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configfs: switch ->default groups to a linked list
[deliverable/linux.git] / drivers / usb / gadget / configfs.c
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
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
65 static 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
70 struct 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
79 static 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
85 struct 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
96 struct os_desc {
97 struct config_group group;
98 };
99
100 struct 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
109 static 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) \
129 static 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) \
137 static 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) \
146 static 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) \
159 static 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
175 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
176 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
177 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
178 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
179 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
180 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
181 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
182 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
183
184 static 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
197 static 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
214 static 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
231 static 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
238 static 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
253 static 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;
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->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
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 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;
679 err:
680 kfree(cfg->c.label);
681 kfree(cfg);
682 return ERR_PTR(ret);
683 }
684
685 static void config_desc_drop(
686 struct config_group *group,
687 struct config_item *item)
688 {
689 config_item_put(item);
690 }
691
692 static struct configfs_group_operations config_desc_ops = {
693 .make_group = &config_desc_make,
694 .drop_item = &config_desc_drop,
695 };
696
697 static struct config_item_type config_desc_type = {
698 .ct_group_ops = &config_desc_ops,
699 .ct_owner = THIS_MODULE,
700 };
701
702 GS_STRINGS_RW(gadget_strings, manufacturer);
703 GS_STRINGS_RW(gadget_strings, product);
704 GS_STRINGS_RW(gadget_strings, serialnumber);
705
706 static 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
713 static 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
725 USB_CONFIG_STRING_RW_OPS(gadget_strings);
726 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
727
728 static 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
733 static 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
739 static 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
745 static 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
763 static 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
769 static 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
787 static 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
795 static 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
816 CONFIGFS_ATTR(os_desc_, use);
817 CONFIGFS_ATTR(os_desc_, b_vendor_code);
818 CONFIGFS_ATTR(os_desc_, qw_sign);
819
820 static 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
827 static 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
833 static 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
863 out:
864 mutex_unlock(&gi->lock);
865 return ret;
866 }
867
868 static 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
884 static 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
890 static 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
896 static 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
902 static 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
907 static 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
942 end:
943 if (desc->opts_mutex)
944 mutex_unlock(desc->opts_mutex);
945 return ret;
946 }
947
948 static 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
962 static 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
996 CONFIGFS_ATTR(ext_prop_, type);
997 CONFIGFS_ATTR(ext_prop_, data);
998
999 static struct configfs_attribute *ext_prop_attrs[] = {
1000 &ext_prop_attr_type,
1001 &ext_prop_attr_data,
1002 NULL,
1003 };
1004
1005 static 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
1012 static struct configfs_item_operations ext_prop_ops = {
1013 .release = usb_os_desc_ext_prop_release,
1014 };
1015
1016 static 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
1061 static 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
1077 static struct configfs_group_operations interf_grp_ops = {
1078 .make_item = &ext_prop_make,
1079 .drop_item = &ext_prop_drop,
1080 };
1081
1082 static 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
1089 static 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
1108 static 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
1115 static 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
1134 CONFIGFS_ATTR(interf_grp_, compatible_id);
1135 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1136
1137 static struct configfs_attribute *interf_grp_attrs[] = {
1138 &interf_grp_attr_compatible_id,
1139 &interf_grp_attr_sub_compatible_id,
1140 NULL
1141 };
1142
1143 int 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 }
1186 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1187
1188 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1189 {
1190 WARN_ON(1);
1191 return -EINVAL;
1192 }
1193
1194 int composite_dev_prepare(struct usb_composite_driver *composite,
1195 struct usb_composite_dev *dev);
1196
1197 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1198 struct usb_ep *ep0);
1199
1200 static 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 = 0;
1222 c->highspeed = 0;
1223 c->fullspeed = 0;
1224 }
1225 }
1226
1227 static int configfs_composite_bind(struct usb_gadget *gadget,
1228 struct usb_gadget_driver *gdriver)
1229 {
1230 struct usb_composite_driver *composite = to_cdriver(gdriver);
1231 struct gadget_info *gi = container_of(composite,
1232 struct gadget_info, composite);
1233 struct usb_composite_dev *cdev = &gi->cdev;
1234 struct usb_configuration *c;
1235 struct usb_string *s;
1236 unsigned i;
1237 int ret;
1238
1239 /* the gi->lock is hold by the caller */
1240 cdev->gadget = gadget;
1241 set_gadget_data(gadget, cdev);
1242 ret = composite_dev_prepare(composite, cdev);
1243 if (ret)
1244 return ret;
1245 /* and now the gadget bind */
1246 ret = -EINVAL;
1247
1248 if (list_empty(&gi->cdev.configs)) {
1249 pr_err("Need at least one configuration in %s.\n",
1250 gi->composite.name);
1251 goto err_comp_cleanup;
1252 }
1253
1254
1255 list_for_each_entry(c, &gi->cdev.configs, list) {
1256 struct config_usb_cfg *cfg;
1257
1258 cfg = container_of(c, struct config_usb_cfg, c);
1259 if (list_empty(&cfg->func_list)) {
1260 pr_err("Config %s/%d of %s needs at least one function.\n",
1261 c->label, c->bConfigurationValue,
1262 gi->composite.name);
1263 goto err_comp_cleanup;
1264 }
1265 }
1266
1267 /* init all strings */
1268 if (!list_empty(&gi->string_list)) {
1269 struct gadget_strings *gs;
1270
1271 i = 0;
1272 list_for_each_entry(gs, &gi->string_list, list) {
1273
1274 gi->gstrings[i] = &gs->stringtab_dev;
1275 gs->stringtab_dev.strings = gs->strings;
1276 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1277 gs->manufacturer;
1278 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1279 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1280 i++;
1281 }
1282 gi->gstrings[i] = NULL;
1283 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1284 USB_GADGET_FIRST_AVAIL_IDX);
1285 if (IS_ERR(s)) {
1286 ret = PTR_ERR(s);
1287 goto err_comp_cleanup;
1288 }
1289
1290 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1291 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1292 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1293 }
1294
1295 if (gi->use_os_desc) {
1296 cdev->use_os_string = true;
1297 cdev->b_vendor_code = gi->b_vendor_code;
1298 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1299 }
1300
1301 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1302 struct usb_descriptor_header *usb_desc;
1303
1304 usb_desc = usb_otg_descriptor_alloc(gadget);
1305 if (!usb_desc) {
1306 ret = -ENOMEM;
1307 goto err_comp_cleanup;
1308 }
1309 usb_otg_descriptor_init(gadget, usb_desc);
1310 otg_desc[0] = usb_desc;
1311 otg_desc[1] = NULL;
1312 }
1313
1314 /* Go through all configs, attach all functions */
1315 list_for_each_entry(c, &gi->cdev.configs, list) {
1316 struct config_usb_cfg *cfg;
1317 struct usb_function *f;
1318 struct usb_function *tmp;
1319 struct gadget_config_name *cn;
1320
1321 if (gadget_is_otg(gadget))
1322 c->descriptors = otg_desc;
1323
1324 cfg = container_of(c, struct config_usb_cfg, c);
1325 if (!list_empty(&cfg->string_list)) {
1326 i = 0;
1327 list_for_each_entry(cn, &cfg->string_list, list) {
1328 cfg->gstrings[i] = &cn->stringtab_dev;
1329 cn->stringtab_dev.strings = &cn->strings;
1330 cn->strings.s = cn->configuration;
1331 i++;
1332 }
1333 cfg->gstrings[i] = NULL;
1334 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1335 if (IS_ERR(s)) {
1336 ret = PTR_ERR(s);
1337 goto err_comp_cleanup;
1338 }
1339 c->iConfiguration = s[0].id;
1340 }
1341
1342 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1343 list_del(&f->list);
1344 ret = usb_add_function(c, f);
1345 if (ret) {
1346 list_add(&f->list, &cfg->func_list);
1347 goto err_purge_funcs;
1348 }
1349 }
1350 usb_ep_autoconfig_reset(cdev->gadget);
1351 }
1352 if (cdev->use_os_string) {
1353 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1354 if (ret)
1355 goto err_purge_funcs;
1356 }
1357
1358 usb_ep_autoconfig_reset(cdev->gadget);
1359 return 0;
1360
1361 err_purge_funcs:
1362 purge_configs_funcs(gi);
1363 err_comp_cleanup:
1364 composite_dev_cleanup(cdev);
1365 return ret;
1366 }
1367
1368 static void configfs_composite_unbind(struct usb_gadget *gadget)
1369 {
1370 struct usb_composite_dev *cdev;
1371 struct gadget_info *gi;
1372
1373 /* the gi->lock is hold by the caller */
1374
1375 cdev = get_gadget_data(gadget);
1376 gi = container_of(cdev, struct gadget_info, cdev);
1377
1378 kfree(otg_desc[0]);
1379 otg_desc[0] = NULL;
1380 purge_configs_funcs(gi);
1381 composite_dev_cleanup(cdev);
1382 usb_ep_autoconfig_reset(cdev->gadget);
1383 cdev->gadget = NULL;
1384 set_gadget_data(gadget, NULL);
1385 }
1386
1387 static const struct usb_gadget_driver configfs_driver_template = {
1388 .bind = configfs_composite_bind,
1389 .unbind = configfs_composite_unbind,
1390
1391 .setup = composite_setup,
1392 .reset = composite_disconnect,
1393 .disconnect = composite_disconnect,
1394
1395 .suspend = composite_suspend,
1396 .resume = composite_resume,
1397
1398 .max_speed = USB_SPEED_SUPER,
1399 .driver = {
1400 .owner = THIS_MODULE,
1401 .name = "configfs-gadget",
1402 },
1403 };
1404
1405 static struct config_group *gadgets_make(
1406 struct config_group *group,
1407 const char *name)
1408 {
1409 struct gadget_info *gi;
1410
1411 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1412 if (!gi)
1413 return ERR_PTR(-ENOMEM);
1414
1415 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1416
1417 config_group_init_type_name(&gi->functions_group, "functions",
1418 &functions_type);
1419 configfs_add_default_group(&gi->functions_group, &gi->group);
1420
1421 config_group_init_type_name(&gi->configs_group, "configs",
1422 &config_desc_type);
1423 configfs_add_default_group(&gi->configs_group, &gi->group);
1424
1425 config_group_init_type_name(&gi->strings_group, "strings",
1426 &gadget_strings_strings_type);
1427 configfs_add_default_group(&gi->strings_group, &gi->group);
1428
1429 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1430 &os_desc_type);
1431 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1432
1433 gi->composite.bind = configfs_do_nothing;
1434 gi->composite.unbind = configfs_do_nothing;
1435 gi->composite.suspend = NULL;
1436 gi->composite.resume = NULL;
1437 gi->composite.max_speed = USB_SPEED_SUPER;
1438
1439 mutex_init(&gi->lock);
1440 INIT_LIST_HEAD(&gi->string_list);
1441 INIT_LIST_HEAD(&gi->available_func);
1442
1443 composite_init_dev(&gi->cdev);
1444 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1445 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1446 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1447
1448 gi->composite.gadget_driver = configfs_driver_template;
1449
1450 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1451 gi->composite.name = gi->composite.gadget_driver.function;
1452
1453 if (!gi->composite.gadget_driver.function)
1454 goto err;
1455
1456 return &gi->group;
1457 err:
1458 kfree(gi);
1459 return ERR_PTR(-ENOMEM);
1460 }
1461
1462 static void gadgets_drop(struct config_group *group, struct config_item *item)
1463 {
1464 config_item_put(item);
1465 }
1466
1467 static struct configfs_group_operations gadgets_ops = {
1468 .make_group = &gadgets_make,
1469 .drop_item = &gadgets_drop,
1470 };
1471
1472 static struct config_item_type gadgets_type = {
1473 .ct_group_ops = &gadgets_ops,
1474 .ct_owner = THIS_MODULE,
1475 };
1476
1477 static struct configfs_subsystem gadget_subsys = {
1478 .su_group = {
1479 .cg_item = {
1480 .ci_namebuf = "usb_gadget",
1481 .ci_type = &gadgets_type,
1482 },
1483 },
1484 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1485 };
1486
1487 void unregister_gadget_item(struct config_item *item)
1488 {
1489 struct gadget_info *gi = to_gadget_info(item);
1490
1491 unregister_gadget(gi);
1492 }
1493 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1494
1495 static int __init gadget_cfs_init(void)
1496 {
1497 int ret;
1498
1499 config_group_init(&gadget_subsys.su_group);
1500
1501 ret = configfs_register_subsystem(&gadget_subsys);
1502 return ret;
1503 }
1504 module_init(gadget_cfs_init);
1505
1506 static void __exit gadget_cfs_exit(void)
1507 {
1508 configfs_unregister_subsystem(&gadget_subsys);
1509 }
1510 module_exit(gadget_cfs_exit);
Linux kernel - Deliverables
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