static struct config_item_type gadgets_type = {
1475 .ct_group_ops = &gadgets_ops,
1476 .ct_owner = THIS_MODULE,
1477 };
1478
1479 static struct configfs_subsystem gadget_subsys = {
1480 .su_group = {
1481 .cg_item = {
1482 .ci_namebuf = "usb_gadget",
1483 .ci_type = &gadgets_type,
1484 },
1485 },
1486 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1487 };
1488
1489 void unregister_gadget_item(struct config_item *item)
1490 {
1491 struct gadget_info *gi = to_gadget_info(item);
1492
1493 mutex_lock(&gi->lock);
1494 unregister_gadget(gi);
1495 mutex_unlock(&gi->lock);
1496 }
1497 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1498
1499 static int __init gadget_cfs_init(void)
1500 {
1501 int ret;
1502
1503 config_group_init(&gadget_subsys.su_group);
1504
1505 ret = configfs_register_subsystem(&gadget_subsys);
1506 return ret;
1507 }
1508 module_init(gadget_cfs_init);
1509
1510 static void __exit gadget_cfs_exit(void)
1511 {
1512 configfs_unregister_subsystem(&gadget_subsys);
1513 }
1514 module_exit(gadget_cfs_exit);
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