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