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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
13int check_user_usb_string(const char *name,
14 struct usb_gadget_strings *stringtab_dev)
15{
16 unsigned primary_lang;
17 unsigned sub_lang;
18 u16 num;
19 int ret;
20
21 ret = kstrtou16(name, 0, &num);
22 if (ret)
23 return ret;
24
25 primary_lang = num & 0x3ff;
26 sub_lang = num >> 10;
27
28 /* simple sanity check for valid langid */
29 switch (primary_lang) {
30 case 0:
31 case 0x62 ... 0xfe:
32 case 0x100 ... 0x3ff:
33 return -EINVAL;
34 }
35 if (!sub_lang)
36 return -EINVAL;
37
38 stringtab_dev->language = num;
39 return 0;
40}
41
42#define MAX_NAME_LEN 40
43#define MAX_USB_STRING_LANGS 2
44
45static const struct usb_descriptor_header *otg_desc[2];
46
47struct gadget_info {
48 struct config_group group;
49 struct config_group functions_group;
50 struct config_group configs_group;
51 struct config_group strings_group;
52 struct config_group os_desc_group;
53
54 struct mutex lock;
55 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
56 struct list_head string_list;
57 struct list_head available_func;
58
59 struct usb_composite_driver composite;
60 struct usb_composite_dev cdev;
61 bool use_os_desc;
62 char b_vendor_code;
63 char qw_sign[OS_STRING_QW_SIGN_LEN];
64 spinlock_t spinlock;
65 bool unbind;
66};
67
68static inline struct gadget_info *to_gadget_info(struct config_item *item)
69{
70 return container_of(to_config_group(item), struct gadget_info, group);
71}
72
73struct config_usb_cfg {
74 struct config_group group;
75 struct config_group strings_group;
76 struct list_head string_list;
77 struct usb_configuration c;
78 struct list_head func_list;
79 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
80};
81
82static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
83{
84 return container_of(to_config_group(item), struct config_usb_cfg,
85 group);
86}
87
88struct gadget_strings {
89 struct usb_gadget_strings stringtab_dev;
90 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
91 char *manufacturer;
92 char *product;
93 char *serialnumber;
94
95 struct config_group group;
96 struct list_head list;
97};
98
99struct os_desc {
100 struct config_group group;
101};
102
103struct gadget_config_name {
104 struct usb_gadget_strings stringtab_dev;
105 struct usb_string strings;
106 char *configuration;
107
108 struct config_group group;
109 struct list_head list;
110};
111
112static int usb_string_copy(const char *s, char **s_copy)
113{
114 int ret;
115 char *str;
116 char *copy = *s_copy;
117 ret = strlen(s);
118 if (ret > 126)
119 return -EOVERFLOW;
120
121 str = kstrdup(s, GFP_KERNEL);
122 if (!str)
123 return -ENOMEM;
124 if (str[ret - 1] == '\n')
125 str[ret - 1] = '\0';
126 kfree(copy);
127 *s_copy = str;
128 return 0;
129}
130
131#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
132static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
133 char *page) \
134{ \
135 return sprintf(page, "0x%02x\n", \
136 to_gadget_info(item)->cdev.desc.__name); \
137}
138
139#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
140static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
141 char *page) \
142{ \
143 return sprintf(page, "0x%04x\n", \
144 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
145}
146
147
148#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
149static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
150 const char *page, size_t len) \
151{ \
152 u8 val; \
153 int ret; \
154 ret = kstrtou8(page, 0, &val); \
155 if (ret) \
156 return ret; \
157 to_gadget_info(item)->cdev.desc._name = val; \
158 return len; \
159}
160
161#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
162static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
163 const char *page, size_t len) \
164{ \
165 u16 val; \
166 int ret; \
167 ret = kstrtou16(page, 0, &val); \
168 if (ret) \
169 return ret; \
170 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
171 return len; \
172}
173
174#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
175 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
176 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
177
178GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
179GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
180GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
181GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
182GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
183GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
184GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
185GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
186
187static ssize_t is_valid_bcd(u16 bcd_val)
188{
189 if ((bcd_val & 0xf) > 9)
190 return -EINVAL;
191 if (((bcd_val >> 4) & 0xf) > 9)
192 return -EINVAL;
193 if (((bcd_val >> 8) & 0xf) > 9)
194 return -EINVAL;
195 if (((bcd_val >> 12) & 0xf) > 9)
196 return -EINVAL;
197 return 0;
198}
199
200static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
201 const char *page, size_t len)
202{
203 u16 bcdDevice;
204 int ret;
205
206 ret = kstrtou16(page, 0, &bcdDevice);
207 if (ret)
208 return ret;
209 ret = is_valid_bcd(bcdDevice);
210 if (ret)
211 return ret;
212
213 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
214 return len;
215}
216
217static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
218 const char *page, size_t len)
219{
220 u16 bcdUSB;
221 int ret;
222
223 ret = kstrtou16(page, 0, &bcdUSB);
224 if (ret)
225 return ret;
226 ret = is_valid_bcd(bcdUSB);
227 if (ret)
228 return ret;
229
230 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
231 return len;
232}
233
234static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
235{
236 char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name;
237
238 return sprintf(page, "%s\n", udc_name ?: "");
239}
240
241static int unregister_gadget(struct gadget_info *gi)
242{
243 int ret;
244
245 if (!gi->composite.gadget_driver.udc_name)
246 return -ENODEV;
247
248 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
249 if (ret)
250 return ret;
251 kfree(gi->composite.gadget_driver.udc_name);
252 gi->composite.gadget_driver.udc_name = NULL;
253 return 0;
254}
255
256static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
257 const char *page, size_t len)
258{
259 struct gadget_info *gi = to_gadget_info(item);
260 char *name;
261 int ret;
262
263 name = kstrdup(page, GFP_KERNEL);
264 if (!name)
265 return -ENOMEM;
266 if (name[len - 1] == '\n')
267 name[len - 1] = '\0';
268
269 mutex_lock(&gi->lock);
270
271 if (!strlen(name)) {
272 ret = unregister_gadget(gi);
273 if (ret)
274 goto err;
275 kfree(name);
276 } else {
277 if (gi->composite.gadget_driver.udc_name) {
278 ret = -EBUSY;
279 goto err;
280 }
281 gi->composite.gadget_driver.udc_name = name;
282 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
283 if (ret) {
284 gi->composite.gadget_driver.udc_name = NULL;
285 goto err;
286 }
287 }
288 mutex_unlock(&gi->lock);
289 return len;
290err:
291 kfree(name);
292 mutex_unlock(&gi->lock);
293 return ret;
294}
295
296CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
297CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
298CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
299CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
300CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
301CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
302CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
303CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
304CONFIGFS_ATTR(gadget_dev_desc_, UDC);
305
306static struct configfs_attribute *gadget_root_attrs[] = {
307 &gadget_dev_desc_attr_bDeviceClass,
308 &gadget_dev_desc_attr_bDeviceSubClass,
309 &gadget_dev_desc_attr_bDeviceProtocol,
310 &gadget_dev_desc_attr_bMaxPacketSize0,
311 &gadget_dev_desc_attr_idVendor,
312 &gadget_dev_desc_attr_idProduct,
313 &gadget_dev_desc_attr_bcdDevice,
314 &gadget_dev_desc_attr_bcdUSB,
315 &gadget_dev_desc_attr_UDC,
316 NULL,
317};
318
319static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
320{
321 return container_of(to_config_group(item), struct gadget_strings,
322 group);
323}
324
325static inline struct gadget_config_name *to_gadget_config_name(
326 struct config_item *item)
327{
328 return container_of(to_config_group(item), struct gadget_config_name,
329 group);
330}
331
332static inline struct usb_function_instance *to_usb_function_instance(
333 struct config_item *item)
334{
335 return container_of(to_config_group(item),
336 struct usb_function_instance, group);
337}
338
339static void gadget_info_attr_release(struct config_item *item)
340{
341 struct gadget_info *gi = to_gadget_info(item);
342
343 WARN_ON(!list_empty(&gi->cdev.configs));
344 WARN_ON(!list_empty(&gi->string_list));
345 WARN_ON(!list_empty(&gi->available_func));
346 kfree(gi->composite.gadget_driver.function);
347 kfree(gi);
348}
349
350static struct configfs_item_operations gadget_root_item_ops = {
351 .release = gadget_info_attr_release,
352};
353
354static void gadget_config_attr_release(struct config_item *item)
355{
356 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
357
358 WARN_ON(!list_empty(&cfg->c.functions));
359 list_del(&cfg->c.list);
360 kfree(cfg->c.label);
361 kfree(cfg);
362}
363
364static int config_usb_cfg_link(
365 struct config_item *usb_cfg_ci,
366 struct config_item *usb_func_ci)
367{
368 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
369 struct usb_composite_dev *cdev = cfg->c.cdev;
370 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
371
372 struct config_group *group = to_config_group(usb_func_ci);
373 struct usb_function_instance *fi = container_of(group,
374 struct usb_function_instance, group);
375 struct usb_function_instance *a_fi;
376 struct usb_function *f;
377 int ret;
378
379 mutex_lock(&gi->lock);
380 /*
381 * Make sure this function is from within our _this_ gadget and not
382 * from another gadget or a random directory.
383 * Also a function instance can only be linked once.
384 */
385 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
386 if (a_fi == fi)
387 break;
388 }
389 if (a_fi != fi) {
390 ret = -EINVAL;
391 goto out;
392 }
393
394 list_for_each_entry(f, &cfg->func_list, list) {
395 if (f->fi == fi) {
396 ret = -EEXIST;
397 goto out;
398 }
399 }
400
401 f = usb_get_function(fi);
402 if (IS_ERR(f)) {
403 ret = PTR_ERR(f);
404 goto out;
405 }
406
407 /* stash the function until we bind it to the gadget */
408 list_add_tail(&f->list, &cfg->func_list);
409 ret = 0;
410out:
411 mutex_unlock(&gi->lock);
412 return ret;
413}
414
415static void config_usb_cfg_unlink(
416 struct config_item *usb_cfg_ci,
417 struct config_item *usb_func_ci)
418{
419 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
420 struct usb_composite_dev *cdev = cfg->c.cdev;
421 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
422
423 struct config_group *group = to_config_group(usb_func_ci);
424 struct usb_function_instance *fi = container_of(group,
425 struct usb_function_instance, group);
426 struct usb_function *f;
427
428 /*
429 * ideally I would like to forbid to unlink functions while a gadget is
430 * bound to an UDC. Since this isn't possible at the moment, we simply
431 * force an unbind, the function is available here and then we can
432 * remove the function.
433 */
434 mutex_lock(&gi->lock);
435 if (gi->composite.gadget_driver.udc_name)
436 unregister_gadget(gi);
437 WARN_ON(gi->composite.gadget_driver.udc_name);
438
439 list_for_each_entry(f, &cfg->func_list, list) {
440 if (f->fi == fi) {
441 list_del(&f->list);
442 usb_put_function(f);
443 mutex_unlock(&gi->lock);
444 return;
445 }
446 }
447 mutex_unlock(&gi->lock);
448 WARN(1, "Unable to locate function to unbind\n");
449}
450
451static struct configfs_item_operations gadget_config_item_ops = {
452 .release = gadget_config_attr_release,
453 .allow_link = config_usb_cfg_link,
454 .drop_link = config_usb_cfg_unlink,
455};
456
457
458static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
459 char *page)
460{
461 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
462}
463
464static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
465 const char *page, size_t len)
466{
467 u16 val;
468 int ret;
469 ret = kstrtou16(page, 0, &val);
470 if (ret)
471 return ret;
472 if (DIV_ROUND_UP(val, 8) > 0xff)
473 return -ERANGE;
474 to_config_usb_cfg(item)->c.MaxPower = val;
475 return len;
476}
477
478static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
479 char *page)
480{
481 return sprintf(page, "0x%02x\n",
482 to_config_usb_cfg(item)->c.bmAttributes);
483}
484
485static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
486 const char *page, size_t len)
487{
488 u8 val;
489 int ret;
490 ret = kstrtou8(page, 0, &val);
491 if (ret)
492 return ret;
493 if (!(val & USB_CONFIG_ATT_ONE))
494 return -EINVAL;
495 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
496 USB_CONFIG_ATT_WAKEUP))
497 return -EINVAL;
498 to_config_usb_cfg(item)->c.bmAttributes = val;
499 return len;
500}
501
502CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
503CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
504
505static struct configfs_attribute *gadget_config_attrs[] = {
506 &gadget_config_desc_attr_MaxPower,
507 &gadget_config_desc_attr_bmAttributes,
508 NULL,
509};
510
511static const struct config_item_type gadget_config_type = {
512 .ct_item_ops = &gadget_config_item_ops,
513 .ct_attrs = gadget_config_attrs,
514 .ct_owner = THIS_MODULE,
515};
516
517static const struct config_item_type gadget_root_type = {
518 .ct_item_ops = &gadget_root_item_ops,
519 .ct_attrs = gadget_root_attrs,
520 .ct_owner = THIS_MODULE,
521};
522
523static void composite_init_dev(struct usb_composite_dev *cdev)
524{
525 spin_lock_init(&cdev->lock);
526 INIT_LIST_HEAD(&cdev->configs);
527 INIT_LIST_HEAD(&cdev->gstrings);
528}
529
530static struct config_group *function_make(
531 struct config_group *group,
532 const char *name)
533{
534 struct gadget_info *gi;
535 struct usb_function_instance *fi;
536 char buf[MAX_NAME_LEN];
537 char *func_name;
538 char *instance_name;
539 int ret;
540
541 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
542 if (ret >= MAX_NAME_LEN)
543 return ERR_PTR(-ENAMETOOLONG);
544
545 func_name = buf;
546 instance_name = strchr(func_name, '.');
547 if (!instance_name) {
548 pr_err("Unable to locate . in FUNC.INSTANCE\n");
549 return ERR_PTR(-EINVAL);
550 }
551 *instance_name = '\0';
552 instance_name++;
553
554 fi = usb_get_function_instance(func_name);
555 if (IS_ERR(fi))
556 return ERR_CAST(fi);
557
558 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
559 if (ret) {
560 usb_put_function_instance(fi);
561 return ERR_PTR(ret);
562 }
563 if (fi->set_inst_name) {
564 ret = fi->set_inst_name(fi, instance_name);
565 if (ret) {
566 usb_put_function_instance(fi);
567 return ERR_PTR(ret);
568 }
569 }
570
571 gi = container_of(group, struct gadget_info, functions_group);
572
573 mutex_lock(&gi->lock);
574 list_add_tail(&fi->cfs_list, &gi->available_func);
575 mutex_unlock(&gi->lock);
576 return &fi->group;
577}
578
579static void function_drop(
580 struct config_group *group,
581 struct config_item *item)
582{
583 struct usb_function_instance *fi = to_usb_function_instance(item);
584 struct gadget_info *gi;
585
586 gi = container_of(group, struct gadget_info, functions_group);
587
588 mutex_lock(&gi->lock);
589 list_del(&fi->cfs_list);
590 mutex_unlock(&gi->lock);
591 config_item_put(item);
592}
593
594static struct configfs_group_operations functions_ops = {
595 .make_group = &function_make,
596 .drop_item = &function_drop,
597};
598
599static const struct config_item_type functions_type = {
600 .ct_group_ops = &functions_ops,
601 .ct_owner = THIS_MODULE,
602};
603
604GS_STRINGS_RW(gadget_config_name, configuration);
605
606static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
607 &gadget_config_name_attr_configuration,
608 NULL,
609};
610
611static void gadget_config_name_attr_release(struct config_item *item)
612{
613 struct gadget_config_name *cn = to_gadget_config_name(item);
614
615 kfree(cn->configuration);
616
617 list_del(&cn->list);
618 kfree(cn);
619}
620
621USB_CONFIG_STRING_RW_OPS(gadget_config_name);
622USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
623
624static struct config_group *config_desc_make(
625 struct config_group *group,
626 const char *name)
627{
628 struct gadget_info *gi;
629 struct config_usb_cfg *cfg;
630 char buf[MAX_NAME_LEN];
631 char *num_str;
632 u8 num;
633 int ret;
634
635 gi = container_of(group, struct gadget_info, configs_group);
636 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
637 if (ret >= MAX_NAME_LEN)
638 return ERR_PTR(-ENAMETOOLONG);
639
640 num_str = strchr(buf, '.');
641 if (!num_str) {
642 pr_err("Unable to locate . in name.bConfigurationValue\n");
643 return ERR_PTR(-EINVAL);
644 }
645
646 *num_str = '\0';
647 num_str++;
648
649 if (!strlen(buf))
650 return ERR_PTR(-EINVAL);
651
652 ret = kstrtou8(num_str, 0, &num);
653 if (ret)
654 return ERR_PTR(ret);
655
656 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
657 if (!cfg)
658 return ERR_PTR(-ENOMEM);
659 cfg->c.label = kstrdup(buf, GFP_KERNEL);
660 if (!cfg->c.label) {
661 ret = -ENOMEM;
662 goto err;
663 }
664 cfg->c.bConfigurationValue = num;
665 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
666 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
667 INIT_LIST_HEAD(&cfg->string_list);
668 INIT_LIST_HEAD(&cfg->func_list);
669
670 config_group_init_type_name(&cfg->group, name,
671 &gadget_config_type);
672
673 config_group_init_type_name(&cfg->strings_group, "strings",
674 &gadget_config_name_strings_type);
675 configfs_add_default_group(&cfg->strings_group, &cfg->group);
676
677 ret = usb_add_config_only(&gi->cdev, &cfg->c);
678 if (ret)
679 goto err;
680
681 return &cfg->group;
682err:
683 kfree(cfg->c.label);
684 kfree(cfg);
685 return ERR_PTR(ret);
686}
687
688static void config_desc_drop(
689 struct config_group *group,
690 struct config_item *item)
691{
692 config_item_put(item);
693}
694
695static struct configfs_group_operations config_desc_ops = {
696 .make_group = &config_desc_make,
697 .drop_item = &config_desc_drop,
698};
699
700static const struct config_item_type config_desc_type = {
701 .ct_group_ops = &config_desc_ops,
702 .ct_owner = THIS_MODULE,
703};
704
705GS_STRINGS_RW(gadget_strings, manufacturer);
706GS_STRINGS_RW(gadget_strings, product);
707GS_STRINGS_RW(gadget_strings, serialnumber);
708
709static struct configfs_attribute *gadget_strings_langid_attrs[] = {
710 &gadget_strings_attr_manufacturer,
711 &gadget_strings_attr_product,
712 &gadget_strings_attr_serialnumber,
713 NULL,
714};
715
716static void gadget_strings_attr_release(struct config_item *item)
717{
718 struct gadget_strings *gs = to_gadget_strings(item);
719
720 kfree(gs->manufacturer);
721 kfree(gs->product);
722 kfree(gs->serialnumber);
723
724 list_del(&gs->list);
725 kfree(gs);
726}
727
728USB_CONFIG_STRING_RW_OPS(gadget_strings);
729USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
730
731static inline struct os_desc *to_os_desc(struct config_item *item)
732{
733 return container_of(to_config_group(item), struct os_desc, group);
734}
735
736static inline struct gadget_info *os_desc_item_to_gadget_info(
737 struct config_item *item)
738{
739 return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
740}
741
742static ssize_t os_desc_use_show(struct config_item *item, char *page)
743{
744 return sprintf(page, "%d\n",
745 os_desc_item_to_gadget_info(item)->use_os_desc);
746}
747
748static ssize_t os_desc_use_store(struct config_item *item, const char *page,
749 size_t len)
750{
751 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
752 int ret;
753 bool use;
754
755 mutex_lock(&gi->lock);
756 ret = strtobool(page, &use);
757 if (!ret) {
758 gi->use_os_desc = use;
759 ret = len;
760 }
761 mutex_unlock(&gi->lock);
762
763 return ret;
764}
765
766static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
767{
768 return sprintf(page, "0x%02x\n",
769 os_desc_item_to_gadget_info(item)->b_vendor_code);
770}
771
772static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
773 const char *page, size_t len)
774{
775 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
776 int ret;
777 u8 b_vendor_code;
778
779 mutex_lock(&gi->lock);
780 ret = kstrtou8(page, 0, &b_vendor_code);
781 if (!ret) {
782 gi->b_vendor_code = b_vendor_code;
783 ret = len;
784 }
785 mutex_unlock(&gi->lock);
786
787 return ret;
788}
789
790static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
791{
792 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
793 int res;
794
795 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
796 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
797 page[res++] = '\n';
798
799 return res;
800}
801
802static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
803 size_t len)
804{
805 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
806 int res, l;
807
808 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
809 if (page[l - 1] == '\n')
810 --l;
811
812 mutex_lock(&gi->lock);
813 res = utf8s_to_utf16s(page, l,
814 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
815 OS_STRING_QW_SIGN_LEN);
816 if (res > 0)
817 res = len;
818 mutex_unlock(&gi->lock);
819
820 return res;
821}
822
823CONFIGFS_ATTR(os_desc_, use);
824CONFIGFS_ATTR(os_desc_, b_vendor_code);
825CONFIGFS_ATTR(os_desc_, qw_sign);
826
827static struct configfs_attribute *os_desc_attrs[] = {
828 &os_desc_attr_use,
829 &os_desc_attr_b_vendor_code,
830 &os_desc_attr_qw_sign,
831 NULL,
832};
833
834static void os_desc_attr_release(struct config_item *item)
835{
836 struct os_desc *os_desc = to_os_desc(item);
837 kfree(os_desc);
838}
839
840static int os_desc_link(struct config_item *os_desc_ci,
841 struct config_item *usb_cfg_ci)
842{
843 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
844 struct gadget_info, os_desc_group);
845 struct usb_composite_dev *cdev = &gi->cdev;
846 struct config_usb_cfg *c_target =
847 container_of(to_config_group(usb_cfg_ci),
848 struct config_usb_cfg, group);
849 struct usb_configuration *c;
850 int ret;
851
852 mutex_lock(&gi->lock);
853 list_for_each_entry(c, &cdev->configs, list) {
854 if (c == &c_target->c)
855 break;
856 }
857 if (c != &c_target->c) {
858 ret = -EINVAL;
859 goto out;
860 }
861
862 if (cdev->os_desc_config) {
863 ret = -EBUSY;
864 goto out;
865 }
866
867 cdev->os_desc_config = &c_target->c;
868 ret = 0;
869
870out:
871 mutex_unlock(&gi->lock);
872 return ret;
873}
874
875static void os_desc_unlink(struct config_item *os_desc_ci,
876 struct config_item *usb_cfg_ci)
877{
878 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
879 struct gadget_info, os_desc_group);
880 struct usb_composite_dev *cdev = &gi->cdev;
881
882 mutex_lock(&gi->lock);
883 if (gi->composite.gadget_driver.udc_name)
884 unregister_gadget(gi);
885 cdev->os_desc_config = NULL;
886 WARN_ON(gi->composite.gadget_driver.udc_name);
887 mutex_unlock(&gi->lock);
888}
889
890static struct configfs_item_operations os_desc_ops = {
891 .release = os_desc_attr_release,
892 .allow_link = os_desc_link,
893 .drop_link = os_desc_unlink,
894};
895
896static struct config_item_type os_desc_type = {
897 .ct_item_ops = &os_desc_ops,
898 .ct_attrs = os_desc_attrs,
899 .ct_owner = THIS_MODULE,
900};
901
902static inline struct usb_os_desc_ext_prop
903*to_usb_os_desc_ext_prop(struct config_item *item)
904{
905 return container_of(item, struct usb_os_desc_ext_prop, item);
906}
907
908static ssize_t ext_prop_type_show(struct config_item *item, char *page)
909{
910 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
911}
912
913static ssize_t ext_prop_type_store(struct config_item *item,
914 const char *page, size_t len)
915{
916 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
917 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
918 u8 type;
919 int ret;
920
921 if (desc->opts_mutex)
922 mutex_lock(desc->opts_mutex);
923 ret = kstrtou8(page, 0, &type);
924 if (ret)
925 goto end;
926 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
927 ret = -EINVAL;
928 goto end;
929 }
930
931 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
932 ext_prop->type == USB_EXT_PROP_LE32 ||
933 ext_prop->type == USB_EXT_PROP_BE32) &&
934 (type == USB_EXT_PROP_UNICODE ||
935 type == USB_EXT_PROP_UNICODE_ENV ||
936 type == USB_EXT_PROP_UNICODE_LINK))
937 ext_prop->data_len <<= 1;
938 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
939 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
940 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
941 (type == USB_EXT_PROP_BINARY ||
942 type == USB_EXT_PROP_LE32 ||
943 type == USB_EXT_PROP_BE32))
944 ext_prop->data_len >>= 1;
945 ext_prop->type = type;
946 ret = len;
947
948end:
949 if (desc->opts_mutex)
950 mutex_unlock(desc->opts_mutex);
951 return ret;
952}
953
954static ssize_t ext_prop_data_show(struct config_item *item, char *page)
955{
956 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
957 int len = ext_prop->data_len;
958
959 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
960 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
961 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
962 len >>= 1;
963 memcpy(page, ext_prop->data, len);
964
965 return len;
966}
967
968static ssize_t ext_prop_data_store(struct config_item *item,
969 const char *page, size_t len)
970{
971 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
972 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
973 char *new_data;
974 size_t ret_len = len;
975
976 if (page[len - 1] == '\n' || page[len - 1] == '\0')
977 --len;
978 new_data = kmemdup(page, len, GFP_KERNEL);
979 if (!new_data)
980 return -ENOMEM;
981
982 if (desc->opts_mutex)
983 mutex_lock(desc->opts_mutex);
984 kfree(ext_prop->data);
985 ext_prop->data = new_data;
986 desc->ext_prop_len -= ext_prop->data_len;
987 ext_prop->data_len = len;
988 desc->ext_prop_len += ext_prop->data_len;
989 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
990 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
991 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
992 desc->ext_prop_len -= ext_prop->data_len;
993 ext_prop->data_len <<= 1;
994 ext_prop->data_len += 2;
995 desc->ext_prop_len += ext_prop->data_len;
996 }
997 if (desc->opts_mutex)
998 mutex_unlock(desc->opts_mutex);
999 return ret_len;
1000}
1001
1002CONFIGFS_ATTR(ext_prop_, type);
1003CONFIGFS_ATTR(ext_prop_, data);
1004
1005static struct configfs_attribute *ext_prop_attrs[] = {
1006 &ext_prop_attr_type,
1007 &ext_prop_attr_data,
1008 NULL,
1009};
1010
1011static void usb_os_desc_ext_prop_release(struct config_item *item)
1012{
1013 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1014
1015 kfree(ext_prop); /* frees a whole chunk */
1016}
1017
1018static struct configfs_item_operations ext_prop_ops = {
1019 .release = usb_os_desc_ext_prop_release,
1020};
1021
1022static struct config_item *ext_prop_make(
1023 struct config_group *group,
1024 const char *name)
1025{
1026 struct usb_os_desc_ext_prop *ext_prop;
1027 struct config_item_type *ext_prop_type;
1028 struct usb_os_desc *desc;
1029 char *vlabuf;
1030
1031 vla_group(data_chunk);
1032 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1033 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1034
1035 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1036 if (!vlabuf)
1037 return ERR_PTR(-ENOMEM);
1038
1039 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1040 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1041
1042 desc = container_of(group, struct usb_os_desc, group);
1043 ext_prop_type->ct_item_ops = &ext_prop_ops;
1044 ext_prop_type->ct_attrs = ext_prop_attrs;
1045 ext_prop_type->ct_owner = desc->owner;
1046
1047 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1048
1049 ext_prop->name = kstrdup(name, GFP_KERNEL);
1050 if (!ext_prop->name) {
1051 kfree(vlabuf);
1052 return ERR_PTR(-ENOMEM);
1053 }
1054 desc->ext_prop_len += 14;
1055 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1056 if (desc->opts_mutex)
1057 mutex_lock(desc->opts_mutex);
1058 desc->ext_prop_len += ext_prop->name_len;
1059 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1060 ++desc->ext_prop_count;
1061 if (desc->opts_mutex)
1062 mutex_unlock(desc->opts_mutex);
1063
1064 return &ext_prop->item;
1065}
1066
1067static void ext_prop_drop(struct config_group *group, struct config_item *item)
1068{
1069 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1070 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1071
1072 if (desc->opts_mutex)
1073 mutex_lock(desc->opts_mutex);
1074 list_del(&ext_prop->entry);
1075 --desc->ext_prop_count;
1076 kfree(ext_prop->name);
1077 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1078 if (desc->opts_mutex)
1079 mutex_unlock(desc->opts_mutex);
1080 config_item_put(item);
1081}
1082
1083static struct configfs_group_operations interf_grp_ops = {
1084 .make_item = &ext_prop_make,
1085 .drop_item = &ext_prop_drop,
1086};
1087
1088static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1089 char *page)
1090{
1091 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1092 return 8;
1093}
1094
1095static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1096 const char *page, size_t len)
1097{
1098 struct usb_os_desc *desc = to_usb_os_desc(item);
1099 int l;
1100
1101 l = min_t(int, 8, len);
1102 if (page[l - 1] == '\n')
1103 --l;
1104 if (desc->opts_mutex)
1105 mutex_lock(desc->opts_mutex);
1106 memcpy(desc->ext_compat_id, page, l);
1107
1108 if (desc->opts_mutex)
1109 mutex_unlock(desc->opts_mutex);
1110
1111 return len;
1112}
1113
1114static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1115 char *page)
1116{
1117 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1118 return 8;
1119}
1120
1121static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1122 const char *page, size_t len)
1123{
1124 struct usb_os_desc *desc = to_usb_os_desc(item);
1125 int l;
1126
1127 l = min_t(int, 8, len);
1128 if (page[l - 1] == '\n')
1129 --l;
1130 if (desc->opts_mutex)
1131 mutex_lock(desc->opts_mutex);
1132 memcpy(desc->ext_compat_id + 8, page, l);
1133
1134 if (desc->opts_mutex)
1135 mutex_unlock(desc->opts_mutex);
1136
1137 return len;
1138}
1139
1140CONFIGFS_ATTR(interf_grp_, compatible_id);
1141CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1142
1143static struct configfs_attribute *interf_grp_attrs[] = {
1144 &interf_grp_attr_compatible_id,
1145 &interf_grp_attr_sub_compatible_id,
1146 NULL
1147};
1148
1149struct config_group *usb_os_desc_prepare_interf_dir(
1150 struct config_group *parent,
1151 int n_interf,
1152 struct usb_os_desc **desc,
1153 char **names,
1154 struct module *owner)
1155{
1156 struct config_group *os_desc_group;
1157 struct config_item_type *os_desc_type, *interface_type;
1158
1159 vla_group(data_chunk);
1160 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1161 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1162 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1163
1164 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1165 if (!vlabuf)
1166 return ERR_PTR(-ENOMEM);
1167
1168 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1169 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1170 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1171
1172 os_desc_type->ct_owner = owner;
1173 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1174 configfs_add_default_group(os_desc_group, parent);
1175
1176 interface_type->ct_group_ops = &interf_grp_ops;
1177 interface_type->ct_attrs = interf_grp_attrs;
1178 interface_type->ct_owner = owner;
1179
1180 while (n_interf--) {
1181 struct usb_os_desc *d;
1182
1183 d = desc[n_interf];
1184 d->owner = owner;
1185 config_group_init_type_name(&d->group, "", interface_type);
1186 config_item_set_name(&d->group.cg_item, "interface.%s",
1187 names[n_interf]);
1188 configfs_add_default_group(&d->group, os_desc_group);
1189 }
1190
1191 return os_desc_group;
1192}
1193EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1194
1195static int configfs_do_nothing(struct usb_composite_dev *cdev)
1196{
1197 WARN_ON(1);
1198 return -EINVAL;
1199}
1200
1201int composite_dev_prepare(struct usb_composite_driver *composite,
1202 struct usb_composite_dev *dev);
1203
1204int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1205 struct usb_ep *ep0);
1206
1207static void purge_configs_funcs(struct gadget_info *gi)
1208{
1209 struct usb_configuration *c;
1210
1211 list_for_each_entry(c, &gi->cdev.configs, list) {
1212 struct usb_function *f, *tmp;
1213 struct config_usb_cfg *cfg;
1214
1215 cfg = container_of(c, struct config_usb_cfg, c);
1216
1217 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1218
1219 list_move_tail(&f->list, &cfg->func_list);
1220 if (f->unbind) {
1221 dev_dbg(&gi->cdev.gadget->dev,
1222 "unbind function '%s'/%p\n",
1223 f->name, f);
1224 f->unbind(c, f);
1225 }
1226 }
1227 c->next_interface_id = 0;
1228 memset(c->interface, 0, sizeof(c->interface));
1229 c->superspeed_plus = 0;
1230 c->superspeed = 0;
1231 c->highspeed = 0;
1232 c->fullspeed = 0;
1233 }
1234}
1235
1236static int configfs_composite_bind(struct usb_gadget *gadget,
1237 struct usb_gadget_driver *gdriver)
1238{
1239 struct usb_composite_driver *composite = to_cdriver(gdriver);
1240 struct gadget_info *gi = container_of(composite,
1241 struct gadget_info, composite);
1242 struct usb_composite_dev *cdev = &gi->cdev;
1243 struct usb_configuration *c;
1244 struct usb_string *s;
1245 unsigned i;
1246 int ret;
1247
1248 /* the gi->lock is hold by the caller */
1249 gi->unbind = 0;
1250 cdev->gadget = gadget;
1251 set_gadget_data(gadget, cdev);
1252 ret = composite_dev_prepare(composite, cdev);
1253 if (ret)
1254 return ret;
1255 /* and now the gadget bind */
1256 ret = -EINVAL;
1257
1258 if (list_empty(&gi->cdev.configs)) {
1259 pr_err("Need at least one configuration in %s.\n",
1260 gi->composite.name);
1261 goto err_comp_cleanup;
1262 }
1263
1264
1265 list_for_each_entry(c, &gi->cdev.configs, list) {
1266 struct config_usb_cfg *cfg;
1267
1268 cfg = container_of(c, struct config_usb_cfg, c);
1269 if (list_empty(&cfg->func_list)) {
1270 pr_err("Config %s/%d of %s needs at least one function.\n",
1271 c->label, c->bConfigurationValue,
1272 gi->composite.name);
1273 goto err_comp_cleanup;
1274 }
1275 }
1276
1277 /* init all strings */
1278 if (!list_empty(&gi->string_list)) {
1279 struct gadget_strings *gs;
1280
1281 i = 0;
1282 list_for_each_entry(gs, &gi->string_list, list) {
1283
1284 gi->gstrings[i] = &gs->stringtab_dev;
1285 gs->stringtab_dev.strings = gs->strings;
1286 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1287 gs->manufacturer;
1288 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1289 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1290 i++;
1291 }
1292 gi->gstrings[i] = NULL;
1293 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1294 USB_GADGET_FIRST_AVAIL_IDX);
1295 if (IS_ERR(s)) {
1296 ret = PTR_ERR(s);
1297 goto err_comp_cleanup;
1298 }
1299
1300 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1301 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1302 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1303 }
1304
1305 if (gi->use_os_desc) {
1306 cdev->use_os_string = true;
1307 cdev->b_vendor_code = gi->b_vendor_code;
1308 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1309 }
1310
1311 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1312 struct usb_descriptor_header *usb_desc;
1313
1314 usb_desc = usb_otg_descriptor_alloc(gadget);
1315 if (!usb_desc) {
1316 ret = -ENOMEM;
1317 goto err_comp_cleanup;
1318 }
1319 usb_otg_descriptor_init(gadget, usb_desc);
1320 otg_desc[0] = usb_desc;
1321 otg_desc[1] = NULL;
1322 }
1323
1324 /* Go through all configs, attach all functions */
1325 list_for_each_entry(c, &gi->cdev.configs, list) {
1326 struct config_usb_cfg *cfg;
1327 struct usb_function *f;
1328 struct usb_function *tmp;
1329 struct gadget_config_name *cn;
1330
1331 if (gadget_is_otg(gadget))
1332 c->descriptors = otg_desc;
1333
1334 cfg = container_of(c, struct config_usb_cfg, c);
1335 if (!list_empty(&cfg->string_list)) {
1336 i = 0;
1337 list_for_each_entry(cn, &cfg->string_list, list) {
1338 cfg->gstrings[i] = &cn->stringtab_dev;
1339 cn->stringtab_dev.strings = &cn->strings;
1340 cn->strings.s = cn->configuration;
1341 i++;
1342 }
1343 cfg->gstrings[i] = NULL;
1344 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1345 if (IS_ERR(s)) {
1346 ret = PTR_ERR(s);
1347 goto err_comp_cleanup;
1348 }
1349 c->iConfiguration = s[0].id;
1350 }
1351
1352 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1353 list_del(&f->list);
1354 ret = usb_add_function(c, f);
1355 if (ret) {
1356 list_add(&f->list, &cfg->func_list);
1357 goto err_purge_funcs;
1358 }
1359 }
1360 usb_ep_autoconfig_reset(cdev->gadget);
1361 }
1362 if (cdev->use_os_string) {
1363 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1364 if (ret)
1365 goto err_purge_funcs;
1366 }
1367
1368 usb_ep_autoconfig_reset(cdev->gadget);
1369 return 0;
1370
1371err_purge_funcs:
1372 purge_configs_funcs(gi);
1373err_comp_cleanup:
1374 composite_dev_cleanup(cdev);
1375 return ret;
1376}
1377
1378static void configfs_composite_unbind(struct usb_gadget *gadget)
1379{
1380 struct usb_composite_dev *cdev;
1381 struct gadget_info *gi;
1382 unsigned long flags;
1383
1384 /* the gi->lock is hold by the caller */
1385
1386 cdev = get_gadget_data(gadget);
1387 gi = container_of(cdev, struct gadget_info, cdev);
1388 spin_lock_irqsave(&gi->spinlock, flags);
1389 gi->unbind = 1;
1390 spin_unlock_irqrestore(&gi->spinlock, flags);
1391
1392 kfree(otg_desc[0]);
1393 otg_desc[0] = NULL;
1394 purge_configs_funcs(gi);
1395 composite_dev_cleanup(cdev);
1396 usb_ep_autoconfig_reset(cdev->gadget);
1397 spin_lock_irqsave(&gi->spinlock, flags);
1398 cdev->gadget = NULL;
1399 set_gadget_data(gadget, NULL);
1400 spin_unlock_irqrestore(&gi->spinlock, flags);
1401}
1402
1403static int configfs_composite_setup(struct usb_gadget *gadget,
1404 const struct usb_ctrlrequest *ctrl)
1405{
1406 struct usb_composite_dev *cdev;
1407 struct gadget_info *gi;
1408 unsigned long flags;
1409 int ret;
1410
1411 cdev = get_gadget_data(gadget);
1412 if (!cdev)
1413 return 0;
1414
1415 gi = container_of(cdev, struct gadget_info, cdev);
1416 spin_lock_irqsave(&gi->spinlock, flags);
1417 cdev = get_gadget_data(gadget);
1418 if (!cdev || gi->unbind) {
1419 spin_unlock_irqrestore(&gi->spinlock, flags);
1420 return 0;
1421 }
1422
1423 ret = composite_setup(gadget, ctrl);
1424 spin_unlock_irqrestore(&gi->spinlock, flags);
1425 return ret;
1426}
1427
1428static void configfs_composite_disconnect(struct usb_gadget *gadget)
1429{
1430 struct usb_composite_dev *cdev;
1431 struct gadget_info *gi;
1432 unsigned long flags;
1433
1434 cdev = get_gadget_data(gadget);
1435 if (!cdev)
1436 return;
1437
1438 gi = container_of(cdev, struct gadget_info, cdev);
1439 spin_lock_irqsave(&gi->spinlock, flags);
1440 cdev = get_gadget_data(gadget);
1441 if (!cdev || gi->unbind) {
1442 spin_unlock_irqrestore(&gi->spinlock, flags);
1443 return;
1444 }
1445
1446 composite_disconnect(gadget);
1447 spin_unlock_irqrestore(&gi->spinlock, flags);
1448}
1449
1450static void configfs_composite_suspend(struct usb_gadget *gadget)
1451{
1452 struct usb_composite_dev *cdev;
1453 struct gadget_info *gi;
1454 unsigned long flags;
1455
1456 cdev = get_gadget_data(gadget);
1457 if (!cdev)
1458 return;
1459
1460 gi = container_of(cdev, struct gadget_info, cdev);
1461 spin_lock_irqsave(&gi->spinlock, flags);
1462 cdev = get_gadget_data(gadget);
1463 if (!cdev || gi->unbind) {
1464 spin_unlock_irqrestore(&gi->spinlock, flags);
1465 return;
1466 }
1467
1468 composite_suspend(gadget);
1469 spin_unlock_irqrestore(&gi->spinlock, flags);
1470}
1471
1472static void configfs_composite_resume(struct usb_gadget *gadget)
1473{
1474 struct usb_composite_dev *cdev;
1475 struct gadget_info *gi;
1476 unsigned long flags;
1477
1478 cdev = get_gadget_data(gadget);
1479 if (!cdev)
1480 return;
1481
1482 gi = container_of(cdev, struct gadget_info, cdev);
1483 spin_lock_irqsave(&gi->spinlock, flags);
1484 cdev = get_gadget_data(gadget);
1485 if (!cdev || gi->unbind) {
1486 spin_unlock_irqrestore(&gi->spinlock, flags);
1487 return;
1488 }
1489
1490 composite_resume(gadget);
1491 spin_unlock_irqrestore(&gi->spinlock, flags);
1492}
1493
1494static const struct usb_gadget_driver configfs_driver_template = {
1495 .bind = configfs_composite_bind,
1496 .unbind = configfs_composite_unbind,
1497
1498 .setup = configfs_composite_setup,
1499 .reset = configfs_composite_disconnect,
1500 .disconnect = configfs_composite_disconnect,
1501
1502 .suspend = configfs_composite_suspend,
1503 .resume = configfs_composite_resume,
1504
1505 .max_speed = USB_SPEED_SUPER,
1506 .driver = {
1507 .owner = THIS_MODULE,
1508 .name = "configfs-gadget",
1509 },
1510 .match_existing_only = 1,
1511};
1512
1513static struct config_group *gadgets_make(
1514 struct config_group *group,
1515 const char *name)
1516{
1517 struct gadget_info *gi;
1518
1519 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1520 if (!gi)
1521 return ERR_PTR(-ENOMEM);
1522
1523 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1524
1525 config_group_init_type_name(&gi->functions_group, "functions",
1526 &functions_type);
1527 configfs_add_default_group(&gi->functions_group, &gi->group);
1528
1529 config_group_init_type_name(&gi->configs_group, "configs",
1530 &config_desc_type);
1531 configfs_add_default_group(&gi->configs_group, &gi->group);
1532
1533 config_group_init_type_name(&gi->strings_group, "strings",
1534 &gadget_strings_strings_type);
1535 configfs_add_default_group(&gi->strings_group, &gi->group);
1536
1537 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1538 &os_desc_type);
1539 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1540
1541 gi->composite.bind = configfs_do_nothing;
1542 gi->composite.unbind = configfs_do_nothing;
1543 gi->composite.suspend = NULL;
1544 gi->composite.resume = NULL;
1545 gi->composite.max_speed = USB_SPEED_SUPER;
1546
1547 mutex_init(&gi->lock);
1548 INIT_LIST_HEAD(&gi->string_list);
1549 INIT_LIST_HEAD(&gi->available_func);
1550
1551 composite_init_dev(&gi->cdev);
1552 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1553 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1554 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1555
1556 gi->composite.gadget_driver = configfs_driver_template;
1557
1558 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1559 gi->composite.name = gi->composite.gadget_driver.function;
1560
1561 if (!gi->composite.gadget_driver.function)
1562 goto err;
1563
1564 return &gi->group;
1565err:
1566 kfree(gi);
1567 return ERR_PTR(-ENOMEM);
1568}
1569
1570static void gadgets_drop(struct config_group *group, struct config_item *item)
1571{
1572 config_item_put(item);
1573}
1574
1575static struct configfs_group_operations gadgets_ops = {
1576 .make_group = &gadgets_make,
1577 .drop_item = &gadgets_drop,
1578};
1579
1580static const struct config_item_type gadgets_type = {
1581 .ct_group_ops = &gadgets_ops,
1582 .ct_owner = THIS_MODULE,
1583};
1584
1585static struct configfs_subsystem gadget_subsys = {
1586 .su_group = {
1587 .cg_item = {
1588 .ci_namebuf = "usb_gadget",
1589 .ci_type = &gadgets_type,
1590 },
1591 },
1592 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1593};
1594
1595void unregister_gadget_item(struct config_item *item)
1596{
1597 struct gadget_info *gi = to_gadget_info(item);
1598
1599 mutex_lock(&gi->lock);
1600 unregister_gadget(gi);
1601 mutex_unlock(&gi->lock);
1602}
1603EXPORT_SYMBOL_GPL(unregister_gadget_item);
1604
1605static int __init gadget_cfs_init(void)
1606{
1607 int ret;
1608
1609 config_group_init(&gadget_subsys.su_group);
1610
1611 ret = configfs_register_subsystem(&gadget_subsys);
1612 return ret;
1613}
1614module_init(gadget_cfs_init);
1615
1616static void __exit gadget_cfs_exit(void)
1617{
1618 configfs_unregister_subsystem(&gadget_subsys);
1619}
1620module_exit(gadget_cfs_exit);