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