1// SPDX-License-Identifier: GPL-2.0
2#include <linux/configfs.h>
3#include <linux/module.h>
4#include <linux/slab.h>
5#include <linux/device.h>
6#include <linux/kstrtox.h>
7#include <linux/nls.h>
8#include <linux/usb/composite.h>
9#include <linux/usb/gadget_configfs.h>
10#include <linux/usb/webusb.h>
11#include "configfs.h"
12#include "u_f.h"
13#include "u_os_desc.h"
14
15int check_user_usb_string(const char *name,
16 struct usb_gadget_strings *stringtab_dev)
17{
18 u16 num;
19 int ret;
20
21 ret = kstrtou16(s: name, base: 0, res: &num);
22 if (ret)
23 return ret;
24
25 if (!usb_validate_langid(langid: num))
26 return -EINVAL;
27
28 stringtab_dev->language = num;
29 return 0;
30}
31
32#define MAX_NAME_LEN 40
33#define MAX_USB_STRING_LANGS 2
34
35static const struct usb_descriptor_header *otg_desc[2];
36
37struct gadget_info {
38 struct config_group group;
39 struct config_group functions_group;
40 struct config_group configs_group;
41 struct config_group strings_group;
42 struct config_group os_desc_group;
43 struct config_group webusb_group;
44
45 struct mutex lock;
46 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
47 struct list_head string_list;
48 struct list_head available_func;
49
50 struct usb_composite_driver composite;
51 struct usb_composite_dev cdev;
52 bool use_os_desc;
53 char b_vendor_code;
54 char qw_sign[OS_STRING_QW_SIGN_LEN];
55 bool use_webusb;
56 u16 bcd_webusb_version;
57 u8 b_webusb_vendor_code;
58 char landing_page[WEBUSB_URL_RAW_MAX_LENGTH];
59
60 spinlock_t spinlock;
61 bool unbind;
62};
63
64static inline struct gadget_info *to_gadget_info(struct config_item *item)
65{
66 return container_of(to_config_group(item), struct gadget_info, group);
67}
68
69struct config_usb_cfg {
70 struct config_group group;
71 struct config_group strings_group;
72 struct list_head string_list;
73 struct usb_configuration c;
74 struct list_head func_list;
75 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
76};
77
78static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
79{
80 return container_of(to_config_group(item), struct config_usb_cfg,
81 group);
82}
83
84static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg)
85{
86 return container_of(cfg->c.cdev, struct gadget_info, cdev);
87}
88
89struct gadget_language {
90 struct usb_gadget_strings stringtab_dev;
91 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
92 char *manufacturer;
93 char *product;
94 char *serialnumber;
95
96 struct config_group group;
97 struct list_head list;
98 struct list_head gadget_strings;
99 unsigned int nstrings;
100};
101
102struct gadget_config_name {
103 struct usb_gadget_strings stringtab_dev;
104 struct usb_string strings;
105 char *configuration;
106
107 struct config_group group;
108 struct list_head list;
109};
110
111#define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1)
112
113static int usb_string_copy(const char *s, char **s_copy)
114{
115 int ret;
116 char *str;
117 char *copy = *s_copy;
118 ret = strlen(s);
119 if (ret > USB_MAX_STRING_LEN)
120 return -EOVERFLOW;
121
122 if (copy) {
123 str = copy;
124 } else {
125 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
126 if (!str)
127 return -ENOMEM;
128 }
129 strcpy(p: str, q: s);
130 if (str[ret - 1] == '\n')
131 str[ret - 1] = '\0';
132 *s_copy = str;
133 return 0;
134}
135
136#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
137static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
138 char *page) \
139{ \
140 return sprintf(page, "0x%02x\n", \
141 to_gadget_info(item)->cdev.desc.__name); \
142}
143
144#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
145static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
146 char *page) \
147{ \
148 return sprintf(page, "0x%04x\n", \
149 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
150}
151
152
153#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
154static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
155 const char *page, size_t len) \
156{ \
157 u8 val; \
158 int ret; \
159 ret = kstrtou8(page, 0, &val); \
160 if (ret) \
161 return ret; \
162 to_gadget_info(item)->cdev.desc._name = val; \
163 return len; \
164}
165
166#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
167static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
168 const char *page, size_t len) \
169{ \
170 u16 val; \
171 int ret; \
172 ret = kstrtou16(page, 0, &val); \
173 if (ret) \
174 return ret; \
175 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
176 return len; \
177}
178
179#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
180 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
181 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
182
183GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
184GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
185GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
186GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
187GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
188GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
189GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
190GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
191
192static ssize_t is_valid_bcd(u16 bcd_val)
193{
194 if ((bcd_val & 0xf) > 9)
195 return -EINVAL;
196 if (((bcd_val >> 4) & 0xf) > 9)
197 return -EINVAL;
198 if (((bcd_val >> 8) & 0xf) > 9)
199 return -EINVAL;
200 if (((bcd_val >> 12) & 0xf) > 9)
201 return -EINVAL;
202 return 0;
203}
204
205static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
206 const char *page, size_t len)
207{
208 u16 bcdDevice;
209 int ret;
210
211 ret = kstrtou16(s: page, base: 0, res: &bcdDevice);
212 if (ret)
213 return ret;
214 ret = is_valid_bcd(bcd_val: bcdDevice);
215 if (ret)
216 return ret;
217
218 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
219 return len;
220}
221
222static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
223 const char *page, size_t len)
224{
225 u16 bcdUSB;
226 int ret;
227
228 ret = kstrtou16(s: page, base: 0, res: &bcdUSB);
229 if (ret)
230 return ret;
231 ret = is_valid_bcd(bcd_val: bcdUSB);
232 if (ret)
233 return ret;
234
235 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
236 return len;
237}
238
239static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
240{
241 struct gadget_info *gi = to_gadget_info(item);
242 char *udc_name;
243 int ret;
244
245 mutex_lock(&gi->lock);
246 udc_name = gi->composite.gadget_driver.udc_name;
247 ret = sprintf(buf: page, fmt: "%s\n", udc_name ?: "");
248 mutex_unlock(lock: &gi->lock);
249
250 return ret;
251}
252
253static int unregister_gadget(struct gadget_info *gi)
254{
255 int ret;
256
257 if (!gi->composite.gadget_driver.udc_name)
258 return -ENODEV;
259
260 ret = usb_gadget_unregister_driver(driver: &gi->composite.gadget_driver);
261 if (ret)
262 return ret;
263 kfree(objp: gi->composite.gadget_driver.udc_name);
264 gi->composite.gadget_driver.udc_name = NULL;
265 return 0;
266}
267
268static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
269 const char *page, size_t len)
270{
271 struct gadget_info *gi = to_gadget_info(item);
272 char *name;
273 int ret;
274
275 if (strlen(page) < len)
276 return -EOVERFLOW;
277
278 name = kstrdup(s: page, GFP_KERNEL);
279 if (!name)
280 return -ENOMEM;
281 if (name[len - 1] == '\n')
282 name[len - 1] = '\0';
283
284 mutex_lock(&gi->lock);
285
286 if (!strlen(name)) {
287 ret = unregister_gadget(gi);
288 if (ret)
289 goto err;
290 kfree(objp: name);
291 } else {
292 if (gi->composite.gadget_driver.udc_name) {
293 ret = -EBUSY;
294 goto err;
295 }
296 gi->composite.gadget_driver.udc_name = name;
297 ret = usb_gadget_register_driver(&gi->composite.gadget_driver);
298 if (ret) {
299 gi->composite.gadget_driver.udc_name = NULL;
300 goto err;
301 }
302 }
303 mutex_unlock(lock: &gi->lock);
304 return len;
305err:
306 kfree(objp: name);
307 mutex_unlock(lock: &gi->lock);
308 return ret;
309}
310
311static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
312 char *page)
313{
314 enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
315
316 return sprintf(buf: page, fmt: "%s\n", usb_speed_string(speed));
317}
318
319static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
320 const char *page, size_t len)
321{
322 struct gadget_info *gi = to_gadget_info(item);
323
324 mutex_lock(&gi->lock);
325
326 /* Prevent changing of max_speed after the driver is binded */
327 if (gi->composite.gadget_driver.udc_name)
328 goto err;
329
330 if (strncmp(page, "super-speed-plus", 16) == 0)
331 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
332 else if (strncmp(page, "super-speed", 11) == 0)
333 gi->composite.max_speed = USB_SPEED_SUPER;
334 else if (strncmp(page, "high-speed", 10) == 0)
335 gi->composite.max_speed = USB_SPEED_HIGH;
336 else if (strncmp(page, "full-speed", 10) == 0)
337 gi->composite.max_speed = USB_SPEED_FULL;
338 else if (strncmp(page, "low-speed", 9) == 0)
339 gi->composite.max_speed = USB_SPEED_LOW;
340 else
341 goto err;
342
343 gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
344
345 mutex_unlock(lock: &gi->lock);
346 return len;
347err:
348 mutex_unlock(lock: &gi->lock);
349 return -EINVAL;
350}
351
352CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
353CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
354CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
355CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
356CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
357CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
358CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
359CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
360CONFIGFS_ATTR(gadget_dev_desc_, UDC);
361CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
362
363static struct configfs_attribute *gadget_root_attrs[] = {
364 &gadget_dev_desc_attr_bDeviceClass,
365 &gadget_dev_desc_attr_bDeviceSubClass,
366 &gadget_dev_desc_attr_bDeviceProtocol,
367 &gadget_dev_desc_attr_bMaxPacketSize0,
368 &gadget_dev_desc_attr_idVendor,
369 &gadget_dev_desc_attr_idProduct,
370 &gadget_dev_desc_attr_bcdDevice,
371 &gadget_dev_desc_attr_bcdUSB,
372 &gadget_dev_desc_attr_UDC,
373 &gadget_dev_desc_attr_max_speed,
374 NULL,
375};
376
377static inline struct gadget_language *to_gadget_language(struct config_item *item)
378{
379 return container_of(to_config_group(item), struct gadget_language,
380 group);
381}
382
383static inline struct gadget_config_name *to_gadget_config_name(
384 struct config_item *item)
385{
386 return container_of(to_config_group(item), struct gadget_config_name,
387 group);
388}
389
390static inline struct usb_function_instance *to_usb_function_instance(
391 struct config_item *item)
392{
393 return container_of(to_config_group(item),
394 struct usb_function_instance, group);
395}
396
397static void gadget_info_attr_release(struct config_item *item)
398{
399 struct gadget_info *gi = to_gadget_info(item);
400
401 WARN_ON(!list_empty(&gi->cdev.configs));
402 WARN_ON(!list_empty(&gi->string_list));
403 WARN_ON(!list_empty(&gi->available_func));
404 kfree(objp: gi->composite.gadget_driver.function);
405 kfree(objp: gi->composite.gadget_driver.driver.name);
406 kfree(objp: gi);
407}
408
409static struct configfs_item_operations gadget_root_item_ops = {
410 .release = gadget_info_attr_release,
411};
412
413static void gadget_config_attr_release(struct config_item *item)
414{
415 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
416
417 WARN_ON(!list_empty(&cfg->c.functions));
418 list_del(entry: &cfg->c.list);
419 kfree(objp: cfg->c.label);
420 kfree(objp: cfg);
421}
422
423static int config_usb_cfg_link(
424 struct config_item *usb_cfg_ci,
425 struct config_item *usb_func_ci)
426{
427 struct config_usb_cfg *cfg = to_config_usb_cfg(item: usb_cfg_ci);
428 struct gadget_info *gi = cfg_to_gadget_info(cfg);
429
430 struct usb_function_instance *fi =
431 to_usb_function_instance(item: usb_func_ci);
432 struct usb_function_instance *a_fi = NULL, *iter;
433 struct usb_function *f;
434 int ret;
435
436 mutex_lock(&gi->lock);
437 /*
438 * Make sure this function is from within our _this_ gadget and not
439 * from another gadget or a random directory.
440 * Also a function instance can only be linked once.
441 */
442
443 if (gi->composite.gadget_driver.udc_name) {
444 ret = -EINVAL;
445 goto out;
446 }
447
448 list_for_each_entry(iter, &gi->available_func, cfs_list) {
449 if (iter != fi)
450 continue;
451 a_fi = iter;
452 break;
453 }
454 if (!a_fi) {
455 ret = -EINVAL;
456 goto out;
457 }
458
459 list_for_each_entry(f, &cfg->func_list, list) {
460 if (f->fi == fi) {
461 ret = -EEXIST;
462 goto out;
463 }
464 }
465
466 f = usb_get_function(fi);
467 if (IS_ERR(ptr: f)) {
468 ret = PTR_ERR(ptr: f);
469 goto out;
470 }
471
472 /* stash the function until we bind it to the gadget */
473 list_add_tail(new: &f->list, head: &cfg->func_list);
474 ret = 0;
475out:
476 mutex_unlock(lock: &gi->lock);
477 return ret;
478}
479
480static void config_usb_cfg_unlink(
481 struct config_item *usb_cfg_ci,
482 struct config_item *usb_func_ci)
483{
484 struct config_usb_cfg *cfg = to_config_usb_cfg(item: usb_cfg_ci);
485 struct gadget_info *gi = cfg_to_gadget_info(cfg);
486
487 struct usb_function_instance *fi =
488 to_usb_function_instance(item: usb_func_ci);
489 struct usb_function *f;
490
491 /*
492 * ideally I would like to forbid to unlink functions while a gadget is
493 * bound to an UDC. Since this isn't possible at the moment, we simply
494 * force an unbind, the function is available here and then we can
495 * remove the function.
496 */
497 mutex_lock(&gi->lock);
498 if (gi->composite.gadget_driver.udc_name)
499 unregister_gadget(gi);
500 WARN_ON(gi->composite.gadget_driver.udc_name);
501
502 list_for_each_entry(f, &cfg->func_list, list) {
503 if (f->fi == fi) {
504 list_del(entry: &f->list);
505 usb_put_function(f);
506 mutex_unlock(lock: &gi->lock);
507 return;
508 }
509 }
510 mutex_unlock(lock: &gi->lock);
511 WARN(1, "Unable to locate function to unbind\n");
512}
513
514static struct configfs_item_operations gadget_config_item_ops = {
515 .release = gadget_config_attr_release,
516 .allow_link = config_usb_cfg_link,
517 .drop_link = config_usb_cfg_unlink,
518};
519
520
521static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
522 char *page)
523{
524 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
525
526 return sprintf(buf: page, fmt: "%u\n", cfg->c.MaxPower);
527}
528
529static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
530 const char *page, size_t len)
531{
532 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
533 u16 val;
534 int ret;
535 ret = kstrtou16(s: page, base: 0, res: &val);
536 if (ret)
537 return ret;
538 if (DIV_ROUND_UP(val, 8) > 0xff)
539 return -ERANGE;
540 cfg->c.MaxPower = val;
541 return len;
542}
543
544static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
545 char *page)
546{
547 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
548
549 return sprintf(buf: page, fmt: "0x%02x\n", cfg->c.bmAttributes);
550}
551
552static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
553 const char *page, size_t len)
554{
555 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
556 u8 val;
557 int ret;
558 ret = kstrtou8(s: page, base: 0, res: &val);
559 if (ret)
560 return ret;
561 if (!(val & USB_CONFIG_ATT_ONE))
562 return -EINVAL;
563 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
564 USB_CONFIG_ATT_WAKEUP))
565 return -EINVAL;
566 cfg->c.bmAttributes = val;
567 return len;
568}
569
570CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
571CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
572
573static struct configfs_attribute *gadget_config_attrs[] = {
574 &gadget_config_desc_attr_MaxPower,
575 &gadget_config_desc_attr_bmAttributes,
576 NULL,
577};
578
579static const struct config_item_type gadget_config_type = {
580 .ct_item_ops = &gadget_config_item_ops,
581 .ct_attrs = gadget_config_attrs,
582 .ct_owner = THIS_MODULE,
583};
584
585static const struct config_item_type gadget_root_type = {
586 .ct_item_ops = &gadget_root_item_ops,
587 .ct_attrs = gadget_root_attrs,
588 .ct_owner = THIS_MODULE,
589};
590
591static void composite_init_dev(struct usb_composite_dev *cdev)
592{
593 spin_lock_init(&cdev->lock);
594 INIT_LIST_HEAD(list: &cdev->configs);
595 INIT_LIST_HEAD(list: &cdev->gstrings);
596}
597
598static struct config_group *function_make(
599 struct config_group *group,
600 const char *name)
601{
602 struct gadget_info *gi;
603 struct usb_function_instance *fi;
604 char buf[MAX_NAME_LEN];
605 char *func_name;
606 char *instance_name;
607 int ret;
608
609 ret = snprintf(buf, MAX_NAME_LEN, fmt: "%s", name);
610 if (ret >= MAX_NAME_LEN)
611 return ERR_PTR(error: -ENAMETOOLONG);
612
613 func_name = buf;
614 instance_name = strchr(func_name, '.');
615 if (!instance_name) {
616 pr_err("Unable to locate . in FUNC.INSTANCE\n");
617 return ERR_PTR(error: -EINVAL);
618 }
619 *instance_name = '\0';
620 instance_name++;
621
622 fi = usb_get_function_instance(name: func_name);
623 if (IS_ERR(ptr: fi))
624 return ERR_CAST(ptr: fi);
625
626 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
627 if (ret) {
628 usb_put_function_instance(fi);
629 return ERR_PTR(error: ret);
630 }
631 if (fi->set_inst_name) {
632 ret = fi->set_inst_name(fi, instance_name);
633 if (ret) {
634 usb_put_function_instance(fi);
635 return ERR_PTR(error: ret);
636 }
637 }
638
639 gi = container_of(group, struct gadget_info, functions_group);
640
641 mutex_lock(&gi->lock);
642 list_add_tail(new: &fi->cfs_list, head: &gi->available_func);
643 mutex_unlock(lock: &gi->lock);
644 return &fi->group;
645}
646
647static void function_drop(
648 struct config_group *group,
649 struct config_item *item)
650{
651 struct usb_function_instance *fi = to_usb_function_instance(item);
652 struct gadget_info *gi;
653
654 gi = container_of(group, struct gadget_info, functions_group);
655
656 mutex_lock(&gi->lock);
657 list_del(entry: &fi->cfs_list);
658 mutex_unlock(lock: &gi->lock);
659 config_item_put(item);
660}
661
662static struct configfs_group_operations functions_ops = {
663 .make_group = &function_make,
664 .drop_item = &function_drop,
665};
666
667static const struct config_item_type functions_type = {
668 .ct_group_ops = &functions_ops,
669 .ct_owner = THIS_MODULE,
670};
671
672GS_STRINGS_RW(gadget_config_name, configuration);
673
674static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
675 &gadget_config_name_attr_configuration,
676 NULL,
677};
678
679static void gadget_config_name_attr_release(struct config_item *item)
680{
681 struct gadget_config_name *cn = to_gadget_config_name(item);
682
683 kfree(objp: cn->configuration);
684
685 list_del(entry: &cn->list);
686 kfree(objp: cn);
687}
688
689USB_CONFIG_STRING_RW_OPS(gadget_config_name);
690USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
691
692static struct config_group *config_desc_make(
693 struct config_group *group,
694 const char *name)
695{
696 struct gadget_info *gi;
697 struct config_usb_cfg *cfg;
698 char buf[MAX_NAME_LEN];
699 char *num_str;
700 u8 num;
701 int ret;
702
703 gi = container_of(group, struct gadget_info, configs_group);
704 ret = snprintf(buf, MAX_NAME_LEN, fmt: "%s", name);
705 if (ret >= MAX_NAME_LEN)
706 return ERR_PTR(error: -ENAMETOOLONG);
707
708 num_str = strchr(buf, '.');
709 if (!num_str) {
710 pr_err("Unable to locate . in name.bConfigurationValue\n");
711 return ERR_PTR(error: -EINVAL);
712 }
713
714 *num_str = '\0';
715 num_str++;
716
717 if (!strlen(buf))
718 return ERR_PTR(error: -EINVAL);
719
720 ret = kstrtou8(s: num_str, base: 0, res: &num);
721 if (ret)
722 return ERR_PTR(error: ret);
723
724 cfg = kzalloc(size: sizeof(*cfg), GFP_KERNEL);
725 if (!cfg)
726 return ERR_PTR(error: -ENOMEM);
727 cfg->c.label = kstrdup(s: buf, GFP_KERNEL);
728 if (!cfg->c.label) {
729 ret = -ENOMEM;
730 goto err;
731 }
732 cfg->c.bConfigurationValue = num;
733 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
734 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
735 INIT_LIST_HEAD(list: &cfg->string_list);
736 INIT_LIST_HEAD(list: &cfg->func_list);
737
738 config_group_init_type_name(group: &cfg->group, name,
739 type: &gadget_config_type);
740
741 config_group_init_type_name(group: &cfg->strings_group, name: "strings",
742 type: &gadget_config_name_strings_type);
743 configfs_add_default_group(new_group: &cfg->strings_group, group: &cfg->group);
744
745 ret = usb_add_config_only(cdev: &gi->cdev, config: &cfg->c);
746 if (ret)
747 goto err;
748
749 return &cfg->group;
750err:
751 kfree(objp: cfg->c.label);
752 kfree(objp: cfg);
753 return ERR_PTR(error: ret);
754}
755
756static void config_desc_drop(
757 struct config_group *group,
758 struct config_item *item)
759{
760 config_item_put(item);
761}
762
763static struct configfs_group_operations config_desc_ops = {
764 .make_group = &config_desc_make,
765 .drop_item = &config_desc_drop,
766};
767
768static const struct config_item_type config_desc_type = {
769 .ct_group_ops = &config_desc_ops,
770 .ct_owner = THIS_MODULE,
771};
772
773GS_STRINGS_RW(gadget_language, manufacturer);
774GS_STRINGS_RW(gadget_language, product);
775GS_STRINGS_RW(gadget_language, serialnumber);
776
777static struct configfs_attribute *gadget_language_langid_attrs[] = {
778 &gadget_language_attr_manufacturer,
779 &gadget_language_attr_product,
780 &gadget_language_attr_serialnumber,
781 NULL,
782};
783
784static void gadget_language_attr_release(struct config_item *item)
785{
786 struct gadget_language *gs = to_gadget_language(item);
787
788 kfree(objp: gs->manufacturer);
789 kfree(objp: gs->product);
790 kfree(objp: gs->serialnumber);
791
792 list_del(entry: &gs->list);
793 kfree(objp: gs);
794}
795
796static struct configfs_item_operations gadget_language_langid_item_ops = {
797 .release = gadget_language_attr_release,
798};
799
800static ssize_t gadget_string_id_show(struct config_item *item, char *page)
801{
802 struct gadget_string *string = to_gadget_string(item);
803 int ret;
804
805 ret = sprintf(buf: page, fmt: "%u\n", string->usb_string.id);
806 return ret;
807}
808CONFIGFS_ATTR_RO(gadget_string_, id);
809
810static ssize_t gadget_string_s_show(struct config_item *item, char *page)
811{
812 struct gadget_string *string = to_gadget_string(item);
813 int ret;
814
815 ret = snprintf(buf: page, size: sizeof(string->string), fmt: "%s\n", string->string);
816 return ret;
817}
818
819static ssize_t gadget_string_s_store(struct config_item *item, const char *page,
820 size_t len)
821{
822 struct gadget_string *string = to_gadget_string(item);
823 int size = min(sizeof(string->string), len + 1);
824
825 if (len > USB_MAX_STRING_LEN)
826 return -EINVAL;
827
828 return strscpy(p: string->string, q: page, size);
829}
830CONFIGFS_ATTR(gadget_string_, s);
831
832static struct configfs_attribute *gadget_string_attrs[] = {
833 &gadget_string_attr_id,
834 &gadget_string_attr_s,
835 NULL,
836};
837
838static void gadget_string_release(struct config_item *item)
839{
840 struct gadget_string *string = to_gadget_string(item);
841
842 kfree(objp: string);
843}
844
845static struct configfs_item_operations gadget_string_item_ops = {
846 .release = gadget_string_release,
847};
848
849static const struct config_item_type gadget_string_type = {
850 .ct_item_ops = &gadget_string_item_ops,
851 .ct_attrs = gadget_string_attrs,
852 .ct_owner = THIS_MODULE,
853};
854
855static struct config_item *gadget_language_string_make(struct config_group *group,
856 const char *name)
857{
858 struct gadget_language *language;
859 struct gadget_string *string;
860
861 language = to_gadget_language(item: &group->cg_item);
862
863 string = kzalloc(size: sizeof(*string), GFP_KERNEL);
864 if (!string)
865 return ERR_PTR(error: -ENOMEM);
866
867 string->usb_string.id = language->nstrings++;
868 string->usb_string.s = string->string;
869 list_add_tail(new: &string->list, head: &language->gadget_strings);
870
871 config_item_init_type_name(item: &string->item, name, type: &gadget_string_type);
872
873 return &string->item;
874}
875
876static void gadget_language_string_drop(struct config_group *group,
877 struct config_item *item)
878{
879 struct gadget_language *language;
880 struct gadget_string *string;
881 unsigned int i = USB_GADGET_FIRST_AVAIL_IDX;
882
883 language = to_gadget_language(item: &group->cg_item);
884 string = to_gadget_string(item);
885
886 list_del(entry: &string->list);
887 language->nstrings--;
888
889 /* Reset the ids for the language's strings to guarantee a continuous set */
890 list_for_each_entry(string, &language->gadget_strings, list)
891 string->usb_string.id = i++;
892}
893
894static struct configfs_group_operations gadget_language_langid_group_ops = {
895 .make_item = gadget_language_string_make,
896 .drop_item = gadget_language_string_drop,
897};
898
899static struct config_item_type gadget_language_type = {
900 .ct_item_ops = &gadget_language_langid_item_ops,
901 .ct_group_ops = &gadget_language_langid_group_ops,
902 .ct_attrs = gadget_language_langid_attrs,
903 .ct_owner = THIS_MODULE,
904};
905
906static struct config_group *gadget_language_make(struct config_group *group,
907 const char *name)
908{
909 struct gadget_info *gi;
910 struct gadget_language *gs;
911 struct gadget_language *new;
912 int langs = 0;
913 int ret;
914
915 new = kzalloc(size: sizeof(*new), GFP_KERNEL);
916 if (!new)
917 return ERR_PTR(error: -ENOMEM);
918
919 ret = check_user_usb_string(name, stringtab_dev: &new->stringtab_dev);
920 if (ret)
921 goto err;
922 config_group_init_type_name(group: &new->group, name,
923 type: &gadget_language_type);
924
925 gi = container_of(group, struct gadget_info, strings_group);
926 ret = -EEXIST;
927 list_for_each_entry(gs, &gi->string_list, list) {
928 if (gs->stringtab_dev.language == new->stringtab_dev.language)
929 goto err;
930 langs++;
931 }
932 ret = -EOVERFLOW;
933 if (langs >= MAX_USB_STRING_LANGS)
934 goto err;
935
936 list_add_tail(new: &new->list, head: &gi->string_list);
937 INIT_LIST_HEAD(list: &new->gadget_strings);
938
939 /* We have the default manufacturer, product and serialnumber strings */
940 new->nstrings = 3;
941 return &new->group;
942err:
943 kfree(objp: new);
944 return ERR_PTR(error: ret);
945}
946
947static void gadget_language_drop(struct config_group *group,
948 struct config_item *item)
949{
950 config_item_put(item);
951}
952
953static struct configfs_group_operations gadget_language_group_ops = {
954 .make_group = &gadget_language_make,
955 .drop_item = &gadget_language_drop,
956};
957
958static struct config_item_type gadget_language_strings_type = {
959 .ct_group_ops = &gadget_language_group_ops,
960 .ct_owner = THIS_MODULE,
961};
962
963static inline struct gadget_info *webusb_item_to_gadget_info(
964 struct config_item *item)
965{
966 return container_of(to_config_group(item),
967 struct gadget_info, webusb_group);
968}
969
970static ssize_t webusb_use_show(struct config_item *item, char *page)
971{
972 return sysfs_emit(buf: page, fmt: "%d\n",
973 webusb_item_to_gadget_info(item)->use_webusb);
974}
975
976static ssize_t webusb_use_store(struct config_item *item, const char *page,
977 size_t len)
978{
979 struct gadget_info *gi = webusb_item_to_gadget_info(item);
980 int ret;
981 bool use;
982
983 ret = kstrtobool(s: page, res: &use);
984 if (ret)
985 return ret;
986
987 mutex_lock(&gi->lock);
988 gi->use_webusb = use;
989 mutex_unlock(lock: &gi->lock);
990
991 return len;
992}
993
994static ssize_t webusb_bcdVersion_show(struct config_item *item, char *page)
995{
996 return sysfs_emit(buf: page, fmt: "0x%04x\n",
997 webusb_item_to_gadget_info(item)->bcd_webusb_version);
998}
999
1000static ssize_t webusb_bcdVersion_store(struct config_item *item,
1001 const char *page, size_t len)
1002{
1003 struct gadget_info *gi = webusb_item_to_gadget_info(item);
1004 u16 bcdVersion;
1005 int ret;
1006
1007 ret = kstrtou16(s: page, base: 0, res: &bcdVersion);
1008 if (ret)
1009 return ret;
1010
1011 ret = is_valid_bcd(bcd_val: bcdVersion);
1012 if (ret)
1013 return ret;
1014
1015 mutex_lock(&gi->lock);
1016 gi->bcd_webusb_version = bcdVersion;
1017 mutex_unlock(lock: &gi->lock);
1018
1019 return len;
1020}
1021
1022static ssize_t webusb_bVendorCode_show(struct config_item *item, char *page)
1023{
1024 return sysfs_emit(buf: page, fmt: "0x%02x\n",
1025 webusb_item_to_gadget_info(item)->b_webusb_vendor_code);
1026}
1027
1028static ssize_t webusb_bVendorCode_store(struct config_item *item,
1029 const char *page, size_t len)
1030{
1031 struct gadget_info *gi = webusb_item_to_gadget_info(item);
1032 int ret;
1033 u8 b_vendor_code;
1034
1035 ret = kstrtou8(s: page, base: 0, res: &b_vendor_code);
1036 if (ret)
1037 return ret;
1038
1039 mutex_lock(&gi->lock);
1040 gi->b_webusb_vendor_code = b_vendor_code;
1041 mutex_unlock(lock: &gi->lock);
1042
1043 return len;
1044}
1045
1046static ssize_t webusb_landingPage_show(struct config_item *item, char *page)
1047{
1048 return sysfs_emit(buf: page, fmt: "%s\n", webusb_item_to_gadget_info(item)->landing_page);
1049}
1050
1051static ssize_t webusb_landingPage_store(struct config_item *item, const char *page,
1052 size_t len)
1053{
1054 struct gadget_info *gi = webusb_item_to_gadget_info(item);
1055 unsigned int bytes_to_strip = 0;
1056 int l = len;
1057
1058 if (page[l - 1] == '\n') {
1059 --l;
1060 ++bytes_to_strip;
1061 }
1062
1063 if (l > sizeof(gi->landing_page)) {
1064 pr_err("webusb: landingPage URL too long\n");
1065 return -EINVAL;
1066 }
1067
1068 // validation
1069 if (strncasecmp(s1: page, s2: "https://", n: 8) == 0)
1070 bytes_to_strip = 8;
1071 else if (strncasecmp(s1: page, s2: "http://", n: 7) == 0)
1072 bytes_to_strip = 7;
1073 else
1074 bytes_to_strip = 0;
1075
1076 if (l > U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + bytes_to_strip) {
1077 pr_err("webusb: landingPage URL %d bytes too long for given URL scheme\n",
1078 l - U8_MAX + WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH - bytes_to_strip);
1079 return -EINVAL;
1080 }
1081
1082 mutex_lock(&gi->lock);
1083 // ensure 0 bytes are set, in case the new landing page is shorter then the old one.
1084 memcpy_and_pad(dest: gi->landing_page, dest_len: sizeof(gi->landing_page), src: page, count: l, pad: 0);
1085 mutex_unlock(lock: &gi->lock);
1086
1087 return len;
1088}
1089
1090CONFIGFS_ATTR(webusb_, use);
1091CONFIGFS_ATTR(webusb_, bVendorCode);
1092CONFIGFS_ATTR(webusb_, bcdVersion);
1093CONFIGFS_ATTR(webusb_, landingPage);
1094
1095static struct configfs_attribute *webusb_attrs[] = {
1096 &webusb_attr_use,
1097 &webusb_attr_bcdVersion,
1098 &webusb_attr_bVendorCode,
1099 &webusb_attr_landingPage,
1100 NULL,
1101};
1102
1103static struct config_item_type webusb_type = {
1104 .ct_attrs = webusb_attrs,
1105 .ct_owner = THIS_MODULE,
1106};
1107
1108static inline struct gadget_info *os_desc_item_to_gadget_info(
1109 struct config_item *item)
1110{
1111 return container_of(to_config_group(item),
1112 struct gadget_info, os_desc_group);
1113}
1114
1115static ssize_t os_desc_use_show(struct config_item *item, char *page)
1116{
1117 return sprintf(buf: page, fmt: "%d\n",
1118 os_desc_item_to_gadget_info(item)->use_os_desc);
1119}
1120
1121static ssize_t os_desc_use_store(struct config_item *item, const char *page,
1122 size_t len)
1123{
1124 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1125 int ret;
1126 bool use;
1127
1128 ret = kstrtobool(s: page, res: &use);
1129 if (ret)
1130 return ret;
1131
1132 mutex_lock(&gi->lock);
1133 gi->use_os_desc = use;
1134 mutex_unlock(lock: &gi->lock);
1135
1136 return len;
1137}
1138
1139static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
1140{
1141 return sprintf(buf: page, fmt: "0x%02x\n",
1142 os_desc_item_to_gadget_info(item)->b_vendor_code);
1143}
1144
1145static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
1146 const char *page, size_t len)
1147{
1148 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1149 int ret;
1150 u8 b_vendor_code;
1151
1152 ret = kstrtou8(s: page, base: 0, res: &b_vendor_code);
1153 if (ret)
1154 return ret;
1155
1156 mutex_lock(&gi->lock);
1157 gi->b_vendor_code = b_vendor_code;
1158 mutex_unlock(lock: &gi->lock);
1159
1160 return len;
1161}
1162
1163static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
1164{
1165 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1166 int res;
1167
1168 res = utf16s_to_utf8s(pwcs: (wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
1169 endian: UTF16_LITTLE_ENDIAN, s: page, PAGE_SIZE - 1);
1170 page[res++] = '\n';
1171
1172 return res;
1173}
1174
1175static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
1176 size_t len)
1177{
1178 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1179 int res, l;
1180
1181 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
1182 if (page[l - 1] == '\n')
1183 --l;
1184
1185 mutex_lock(&gi->lock);
1186 res = utf8s_to_utf16s(s: page, len: l,
1187 endian: UTF16_LITTLE_ENDIAN, pwcs: (wchar_t *) gi->qw_sign,
1188 OS_STRING_QW_SIGN_LEN);
1189 if (res > 0)
1190 res = len;
1191 mutex_unlock(lock: &gi->lock);
1192
1193 return res;
1194}
1195
1196CONFIGFS_ATTR(os_desc_, use);
1197CONFIGFS_ATTR(os_desc_, b_vendor_code);
1198CONFIGFS_ATTR(os_desc_, qw_sign);
1199
1200static struct configfs_attribute *os_desc_attrs[] = {
1201 &os_desc_attr_use,
1202 &os_desc_attr_b_vendor_code,
1203 &os_desc_attr_qw_sign,
1204 NULL,
1205};
1206
1207static int os_desc_link(struct config_item *os_desc_ci,
1208 struct config_item *usb_cfg_ci)
1209{
1210 struct gadget_info *gi = os_desc_item_to_gadget_info(item: os_desc_ci);
1211 struct usb_composite_dev *cdev = &gi->cdev;
1212 struct config_usb_cfg *c_target = to_config_usb_cfg(item: usb_cfg_ci);
1213 struct usb_configuration *c = NULL, *iter;
1214 int ret;
1215
1216 mutex_lock(&gi->lock);
1217 list_for_each_entry(iter, &cdev->configs, list) {
1218 if (iter != &c_target->c)
1219 continue;
1220 c = iter;
1221 break;
1222 }
1223 if (!c) {
1224 ret = -EINVAL;
1225 goto out;
1226 }
1227
1228 if (cdev->os_desc_config) {
1229 ret = -EBUSY;
1230 goto out;
1231 }
1232
1233 cdev->os_desc_config = &c_target->c;
1234 ret = 0;
1235
1236out:
1237 mutex_unlock(lock: &gi->lock);
1238 return ret;
1239}
1240
1241static void os_desc_unlink(struct config_item *os_desc_ci,
1242 struct config_item *usb_cfg_ci)
1243{
1244 struct gadget_info *gi = os_desc_item_to_gadget_info(item: os_desc_ci);
1245 struct usb_composite_dev *cdev = &gi->cdev;
1246
1247 mutex_lock(&gi->lock);
1248 if (gi->composite.gadget_driver.udc_name)
1249 unregister_gadget(gi);
1250 cdev->os_desc_config = NULL;
1251 WARN_ON(gi->composite.gadget_driver.udc_name);
1252 mutex_unlock(lock: &gi->lock);
1253}
1254
1255static struct configfs_item_operations os_desc_ops = {
1256 .allow_link = os_desc_link,
1257 .drop_link = os_desc_unlink,
1258};
1259
1260static struct config_item_type os_desc_type = {
1261 .ct_item_ops = &os_desc_ops,
1262 .ct_attrs = os_desc_attrs,
1263 .ct_owner = THIS_MODULE,
1264};
1265
1266static inline struct usb_os_desc_ext_prop
1267*to_usb_os_desc_ext_prop(struct config_item *item)
1268{
1269 return container_of(item, struct usb_os_desc_ext_prop, item);
1270}
1271
1272static ssize_t ext_prop_type_show(struct config_item *item, char *page)
1273{
1274 return sprintf(buf: page, fmt: "%d\n", to_usb_os_desc_ext_prop(item)->type);
1275}
1276
1277static ssize_t ext_prop_type_store(struct config_item *item,
1278 const char *page, size_t len)
1279{
1280 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1281 struct usb_os_desc *desc = to_usb_os_desc(item: ext_prop->item.ci_parent);
1282 u8 type;
1283 int ret;
1284
1285 ret = kstrtou8(s: page, base: 0, res: &type);
1286 if (ret)
1287 return ret;
1288
1289 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI)
1290 return -EINVAL;
1291
1292 if (desc->opts_mutex)
1293 mutex_lock(desc->opts_mutex);
1294
1295 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
1296 ext_prop->type == USB_EXT_PROP_LE32 ||
1297 ext_prop->type == USB_EXT_PROP_BE32) &&
1298 (type == USB_EXT_PROP_UNICODE ||
1299 type == USB_EXT_PROP_UNICODE_ENV ||
1300 type == USB_EXT_PROP_UNICODE_LINK))
1301 ext_prop->data_len <<= 1;
1302 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
1303 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1304 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
1305 (type == USB_EXT_PROP_BINARY ||
1306 type == USB_EXT_PROP_LE32 ||
1307 type == USB_EXT_PROP_BE32))
1308 ext_prop->data_len >>= 1;
1309 ext_prop->type = type;
1310
1311 if (desc->opts_mutex)
1312 mutex_unlock(lock: desc->opts_mutex);
1313 return len;
1314}
1315
1316static ssize_t ext_prop_data_show(struct config_item *item, char *page)
1317{
1318 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1319 int len = ext_prop->data_len;
1320
1321 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1322 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1323 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1324 len >>= 1;
1325 memcpy(page, ext_prop->data, len);
1326
1327 return len;
1328}
1329
1330static ssize_t ext_prop_data_store(struct config_item *item,
1331 const char *page, size_t len)
1332{
1333 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1334 struct usb_os_desc *desc = to_usb_os_desc(item: ext_prop->item.ci_parent);
1335 char *new_data;
1336 size_t ret_len = len;
1337
1338 if (page[len - 1] == '\n' || page[len - 1] == '\0')
1339 --len;
1340 new_data = kmemdup(p: page, size: len, GFP_KERNEL);
1341 if (!new_data)
1342 return -ENOMEM;
1343
1344 if (desc->opts_mutex)
1345 mutex_lock(desc->opts_mutex);
1346 kfree(objp: ext_prop->data);
1347 ext_prop->data = new_data;
1348 desc->ext_prop_len -= ext_prop->data_len;
1349 ext_prop->data_len = len;
1350 desc->ext_prop_len += ext_prop->data_len;
1351 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1352 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1353 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1354 desc->ext_prop_len -= ext_prop->data_len;
1355 ext_prop->data_len <<= 1;
1356 ext_prop->data_len += 2;
1357 desc->ext_prop_len += ext_prop->data_len;
1358 }
1359 if (desc->opts_mutex)
1360 mutex_unlock(lock: desc->opts_mutex);
1361 return ret_len;
1362}
1363
1364CONFIGFS_ATTR(ext_prop_, type);
1365CONFIGFS_ATTR(ext_prop_, data);
1366
1367static struct configfs_attribute *ext_prop_attrs[] = {
1368 &ext_prop_attr_type,
1369 &ext_prop_attr_data,
1370 NULL,
1371};
1372
1373static void usb_os_desc_ext_prop_release(struct config_item *item)
1374{
1375 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1376
1377 kfree(objp: ext_prop); /* frees a whole chunk */
1378}
1379
1380static struct configfs_item_operations ext_prop_ops = {
1381 .release = usb_os_desc_ext_prop_release,
1382};
1383
1384static struct config_item *ext_prop_make(
1385 struct config_group *group,
1386 const char *name)
1387{
1388 struct usb_os_desc_ext_prop *ext_prop;
1389 struct config_item_type *ext_prop_type;
1390 struct usb_os_desc *desc;
1391 char *vlabuf;
1392
1393 vla_group(data_chunk);
1394 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1395 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1396
1397 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1398 if (!vlabuf)
1399 return ERR_PTR(error: -ENOMEM);
1400
1401 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1402 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1403
1404 desc = container_of(group, struct usb_os_desc, group);
1405 ext_prop_type->ct_item_ops = &ext_prop_ops;
1406 ext_prop_type->ct_attrs = ext_prop_attrs;
1407 ext_prop_type->ct_owner = desc->owner;
1408
1409 config_item_init_type_name(item: &ext_prop->item, name, type: ext_prop_type);
1410
1411 ext_prop->name = kstrdup(s: name, GFP_KERNEL);
1412 if (!ext_prop->name) {
1413 kfree(objp: vlabuf);
1414 return ERR_PTR(error: -ENOMEM);
1415 }
1416 desc->ext_prop_len += 14;
1417 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1418 if (desc->opts_mutex)
1419 mutex_lock(desc->opts_mutex);
1420 desc->ext_prop_len += ext_prop->name_len;
1421 list_add_tail(new: &ext_prop->entry, head: &desc->ext_prop);
1422 ++desc->ext_prop_count;
1423 if (desc->opts_mutex)
1424 mutex_unlock(lock: desc->opts_mutex);
1425
1426 return &ext_prop->item;
1427}
1428
1429static void ext_prop_drop(struct config_group *group, struct config_item *item)
1430{
1431 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1432 struct usb_os_desc *desc = to_usb_os_desc(item: &group->cg_item);
1433
1434 if (desc->opts_mutex)
1435 mutex_lock(desc->opts_mutex);
1436 list_del(entry: &ext_prop->entry);
1437 --desc->ext_prop_count;
1438 kfree(objp: ext_prop->name);
1439 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1440 if (desc->opts_mutex)
1441 mutex_unlock(lock: desc->opts_mutex);
1442 config_item_put(item);
1443}
1444
1445static struct configfs_group_operations interf_grp_ops = {
1446 .make_item = &ext_prop_make,
1447 .drop_item = &ext_prop_drop,
1448};
1449
1450static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1451 char *page)
1452{
1453 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1454 return 8;
1455}
1456
1457static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1458 const char *page, size_t len)
1459{
1460 struct usb_os_desc *desc = to_usb_os_desc(item);
1461 int l;
1462
1463 l = min_t(int, 8, len);
1464 if (page[l - 1] == '\n')
1465 --l;
1466 if (desc->opts_mutex)
1467 mutex_lock(desc->opts_mutex);
1468 memcpy(desc->ext_compat_id, page, l);
1469
1470 if (desc->opts_mutex)
1471 mutex_unlock(lock: desc->opts_mutex);
1472
1473 return len;
1474}
1475
1476static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1477 char *page)
1478{
1479 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1480 return 8;
1481}
1482
1483static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1484 const char *page, size_t len)
1485{
1486 struct usb_os_desc *desc = to_usb_os_desc(item);
1487 int l;
1488
1489 l = min_t(int, 8, len);
1490 if (page[l - 1] == '\n')
1491 --l;
1492 if (desc->opts_mutex)
1493 mutex_lock(desc->opts_mutex);
1494 memcpy(desc->ext_compat_id + 8, page, l);
1495
1496 if (desc->opts_mutex)
1497 mutex_unlock(lock: desc->opts_mutex);
1498
1499 return len;
1500}
1501
1502CONFIGFS_ATTR(interf_grp_, compatible_id);
1503CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1504
1505static struct configfs_attribute *interf_grp_attrs[] = {
1506 &interf_grp_attr_compatible_id,
1507 &interf_grp_attr_sub_compatible_id,
1508 NULL
1509};
1510
1511struct config_group *usb_os_desc_prepare_interf_dir(
1512 struct config_group *parent,
1513 int n_interf,
1514 struct usb_os_desc **desc,
1515 char **names,
1516 struct module *owner)
1517{
1518 struct config_group *os_desc_group;
1519 struct config_item_type *os_desc_type, *interface_type;
1520
1521 vla_group(data_chunk);
1522 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1523 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1524 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1525
1526 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1527 if (!vlabuf)
1528 return ERR_PTR(error: -ENOMEM);
1529
1530 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1531 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1532 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1533
1534 os_desc_type->ct_owner = owner;
1535 config_group_init_type_name(group: os_desc_group, name: "os_desc", type: os_desc_type);
1536 configfs_add_default_group(new_group: os_desc_group, group: parent);
1537
1538 interface_type->ct_group_ops = &interf_grp_ops;
1539 interface_type->ct_attrs = interf_grp_attrs;
1540 interface_type->ct_owner = owner;
1541
1542 while (n_interf--) {
1543 struct usb_os_desc *d;
1544
1545 d = desc[n_interf];
1546 d->owner = owner;
1547 config_group_init_type_name(group: &d->group, name: "", type: interface_type);
1548 config_item_set_name(&d->group.cg_item, "interface.%s",
1549 names[n_interf]);
1550 configfs_add_default_group(new_group: &d->group, group: os_desc_group);
1551 }
1552
1553 return os_desc_group;
1554}
1555EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1556
1557static int configfs_do_nothing(struct usb_composite_dev *cdev)
1558{
1559 WARN_ON(1);
1560 return -EINVAL;
1561}
1562
1563int composite_dev_prepare(struct usb_composite_driver *composite,
1564 struct usb_composite_dev *dev);
1565
1566int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1567 struct usb_ep *ep0);
1568
1569static void purge_configs_funcs(struct gadget_info *gi)
1570{
1571 struct usb_configuration *c;
1572
1573 list_for_each_entry(c, &gi->cdev.configs, list) {
1574 struct usb_function *f, *tmp;
1575 struct config_usb_cfg *cfg;
1576
1577 cfg = container_of(c, struct config_usb_cfg, c);
1578
1579 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1580
1581 list_move(list: &f->list, head: &cfg->func_list);
1582 if (f->unbind) {
1583 dev_dbg(&gi->cdev.gadget->dev,
1584 "unbind function '%s'/%p\n",
1585 f->name, f);
1586 f->unbind(c, f);
1587 }
1588 }
1589 c->next_interface_id = 0;
1590 memset(c->interface, 0, sizeof(c->interface));
1591 c->superspeed_plus = 0;
1592 c->superspeed = 0;
1593 c->highspeed = 0;
1594 c->fullspeed = 0;
1595 }
1596}
1597
1598static struct usb_string *
1599configfs_attach_gadget_strings(struct gadget_info *gi)
1600{
1601 struct usb_gadget_strings **gadget_strings;
1602 struct gadget_language *language;
1603 struct gadget_string *string;
1604 unsigned int nlangs = 0;
1605 struct list_head *iter;
1606 struct usb_string *us;
1607 unsigned int i = 0;
1608 int nstrings = -1;
1609 unsigned int j;
1610
1611 list_for_each(iter, &gi->string_list)
1612 nlangs++;
1613
1614 /* Bail out early if no languages are configured */
1615 if (!nlangs)
1616 return NULL;
1617
1618 gadget_strings = kcalloc(n: nlangs + 1, /* including NULL terminator */
1619 size: sizeof(struct usb_gadget_strings *), GFP_KERNEL);
1620 if (!gadget_strings)
1621 return ERR_PTR(error: -ENOMEM);
1622
1623 list_for_each_entry(language, &gi->string_list, list) {
1624 struct usb_string *stringtab;
1625
1626 if (nstrings == -1) {
1627 nstrings = language->nstrings;
1628 } else if (nstrings != language->nstrings) {
1629 pr_err("languages must contain the same number of strings\n");
1630 us = ERR_PTR(error: -EINVAL);
1631 goto cleanup;
1632 }
1633
1634 stringtab = kcalloc(n: language->nstrings + 1, size: sizeof(struct usb_string),
1635 GFP_KERNEL);
1636 if (!stringtab) {
1637 us = ERR_PTR(error: -ENOMEM);
1638 goto cleanup;
1639 }
1640
1641 stringtab[USB_GADGET_MANUFACTURER_IDX].id = USB_GADGET_MANUFACTURER_IDX;
1642 stringtab[USB_GADGET_MANUFACTURER_IDX].s = language->manufacturer;
1643 stringtab[USB_GADGET_PRODUCT_IDX].id = USB_GADGET_PRODUCT_IDX;
1644 stringtab[USB_GADGET_PRODUCT_IDX].s = language->product;
1645 stringtab[USB_GADGET_SERIAL_IDX].id = USB_GADGET_SERIAL_IDX;
1646 stringtab[USB_GADGET_SERIAL_IDX].s = language->serialnumber;
1647
1648 j = USB_GADGET_FIRST_AVAIL_IDX;
1649 list_for_each_entry(string, &language->gadget_strings, list) {
1650 memcpy(&stringtab[j], &string->usb_string, sizeof(struct usb_string));
1651 j++;
1652 }
1653
1654 language->stringtab_dev.strings = stringtab;
1655 gadget_strings[i] = &language->stringtab_dev;
1656 i++;
1657 }
1658
1659 us = usb_gstrings_attach(cdev: &gi->cdev, sp: gadget_strings, n_strings: nstrings);
1660
1661cleanup:
1662 list_for_each_entry(language, &gi->string_list, list) {
1663 kfree(objp: language->stringtab_dev.strings);
1664 language->stringtab_dev.strings = NULL;
1665 }
1666
1667 kfree(objp: gadget_strings);
1668
1669 return us;
1670}
1671
1672static int configfs_composite_bind(struct usb_gadget *gadget,
1673 struct usb_gadget_driver *gdriver)
1674{
1675 struct usb_composite_driver *composite = to_cdriver(gdrv: gdriver);
1676 struct gadget_info *gi = container_of(composite,
1677 struct gadget_info, composite);
1678 struct usb_composite_dev *cdev = &gi->cdev;
1679 struct usb_configuration *c;
1680 struct usb_string *s;
1681 unsigned i;
1682 int ret;
1683
1684 /* the gi->lock is hold by the caller */
1685 gi->unbind = 0;
1686 cdev->gadget = gadget;
1687 set_gadget_data(gadget, data: cdev);
1688 ret = composite_dev_prepare(composite, dev: cdev);
1689 if (ret)
1690 return ret;
1691 /* and now the gadget bind */
1692 ret = -EINVAL;
1693
1694 if (list_empty(head: &gi->cdev.configs)) {
1695 pr_err("Need at least one configuration in %s.\n",
1696 gi->composite.name);
1697 goto err_comp_cleanup;
1698 }
1699
1700
1701 list_for_each_entry(c, &gi->cdev.configs, list) {
1702 struct config_usb_cfg *cfg;
1703
1704 cfg = container_of(c, struct config_usb_cfg, c);
1705 if (list_empty(head: &cfg->func_list)) {
1706 pr_err("Config %s/%d of %s needs at least one function.\n",
1707 c->label, c->bConfigurationValue,
1708 gi->composite.name);
1709 goto err_comp_cleanup;
1710 }
1711 }
1712
1713 /* init all strings */
1714 if (!list_empty(head: &gi->string_list)) {
1715 s = configfs_attach_gadget_strings(gi);
1716 if (IS_ERR(ptr: s)) {
1717 ret = PTR_ERR(ptr: s);
1718 goto err_comp_cleanup;
1719 }
1720
1721 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1722 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1723 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1724
1725 gi->cdev.usb_strings = s;
1726 }
1727
1728 if (gi->use_webusb) {
1729 cdev->use_webusb = true;
1730 cdev->bcd_webusb_version = gi->bcd_webusb_version;
1731 cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code;
1732 memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH);
1733 }
1734
1735 if (gi->use_os_desc) {
1736 cdev->use_os_string = true;
1737 cdev->b_vendor_code = gi->b_vendor_code;
1738 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1739 }
1740
1741 if (gadget_is_otg(g: gadget) && !otg_desc[0]) {
1742 struct usb_descriptor_header *usb_desc;
1743
1744 usb_desc = usb_otg_descriptor_alloc(gadget);
1745 if (!usb_desc) {
1746 ret = -ENOMEM;
1747 goto err_comp_cleanup;
1748 }
1749 usb_otg_descriptor_init(gadget, otg_desc: usb_desc);
1750 otg_desc[0] = usb_desc;
1751 otg_desc[1] = NULL;
1752 }
1753
1754 /* Go through all configs, attach all functions */
1755 list_for_each_entry(c, &gi->cdev.configs, list) {
1756 struct config_usb_cfg *cfg;
1757 struct usb_function *f;
1758 struct usb_function *tmp;
1759 struct gadget_config_name *cn;
1760
1761 if (gadget_is_otg(g: gadget))
1762 c->descriptors = otg_desc;
1763
1764 /* Properly configure the bmAttributes wakeup bit */
1765 check_remote_wakeup_config(g: gadget, c);
1766
1767 cfg = container_of(c, struct config_usb_cfg, c);
1768 if (!list_empty(head: &cfg->string_list)) {
1769 i = 0;
1770 list_for_each_entry(cn, &cfg->string_list, list) {
1771 cfg->gstrings[i] = &cn->stringtab_dev;
1772 cn->stringtab_dev.strings = &cn->strings;
1773 cn->strings.s = cn->configuration;
1774 i++;
1775 }
1776 cfg->gstrings[i] = NULL;
1777 s = usb_gstrings_attach(cdev: &gi->cdev, sp: cfg->gstrings, n_strings: 1);
1778 if (IS_ERR(ptr: s)) {
1779 ret = PTR_ERR(ptr: s);
1780 goto err_comp_cleanup;
1781 }
1782 c->iConfiguration = s[0].id;
1783 }
1784
1785 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1786 list_del(entry: &f->list);
1787 ret = usb_add_function(c, f);
1788 if (ret) {
1789 list_add(new: &f->list, head: &cfg->func_list);
1790 goto err_purge_funcs;
1791 }
1792 }
1793 ret = usb_gadget_check_config(gadget: cdev->gadget);
1794 if (ret)
1795 goto err_purge_funcs;
1796
1797 usb_ep_autoconfig_reset(cdev->gadget);
1798 }
1799 if (cdev->use_os_string) {
1800 ret = composite_os_desc_req_prepare(cdev, ep0: gadget->ep0);
1801 if (ret)
1802 goto err_purge_funcs;
1803 }
1804
1805 usb_ep_autoconfig_reset(cdev->gadget);
1806 return 0;
1807
1808err_purge_funcs:
1809 purge_configs_funcs(gi);
1810err_comp_cleanup:
1811 composite_dev_cleanup(cdev);
1812 return ret;
1813}
1814
1815static void configfs_composite_unbind(struct usb_gadget *gadget)
1816{
1817 struct usb_composite_dev *cdev;
1818 struct gadget_info *gi;
1819 unsigned long flags;
1820
1821 /* the gi->lock is hold by the caller */
1822
1823 cdev = get_gadget_data(gadget);
1824 gi = container_of(cdev, struct gadget_info, cdev);
1825 spin_lock_irqsave(&gi->spinlock, flags);
1826 gi->unbind = 1;
1827 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1828
1829 kfree(objp: otg_desc[0]);
1830 otg_desc[0] = NULL;
1831 purge_configs_funcs(gi);
1832 composite_dev_cleanup(cdev);
1833 usb_ep_autoconfig_reset(cdev->gadget);
1834 spin_lock_irqsave(&gi->spinlock, flags);
1835 cdev->gadget = NULL;
1836 cdev->deactivations = 0;
1837 gadget->deactivated = false;
1838 set_gadget_data(gadget, NULL);
1839 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1840}
1841
1842static int configfs_composite_setup(struct usb_gadget *gadget,
1843 const struct usb_ctrlrequest *ctrl)
1844{
1845 struct usb_composite_dev *cdev;
1846 struct gadget_info *gi;
1847 unsigned long flags;
1848 int ret;
1849
1850 cdev = get_gadget_data(gadget);
1851 if (!cdev)
1852 return 0;
1853
1854 gi = container_of(cdev, struct gadget_info, cdev);
1855 spin_lock_irqsave(&gi->spinlock, flags);
1856 cdev = get_gadget_data(gadget);
1857 if (!cdev || gi->unbind) {
1858 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1859 return 0;
1860 }
1861
1862 ret = composite_setup(gadget, ctrl);
1863 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1864 return ret;
1865}
1866
1867static void configfs_composite_disconnect(struct usb_gadget *gadget)
1868{
1869 struct usb_composite_dev *cdev;
1870 struct gadget_info *gi;
1871 unsigned long flags;
1872
1873 cdev = get_gadget_data(gadget);
1874 if (!cdev)
1875 return;
1876
1877 gi = container_of(cdev, struct gadget_info, cdev);
1878 spin_lock_irqsave(&gi->spinlock, flags);
1879 cdev = get_gadget_data(gadget);
1880 if (!cdev || gi->unbind) {
1881 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1882 return;
1883 }
1884
1885 composite_disconnect(gadget);
1886 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1887}
1888
1889static void configfs_composite_reset(struct usb_gadget *gadget)
1890{
1891 struct usb_composite_dev *cdev;
1892 struct gadget_info *gi;
1893 unsigned long flags;
1894
1895 cdev = get_gadget_data(gadget);
1896 if (!cdev)
1897 return;
1898
1899 gi = container_of(cdev, struct gadget_info, cdev);
1900 spin_lock_irqsave(&gi->spinlock, flags);
1901 cdev = get_gadget_data(gadget);
1902 if (!cdev || gi->unbind) {
1903 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1904 return;
1905 }
1906
1907 composite_reset(gadget);
1908 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1909}
1910
1911static void configfs_composite_suspend(struct usb_gadget *gadget)
1912{
1913 struct usb_composite_dev *cdev;
1914 struct gadget_info *gi;
1915 unsigned long flags;
1916
1917 cdev = get_gadget_data(gadget);
1918 if (!cdev)
1919 return;
1920
1921 gi = container_of(cdev, struct gadget_info, cdev);
1922 spin_lock_irqsave(&gi->spinlock, flags);
1923 cdev = get_gadget_data(gadget);
1924 if (!cdev || gi->unbind) {
1925 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1926 return;
1927 }
1928
1929 composite_suspend(gadget);
1930 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1931}
1932
1933static void configfs_composite_resume(struct usb_gadget *gadget)
1934{
1935 struct usb_composite_dev *cdev;
1936 struct gadget_info *gi;
1937 unsigned long flags;
1938
1939 cdev = get_gadget_data(gadget);
1940 if (!cdev)
1941 return;
1942
1943 gi = container_of(cdev, struct gadget_info, cdev);
1944 spin_lock_irqsave(&gi->spinlock, flags);
1945 cdev = get_gadget_data(gadget);
1946 if (!cdev || gi->unbind) {
1947 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1948 return;
1949 }
1950
1951 composite_resume(gadget);
1952 spin_unlock_irqrestore(lock: &gi->spinlock, flags);
1953}
1954
1955static const struct usb_gadget_driver configfs_driver_template = {
1956 .bind = configfs_composite_bind,
1957 .unbind = configfs_composite_unbind,
1958
1959 .setup = configfs_composite_setup,
1960 .reset = configfs_composite_reset,
1961 .disconnect = configfs_composite_disconnect,
1962
1963 .suspend = configfs_composite_suspend,
1964 .resume = configfs_composite_resume,
1965
1966 .max_speed = USB_SPEED_SUPER_PLUS,
1967 .driver = {
1968 .owner = THIS_MODULE,
1969 },
1970 .match_existing_only = 1,
1971};
1972
1973static struct config_group *gadgets_make(
1974 struct config_group *group,
1975 const char *name)
1976{
1977 struct gadget_info *gi;
1978
1979 gi = kzalloc(size: sizeof(*gi), GFP_KERNEL);
1980 if (!gi)
1981 return ERR_PTR(error: -ENOMEM);
1982
1983 config_group_init_type_name(group: &gi->group, name, type: &gadget_root_type);
1984
1985 config_group_init_type_name(group: &gi->functions_group, name: "functions",
1986 type: &functions_type);
1987 configfs_add_default_group(new_group: &gi->functions_group, group: &gi->group);
1988
1989 config_group_init_type_name(group: &gi->configs_group, name: "configs",
1990 type: &config_desc_type);
1991 configfs_add_default_group(new_group: &gi->configs_group, group: &gi->group);
1992
1993 config_group_init_type_name(group: &gi->strings_group, name: "strings",
1994 type: &gadget_language_strings_type);
1995 configfs_add_default_group(new_group: &gi->strings_group, group: &gi->group);
1996
1997 config_group_init_type_name(group: &gi->os_desc_group, name: "os_desc",
1998 type: &os_desc_type);
1999 configfs_add_default_group(new_group: &gi->os_desc_group, group: &gi->group);
2000
2001 config_group_init_type_name(group: &gi->webusb_group, name: "webusb",
2002 type: &webusb_type);
2003 configfs_add_default_group(new_group: &gi->webusb_group, group: &gi->group);
2004
2005 gi->composite.bind = configfs_do_nothing;
2006 gi->composite.unbind = configfs_do_nothing;
2007 gi->composite.suspend = NULL;
2008 gi->composite.resume = NULL;
2009 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
2010
2011 spin_lock_init(&gi->spinlock);
2012 mutex_init(&gi->lock);
2013 INIT_LIST_HEAD(list: &gi->string_list);
2014 INIT_LIST_HEAD(list: &gi->available_func);
2015
2016 composite_init_dev(cdev: &gi->cdev);
2017 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
2018 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
2019 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
2020
2021 gi->composite.gadget_driver = configfs_driver_template;
2022
2023 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL,
2024 fmt: "configfs-gadget.%s", name);
2025 if (!gi->composite.gadget_driver.driver.name)
2026 goto err;
2027
2028 gi->composite.gadget_driver.function = kstrdup(s: name, GFP_KERNEL);
2029 gi->composite.name = gi->composite.gadget_driver.function;
2030
2031 if (!gi->composite.gadget_driver.function)
2032 goto out_free_driver_name;
2033
2034 return &gi->group;
2035
2036out_free_driver_name:
2037 kfree(objp: gi->composite.gadget_driver.driver.name);
2038err:
2039 kfree(objp: gi);
2040 return ERR_PTR(error: -ENOMEM);
2041}
2042
2043static void gadgets_drop(struct config_group *group, struct config_item *item)
2044{
2045 config_item_put(item);
2046}
2047
2048static struct configfs_group_operations gadgets_ops = {
2049 .make_group = &gadgets_make,
2050 .drop_item = &gadgets_drop,
2051};
2052
2053static const struct config_item_type gadgets_type = {
2054 .ct_group_ops = &gadgets_ops,
2055 .ct_owner = THIS_MODULE,
2056};
2057
2058static struct configfs_subsystem gadget_subsys = {
2059 .su_group = {
2060 .cg_item = {
2061 .ci_namebuf = "usb_gadget",
2062 .ci_type = &gadgets_type,
2063 },
2064 },
2065 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
2066};
2067
2068void unregister_gadget_item(struct config_item *item)
2069{
2070 struct gadget_info *gi = to_gadget_info(item);
2071
2072 mutex_lock(&gi->lock);
2073 unregister_gadget(gi);
2074 mutex_unlock(lock: &gi->lock);
2075}
2076EXPORT_SYMBOL_GPL(unregister_gadget_item);
2077
2078static int __init gadget_cfs_init(void)
2079{
2080 int ret;
2081
2082 config_group_init(group: &gadget_subsys.su_group);
2083
2084 ret = configfs_register_subsystem(subsys: &gadget_subsys);
2085 return ret;
2086}
2087module_init(gadget_cfs_init);
2088
2089static void __exit gadget_cfs_exit(void)
2090{
2091 configfs_unregister_subsystem(subsys: &gadget_subsys);
2092}
2093module_exit(gadget_cfs_exit);
2094

source code of linux/drivers/usb/gadget/configfs.c