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