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dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / usb / gadget / configfs.c
blob6abb6a10ee8218727592bc36fce7f2668ebf2e0f
1 #include <linux/configfs.h>
2 #include <linux/module.h>
3 #include <linux/slab.h>
4 #include <linux/device.h>
5 #include <linux/nls.h>
6 #include <linux/usb/composite.h>
7 #include <linux/usb/gadget_configfs.h>
8 #include "configfs.h"
9 #include "u_f.h"
10 #include "u_os_desc.h"
11
12 int check_user_usb_string(const char *name,
13 struct usb_gadget_strings *stringtab_dev)
14 {
15 unsigned primary_lang;
16 unsigned sub_lang;
17 u16 num;
18 int ret;
19
20 ret = kstrtou16(name, 0, &num);
21 if (ret)
22 return ret;
23
24 primary_lang = num & 0x3ff;
25 sub_lang = num >> 10;
26
27 /* simple sanity check for valid langid */
28 switch (primary_lang) {
29 case 0:
30 case 0x62 ... 0xfe:
31 case 0x100 ... 0x3ff:
32 return -EINVAL;
33 }
34 if (!sub_lang)
35 return -EINVAL;
36
37 stringtab_dev->language = num;
38 return 0;
39 }
40
41 #define MAX_NAME_LEN 40
42 #define MAX_USB_STRING_LANGS 2
43
44 static const struct usb_descriptor_header *otg_desc[2];
45
46 struct gadget_info {
47 struct config_group group;
48 struct config_group functions_group;
49 struct config_group configs_group;
50 struct config_group strings_group;
51 struct config_group os_desc_group;
52 struct config_group *default_groups[5];
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 const char *udc_name;
60 struct usb_composite_driver composite;
61 struct usb_composite_dev cdev;
62 bool use_os_desc;
63 char b_vendor_code;
64 char qw_sign[OS_STRING_QW_SIGN_LEN];
65 };
66
67 static inline struct gadget_info *to_gadget_info(struct config_item *item)
68 {
69 return container_of(to_config_group(item), struct gadget_info, group);
70 }
71
72 struct config_usb_cfg {
73 struct config_group group;
74 struct config_group strings_group;
75 struct config_group *default_groups[2];
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
82 static 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
88 struct 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
99 struct os_desc {
100 struct config_group group;
101 };
102
103 struct 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
112 static 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) \
132 static 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) \
140 static 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) \
149 static 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) \
162 static 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
178 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
179 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
180 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
181 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
182 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
183 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
184 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
185 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
186
187 static 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
200 static 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
217 static 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
234 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
235 {
236 return sprintf(page, "%s\n", to_gadget_info(item)->udc_name ?: "");
237 }
238
239 static int unregister_gadget(struct gadget_info *gi)
240 {
241 int ret;
242
243 if (!gi->udc_name)
244 return -ENODEV;
245
246 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
247 if (ret)
248 return ret;
249 kfree(gi->udc_name);
250 gi->udc_name = NULL;
251 return 0;
252 }
253
254 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
255 const char *page, size_t len)
256 {
257 struct gadget_info *gi = to_gadget_info(item);
258 char *name;
259 int ret;
260
261 name = kstrdup(page, GFP_KERNEL);
262 if (!name)
263 return -ENOMEM;
264 if (name[len - 1] == '\n')
265 name[len - 1] = '\0';
266
267 mutex_lock(&gi->lock);
268
269 if (!strlen(name)) {
270 ret = unregister_gadget(gi);
271 if (ret)
272 goto err;
273 kfree(name);
274 } else {
275 if (gi->udc_name) {
276 ret = -EBUSY;
277 goto err;
278 }
279 ret = usb_udc_attach_driver(name, &gi->composite.gadget_driver);
280 if (ret)
281 goto err;
282 gi->udc_name = name;
283 }
284 mutex_unlock(&gi->lock);
285 return len;
286 err:
287 kfree(name);
288 mutex_unlock(&gi->lock);
289 return ret;
290 }
291
292 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
293 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
294 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
295 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
296 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
297 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
298 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
299 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
300 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
301
302 static 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
315 static 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
321 static 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
328 static 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
335 static 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
346 static struct configfs_item_operations gadget_root_item_ops = {
347 .release = gadget_info_attr_release,
348 };
349
350 static 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
360 static 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;
406 out:
407 mutex_unlock(&gi->lock);
408 return ret;
409 }
410
411 static 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->udc_name)
432 unregister_gadget(gi);
433 WARN_ON(gi->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
448 static struct configfs_item_operations gadget_config_item_ops = {
449 .release = gadget_config_attr_release,
450 .allow_link = config_usb_cfg_link,
451 .drop_link = config_usb_cfg_unlink,
452 };
453
454
455 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
456 char *page)
457 {
458 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
459 }
460
461 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
462 const char *page, size_t len)
463 {
464 u16 val;
465 int ret;
466 ret = kstrtou16(page, 0, &val);
467 if (ret)
468 return ret;
469 if (DIV_ROUND_UP(val, 8) > 0xff)
470 return -ERANGE;
471 to_config_usb_cfg(item)->c.MaxPower = val;
472 return len;
473 }
474
475 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
476 char *page)
477 {
478 return sprintf(page, "0x%02x\n",
479 to_config_usb_cfg(item)->c.bmAttributes);
480 }
481
482 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
483 const char *page, size_t len)
484 {
485 u8 val;
486 int ret;
487 ret = kstrtou8(page, 0, &val);
488 if (ret)
489 return ret;
490 if (!(val & USB_CONFIG_ATT_ONE))
491 return -EINVAL;
492 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
493 USB_CONFIG_ATT_WAKEUP))
494 return -EINVAL;
495 to_config_usb_cfg(item)->c.bmAttributes = val;
496 return len;
497 }
498
499 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
500 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
501
502 static struct configfs_attribute *gadget_config_attrs[] = {
503 &gadget_config_desc_attr_MaxPower,
504 &gadget_config_desc_attr_bmAttributes,
505 NULL,
506 };
507
508 static struct config_item_type gadget_config_type = {
509 .ct_item_ops = &gadget_config_item_ops,
510 .ct_attrs = gadget_config_attrs,
511 .ct_owner = THIS_MODULE,
512 };
513
514 static struct config_item_type gadget_root_type = {
515 .ct_item_ops = &gadget_root_item_ops,
516 .ct_attrs = gadget_root_attrs,
517 .ct_owner = THIS_MODULE,
518 };
519
520 static void composite_init_dev(struct usb_composite_dev *cdev)
521 {
522 spin_lock_init(&cdev->lock);
523 INIT_LIST_HEAD(&cdev->configs);
524 INIT_LIST_HEAD(&cdev->gstrings);
525 }
526
527 static struct config_group *function_make(
528 struct config_group *group,
529 const char *name)
530 {
531 struct gadget_info *gi;
532 struct usb_function_instance *fi;
533 char buf[MAX_NAME_LEN];
534 char *func_name;
535 char *instance_name;
536 int ret;
537
538 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
539 if (ret >= MAX_NAME_LEN)
540 return ERR_PTR(-ENAMETOOLONG);
541
542 func_name = buf;
543 instance_name = strchr(func_name, '.');
544 if (!instance_name) {
545 pr_err("Unable to locate . in FUNC.INSTANCE\n");
546 return ERR_PTR(-EINVAL);
547 }
548 *instance_name = '\0';
549 instance_name++;
550
551 fi = usb_get_function_instance(func_name);
552 if (IS_ERR(fi))
553 return ERR_CAST(fi);
554
555 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
556 if (ret) {
557 usb_put_function_instance(fi);
558 return ERR_PTR(ret);
559 }
560 if (fi->set_inst_name) {
561 ret = fi->set_inst_name(fi, instance_name);
562 if (ret) {
563 usb_put_function_instance(fi);
564 return ERR_PTR(ret);
565 }
566 }
567
568 gi = container_of(group, struct gadget_info, functions_group);
569
570 mutex_lock(&gi->lock);
571 list_add_tail(&fi->cfs_list, &gi->available_func);
572 mutex_unlock(&gi->lock);
573 return &fi->group;
574 }
575
576 static void function_drop(
577 struct config_group *group,
578 struct config_item *item)
579 {
580 struct usb_function_instance *fi = to_usb_function_instance(item);
581 struct gadget_info *gi;
582
583 gi = container_of(group, struct gadget_info, functions_group);
584
585 mutex_lock(&gi->lock);
586 list_del(&fi->cfs_list);
587 mutex_unlock(&gi->lock);
588 config_item_put(item);
589 }
590
591 static struct configfs_group_operations functions_ops = {
592 .make_group = &function_make,
593 .drop_item = &function_drop,
594 };
595
596 static struct config_item_type functions_type = {
597 .ct_group_ops = &functions_ops,
598 .ct_owner = THIS_MODULE,
599 };
600
601 GS_STRINGS_RW(gadget_config_name, configuration);
602
603 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
604 &gadget_config_name_attr_configuration,
605 NULL,
606 };
607
608 static void gadget_config_name_attr_release(struct config_item *item)
609 {
610 struct gadget_config_name *cn = to_gadget_config_name(item);
611
612 kfree(cn->configuration);
613
614 list_del(&cn->list);
615 kfree(cn);
616 }
617
618 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
619 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
620
621 static struct config_group *config_desc_make(
622 struct config_group *group,
623 const char *name)
624 {
625 struct gadget_info *gi;
626 struct config_usb_cfg *cfg;
627 char buf[MAX_NAME_LEN];
628 char *num_str;
629 u8 num;
630 int ret;
631
632 gi = container_of(group, struct gadget_info, configs_group);
633 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
634 if (ret >= MAX_NAME_LEN)
635 return ERR_PTR(-ENAMETOOLONG);
636
637 num_str = strchr(buf, '.');
638 if (!num_str) {
639 pr_err("Unable to locate . in name.bConfigurationValue\n");
640 return ERR_PTR(-EINVAL);
641 }
642
643 *num_str = '\0';
644 num_str++;
645
646 if (!strlen(buf))
647 return ERR_PTR(-EINVAL);
648
649 ret = kstrtou8(num_str, 0, &num);
650 if (ret)
651 return ERR_PTR(ret);
652
653 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
654 if (!cfg)
655 return ERR_PTR(-ENOMEM);
656 cfg->c.label = kstrdup(buf, GFP_KERNEL);
657 if (!cfg->c.label) {
658 ret = -ENOMEM;
659 goto err;
660 }
661 cfg->c.bConfigurationValue = num;
662 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
663 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
664 INIT_LIST_HEAD(&cfg->string_list);
665 INIT_LIST_HEAD(&cfg->func_list);
666
667 cfg->group.default_groups = cfg->default_groups;
668 cfg->default_groups[0] = &cfg->strings_group;
669
670 config_group_init_type_name(&cfg->group, name,
671 &gadget_config_type);
672 config_group_init_type_name(&cfg->strings_group, "strings",
673 &gadget_config_name_strings_type);
674
675 ret = usb_add_config_only(&gi->cdev, &cfg->c);
676 if (ret)
677 goto err;
678
679 return &cfg->group;
680 err:
681 kfree(cfg->c.label);
682 kfree(cfg);
683 return ERR_PTR(ret);
684 }
685
686 static void config_desc_drop(
687 struct config_group *group,
688 struct config_item *item)
689 {
690 config_item_put(item);
691 }
692
693 static struct configfs_group_operations config_desc_ops = {
694 .make_group = &config_desc_make,
695 .drop_item = &config_desc_drop,
696 };
697
698 static struct config_item_type config_desc_type = {
699 .ct_group_ops = &config_desc_ops,
700 .ct_owner = THIS_MODULE,
701 };
702
703 GS_STRINGS_RW(gadget_strings, manufacturer);
704 GS_STRINGS_RW(gadget_strings, product);
705 GS_STRINGS_RW(gadget_strings, serialnumber);
706
707 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
708 &gadget_strings_attr_manufacturer,
709 &gadget_strings_attr_product,
710 &gadget_strings_attr_serialnumber,
711 NULL,
712 };
713
714 static void gadget_strings_attr_release(struct config_item *item)
715 {
716 struct gadget_strings *gs = to_gadget_strings(item);
717
718 kfree(gs->manufacturer);
719 kfree(gs->product);
720 kfree(gs->serialnumber);
721
722 list_del(&gs->list);
723 kfree(gs);
724 }
725
726 USB_CONFIG_STRING_RW_OPS(gadget_strings);
727 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
728
729 static inline struct os_desc *to_os_desc(struct config_item *item)
730 {
731 return container_of(to_config_group(item), struct os_desc, group);
732 }
733
734 static inline struct gadget_info *os_desc_item_to_gadget_info(
735 struct config_item *item)
736 {
737 return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
738 }
739
740 static ssize_t os_desc_use_show(struct config_item *item, char *page)
741 {
742 return sprintf(page, "%d",
743 os_desc_item_to_gadget_info(item)->use_os_desc);
744 }
745
746 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
747 size_t len)
748 {
749 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
750 int ret;
751 bool use;
752
753 mutex_lock(&gi->lock);
754 ret = strtobool(page, &use);
755 if (!ret) {
756 gi->use_os_desc = use;
757 ret = len;
758 }
759 mutex_unlock(&gi->lock);
760
761 return ret;
762 }
763
764 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
765 {
766 return sprintf(page, "%d",
767 os_desc_item_to_gadget_info(item)->b_vendor_code);
768 }
769
770 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
771 const char *page, size_t len)
772 {
773 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
774 int ret;
775 u8 b_vendor_code;
776
777 mutex_lock(&gi->lock);
778 ret = kstrtou8(page, 0, &b_vendor_code);
779 if (!ret) {
780 gi->b_vendor_code = b_vendor_code;
781 ret = len;
782 }
783 mutex_unlock(&gi->lock);
784
785 return ret;
786 }
787
788 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
789 {
790 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
791
792 memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
793 return OS_STRING_QW_SIGN_LEN;
794 }
795
796 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
797 size_t len)
798 {
799 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
800 int res, l;
801
802 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
803 if (page[l - 1] == '\n')
804 --l;
805
806 mutex_lock(&gi->lock);
807 res = utf8s_to_utf16s(page, l,
808 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
809 OS_STRING_QW_SIGN_LEN);
810 if (res > 0)
811 res = len;
812 mutex_unlock(&gi->lock);
813
814 return res;
815 }
816
817 CONFIGFS_ATTR(os_desc_, use);
818 CONFIGFS_ATTR(os_desc_, b_vendor_code);
819 CONFIGFS_ATTR(os_desc_, qw_sign);
820
821 static struct configfs_attribute *os_desc_attrs[] = {
822 &os_desc_attr_use,
823 &os_desc_attr_b_vendor_code,
824 &os_desc_attr_qw_sign,
825 NULL,
826 };
827
828 static void os_desc_attr_release(struct config_item *item)
829 {
830 struct os_desc *os_desc = to_os_desc(item);
831 kfree(os_desc);
832 }
833
834 static int os_desc_link(struct config_item *os_desc_ci,
835 struct config_item *usb_cfg_ci)
836 {
837 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
838 struct gadget_info, os_desc_group);
839 struct usb_composite_dev *cdev = &gi->cdev;
840 struct config_usb_cfg *c_target =
841 container_of(to_config_group(usb_cfg_ci),
842 struct config_usb_cfg, group);
843 struct usb_configuration *c;
844 int ret;
845
846 mutex_lock(&gi->lock);
847 list_for_each_entry(c, &cdev->configs, list) {
848 if (c == &c_target->c)
849 break;
850 }
851 if (c != &c_target->c) {
852 ret = -EINVAL;
853 goto out;
854 }
855
856 if (cdev->os_desc_config) {
857 ret = -EBUSY;
858 goto out;
859 }
860
861 cdev->os_desc_config = &c_target->c;
862 ret = 0;
863
864 out:
865 mutex_unlock(&gi->lock);
866 return ret;
867 }
868
869 static int os_desc_unlink(struct config_item *os_desc_ci,
870 struct config_item *usb_cfg_ci)
871 {
872 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
873 struct gadget_info, os_desc_group);
874 struct usb_composite_dev *cdev = &gi->cdev;
875
876 mutex_lock(&gi->lock);
877 if (gi->udc_name)
878 unregister_gadget(gi);
879 cdev->os_desc_config = NULL;
880 WARN_ON(gi->udc_name);
881 mutex_unlock(&gi->lock);
882 return 0;
883 }
884
885 static struct configfs_item_operations os_desc_ops = {
886 .release = os_desc_attr_release,
887 .allow_link = os_desc_link,
888 .drop_link = os_desc_unlink,
889 };
890
891 static struct config_item_type os_desc_type = {
892 .ct_item_ops = &os_desc_ops,
893 .ct_attrs = os_desc_attrs,
894 .ct_owner = THIS_MODULE,
895 };
896
897 static inline struct usb_os_desc_ext_prop
898 *to_usb_os_desc_ext_prop(struct config_item *item)
899 {
900 return container_of(item, struct usb_os_desc_ext_prop, item);
901 }
902
903 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
904 {
905 return sprintf(page, "%d", to_usb_os_desc_ext_prop(item)->type);
906 }
907
908 static ssize_t ext_prop_type_store(struct config_item *item,
909 const char *page, size_t len)
910 {
911 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
912 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
913 u8 type;
914 int ret;
915
916 if (desc->opts_mutex)
917 mutex_lock(desc->opts_mutex);
918 ret = kstrtou8(page, 0, &type);
919 if (ret)
920 goto end;
921 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
922 ret = -EINVAL;
923 goto end;
924 }
925
926 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
927 ext_prop->type == USB_EXT_PROP_LE32 ||
928 ext_prop->type == USB_EXT_PROP_BE32) &&
929 (type == USB_EXT_PROP_UNICODE ||
930 type == USB_EXT_PROP_UNICODE_ENV ||
931 type == USB_EXT_PROP_UNICODE_LINK))
932 ext_prop->data_len <<= 1;
933 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
934 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
935 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
936 (type == USB_EXT_PROP_BINARY ||
937 type == USB_EXT_PROP_LE32 ||
938 type == USB_EXT_PROP_BE32))
939 ext_prop->data_len >>= 1;
940 ext_prop->type = type;
941 ret = len;
942
943 end:
944 if (desc->opts_mutex)
945 mutex_unlock(desc->opts_mutex);
946 return ret;
947 }
948
949 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
950 {
951 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
952 int len = ext_prop->data_len;
953
954 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
955 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
956 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
957 len >>= 1;
958 memcpy(page, ext_prop->data, len);
959
960 return len;
961 }
962
963 static ssize_t ext_prop_data_store(struct config_item *item,
964 const char *page, size_t len)
965 {
966 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
967 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
968 char *new_data;
969 size_t ret_len = len;
970
971 if (page[len - 1] == '\n' || page[len - 1] == '\0')
972 --len;
973 new_data = kmemdup(page, len, GFP_KERNEL);
974 if (!new_data)
975 return -ENOMEM;
976
977 if (desc->opts_mutex)
978 mutex_lock(desc->opts_mutex);
979 kfree(ext_prop->data);
980 ext_prop->data = new_data;
981 desc->ext_prop_len -= ext_prop->data_len;
982 ext_prop->data_len = len;
983 desc->ext_prop_len += ext_prop->data_len;
984 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
985 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
986 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
987 desc->ext_prop_len -= ext_prop->data_len;
988 ext_prop->data_len <<= 1;
989 ext_prop->data_len += 2;
990 desc->ext_prop_len += ext_prop->data_len;
991 }
992 if (desc->opts_mutex)
993 mutex_unlock(desc->opts_mutex);
994 return ret_len;
995 }
996
997 CONFIGFS_ATTR(ext_prop_, type);
998 CONFIGFS_ATTR(ext_prop_, data);
999
1000 static struct configfs_attribute *ext_prop_attrs[] = {
1001 &ext_prop_attr_type,
1002 &ext_prop_attr_data,
1003 NULL,
1004 };
1005
1006 static void usb_os_desc_ext_prop_release(struct config_item *item)
1007 {
1008 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1009
1010 kfree(ext_prop); /* frees a whole chunk */
1011 }
1012
1013 static struct configfs_item_operations ext_prop_ops = {
1014 .release = usb_os_desc_ext_prop_release,
1015 };
1016
1017 static struct config_item *ext_prop_make(
1018 struct config_group *group,
1019 const char *name)
1020 {
1021 struct usb_os_desc_ext_prop *ext_prop;
1022 struct config_item_type *ext_prop_type;
1023 struct usb_os_desc *desc;
1024 char *vlabuf;
1025
1026 vla_group(data_chunk);
1027 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1028 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1029
1030 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1031 if (!vlabuf)
1032 return ERR_PTR(-ENOMEM);
1033
1034 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1035 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1036
1037 desc = container_of(group, struct usb_os_desc, group);
1038 ext_prop_type->ct_item_ops = &ext_prop_ops;
1039 ext_prop_type->ct_attrs = ext_prop_attrs;
1040 ext_prop_type->ct_owner = desc->owner;
1041
1042 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1043
1044 ext_prop->name = kstrdup(name, GFP_KERNEL);
1045 if (!ext_prop->name) {
1046 kfree(vlabuf);
1047 return ERR_PTR(-ENOMEM);
1048 }
1049 desc->ext_prop_len += 14;
1050 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1051 if (desc->opts_mutex)
1052 mutex_lock(desc->opts_mutex);
1053 desc->ext_prop_len += ext_prop->name_len;
1054 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1055 ++desc->ext_prop_count;
1056 if (desc->opts_mutex)
1057 mutex_unlock(desc->opts_mutex);
1058
1059 return &ext_prop->item;
1060 }
1061
1062 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1063 {
1064 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1065 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1066
1067 if (desc->opts_mutex)
1068 mutex_lock(desc->opts_mutex);
1069 list_del(&ext_prop->entry);
1070 --desc->ext_prop_count;
1071 kfree(ext_prop->name);
1072 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1073 if (desc->opts_mutex)
1074 mutex_unlock(desc->opts_mutex);
1075 config_item_put(item);
1076 }
1077
1078 static struct configfs_group_operations interf_grp_ops = {
1079 .make_item = &ext_prop_make,
1080 .drop_item = &ext_prop_drop,
1081 };
1082
1083 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1084 char *page)
1085 {
1086 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1087 return 8;
1088 }
1089
1090 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1091 const char *page, size_t len)
1092 {
1093 struct usb_os_desc *desc = to_usb_os_desc(item);
1094 int l;
1095
1096 l = min_t(int, 8, len);
1097 if (page[l - 1] == '\n')
1098 --l;
1099 if (desc->opts_mutex)
1100 mutex_lock(desc->opts_mutex);
1101 memcpy(desc->ext_compat_id, page, l);
1102
1103 if (desc->opts_mutex)
1104 mutex_unlock(desc->opts_mutex);
1105
1106 return len;
1107 }
1108
1109 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1110 char *page)
1111 {
1112 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1113 return 8;
1114 }
1115
1116 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1117 const char *page, size_t len)
1118 {
1119 struct usb_os_desc *desc = to_usb_os_desc(item);
1120 int l;
1121
1122 l = min_t(int, 8, len);
1123 if (page[l - 1] == '\n')
1124 --l;
1125 if (desc->opts_mutex)
1126 mutex_lock(desc->opts_mutex);
1127 memcpy(desc->ext_compat_id + 8, page, l);
1128
1129 if (desc->opts_mutex)
1130 mutex_unlock(desc->opts_mutex);
1131
1132 return len;
1133 }
1134
1135 CONFIGFS_ATTR(interf_grp_, compatible_id);
1136 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1137
1138 static struct configfs_attribute *interf_grp_attrs[] = {
1139 &interf_grp_attr_compatible_id,
1140 &interf_grp_attr_sub_compatible_id,
1141 NULL
1142 };
1143
1144 int usb_os_desc_prepare_interf_dir(struct config_group *parent,
1145 int n_interf,
1146 struct usb_os_desc **desc,
1147 char **names,
1148 struct module *owner)
1149 {
1150 struct config_group **f_default_groups, *os_desc_group,
1151 **interface_groups;
1152 struct config_item_type *os_desc_type, *interface_type;
1153
1154 vla_group(data_chunk);
1155 vla_item(data_chunk, struct config_group *, f_default_groups, 2);
1156 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1157 vla_item(data_chunk, struct config_group *, interface_groups,
1158 n_interf + 1);
1159 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1160 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1161
1162 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1163 if (!vlabuf)
1164 return -ENOMEM;
1165
1166 f_default_groups = vla_ptr(vlabuf, data_chunk, f_default_groups);
1167 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1168 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1169 interface_groups = vla_ptr(vlabuf, data_chunk, interface_groups);
1170 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1171
1172 parent->default_groups = f_default_groups;
1173 os_desc_type->ct_owner = owner;
1174 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1175 f_default_groups[0] = os_desc_group;
1176
1177 os_desc_group->default_groups = interface_groups;
1178 interface_type->ct_group_ops = &interf_grp_ops;
1179 interface_type->ct_attrs = interf_grp_attrs;
1180 interface_type->ct_owner = owner;
1181
1182 while (n_interf--) {
1183 struct usb_os_desc *d;
1184
1185 d = desc[n_interf];
1186 d->owner = owner;
1187 config_group_init_type_name(&d->group, "", interface_type);
1188 config_item_set_name(&d->group.cg_item, "interface.%s",
1189 names[n_interf]);
1190 interface_groups[n_interf] = &d->group;
1191 }
1192
1193 return 0;
1194 }
1195 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1196
1197 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1198 {
1199 WARN_ON(1);
1200 return -EINVAL;
1201 }
1202
1203 int composite_dev_prepare(struct usb_composite_driver *composite,
1204 struct usb_composite_dev *dev);
1205
1206 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1207 struct usb_ep *ep0);
1208
1209 static void purge_configs_funcs(struct gadget_info *gi)
1210 {
1211 struct usb_configuration *c;
1212
1213 list_for_each_entry(c, &gi->cdev.configs, list) {
1214 struct usb_function *f, *tmp;
1215 struct config_usb_cfg *cfg;
1216
1217 cfg = container_of(c, struct config_usb_cfg, c);
1218
1219 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1220
1221 list_move_tail(&f->list, &cfg->func_list);
1222 if (f->unbind) {
1223 dev_err(&gi->cdev.gadget->dev, "unbind function"
1224 " '%s'/%p\n", f->name, f);
1225 f->unbind(c, f);
1226 }
1227 }
1228 c->next_interface_id = 0;
1229 memset(c->interface, 0, sizeof(c->interface));
1230 c->superspeed = 0;
1231 c->highspeed = 0;
1232 c->fullspeed = 0;
1233 }
1234 }
1235
1236 static 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 cdev->gadget = gadget;
1250 set_gadget_data(gadget, cdev);
1251 ret = composite_dev_prepare(composite, cdev);
1252 if (ret)
1253 return ret;
1254 /* and now the gadget bind */
1255 ret = -EINVAL;
1256
1257 if (list_empty(&gi->cdev.configs)) {
1258 pr_err("Need at least one configuration in %s.\n",
1259 gi->composite.name);
1260 goto err_comp_cleanup;
1261 }
1262
1263
1264 list_for_each_entry(c, &gi->cdev.configs, list) {
1265 struct config_usb_cfg *cfg;
1266
1267 cfg = container_of(c, struct config_usb_cfg, c);
1268 if (list_empty(&cfg->func_list)) {
1269 pr_err("Config %s/%d of %s needs at least one function.\n",
1270 c->label, c->bConfigurationValue,
1271 gi->composite.name);
1272 goto err_comp_cleanup;
1273 }
1274 }
1275
1276 /* init all strings */
1277 if (!list_empty(&gi->string_list)) {
1278 struct gadget_strings *gs;
1279
1280 i = 0;
1281 list_for_each_entry(gs, &gi->string_list, list) {
1282
1283 gi->gstrings[i] = &gs->stringtab_dev;
1284 gs->stringtab_dev.strings = gs->strings;
1285 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1286 gs->manufacturer;
1287 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1288 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1289 i++;
1290 }
1291 gi->gstrings[i] = NULL;
1292 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1293 USB_GADGET_FIRST_AVAIL_IDX);
1294 if (IS_ERR(s)) {
1295 ret = PTR_ERR(s);
1296 goto err_comp_cleanup;
1297 }
1298
1299 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1300 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1301 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1302 }
1303
1304 if (gi->use_os_desc) {
1305 cdev->use_os_string = true;
1306 cdev->b_vendor_code = gi->b_vendor_code;
1307 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1308 }
1309
1310 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1311 struct usb_descriptor_header *usb_desc;
1312
1313 usb_desc = usb_otg_descriptor_alloc(gadget);
1314 if (!usb_desc) {
1315 ret = -ENOMEM;
1316 goto err_comp_cleanup;
1317 }
1318 usb_otg_descriptor_init(gadget, usb_desc);
1319 otg_desc[0] = usb_desc;
1320 otg_desc[1] = NULL;
1321 }
1322
1323 /* Go through all configs, attach all functions */
1324 list_for_each_entry(c, &gi->cdev.configs, list) {
1325 struct config_usb_cfg *cfg;
1326 struct usb_function *f;
1327 struct usb_function *tmp;
1328 struct gadget_config_name *cn;
1329
1330 if (gadget_is_otg(gadget))
1331 c->descriptors = otg_desc;
1332
1333 cfg = container_of(c, struct config_usb_cfg, c);
1334 if (!list_empty(&cfg->string_list)) {
1335 i = 0;
1336 list_for_each_entry(cn, &cfg->string_list, list) {
1337 cfg->gstrings[i] = &cn->stringtab_dev;
1338 cn->stringtab_dev.strings = &cn->strings;
1339 cn->strings.s = cn->configuration;
1340 i++;
1341 }
1342 cfg->gstrings[i] = NULL;
1343 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1344 if (IS_ERR(s)) {
1345 ret = PTR_ERR(s);
1346 goto err_comp_cleanup;
1347 }
1348 c->iConfiguration = s[0].id;
1349 }
1350
1351 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1352 list_del(&f->list);
1353 ret = usb_add_function(c, f);
1354 if (ret) {
1355 list_add(&f->list, &cfg->func_list);
1356 goto err_purge_funcs;
1357 }
1358 }
1359 usb_ep_autoconfig_reset(cdev->gadget);
1360 }
1361 if (cdev->use_os_string) {
1362 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1363 if (ret)
1364 goto err_purge_funcs;
1365 }
1366
1367 usb_ep_autoconfig_reset(cdev->gadget);
1368 return 0;
1369
1370 err_purge_funcs:
1371 purge_configs_funcs(gi);
1372 err_comp_cleanup:
1373 composite_dev_cleanup(cdev);
1374 return ret;
1375 }
1376
1377 static void configfs_composite_unbind(struct usb_gadget *gadget)
1378 {
1379 struct usb_composite_dev *cdev;
1380 struct gadget_info *gi;
1381
1382 /* the gi->lock is hold by the caller */
1383
1384 cdev = get_gadget_data(gadget);
1385 gi = container_of(cdev, struct gadget_info, cdev);
1386
1387 kfree(otg_desc[0]);
1388 otg_desc[0] = NULL;
1389 purge_configs_funcs(gi);
1390 composite_dev_cleanup(cdev);
1391 usb_ep_autoconfig_reset(cdev->gadget);
1392 cdev->gadget = NULL;
1393 set_gadget_data(gadget, NULL);
1394 }
1395
1396 static const struct usb_gadget_driver configfs_driver_template = {
1397 .bind = configfs_composite_bind,
1398 .unbind = configfs_composite_unbind,
1399
1400 .setup = composite_setup,
1401 .reset = composite_disconnect,
1402 .disconnect = composite_disconnect,
1403
1404 .suspend = composite_suspend,
1405 .resume = composite_resume,
1406
1407 .max_speed = USB_SPEED_SUPER,
1408 .driver = {
1409 .owner = THIS_MODULE,
1410 .name = "configfs-gadget",
1411 },
1412 };
1413
1414 static struct config_group *gadgets_make(
1415 struct config_group *group,
1416 const char *name)
1417 {
1418 struct gadget_info *gi;
1419
1420 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1421 if (!gi)
1422 return ERR_PTR(-ENOMEM);
1423
1424 gi->group.default_groups = gi->default_groups;
1425 gi->group.default_groups[0] = &gi->functions_group;
1426 gi->group.default_groups[1] = &gi->configs_group;
1427 gi->group.default_groups[2] = &gi->strings_group;
1428 gi->group.default_groups[3] = &gi->os_desc_group;
1429
1430 config_group_init_type_name(&gi->functions_group, "functions",
1431 &functions_type);
1432 config_group_init_type_name(&gi->configs_group, "configs",
1433 &config_desc_type);
1434 config_group_init_type_name(&gi->strings_group, "strings",
1435 &gadget_strings_strings_type);
1436 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1437 &os_desc_type);
1438
1439 gi->composite.bind = configfs_do_nothing;
1440 gi->composite.unbind = configfs_do_nothing;
1441 gi->composite.suspend = NULL;
1442 gi->composite.resume = NULL;
1443 gi->composite.max_speed = USB_SPEED_SUPER;
1444
1445 mutex_init(&gi->lock);
1446 INIT_LIST_HEAD(&gi->string_list);
1447 INIT_LIST_HEAD(&gi->available_func);
1448
1449 composite_init_dev(&gi->cdev);
1450 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1451 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1452 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1453
1454 gi->composite.gadget_driver = configfs_driver_template;
1455
1456 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1457 gi->composite.name = gi->composite.gadget_driver.function;
1458
1459 if (!gi->composite.gadget_driver.function)
1460 goto err;
1461
1462 config_group_init_type_name(&gi->group, name,
1463 &gadget_root_type);
1464 return &gi->group;
1465 err:
1466 kfree(gi);
1467 return ERR_PTR(-ENOMEM);
1468 }
1469
1470 static void gadgets_drop(struct config_group *group, struct config_item *item)
1471 {
1472 config_item_put(item);
1473 }
1474
1475 static struct configfs_group_operations gadgets_ops = {
1476 .make_group = &gadgets_make,
1477 .drop_item = &gadgets_drop,
1478 };
1479
1480 static struct config_item_type gadgets_type = {
1481 .ct_group_ops = &gadgets_ops,
1482 .ct_owner = THIS_MODULE,
1483 };
1484
1485 static struct configfs_subsystem gadget_subsys = {
1486 .su_group = {
1487 .cg_item = {
1488 .ci_namebuf = "usb_gadget",
1489 .ci_type = &gadgets_type,
1490 },
1491 },
1492 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1493 };
1494
1495 void unregister_gadget_item(struct config_item *item)
1496 {
1497 struct gadget_info *gi = to_gadget_info(item);
1498
1499 unregister_gadget(gi);
1500 }
1501 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1502
1503 static int __init gadget_cfs_init(void)
1504 {
1505 int ret;
1506
1507 config_group_init(&gadget_subsys.su_group);
1508
1509 ret = configfs_register_subsystem(&gadget_subsys);
1510 return ret;
1511 }
1512 module_init(gadget_cfs_init);
1513
1514 static void __exit gadget_cfs_exit(void)
1515 {
1516 configfs_unregister_subsystem(&gadget_subsys);
1517 }
1518 module_exit(gadget_cfs_exit);
Linux with added FPC-III support