Loading...
1#include <linux/configfs.h>
2#include <linux/module.h>
3#include <linux/slab.h>
4#include <linux/device.h>
5#include <linux/nls.h>
6#include <linux/usb/composite.h>
7#include <linux/usb/gadget_configfs.h>
8#include "configfs.h"
9#include "u_f.h"
10#include "u_os_desc.h"
11
12int check_user_usb_string(const char *name,
13 struct usb_gadget_strings *stringtab_dev)
14{
15 unsigned primary_lang;
16 unsigned sub_lang;
17 u16 num;
18 int ret;
19
20 ret = kstrtou16(name, 0, &num);
21 if (ret)
22 return ret;
23
24 primary_lang = num & 0x3ff;
25 sub_lang = num >> 10;
26
27 /* simple sanity check for valid langid */
28 switch (primary_lang) {
29 case 0:
30 case 0x62 ... 0xfe:
31 case 0x100 ... 0x3ff:
32 return -EINVAL;
33 }
34 if (!sub_lang)
35 return -EINVAL;
36
37 stringtab_dev->language = num;
38 return 0;
39}
40
41#define MAX_NAME_LEN 40
42#define MAX_USB_STRING_LANGS 2
43
44static const struct usb_descriptor_header *otg_desc[2];
45
46struct gadget_info {
47 struct config_group group;
48 struct config_group functions_group;
49 struct config_group configs_group;
50 struct config_group strings_group;
51 struct config_group os_desc_group;
52
53 struct mutex lock;
54 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
55 struct list_head string_list;
56 struct list_head available_func;
57
58 struct usb_composite_driver composite;
59 struct usb_composite_dev cdev;
60 bool use_os_desc;
61 char b_vendor_code;
62 char qw_sign[OS_STRING_QW_SIGN_LEN];
63};
64
65static inline struct gadget_info *to_gadget_info(struct config_item *item)
66{
67 return container_of(to_config_group(item), struct gadget_info, group);
68}
69
70struct config_usb_cfg {
71 struct config_group group;
72 struct config_group strings_group;
73 struct list_head string_list;
74 struct usb_configuration c;
75 struct list_head func_list;
76 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
77};
78
79static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
80{
81 return container_of(to_config_group(item), struct config_usb_cfg,
82 group);
83}
84
85struct gadget_strings {
86 struct usb_gadget_strings stringtab_dev;
87 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
88 char *manufacturer;
89 char *product;
90 char *serialnumber;
91
92 struct config_group group;
93 struct list_head list;
94};
95
96struct os_desc {
97 struct config_group group;
98};
99
100struct gadget_config_name {
101 struct usb_gadget_strings stringtab_dev;
102 struct usb_string strings;
103 char *configuration;
104
105 struct config_group group;
106 struct list_head list;
107};
108
109static int usb_string_copy(const char *s, char **s_copy)
110{
111 int ret;
112 char *str;
113 char *copy = *s_copy;
114 ret = strlen(s);
115 if (ret > 126)
116 return -EOVERFLOW;
117
118 str = kstrdup(s, GFP_KERNEL);
119 if (!str)
120 return -ENOMEM;
121 if (str[ret - 1] == '\n')
122 str[ret - 1] = '\0';
123 kfree(copy);
124 *s_copy = str;
125 return 0;
126}
127
128#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
129static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
130 char *page) \
131{ \
132 return sprintf(page, "0x%02x\n", \
133 to_gadget_info(item)->cdev.desc.__name); \
134}
135
136#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
137static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
138 char *page) \
139{ \
140 return sprintf(page, "0x%04x\n", \
141 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
142}
143
144
145#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
146static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
147 const char *page, size_t len) \
148{ \
149 u8 val; \
150 int ret; \
151 ret = kstrtou8(page, 0, &val); \
152 if (ret) \
153 return ret; \
154 to_gadget_info(item)->cdev.desc._name = val; \
155 return len; \
156}
157
158#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
159static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
160 const char *page, size_t len) \
161{ \
162 u16 val; \
163 int ret; \
164 ret = kstrtou16(page, 0, &val); \
165 if (ret) \
166 return ret; \
167 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
168 return len; \
169}
170
171#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
172 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
173 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
174
175GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
176GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
177GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
178GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
179GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
180GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
181GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
182GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
183
184static ssize_t is_valid_bcd(u16 bcd_val)
185{
186 if ((bcd_val & 0xf) > 9)
187 return -EINVAL;
188 if (((bcd_val >> 4) & 0xf) > 9)
189 return -EINVAL;
190 if (((bcd_val >> 8) & 0xf) > 9)
191 return -EINVAL;
192 if (((bcd_val >> 12) & 0xf) > 9)
193 return -EINVAL;
194 return 0;
195}
196
197static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
198 const char *page, size_t len)
199{
200 u16 bcdDevice;
201 int ret;
202
203 ret = kstrtou16(page, 0, &bcdDevice);
204 if (ret)
205 return ret;
206 ret = is_valid_bcd(bcdDevice);
207 if (ret)
208 return ret;
209
210 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
211 return len;
212}
213
214static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
215 const char *page, size_t len)
216{
217 u16 bcdUSB;
218 int ret;
219
220 ret = kstrtou16(page, 0, &bcdUSB);
221 if (ret)
222 return ret;
223 ret = is_valid_bcd(bcdUSB);
224 if (ret)
225 return ret;
226
227 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
228 return len;
229}
230
231static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
232{
233 char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name;
234
235 return sprintf(page, "%s\n", udc_name ?: "");
236}
237
238static int unregister_gadget(struct gadget_info *gi)
239{
240 int ret;
241
242 if (!gi->composite.gadget_driver.udc_name)
243 return -ENODEV;
244
245 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
246 if (ret)
247 return ret;
248 kfree(gi->composite.gadget_driver.udc_name);
249 gi->composite.gadget_driver.udc_name = NULL;
250 return 0;
251}
252
253static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
254 const char *page, size_t len)
255{
256 struct gadget_info *gi = to_gadget_info(item);
257 char *name;
258 int ret;
259
260 name = kstrdup(page, GFP_KERNEL);
261 if (!name)
262 return -ENOMEM;
263 if (name[len - 1] == '\n')
264 name[len - 1] = '\0';
265
266 mutex_lock(&gi->lock);
267
268 if (!strlen(name)) {
269 ret = unregister_gadget(gi);
270 if (ret)
271 goto err;
272 } else {
273 if (gi->composite.gadget_driver.udc_name) {
274 ret = -EBUSY;
275 goto err;
276 }
277 gi->composite.gadget_driver.udc_name = name;
278 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
279 if (ret) {
280 gi->composite.gadget_driver.udc_name = NULL;
281 goto err;
282 }
283 }
284 mutex_unlock(&gi->lock);
285 return len;
286err:
287 kfree(name);
288 mutex_unlock(&gi->lock);
289 return ret;
290}
291
292CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
293CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
294CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
295CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
296CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
297CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
298CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
299CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
300CONFIGFS_ATTR(gadget_dev_desc_, UDC);
301
302static struct configfs_attribute *gadget_root_attrs[] = {
303 &gadget_dev_desc_attr_bDeviceClass,
304 &gadget_dev_desc_attr_bDeviceSubClass,
305 &gadget_dev_desc_attr_bDeviceProtocol,
306 &gadget_dev_desc_attr_bMaxPacketSize0,
307 &gadget_dev_desc_attr_idVendor,
308 &gadget_dev_desc_attr_idProduct,
309 &gadget_dev_desc_attr_bcdDevice,
310 &gadget_dev_desc_attr_bcdUSB,
311 &gadget_dev_desc_attr_UDC,
312 NULL,
313};
314
315static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
316{
317 return container_of(to_config_group(item), struct gadget_strings,
318 group);
319}
320
321static inline struct gadget_config_name *to_gadget_config_name(
322 struct config_item *item)
323{
324 return container_of(to_config_group(item), struct gadget_config_name,
325 group);
326}
327
328static inline struct usb_function_instance *to_usb_function_instance(
329 struct config_item *item)
330{
331 return container_of(to_config_group(item),
332 struct usb_function_instance, group);
333}
334
335static void gadget_info_attr_release(struct config_item *item)
336{
337 struct gadget_info *gi = to_gadget_info(item);
338
339 WARN_ON(!list_empty(&gi->cdev.configs));
340 WARN_ON(!list_empty(&gi->string_list));
341 WARN_ON(!list_empty(&gi->available_func));
342 kfree(gi->composite.gadget_driver.function);
343 kfree(gi);
344}
345
346static struct configfs_item_operations gadget_root_item_ops = {
347 .release = gadget_info_attr_release,
348};
349
350static void gadget_config_attr_release(struct config_item *item)
351{
352 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
353
354 WARN_ON(!list_empty(&cfg->c.functions));
355 list_del(&cfg->c.list);
356 kfree(cfg->c.label);
357 kfree(cfg);
358}
359
360static int config_usb_cfg_link(
361 struct config_item *usb_cfg_ci,
362 struct config_item *usb_func_ci)
363{
364 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
365 struct usb_composite_dev *cdev = cfg->c.cdev;
366 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
367
368 struct config_group *group = to_config_group(usb_func_ci);
369 struct usb_function_instance *fi = container_of(group,
370 struct usb_function_instance, group);
371 struct usb_function_instance *a_fi;
372 struct usb_function *f;
373 int ret;
374
375 mutex_lock(&gi->lock);
376 /*
377 * Make sure this function is from within our _this_ gadget and not
378 * from another gadget or a random directory.
379 * Also a function instance can only be linked once.
380 */
381 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
382 if (a_fi == fi)
383 break;
384 }
385 if (a_fi != fi) {
386 ret = -EINVAL;
387 goto out;
388 }
389
390 list_for_each_entry(f, &cfg->func_list, list) {
391 if (f->fi == fi) {
392 ret = -EEXIST;
393 goto out;
394 }
395 }
396
397 f = usb_get_function(fi);
398 if (IS_ERR(f)) {
399 ret = PTR_ERR(f);
400 goto out;
401 }
402
403 /* stash the function until we bind it to the gadget */
404 list_add_tail(&f->list, &cfg->func_list);
405 ret = 0;
406out:
407 mutex_unlock(&gi->lock);
408 return ret;
409}
410
411static int config_usb_cfg_unlink(
412 struct config_item *usb_cfg_ci,
413 struct config_item *usb_func_ci)
414{
415 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
416 struct usb_composite_dev *cdev = cfg->c.cdev;
417 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
418
419 struct config_group *group = to_config_group(usb_func_ci);
420 struct usb_function_instance *fi = container_of(group,
421 struct usb_function_instance, group);
422 struct usb_function *f;
423
424 /*
425 * ideally I would like to forbid to unlink functions while a gadget is
426 * bound to an UDC. Since this isn't possible at the moment, we simply
427 * force an unbind, the function is available here and then we can
428 * remove the function.
429 */
430 mutex_lock(&gi->lock);
431 if (gi->composite.gadget_driver.udc_name)
432 unregister_gadget(gi);
433 WARN_ON(gi->composite.gadget_driver.udc_name);
434
435 list_for_each_entry(f, &cfg->func_list, list) {
436 if (f->fi == fi) {
437 list_del(&f->list);
438 usb_put_function(f);
439 mutex_unlock(&gi->lock);
440 return 0;
441 }
442 }
443 mutex_unlock(&gi->lock);
444 WARN(1, "Unable to locate function to unbind\n");
445 return 0;
446}
447
448static struct configfs_item_operations gadget_config_item_ops = {
449 .release = gadget_config_attr_release,
450 .allow_link = config_usb_cfg_link,
451 .drop_link = config_usb_cfg_unlink,
452};
453
454
455static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
456 char *page)
457{
458 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
459}
460
461static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
462 const char *page, size_t len)
463{
464 u16 val;
465 int ret;
466 ret = kstrtou16(page, 0, &val);
467 if (ret)
468 return ret;
469 if (DIV_ROUND_UP(val, 8) > 0xff)
470 return -ERANGE;
471 to_config_usb_cfg(item)->c.MaxPower = val;
472 return len;
473}
474
475static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
476 char *page)
477{
478 return sprintf(page, "0x%02x\n",
479 to_config_usb_cfg(item)->c.bmAttributes);
480}
481
482static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
483 const char *page, size_t len)
484{
485 u8 val;
486 int ret;
487 ret = kstrtou8(page, 0, &val);
488 if (ret)
489 return ret;
490 if (!(val & USB_CONFIG_ATT_ONE))
491 return -EINVAL;
492 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
493 USB_CONFIG_ATT_WAKEUP))
494 return -EINVAL;
495 to_config_usb_cfg(item)->c.bmAttributes = val;
496 return len;
497}
498
499CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
500CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
501
502static struct configfs_attribute *gadget_config_attrs[] = {
503 &gadget_config_desc_attr_MaxPower,
504 &gadget_config_desc_attr_bmAttributes,
505 NULL,
506};
507
508static struct config_item_type gadget_config_type = {
509 .ct_item_ops = &gadget_config_item_ops,
510 .ct_attrs = gadget_config_attrs,
511 .ct_owner = THIS_MODULE,
512};
513
514static struct config_item_type gadget_root_type = {
515 .ct_item_ops = &gadget_root_item_ops,
516 .ct_attrs = gadget_root_attrs,
517 .ct_owner = THIS_MODULE,
518};
519
520static void composite_init_dev(struct usb_composite_dev *cdev)
521{
522 spin_lock_init(&cdev->lock);
523 INIT_LIST_HEAD(&cdev->configs);
524 INIT_LIST_HEAD(&cdev->gstrings);
525}
526
527static struct config_group *function_make(
528 struct config_group *group,
529 const char *name)
530{
531 struct gadget_info *gi;
532 struct usb_function_instance *fi;
533 char buf[MAX_NAME_LEN];
534 char *func_name;
535 char *instance_name;
536 int ret;
537
538 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
539 if (ret >= MAX_NAME_LEN)
540 return ERR_PTR(-ENAMETOOLONG);
541
542 func_name = buf;
543 instance_name = strchr(func_name, '.');
544 if (!instance_name) {
545 pr_err("Unable to locate . in FUNC.INSTANCE\n");
546 return ERR_PTR(-EINVAL);
547 }
548 *instance_name = '\0';
549 instance_name++;
550
551 fi = usb_get_function_instance(func_name);
552 if (IS_ERR(fi))
553 return ERR_CAST(fi);
554
555 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
556 if (ret) {
557 usb_put_function_instance(fi);
558 return ERR_PTR(ret);
559 }
560 if (fi->set_inst_name) {
561 ret = fi->set_inst_name(fi, instance_name);
562 if (ret) {
563 usb_put_function_instance(fi);
564 return ERR_PTR(ret);
565 }
566 }
567
568 gi = container_of(group, struct gadget_info, functions_group);
569
570 mutex_lock(&gi->lock);
571 list_add_tail(&fi->cfs_list, &gi->available_func);
572 mutex_unlock(&gi->lock);
573 return &fi->group;
574}
575
576static void function_drop(
577 struct config_group *group,
578 struct config_item *item)
579{
580 struct usb_function_instance *fi = to_usb_function_instance(item);
581 struct gadget_info *gi;
582
583 gi = container_of(group, struct gadget_info, functions_group);
584
585 mutex_lock(&gi->lock);
586 list_del(&fi->cfs_list);
587 mutex_unlock(&gi->lock);
588 config_item_put(item);
589}
590
591static struct configfs_group_operations functions_ops = {
592 .make_group = &function_make,
593 .drop_item = &function_drop,
594};
595
596static struct config_item_type functions_type = {
597 .ct_group_ops = &functions_ops,
598 .ct_owner = THIS_MODULE,
599};
600
601GS_STRINGS_RW(gadget_config_name, configuration);
602
603static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
604 &gadget_config_name_attr_configuration,
605 NULL,
606};
607
608static void gadget_config_name_attr_release(struct config_item *item)
609{
610 struct gadget_config_name *cn = to_gadget_config_name(item);
611
612 kfree(cn->configuration);
613
614 list_del(&cn->list);
615 kfree(cn);
616}
617
618USB_CONFIG_STRING_RW_OPS(gadget_config_name);
619USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
620
621static struct config_group *config_desc_make(
622 struct config_group *group,
623 const char *name)
624{
625 struct gadget_info *gi;
626 struct config_usb_cfg *cfg;
627 char buf[MAX_NAME_LEN];
628 char *num_str;
629 u8 num;
630 int ret;
631
632 gi = container_of(group, struct gadget_info, configs_group);
633 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
634 if (ret >= MAX_NAME_LEN)
635 return ERR_PTR(-ENAMETOOLONG);
636
637 num_str = strchr(buf, '.');
638 if (!num_str) {
639 pr_err("Unable to locate . in name.bConfigurationValue\n");
640 return ERR_PTR(-EINVAL);
641 }
642
643 *num_str = '\0';
644 num_str++;
645
646 if (!strlen(buf))
647 return ERR_PTR(-EINVAL);
648
649 ret = kstrtou8(num_str, 0, &num);
650 if (ret)
651 return ERR_PTR(ret);
652
653 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
654 if (!cfg)
655 return ERR_PTR(-ENOMEM);
656 cfg->c.label = kstrdup(buf, GFP_KERNEL);
657 if (!cfg->c.label) {
658 ret = -ENOMEM;
659 goto err;
660 }
661 cfg->c.bConfigurationValue = num;
662 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
663 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
664 INIT_LIST_HEAD(&cfg->string_list);
665 INIT_LIST_HEAD(&cfg->func_list);
666
667 config_group_init_type_name(&cfg->group, name,
668 &gadget_config_type);
669
670 config_group_init_type_name(&cfg->strings_group, "strings",
671 &gadget_config_name_strings_type);
672 configfs_add_default_group(&cfg->strings_group, &cfg->group);
673
674 ret = usb_add_config_only(&gi->cdev, &cfg->c);
675 if (ret)
676 goto err;
677
678 return &cfg->group;
679err:
680 kfree(cfg->c.label);
681 kfree(cfg);
682 return ERR_PTR(ret);
683}
684
685static void config_desc_drop(
686 struct config_group *group,
687 struct config_item *item)
688{
689 config_item_put(item);
690}
691
692static struct configfs_group_operations config_desc_ops = {
693 .make_group = &config_desc_make,
694 .drop_item = &config_desc_drop,
695};
696
697static struct config_item_type config_desc_type = {
698 .ct_group_ops = &config_desc_ops,
699 .ct_owner = THIS_MODULE,
700};
701
702GS_STRINGS_RW(gadget_strings, manufacturer);
703GS_STRINGS_RW(gadget_strings, product);
704GS_STRINGS_RW(gadget_strings, serialnumber);
705
706static struct configfs_attribute *gadget_strings_langid_attrs[] = {
707 &gadget_strings_attr_manufacturer,
708 &gadget_strings_attr_product,
709 &gadget_strings_attr_serialnumber,
710 NULL,
711};
712
713static void gadget_strings_attr_release(struct config_item *item)
714{
715 struct gadget_strings *gs = to_gadget_strings(item);
716
717 kfree(gs->manufacturer);
718 kfree(gs->product);
719 kfree(gs->serialnumber);
720
721 list_del(&gs->list);
722 kfree(gs);
723}
724
725USB_CONFIG_STRING_RW_OPS(gadget_strings);
726USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
727
728static inline struct os_desc *to_os_desc(struct config_item *item)
729{
730 return container_of(to_config_group(item), struct os_desc, group);
731}
732
733static inline struct gadget_info *os_desc_item_to_gadget_info(
734 struct config_item *item)
735{
736 return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
737}
738
739static ssize_t os_desc_use_show(struct config_item *item, char *page)
740{
741 return sprintf(page, "%d",
742 os_desc_item_to_gadget_info(item)->use_os_desc);
743}
744
745static ssize_t os_desc_use_store(struct config_item *item, const char *page,
746 size_t len)
747{
748 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
749 int ret;
750 bool use;
751
752 mutex_lock(&gi->lock);
753 ret = strtobool(page, &use);
754 if (!ret) {
755 gi->use_os_desc = use;
756 ret = len;
757 }
758 mutex_unlock(&gi->lock);
759
760 return ret;
761}
762
763static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
764{
765 return sprintf(page, "%d",
766 os_desc_item_to_gadget_info(item)->b_vendor_code);
767}
768
769static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
770 const char *page, size_t len)
771{
772 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
773 int ret;
774 u8 b_vendor_code;
775
776 mutex_lock(&gi->lock);
777 ret = kstrtou8(page, 0, &b_vendor_code);
778 if (!ret) {
779 gi->b_vendor_code = b_vendor_code;
780 ret = len;
781 }
782 mutex_unlock(&gi->lock);
783
784 return ret;
785}
786
787static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
788{
789 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
790
791 memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
792 return OS_STRING_QW_SIGN_LEN;
793}
794
795static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
796 size_t len)
797{
798 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
799 int res, l;
800
801 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
802 if (page[l - 1] == '\n')
803 --l;
804
805 mutex_lock(&gi->lock);
806 res = utf8s_to_utf16s(page, l,
807 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
808 OS_STRING_QW_SIGN_LEN);
809 if (res > 0)
810 res = len;
811 mutex_unlock(&gi->lock);
812
813 return res;
814}
815
816CONFIGFS_ATTR(os_desc_, use);
817CONFIGFS_ATTR(os_desc_, b_vendor_code);
818CONFIGFS_ATTR(os_desc_, qw_sign);
819
820static struct configfs_attribute *os_desc_attrs[] = {
821 &os_desc_attr_use,
822 &os_desc_attr_b_vendor_code,
823 &os_desc_attr_qw_sign,
824 NULL,
825};
826
827static void os_desc_attr_release(struct config_item *item)
828{
829 struct os_desc *os_desc = to_os_desc(item);
830 kfree(os_desc);
831}
832
833static int os_desc_link(struct config_item *os_desc_ci,
834 struct config_item *usb_cfg_ci)
835{
836 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
837 struct gadget_info, os_desc_group);
838 struct usb_composite_dev *cdev = &gi->cdev;
839 struct config_usb_cfg *c_target =
840 container_of(to_config_group(usb_cfg_ci),
841 struct config_usb_cfg, group);
842 struct usb_configuration *c;
843 int ret;
844
845 mutex_lock(&gi->lock);
846 list_for_each_entry(c, &cdev->configs, list) {
847 if (c == &c_target->c)
848 break;
849 }
850 if (c != &c_target->c) {
851 ret = -EINVAL;
852 goto out;
853 }
854
855 if (cdev->os_desc_config) {
856 ret = -EBUSY;
857 goto out;
858 }
859
860 cdev->os_desc_config = &c_target->c;
861 ret = 0;
862
863out:
864 mutex_unlock(&gi->lock);
865 return ret;
866}
867
868static int os_desc_unlink(struct config_item *os_desc_ci,
869 struct config_item *usb_cfg_ci)
870{
871 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
872 struct gadget_info, os_desc_group);
873 struct usb_composite_dev *cdev = &gi->cdev;
874
875 mutex_lock(&gi->lock);
876 if (gi->composite.gadget_driver.udc_name)
877 unregister_gadget(gi);
878 cdev->os_desc_config = NULL;
879 WARN_ON(gi->composite.gadget_driver.udc_name);
880 mutex_unlock(&gi->lock);
881 return 0;
882}
883
884static struct configfs_item_operations os_desc_ops = {
885 .release = os_desc_attr_release,
886 .allow_link = os_desc_link,
887 .drop_link = os_desc_unlink,
888};
889
890static struct config_item_type os_desc_type = {
891 .ct_item_ops = &os_desc_ops,
892 .ct_attrs = os_desc_attrs,
893 .ct_owner = THIS_MODULE,
894};
895
896static inline struct usb_os_desc_ext_prop
897*to_usb_os_desc_ext_prop(struct config_item *item)
898{
899 return container_of(item, struct usb_os_desc_ext_prop, item);
900}
901
902static ssize_t ext_prop_type_show(struct config_item *item, char *page)
903{
904 return sprintf(page, "%d", to_usb_os_desc_ext_prop(item)->type);
905}
906
907static ssize_t ext_prop_type_store(struct config_item *item,
908 const char *page, size_t len)
909{
910 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
911 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
912 u8 type;
913 int ret;
914
915 if (desc->opts_mutex)
916 mutex_lock(desc->opts_mutex);
917 ret = kstrtou8(page, 0, &type);
918 if (ret)
919 goto end;
920 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
921 ret = -EINVAL;
922 goto end;
923 }
924
925 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
926 ext_prop->type == USB_EXT_PROP_LE32 ||
927 ext_prop->type == USB_EXT_PROP_BE32) &&
928 (type == USB_EXT_PROP_UNICODE ||
929 type == USB_EXT_PROP_UNICODE_ENV ||
930 type == USB_EXT_PROP_UNICODE_LINK))
931 ext_prop->data_len <<= 1;
932 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
933 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
934 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
935 (type == USB_EXT_PROP_BINARY ||
936 type == USB_EXT_PROP_LE32 ||
937 type == USB_EXT_PROP_BE32))
938 ext_prop->data_len >>= 1;
939 ext_prop->type = type;
940 ret = len;
941
942end:
943 if (desc->opts_mutex)
944 mutex_unlock(desc->opts_mutex);
945 return ret;
946}
947
948static ssize_t ext_prop_data_show(struct config_item *item, char *page)
949{
950 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
951 int len = ext_prop->data_len;
952
953 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
954 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
955 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
956 len >>= 1;
957 memcpy(page, ext_prop->data, len);
958
959 return len;
960}
961
962static ssize_t ext_prop_data_store(struct config_item *item,
963 const char *page, size_t len)
964{
965 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
966 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
967 char *new_data;
968 size_t ret_len = len;
969
970 if (page[len - 1] == '\n' || page[len - 1] == '\0')
971 --len;
972 new_data = kmemdup(page, len, GFP_KERNEL);
973 if (!new_data)
974 return -ENOMEM;
975
976 if (desc->opts_mutex)
977 mutex_lock(desc->opts_mutex);
978 kfree(ext_prop->data);
979 ext_prop->data = new_data;
980 desc->ext_prop_len -= ext_prop->data_len;
981 ext_prop->data_len = len;
982 desc->ext_prop_len += ext_prop->data_len;
983 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
984 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
985 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
986 desc->ext_prop_len -= ext_prop->data_len;
987 ext_prop->data_len <<= 1;
988 ext_prop->data_len += 2;
989 desc->ext_prop_len += ext_prop->data_len;
990 }
991 if (desc->opts_mutex)
992 mutex_unlock(desc->opts_mutex);
993 return ret_len;
994}
995
996CONFIGFS_ATTR(ext_prop_, type);
997CONFIGFS_ATTR(ext_prop_, data);
998
999static struct configfs_attribute *ext_prop_attrs[] = {
1000 &ext_prop_attr_type,
1001 &ext_prop_attr_data,
1002 NULL,
1003};
1004
1005static void usb_os_desc_ext_prop_release(struct config_item *item)
1006{
1007 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1008
1009 kfree(ext_prop); /* frees a whole chunk */
1010}
1011
1012static struct configfs_item_operations ext_prop_ops = {
1013 .release = usb_os_desc_ext_prop_release,
1014};
1015
1016static struct config_item *ext_prop_make(
1017 struct config_group *group,
1018 const char *name)
1019{
1020 struct usb_os_desc_ext_prop *ext_prop;
1021 struct config_item_type *ext_prop_type;
1022 struct usb_os_desc *desc;
1023 char *vlabuf;
1024
1025 vla_group(data_chunk);
1026 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1027 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1028
1029 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1030 if (!vlabuf)
1031 return ERR_PTR(-ENOMEM);
1032
1033 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1034 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1035
1036 desc = container_of(group, struct usb_os_desc, group);
1037 ext_prop_type->ct_item_ops = &ext_prop_ops;
1038 ext_prop_type->ct_attrs = ext_prop_attrs;
1039 ext_prop_type->ct_owner = desc->owner;
1040
1041 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1042
1043 ext_prop->name = kstrdup(name, GFP_KERNEL);
1044 if (!ext_prop->name) {
1045 kfree(vlabuf);
1046 return ERR_PTR(-ENOMEM);
1047 }
1048 desc->ext_prop_len += 14;
1049 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1050 if (desc->opts_mutex)
1051 mutex_lock(desc->opts_mutex);
1052 desc->ext_prop_len += ext_prop->name_len;
1053 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1054 ++desc->ext_prop_count;
1055 if (desc->opts_mutex)
1056 mutex_unlock(desc->opts_mutex);
1057
1058 return &ext_prop->item;
1059}
1060
1061static void ext_prop_drop(struct config_group *group, struct config_item *item)
1062{
1063 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1064 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1065
1066 if (desc->opts_mutex)
1067 mutex_lock(desc->opts_mutex);
1068 list_del(&ext_prop->entry);
1069 --desc->ext_prop_count;
1070 kfree(ext_prop->name);
1071 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1072 if (desc->opts_mutex)
1073 mutex_unlock(desc->opts_mutex);
1074 config_item_put(item);
1075}
1076
1077static struct configfs_group_operations interf_grp_ops = {
1078 .make_item = &ext_prop_make,
1079 .drop_item = &ext_prop_drop,
1080};
1081
1082static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1083 char *page)
1084{
1085 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1086 return 8;
1087}
1088
1089static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1090 const char *page, size_t len)
1091{
1092 struct usb_os_desc *desc = to_usb_os_desc(item);
1093 int l;
1094
1095 l = min_t(int, 8, len);
1096 if (page[l - 1] == '\n')
1097 --l;
1098 if (desc->opts_mutex)
1099 mutex_lock(desc->opts_mutex);
1100 memcpy(desc->ext_compat_id, page, l);
1101
1102 if (desc->opts_mutex)
1103 mutex_unlock(desc->opts_mutex);
1104
1105 return len;
1106}
1107
1108static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1109 char *page)
1110{
1111 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1112 return 8;
1113}
1114
1115static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1116 const char *page, size_t len)
1117{
1118 struct usb_os_desc *desc = to_usb_os_desc(item);
1119 int l;
1120
1121 l = min_t(int, 8, len);
1122 if (page[l - 1] == '\n')
1123 --l;
1124 if (desc->opts_mutex)
1125 mutex_lock(desc->opts_mutex);
1126 memcpy(desc->ext_compat_id + 8, page, l);
1127
1128 if (desc->opts_mutex)
1129 mutex_unlock(desc->opts_mutex);
1130
1131 return len;
1132}
1133
1134CONFIGFS_ATTR(interf_grp_, compatible_id);
1135CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1136
1137static struct configfs_attribute *interf_grp_attrs[] = {
1138 &interf_grp_attr_compatible_id,
1139 &interf_grp_attr_sub_compatible_id,
1140 NULL
1141};
1142
1143int usb_os_desc_prepare_interf_dir(struct config_group *parent,
1144 int n_interf,
1145 struct usb_os_desc **desc,
1146 char **names,
1147 struct module *owner)
1148{
1149 struct config_group *os_desc_group;
1150 struct config_item_type *os_desc_type, *interface_type;
1151
1152 vla_group(data_chunk);
1153 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1154 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1155 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1156
1157 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1158 if (!vlabuf)
1159 return -ENOMEM;
1160
1161 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1162 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1163 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1164
1165 os_desc_type->ct_owner = owner;
1166 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1167 configfs_add_default_group(os_desc_group, parent);
1168
1169 interface_type->ct_group_ops = &interf_grp_ops;
1170 interface_type->ct_attrs = interf_grp_attrs;
1171 interface_type->ct_owner = owner;
1172
1173 while (n_interf--) {
1174 struct usb_os_desc *d;
1175
1176 d = desc[n_interf];
1177 d->owner = owner;
1178 config_group_init_type_name(&d->group, "", interface_type);
1179 config_item_set_name(&d->group.cg_item, "interface.%s",
1180 names[n_interf]);
1181 configfs_add_default_group(&d->group, os_desc_group);
1182 }
1183
1184 return 0;
1185}
1186EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1187
1188static int configfs_do_nothing(struct usb_composite_dev *cdev)
1189{
1190 WARN_ON(1);
1191 return -EINVAL;
1192}
1193
1194int composite_dev_prepare(struct usb_composite_driver *composite,
1195 struct usb_composite_dev *dev);
1196
1197int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1198 struct usb_ep *ep0);
1199
1200static void purge_configs_funcs(struct gadget_info *gi)
1201{
1202 struct usb_configuration *c;
1203
1204 list_for_each_entry(c, &gi->cdev.configs, list) {
1205 struct usb_function *f, *tmp;
1206 struct config_usb_cfg *cfg;
1207
1208 cfg = container_of(c, struct config_usb_cfg, c);
1209
1210 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1211
1212 list_move_tail(&f->list, &cfg->func_list);
1213 if (f->unbind) {
1214 dev_err(&gi->cdev.gadget->dev, "unbind function"
1215 " '%s'/%p\n", f->name, f);
1216 f->unbind(c, f);
1217 }
1218 }
1219 c->next_interface_id = 0;
1220 memset(c->interface, 0, sizeof(c->interface));
1221 c->superspeed_plus = 0;
1222 c->superspeed = 0;
1223 c->highspeed = 0;
1224 c->fullspeed = 0;
1225 }
1226}
1227
1228static int configfs_composite_bind(struct usb_gadget *gadget,
1229 struct usb_gadget_driver *gdriver)
1230{
1231 struct usb_composite_driver *composite = to_cdriver(gdriver);
1232 struct gadget_info *gi = container_of(composite,
1233 struct gadget_info, composite);
1234 struct usb_composite_dev *cdev = &gi->cdev;
1235 struct usb_configuration *c;
1236 struct usb_string *s;
1237 unsigned i;
1238 int ret;
1239
1240 /* the gi->lock is hold by the caller */
1241 cdev->gadget = gadget;
1242 set_gadget_data(gadget, cdev);
1243 ret = composite_dev_prepare(composite, cdev);
1244 if (ret)
1245 return ret;
1246 /* and now the gadget bind */
1247 ret = -EINVAL;
1248
1249 if (list_empty(&gi->cdev.configs)) {
1250 pr_err("Need at least one configuration in %s.\n",
1251 gi->composite.name);
1252 goto err_comp_cleanup;
1253 }
1254
1255
1256 list_for_each_entry(c, &gi->cdev.configs, list) {
1257 struct config_usb_cfg *cfg;
1258
1259 cfg = container_of(c, struct config_usb_cfg, c);
1260 if (list_empty(&cfg->func_list)) {
1261 pr_err("Config %s/%d of %s needs at least one function.\n",
1262 c->label, c->bConfigurationValue,
1263 gi->composite.name);
1264 goto err_comp_cleanup;
1265 }
1266 }
1267
1268 /* init all strings */
1269 if (!list_empty(&gi->string_list)) {
1270 struct gadget_strings *gs;
1271
1272 i = 0;
1273 list_for_each_entry(gs, &gi->string_list, list) {
1274
1275 gi->gstrings[i] = &gs->stringtab_dev;
1276 gs->stringtab_dev.strings = gs->strings;
1277 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1278 gs->manufacturer;
1279 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1280 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1281 i++;
1282 }
1283 gi->gstrings[i] = NULL;
1284 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1285 USB_GADGET_FIRST_AVAIL_IDX);
1286 if (IS_ERR(s)) {
1287 ret = PTR_ERR(s);
1288 goto err_comp_cleanup;
1289 }
1290
1291 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1292 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1293 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1294 }
1295
1296 if (gi->use_os_desc) {
1297 cdev->use_os_string = true;
1298 cdev->b_vendor_code = gi->b_vendor_code;
1299 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1300 }
1301
1302 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1303 struct usb_descriptor_header *usb_desc;
1304
1305 usb_desc = usb_otg_descriptor_alloc(gadget);
1306 if (!usb_desc) {
1307 ret = -ENOMEM;
1308 goto err_comp_cleanup;
1309 }
1310 usb_otg_descriptor_init(gadget, usb_desc);
1311 otg_desc[0] = usb_desc;
1312 otg_desc[1] = NULL;
1313 }
1314
1315 /* Go through all configs, attach all functions */
1316 list_for_each_entry(c, &gi->cdev.configs, list) {
1317 struct config_usb_cfg *cfg;
1318 struct usb_function *f;
1319 struct usb_function *tmp;
1320 struct gadget_config_name *cn;
1321
1322 if (gadget_is_otg(gadget))
1323 c->descriptors = otg_desc;
1324
1325 cfg = container_of(c, struct config_usb_cfg, c);
1326 if (!list_empty(&cfg->string_list)) {
1327 i = 0;
1328 list_for_each_entry(cn, &cfg->string_list, list) {
1329 cfg->gstrings[i] = &cn->stringtab_dev;
1330 cn->stringtab_dev.strings = &cn->strings;
1331 cn->strings.s = cn->configuration;
1332 i++;
1333 }
1334 cfg->gstrings[i] = NULL;
1335 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1336 if (IS_ERR(s)) {
1337 ret = PTR_ERR(s);
1338 goto err_comp_cleanup;
1339 }
1340 c->iConfiguration = s[0].id;
1341 }
1342
1343 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1344 list_del(&f->list);
1345 ret = usb_add_function(c, f);
1346 if (ret) {
1347 list_add(&f->list, &cfg->func_list);
1348 goto err_purge_funcs;
1349 }
1350 }
1351 usb_ep_autoconfig_reset(cdev->gadget);
1352 }
1353 if (cdev->use_os_string) {
1354 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1355 if (ret)
1356 goto err_purge_funcs;
1357 }
1358
1359 usb_ep_autoconfig_reset(cdev->gadget);
1360 return 0;
1361
1362err_purge_funcs:
1363 purge_configs_funcs(gi);
1364err_comp_cleanup:
1365 composite_dev_cleanup(cdev);
1366 return ret;
1367}
1368
1369static void configfs_composite_unbind(struct usb_gadget *gadget)
1370{
1371 struct usb_composite_dev *cdev;
1372 struct gadget_info *gi;
1373
1374 /* the gi->lock is hold by the caller */
1375
1376 cdev = get_gadget_data(gadget);
1377 gi = container_of(cdev, struct gadget_info, cdev);
1378
1379 kfree(otg_desc[0]);
1380 otg_desc[0] = NULL;
1381 purge_configs_funcs(gi);
1382 composite_dev_cleanup(cdev);
1383 usb_ep_autoconfig_reset(cdev->gadget);
1384 cdev->gadget = NULL;
1385 set_gadget_data(gadget, NULL);
1386}
1387
1388static const struct usb_gadget_driver configfs_driver_template = {
1389 .bind = configfs_composite_bind,
1390 .unbind = configfs_composite_unbind,
1391
1392 .setup = composite_setup,
1393 .reset = composite_disconnect,
1394 .disconnect = composite_disconnect,
1395
1396 .suspend = composite_suspend,
1397 .resume = composite_resume,
1398
1399 .max_speed = USB_SPEED_SUPER,
1400 .driver = {
1401 .owner = THIS_MODULE,
1402 .name = "configfs-gadget",
1403 },
1404};
1405
1406static struct config_group *gadgets_make(
1407 struct config_group *group,
1408 const char *name)
1409{
1410 struct gadget_info *gi;
1411
1412 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1413 if (!gi)
1414 return ERR_PTR(-ENOMEM);
1415
1416 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1417
1418 config_group_init_type_name(&gi->functions_group, "functions",
1419 &functions_type);
1420 configfs_add_default_group(&gi->functions_group, &gi->group);
1421
1422 config_group_init_type_name(&gi->configs_group, "configs",
1423 &config_desc_type);
1424 configfs_add_default_group(&gi->configs_group, &gi->group);
1425
1426 config_group_init_type_name(&gi->strings_group, "strings",
1427 &gadget_strings_strings_type);
1428 configfs_add_default_group(&gi->strings_group, &gi->group);
1429
1430 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1431 &os_desc_type);
1432 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1433
1434 gi->composite.bind = configfs_do_nothing;
1435 gi->composite.unbind = configfs_do_nothing;
1436 gi->composite.suspend = NULL;
1437 gi->composite.resume = NULL;
1438 gi->composite.max_speed = USB_SPEED_SUPER;
1439
1440 mutex_init(&gi->lock);
1441 INIT_LIST_HEAD(&gi->string_list);
1442 INIT_LIST_HEAD(&gi->available_func);
1443
1444 composite_init_dev(&gi->cdev);
1445 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1446 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1447 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1448
1449 gi->composite.gadget_driver = configfs_driver_template;
1450
1451 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1452 gi->composite.name = gi->composite.gadget_driver.function;
1453
1454 if (!gi->composite.gadget_driver.function)
1455 goto err;
1456
1457 return &gi->group;
1458err:
1459 kfree(gi);
1460 return ERR_PTR(-ENOMEM);
1461}
1462
1463static void gadgets_drop(struct config_group *group, struct config_item *item)
1464{
1465 config_item_put(item);
1466}
1467
1468static struct configfs_group_operations gadgets_ops = {
1469 .make_group = &gadgets_make,
1470 .drop_item = &gadgets_drop,
1471};
1472
1473static struct config_item_type gadgets_type = {
1474 .ct_group_ops = &gadgets_ops,
1475 .ct_owner = THIS_MODULE,
1476};
1477
1478static struct configfs_subsystem gadget_subsys = {
1479 .su_group = {
1480 .cg_item = {
1481 .ci_namebuf = "usb_gadget",
1482 .ci_type = &gadgets_type,
1483 },
1484 },
1485 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1486};
1487
1488void unregister_gadget_item(struct config_item *item)
1489{
1490 struct gadget_info *gi = to_gadget_info(item);
1491
1492 unregister_gadget(gi);
1493}
1494EXPORT_SYMBOL_GPL(unregister_gadget_item);
1495
1496static int __init gadget_cfs_init(void)
1497{
1498 int ret;
1499
1500 config_group_init(&gadget_subsys.su_group);
1501
1502 ret = configfs_register_subsystem(&gadget_subsys);
1503 return ret;
1504}
1505module_init(gadget_cfs_init);
1506
1507static void __exit gadget_cfs_exit(void)
1508{
1509 configfs_unregister_subsystem(&gadget_subsys);
1510}
1511module_exit(gadget_cfs_exit);
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 u16 num;
17 int ret;
18
19 ret = kstrtou16(name, 0, &num);
20 if (ret)
21 return ret;
22
23 if (!usb_validate_langid(num))
24 return -EINVAL;
25
26 stringtab_dev->language = num;
27 return 0;
28}
29
30#define MAX_NAME_LEN 40
31#define MAX_USB_STRING_LANGS 2
32
33static const struct usb_descriptor_header *otg_desc[2];
34
35struct gadget_info {
36 struct config_group group;
37 struct config_group functions_group;
38 struct config_group configs_group;
39 struct config_group strings_group;
40 struct config_group os_desc_group;
41
42 struct mutex lock;
43 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
44 struct list_head string_list;
45 struct list_head available_func;
46
47 struct usb_composite_driver composite;
48 struct usb_composite_dev cdev;
49 bool use_os_desc;
50 char b_vendor_code;
51 char qw_sign[OS_STRING_QW_SIGN_LEN];
52 spinlock_t spinlock;
53 bool unbind;
54};
55
56static inline struct gadget_info *to_gadget_info(struct config_item *item)
57{
58 return container_of(to_config_group(item), struct gadget_info, group);
59}
60
61struct config_usb_cfg {
62 struct config_group group;
63 struct config_group strings_group;
64 struct list_head string_list;
65 struct usb_configuration c;
66 struct list_head func_list;
67 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
68};
69
70static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
71{
72 return container_of(to_config_group(item), struct config_usb_cfg,
73 group);
74}
75
76struct gadget_strings {
77 struct usb_gadget_strings stringtab_dev;
78 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
79 char *manufacturer;
80 char *product;
81 char *serialnumber;
82
83 struct config_group group;
84 struct list_head list;
85};
86
87struct os_desc {
88 struct config_group group;
89};
90
91struct gadget_config_name {
92 struct usb_gadget_strings stringtab_dev;
93 struct usb_string strings;
94 char *configuration;
95
96 struct config_group group;
97 struct list_head list;
98};
99
100#define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1)
101
102static int usb_string_copy(const char *s, char **s_copy)
103{
104 int ret;
105 char *str;
106 char *copy = *s_copy;
107 ret = strlen(s);
108 if (ret > USB_MAX_STRING_LEN)
109 return -EOVERFLOW;
110
111 if (copy) {
112 str = copy;
113 } else {
114 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
115 if (!str)
116 return -ENOMEM;
117 }
118 strcpy(str, s);
119 if (str[ret - 1] == '\n')
120 str[ret - 1] = '\0';
121 *s_copy = str;
122 return 0;
123}
124
125#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
126static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
127 char *page) \
128{ \
129 return sprintf(page, "0x%02x\n", \
130 to_gadget_info(item)->cdev.desc.__name); \
131}
132
133#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
134static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
135 char *page) \
136{ \
137 return sprintf(page, "0x%04x\n", \
138 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
139}
140
141
142#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
143static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
144 const char *page, size_t len) \
145{ \
146 u8 val; \
147 int ret; \
148 ret = kstrtou8(page, 0, &val); \
149 if (ret) \
150 return ret; \
151 to_gadget_info(item)->cdev.desc._name = val; \
152 return len; \
153}
154
155#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
156static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
157 const char *page, size_t len) \
158{ \
159 u16 val; \
160 int ret; \
161 ret = kstrtou16(page, 0, &val); \
162 if (ret) \
163 return ret; \
164 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
165 return len; \
166}
167
168#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
169 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
170 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
171
172GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
173GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
174GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
175GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
176GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
177GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
178GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
179GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
180
181static ssize_t is_valid_bcd(u16 bcd_val)
182{
183 if ((bcd_val & 0xf) > 9)
184 return -EINVAL;
185 if (((bcd_val >> 4) & 0xf) > 9)
186 return -EINVAL;
187 if (((bcd_val >> 8) & 0xf) > 9)
188 return -EINVAL;
189 if (((bcd_val >> 12) & 0xf) > 9)
190 return -EINVAL;
191 return 0;
192}
193
194static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
195 const char *page, size_t len)
196{
197 u16 bcdDevice;
198 int ret;
199
200 ret = kstrtou16(page, 0, &bcdDevice);
201 if (ret)
202 return ret;
203 ret = is_valid_bcd(bcdDevice);
204 if (ret)
205 return ret;
206
207 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
208 return len;
209}
210
211static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
212 const char *page, size_t len)
213{
214 u16 bcdUSB;
215 int ret;
216
217 ret = kstrtou16(page, 0, &bcdUSB);
218 if (ret)
219 return ret;
220 ret = is_valid_bcd(bcdUSB);
221 if (ret)
222 return ret;
223
224 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
225 return len;
226}
227
228static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
229{
230 struct gadget_info *gi = to_gadget_info(item);
231 char *udc_name;
232 int ret;
233
234 mutex_lock(&gi->lock);
235 udc_name = gi->composite.gadget_driver.udc_name;
236 ret = sprintf(page, "%s\n", udc_name ?: "");
237 mutex_unlock(&gi->lock);
238
239 return ret;
240}
241
242static int unregister_gadget(struct gadget_info *gi)
243{
244 int ret;
245
246 if (!gi->composite.gadget_driver.udc_name)
247 return -ENODEV;
248
249 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
250 if (ret)
251 return ret;
252 kfree(gi->composite.gadget_driver.udc_name);
253 gi->composite.gadget_driver.udc_name = NULL;
254 return 0;
255}
256
257static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
258 const char *page, size_t len)
259{
260 struct gadget_info *gi = to_gadget_info(item);
261 char *name;
262 int ret;
263
264 if (strlen(page) < len)
265 return -EOVERFLOW;
266
267 name = kstrdup(page, GFP_KERNEL);
268 if (!name)
269 return -ENOMEM;
270 if (name[len - 1] == '\n')
271 name[len - 1] = '\0';
272
273 mutex_lock(&gi->lock);
274
275 if (!strlen(name)) {
276 ret = unregister_gadget(gi);
277 if (ret)
278 goto err;
279 kfree(name);
280 } else {
281 if (gi->composite.gadget_driver.udc_name) {
282 ret = -EBUSY;
283 goto err;
284 }
285 gi->composite.gadget_driver.udc_name = name;
286 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
287 if (ret) {
288 gi->composite.gadget_driver.udc_name = NULL;
289 goto err;
290 }
291 }
292 mutex_unlock(&gi->lock);
293 return len;
294err:
295 kfree(name);
296 mutex_unlock(&gi->lock);
297 return ret;
298}
299
300static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
301 char *page)
302{
303 enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
304
305 return sprintf(page, "%s\n", usb_speed_string(speed));
306}
307
308static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
309 const char *page, size_t len)
310{
311 struct gadget_info *gi = to_gadget_info(item);
312
313 mutex_lock(&gi->lock);
314
315 /* Prevent changing of max_speed after the driver is binded */
316 if (gi->composite.gadget_driver.udc_name)
317 goto err;
318
319 if (strncmp(page, "super-speed-plus", 16) == 0)
320 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
321 else if (strncmp(page, "super-speed", 11) == 0)
322 gi->composite.max_speed = USB_SPEED_SUPER;
323 else if (strncmp(page, "high-speed", 10) == 0)
324 gi->composite.max_speed = USB_SPEED_HIGH;
325 else if (strncmp(page, "full-speed", 10) == 0)
326 gi->composite.max_speed = USB_SPEED_FULL;
327 else if (strncmp(page, "low-speed", 9) == 0)
328 gi->composite.max_speed = USB_SPEED_LOW;
329 else
330 goto err;
331
332 gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
333
334 mutex_unlock(&gi->lock);
335 return len;
336err:
337 mutex_unlock(&gi->lock);
338 return -EINVAL;
339}
340
341CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
342CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
343CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
344CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
345CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
346CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
347CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
348CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
349CONFIGFS_ATTR(gadget_dev_desc_, UDC);
350CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
351
352static struct configfs_attribute *gadget_root_attrs[] = {
353 &gadget_dev_desc_attr_bDeviceClass,
354 &gadget_dev_desc_attr_bDeviceSubClass,
355 &gadget_dev_desc_attr_bDeviceProtocol,
356 &gadget_dev_desc_attr_bMaxPacketSize0,
357 &gadget_dev_desc_attr_idVendor,
358 &gadget_dev_desc_attr_idProduct,
359 &gadget_dev_desc_attr_bcdDevice,
360 &gadget_dev_desc_attr_bcdUSB,
361 &gadget_dev_desc_attr_UDC,
362 &gadget_dev_desc_attr_max_speed,
363 NULL,
364};
365
366static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
367{
368 return container_of(to_config_group(item), struct gadget_strings,
369 group);
370}
371
372static inline struct gadget_config_name *to_gadget_config_name(
373 struct config_item *item)
374{
375 return container_of(to_config_group(item), struct gadget_config_name,
376 group);
377}
378
379static inline struct usb_function_instance *to_usb_function_instance(
380 struct config_item *item)
381{
382 return container_of(to_config_group(item),
383 struct usb_function_instance, group);
384}
385
386static void gadget_info_attr_release(struct config_item *item)
387{
388 struct gadget_info *gi = to_gadget_info(item);
389
390 WARN_ON(!list_empty(&gi->cdev.configs));
391 WARN_ON(!list_empty(&gi->string_list));
392 WARN_ON(!list_empty(&gi->available_func));
393 kfree(gi->composite.gadget_driver.function);
394 kfree(gi);
395}
396
397static struct configfs_item_operations gadget_root_item_ops = {
398 .release = gadget_info_attr_release,
399};
400
401static void gadget_config_attr_release(struct config_item *item)
402{
403 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
404
405 WARN_ON(!list_empty(&cfg->c.functions));
406 list_del(&cfg->c.list);
407 kfree(cfg->c.label);
408 kfree(cfg);
409}
410
411static int config_usb_cfg_link(
412 struct config_item *usb_cfg_ci,
413 struct config_item *usb_func_ci)
414{
415 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
416 struct usb_composite_dev *cdev = cfg->c.cdev;
417 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
418
419 struct config_group *group = to_config_group(usb_func_ci);
420 struct usb_function_instance *fi = container_of(group,
421 struct usb_function_instance, group);
422 struct usb_function_instance *a_fi;
423 struct usb_function *f;
424 int ret;
425
426 mutex_lock(&gi->lock);
427 /*
428 * Make sure this function is from within our _this_ gadget and not
429 * from another gadget or a random directory.
430 * Also a function instance can only be linked once.
431 */
432 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
433 if (a_fi == fi)
434 break;
435 }
436 if (a_fi != fi) {
437 ret = -EINVAL;
438 goto out;
439 }
440
441 list_for_each_entry(f, &cfg->func_list, list) {
442 if (f->fi == fi) {
443 ret = -EEXIST;
444 goto out;
445 }
446 }
447
448 f = usb_get_function(fi);
449 if (IS_ERR(f)) {
450 ret = PTR_ERR(f);
451 goto out;
452 }
453
454 /* stash the function until we bind it to the gadget */
455 list_add_tail(&f->list, &cfg->func_list);
456 ret = 0;
457out:
458 mutex_unlock(&gi->lock);
459 return ret;
460}
461
462static void config_usb_cfg_unlink(
463 struct config_item *usb_cfg_ci,
464 struct config_item *usb_func_ci)
465{
466 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
467 struct usb_composite_dev *cdev = cfg->c.cdev;
468 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
469
470 struct config_group *group = to_config_group(usb_func_ci);
471 struct usb_function_instance *fi = container_of(group,
472 struct usb_function_instance, group);
473 struct usb_function *f;
474
475 /*
476 * ideally I would like to forbid to unlink functions while a gadget is
477 * bound to an UDC. Since this isn't possible at the moment, we simply
478 * force an unbind, the function is available here and then we can
479 * remove the function.
480 */
481 mutex_lock(&gi->lock);
482 if (gi->composite.gadget_driver.udc_name)
483 unregister_gadget(gi);
484 WARN_ON(gi->composite.gadget_driver.udc_name);
485
486 list_for_each_entry(f, &cfg->func_list, list) {
487 if (f->fi == fi) {
488 list_del(&f->list);
489 usb_put_function(f);
490 mutex_unlock(&gi->lock);
491 return;
492 }
493 }
494 mutex_unlock(&gi->lock);
495 WARN(1, "Unable to locate function to unbind\n");
496}
497
498static struct configfs_item_operations gadget_config_item_ops = {
499 .release = gadget_config_attr_release,
500 .allow_link = config_usb_cfg_link,
501 .drop_link = config_usb_cfg_unlink,
502};
503
504
505static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
506 char *page)
507{
508 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
509}
510
511static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
512 const char *page, size_t len)
513{
514 u16 val;
515 int ret;
516 ret = kstrtou16(page, 0, &val);
517 if (ret)
518 return ret;
519 if (DIV_ROUND_UP(val, 8) > 0xff)
520 return -ERANGE;
521 to_config_usb_cfg(item)->c.MaxPower = val;
522 return len;
523}
524
525static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
526 char *page)
527{
528 return sprintf(page, "0x%02x\n",
529 to_config_usb_cfg(item)->c.bmAttributes);
530}
531
532static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
533 const char *page, size_t len)
534{
535 u8 val;
536 int ret;
537 ret = kstrtou8(page, 0, &val);
538 if (ret)
539 return ret;
540 if (!(val & USB_CONFIG_ATT_ONE))
541 return -EINVAL;
542 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
543 USB_CONFIG_ATT_WAKEUP))
544 return -EINVAL;
545 to_config_usb_cfg(item)->c.bmAttributes = val;
546 return len;
547}
548
549CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
550CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
551
552static struct configfs_attribute *gadget_config_attrs[] = {
553 &gadget_config_desc_attr_MaxPower,
554 &gadget_config_desc_attr_bmAttributes,
555 NULL,
556};
557
558static const struct config_item_type gadget_config_type = {
559 .ct_item_ops = &gadget_config_item_ops,
560 .ct_attrs = gadget_config_attrs,
561 .ct_owner = THIS_MODULE,
562};
563
564static const struct config_item_type gadget_root_type = {
565 .ct_item_ops = &gadget_root_item_ops,
566 .ct_attrs = gadget_root_attrs,
567 .ct_owner = THIS_MODULE,
568};
569
570static void composite_init_dev(struct usb_composite_dev *cdev)
571{
572 spin_lock_init(&cdev->lock);
573 INIT_LIST_HEAD(&cdev->configs);
574 INIT_LIST_HEAD(&cdev->gstrings);
575}
576
577static struct config_group *function_make(
578 struct config_group *group,
579 const char *name)
580{
581 struct gadget_info *gi;
582 struct usb_function_instance *fi;
583 char buf[MAX_NAME_LEN];
584 char *func_name;
585 char *instance_name;
586 int ret;
587
588 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
589 if (ret >= MAX_NAME_LEN)
590 return ERR_PTR(-ENAMETOOLONG);
591
592 func_name = buf;
593 instance_name = strchr(func_name, '.');
594 if (!instance_name) {
595 pr_err("Unable to locate . in FUNC.INSTANCE\n");
596 return ERR_PTR(-EINVAL);
597 }
598 *instance_name = '\0';
599 instance_name++;
600
601 fi = usb_get_function_instance(func_name);
602 if (IS_ERR(fi))
603 return ERR_CAST(fi);
604
605 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
606 if (ret) {
607 usb_put_function_instance(fi);
608 return ERR_PTR(ret);
609 }
610 if (fi->set_inst_name) {
611 ret = fi->set_inst_name(fi, instance_name);
612 if (ret) {
613 usb_put_function_instance(fi);
614 return ERR_PTR(ret);
615 }
616 }
617
618 gi = container_of(group, struct gadget_info, functions_group);
619
620 mutex_lock(&gi->lock);
621 list_add_tail(&fi->cfs_list, &gi->available_func);
622 mutex_unlock(&gi->lock);
623 return &fi->group;
624}
625
626static void function_drop(
627 struct config_group *group,
628 struct config_item *item)
629{
630 struct usb_function_instance *fi = to_usb_function_instance(item);
631 struct gadget_info *gi;
632
633 gi = container_of(group, struct gadget_info, functions_group);
634
635 mutex_lock(&gi->lock);
636 list_del(&fi->cfs_list);
637 mutex_unlock(&gi->lock);
638 config_item_put(item);
639}
640
641static struct configfs_group_operations functions_ops = {
642 .make_group = &function_make,
643 .drop_item = &function_drop,
644};
645
646static const struct config_item_type functions_type = {
647 .ct_group_ops = &functions_ops,
648 .ct_owner = THIS_MODULE,
649};
650
651GS_STRINGS_RW(gadget_config_name, configuration);
652
653static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
654 &gadget_config_name_attr_configuration,
655 NULL,
656};
657
658static void gadget_config_name_attr_release(struct config_item *item)
659{
660 struct gadget_config_name *cn = to_gadget_config_name(item);
661
662 kfree(cn->configuration);
663
664 list_del(&cn->list);
665 kfree(cn);
666}
667
668USB_CONFIG_STRING_RW_OPS(gadget_config_name);
669USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
670
671static struct config_group *config_desc_make(
672 struct config_group *group,
673 const char *name)
674{
675 struct gadget_info *gi;
676 struct config_usb_cfg *cfg;
677 char buf[MAX_NAME_LEN];
678 char *num_str;
679 u8 num;
680 int ret;
681
682 gi = container_of(group, struct gadget_info, configs_group);
683 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
684 if (ret >= MAX_NAME_LEN)
685 return ERR_PTR(-ENAMETOOLONG);
686
687 num_str = strchr(buf, '.');
688 if (!num_str) {
689 pr_err("Unable to locate . in name.bConfigurationValue\n");
690 return ERR_PTR(-EINVAL);
691 }
692
693 *num_str = '\0';
694 num_str++;
695
696 if (!strlen(buf))
697 return ERR_PTR(-EINVAL);
698
699 ret = kstrtou8(num_str, 0, &num);
700 if (ret)
701 return ERR_PTR(ret);
702
703 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
704 if (!cfg)
705 return ERR_PTR(-ENOMEM);
706 cfg->c.label = kstrdup(buf, GFP_KERNEL);
707 if (!cfg->c.label) {
708 ret = -ENOMEM;
709 goto err;
710 }
711 cfg->c.bConfigurationValue = num;
712 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
713 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
714 INIT_LIST_HEAD(&cfg->string_list);
715 INIT_LIST_HEAD(&cfg->func_list);
716
717 config_group_init_type_name(&cfg->group, name,
718 &gadget_config_type);
719
720 config_group_init_type_name(&cfg->strings_group, "strings",
721 &gadget_config_name_strings_type);
722 configfs_add_default_group(&cfg->strings_group, &cfg->group);
723
724 ret = usb_add_config_only(&gi->cdev, &cfg->c);
725 if (ret)
726 goto err;
727
728 return &cfg->group;
729err:
730 kfree(cfg->c.label);
731 kfree(cfg);
732 return ERR_PTR(ret);
733}
734
735static void config_desc_drop(
736 struct config_group *group,
737 struct config_item *item)
738{
739 config_item_put(item);
740}
741
742static struct configfs_group_operations config_desc_ops = {
743 .make_group = &config_desc_make,
744 .drop_item = &config_desc_drop,
745};
746
747static const struct config_item_type config_desc_type = {
748 .ct_group_ops = &config_desc_ops,
749 .ct_owner = THIS_MODULE,
750};
751
752GS_STRINGS_RW(gadget_strings, manufacturer);
753GS_STRINGS_RW(gadget_strings, product);
754GS_STRINGS_RW(gadget_strings, serialnumber);
755
756static struct configfs_attribute *gadget_strings_langid_attrs[] = {
757 &gadget_strings_attr_manufacturer,
758 &gadget_strings_attr_product,
759 &gadget_strings_attr_serialnumber,
760 NULL,
761};
762
763static void gadget_strings_attr_release(struct config_item *item)
764{
765 struct gadget_strings *gs = to_gadget_strings(item);
766
767 kfree(gs->manufacturer);
768 kfree(gs->product);
769 kfree(gs->serialnumber);
770
771 list_del(&gs->list);
772 kfree(gs);
773}
774
775USB_CONFIG_STRING_RW_OPS(gadget_strings);
776USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
777
778static inline struct os_desc *to_os_desc(struct config_item *item)
779{
780 return container_of(to_config_group(item), struct os_desc, group);
781}
782
783static inline struct gadget_info *os_desc_item_to_gadget_info(
784 struct config_item *item)
785{
786 return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
787}
788
789static ssize_t os_desc_use_show(struct config_item *item, char *page)
790{
791 return sprintf(page, "%d\n",
792 os_desc_item_to_gadget_info(item)->use_os_desc);
793}
794
795static ssize_t os_desc_use_store(struct config_item *item, const char *page,
796 size_t len)
797{
798 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
799 int ret;
800 bool use;
801
802 mutex_lock(&gi->lock);
803 ret = strtobool(page, &use);
804 if (!ret) {
805 gi->use_os_desc = use;
806 ret = len;
807 }
808 mutex_unlock(&gi->lock);
809
810 return ret;
811}
812
813static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
814{
815 return sprintf(page, "0x%02x\n",
816 os_desc_item_to_gadget_info(item)->b_vendor_code);
817}
818
819static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
820 const char *page, size_t len)
821{
822 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
823 int ret;
824 u8 b_vendor_code;
825
826 mutex_lock(&gi->lock);
827 ret = kstrtou8(page, 0, &b_vendor_code);
828 if (!ret) {
829 gi->b_vendor_code = b_vendor_code;
830 ret = len;
831 }
832 mutex_unlock(&gi->lock);
833
834 return ret;
835}
836
837static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
838{
839 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
840 int res;
841
842 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
843 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
844 page[res++] = '\n';
845
846 return res;
847}
848
849static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
850 size_t len)
851{
852 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
853 int res, l;
854
855 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
856 if (page[l - 1] == '\n')
857 --l;
858
859 mutex_lock(&gi->lock);
860 res = utf8s_to_utf16s(page, l,
861 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
862 OS_STRING_QW_SIGN_LEN);
863 if (res > 0)
864 res = len;
865 mutex_unlock(&gi->lock);
866
867 return res;
868}
869
870CONFIGFS_ATTR(os_desc_, use);
871CONFIGFS_ATTR(os_desc_, b_vendor_code);
872CONFIGFS_ATTR(os_desc_, qw_sign);
873
874static struct configfs_attribute *os_desc_attrs[] = {
875 &os_desc_attr_use,
876 &os_desc_attr_b_vendor_code,
877 &os_desc_attr_qw_sign,
878 NULL,
879};
880
881static void os_desc_attr_release(struct config_item *item)
882{
883 struct os_desc *os_desc = to_os_desc(item);
884 kfree(os_desc);
885}
886
887static int os_desc_link(struct config_item *os_desc_ci,
888 struct config_item *usb_cfg_ci)
889{
890 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
891 struct gadget_info, os_desc_group);
892 struct usb_composite_dev *cdev = &gi->cdev;
893 struct config_usb_cfg *c_target =
894 container_of(to_config_group(usb_cfg_ci),
895 struct config_usb_cfg, group);
896 struct usb_configuration *c;
897 int ret;
898
899 mutex_lock(&gi->lock);
900 list_for_each_entry(c, &cdev->configs, list) {
901 if (c == &c_target->c)
902 break;
903 }
904 if (c != &c_target->c) {
905 ret = -EINVAL;
906 goto out;
907 }
908
909 if (cdev->os_desc_config) {
910 ret = -EBUSY;
911 goto out;
912 }
913
914 cdev->os_desc_config = &c_target->c;
915 ret = 0;
916
917out:
918 mutex_unlock(&gi->lock);
919 return ret;
920}
921
922static void os_desc_unlink(struct config_item *os_desc_ci,
923 struct config_item *usb_cfg_ci)
924{
925 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
926 struct gadget_info, os_desc_group);
927 struct usb_composite_dev *cdev = &gi->cdev;
928
929 mutex_lock(&gi->lock);
930 if (gi->composite.gadget_driver.udc_name)
931 unregister_gadget(gi);
932 cdev->os_desc_config = NULL;
933 WARN_ON(gi->composite.gadget_driver.udc_name);
934 mutex_unlock(&gi->lock);
935}
936
937static struct configfs_item_operations os_desc_ops = {
938 .release = os_desc_attr_release,
939 .allow_link = os_desc_link,
940 .drop_link = os_desc_unlink,
941};
942
943static struct config_item_type os_desc_type = {
944 .ct_item_ops = &os_desc_ops,
945 .ct_attrs = os_desc_attrs,
946 .ct_owner = THIS_MODULE,
947};
948
949static inline struct usb_os_desc_ext_prop
950*to_usb_os_desc_ext_prop(struct config_item *item)
951{
952 return container_of(item, struct usb_os_desc_ext_prop, item);
953}
954
955static ssize_t ext_prop_type_show(struct config_item *item, char *page)
956{
957 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
958}
959
960static ssize_t ext_prop_type_store(struct config_item *item,
961 const char *page, size_t len)
962{
963 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
964 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
965 u8 type;
966 int ret;
967
968 if (desc->opts_mutex)
969 mutex_lock(desc->opts_mutex);
970 ret = kstrtou8(page, 0, &type);
971 if (ret)
972 goto end;
973 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
974 ret = -EINVAL;
975 goto end;
976 }
977
978 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
979 ext_prop->type == USB_EXT_PROP_LE32 ||
980 ext_prop->type == USB_EXT_PROP_BE32) &&
981 (type == USB_EXT_PROP_UNICODE ||
982 type == USB_EXT_PROP_UNICODE_ENV ||
983 type == USB_EXT_PROP_UNICODE_LINK))
984 ext_prop->data_len <<= 1;
985 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
986 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
987 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
988 (type == USB_EXT_PROP_BINARY ||
989 type == USB_EXT_PROP_LE32 ||
990 type == USB_EXT_PROP_BE32))
991 ext_prop->data_len >>= 1;
992 ext_prop->type = type;
993 ret = len;
994
995end:
996 if (desc->opts_mutex)
997 mutex_unlock(desc->opts_mutex);
998 return ret;
999}
1000
1001static ssize_t ext_prop_data_show(struct config_item *item, char *page)
1002{
1003 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1004 int len = ext_prop->data_len;
1005
1006 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1007 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1008 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1009 len >>= 1;
1010 memcpy(page, ext_prop->data, len);
1011
1012 return len;
1013}
1014
1015static ssize_t ext_prop_data_store(struct config_item *item,
1016 const char *page, size_t len)
1017{
1018 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1019 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1020 char *new_data;
1021 size_t ret_len = len;
1022
1023 if (page[len - 1] == '\n' || page[len - 1] == '\0')
1024 --len;
1025 new_data = kmemdup(page, len, GFP_KERNEL);
1026 if (!new_data)
1027 return -ENOMEM;
1028
1029 if (desc->opts_mutex)
1030 mutex_lock(desc->opts_mutex);
1031 kfree(ext_prop->data);
1032 ext_prop->data = new_data;
1033 desc->ext_prop_len -= ext_prop->data_len;
1034 ext_prop->data_len = len;
1035 desc->ext_prop_len += ext_prop->data_len;
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 desc->ext_prop_len -= ext_prop->data_len;
1040 ext_prop->data_len <<= 1;
1041 ext_prop->data_len += 2;
1042 desc->ext_prop_len += ext_prop->data_len;
1043 }
1044 if (desc->opts_mutex)
1045 mutex_unlock(desc->opts_mutex);
1046 return ret_len;
1047}
1048
1049CONFIGFS_ATTR(ext_prop_, type);
1050CONFIGFS_ATTR(ext_prop_, data);
1051
1052static struct configfs_attribute *ext_prop_attrs[] = {
1053 &ext_prop_attr_type,
1054 &ext_prop_attr_data,
1055 NULL,
1056};
1057
1058static void usb_os_desc_ext_prop_release(struct config_item *item)
1059{
1060 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1061
1062 kfree(ext_prop); /* frees a whole chunk */
1063}
1064
1065static struct configfs_item_operations ext_prop_ops = {
1066 .release = usb_os_desc_ext_prop_release,
1067};
1068
1069static struct config_item *ext_prop_make(
1070 struct config_group *group,
1071 const char *name)
1072{
1073 struct usb_os_desc_ext_prop *ext_prop;
1074 struct config_item_type *ext_prop_type;
1075 struct usb_os_desc *desc;
1076 char *vlabuf;
1077
1078 vla_group(data_chunk);
1079 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1080 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1081
1082 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1083 if (!vlabuf)
1084 return ERR_PTR(-ENOMEM);
1085
1086 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1087 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1088
1089 desc = container_of(group, struct usb_os_desc, group);
1090 ext_prop_type->ct_item_ops = &ext_prop_ops;
1091 ext_prop_type->ct_attrs = ext_prop_attrs;
1092 ext_prop_type->ct_owner = desc->owner;
1093
1094 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1095
1096 ext_prop->name = kstrdup(name, GFP_KERNEL);
1097 if (!ext_prop->name) {
1098 kfree(vlabuf);
1099 return ERR_PTR(-ENOMEM);
1100 }
1101 desc->ext_prop_len += 14;
1102 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1103 if (desc->opts_mutex)
1104 mutex_lock(desc->opts_mutex);
1105 desc->ext_prop_len += ext_prop->name_len;
1106 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1107 ++desc->ext_prop_count;
1108 if (desc->opts_mutex)
1109 mutex_unlock(desc->opts_mutex);
1110
1111 return &ext_prop->item;
1112}
1113
1114static void ext_prop_drop(struct config_group *group, struct config_item *item)
1115{
1116 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1117 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1118
1119 if (desc->opts_mutex)
1120 mutex_lock(desc->opts_mutex);
1121 list_del(&ext_prop->entry);
1122 --desc->ext_prop_count;
1123 kfree(ext_prop->name);
1124 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1125 if (desc->opts_mutex)
1126 mutex_unlock(desc->opts_mutex);
1127 config_item_put(item);
1128}
1129
1130static struct configfs_group_operations interf_grp_ops = {
1131 .make_item = &ext_prop_make,
1132 .drop_item = &ext_prop_drop,
1133};
1134
1135static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1136 char *page)
1137{
1138 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1139 return 8;
1140}
1141
1142static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1143 const char *page, size_t len)
1144{
1145 struct usb_os_desc *desc = to_usb_os_desc(item);
1146 int l;
1147
1148 l = min_t(int, 8, len);
1149 if (page[l - 1] == '\n')
1150 --l;
1151 if (desc->opts_mutex)
1152 mutex_lock(desc->opts_mutex);
1153 memcpy(desc->ext_compat_id, page, l);
1154
1155 if (desc->opts_mutex)
1156 mutex_unlock(desc->opts_mutex);
1157
1158 return len;
1159}
1160
1161static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1162 char *page)
1163{
1164 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1165 return 8;
1166}
1167
1168static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1169 const char *page, size_t len)
1170{
1171 struct usb_os_desc *desc = to_usb_os_desc(item);
1172 int l;
1173
1174 l = min_t(int, 8, len);
1175 if (page[l - 1] == '\n')
1176 --l;
1177 if (desc->opts_mutex)
1178 mutex_lock(desc->opts_mutex);
1179 memcpy(desc->ext_compat_id + 8, page, l);
1180
1181 if (desc->opts_mutex)
1182 mutex_unlock(desc->opts_mutex);
1183
1184 return len;
1185}
1186
1187CONFIGFS_ATTR(interf_grp_, compatible_id);
1188CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1189
1190static struct configfs_attribute *interf_grp_attrs[] = {
1191 &interf_grp_attr_compatible_id,
1192 &interf_grp_attr_sub_compatible_id,
1193 NULL
1194};
1195
1196struct config_group *usb_os_desc_prepare_interf_dir(
1197 struct config_group *parent,
1198 int n_interf,
1199 struct usb_os_desc **desc,
1200 char **names,
1201 struct module *owner)
1202{
1203 struct config_group *os_desc_group;
1204 struct config_item_type *os_desc_type, *interface_type;
1205
1206 vla_group(data_chunk);
1207 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1208 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1209 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1210
1211 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1212 if (!vlabuf)
1213 return ERR_PTR(-ENOMEM);
1214
1215 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1216 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1217 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1218
1219 os_desc_type->ct_owner = owner;
1220 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1221 configfs_add_default_group(os_desc_group, parent);
1222
1223 interface_type->ct_group_ops = &interf_grp_ops;
1224 interface_type->ct_attrs = interf_grp_attrs;
1225 interface_type->ct_owner = owner;
1226
1227 while (n_interf--) {
1228 struct usb_os_desc *d;
1229
1230 d = desc[n_interf];
1231 d->owner = owner;
1232 config_group_init_type_name(&d->group, "", interface_type);
1233 config_item_set_name(&d->group.cg_item, "interface.%s",
1234 names[n_interf]);
1235 configfs_add_default_group(&d->group, os_desc_group);
1236 }
1237
1238 return os_desc_group;
1239}
1240EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1241
1242static int configfs_do_nothing(struct usb_composite_dev *cdev)
1243{
1244 WARN_ON(1);
1245 return -EINVAL;
1246}
1247
1248int composite_dev_prepare(struct usb_composite_driver *composite,
1249 struct usb_composite_dev *dev);
1250
1251int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1252 struct usb_ep *ep0);
1253
1254static void purge_configs_funcs(struct gadget_info *gi)
1255{
1256 struct usb_configuration *c;
1257
1258 list_for_each_entry(c, &gi->cdev.configs, list) {
1259 struct usb_function *f, *tmp;
1260 struct config_usb_cfg *cfg;
1261
1262 cfg = container_of(c, struct config_usb_cfg, c);
1263
1264 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1265
1266 list_move(&f->list, &cfg->func_list);
1267 if (f->unbind) {
1268 dev_dbg(&gi->cdev.gadget->dev,
1269 "unbind function '%s'/%p\n",
1270 f->name, f);
1271 f->unbind(c, f);
1272 }
1273 }
1274 c->next_interface_id = 0;
1275 memset(c->interface, 0, sizeof(c->interface));
1276 c->superspeed_plus = 0;
1277 c->superspeed = 0;
1278 c->highspeed = 0;
1279 c->fullspeed = 0;
1280 }
1281}
1282
1283static int configfs_composite_bind(struct usb_gadget *gadget,
1284 struct usb_gadget_driver *gdriver)
1285{
1286 struct usb_composite_driver *composite = to_cdriver(gdriver);
1287 struct gadget_info *gi = container_of(composite,
1288 struct gadget_info, composite);
1289 struct usb_composite_dev *cdev = &gi->cdev;
1290 struct usb_configuration *c;
1291 struct usb_string *s;
1292 unsigned i;
1293 int ret;
1294
1295 /* the gi->lock is hold by the caller */
1296 gi->unbind = 0;
1297 cdev->gadget = gadget;
1298 set_gadget_data(gadget, cdev);
1299 ret = composite_dev_prepare(composite, cdev);
1300 if (ret)
1301 return ret;
1302 /* and now the gadget bind */
1303 ret = -EINVAL;
1304
1305 if (list_empty(&gi->cdev.configs)) {
1306 pr_err("Need at least one configuration in %s.\n",
1307 gi->composite.name);
1308 goto err_comp_cleanup;
1309 }
1310
1311
1312 list_for_each_entry(c, &gi->cdev.configs, list) {
1313 struct config_usb_cfg *cfg;
1314
1315 cfg = container_of(c, struct config_usb_cfg, c);
1316 if (list_empty(&cfg->func_list)) {
1317 pr_err("Config %s/%d of %s needs at least one function.\n",
1318 c->label, c->bConfigurationValue,
1319 gi->composite.name);
1320 goto err_comp_cleanup;
1321 }
1322 }
1323
1324 /* init all strings */
1325 if (!list_empty(&gi->string_list)) {
1326 struct gadget_strings *gs;
1327
1328 i = 0;
1329 list_for_each_entry(gs, &gi->string_list, list) {
1330
1331 gi->gstrings[i] = &gs->stringtab_dev;
1332 gs->stringtab_dev.strings = gs->strings;
1333 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1334 gs->manufacturer;
1335 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1336 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1337 i++;
1338 }
1339 gi->gstrings[i] = NULL;
1340 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1341 USB_GADGET_FIRST_AVAIL_IDX);
1342 if (IS_ERR(s)) {
1343 ret = PTR_ERR(s);
1344 goto err_comp_cleanup;
1345 }
1346
1347 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1348 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1349 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1350 }
1351
1352 if (gi->use_os_desc) {
1353 cdev->use_os_string = true;
1354 cdev->b_vendor_code = gi->b_vendor_code;
1355 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1356 }
1357
1358 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1359 struct usb_descriptor_header *usb_desc;
1360
1361 usb_desc = usb_otg_descriptor_alloc(gadget);
1362 if (!usb_desc) {
1363 ret = -ENOMEM;
1364 goto err_comp_cleanup;
1365 }
1366 usb_otg_descriptor_init(gadget, usb_desc);
1367 otg_desc[0] = usb_desc;
1368 otg_desc[1] = NULL;
1369 }
1370
1371 /* Go through all configs, attach all functions */
1372 list_for_each_entry(c, &gi->cdev.configs, list) {
1373 struct config_usb_cfg *cfg;
1374 struct usb_function *f;
1375 struct usb_function *tmp;
1376 struct gadget_config_name *cn;
1377
1378 if (gadget_is_otg(gadget))
1379 c->descriptors = otg_desc;
1380
1381 cfg = container_of(c, struct config_usb_cfg, c);
1382 if (!list_empty(&cfg->string_list)) {
1383 i = 0;
1384 list_for_each_entry(cn, &cfg->string_list, list) {
1385 cfg->gstrings[i] = &cn->stringtab_dev;
1386 cn->stringtab_dev.strings = &cn->strings;
1387 cn->strings.s = cn->configuration;
1388 i++;
1389 }
1390 cfg->gstrings[i] = NULL;
1391 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1392 if (IS_ERR(s)) {
1393 ret = PTR_ERR(s);
1394 goto err_comp_cleanup;
1395 }
1396 c->iConfiguration = s[0].id;
1397 }
1398
1399 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1400 list_del(&f->list);
1401 ret = usb_add_function(c, f);
1402 if (ret) {
1403 list_add(&f->list, &cfg->func_list);
1404 goto err_purge_funcs;
1405 }
1406 }
1407 usb_ep_autoconfig_reset(cdev->gadget);
1408 }
1409 if (cdev->use_os_string) {
1410 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1411 if (ret)
1412 goto err_purge_funcs;
1413 }
1414
1415 usb_ep_autoconfig_reset(cdev->gadget);
1416 return 0;
1417
1418err_purge_funcs:
1419 purge_configs_funcs(gi);
1420err_comp_cleanup:
1421 composite_dev_cleanup(cdev);
1422 return ret;
1423}
1424
1425static void configfs_composite_unbind(struct usb_gadget *gadget)
1426{
1427 struct usb_composite_dev *cdev;
1428 struct gadget_info *gi;
1429 unsigned long flags;
1430
1431 /* the gi->lock is hold by the caller */
1432
1433 cdev = get_gadget_data(gadget);
1434 gi = container_of(cdev, struct gadget_info, cdev);
1435 spin_lock_irqsave(&gi->spinlock, flags);
1436 gi->unbind = 1;
1437 spin_unlock_irqrestore(&gi->spinlock, flags);
1438
1439 kfree(otg_desc[0]);
1440 otg_desc[0] = NULL;
1441 purge_configs_funcs(gi);
1442 composite_dev_cleanup(cdev);
1443 usb_ep_autoconfig_reset(cdev->gadget);
1444 spin_lock_irqsave(&gi->spinlock, flags);
1445 cdev->gadget = NULL;
1446 set_gadget_data(gadget, NULL);
1447 spin_unlock_irqrestore(&gi->spinlock, flags);
1448}
1449
1450static int configfs_composite_setup(struct usb_gadget *gadget,
1451 const struct usb_ctrlrequest *ctrl)
1452{
1453 struct usb_composite_dev *cdev;
1454 struct gadget_info *gi;
1455 unsigned long flags;
1456 int ret;
1457
1458 cdev = get_gadget_data(gadget);
1459 if (!cdev)
1460 return 0;
1461
1462 gi = container_of(cdev, struct gadget_info, cdev);
1463 spin_lock_irqsave(&gi->spinlock, flags);
1464 cdev = get_gadget_data(gadget);
1465 if (!cdev || gi->unbind) {
1466 spin_unlock_irqrestore(&gi->spinlock, flags);
1467 return 0;
1468 }
1469
1470 ret = composite_setup(gadget, ctrl);
1471 spin_unlock_irqrestore(&gi->spinlock, flags);
1472 return ret;
1473}
1474
1475static void configfs_composite_disconnect(struct usb_gadget *gadget)
1476{
1477 struct usb_composite_dev *cdev;
1478 struct gadget_info *gi;
1479 unsigned long flags;
1480
1481 cdev = get_gadget_data(gadget);
1482 if (!cdev)
1483 return;
1484
1485 gi = container_of(cdev, struct gadget_info, cdev);
1486 spin_lock_irqsave(&gi->spinlock, flags);
1487 cdev = get_gadget_data(gadget);
1488 if (!cdev || gi->unbind) {
1489 spin_unlock_irqrestore(&gi->spinlock, flags);
1490 return;
1491 }
1492
1493 composite_disconnect(gadget);
1494 spin_unlock_irqrestore(&gi->spinlock, flags);
1495}
1496
1497static void configfs_composite_reset(struct usb_gadget *gadget)
1498{
1499 struct usb_composite_dev *cdev;
1500 struct gadget_info *gi;
1501 unsigned long flags;
1502
1503 cdev = get_gadget_data(gadget);
1504 if (!cdev)
1505 return;
1506
1507 gi = container_of(cdev, struct gadget_info, cdev);
1508 spin_lock_irqsave(&gi->spinlock, flags);
1509 cdev = get_gadget_data(gadget);
1510 if (!cdev || gi->unbind) {
1511 spin_unlock_irqrestore(&gi->spinlock, flags);
1512 return;
1513 }
1514
1515 composite_reset(gadget);
1516 spin_unlock_irqrestore(&gi->spinlock, flags);
1517}
1518
1519static void configfs_composite_suspend(struct usb_gadget *gadget)
1520{
1521 struct usb_composite_dev *cdev;
1522 struct gadget_info *gi;
1523 unsigned long flags;
1524
1525 cdev = get_gadget_data(gadget);
1526 if (!cdev)
1527 return;
1528
1529 gi = container_of(cdev, struct gadget_info, cdev);
1530 spin_lock_irqsave(&gi->spinlock, flags);
1531 cdev = get_gadget_data(gadget);
1532 if (!cdev || gi->unbind) {
1533 spin_unlock_irqrestore(&gi->spinlock, flags);
1534 return;
1535 }
1536
1537 composite_suspend(gadget);
1538 spin_unlock_irqrestore(&gi->spinlock, flags);
1539}
1540
1541static void configfs_composite_resume(struct usb_gadget *gadget)
1542{
1543 struct usb_composite_dev *cdev;
1544 struct gadget_info *gi;
1545 unsigned long flags;
1546
1547 cdev = get_gadget_data(gadget);
1548 if (!cdev)
1549 return;
1550
1551 gi = container_of(cdev, struct gadget_info, cdev);
1552 spin_lock_irqsave(&gi->spinlock, flags);
1553 cdev = get_gadget_data(gadget);
1554 if (!cdev || gi->unbind) {
1555 spin_unlock_irqrestore(&gi->spinlock, flags);
1556 return;
1557 }
1558
1559 composite_resume(gadget);
1560 spin_unlock_irqrestore(&gi->spinlock, flags);
1561}
1562
1563static const struct usb_gadget_driver configfs_driver_template = {
1564 .bind = configfs_composite_bind,
1565 .unbind = configfs_composite_unbind,
1566
1567 .setup = configfs_composite_setup,
1568 .reset = configfs_composite_reset,
1569 .disconnect = configfs_composite_disconnect,
1570
1571 .suspend = configfs_composite_suspend,
1572 .resume = configfs_composite_resume,
1573
1574 .max_speed = USB_SPEED_SUPER_PLUS,
1575 .driver = {
1576 .owner = THIS_MODULE,
1577 .name = "configfs-gadget",
1578 },
1579 .match_existing_only = 1,
1580};
1581
1582static struct config_group *gadgets_make(
1583 struct config_group *group,
1584 const char *name)
1585{
1586 struct gadget_info *gi;
1587
1588 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1589 if (!gi)
1590 return ERR_PTR(-ENOMEM);
1591
1592 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1593
1594 config_group_init_type_name(&gi->functions_group, "functions",
1595 &functions_type);
1596 configfs_add_default_group(&gi->functions_group, &gi->group);
1597
1598 config_group_init_type_name(&gi->configs_group, "configs",
1599 &config_desc_type);
1600 configfs_add_default_group(&gi->configs_group, &gi->group);
1601
1602 config_group_init_type_name(&gi->strings_group, "strings",
1603 &gadget_strings_strings_type);
1604 configfs_add_default_group(&gi->strings_group, &gi->group);
1605
1606 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1607 &os_desc_type);
1608 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1609
1610 gi->composite.bind = configfs_do_nothing;
1611 gi->composite.unbind = configfs_do_nothing;
1612 gi->composite.suspend = NULL;
1613 gi->composite.resume = NULL;
1614 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
1615
1616 spin_lock_init(&gi->spinlock);
1617 mutex_init(&gi->lock);
1618 INIT_LIST_HEAD(&gi->string_list);
1619 INIT_LIST_HEAD(&gi->available_func);
1620
1621 composite_init_dev(&gi->cdev);
1622 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1623 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1624 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1625
1626 gi->composite.gadget_driver = configfs_driver_template;
1627
1628 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1629 gi->composite.name = gi->composite.gadget_driver.function;
1630
1631 if (!gi->composite.gadget_driver.function)
1632 goto err;
1633
1634 return &gi->group;
1635err:
1636 kfree(gi);
1637 return ERR_PTR(-ENOMEM);
1638}
1639
1640static void gadgets_drop(struct config_group *group, struct config_item *item)
1641{
1642 config_item_put(item);
1643}
1644
1645static struct configfs_group_operations gadgets_ops = {
1646 .make_group = &gadgets_make,
1647 .drop_item = &gadgets_drop,
1648};
1649
1650static const struct config_item_type gadgets_type = {
1651 .ct_group_ops = &gadgets_ops,
1652 .ct_owner = THIS_MODULE,
1653};
1654
1655static struct configfs_subsystem gadget_subsys = {
1656 .su_group = {
1657 .cg_item = {
1658 .ci_namebuf = "usb_gadget",
1659 .ci_type = &gadgets_type,
1660 },
1661 },
1662 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1663};
1664
1665void unregister_gadget_item(struct config_item *item)
1666{
1667 struct gadget_info *gi = to_gadget_info(item);
1668
1669 mutex_lock(&gi->lock);
1670 unregister_gadget(gi);
1671 mutex_unlock(&gi->lock);
1672}
1673EXPORT_SYMBOL_GPL(unregister_gadget_item);
1674
1675static int __init gadget_cfs_init(void)
1676{
1677 int ret;
1678
1679 config_group_init(&gadget_subsys.su_group);
1680
1681 ret = configfs_register_subsystem(&gadget_subsys);
1682 return ret;
1683}
1684module_init(gadget_cfs_init);
1685
1686static void __exit gadget_cfs_exit(void)
1687{
1688 configfs_unregister_subsystem(&gadget_subsys);
1689}
1690module_exit(gadget_cfs_exit);