1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/configfs.h>
3 #include <linux/module.h>
4 #include <linux/slab.h>
5 #include <linux/device.h>
6 #include <linux/nls.h>
7 #include <linux/usb/composite.h>
8 #include <linux/usb/gadget_configfs.h>
9 #include "configfs.h"
10 #include "u_f.h"
11 #include "u_os_desc.h"
12
13 #ifdef CONFIG_USB_CONFIGFS_UEVENT
14 #include <linux/platform_device.h>
15 #include <linux/kdev_t.h>
16 #include <linux/usb/ch9.h>
17
18 #ifdef CONFIG_USB_CONFIGFS_F_ACC
19 extern int acc_ctrlrequest_composite(struct usb_composite_dev *cdev,
20 const struct usb_ctrlrequest *ctrl);
21 void acc_disconnect(void);
22 #endif
23 static struct class *android_class;
24 static struct device *android_device;
25 static int index;
26 static int gadget_index;
27
create_function_device(char * name)28 struct device *create_function_device(char *name)
29 {
30 if (android_device && !IS_ERR(android_device))
31 return device_create(android_class, android_device,
32 MKDEV(0, index++), NULL, name);
33 else
34 return ERR_PTR(-EINVAL);
35 }
36 EXPORT_SYMBOL_GPL(create_function_device);
37 #endif
38
check_user_usb_string(const char * name,struct usb_gadget_strings * stringtab_dev)39 int check_user_usb_string(const char *name,
40 struct usb_gadget_strings *stringtab_dev)
41 {
42 u16 num;
43 int ret;
44
45 ret = kstrtou16(name, 0, &num);
46 if (ret)
47 return ret;
48
49 if (!usb_validate_langid(num))
50 return -EINVAL;
51
52 stringtab_dev->language = num;
53 return 0;
54 }
55
56 #define MAX_NAME_LEN 40
57 #define MAX_USB_STRING_LANGS 2
58
59 static const struct usb_descriptor_header *otg_desc[2];
60
61 struct gadget_info {
62 struct config_group group;
63 struct config_group functions_group;
64 struct config_group configs_group;
65 struct config_group strings_group;
66 struct config_group os_desc_group;
67
68 struct mutex lock;
69 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
70 struct list_head string_list;
71 struct list_head available_func;
72
73 struct usb_composite_driver composite;
74 struct usb_composite_dev cdev;
75 bool use_os_desc;
76 char b_vendor_code;
77 char qw_sign[OS_STRING_QW_SIGN_LEN];
78 spinlock_t spinlock;
79 bool unbind;
80 #ifdef CONFIG_USB_CONFIGFS_UEVENT
81 bool connected;
82 bool sw_connected;
83 struct work_struct work;
84 struct device *dev;
85 #endif
86 };
87
to_gadget_info(struct config_item * item)88 static inline struct gadget_info *to_gadget_info(struct config_item *item)
89 {
90 return container_of(to_config_group(item), struct gadget_info, group);
91 }
92
93 struct config_usb_cfg {
94 struct config_group group;
95 struct config_group strings_group;
96 struct list_head string_list;
97 struct usb_configuration c;
98 struct list_head func_list;
99 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
100 };
101
to_config_usb_cfg(struct config_item * item)102 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
103 {
104 return container_of(to_config_group(item), struct config_usb_cfg,
105 group);
106 }
107
cfg_to_gadget_info(struct config_usb_cfg * cfg)108 static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg)
109 {
110 return container_of(cfg->c.cdev, struct gadget_info, cdev);
111 }
112
113 struct gadget_strings {
114 struct usb_gadget_strings stringtab_dev;
115 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
116 char *manufacturer;
117 char *product;
118 char *serialnumber;
119
120 struct config_group group;
121 struct list_head list;
122 };
123
124 struct gadget_config_name {
125 struct usb_gadget_strings stringtab_dev;
126 struct usb_string strings;
127 char *configuration;
128
129 struct config_group group;
130 struct list_head list;
131 };
132
133 #define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1)
134
usb_string_copy(const char * s,char ** s_copy)135 static int usb_string_copy(const char *s, char **s_copy)
136 {
137 int ret;
138 char *str;
139 char *copy = *s_copy;
140 ret = strlen(s);
141 if (ret > USB_MAX_STRING_LEN)
142 return -EOVERFLOW;
143
144 if (copy) {
145 str = copy;
146 } else {
147 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
148 if (!str)
149 return -ENOMEM;
150 }
151 strcpy(str, s);
152 if (str[ret - 1] == '\n')
153 str[ret - 1] = '\0';
154 *s_copy = str;
155 return 0;
156 }
157
158 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
159 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
160 char *page) \
161 { \
162 return sprintf(page, "0x%02x\n", \
163 to_gadget_info(item)->cdev.desc.__name); \
164 }
165
166 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
167 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
168 char *page) \
169 { \
170 return sprintf(page, "0x%04x\n", \
171 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
172 }
173
174
175 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
176 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
177 const char *page, size_t len) \
178 { \
179 u8 val; \
180 int ret; \
181 ret = kstrtou8(page, 0, &val); \
182 if (ret) \
183 return ret; \
184 to_gadget_info(item)->cdev.desc._name = val; \
185 return len; \
186 }
187
188 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
189 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
190 const char *page, size_t len) \
191 { \
192 u16 val; \
193 int ret; \
194 ret = kstrtou16(page, 0, &val); \
195 if (ret) \
196 return ret; \
197 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
198 return len; \
199 }
200
201 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
202 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
203 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
204
205 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
206 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
207 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
208 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
209 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
210 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
211 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
212 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
213
is_valid_bcd(u16 bcd_val)214 static ssize_t is_valid_bcd(u16 bcd_val)
215 {
216 if ((bcd_val & 0xf) > 9)
217 return -EINVAL;
218 if (((bcd_val >> 4) & 0xf) > 9)
219 return -EINVAL;
220 if (((bcd_val >> 8) & 0xf) > 9)
221 return -EINVAL;
222 if (((bcd_val >> 12) & 0xf) > 9)
223 return -EINVAL;
224 return 0;
225 }
226
gadget_dev_desc_bcdDevice_store(struct config_item * item,const char * page,size_t len)227 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
228 const char *page, size_t len)
229 {
230 u16 bcdDevice;
231 int ret;
232
233 ret = kstrtou16(page, 0, &bcdDevice);
234 if (ret)
235 return ret;
236 ret = is_valid_bcd(bcdDevice);
237 if (ret)
238 return ret;
239
240 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
241 return len;
242 }
243
gadget_dev_desc_bcdUSB_store(struct config_item * item,const char * page,size_t len)244 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
245 const char *page, size_t len)
246 {
247 u16 bcdUSB;
248 int ret;
249
250 ret = kstrtou16(page, 0, &bcdUSB);
251 if (ret)
252 return ret;
253 ret = is_valid_bcd(bcdUSB);
254 if (ret)
255 return ret;
256
257 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
258 return len;
259 }
260
gadget_dev_desc_UDC_show(struct config_item * item,char * page)261 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
262 {
263 struct gadget_info *gi = to_gadget_info(item);
264 char *udc_name;
265 int ret;
266
267 mutex_lock(&gi->lock);
268 udc_name = gi->composite.gadget_driver.udc_name;
269 ret = sprintf(page, "%s\n", udc_name ?: "");
270 mutex_unlock(&gi->lock);
271
272 return ret;
273 }
274
unregister_gadget(struct gadget_info * gi)275 static int unregister_gadget(struct gadget_info *gi)
276 {
277 int ret;
278
279 if (!gi->composite.gadget_driver.udc_name)
280 return -ENODEV;
281
282 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
283 if (ret)
284 return ret;
285 kfree(gi->composite.gadget_driver.udc_name);
286 gi->composite.gadget_driver.udc_name = NULL;
287 return 0;
288 }
289
gadget_dev_desc_UDC_store(struct config_item * item,const char * page,size_t len)290 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
291 const char *page, size_t len)
292 {
293 struct gadget_info *gi = to_gadget_info(item);
294 char *name;
295 int ret;
296
297 if (strlen(page) < len)
298 return -EOVERFLOW;
299
300 name = kstrdup(page, GFP_KERNEL);
301 if (!name)
302 return -ENOMEM;
303 if (name[len - 1] == '\n')
304 name[len - 1] = '\0';
305
306 mutex_lock(&gi->lock);
307
308 if (!strlen(name) || strcmp(name, "none") == 0) {
309 ret = unregister_gadget(gi);
310 if (ret)
311 goto err;
312 kfree(name);
313 } else {
314 if (gi->composite.gadget_driver.udc_name) {
315 ret = -EBUSY;
316 goto err;
317 }
318 gi->composite.gadget_driver.udc_name = name;
319 ret = usb_gadget_register_driver(&gi->composite.gadget_driver);
320 if (ret) {
321 gi->composite.gadget_driver.udc_name = NULL;
322 goto err;
323 }
324 }
325 mutex_unlock(&gi->lock);
326 return len;
327 err:
328 kfree(name);
329 mutex_unlock(&gi->lock);
330 return ret;
331 }
332
gadget_dev_desc_max_speed_show(struct config_item * item,char * page)333 static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
334 char *page)
335 {
336 enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
337
338 return sprintf(page, "%s\n", usb_speed_string(speed));
339 }
340
gadget_dev_desc_max_speed_store(struct config_item * item,const char * page,size_t len)341 static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
342 const char *page, size_t len)
343 {
344 struct gadget_info *gi = to_gadget_info(item);
345
346 mutex_lock(&gi->lock);
347
348 /* Prevent changing of max_speed after the driver is binded */
349 if (gi->composite.gadget_driver.udc_name)
350 goto err;
351
352 if (strncmp(page, "super-speed-plus", 16) == 0)
353 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
354 else if (strncmp(page, "super-speed", 11) == 0)
355 gi->composite.max_speed = USB_SPEED_SUPER;
356 else if (strncmp(page, "high-speed", 10) == 0)
357 gi->composite.max_speed = USB_SPEED_HIGH;
358 else if (strncmp(page, "full-speed", 10) == 0)
359 gi->composite.max_speed = USB_SPEED_FULL;
360 else if (strncmp(page, "low-speed", 9) == 0)
361 gi->composite.max_speed = USB_SPEED_LOW;
362 else
363 goto err;
364
365 gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
366
367 mutex_unlock(&gi->lock);
368 return len;
369 err:
370 mutex_unlock(&gi->lock);
371 return -EINVAL;
372 }
373
374 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
375 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
376 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
377 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
378 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
379 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
380 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
381 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
382 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
383 CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
384
385 static struct configfs_attribute *gadget_root_attrs[] = {
386 &gadget_dev_desc_attr_bDeviceClass,
387 &gadget_dev_desc_attr_bDeviceSubClass,
388 &gadget_dev_desc_attr_bDeviceProtocol,
389 &gadget_dev_desc_attr_bMaxPacketSize0,
390 &gadget_dev_desc_attr_idVendor,
391 &gadget_dev_desc_attr_idProduct,
392 &gadget_dev_desc_attr_bcdDevice,
393 &gadget_dev_desc_attr_bcdUSB,
394 &gadget_dev_desc_attr_UDC,
395 &gadget_dev_desc_attr_max_speed,
396 NULL,
397 };
398
to_gadget_strings(struct config_item * item)399 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
400 {
401 return container_of(to_config_group(item), struct gadget_strings,
402 group);
403 }
404
to_gadget_config_name(struct config_item * item)405 static inline struct gadget_config_name *to_gadget_config_name(
406 struct config_item *item)
407 {
408 return container_of(to_config_group(item), struct gadget_config_name,
409 group);
410 }
411
to_usb_function_instance(struct config_item * item)412 static inline struct usb_function_instance *to_usb_function_instance(
413 struct config_item *item)
414 {
415 return container_of(to_config_group(item),
416 struct usb_function_instance, group);
417 }
418
gadget_info_attr_release(struct config_item * item)419 static void gadget_info_attr_release(struct config_item *item)
420 {
421 struct gadget_info *gi = to_gadget_info(item);
422
423 WARN_ON(!list_empty(&gi->cdev.configs));
424 WARN_ON(!list_empty(&gi->string_list));
425 WARN_ON(!list_empty(&gi->available_func));
426 kfree(gi->composite.gadget_driver.function);
427 kfree(gi->composite.gadget_driver.driver.name);
428 kfree(gi);
429 }
430
431 static struct configfs_item_operations gadget_root_item_ops = {
432 .release = gadget_info_attr_release,
433 };
434
gadget_config_attr_release(struct config_item * item)435 static void gadget_config_attr_release(struct config_item *item)
436 {
437 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
438
439 WARN_ON(!list_empty(&cfg->c.functions));
440 list_del(&cfg->c.list);
441 kfree(cfg->c.label);
442 kfree(cfg);
443 }
444
config_usb_cfg_link(struct config_item * usb_cfg_ci,struct config_item * usb_func_ci)445 static int config_usb_cfg_link(
446 struct config_item *usb_cfg_ci,
447 struct config_item *usb_func_ci)
448 {
449 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
450 struct gadget_info *gi = cfg_to_gadget_info(cfg);
451
452 struct usb_function_instance *fi =
453 to_usb_function_instance(usb_func_ci);
454 struct usb_function_instance *a_fi = NULL, *iter;
455 struct usb_function *f;
456 int ret;
457
458 mutex_lock(&gi->lock);
459 /*
460 * Make sure this function is from within our _this_ gadget and not
461 * from another gadget or a random directory.
462 * Also a function instance can only be linked once.
463 */
464
465 if (gi->composite.gadget_driver.udc_name) {
466 ret = -EINVAL;
467 goto out;
468 }
469
470 list_for_each_entry(iter, &gi->available_func, cfs_list) {
471 if (iter != fi)
472 continue;
473 a_fi = iter;
474 break;
475 }
476 if (!a_fi) {
477 ret = -EINVAL;
478 goto out;
479 }
480
481 list_for_each_entry(f, &cfg->func_list, list) {
482 if (f->fi == fi) {
483 ret = -EEXIST;
484 goto out;
485 }
486 }
487
488 f = usb_get_function(fi);
489 if (IS_ERR(f)) {
490 ret = PTR_ERR(f);
491 goto out;
492 }
493
494 /* stash the function until we bind it to the gadget */
495 list_add_tail(&f->list, &cfg->func_list);
496 ret = 0;
497 out:
498 mutex_unlock(&gi->lock);
499 return ret;
500 }
501
config_usb_cfg_unlink(struct config_item * usb_cfg_ci,struct config_item * usb_func_ci)502 static void config_usb_cfg_unlink(
503 struct config_item *usb_cfg_ci,
504 struct config_item *usb_func_ci)
505 {
506 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
507 struct gadget_info *gi = cfg_to_gadget_info(cfg);
508
509 struct usb_function_instance *fi =
510 to_usb_function_instance(usb_func_ci);
511 struct usb_function *f;
512
513 /*
514 * ideally I would like to forbid to unlink functions while a gadget is
515 * bound to an UDC. Since this isn't possible at the moment, we simply
516 * force an unbind, the function is available here and then we can
517 * remove the function.
518 */
519 mutex_lock(&gi->lock);
520 if (gi->composite.gadget_driver.udc_name)
521 unregister_gadget(gi);
522 WARN_ON(gi->composite.gadget_driver.udc_name);
523
524 list_for_each_entry(f, &cfg->func_list, list) {
525 if (f->fi == fi) {
526 list_del(&f->list);
527 usb_put_function(f);
528 mutex_unlock(&gi->lock);
529 return;
530 }
531 }
532 mutex_unlock(&gi->lock);
533 WARN(1, "Unable to locate function to unbind\n");
534 }
535
536 static struct configfs_item_operations gadget_config_item_ops = {
537 .release = gadget_config_attr_release,
538 .allow_link = config_usb_cfg_link,
539 .drop_link = config_usb_cfg_unlink,
540 };
541
542
gadget_config_desc_MaxPower_show(struct config_item * item,char * page)543 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
544 char *page)
545 {
546 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
547
548 return sprintf(page, "%u\n", cfg->c.MaxPower);
549 }
550
gadget_config_desc_MaxPower_store(struct config_item * item,const char * page,size_t len)551 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
552 const char *page, size_t len)
553 {
554 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
555 u16 val;
556 int ret;
557 ret = kstrtou16(page, 0, &val);
558 if (ret)
559 return ret;
560 if (DIV_ROUND_UP(val, 8) > 0xff)
561 return -ERANGE;
562 cfg->c.MaxPower = val;
563 return len;
564 }
565
gadget_config_desc_bmAttributes_show(struct config_item * item,char * page)566 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
567 char *page)
568 {
569 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
570
571 return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
572 }
573
gadget_config_desc_bmAttributes_store(struct config_item * item,const char * page,size_t len)574 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
575 const char *page, size_t len)
576 {
577 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
578 u8 val;
579 int ret;
580 ret = kstrtou8(page, 0, &val);
581 if (ret)
582 return ret;
583 if (!(val & USB_CONFIG_ATT_ONE))
584 return -EINVAL;
585 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
586 USB_CONFIG_ATT_WAKEUP))
587 return -EINVAL;
588 cfg->c.bmAttributes = val;
589 return len;
590 }
591
592 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
593 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
594
595 static struct configfs_attribute *gadget_config_attrs[] = {
596 &gadget_config_desc_attr_MaxPower,
597 &gadget_config_desc_attr_bmAttributes,
598 NULL,
599 };
600
601 static const struct config_item_type gadget_config_type = {
602 .ct_item_ops = &gadget_config_item_ops,
603 .ct_attrs = gadget_config_attrs,
604 .ct_owner = THIS_MODULE,
605 };
606
607 static const struct config_item_type gadget_root_type = {
608 .ct_item_ops = &gadget_root_item_ops,
609 .ct_attrs = gadget_root_attrs,
610 .ct_owner = THIS_MODULE,
611 };
612
composite_init_dev(struct usb_composite_dev * cdev)613 static void composite_init_dev(struct usb_composite_dev *cdev)
614 {
615 spin_lock_init(&cdev->lock);
616 INIT_LIST_HEAD(&cdev->configs);
617 INIT_LIST_HEAD(&cdev->gstrings);
618 }
619
function_make(struct config_group * group,const char * name)620 static struct config_group *function_make(
621 struct config_group *group,
622 const char *name)
623 {
624 struct gadget_info *gi;
625 struct usb_function_instance *fi;
626 char buf[MAX_NAME_LEN];
627 char *func_name;
628 char *instance_name;
629 int ret;
630
631 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
632 if (ret >= MAX_NAME_LEN)
633 return ERR_PTR(-ENAMETOOLONG);
634
635 func_name = buf;
636 instance_name = strchr(func_name, '.');
637 if (!instance_name) {
638 pr_err("Unable to locate . in FUNC.INSTANCE\n");
639 return ERR_PTR(-EINVAL);
640 }
641 *instance_name = '\0';
642 instance_name++;
643
644 fi = usb_get_function_instance(func_name);
645 if (IS_ERR(fi))
646 return ERR_CAST(fi);
647
648 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
649 if (ret) {
650 usb_put_function_instance(fi);
651 return ERR_PTR(ret);
652 }
653 if (fi->set_inst_name) {
654 ret = fi->set_inst_name(fi, instance_name);
655 if (ret) {
656 usb_put_function_instance(fi);
657 return ERR_PTR(ret);
658 }
659 }
660
661 gi = container_of(group, struct gadget_info, functions_group);
662
663 mutex_lock(&gi->lock);
664 list_add_tail(&fi->cfs_list, &gi->available_func);
665 mutex_unlock(&gi->lock);
666 return &fi->group;
667 }
668
function_drop(struct config_group * group,struct config_item * item)669 static void function_drop(
670 struct config_group *group,
671 struct config_item *item)
672 {
673 struct usb_function_instance *fi = to_usb_function_instance(item);
674 struct gadget_info *gi;
675
676 gi = container_of(group, struct gadget_info, functions_group);
677
678 mutex_lock(&gi->lock);
679 list_del(&fi->cfs_list);
680 mutex_unlock(&gi->lock);
681 config_item_put(item);
682 }
683
684 static struct configfs_group_operations functions_ops = {
685 .make_group = &function_make,
686 .drop_item = &function_drop,
687 };
688
689 static const struct config_item_type functions_type = {
690 .ct_group_ops = &functions_ops,
691 .ct_owner = THIS_MODULE,
692 };
693
694 GS_STRINGS_RW(gadget_config_name, configuration);
695
696 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
697 &gadget_config_name_attr_configuration,
698 NULL,
699 };
700
gadget_config_name_attr_release(struct config_item * item)701 static void gadget_config_name_attr_release(struct config_item *item)
702 {
703 struct gadget_config_name *cn = to_gadget_config_name(item);
704
705 kfree(cn->configuration);
706
707 list_del(&cn->list);
708 kfree(cn);
709 }
710
711 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
712 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
713
config_desc_make(struct config_group * group,const char * name)714 static struct config_group *config_desc_make(
715 struct config_group *group,
716 const char *name)
717 {
718 struct gadget_info *gi;
719 struct config_usb_cfg *cfg;
720 char buf[MAX_NAME_LEN];
721 char *num_str;
722 u8 num;
723 int ret;
724
725 gi = container_of(group, struct gadget_info, configs_group);
726 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
727 if (ret >= MAX_NAME_LEN)
728 return ERR_PTR(-ENAMETOOLONG);
729
730 num_str = strchr(buf, '.');
731 if (!num_str) {
732 pr_err("Unable to locate . in name.bConfigurationValue\n");
733 return ERR_PTR(-EINVAL);
734 }
735
736 *num_str = '\0';
737 num_str++;
738
739 if (!strlen(buf))
740 return ERR_PTR(-EINVAL);
741
742 ret = kstrtou8(num_str, 0, &num);
743 if (ret)
744 return ERR_PTR(ret);
745
746 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
747 if (!cfg)
748 return ERR_PTR(-ENOMEM);
749 cfg->c.label = kstrdup(buf, GFP_KERNEL);
750 if (!cfg->c.label) {
751 ret = -ENOMEM;
752 goto err;
753 }
754 cfg->c.bConfigurationValue = num;
755 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
756 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
757 INIT_LIST_HEAD(&cfg->string_list);
758 INIT_LIST_HEAD(&cfg->func_list);
759
760 config_group_init_type_name(&cfg->group, name,
761 &gadget_config_type);
762
763 config_group_init_type_name(&cfg->strings_group, "strings",
764 &gadget_config_name_strings_type);
765 configfs_add_default_group(&cfg->strings_group, &cfg->group);
766
767 ret = usb_add_config_only(&gi->cdev, &cfg->c);
768 if (ret)
769 goto err;
770
771 return &cfg->group;
772 err:
773 kfree(cfg->c.label);
774 kfree(cfg);
775 return ERR_PTR(ret);
776 }
777
config_desc_drop(struct config_group * group,struct config_item * item)778 static void config_desc_drop(
779 struct config_group *group,
780 struct config_item *item)
781 {
782 config_item_put(item);
783 }
784
785 static struct configfs_group_operations config_desc_ops = {
786 .make_group = &config_desc_make,
787 .drop_item = &config_desc_drop,
788 };
789
790 static const struct config_item_type config_desc_type = {
791 .ct_group_ops = &config_desc_ops,
792 .ct_owner = THIS_MODULE,
793 };
794
795 GS_STRINGS_RW(gadget_strings, manufacturer);
796 GS_STRINGS_RW(gadget_strings, product);
797 GS_STRINGS_RW(gadget_strings, serialnumber);
798
799 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
800 &gadget_strings_attr_manufacturer,
801 &gadget_strings_attr_product,
802 &gadget_strings_attr_serialnumber,
803 NULL,
804 };
805
gadget_strings_attr_release(struct config_item * item)806 static void gadget_strings_attr_release(struct config_item *item)
807 {
808 struct gadget_strings *gs = to_gadget_strings(item);
809
810 kfree(gs->manufacturer);
811 kfree(gs->product);
812 kfree(gs->serialnumber);
813
814 list_del(&gs->list);
815 kfree(gs);
816 }
817
818 USB_CONFIG_STRING_RW_OPS(gadget_strings);
819 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
820
os_desc_item_to_gadget_info(struct config_item * item)821 static inline struct gadget_info *os_desc_item_to_gadget_info(
822 struct config_item *item)
823 {
824 return container_of(to_config_group(item),
825 struct gadget_info, os_desc_group);
826 }
827
os_desc_use_show(struct config_item * item,char * page)828 static ssize_t os_desc_use_show(struct config_item *item, char *page)
829 {
830 return sprintf(page, "%d\n",
831 os_desc_item_to_gadget_info(item)->use_os_desc);
832 }
833
os_desc_use_store(struct config_item * item,const char * page,size_t len)834 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
835 size_t len)
836 {
837 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
838 int ret;
839 bool use;
840
841 mutex_lock(&gi->lock);
842 ret = strtobool(page, &use);
843 if (!ret) {
844 gi->use_os_desc = use;
845 ret = len;
846 }
847 mutex_unlock(&gi->lock);
848
849 return ret;
850 }
851
os_desc_b_vendor_code_show(struct config_item * item,char * page)852 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
853 {
854 return sprintf(page, "0x%02x\n",
855 os_desc_item_to_gadget_info(item)->b_vendor_code);
856 }
857
os_desc_b_vendor_code_store(struct config_item * item,const char * page,size_t len)858 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
859 const char *page, size_t len)
860 {
861 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
862 int ret;
863 u8 b_vendor_code;
864
865 mutex_lock(&gi->lock);
866 ret = kstrtou8(page, 0, &b_vendor_code);
867 if (!ret) {
868 gi->b_vendor_code = b_vendor_code;
869 ret = len;
870 }
871 mutex_unlock(&gi->lock);
872
873 return ret;
874 }
875
os_desc_qw_sign_show(struct config_item * item,char * page)876 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
877 {
878 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
879 int res;
880
881 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
882 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
883 page[res++] = '\n';
884
885 return res;
886 }
887
os_desc_qw_sign_store(struct config_item * item,const char * page,size_t len)888 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
889 size_t len)
890 {
891 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
892 int res, l;
893
894 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
895 if (page[l - 1] == '\n')
896 --l;
897
898 mutex_lock(&gi->lock);
899 res = utf8s_to_utf16s(page, l,
900 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
901 OS_STRING_QW_SIGN_LEN);
902 if (res > 0)
903 res = len;
904 mutex_unlock(&gi->lock);
905
906 return res;
907 }
908
909 CONFIGFS_ATTR(os_desc_, use);
910 CONFIGFS_ATTR(os_desc_, b_vendor_code);
911 CONFIGFS_ATTR(os_desc_, qw_sign);
912
913 static struct configfs_attribute *os_desc_attrs[] = {
914 &os_desc_attr_use,
915 &os_desc_attr_b_vendor_code,
916 &os_desc_attr_qw_sign,
917 NULL,
918 };
919
os_desc_link(struct config_item * os_desc_ci,struct config_item * usb_cfg_ci)920 static int os_desc_link(struct config_item *os_desc_ci,
921 struct config_item *usb_cfg_ci)
922 {
923 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
924 struct usb_composite_dev *cdev = &gi->cdev;
925 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci);
926 struct usb_configuration *c = NULL, *iter;
927 int ret;
928
929 mutex_lock(&gi->lock);
930 list_for_each_entry(iter, &cdev->configs, list) {
931 if (iter != &c_target->c)
932 continue;
933 c = iter;
934 break;
935 }
936 if (!c) {
937 ret = -EINVAL;
938 goto out;
939 }
940
941 if (cdev->os_desc_config) {
942 ret = -EBUSY;
943 goto out;
944 }
945
946 cdev->os_desc_config = &c_target->c;
947 ret = 0;
948
949 out:
950 mutex_unlock(&gi->lock);
951 return ret;
952 }
953
os_desc_unlink(struct config_item * os_desc_ci,struct config_item * usb_cfg_ci)954 static void os_desc_unlink(struct config_item *os_desc_ci,
955 struct config_item *usb_cfg_ci)
956 {
957 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
958 struct usb_composite_dev *cdev = &gi->cdev;
959
960 mutex_lock(&gi->lock);
961 if (gi->composite.gadget_driver.udc_name)
962 unregister_gadget(gi);
963 cdev->os_desc_config = NULL;
964 WARN_ON(gi->composite.gadget_driver.udc_name);
965 mutex_unlock(&gi->lock);
966 }
967
968 static struct configfs_item_operations os_desc_ops = {
969 .allow_link = os_desc_link,
970 .drop_link = os_desc_unlink,
971 };
972
973 static struct config_item_type os_desc_type = {
974 .ct_item_ops = &os_desc_ops,
975 .ct_attrs = os_desc_attrs,
976 .ct_owner = THIS_MODULE,
977 };
978
979 static inline struct usb_os_desc_ext_prop
to_usb_os_desc_ext_prop(struct config_item * item)980 *to_usb_os_desc_ext_prop(struct config_item *item)
981 {
982 return container_of(item, struct usb_os_desc_ext_prop, item);
983 }
984
ext_prop_type_show(struct config_item * item,char * page)985 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
986 {
987 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
988 }
989
ext_prop_type_store(struct config_item * item,const char * page,size_t len)990 static ssize_t ext_prop_type_store(struct config_item *item,
991 const char *page, size_t len)
992 {
993 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
994 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
995 u8 type;
996 int ret;
997
998 if (desc->opts_mutex)
999 mutex_lock(desc->opts_mutex);
1000 ret = kstrtou8(page, 0, &type);
1001 if (ret)
1002 goto end;
1003 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
1004 ret = -EINVAL;
1005 goto end;
1006 }
1007
1008 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
1009 ext_prop->type == USB_EXT_PROP_LE32 ||
1010 ext_prop->type == USB_EXT_PROP_BE32) &&
1011 (type == USB_EXT_PROP_UNICODE ||
1012 type == USB_EXT_PROP_UNICODE_ENV ||
1013 type == USB_EXT_PROP_UNICODE_LINK))
1014 ext_prop->data_len <<= 1;
1015 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
1016 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1017 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
1018 (type == USB_EXT_PROP_BINARY ||
1019 type == USB_EXT_PROP_LE32 ||
1020 type == USB_EXT_PROP_BE32))
1021 ext_prop->data_len >>= 1;
1022 ext_prop->type = type;
1023 ret = len;
1024
1025 end:
1026 if (desc->opts_mutex)
1027 mutex_unlock(desc->opts_mutex);
1028 return ret;
1029 }
1030
ext_prop_data_show(struct config_item * item,char * page)1031 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
1032 {
1033 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1034 int len = ext_prop->data_len;
1035
1036 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1037 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1038 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1039 len >>= 1;
1040 memcpy(page, ext_prop->data, len);
1041
1042 return len;
1043 }
1044
ext_prop_data_store(struct config_item * item,const char * page,size_t len)1045 static ssize_t ext_prop_data_store(struct config_item *item,
1046 const char *page, size_t len)
1047 {
1048 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1049 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1050 char *new_data;
1051 size_t ret_len = len;
1052
1053 if (page[len - 1] == '\n' || page[len - 1] == '\0')
1054 --len;
1055 new_data = kmemdup(page, len, GFP_KERNEL);
1056 if (!new_data)
1057 return -ENOMEM;
1058
1059 if (desc->opts_mutex)
1060 mutex_lock(desc->opts_mutex);
1061 kfree(ext_prop->data);
1062 ext_prop->data = new_data;
1063 desc->ext_prop_len -= ext_prop->data_len;
1064 ext_prop->data_len = len;
1065 desc->ext_prop_len += ext_prop->data_len;
1066 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1067 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1068 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1069 desc->ext_prop_len -= ext_prop->data_len;
1070 ext_prop->data_len <<= 1;
1071 ext_prop->data_len += 2;
1072 desc->ext_prop_len += ext_prop->data_len;
1073 }
1074 if (desc->opts_mutex)
1075 mutex_unlock(desc->opts_mutex);
1076 return ret_len;
1077 }
1078
1079 CONFIGFS_ATTR(ext_prop_, type);
1080 CONFIGFS_ATTR(ext_prop_, data);
1081
1082 static struct configfs_attribute *ext_prop_attrs[] = {
1083 &ext_prop_attr_type,
1084 &ext_prop_attr_data,
1085 NULL,
1086 };
1087
usb_os_desc_ext_prop_release(struct config_item * item)1088 static void usb_os_desc_ext_prop_release(struct config_item *item)
1089 {
1090 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1091
1092 kfree(ext_prop); /* frees a whole chunk */
1093 }
1094
1095 static struct configfs_item_operations ext_prop_ops = {
1096 .release = usb_os_desc_ext_prop_release,
1097 };
1098
ext_prop_make(struct config_group * group,const char * name)1099 static struct config_item *ext_prop_make(
1100 struct config_group *group,
1101 const char *name)
1102 {
1103 struct usb_os_desc_ext_prop *ext_prop;
1104 struct config_item_type *ext_prop_type;
1105 struct usb_os_desc *desc;
1106 char *vlabuf;
1107
1108 vla_group(data_chunk);
1109 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1110 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1111
1112 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1113 if (!vlabuf)
1114 return ERR_PTR(-ENOMEM);
1115
1116 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1117 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1118
1119 desc = container_of(group, struct usb_os_desc, group);
1120 ext_prop_type->ct_item_ops = &ext_prop_ops;
1121 ext_prop_type->ct_attrs = ext_prop_attrs;
1122 ext_prop_type->ct_owner = desc->owner;
1123
1124 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1125
1126 ext_prop->name = kstrdup(name, GFP_KERNEL);
1127 if (!ext_prop->name) {
1128 kfree(vlabuf);
1129 return ERR_PTR(-ENOMEM);
1130 }
1131 desc->ext_prop_len += 14;
1132 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1133 if (desc->opts_mutex)
1134 mutex_lock(desc->opts_mutex);
1135 desc->ext_prop_len += ext_prop->name_len;
1136 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1137 ++desc->ext_prop_count;
1138 if (desc->opts_mutex)
1139 mutex_unlock(desc->opts_mutex);
1140
1141 return &ext_prop->item;
1142 }
1143
ext_prop_drop(struct config_group * group,struct config_item * item)1144 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1145 {
1146 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1147 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1148
1149 if (desc->opts_mutex)
1150 mutex_lock(desc->opts_mutex);
1151 list_del(&ext_prop->entry);
1152 --desc->ext_prop_count;
1153 kfree(ext_prop->name);
1154 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1155 if (desc->opts_mutex)
1156 mutex_unlock(desc->opts_mutex);
1157 config_item_put(item);
1158 }
1159
1160 static struct configfs_group_operations interf_grp_ops = {
1161 .make_item = &ext_prop_make,
1162 .drop_item = &ext_prop_drop,
1163 };
1164
interf_grp_compatible_id_show(struct config_item * item,char * page)1165 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1166 char *page)
1167 {
1168 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1169 return 8;
1170 }
1171
interf_grp_compatible_id_store(struct config_item * item,const char * page,size_t len)1172 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1173 const char *page, size_t len)
1174 {
1175 struct usb_os_desc *desc = to_usb_os_desc(item);
1176 int l;
1177
1178 l = min_t(int, 8, len);
1179 if (page[l - 1] == '\n')
1180 --l;
1181 if (desc->opts_mutex)
1182 mutex_lock(desc->opts_mutex);
1183 memcpy(desc->ext_compat_id, page, l);
1184
1185 if (desc->opts_mutex)
1186 mutex_unlock(desc->opts_mutex);
1187
1188 return len;
1189 }
1190
interf_grp_sub_compatible_id_show(struct config_item * item,char * page)1191 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1192 char *page)
1193 {
1194 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1195 return 8;
1196 }
1197
interf_grp_sub_compatible_id_store(struct config_item * item,const char * page,size_t len)1198 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1199 const char *page, size_t len)
1200 {
1201 struct usb_os_desc *desc = to_usb_os_desc(item);
1202 int l;
1203
1204 l = min_t(int, 8, len);
1205 if (page[l - 1] == '\n')
1206 --l;
1207 if (desc->opts_mutex)
1208 mutex_lock(desc->opts_mutex);
1209 memcpy(desc->ext_compat_id + 8, page, l);
1210
1211 if (desc->opts_mutex)
1212 mutex_unlock(desc->opts_mutex);
1213
1214 return len;
1215 }
1216
1217 CONFIGFS_ATTR(interf_grp_, compatible_id);
1218 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1219
1220 static struct configfs_attribute *interf_grp_attrs[] = {
1221 &interf_grp_attr_compatible_id,
1222 &interf_grp_attr_sub_compatible_id,
1223 NULL
1224 };
1225
usb_os_desc_prepare_interf_dir(struct config_group * parent,int n_interf,struct usb_os_desc ** desc,char ** names,struct module * owner)1226 struct config_group *usb_os_desc_prepare_interf_dir(
1227 struct config_group *parent,
1228 int n_interf,
1229 struct usb_os_desc **desc,
1230 char **names,
1231 struct module *owner)
1232 {
1233 struct config_group *os_desc_group;
1234 struct config_item_type *os_desc_type, *interface_type;
1235
1236 vla_group(data_chunk);
1237 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1238 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1239 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1240
1241 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1242 if (!vlabuf)
1243 return ERR_PTR(-ENOMEM);
1244
1245 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1246 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1247 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1248
1249 os_desc_type->ct_owner = owner;
1250 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1251 configfs_add_default_group(os_desc_group, parent);
1252
1253 interface_type->ct_group_ops = &interf_grp_ops;
1254 interface_type->ct_attrs = interf_grp_attrs;
1255 interface_type->ct_owner = owner;
1256
1257 while (n_interf--) {
1258 struct usb_os_desc *d;
1259
1260 d = desc[n_interf];
1261 d->owner = owner;
1262 config_group_init_type_name(&d->group, "", interface_type);
1263 config_item_set_name(&d->group.cg_item, "interface.%s",
1264 names[n_interf]);
1265 configfs_add_default_group(&d->group, os_desc_group);
1266 }
1267
1268 return os_desc_group;
1269 }
1270 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1271
configfs_do_nothing(struct usb_composite_dev * cdev)1272 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1273 {
1274 WARN_ON(1);
1275 return -EINVAL;
1276 }
1277
1278 int composite_dev_prepare(struct usb_composite_driver *composite,
1279 struct usb_composite_dev *dev);
1280
1281 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1282 struct usb_ep *ep0);
1283
purge_configs_funcs(struct gadget_info * gi)1284 static void purge_configs_funcs(struct gadget_info *gi)
1285 {
1286 struct usb_configuration *c;
1287
1288 list_for_each_entry(c, &gi->cdev.configs, list) {
1289 struct usb_function *f, *tmp;
1290 struct config_usb_cfg *cfg;
1291
1292 cfg = container_of(c, struct config_usb_cfg, c);
1293
1294 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1295
1296 list_move(&f->list, &cfg->func_list);
1297 if (f->unbind) {
1298 dev_dbg(&gi->cdev.gadget->dev,
1299 "unbind function '%s'/%p\n",
1300 f->name, f);
1301 f->unbind(c, f);
1302 }
1303 }
1304 c->next_interface_id = 0;
1305 memset(c->interface, 0, sizeof(c->interface));
1306 c->superspeed_plus = 0;
1307 c->superspeed = 0;
1308 c->highspeed = 0;
1309 c->fullspeed = 0;
1310 }
1311 }
1312
configfs_composite_bind(struct usb_gadget * gadget,struct usb_gadget_driver * gdriver)1313 static int configfs_composite_bind(struct usb_gadget *gadget,
1314 struct usb_gadget_driver *gdriver)
1315 {
1316 struct usb_composite_driver *composite = to_cdriver(gdriver);
1317 struct gadget_info *gi = container_of(composite,
1318 struct gadget_info, composite);
1319 struct usb_composite_dev *cdev = &gi->cdev;
1320 struct usb_configuration *c;
1321 struct usb_string *s;
1322 unsigned i;
1323 int ret;
1324
1325 /* the gi->lock is hold by the caller */
1326 gi->unbind = 0;
1327 cdev->gadget = gadget;
1328 set_gadget_data(gadget, cdev);
1329 ret = composite_dev_prepare(composite, cdev);
1330 if (ret)
1331 return ret;
1332 /* and now the gadget bind */
1333 ret = -EINVAL;
1334
1335 if (list_empty(&gi->cdev.configs)) {
1336 pr_err("Need at least one configuration in %s.\n",
1337 gi->composite.name);
1338 goto err_comp_cleanup;
1339 }
1340
1341
1342 list_for_each_entry(c, &gi->cdev.configs, list) {
1343 struct config_usb_cfg *cfg;
1344
1345 cfg = container_of(c, struct config_usb_cfg, c);
1346 if (list_empty(&cfg->func_list)) {
1347 pr_err("Config %s/%d of %s needs at least one function.\n",
1348 c->label, c->bConfigurationValue,
1349 gi->composite.name);
1350 goto err_comp_cleanup;
1351 }
1352 }
1353
1354 /* init all strings */
1355 if (!list_empty(&gi->string_list)) {
1356 struct gadget_strings *gs;
1357
1358 i = 0;
1359 list_for_each_entry(gs, &gi->string_list, list) {
1360
1361 gi->gstrings[i] = &gs->stringtab_dev;
1362 gs->stringtab_dev.strings = gs->strings;
1363 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1364 gs->manufacturer;
1365 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1366 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1367 i++;
1368 }
1369 gi->gstrings[i] = NULL;
1370 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1371 USB_GADGET_FIRST_AVAIL_IDX);
1372 if (IS_ERR(s)) {
1373 ret = PTR_ERR(s);
1374 goto err_comp_cleanup;
1375 }
1376
1377 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1378 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1379 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1380 }
1381
1382 if (gi->use_os_desc) {
1383 cdev->use_os_string = true;
1384 cdev->b_vendor_code = gi->b_vendor_code;
1385 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1386 }
1387
1388 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1389 struct usb_descriptor_header *usb_desc;
1390
1391 usb_desc = usb_otg_descriptor_alloc(gadget);
1392 if (!usb_desc) {
1393 ret = -ENOMEM;
1394 goto err_comp_cleanup;
1395 }
1396 usb_otg_descriptor_init(gadget, usb_desc);
1397 otg_desc[0] = usb_desc;
1398 otg_desc[1] = NULL;
1399 }
1400
1401 /* Go through all configs, attach all functions */
1402 list_for_each_entry(c, &gi->cdev.configs, list) {
1403 struct config_usb_cfg *cfg;
1404 struct usb_function *f;
1405 struct usb_function *tmp;
1406 struct gadget_config_name *cn;
1407
1408 if (gadget_is_otg(gadget))
1409 c->descriptors = otg_desc;
1410
1411 cfg = container_of(c, struct config_usb_cfg, c);
1412 if (!list_empty(&cfg->string_list)) {
1413 i = 0;
1414 list_for_each_entry(cn, &cfg->string_list, list) {
1415 cfg->gstrings[i] = &cn->stringtab_dev;
1416 cn->stringtab_dev.strings = &cn->strings;
1417 cn->strings.s = cn->configuration;
1418 i++;
1419 }
1420 cfg->gstrings[i] = NULL;
1421 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1422 if (IS_ERR(s)) {
1423 ret = PTR_ERR(s);
1424 goto err_comp_cleanup;
1425 }
1426 c->iConfiguration = s[0].id;
1427 }
1428
1429 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1430 list_del(&f->list);
1431 ret = usb_add_function(c, f);
1432 if (ret) {
1433 list_add(&f->list, &cfg->func_list);
1434 goto err_purge_funcs;
1435 }
1436 }
1437 ret = usb_gadget_check_config(cdev->gadget);
1438 if (ret)
1439 goto err_purge_funcs;
1440
1441 usb_ep_autoconfig_reset(cdev->gadget);
1442 }
1443 if (cdev->use_os_string) {
1444 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1445 if (ret)
1446 goto err_purge_funcs;
1447 }
1448
1449 usb_ep_autoconfig_reset(cdev->gadget);
1450 return 0;
1451
1452 err_purge_funcs:
1453 purge_configs_funcs(gi);
1454 err_comp_cleanup:
1455 composite_dev_cleanup(cdev);
1456 return ret;
1457 }
1458
1459 #ifdef CONFIG_USB_CONFIGFS_UEVENT
android_work(struct work_struct * data)1460 static void android_work(struct work_struct *data)
1461 {
1462 struct gadget_info *gi = container_of(data, struct gadget_info, work);
1463 struct usb_composite_dev *cdev = &gi->cdev;
1464 char *disconnected[2] = { "USB_STATE=DISCONNECTED", NULL };
1465 char *connected[2] = { "USB_STATE=CONNECTED", NULL };
1466 char *configured[2] = { "USB_STATE=CONFIGURED", NULL };
1467 /* 0-connected 1-configured 2-disconnected*/
1468 bool status[3] = { false, false, false };
1469 unsigned long flags;
1470 bool uevent_sent = false;
1471
1472 spin_lock_irqsave(&cdev->lock, flags);
1473 if (cdev->config)
1474 status[1] = true;
1475
1476 if (gi->connected != gi->sw_connected) {
1477 if (gi->connected)
1478 status[0] = true;
1479 else
1480 status[2] = true;
1481 gi->sw_connected = gi->connected;
1482 }
1483 spin_unlock_irqrestore(&cdev->lock, flags);
1484
1485 if (status[0]) {
1486 kobject_uevent_env(&gi->dev->kobj, KOBJ_CHANGE, connected);
1487 pr_info("%s: sent uevent %s\n", __func__, connected[0]);
1488 uevent_sent = true;
1489 }
1490
1491 if (status[1]) {
1492 kobject_uevent_env(&gi->dev->kobj, KOBJ_CHANGE, configured);
1493 pr_info("%s: sent uevent %s\n", __func__, configured[0]);
1494 uevent_sent = true;
1495 }
1496
1497 if (status[2]) {
1498 kobject_uevent_env(&gi->dev->kobj, KOBJ_CHANGE, disconnected);
1499 pr_info("%s: sent uevent %s\n", __func__, disconnected[0]);
1500 uevent_sent = true;
1501 }
1502
1503 if (!uevent_sent) {
1504 pr_info("%s: did not send uevent (%d %d %p)\n", __func__,
1505 gi->connected, gi->sw_connected, cdev->config);
1506 }
1507 }
1508 #endif
1509
configfs_composite_unbind(struct usb_gadget * gadget)1510 static void configfs_composite_unbind(struct usb_gadget *gadget)
1511 {
1512 struct usb_composite_dev *cdev;
1513 struct gadget_info *gi;
1514 unsigned long flags;
1515
1516 /* the gi->lock is hold by the caller */
1517
1518 cdev = get_gadget_data(gadget);
1519 gi = container_of(cdev, struct gadget_info, cdev);
1520 spin_lock_irqsave(&gi->spinlock, flags);
1521 gi->unbind = 1;
1522 spin_unlock_irqrestore(&gi->spinlock, flags);
1523
1524 kfree(otg_desc[0]);
1525 otg_desc[0] = NULL;
1526 purge_configs_funcs(gi);
1527 composite_dev_cleanup(cdev);
1528 usb_ep_autoconfig_reset(cdev->gadget);
1529 spin_lock_irqsave(&gi->spinlock, flags);
1530 cdev->gadget = NULL;
1531 cdev->deactivations = 0;
1532 gadget->deactivated = false;
1533 set_gadget_data(gadget, NULL);
1534 spin_unlock_irqrestore(&gi->spinlock, flags);
1535 }
1536
1537 #ifdef CONFIG_USB_CONFIGFS_UEVENT
android_setup(struct usb_gadget * gadget,const struct usb_ctrlrequest * c)1538 static int android_setup(struct usb_gadget *gadget,
1539 const struct usb_ctrlrequest *c)
1540 {
1541 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1542 unsigned long flags;
1543 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
1544 int value = -EOPNOTSUPP;
1545 struct usb_function_instance *fi;
1546
1547 spin_lock_irqsave(&cdev->lock, flags);
1548 if (!gi->connected) {
1549 gi->connected = 1;
1550 schedule_work(&gi->work);
1551 }
1552 spin_unlock_irqrestore(&cdev->lock, flags);
1553 list_for_each_entry(fi, &gi->available_func, cfs_list) {
1554 if (fi != NULL && fi->f != NULL && fi->f->setup != NULL) {
1555 value = fi->f->setup(fi->f, c);
1556 if (value >= 0)
1557 break;
1558 }
1559 }
1560
1561 #ifdef CONFIG_USB_CONFIGFS_F_ACC
1562 if (value < 0)
1563 value = acc_ctrlrequest_composite(cdev, c);
1564 #endif
1565
1566 if (value < 0) {
1567 spin_lock_irqsave(&gi->spinlock, flags);
1568 value = composite_setup(gadget, c);
1569 spin_unlock_irqrestore(&gi->spinlock, flags);
1570 }
1571
1572 spin_lock_irqsave(&cdev->lock, flags);
1573 if (c->bRequest == USB_REQ_SET_CONFIGURATION &&
1574 cdev->config) {
1575 schedule_work(&gi->work);
1576 }
1577 spin_unlock_irqrestore(&cdev->lock, flags);
1578
1579 return value;
1580 }
1581
1582 #else // CONFIG_USB_CONFIGFS_UEVENT
1583
configfs_composite_setup(struct usb_gadget * gadget,const struct usb_ctrlrequest * ctrl)1584 static int configfs_composite_setup(struct usb_gadget *gadget,
1585 const struct usb_ctrlrequest *ctrl)
1586 {
1587 struct usb_composite_dev *cdev;
1588 struct gadget_info *gi;
1589 unsigned long flags;
1590 int ret;
1591
1592 cdev = get_gadget_data(gadget);
1593 if (!cdev)
1594 return 0;
1595
1596 gi = container_of(cdev, struct gadget_info, cdev);
1597 spin_lock_irqsave(&gi->spinlock, flags);
1598 cdev = get_gadget_data(gadget);
1599 if (!cdev || gi->unbind) {
1600 spin_unlock_irqrestore(&gi->spinlock, flags);
1601 return 0;
1602 }
1603
1604 ret = composite_setup(gadget, ctrl);
1605 spin_unlock_irqrestore(&gi->spinlock, flags);
1606 return ret;
1607 }
1608
1609 #endif // CONFIG_USB_CONFIGFS_UEVENT
1610
configfs_composite_disconnect(struct usb_gadget * gadget)1611 static void configfs_composite_disconnect(struct usb_gadget *gadget)
1612 {
1613 struct usb_composite_dev *cdev;
1614 struct gadget_info *gi;
1615 unsigned long flags;
1616
1617 cdev = get_gadget_data(gadget);
1618 if (!cdev)
1619 return;
1620
1621 #ifdef CONFIG_USB_CONFIGFS_F_ACC
1622 /*
1623 * accessory HID support can be active while the
1624 * accessory function is not actually enabled,
1625 * so we need to inform it when we are disconnected.
1626 */
1627 acc_disconnect();
1628 #endif
1629 gi = container_of(cdev, struct gadget_info, cdev);
1630 spin_lock_irqsave(&gi->spinlock, flags);
1631 cdev = get_gadget_data(gadget);
1632 if (!cdev || gi->unbind) {
1633 spin_unlock_irqrestore(&gi->spinlock, flags);
1634 return;
1635 }
1636
1637 #ifdef CONFIG_USB_CONFIGFS_UEVENT
1638 gi->connected = 0;
1639 schedule_work(&gi->work);
1640 #endif
1641 composite_disconnect(gadget);
1642 spin_unlock_irqrestore(&gi->spinlock, flags);
1643 }
1644
configfs_composite_reset(struct usb_gadget * gadget)1645 static void configfs_composite_reset(struct usb_gadget *gadget)
1646 {
1647 struct usb_composite_dev *cdev;
1648 struct gadget_info *gi;
1649 unsigned long flags;
1650
1651 cdev = get_gadget_data(gadget);
1652 if (!cdev)
1653 return;
1654
1655 gi = container_of(cdev, struct gadget_info, cdev);
1656 spin_lock_irqsave(&gi->spinlock, flags);
1657 cdev = get_gadget_data(gadget);
1658 if (!cdev || gi->unbind) {
1659 spin_unlock_irqrestore(&gi->spinlock, flags);
1660 return;
1661 }
1662
1663 composite_reset(gadget);
1664 spin_unlock_irqrestore(&gi->spinlock, flags);
1665 }
1666
configfs_composite_suspend(struct usb_gadget * gadget)1667 static void configfs_composite_suspend(struct usb_gadget *gadget)
1668 {
1669 struct usb_composite_dev *cdev;
1670 struct gadget_info *gi;
1671 unsigned long flags;
1672
1673 cdev = get_gadget_data(gadget);
1674 if (!cdev)
1675 return;
1676
1677 gi = container_of(cdev, struct gadget_info, cdev);
1678 spin_lock_irqsave(&gi->spinlock, flags);
1679 cdev = get_gadget_data(gadget);
1680 if (!cdev || gi->unbind) {
1681 spin_unlock_irqrestore(&gi->spinlock, flags);
1682 return;
1683 }
1684
1685 composite_suspend(gadget);
1686 spin_unlock_irqrestore(&gi->spinlock, flags);
1687 }
1688
configfs_composite_resume(struct usb_gadget * gadget)1689 static void configfs_composite_resume(struct usb_gadget *gadget)
1690 {
1691 struct usb_composite_dev *cdev;
1692 struct gadget_info *gi;
1693 unsigned long flags;
1694
1695 cdev = get_gadget_data(gadget);
1696 if (!cdev)
1697 return;
1698
1699 gi = container_of(cdev, struct gadget_info, cdev);
1700 spin_lock_irqsave(&gi->spinlock, flags);
1701 cdev = get_gadget_data(gadget);
1702 if (!cdev || gi->unbind) {
1703 spin_unlock_irqrestore(&gi->spinlock, flags);
1704 return;
1705 }
1706
1707 composite_resume(gadget);
1708 spin_unlock_irqrestore(&gi->spinlock, flags);
1709 }
1710
1711 static const struct usb_gadget_driver configfs_driver_template = {
1712 .bind = configfs_composite_bind,
1713 .unbind = configfs_composite_unbind,
1714
1715 #ifdef CONFIG_USB_CONFIGFS_UEVENT
1716 .setup = android_setup,
1717 #else
1718 .setup = configfs_composite_setup,
1719 #endif
1720 .reset = configfs_composite_reset,
1721 .disconnect = configfs_composite_disconnect,
1722 .suspend = configfs_composite_suspend,
1723 .resume = configfs_composite_resume,
1724
1725 .max_speed = USB_SPEED_SUPER_PLUS,
1726 .driver = {
1727 .owner = THIS_MODULE,
1728 },
1729 .match_existing_only = 1,
1730 };
1731
1732 #ifdef CONFIG_USB_CONFIGFS_UEVENT
state_show(struct device * pdev,struct device_attribute * attr,char * buf)1733 static ssize_t state_show(struct device *pdev, struct device_attribute *attr,
1734 char *buf)
1735 {
1736 struct gadget_info *dev = dev_get_drvdata(pdev);
1737 struct usb_composite_dev *cdev;
1738 char *state = "DISCONNECTED";
1739 unsigned long flags;
1740
1741 if (!dev)
1742 goto out;
1743
1744 cdev = &dev->cdev;
1745
1746 if (!cdev)
1747 goto out;
1748
1749 spin_lock_irqsave(&cdev->lock, flags);
1750 if (cdev->config)
1751 state = "CONFIGURED";
1752 else if (dev->connected)
1753 state = "CONNECTED";
1754 spin_unlock_irqrestore(&cdev->lock, flags);
1755 out:
1756 return sprintf(buf, "%s\n", state);
1757 }
1758
1759 static DEVICE_ATTR(state, S_IRUGO, state_show, NULL);
1760
1761 static struct device_attribute *android_usb_attributes[] = {
1762 &dev_attr_state,
1763 NULL
1764 };
1765
android_device_create(struct gadget_info * gi)1766 static int android_device_create(struct gadget_info *gi)
1767 {
1768 struct device_attribute **attrs;
1769 struct device_attribute *attr;
1770
1771 INIT_WORK(&gi->work, android_work);
1772 gi->dev = device_create(android_class, NULL,
1773 MKDEV(0, 0), NULL, "android%d", gadget_index++);
1774 if (IS_ERR(gi->dev))
1775 return PTR_ERR(gi->dev);
1776
1777 dev_set_drvdata(gi->dev, gi);
1778 if (!android_device)
1779 android_device = gi->dev;
1780
1781 attrs = android_usb_attributes;
1782 while ((attr = *attrs++)) {
1783 int err;
1784
1785 err = device_create_file(gi->dev, attr);
1786 if (err) {
1787 device_destroy(gi->dev->class,
1788 gi->dev->devt);
1789 return err;
1790 }
1791 }
1792
1793 return 0;
1794 }
1795
android_device_destroy(struct gadget_info * gi)1796 static void android_device_destroy(struct gadget_info *gi)
1797 {
1798 struct device_attribute **attrs;
1799 struct device_attribute *attr;
1800
1801 attrs = android_usb_attributes;
1802 while ((attr = *attrs++))
1803 device_remove_file(gi->dev, attr);
1804 device_destroy(gi->dev->class, gi->dev->devt);
1805 }
1806 #else
android_device_create(struct gadget_info * gi)1807 static inline int android_device_create(struct gadget_info *gi)
1808 {
1809 return 0;
1810 }
1811
android_device_destroy(struct gadget_info * gi)1812 static inline void android_device_destroy(struct gadget_info *gi)
1813 {
1814 }
1815 #endif
1816
gadgets_make(struct config_group * group,const char * name)1817 static struct config_group *gadgets_make(
1818 struct config_group *group,
1819 const char *name)
1820 {
1821 struct gadget_info *gi;
1822
1823 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1824 if (!gi)
1825 return ERR_PTR(-ENOMEM);
1826
1827 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1828
1829 config_group_init_type_name(&gi->functions_group, "functions",
1830 &functions_type);
1831 configfs_add_default_group(&gi->functions_group, &gi->group);
1832
1833 config_group_init_type_name(&gi->configs_group, "configs",
1834 &config_desc_type);
1835 configfs_add_default_group(&gi->configs_group, &gi->group);
1836
1837 config_group_init_type_name(&gi->strings_group, "strings",
1838 &gadget_strings_strings_type);
1839 configfs_add_default_group(&gi->strings_group, &gi->group);
1840
1841 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1842 &os_desc_type);
1843 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1844
1845 gi->composite.bind = configfs_do_nothing;
1846 gi->composite.unbind = configfs_do_nothing;
1847 gi->composite.suspend = NULL;
1848 gi->composite.resume = NULL;
1849 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
1850
1851 spin_lock_init(&gi->spinlock);
1852 mutex_init(&gi->lock);
1853 INIT_LIST_HEAD(&gi->string_list);
1854 INIT_LIST_HEAD(&gi->available_func);
1855
1856 composite_init_dev(&gi->cdev);
1857 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1858 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1859 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1860
1861 gi->composite.gadget_driver = configfs_driver_template;
1862
1863 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL,
1864 "configfs-gadget.%s", name);
1865 if (!gi->composite.gadget_driver.driver.name)
1866 goto err;
1867
1868 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1869 gi->composite.name = gi->composite.gadget_driver.function;
1870
1871 if (!gi->composite.gadget_driver.function)
1872 goto out_free_driver_name;
1873
1874 if (android_device_create(gi) < 0)
1875 goto out_free_driver_name;
1876
1877 return &gi->group;
1878
1879 out_free_driver_name:
1880 kfree(gi->composite.gadget_driver.driver.name);
1881 err:
1882 kfree(gi);
1883 return ERR_PTR(-ENOMEM);
1884 }
1885
gadgets_drop(struct config_group * group,struct config_item * item)1886 static void gadgets_drop(struct config_group *group, struct config_item *item)
1887 {
1888 struct gadget_info *gi;
1889
1890 gi = container_of(to_config_group(item), struct gadget_info, group);
1891 config_item_put(item);
1892 android_device_destroy(gi);
1893 }
1894
1895 static struct configfs_group_operations gadgets_ops = {
1896 .make_group = &gadgets_make,
1897 .drop_item = &gadgets_drop,
1898 };
1899
1900 static const struct config_item_type gadgets_type = {
1901 .ct_group_ops = &gadgets_ops,
1902 .ct_owner = THIS_MODULE,
1903 };
1904
1905 static struct configfs_subsystem gadget_subsys = {
1906 .su_group = {
1907 .cg_item = {
1908 .ci_namebuf = "usb_gadget",
1909 .ci_type = &gadgets_type,
1910 },
1911 },
1912 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1913 };
1914
unregister_gadget_item(struct config_item * item)1915 void unregister_gadget_item(struct config_item *item)
1916 {
1917 struct gadget_info *gi = to_gadget_info(item);
1918
1919 mutex_lock(&gi->lock);
1920 unregister_gadget(gi);
1921 mutex_unlock(&gi->lock);
1922 }
1923 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1924
gadget_cfs_init(void)1925 static int __init gadget_cfs_init(void)
1926 {
1927 int ret;
1928
1929 config_group_init(&gadget_subsys.su_group);
1930
1931 ret = configfs_register_subsystem(&gadget_subsys);
1932
1933 #ifdef CONFIG_USB_CONFIGFS_UEVENT
1934 android_class = class_create(THIS_MODULE, "android_usb");
1935 if (IS_ERR(android_class))
1936 return PTR_ERR(android_class);
1937 #endif
1938
1939 return ret;
1940 }
1941 module_init(gadget_cfs_init);
1942
gadget_cfs_exit(void)1943 static void __exit gadget_cfs_exit(void)
1944 {
1945 configfs_unregister_subsystem(&gadget_subsys);
1946 #ifdef CONFIG_USB_CONFIGFS_UEVENT
1947 if (!IS_ERR(android_class))
1948 class_destroy(android_class);
1949 #endif
1950
1951 }
1952 module_exit(gadget_cfs_exit);
1953