Loading...
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/configfs.h>
3#include <linux/module.h>
4#include <linux/slab.h>
5#include <linux/device.h>
6#include <linux/kstrtox.h>
7#include <linux/nls.h>
8#include <linux/usb/composite.h>
9#include <linux/usb/gadget_configfs.h>
10#include "configfs.h"
11#include "u_f.h"
12#include "u_os_desc.h"
13
14int check_user_usb_string(const char *name,
15 struct usb_gadget_strings *stringtab_dev)
16{
17 u16 num;
18 int ret;
19
20 ret = kstrtou16(name, 0, &num);
21 if (ret)
22 return ret;
23
24 if (!usb_validate_langid(num))
25 return -EINVAL;
26
27 stringtab_dev->language = num;
28 return 0;
29}
30
31#define MAX_NAME_LEN 40
32#define MAX_USB_STRING_LANGS 2
33
34static const struct usb_descriptor_header *otg_desc[2];
35
36struct gadget_info {
37 struct config_group group;
38 struct config_group functions_group;
39 struct config_group configs_group;
40 struct config_group strings_group;
41 struct config_group os_desc_group;
42
43 struct mutex lock;
44 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
45 struct list_head string_list;
46 struct list_head available_func;
47
48 struct usb_composite_driver composite;
49 struct usb_composite_dev cdev;
50 bool use_os_desc;
51 char b_vendor_code;
52 char qw_sign[OS_STRING_QW_SIGN_LEN];
53 spinlock_t spinlock;
54 bool unbind;
55};
56
57static inline struct gadget_info *to_gadget_info(struct config_item *item)
58{
59 return container_of(to_config_group(item), struct gadget_info, group);
60}
61
62struct config_usb_cfg {
63 struct config_group group;
64 struct config_group strings_group;
65 struct list_head string_list;
66 struct usb_configuration c;
67 struct list_head func_list;
68 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
69};
70
71static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
72{
73 return container_of(to_config_group(item), struct config_usb_cfg,
74 group);
75}
76
77static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg)
78{
79 return container_of(cfg->c.cdev, struct gadget_info, cdev);
80}
81
82struct gadget_strings {
83 struct usb_gadget_strings stringtab_dev;
84 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
85 char *manufacturer;
86 char *product;
87 char *serialnumber;
88
89 struct config_group group;
90 struct list_head list;
91};
92
93struct gadget_config_name {
94 struct usb_gadget_strings stringtab_dev;
95 struct usb_string strings;
96 char *configuration;
97
98 struct config_group group;
99 struct list_head list;
100};
101
102#define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1)
103
104static int usb_string_copy(const char *s, char **s_copy)
105{
106 int ret;
107 char *str;
108 char *copy = *s_copy;
109 ret = strlen(s);
110 if (ret > USB_MAX_STRING_LEN)
111 return -EOVERFLOW;
112
113 if (copy) {
114 str = copy;
115 } else {
116 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
117 if (!str)
118 return -ENOMEM;
119 }
120 strcpy(str, s);
121 if (str[ret - 1] == '\n')
122 str[ret - 1] = '\0';
123 *s_copy = str;
124 return 0;
125}
126
127#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
128static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
129 char *page) \
130{ \
131 return sprintf(page, "0x%02x\n", \
132 to_gadget_info(item)->cdev.desc.__name); \
133}
134
135#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
136static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
137 char *page) \
138{ \
139 return sprintf(page, "0x%04x\n", \
140 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
141}
142
143
144#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
145static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
146 const char *page, size_t len) \
147{ \
148 u8 val; \
149 int ret; \
150 ret = kstrtou8(page, 0, &val); \
151 if (ret) \
152 return ret; \
153 to_gadget_info(item)->cdev.desc._name = val; \
154 return len; \
155}
156
157#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
158static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
159 const char *page, size_t len) \
160{ \
161 u16 val; \
162 int ret; \
163 ret = kstrtou16(page, 0, &val); \
164 if (ret) \
165 return ret; \
166 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
167 return len; \
168}
169
170#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
171 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
172 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
173
174GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
175GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
176GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
177GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
178GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
179GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
180GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
181GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
182
183static ssize_t is_valid_bcd(u16 bcd_val)
184{
185 if ((bcd_val & 0xf) > 9)
186 return -EINVAL;
187 if (((bcd_val >> 4) & 0xf) > 9)
188 return -EINVAL;
189 if (((bcd_val >> 8) & 0xf) > 9)
190 return -EINVAL;
191 if (((bcd_val >> 12) & 0xf) > 9)
192 return -EINVAL;
193 return 0;
194}
195
196static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
197 const char *page, size_t len)
198{
199 u16 bcdDevice;
200 int ret;
201
202 ret = kstrtou16(page, 0, &bcdDevice);
203 if (ret)
204 return ret;
205 ret = is_valid_bcd(bcdDevice);
206 if (ret)
207 return ret;
208
209 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
210 return len;
211}
212
213static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
214 const char *page, size_t len)
215{
216 u16 bcdUSB;
217 int ret;
218
219 ret = kstrtou16(page, 0, &bcdUSB);
220 if (ret)
221 return ret;
222 ret = is_valid_bcd(bcdUSB);
223 if (ret)
224 return ret;
225
226 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
227 return len;
228}
229
230static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
231{
232 struct gadget_info *gi = to_gadget_info(item);
233 char *udc_name;
234 int ret;
235
236 mutex_lock(&gi->lock);
237 udc_name = gi->composite.gadget_driver.udc_name;
238 ret = sprintf(page, "%s\n", udc_name ?: "");
239 mutex_unlock(&gi->lock);
240
241 return ret;
242}
243
244static int unregister_gadget(struct gadget_info *gi)
245{
246 int ret;
247
248 if (!gi->composite.gadget_driver.udc_name)
249 return -ENODEV;
250
251 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
252 if (ret)
253 return ret;
254 kfree(gi->composite.gadget_driver.udc_name);
255 gi->composite.gadget_driver.udc_name = NULL;
256 return 0;
257}
258
259static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
260 const char *page, size_t len)
261{
262 struct gadget_info *gi = to_gadget_info(item);
263 char *name;
264 int ret;
265
266 if (strlen(page) < len)
267 return -EOVERFLOW;
268
269 name = kstrdup(page, GFP_KERNEL);
270 if (!name)
271 return -ENOMEM;
272 if (name[len - 1] == '\n')
273 name[len - 1] = '\0';
274
275 mutex_lock(&gi->lock);
276
277 if (!strlen(name)) {
278 ret = unregister_gadget(gi);
279 if (ret)
280 goto err;
281 kfree(name);
282 } else {
283 if (gi->composite.gadget_driver.udc_name) {
284 ret = -EBUSY;
285 goto err;
286 }
287 gi->composite.gadget_driver.udc_name = name;
288 ret = usb_gadget_register_driver(&gi->composite.gadget_driver);
289 if (ret) {
290 gi->composite.gadget_driver.udc_name = NULL;
291 goto err;
292 }
293 }
294 mutex_unlock(&gi->lock);
295 return len;
296err:
297 kfree(name);
298 mutex_unlock(&gi->lock);
299 return ret;
300}
301
302static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
303 char *page)
304{
305 enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
306
307 return sprintf(page, "%s\n", usb_speed_string(speed));
308}
309
310static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
311 const char *page, size_t len)
312{
313 struct gadget_info *gi = to_gadget_info(item);
314
315 mutex_lock(&gi->lock);
316
317 /* Prevent changing of max_speed after the driver is binded */
318 if (gi->composite.gadget_driver.udc_name)
319 goto err;
320
321 if (strncmp(page, "super-speed-plus", 16) == 0)
322 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
323 else if (strncmp(page, "super-speed", 11) == 0)
324 gi->composite.max_speed = USB_SPEED_SUPER;
325 else if (strncmp(page, "high-speed", 10) == 0)
326 gi->composite.max_speed = USB_SPEED_HIGH;
327 else if (strncmp(page, "full-speed", 10) == 0)
328 gi->composite.max_speed = USB_SPEED_FULL;
329 else if (strncmp(page, "low-speed", 9) == 0)
330 gi->composite.max_speed = USB_SPEED_LOW;
331 else
332 goto err;
333
334 gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
335
336 mutex_unlock(&gi->lock);
337 return len;
338err:
339 mutex_unlock(&gi->lock);
340 return -EINVAL;
341}
342
343CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
344CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
345CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
346CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
347CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
348CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
349CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
350CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
351CONFIGFS_ATTR(gadget_dev_desc_, UDC);
352CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
353
354static struct configfs_attribute *gadget_root_attrs[] = {
355 &gadget_dev_desc_attr_bDeviceClass,
356 &gadget_dev_desc_attr_bDeviceSubClass,
357 &gadget_dev_desc_attr_bDeviceProtocol,
358 &gadget_dev_desc_attr_bMaxPacketSize0,
359 &gadget_dev_desc_attr_idVendor,
360 &gadget_dev_desc_attr_idProduct,
361 &gadget_dev_desc_attr_bcdDevice,
362 &gadget_dev_desc_attr_bcdUSB,
363 &gadget_dev_desc_attr_UDC,
364 &gadget_dev_desc_attr_max_speed,
365 NULL,
366};
367
368static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
369{
370 return container_of(to_config_group(item), struct gadget_strings,
371 group);
372}
373
374static inline struct gadget_config_name *to_gadget_config_name(
375 struct config_item *item)
376{
377 return container_of(to_config_group(item), struct gadget_config_name,
378 group);
379}
380
381static inline struct usb_function_instance *to_usb_function_instance(
382 struct config_item *item)
383{
384 return container_of(to_config_group(item),
385 struct usb_function_instance, group);
386}
387
388static void gadget_info_attr_release(struct config_item *item)
389{
390 struct gadget_info *gi = to_gadget_info(item);
391
392 WARN_ON(!list_empty(&gi->cdev.configs));
393 WARN_ON(!list_empty(&gi->string_list));
394 WARN_ON(!list_empty(&gi->available_func));
395 kfree(gi->composite.gadget_driver.function);
396 kfree(gi->composite.gadget_driver.driver.name);
397 kfree(gi);
398}
399
400static struct configfs_item_operations gadget_root_item_ops = {
401 .release = gadget_info_attr_release,
402};
403
404static void gadget_config_attr_release(struct config_item *item)
405{
406 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
407
408 WARN_ON(!list_empty(&cfg->c.functions));
409 list_del(&cfg->c.list);
410 kfree(cfg->c.label);
411 kfree(cfg);
412}
413
414static int config_usb_cfg_link(
415 struct config_item *usb_cfg_ci,
416 struct config_item *usb_func_ci)
417{
418 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
419 struct gadget_info *gi = cfg_to_gadget_info(cfg);
420
421 struct usb_function_instance *fi =
422 to_usb_function_instance(usb_func_ci);
423 struct usb_function_instance *a_fi = NULL, *iter;
424 struct usb_function *f;
425 int ret;
426
427 mutex_lock(&gi->lock);
428 /*
429 * Make sure this function is from within our _this_ gadget and not
430 * from another gadget or a random directory.
431 * Also a function instance can only be linked once.
432 */
433 list_for_each_entry(iter, &gi->available_func, cfs_list) {
434 if (iter != fi)
435 continue;
436 a_fi = iter;
437 break;
438 }
439 if (!a_fi) {
440 ret = -EINVAL;
441 goto out;
442 }
443
444 list_for_each_entry(f, &cfg->func_list, list) {
445 if (f->fi == fi) {
446 ret = -EEXIST;
447 goto out;
448 }
449 }
450
451 f = usb_get_function(fi);
452 if (IS_ERR(f)) {
453 ret = PTR_ERR(f);
454 goto out;
455 }
456
457 /* stash the function until we bind it to the gadget */
458 list_add_tail(&f->list, &cfg->func_list);
459 ret = 0;
460out:
461 mutex_unlock(&gi->lock);
462 return ret;
463}
464
465static void config_usb_cfg_unlink(
466 struct config_item *usb_cfg_ci,
467 struct config_item *usb_func_ci)
468{
469 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
470 struct gadget_info *gi = cfg_to_gadget_info(cfg);
471
472 struct usb_function_instance *fi =
473 to_usb_function_instance(usb_func_ci);
474 struct usb_function *f;
475
476 /*
477 * ideally I would like to forbid to unlink functions while a gadget is
478 * bound to an UDC. Since this isn't possible at the moment, we simply
479 * force an unbind, the function is available here and then we can
480 * remove the function.
481 */
482 mutex_lock(&gi->lock);
483 if (gi->composite.gadget_driver.udc_name)
484 unregister_gadget(gi);
485 WARN_ON(gi->composite.gadget_driver.udc_name);
486
487 list_for_each_entry(f, &cfg->func_list, list) {
488 if (f->fi == fi) {
489 list_del(&f->list);
490 usb_put_function(f);
491 mutex_unlock(&gi->lock);
492 return;
493 }
494 }
495 mutex_unlock(&gi->lock);
496 WARN(1, "Unable to locate function to unbind\n");
497}
498
499static struct configfs_item_operations gadget_config_item_ops = {
500 .release = gadget_config_attr_release,
501 .allow_link = config_usb_cfg_link,
502 .drop_link = config_usb_cfg_unlink,
503};
504
505
506static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
507 char *page)
508{
509 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
510
511 return sprintf(page, "%u\n", cfg->c.MaxPower);
512}
513
514static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
515 const char *page, size_t len)
516{
517 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
518 u16 val;
519 int ret;
520 ret = kstrtou16(page, 0, &val);
521 if (ret)
522 return ret;
523 if (DIV_ROUND_UP(val, 8) > 0xff)
524 return -ERANGE;
525 cfg->c.MaxPower = val;
526 return len;
527}
528
529static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
530 char *page)
531{
532 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
533
534 return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
535}
536
537static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
538 const char *page, size_t len)
539{
540 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
541 u8 val;
542 int ret;
543 ret = kstrtou8(page, 0, &val);
544 if (ret)
545 return ret;
546 if (!(val & USB_CONFIG_ATT_ONE))
547 return -EINVAL;
548 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
549 USB_CONFIG_ATT_WAKEUP))
550 return -EINVAL;
551 cfg->c.bmAttributes = val;
552 return len;
553}
554
555CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
556CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
557
558static struct configfs_attribute *gadget_config_attrs[] = {
559 &gadget_config_desc_attr_MaxPower,
560 &gadget_config_desc_attr_bmAttributes,
561 NULL,
562};
563
564static const struct config_item_type gadget_config_type = {
565 .ct_item_ops = &gadget_config_item_ops,
566 .ct_attrs = gadget_config_attrs,
567 .ct_owner = THIS_MODULE,
568};
569
570static const struct config_item_type gadget_root_type = {
571 .ct_item_ops = &gadget_root_item_ops,
572 .ct_attrs = gadget_root_attrs,
573 .ct_owner = THIS_MODULE,
574};
575
576static void composite_init_dev(struct usb_composite_dev *cdev)
577{
578 spin_lock_init(&cdev->lock);
579 INIT_LIST_HEAD(&cdev->configs);
580 INIT_LIST_HEAD(&cdev->gstrings);
581}
582
583static struct config_group *function_make(
584 struct config_group *group,
585 const char *name)
586{
587 struct gadget_info *gi;
588 struct usb_function_instance *fi;
589 char buf[MAX_NAME_LEN];
590 char *func_name;
591 char *instance_name;
592 int ret;
593
594 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
595 if (ret >= MAX_NAME_LEN)
596 return ERR_PTR(-ENAMETOOLONG);
597
598 func_name = buf;
599 instance_name = strchr(func_name, '.');
600 if (!instance_name) {
601 pr_err("Unable to locate . in FUNC.INSTANCE\n");
602 return ERR_PTR(-EINVAL);
603 }
604 *instance_name = '\0';
605 instance_name++;
606
607 fi = usb_get_function_instance(func_name);
608 if (IS_ERR(fi))
609 return ERR_CAST(fi);
610
611 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
612 if (ret) {
613 usb_put_function_instance(fi);
614 return ERR_PTR(ret);
615 }
616 if (fi->set_inst_name) {
617 ret = fi->set_inst_name(fi, instance_name);
618 if (ret) {
619 usb_put_function_instance(fi);
620 return ERR_PTR(ret);
621 }
622 }
623
624 gi = container_of(group, struct gadget_info, functions_group);
625
626 mutex_lock(&gi->lock);
627 list_add_tail(&fi->cfs_list, &gi->available_func);
628 mutex_unlock(&gi->lock);
629 return &fi->group;
630}
631
632static void function_drop(
633 struct config_group *group,
634 struct config_item *item)
635{
636 struct usb_function_instance *fi = to_usb_function_instance(item);
637 struct gadget_info *gi;
638
639 gi = container_of(group, struct gadget_info, functions_group);
640
641 mutex_lock(&gi->lock);
642 list_del(&fi->cfs_list);
643 mutex_unlock(&gi->lock);
644 config_item_put(item);
645}
646
647static struct configfs_group_operations functions_ops = {
648 .make_group = &function_make,
649 .drop_item = &function_drop,
650};
651
652static const struct config_item_type functions_type = {
653 .ct_group_ops = &functions_ops,
654 .ct_owner = THIS_MODULE,
655};
656
657GS_STRINGS_RW(gadget_config_name, configuration);
658
659static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
660 &gadget_config_name_attr_configuration,
661 NULL,
662};
663
664static void gadget_config_name_attr_release(struct config_item *item)
665{
666 struct gadget_config_name *cn = to_gadget_config_name(item);
667
668 kfree(cn->configuration);
669
670 list_del(&cn->list);
671 kfree(cn);
672}
673
674USB_CONFIG_STRING_RW_OPS(gadget_config_name);
675USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
676
677static struct config_group *config_desc_make(
678 struct config_group *group,
679 const char *name)
680{
681 struct gadget_info *gi;
682 struct config_usb_cfg *cfg;
683 char buf[MAX_NAME_LEN];
684 char *num_str;
685 u8 num;
686 int ret;
687
688 gi = container_of(group, struct gadget_info, configs_group);
689 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
690 if (ret >= MAX_NAME_LEN)
691 return ERR_PTR(-ENAMETOOLONG);
692
693 num_str = strchr(buf, '.');
694 if (!num_str) {
695 pr_err("Unable to locate . in name.bConfigurationValue\n");
696 return ERR_PTR(-EINVAL);
697 }
698
699 *num_str = '\0';
700 num_str++;
701
702 if (!strlen(buf))
703 return ERR_PTR(-EINVAL);
704
705 ret = kstrtou8(num_str, 0, &num);
706 if (ret)
707 return ERR_PTR(ret);
708
709 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
710 if (!cfg)
711 return ERR_PTR(-ENOMEM);
712 cfg->c.label = kstrdup(buf, GFP_KERNEL);
713 if (!cfg->c.label) {
714 ret = -ENOMEM;
715 goto err;
716 }
717 cfg->c.bConfigurationValue = num;
718 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
719 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
720 INIT_LIST_HEAD(&cfg->string_list);
721 INIT_LIST_HEAD(&cfg->func_list);
722
723 config_group_init_type_name(&cfg->group, name,
724 &gadget_config_type);
725
726 config_group_init_type_name(&cfg->strings_group, "strings",
727 &gadget_config_name_strings_type);
728 configfs_add_default_group(&cfg->strings_group, &cfg->group);
729
730 ret = usb_add_config_only(&gi->cdev, &cfg->c);
731 if (ret)
732 goto err;
733
734 return &cfg->group;
735err:
736 kfree(cfg->c.label);
737 kfree(cfg);
738 return ERR_PTR(ret);
739}
740
741static void config_desc_drop(
742 struct config_group *group,
743 struct config_item *item)
744{
745 config_item_put(item);
746}
747
748static struct configfs_group_operations config_desc_ops = {
749 .make_group = &config_desc_make,
750 .drop_item = &config_desc_drop,
751};
752
753static const struct config_item_type config_desc_type = {
754 .ct_group_ops = &config_desc_ops,
755 .ct_owner = THIS_MODULE,
756};
757
758GS_STRINGS_RW(gadget_strings, manufacturer);
759GS_STRINGS_RW(gadget_strings, product);
760GS_STRINGS_RW(gadget_strings, serialnumber);
761
762static struct configfs_attribute *gadget_strings_langid_attrs[] = {
763 &gadget_strings_attr_manufacturer,
764 &gadget_strings_attr_product,
765 &gadget_strings_attr_serialnumber,
766 NULL,
767};
768
769static void gadget_strings_attr_release(struct config_item *item)
770{
771 struct gadget_strings *gs = to_gadget_strings(item);
772
773 kfree(gs->manufacturer);
774 kfree(gs->product);
775 kfree(gs->serialnumber);
776
777 list_del(&gs->list);
778 kfree(gs);
779}
780
781USB_CONFIG_STRING_RW_OPS(gadget_strings);
782USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
783
784static inline struct gadget_info *os_desc_item_to_gadget_info(
785 struct config_item *item)
786{
787 return container_of(to_config_group(item),
788 struct gadget_info, os_desc_group);
789}
790
791static ssize_t os_desc_use_show(struct config_item *item, char *page)
792{
793 return sprintf(page, "%d\n",
794 os_desc_item_to_gadget_info(item)->use_os_desc);
795}
796
797static ssize_t os_desc_use_store(struct config_item *item, const char *page,
798 size_t len)
799{
800 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
801 int ret;
802 bool use;
803
804 mutex_lock(&gi->lock);
805 ret = kstrtobool(page, &use);
806 if (!ret) {
807 gi->use_os_desc = use;
808 ret = len;
809 }
810 mutex_unlock(&gi->lock);
811
812 return ret;
813}
814
815static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
816{
817 return sprintf(page, "0x%02x\n",
818 os_desc_item_to_gadget_info(item)->b_vendor_code);
819}
820
821static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
822 const char *page, size_t len)
823{
824 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
825 int ret;
826 u8 b_vendor_code;
827
828 mutex_lock(&gi->lock);
829 ret = kstrtou8(page, 0, &b_vendor_code);
830 if (!ret) {
831 gi->b_vendor_code = b_vendor_code;
832 ret = len;
833 }
834 mutex_unlock(&gi->lock);
835
836 return ret;
837}
838
839static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
840{
841 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
842 int res;
843
844 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
845 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
846 page[res++] = '\n';
847
848 return res;
849}
850
851static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
852 size_t len)
853{
854 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
855 int res, l;
856
857 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
858 if (page[l - 1] == '\n')
859 --l;
860
861 mutex_lock(&gi->lock);
862 res = utf8s_to_utf16s(page, l,
863 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
864 OS_STRING_QW_SIGN_LEN);
865 if (res > 0)
866 res = len;
867 mutex_unlock(&gi->lock);
868
869 return res;
870}
871
872CONFIGFS_ATTR(os_desc_, use);
873CONFIGFS_ATTR(os_desc_, b_vendor_code);
874CONFIGFS_ATTR(os_desc_, qw_sign);
875
876static struct configfs_attribute *os_desc_attrs[] = {
877 &os_desc_attr_use,
878 &os_desc_attr_b_vendor_code,
879 &os_desc_attr_qw_sign,
880 NULL,
881};
882
883static int os_desc_link(struct config_item *os_desc_ci,
884 struct config_item *usb_cfg_ci)
885{
886 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
887 struct usb_composite_dev *cdev = &gi->cdev;
888 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci);
889 struct usb_configuration *c = NULL, *iter;
890 int ret;
891
892 mutex_lock(&gi->lock);
893 list_for_each_entry(iter, &cdev->configs, list) {
894 if (iter != &c_target->c)
895 continue;
896 c = iter;
897 break;
898 }
899 if (!c) {
900 ret = -EINVAL;
901 goto out;
902 }
903
904 if (cdev->os_desc_config) {
905 ret = -EBUSY;
906 goto out;
907 }
908
909 cdev->os_desc_config = &c_target->c;
910 ret = 0;
911
912out:
913 mutex_unlock(&gi->lock);
914 return ret;
915}
916
917static void os_desc_unlink(struct config_item *os_desc_ci,
918 struct config_item *usb_cfg_ci)
919{
920 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
921 struct usb_composite_dev *cdev = &gi->cdev;
922
923 mutex_lock(&gi->lock);
924 if (gi->composite.gadget_driver.udc_name)
925 unregister_gadget(gi);
926 cdev->os_desc_config = NULL;
927 WARN_ON(gi->composite.gadget_driver.udc_name);
928 mutex_unlock(&gi->lock);
929}
930
931static struct configfs_item_operations os_desc_ops = {
932 .allow_link = os_desc_link,
933 .drop_link = os_desc_unlink,
934};
935
936static struct config_item_type os_desc_type = {
937 .ct_item_ops = &os_desc_ops,
938 .ct_attrs = os_desc_attrs,
939 .ct_owner = THIS_MODULE,
940};
941
942static inline struct usb_os_desc_ext_prop
943*to_usb_os_desc_ext_prop(struct config_item *item)
944{
945 return container_of(item, struct usb_os_desc_ext_prop, item);
946}
947
948static ssize_t ext_prop_type_show(struct config_item *item, char *page)
949{
950 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
951}
952
953static ssize_t ext_prop_type_store(struct config_item *item,
954 const char *page, size_t len)
955{
956 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
957 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
958 u8 type;
959 int ret;
960
961 if (desc->opts_mutex)
962 mutex_lock(desc->opts_mutex);
963 ret = kstrtou8(page, 0, &type);
964 if (ret)
965 goto end;
966 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
967 ret = -EINVAL;
968 goto end;
969 }
970
971 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
972 ext_prop->type == USB_EXT_PROP_LE32 ||
973 ext_prop->type == USB_EXT_PROP_BE32) &&
974 (type == USB_EXT_PROP_UNICODE ||
975 type == USB_EXT_PROP_UNICODE_ENV ||
976 type == USB_EXT_PROP_UNICODE_LINK))
977 ext_prop->data_len <<= 1;
978 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
979 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
980 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
981 (type == USB_EXT_PROP_BINARY ||
982 type == USB_EXT_PROP_LE32 ||
983 type == USB_EXT_PROP_BE32))
984 ext_prop->data_len >>= 1;
985 ext_prop->type = type;
986 ret = len;
987
988end:
989 if (desc->opts_mutex)
990 mutex_unlock(desc->opts_mutex);
991 return ret;
992}
993
994static ssize_t ext_prop_data_show(struct config_item *item, char *page)
995{
996 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
997 int len = ext_prop->data_len;
998
999 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1000 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1001 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1002 len >>= 1;
1003 memcpy(page, ext_prop->data, len);
1004
1005 return len;
1006}
1007
1008static ssize_t ext_prop_data_store(struct config_item *item,
1009 const char *page, size_t len)
1010{
1011 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1012 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1013 char *new_data;
1014 size_t ret_len = len;
1015
1016 if (page[len - 1] == '\n' || page[len - 1] == '\0')
1017 --len;
1018 new_data = kmemdup(page, len, GFP_KERNEL);
1019 if (!new_data)
1020 return -ENOMEM;
1021
1022 if (desc->opts_mutex)
1023 mutex_lock(desc->opts_mutex);
1024 kfree(ext_prop->data);
1025 ext_prop->data = new_data;
1026 desc->ext_prop_len -= ext_prop->data_len;
1027 ext_prop->data_len = len;
1028 desc->ext_prop_len += ext_prop->data_len;
1029 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1030 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1031 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1032 desc->ext_prop_len -= ext_prop->data_len;
1033 ext_prop->data_len <<= 1;
1034 ext_prop->data_len += 2;
1035 desc->ext_prop_len += ext_prop->data_len;
1036 }
1037 if (desc->opts_mutex)
1038 mutex_unlock(desc->opts_mutex);
1039 return ret_len;
1040}
1041
1042CONFIGFS_ATTR(ext_prop_, type);
1043CONFIGFS_ATTR(ext_prop_, data);
1044
1045static struct configfs_attribute *ext_prop_attrs[] = {
1046 &ext_prop_attr_type,
1047 &ext_prop_attr_data,
1048 NULL,
1049};
1050
1051static void usb_os_desc_ext_prop_release(struct config_item *item)
1052{
1053 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1054
1055 kfree(ext_prop); /* frees a whole chunk */
1056}
1057
1058static struct configfs_item_operations ext_prop_ops = {
1059 .release = usb_os_desc_ext_prop_release,
1060};
1061
1062static struct config_item *ext_prop_make(
1063 struct config_group *group,
1064 const char *name)
1065{
1066 struct usb_os_desc_ext_prop *ext_prop;
1067 struct config_item_type *ext_prop_type;
1068 struct usb_os_desc *desc;
1069 char *vlabuf;
1070
1071 vla_group(data_chunk);
1072 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1073 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1074
1075 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1076 if (!vlabuf)
1077 return ERR_PTR(-ENOMEM);
1078
1079 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1080 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1081
1082 desc = container_of(group, struct usb_os_desc, group);
1083 ext_prop_type->ct_item_ops = &ext_prop_ops;
1084 ext_prop_type->ct_attrs = ext_prop_attrs;
1085 ext_prop_type->ct_owner = desc->owner;
1086
1087 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1088
1089 ext_prop->name = kstrdup(name, GFP_KERNEL);
1090 if (!ext_prop->name) {
1091 kfree(vlabuf);
1092 return ERR_PTR(-ENOMEM);
1093 }
1094 desc->ext_prop_len += 14;
1095 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1096 if (desc->opts_mutex)
1097 mutex_lock(desc->opts_mutex);
1098 desc->ext_prop_len += ext_prop->name_len;
1099 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1100 ++desc->ext_prop_count;
1101 if (desc->opts_mutex)
1102 mutex_unlock(desc->opts_mutex);
1103
1104 return &ext_prop->item;
1105}
1106
1107static void ext_prop_drop(struct config_group *group, struct config_item *item)
1108{
1109 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1110 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1111
1112 if (desc->opts_mutex)
1113 mutex_lock(desc->opts_mutex);
1114 list_del(&ext_prop->entry);
1115 --desc->ext_prop_count;
1116 kfree(ext_prop->name);
1117 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1118 if (desc->opts_mutex)
1119 mutex_unlock(desc->opts_mutex);
1120 config_item_put(item);
1121}
1122
1123static struct configfs_group_operations interf_grp_ops = {
1124 .make_item = &ext_prop_make,
1125 .drop_item = &ext_prop_drop,
1126};
1127
1128static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1129 char *page)
1130{
1131 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1132 return 8;
1133}
1134
1135static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1136 const char *page, size_t len)
1137{
1138 struct usb_os_desc *desc = to_usb_os_desc(item);
1139 int l;
1140
1141 l = min_t(int, 8, len);
1142 if (page[l - 1] == '\n')
1143 --l;
1144 if (desc->opts_mutex)
1145 mutex_lock(desc->opts_mutex);
1146 memcpy(desc->ext_compat_id, page, l);
1147
1148 if (desc->opts_mutex)
1149 mutex_unlock(desc->opts_mutex);
1150
1151 return len;
1152}
1153
1154static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1155 char *page)
1156{
1157 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1158 return 8;
1159}
1160
1161static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1162 const char *page, size_t len)
1163{
1164 struct usb_os_desc *desc = to_usb_os_desc(item);
1165 int l;
1166
1167 l = min_t(int, 8, len);
1168 if (page[l - 1] == '\n')
1169 --l;
1170 if (desc->opts_mutex)
1171 mutex_lock(desc->opts_mutex);
1172 memcpy(desc->ext_compat_id + 8, page, l);
1173
1174 if (desc->opts_mutex)
1175 mutex_unlock(desc->opts_mutex);
1176
1177 return len;
1178}
1179
1180CONFIGFS_ATTR(interf_grp_, compatible_id);
1181CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1182
1183static struct configfs_attribute *interf_grp_attrs[] = {
1184 &interf_grp_attr_compatible_id,
1185 &interf_grp_attr_sub_compatible_id,
1186 NULL
1187};
1188
1189struct config_group *usb_os_desc_prepare_interf_dir(
1190 struct config_group *parent,
1191 int n_interf,
1192 struct usb_os_desc **desc,
1193 char **names,
1194 struct module *owner)
1195{
1196 struct config_group *os_desc_group;
1197 struct config_item_type *os_desc_type, *interface_type;
1198
1199 vla_group(data_chunk);
1200 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1201 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1202 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1203
1204 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1205 if (!vlabuf)
1206 return ERR_PTR(-ENOMEM);
1207
1208 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1209 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1210 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1211
1212 os_desc_type->ct_owner = owner;
1213 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1214 configfs_add_default_group(os_desc_group, parent);
1215
1216 interface_type->ct_group_ops = &interf_grp_ops;
1217 interface_type->ct_attrs = interf_grp_attrs;
1218 interface_type->ct_owner = owner;
1219
1220 while (n_interf--) {
1221 struct usb_os_desc *d;
1222
1223 d = desc[n_interf];
1224 d->owner = owner;
1225 config_group_init_type_name(&d->group, "", interface_type);
1226 config_item_set_name(&d->group.cg_item, "interface.%s",
1227 names[n_interf]);
1228 configfs_add_default_group(&d->group, os_desc_group);
1229 }
1230
1231 return os_desc_group;
1232}
1233EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1234
1235static int configfs_do_nothing(struct usb_composite_dev *cdev)
1236{
1237 WARN_ON(1);
1238 return -EINVAL;
1239}
1240
1241int composite_dev_prepare(struct usb_composite_driver *composite,
1242 struct usb_composite_dev *dev);
1243
1244int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1245 struct usb_ep *ep0);
1246
1247static void purge_configs_funcs(struct gadget_info *gi)
1248{
1249 struct usb_configuration *c;
1250
1251 list_for_each_entry(c, &gi->cdev.configs, list) {
1252 struct usb_function *f, *tmp;
1253 struct config_usb_cfg *cfg;
1254
1255 cfg = container_of(c, struct config_usb_cfg, c);
1256
1257 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1258
1259 list_move(&f->list, &cfg->func_list);
1260 if (f->unbind) {
1261 dev_dbg(&gi->cdev.gadget->dev,
1262 "unbind function '%s'/%p\n",
1263 f->name, f);
1264 f->unbind(c, f);
1265 }
1266 }
1267 c->next_interface_id = 0;
1268 memset(c->interface, 0, sizeof(c->interface));
1269 c->superspeed_plus = 0;
1270 c->superspeed = 0;
1271 c->highspeed = 0;
1272 c->fullspeed = 0;
1273 }
1274}
1275
1276static int configfs_composite_bind(struct usb_gadget *gadget,
1277 struct usb_gadget_driver *gdriver)
1278{
1279 struct usb_composite_driver *composite = to_cdriver(gdriver);
1280 struct gadget_info *gi = container_of(composite,
1281 struct gadget_info, composite);
1282 struct usb_composite_dev *cdev = &gi->cdev;
1283 struct usb_configuration *c;
1284 struct usb_string *s;
1285 unsigned i;
1286 int ret;
1287
1288 /* the gi->lock is hold by the caller */
1289 gi->unbind = 0;
1290 cdev->gadget = gadget;
1291 set_gadget_data(gadget, cdev);
1292 ret = composite_dev_prepare(composite, cdev);
1293 if (ret)
1294 return ret;
1295 /* and now the gadget bind */
1296 ret = -EINVAL;
1297
1298 if (list_empty(&gi->cdev.configs)) {
1299 pr_err("Need at least one configuration in %s.\n",
1300 gi->composite.name);
1301 goto err_comp_cleanup;
1302 }
1303
1304
1305 list_for_each_entry(c, &gi->cdev.configs, list) {
1306 struct config_usb_cfg *cfg;
1307
1308 cfg = container_of(c, struct config_usb_cfg, c);
1309 if (list_empty(&cfg->func_list)) {
1310 pr_err("Config %s/%d of %s needs at least one function.\n",
1311 c->label, c->bConfigurationValue,
1312 gi->composite.name);
1313 goto err_comp_cleanup;
1314 }
1315 }
1316
1317 /* init all strings */
1318 if (!list_empty(&gi->string_list)) {
1319 struct gadget_strings *gs;
1320
1321 i = 0;
1322 list_for_each_entry(gs, &gi->string_list, list) {
1323
1324 gi->gstrings[i] = &gs->stringtab_dev;
1325 gs->stringtab_dev.strings = gs->strings;
1326 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1327 gs->manufacturer;
1328 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1329 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1330 i++;
1331 }
1332 gi->gstrings[i] = NULL;
1333 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1334 USB_GADGET_FIRST_AVAIL_IDX);
1335 if (IS_ERR(s)) {
1336 ret = PTR_ERR(s);
1337 goto err_comp_cleanup;
1338 }
1339
1340 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1341 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1342 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1343 }
1344
1345 if (gi->use_os_desc) {
1346 cdev->use_os_string = true;
1347 cdev->b_vendor_code = gi->b_vendor_code;
1348 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1349 }
1350
1351 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1352 struct usb_descriptor_header *usb_desc;
1353
1354 usb_desc = usb_otg_descriptor_alloc(gadget);
1355 if (!usb_desc) {
1356 ret = -ENOMEM;
1357 goto err_comp_cleanup;
1358 }
1359 usb_otg_descriptor_init(gadget, usb_desc);
1360 otg_desc[0] = usb_desc;
1361 otg_desc[1] = NULL;
1362 }
1363
1364 /* Go through all configs, attach all functions */
1365 list_for_each_entry(c, &gi->cdev.configs, list) {
1366 struct config_usb_cfg *cfg;
1367 struct usb_function *f;
1368 struct usb_function *tmp;
1369 struct gadget_config_name *cn;
1370
1371 if (gadget_is_otg(gadget))
1372 c->descriptors = otg_desc;
1373
1374 cfg = container_of(c, struct config_usb_cfg, c);
1375 if (!list_empty(&cfg->string_list)) {
1376 i = 0;
1377 list_for_each_entry(cn, &cfg->string_list, list) {
1378 cfg->gstrings[i] = &cn->stringtab_dev;
1379 cn->stringtab_dev.strings = &cn->strings;
1380 cn->strings.s = cn->configuration;
1381 i++;
1382 }
1383 cfg->gstrings[i] = NULL;
1384 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1385 if (IS_ERR(s)) {
1386 ret = PTR_ERR(s);
1387 goto err_comp_cleanup;
1388 }
1389 c->iConfiguration = s[0].id;
1390 }
1391
1392 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1393 list_del(&f->list);
1394 ret = usb_add_function(c, f);
1395 if (ret) {
1396 list_add(&f->list, &cfg->func_list);
1397 goto err_purge_funcs;
1398 }
1399 }
1400 ret = usb_gadget_check_config(cdev->gadget);
1401 if (ret)
1402 goto err_purge_funcs;
1403
1404 usb_ep_autoconfig_reset(cdev->gadget);
1405 }
1406 if (cdev->use_os_string) {
1407 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1408 if (ret)
1409 goto err_purge_funcs;
1410 }
1411
1412 usb_ep_autoconfig_reset(cdev->gadget);
1413 return 0;
1414
1415err_purge_funcs:
1416 purge_configs_funcs(gi);
1417err_comp_cleanup:
1418 composite_dev_cleanup(cdev);
1419 return ret;
1420}
1421
1422static void configfs_composite_unbind(struct usb_gadget *gadget)
1423{
1424 struct usb_composite_dev *cdev;
1425 struct gadget_info *gi;
1426 unsigned long flags;
1427
1428 /* the gi->lock is hold by the caller */
1429
1430 cdev = get_gadget_data(gadget);
1431 gi = container_of(cdev, struct gadget_info, cdev);
1432 spin_lock_irqsave(&gi->spinlock, flags);
1433 gi->unbind = 1;
1434 spin_unlock_irqrestore(&gi->spinlock, flags);
1435
1436 kfree(otg_desc[0]);
1437 otg_desc[0] = NULL;
1438 purge_configs_funcs(gi);
1439 composite_dev_cleanup(cdev);
1440 usb_ep_autoconfig_reset(cdev->gadget);
1441 spin_lock_irqsave(&gi->spinlock, flags);
1442 cdev->gadget = NULL;
1443 cdev->deactivations = 0;
1444 gadget->deactivated = false;
1445 set_gadget_data(gadget, NULL);
1446 spin_unlock_irqrestore(&gi->spinlock, flags);
1447}
1448
1449static int configfs_composite_setup(struct usb_gadget *gadget,
1450 const struct usb_ctrlrequest *ctrl)
1451{
1452 struct usb_composite_dev *cdev;
1453 struct gadget_info *gi;
1454 unsigned long flags;
1455 int ret;
1456
1457 cdev = get_gadget_data(gadget);
1458 if (!cdev)
1459 return 0;
1460
1461 gi = container_of(cdev, struct gadget_info, cdev);
1462 spin_lock_irqsave(&gi->spinlock, flags);
1463 cdev = get_gadget_data(gadget);
1464 if (!cdev || gi->unbind) {
1465 spin_unlock_irqrestore(&gi->spinlock, flags);
1466 return 0;
1467 }
1468
1469 ret = composite_setup(gadget, ctrl);
1470 spin_unlock_irqrestore(&gi->spinlock, flags);
1471 return ret;
1472}
1473
1474static void configfs_composite_disconnect(struct usb_gadget *gadget)
1475{
1476 struct usb_composite_dev *cdev;
1477 struct gadget_info *gi;
1478 unsigned long flags;
1479
1480 cdev = get_gadget_data(gadget);
1481 if (!cdev)
1482 return;
1483
1484 gi = container_of(cdev, struct gadget_info, cdev);
1485 spin_lock_irqsave(&gi->spinlock, flags);
1486 cdev = get_gadget_data(gadget);
1487 if (!cdev || gi->unbind) {
1488 spin_unlock_irqrestore(&gi->spinlock, flags);
1489 return;
1490 }
1491
1492 composite_disconnect(gadget);
1493 spin_unlock_irqrestore(&gi->spinlock, flags);
1494}
1495
1496static void configfs_composite_reset(struct usb_gadget *gadget)
1497{
1498 struct usb_composite_dev *cdev;
1499 struct gadget_info *gi;
1500 unsigned long flags;
1501
1502 cdev = get_gadget_data(gadget);
1503 if (!cdev)
1504 return;
1505
1506 gi = container_of(cdev, struct gadget_info, cdev);
1507 spin_lock_irqsave(&gi->spinlock, flags);
1508 cdev = get_gadget_data(gadget);
1509 if (!cdev || gi->unbind) {
1510 spin_unlock_irqrestore(&gi->spinlock, flags);
1511 return;
1512 }
1513
1514 composite_reset(gadget);
1515 spin_unlock_irqrestore(&gi->spinlock, flags);
1516}
1517
1518static void configfs_composite_suspend(struct usb_gadget *gadget)
1519{
1520 struct usb_composite_dev *cdev;
1521 struct gadget_info *gi;
1522 unsigned long flags;
1523
1524 cdev = get_gadget_data(gadget);
1525 if (!cdev)
1526 return;
1527
1528 gi = container_of(cdev, struct gadget_info, cdev);
1529 spin_lock_irqsave(&gi->spinlock, flags);
1530 cdev = get_gadget_data(gadget);
1531 if (!cdev || gi->unbind) {
1532 spin_unlock_irqrestore(&gi->spinlock, flags);
1533 return;
1534 }
1535
1536 composite_suspend(gadget);
1537 spin_unlock_irqrestore(&gi->spinlock, flags);
1538}
1539
1540static void configfs_composite_resume(struct usb_gadget *gadget)
1541{
1542 struct usb_composite_dev *cdev;
1543 struct gadget_info *gi;
1544 unsigned long flags;
1545
1546 cdev = get_gadget_data(gadget);
1547 if (!cdev)
1548 return;
1549
1550 gi = container_of(cdev, struct gadget_info, cdev);
1551 spin_lock_irqsave(&gi->spinlock, flags);
1552 cdev = get_gadget_data(gadget);
1553 if (!cdev || gi->unbind) {
1554 spin_unlock_irqrestore(&gi->spinlock, flags);
1555 return;
1556 }
1557
1558 composite_resume(gadget);
1559 spin_unlock_irqrestore(&gi->spinlock, flags);
1560}
1561
1562static const struct usb_gadget_driver configfs_driver_template = {
1563 .bind = configfs_composite_bind,
1564 .unbind = configfs_composite_unbind,
1565
1566 .setup = configfs_composite_setup,
1567 .reset = configfs_composite_reset,
1568 .disconnect = configfs_composite_disconnect,
1569
1570 .suspend = configfs_composite_suspend,
1571 .resume = configfs_composite_resume,
1572
1573 .max_speed = USB_SPEED_SUPER_PLUS,
1574 .driver = {
1575 .owner = THIS_MODULE,
1576 },
1577 .match_existing_only = 1,
1578};
1579
1580static struct config_group *gadgets_make(
1581 struct config_group *group,
1582 const char *name)
1583{
1584 struct gadget_info *gi;
1585
1586 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1587 if (!gi)
1588 return ERR_PTR(-ENOMEM);
1589
1590 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1591
1592 config_group_init_type_name(&gi->functions_group, "functions",
1593 &functions_type);
1594 configfs_add_default_group(&gi->functions_group, &gi->group);
1595
1596 config_group_init_type_name(&gi->configs_group, "configs",
1597 &config_desc_type);
1598 configfs_add_default_group(&gi->configs_group, &gi->group);
1599
1600 config_group_init_type_name(&gi->strings_group, "strings",
1601 &gadget_strings_strings_type);
1602 configfs_add_default_group(&gi->strings_group, &gi->group);
1603
1604 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1605 &os_desc_type);
1606 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1607
1608 gi->composite.bind = configfs_do_nothing;
1609 gi->composite.unbind = configfs_do_nothing;
1610 gi->composite.suspend = NULL;
1611 gi->composite.resume = NULL;
1612 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
1613
1614 spin_lock_init(&gi->spinlock);
1615 mutex_init(&gi->lock);
1616 INIT_LIST_HEAD(&gi->string_list);
1617 INIT_LIST_HEAD(&gi->available_func);
1618
1619 composite_init_dev(&gi->cdev);
1620 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1621 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1622 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1623
1624 gi->composite.gadget_driver = configfs_driver_template;
1625
1626 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL,
1627 "configfs-gadget.%s", name);
1628 if (!gi->composite.gadget_driver.driver.name)
1629 goto err;
1630
1631 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1632 gi->composite.name = gi->composite.gadget_driver.function;
1633
1634 if (!gi->composite.gadget_driver.function)
1635 goto out_free_driver_name;
1636
1637 return &gi->group;
1638
1639out_free_driver_name:
1640 kfree(gi->composite.gadget_driver.driver.name);
1641err:
1642 kfree(gi);
1643 return ERR_PTR(-ENOMEM);
1644}
1645
1646static void gadgets_drop(struct config_group *group, struct config_item *item)
1647{
1648 config_item_put(item);
1649}
1650
1651static struct configfs_group_operations gadgets_ops = {
1652 .make_group = &gadgets_make,
1653 .drop_item = &gadgets_drop,
1654};
1655
1656static const struct config_item_type gadgets_type = {
1657 .ct_group_ops = &gadgets_ops,
1658 .ct_owner = THIS_MODULE,
1659};
1660
1661static struct configfs_subsystem gadget_subsys = {
1662 .su_group = {
1663 .cg_item = {
1664 .ci_namebuf = "usb_gadget",
1665 .ci_type = &gadgets_type,
1666 },
1667 },
1668 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1669};
1670
1671void unregister_gadget_item(struct config_item *item)
1672{
1673 struct gadget_info *gi = to_gadget_info(item);
1674
1675 mutex_lock(&gi->lock);
1676 unregister_gadget(gi);
1677 mutex_unlock(&gi->lock);
1678}
1679EXPORT_SYMBOL_GPL(unregister_gadget_item);
1680
1681static int __init gadget_cfs_init(void)
1682{
1683 int ret;
1684
1685 config_group_init(&gadget_subsys.su_group);
1686
1687 ret = configfs_register_subsystem(&gadget_subsys);
1688 return ret;
1689}
1690module_init(gadget_cfs_init);
1691
1692static void __exit gadget_cfs_exit(void)
1693{
1694 configfs_unregister_subsystem(&gadget_subsys);
1695}
1696module_exit(gadget_cfs_exit);
1#include <linux/configfs.h>
2#include <linux/module.h>
3#include <linux/slab.h>
4#include <linux/device.h>
5#include <linux/nls.h>
6#include <linux/usb/composite.h>
7#include <linux/usb/gadget_configfs.h>
8#include "configfs.h"
9#include "u_f.h"
10#include "u_os_desc.h"
11
12int check_user_usb_string(const char *name,
13 struct usb_gadget_strings *stringtab_dev)
14{
15 unsigned primary_lang;
16 unsigned sub_lang;
17 u16 num;
18 int ret;
19
20 ret = kstrtou16(name, 0, &num);
21 if (ret)
22 return ret;
23
24 primary_lang = num & 0x3ff;
25 sub_lang = num >> 10;
26
27 /* simple sanity check for valid langid */
28 switch (primary_lang) {
29 case 0:
30 case 0x62 ... 0xfe:
31 case 0x100 ... 0x3ff:
32 return -EINVAL;
33 }
34 if (!sub_lang)
35 return -EINVAL;
36
37 stringtab_dev->language = num;
38 return 0;
39}
40
41#define MAX_NAME_LEN 40
42#define MAX_USB_STRING_LANGS 2
43
44static const struct usb_descriptor_header *otg_desc[2];
45
46struct gadget_info {
47 struct config_group group;
48 struct config_group functions_group;
49 struct config_group configs_group;
50 struct config_group strings_group;
51 struct config_group os_desc_group;
52
53 struct mutex lock;
54 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
55 struct list_head string_list;
56 struct list_head available_func;
57
58 struct usb_composite_driver composite;
59 struct usb_composite_dev cdev;
60 bool use_os_desc;
61 char b_vendor_code;
62 char qw_sign[OS_STRING_QW_SIGN_LEN];
63};
64
65static inline struct gadget_info *to_gadget_info(struct config_item *item)
66{
67 return container_of(to_config_group(item), struct gadget_info, group);
68}
69
70struct config_usb_cfg {
71 struct config_group group;
72 struct config_group strings_group;
73 struct list_head string_list;
74 struct usb_configuration c;
75 struct list_head func_list;
76 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
77};
78
79static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
80{
81 return container_of(to_config_group(item), struct config_usb_cfg,
82 group);
83}
84
85struct gadget_strings {
86 struct usb_gadget_strings stringtab_dev;
87 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
88 char *manufacturer;
89 char *product;
90 char *serialnumber;
91
92 struct config_group group;
93 struct list_head list;
94};
95
96struct os_desc {
97 struct config_group group;
98};
99
100struct gadget_config_name {
101 struct usb_gadget_strings stringtab_dev;
102 struct usb_string strings;
103 char *configuration;
104
105 struct config_group group;
106 struct list_head list;
107};
108
109static int usb_string_copy(const char *s, char **s_copy)
110{
111 int ret;
112 char *str;
113 char *copy = *s_copy;
114 ret = strlen(s);
115 if (ret > 126)
116 return -EOVERFLOW;
117
118 str = kstrdup(s, GFP_KERNEL);
119 if (!str)
120 return -ENOMEM;
121 if (str[ret - 1] == '\n')
122 str[ret - 1] = '\0';
123 kfree(copy);
124 *s_copy = str;
125 return 0;
126}
127
128#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
129static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
130 char *page) \
131{ \
132 return sprintf(page, "0x%02x\n", \
133 to_gadget_info(item)->cdev.desc.__name); \
134}
135
136#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
137static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
138 char *page) \
139{ \
140 return sprintf(page, "0x%04x\n", \
141 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
142}
143
144
145#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
146static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
147 const char *page, size_t len) \
148{ \
149 u8 val; \
150 int ret; \
151 ret = kstrtou8(page, 0, &val); \
152 if (ret) \
153 return ret; \
154 to_gadget_info(item)->cdev.desc._name = val; \
155 return len; \
156}
157
158#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
159static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
160 const char *page, size_t len) \
161{ \
162 u16 val; \
163 int ret; \
164 ret = kstrtou16(page, 0, &val); \
165 if (ret) \
166 return ret; \
167 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
168 return len; \
169}
170
171#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
172 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
173 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
174
175GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
176GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
177GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
178GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
179GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
180GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
181GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
182GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
183
184static ssize_t is_valid_bcd(u16 bcd_val)
185{
186 if ((bcd_val & 0xf) > 9)
187 return -EINVAL;
188 if (((bcd_val >> 4) & 0xf) > 9)
189 return -EINVAL;
190 if (((bcd_val >> 8) & 0xf) > 9)
191 return -EINVAL;
192 if (((bcd_val >> 12) & 0xf) > 9)
193 return -EINVAL;
194 return 0;
195}
196
197static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
198 const char *page, size_t len)
199{
200 u16 bcdDevice;
201 int ret;
202
203 ret = kstrtou16(page, 0, &bcdDevice);
204 if (ret)
205 return ret;
206 ret = is_valid_bcd(bcdDevice);
207 if (ret)
208 return ret;
209
210 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
211 return len;
212}
213
214static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
215 const char *page, size_t len)
216{
217 u16 bcdUSB;
218 int ret;
219
220 ret = kstrtou16(page, 0, &bcdUSB);
221 if (ret)
222 return ret;
223 ret = is_valid_bcd(bcdUSB);
224 if (ret)
225 return ret;
226
227 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
228 return len;
229}
230
231static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
232{
233 char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name;
234
235 return sprintf(page, "%s\n", udc_name ?: "");
236}
237
238static int unregister_gadget(struct gadget_info *gi)
239{
240 int ret;
241
242 if (!gi->composite.gadget_driver.udc_name)
243 return -ENODEV;
244
245 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
246 if (ret)
247 return ret;
248 kfree(gi->composite.gadget_driver.udc_name);
249 gi->composite.gadget_driver.udc_name = NULL;
250 return 0;
251}
252
253static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
254 const char *page, size_t len)
255{
256 struct gadget_info *gi = to_gadget_info(item);
257 char *name;
258 int ret;
259
260 name = kstrdup(page, GFP_KERNEL);
261 if (!name)
262 return -ENOMEM;
263 if (name[len - 1] == '\n')
264 name[len - 1] = '\0';
265
266 mutex_lock(&gi->lock);
267
268 if (!strlen(name)) {
269 ret = unregister_gadget(gi);
270 if (ret)
271 goto err;
272 } else {
273 if (gi->composite.gadget_driver.udc_name) {
274 ret = -EBUSY;
275 goto err;
276 }
277 gi->composite.gadget_driver.udc_name = name;
278 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
279 if (ret) {
280 gi->composite.gadget_driver.udc_name = NULL;
281 goto err;
282 }
283 }
284 mutex_unlock(&gi->lock);
285 return len;
286err:
287 kfree(name);
288 mutex_unlock(&gi->lock);
289 return ret;
290}
291
292CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
293CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
294CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
295CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
296CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
297CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
298CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
299CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
300CONFIGFS_ATTR(gadget_dev_desc_, UDC);
301
302static struct configfs_attribute *gadget_root_attrs[] = {
303 &gadget_dev_desc_attr_bDeviceClass,
304 &gadget_dev_desc_attr_bDeviceSubClass,
305 &gadget_dev_desc_attr_bDeviceProtocol,
306 &gadget_dev_desc_attr_bMaxPacketSize0,
307 &gadget_dev_desc_attr_idVendor,
308 &gadget_dev_desc_attr_idProduct,
309 &gadget_dev_desc_attr_bcdDevice,
310 &gadget_dev_desc_attr_bcdUSB,
311 &gadget_dev_desc_attr_UDC,
312 NULL,
313};
314
315static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
316{
317 return container_of(to_config_group(item), struct gadget_strings,
318 group);
319}
320
321static inline struct gadget_config_name *to_gadget_config_name(
322 struct config_item *item)
323{
324 return container_of(to_config_group(item), struct gadget_config_name,
325 group);
326}
327
328static inline struct usb_function_instance *to_usb_function_instance(
329 struct config_item *item)
330{
331 return container_of(to_config_group(item),
332 struct usb_function_instance, group);
333}
334
335static void gadget_info_attr_release(struct config_item *item)
336{
337 struct gadget_info *gi = to_gadget_info(item);
338
339 WARN_ON(!list_empty(&gi->cdev.configs));
340 WARN_ON(!list_empty(&gi->string_list));
341 WARN_ON(!list_empty(&gi->available_func));
342 kfree(gi->composite.gadget_driver.function);
343 kfree(gi);
344}
345
346static struct configfs_item_operations gadget_root_item_ops = {
347 .release = gadget_info_attr_release,
348};
349
350static void gadget_config_attr_release(struct config_item *item)
351{
352 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
353
354 WARN_ON(!list_empty(&cfg->c.functions));
355 list_del(&cfg->c.list);
356 kfree(cfg->c.label);
357 kfree(cfg);
358}
359
360static int config_usb_cfg_link(
361 struct config_item *usb_cfg_ci,
362 struct config_item *usb_func_ci)
363{
364 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
365 struct usb_composite_dev *cdev = cfg->c.cdev;
366 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
367
368 struct config_group *group = to_config_group(usb_func_ci);
369 struct usb_function_instance *fi = container_of(group,
370 struct usb_function_instance, group);
371 struct usb_function_instance *a_fi;
372 struct usb_function *f;
373 int ret;
374
375 mutex_lock(&gi->lock);
376 /*
377 * Make sure this function is from within our _this_ gadget and not
378 * from another gadget or a random directory.
379 * Also a function instance can only be linked once.
380 */
381 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
382 if (a_fi == fi)
383 break;
384 }
385 if (a_fi != fi) {
386 ret = -EINVAL;
387 goto out;
388 }
389
390 list_for_each_entry(f, &cfg->func_list, list) {
391 if (f->fi == fi) {
392 ret = -EEXIST;
393 goto out;
394 }
395 }
396
397 f = usb_get_function(fi);
398 if (IS_ERR(f)) {
399 ret = PTR_ERR(f);
400 goto out;
401 }
402
403 /* stash the function until we bind it to the gadget */
404 list_add_tail(&f->list, &cfg->func_list);
405 ret = 0;
406out:
407 mutex_unlock(&gi->lock);
408 return ret;
409}
410
411static void config_usb_cfg_unlink(
412 struct config_item *usb_cfg_ci,
413 struct config_item *usb_func_ci)
414{
415 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
416 struct usb_composite_dev *cdev = cfg->c.cdev;
417 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
418
419 struct config_group *group = to_config_group(usb_func_ci);
420 struct usb_function_instance *fi = container_of(group,
421 struct usb_function_instance, group);
422 struct usb_function *f;
423
424 /*
425 * ideally I would like to forbid to unlink functions while a gadget is
426 * bound to an UDC. Since this isn't possible at the moment, we simply
427 * force an unbind, the function is available here and then we can
428 * remove the function.
429 */
430 mutex_lock(&gi->lock);
431 if (gi->composite.gadget_driver.udc_name)
432 unregister_gadget(gi);
433 WARN_ON(gi->composite.gadget_driver.udc_name);
434
435 list_for_each_entry(f, &cfg->func_list, list) {
436 if (f->fi == fi) {
437 list_del(&f->list);
438 usb_put_function(f);
439 mutex_unlock(&gi->lock);
440 return;
441 }
442 }
443 mutex_unlock(&gi->lock);
444 WARN(1, "Unable to locate function to unbind\n");
445}
446
447static struct configfs_item_operations gadget_config_item_ops = {
448 .release = gadget_config_attr_release,
449 .allow_link = config_usb_cfg_link,
450 .drop_link = config_usb_cfg_unlink,
451};
452
453
454static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
455 char *page)
456{
457 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
458}
459
460static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
461 const char *page, size_t len)
462{
463 u16 val;
464 int ret;
465 ret = kstrtou16(page, 0, &val);
466 if (ret)
467 return ret;
468 if (DIV_ROUND_UP(val, 8) > 0xff)
469 return -ERANGE;
470 to_config_usb_cfg(item)->c.MaxPower = val;
471 return len;
472}
473
474static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
475 char *page)
476{
477 return sprintf(page, "0x%02x\n",
478 to_config_usb_cfg(item)->c.bmAttributes);
479}
480
481static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
482 const char *page, size_t len)
483{
484 u8 val;
485 int ret;
486 ret = kstrtou8(page, 0, &val);
487 if (ret)
488 return ret;
489 if (!(val & USB_CONFIG_ATT_ONE))
490 return -EINVAL;
491 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
492 USB_CONFIG_ATT_WAKEUP))
493 return -EINVAL;
494 to_config_usb_cfg(item)->c.bmAttributes = val;
495 return len;
496}
497
498CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
499CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
500
501static struct configfs_attribute *gadget_config_attrs[] = {
502 &gadget_config_desc_attr_MaxPower,
503 &gadget_config_desc_attr_bmAttributes,
504 NULL,
505};
506
507static struct config_item_type gadget_config_type = {
508 .ct_item_ops = &gadget_config_item_ops,
509 .ct_attrs = gadget_config_attrs,
510 .ct_owner = THIS_MODULE,
511};
512
513static struct config_item_type gadget_root_type = {
514 .ct_item_ops = &gadget_root_item_ops,
515 .ct_attrs = gadget_root_attrs,
516 .ct_owner = THIS_MODULE,
517};
518
519static void composite_init_dev(struct usb_composite_dev *cdev)
520{
521 spin_lock_init(&cdev->lock);
522 INIT_LIST_HEAD(&cdev->configs);
523 INIT_LIST_HEAD(&cdev->gstrings);
524}
525
526static struct config_group *function_make(
527 struct config_group *group,
528 const char *name)
529{
530 struct gadget_info *gi;
531 struct usb_function_instance *fi;
532 char buf[MAX_NAME_LEN];
533 char *func_name;
534 char *instance_name;
535 int ret;
536
537 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
538 if (ret >= MAX_NAME_LEN)
539 return ERR_PTR(-ENAMETOOLONG);
540
541 func_name = buf;
542 instance_name = strchr(func_name, '.');
543 if (!instance_name) {
544 pr_err("Unable to locate . in FUNC.INSTANCE\n");
545 return ERR_PTR(-EINVAL);
546 }
547 *instance_name = '\0';
548 instance_name++;
549
550 fi = usb_get_function_instance(func_name);
551 if (IS_ERR(fi))
552 return ERR_CAST(fi);
553
554 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
555 if (ret) {
556 usb_put_function_instance(fi);
557 return ERR_PTR(ret);
558 }
559 if (fi->set_inst_name) {
560 ret = fi->set_inst_name(fi, instance_name);
561 if (ret) {
562 usb_put_function_instance(fi);
563 return ERR_PTR(ret);
564 }
565 }
566
567 gi = container_of(group, struct gadget_info, functions_group);
568
569 mutex_lock(&gi->lock);
570 list_add_tail(&fi->cfs_list, &gi->available_func);
571 mutex_unlock(&gi->lock);
572 return &fi->group;
573}
574
575static void function_drop(
576 struct config_group *group,
577 struct config_item *item)
578{
579 struct usb_function_instance *fi = to_usb_function_instance(item);
580 struct gadget_info *gi;
581
582 gi = container_of(group, struct gadget_info, functions_group);
583
584 mutex_lock(&gi->lock);
585 list_del(&fi->cfs_list);
586 mutex_unlock(&gi->lock);
587 config_item_put(item);
588}
589
590static struct configfs_group_operations functions_ops = {
591 .make_group = &function_make,
592 .drop_item = &function_drop,
593};
594
595static struct config_item_type functions_type = {
596 .ct_group_ops = &functions_ops,
597 .ct_owner = THIS_MODULE,
598};
599
600GS_STRINGS_RW(gadget_config_name, configuration);
601
602static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
603 &gadget_config_name_attr_configuration,
604 NULL,
605};
606
607static void gadget_config_name_attr_release(struct config_item *item)
608{
609 struct gadget_config_name *cn = to_gadget_config_name(item);
610
611 kfree(cn->configuration);
612
613 list_del(&cn->list);
614 kfree(cn);
615}
616
617USB_CONFIG_STRING_RW_OPS(gadget_config_name);
618USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
619
620static struct config_group *config_desc_make(
621 struct config_group *group,
622 const char *name)
623{
624 struct gadget_info *gi;
625 struct config_usb_cfg *cfg;
626 char buf[MAX_NAME_LEN];
627 char *num_str;
628 u8 num;
629 int ret;
630
631 gi = container_of(group, struct gadget_info, configs_group);
632 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
633 if (ret >= MAX_NAME_LEN)
634 return ERR_PTR(-ENAMETOOLONG);
635
636 num_str = strchr(buf, '.');
637 if (!num_str) {
638 pr_err("Unable to locate . in name.bConfigurationValue\n");
639 return ERR_PTR(-EINVAL);
640 }
641
642 *num_str = '\0';
643 num_str++;
644
645 if (!strlen(buf))
646 return ERR_PTR(-EINVAL);
647
648 ret = kstrtou8(num_str, 0, &num);
649 if (ret)
650 return ERR_PTR(ret);
651
652 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
653 if (!cfg)
654 return ERR_PTR(-ENOMEM);
655 cfg->c.label = kstrdup(buf, GFP_KERNEL);
656 if (!cfg->c.label) {
657 ret = -ENOMEM;
658 goto err;
659 }
660 cfg->c.bConfigurationValue = num;
661 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
662 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
663 INIT_LIST_HEAD(&cfg->string_list);
664 INIT_LIST_HEAD(&cfg->func_list);
665
666 config_group_init_type_name(&cfg->group, name,
667 &gadget_config_type);
668
669 config_group_init_type_name(&cfg->strings_group, "strings",
670 &gadget_config_name_strings_type);
671 configfs_add_default_group(&cfg->strings_group, &cfg->group);
672
673 ret = usb_add_config_only(&gi->cdev, &cfg->c);
674 if (ret)
675 goto err;
676
677 return &cfg->group;
678err:
679 kfree(cfg->c.label);
680 kfree(cfg);
681 return ERR_PTR(ret);
682}
683
684static void config_desc_drop(
685 struct config_group *group,
686 struct config_item *item)
687{
688 config_item_put(item);
689}
690
691static struct configfs_group_operations config_desc_ops = {
692 .make_group = &config_desc_make,
693 .drop_item = &config_desc_drop,
694};
695
696static struct config_item_type config_desc_type = {
697 .ct_group_ops = &config_desc_ops,
698 .ct_owner = THIS_MODULE,
699};
700
701GS_STRINGS_RW(gadget_strings, manufacturer);
702GS_STRINGS_RW(gadget_strings, product);
703GS_STRINGS_RW(gadget_strings, serialnumber);
704
705static struct configfs_attribute *gadget_strings_langid_attrs[] = {
706 &gadget_strings_attr_manufacturer,
707 &gadget_strings_attr_product,
708 &gadget_strings_attr_serialnumber,
709 NULL,
710};
711
712static void gadget_strings_attr_release(struct config_item *item)
713{
714 struct gadget_strings *gs = to_gadget_strings(item);
715
716 kfree(gs->manufacturer);
717 kfree(gs->product);
718 kfree(gs->serialnumber);
719
720 list_del(&gs->list);
721 kfree(gs);
722}
723
724USB_CONFIG_STRING_RW_OPS(gadget_strings);
725USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
726
727static inline struct os_desc *to_os_desc(struct config_item *item)
728{
729 return container_of(to_config_group(item), struct os_desc, group);
730}
731
732static inline struct gadget_info *os_desc_item_to_gadget_info(
733 struct config_item *item)
734{
735 return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
736}
737
738static ssize_t os_desc_use_show(struct config_item *item, char *page)
739{
740 return sprintf(page, "%d",
741 os_desc_item_to_gadget_info(item)->use_os_desc);
742}
743
744static ssize_t os_desc_use_store(struct config_item *item, const char *page,
745 size_t len)
746{
747 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
748 int ret;
749 bool use;
750
751 mutex_lock(&gi->lock);
752 ret = strtobool(page, &use);
753 if (!ret) {
754 gi->use_os_desc = use;
755 ret = len;
756 }
757 mutex_unlock(&gi->lock);
758
759 return ret;
760}
761
762static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
763{
764 return sprintf(page, "%d",
765 os_desc_item_to_gadget_info(item)->b_vendor_code);
766}
767
768static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
769 const char *page, size_t len)
770{
771 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
772 int ret;
773 u8 b_vendor_code;
774
775 mutex_lock(&gi->lock);
776 ret = kstrtou8(page, 0, &b_vendor_code);
777 if (!ret) {
778 gi->b_vendor_code = b_vendor_code;
779 ret = len;
780 }
781 mutex_unlock(&gi->lock);
782
783 return ret;
784}
785
786static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
787{
788 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
789
790 memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
791 return OS_STRING_QW_SIGN_LEN;
792}
793
794static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
795 size_t len)
796{
797 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
798 int res, l;
799
800 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
801 if (page[l - 1] == '\n')
802 --l;
803
804 mutex_lock(&gi->lock);
805 res = utf8s_to_utf16s(page, l,
806 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
807 OS_STRING_QW_SIGN_LEN);
808 if (res > 0)
809 res = len;
810 mutex_unlock(&gi->lock);
811
812 return res;
813}
814
815CONFIGFS_ATTR(os_desc_, use);
816CONFIGFS_ATTR(os_desc_, b_vendor_code);
817CONFIGFS_ATTR(os_desc_, qw_sign);
818
819static struct configfs_attribute *os_desc_attrs[] = {
820 &os_desc_attr_use,
821 &os_desc_attr_b_vendor_code,
822 &os_desc_attr_qw_sign,
823 NULL,
824};
825
826static void os_desc_attr_release(struct config_item *item)
827{
828 struct os_desc *os_desc = to_os_desc(item);
829 kfree(os_desc);
830}
831
832static int os_desc_link(struct config_item *os_desc_ci,
833 struct config_item *usb_cfg_ci)
834{
835 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
836 struct gadget_info, os_desc_group);
837 struct usb_composite_dev *cdev = &gi->cdev;
838 struct config_usb_cfg *c_target =
839 container_of(to_config_group(usb_cfg_ci),
840 struct config_usb_cfg, group);
841 struct usb_configuration *c;
842 int ret;
843
844 mutex_lock(&gi->lock);
845 list_for_each_entry(c, &cdev->configs, list) {
846 if (c == &c_target->c)
847 break;
848 }
849 if (c != &c_target->c) {
850 ret = -EINVAL;
851 goto out;
852 }
853
854 if (cdev->os_desc_config) {
855 ret = -EBUSY;
856 goto out;
857 }
858
859 cdev->os_desc_config = &c_target->c;
860 ret = 0;
861
862out:
863 mutex_unlock(&gi->lock);
864 return ret;
865}
866
867static void os_desc_unlink(struct config_item *os_desc_ci,
868 struct config_item *usb_cfg_ci)
869{
870 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
871 struct gadget_info, os_desc_group);
872 struct usb_composite_dev *cdev = &gi->cdev;
873
874 mutex_lock(&gi->lock);
875 if (gi->composite.gadget_driver.udc_name)
876 unregister_gadget(gi);
877 cdev->os_desc_config = NULL;
878 WARN_ON(gi->composite.gadget_driver.udc_name);
879 mutex_unlock(&gi->lock);
880}
881
882static struct configfs_item_operations os_desc_ops = {
883 .release = os_desc_attr_release,
884 .allow_link = os_desc_link,
885 .drop_link = os_desc_unlink,
886};
887
888static struct config_item_type os_desc_type = {
889 .ct_item_ops = &os_desc_ops,
890 .ct_attrs = os_desc_attrs,
891 .ct_owner = THIS_MODULE,
892};
893
894static inline struct usb_os_desc_ext_prop
895*to_usb_os_desc_ext_prop(struct config_item *item)
896{
897 return container_of(item, struct usb_os_desc_ext_prop, item);
898}
899
900static ssize_t ext_prop_type_show(struct config_item *item, char *page)
901{
902 return sprintf(page, "%d", to_usb_os_desc_ext_prop(item)->type);
903}
904
905static ssize_t ext_prop_type_store(struct config_item *item,
906 const char *page, size_t len)
907{
908 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
909 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
910 u8 type;
911 int ret;
912
913 if (desc->opts_mutex)
914 mutex_lock(desc->opts_mutex);
915 ret = kstrtou8(page, 0, &type);
916 if (ret)
917 goto end;
918 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
919 ret = -EINVAL;
920 goto end;
921 }
922
923 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
924 ext_prop->type == USB_EXT_PROP_LE32 ||
925 ext_prop->type == USB_EXT_PROP_BE32) &&
926 (type == USB_EXT_PROP_UNICODE ||
927 type == USB_EXT_PROP_UNICODE_ENV ||
928 type == USB_EXT_PROP_UNICODE_LINK))
929 ext_prop->data_len <<= 1;
930 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
931 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
932 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
933 (type == USB_EXT_PROP_BINARY ||
934 type == USB_EXT_PROP_LE32 ||
935 type == USB_EXT_PROP_BE32))
936 ext_prop->data_len >>= 1;
937 ext_prop->type = type;
938 ret = len;
939
940end:
941 if (desc->opts_mutex)
942 mutex_unlock(desc->opts_mutex);
943 return ret;
944}
945
946static ssize_t ext_prop_data_show(struct config_item *item, char *page)
947{
948 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
949 int len = ext_prop->data_len;
950
951 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
952 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
953 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
954 len >>= 1;
955 memcpy(page, ext_prop->data, len);
956
957 return len;
958}
959
960static ssize_t ext_prop_data_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 char *new_data;
966 size_t ret_len = len;
967
968 if (page[len - 1] == '\n' || page[len - 1] == '\0')
969 --len;
970 new_data = kmemdup(page, len, GFP_KERNEL);
971 if (!new_data)
972 return -ENOMEM;
973
974 if (desc->opts_mutex)
975 mutex_lock(desc->opts_mutex);
976 kfree(ext_prop->data);
977 ext_prop->data = new_data;
978 desc->ext_prop_len -= ext_prop->data_len;
979 ext_prop->data_len = len;
980 desc->ext_prop_len += ext_prop->data_len;
981 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
982 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
983 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
984 desc->ext_prop_len -= ext_prop->data_len;
985 ext_prop->data_len <<= 1;
986 ext_prop->data_len += 2;
987 desc->ext_prop_len += ext_prop->data_len;
988 }
989 if (desc->opts_mutex)
990 mutex_unlock(desc->opts_mutex);
991 return ret_len;
992}
993
994CONFIGFS_ATTR(ext_prop_, type);
995CONFIGFS_ATTR(ext_prop_, data);
996
997static struct configfs_attribute *ext_prop_attrs[] = {
998 &ext_prop_attr_type,
999 &ext_prop_attr_data,
1000 NULL,
1001};
1002
1003static void usb_os_desc_ext_prop_release(struct config_item *item)
1004{
1005 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1006
1007 kfree(ext_prop); /* frees a whole chunk */
1008}
1009
1010static struct configfs_item_operations ext_prop_ops = {
1011 .release = usb_os_desc_ext_prop_release,
1012};
1013
1014static struct config_item *ext_prop_make(
1015 struct config_group *group,
1016 const char *name)
1017{
1018 struct usb_os_desc_ext_prop *ext_prop;
1019 struct config_item_type *ext_prop_type;
1020 struct usb_os_desc *desc;
1021 char *vlabuf;
1022
1023 vla_group(data_chunk);
1024 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1025 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1026
1027 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1028 if (!vlabuf)
1029 return ERR_PTR(-ENOMEM);
1030
1031 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1032 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1033
1034 desc = container_of(group, struct usb_os_desc, group);
1035 ext_prop_type->ct_item_ops = &ext_prop_ops;
1036 ext_prop_type->ct_attrs = ext_prop_attrs;
1037 ext_prop_type->ct_owner = desc->owner;
1038
1039 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1040
1041 ext_prop->name = kstrdup(name, GFP_KERNEL);
1042 if (!ext_prop->name) {
1043 kfree(vlabuf);
1044 return ERR_PTR(-ENOMEM);
1045 }
1046 desc->ext_prop_len += 14;
1047 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1048 if (desc->opts_mutex)
1049 mutex_lock(desc->opts_mutex);
1050 desc->ext_prop_len += ext_prop->name_len;
1051 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1052 ++desc->ext_prop_count;
1053 if (desc->opts_mutex)
1054 mutex_unlock(desc->opts_mutex);
1055
1056 return &ext_prop->item;
1057}
1058
1059static void ext_prop_drop(struct config_group *group, struct config_item *item)
1060{
1061 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1062 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1063
1064 if (desc->opts_mutex)
1065 mutex_lock(desc->opts_mutex);
1066 list_del(&ext_prop->entry);
1067 --desc->ext_prop_count;
1068 kfree(ext_prop->name);
1069 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1070 if (desc->opts_mutex)
1071 mutex_unlock(desc->opts_mutex);
1072 config_item_put(item);
1073}
1074
1075static struct configfs_group_operations interf_grp_ops = {
1076 .make_item = &ext_prop_make,
1077 .drop_item = &ext_prop_drop,
1078};
1079
1080static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1081 char *page)
1082{
1083 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1084 return 8;
1085}
1086
1087static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1088 const char *page, size_t len)
1089{
1090 struct usb_os_desc *desc = to_usb_os_desc(item);
1091 int l;
1092
1093 l = min_t(int, 8, len);
1094 if (page[l - 1] == '\n')
1095 --l;
1096 if (desc->opts_mutex)
1097 mutex_lock(desc->opts_mutex);
1098 memcpy(desc->ext_compat_id, page, l);
1099
1100 if (desc->opts_mutex)
1101 mutex_unlock(desc->opts_mutex);
1102
1103 return len;
1104}
1105
1106static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1107 char *page)
1108{
1109 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1110 return 8;
1111}
1112
1113static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1114 const char *page, size_t len)
1115{
1116 struct usb_os_desc *desc = to_usb_os_desc(item);
1117 int l;
1118
1119 l = min_t(int, 8, len);
1120 if (page[l - 1] == '\n')
1121 --l;
1122 if (desc->opts_mutex)
1123 mutex_lock(desc->opts_mutex);
1124 memcpy(desc->ext_compat_id + 8, page, l);
1125
1126 if (desc->opts_mutex)
1127 mutex_unlock(desc->opts_mutex);
1128
1129 return len;
1130}
1131
1132CONFIGFS_ATTR(interf_grp_, compatible_id);
1133CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1134
1135static struct configfs_attribute *interf_grp_attrs[] = {
1136 &interf_grp_attr_compatible_id,
1137 &interf_grp_attr_sub_compatible_id,
1138 NULL
1139};
1140
1141int usb_os_desc_prepare_interf_dir(struct config_group *parent,
1142 int n_interf,
1143 struct usb_os_desc **desc,
1144 char **names,
1145 struct module *owner)
1146{
1147 struct config_group *os_desc_group;
1148 struct config_item_type *os_desc_type, *interface_type;
1149
1150 vla_group(data_chunk);
1151 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1152 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1153 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1154
1155 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1156 if (!vlabuf)
1157 return -ENOMEM;
1158
1159 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1160 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1161 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1162
1163 os_desc_type->ct_owner = owner;
1164 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1165 configfs_add_default_group(os_desc_group, parent);
1166
1167 interface_type->ct_group_ops = &interf_grp_ops;
1168 interface_type->ct_attrs = interf_grp_attrs;
1169 interface_type->ct_owner = owner;
1170
1171 while (n_interf--) {
1172 struct usb_os_desc *d;
1173
1174 d = desc[n_interf];
1175 d->owner = owner;
1176 config_group_init_type_name(&d->group, "", interface_type);
1177 config_item_set_name(&d->group.cg_item, "interface.%s",
1178 names[n_interf]);
1179 configfs_add_default_group(&d->group, os_desc_group);
1180 }
1181
1182 return 0;
1183}
1184EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1185
1186static int configfs_do_nothing(struct usb_composite_dev *cdev)
1187{
1188 WARN_ON(1);
1189 return -EINVAL;
1190}
1191
1192int composite_dev_prepare(struct usb_composite_driver *composite,
1193 struct usb_composite_dev *dev);
1194
1195int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1196 struct usb_ep *ep0);
1197
1198static void purge_configs_funcs(struct gadget_info *gi)
1199{
1200 struct usb_configuration *c;
1201
1202 list_for_each_entry(c, &gi->cdev.configs, list) {
1203 struct usb_function *f, *tmp;
1204 struct config_usb_cfg *cfg;
1205
1206 cfg = container_of(c, struct config_usb_cfg, c);
1207
1208 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1209
1210 list_move_tail(&f->list, &cfg->func_list);
1211 if (f->unbind) {
1212 dev_dbg(&gi->cdev.gadget->dev,
1213 "unbind function '%s'/%p\n",
1214 f->name, f);
1215 f->unbind(c, f);
1216 }
1217 }
1218 c->next_interface_id = 0;
1219 memset(c->interface, 0, sizeof(c->interface));
1220 c->superspeed_plus = 0;
1221 c->superspeed = 0;
1222 c->highspeed = 0;
1223 c->fullspeed = 0;
1224 }
1225}
1226
1227static int configfs_composite_bind(struct usb_gadget *gadget,
1228 struct usb_gadget_driver *gdriver)
1229{
1230 struct usb_composite_driver *composite = to_cdriver(gdriver);
1231 struct gadget_info *gi = container_of(composite,
1232 struct gadget_info, composite);
1233 struct usb_composite_dev *cdev = &gi->cdev;
1234 struct usb_configuration *c;
1235 struct usb_string *s;
1236 unsigned i;
1237 int ret;
1238
1239 /* the gi->lock is hold by the caller */
1240 cdev->gadget = gadget;
1241 set_gadget_data(gadget, cdev);
1242 ret = composite_dev_prepare(composite, cdev);
1243 if (ret)
1244 return ret;
1245 /* and now the gadget bind */
1246 ret = -EINVAL;
1247
1248 if (list_empty(&gi->cdev.configs)) {
1249 pr_err("Need at least one configuration in %s.\n",
1250 gi->composite.name);
1251 goto err_comp_cleanup;
1252 }
1253
1254
1255 list_for_each_entry(c, &gi->cdev.configs, list) {
1256 struct config_usb_cfg *cfg;
1257
1258 cfg = container_of(c, struct config_usb_cfg, c);
1259 if (list_empty(&cfg->func_list)) {
1260 pr_err("Config %s/%d of %s needs at least one function.\n",
1261 c->label, c->bConfigurationValue,
1262 gi->composite.name);
1263 goto err_comp_cleanup;
1264 }
1265 }
1266
1267 /* init all strings */
1268 if (!list_empty(&gi->string_list)) {
1269 struct gadget_strings *gs;
1270
1271 i = 0;
1272 list_for_each_entry(gs, &gi->string_list, list) {
1273
1274 gi->gstrings[i] = &gs->stringtab_dev;
1275 gs->stringtab_dev.strings = gs->strings;
1276 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1277 gs->manufacturer;
1278 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1279 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1280 i++;
1281 }
1282 gi->gstrings[i] = NULL;
1283 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1284 USB_GADGET_FIRST_AVAIL_IDX);
1285 if (IS_ERR(s)) {
1286 ret = PTR_ERR(s);
1287 goto err_comp_cleanup;
1288 }
1289
1290 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1291 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1292 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1293 }
1294
1295 if (gi->use_os_desc) {
1296 cdev->use_os_string = true;
1297 cdev->b_vendor_code = gi->b_vendor_code;
1298 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1299 }
1300
1301 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1302 struct usb_descriptor_header *usb_desc;
1303
1304 usb_desc = usb_otg_descriptor_alloc(gadget);
1305 if (!usb_desc) {
1306 ret = -ENOMEM;
1307 goto err_comp_cleanup;
1308 }
1309 usb_otg_descriptor_init(gadget, usb_desc);
1310 otg_desc[0] = usb_desc;
1311 otg_desc[1] = NULL;
1312 }
1313
1314 /* Go through all configs, attach all functions */
1315 list_for_each_entry(c, &gi->cdev.configs, list) {
1316 struct config_usb_cfg *cfg;
1317 struct usb_function *f;
1318 struct usb_function *tmp;
1319 struct gadget_config_name *cn;
1320
1321 if (gadget_is_otg(gadget))
1322 c->descriptors = otg_desc;
1323
1324 cfg = container_of(c, struct config_usb_cfg, c);
1325 if (!list_empty(&cfg->string_list)) {
1326 i = 0;
1327 list_for_each_entry(cn, &cfg->string_list, list) {
1328 cfg->gstrings[i] = &cn->stringtab_dev;
1329 cn->stringtab_dev.strings = &cn->strings;
1330 cn->strings.s = cn->configuration;
1331 i++;
1332 }
1333 cfg->gstrings[i] = NULL;
1334 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1335 if (IS_ERR(s)) {
1336 ret = PTR_ERR(s);
1337 goto err_comp_cleanup;
1338 }
1339 c->iConfiguration = s[0].id;
1340 }
1341
1342 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1343 list_del(&f->list);
1344 ret = usb_add_function(c, f);
1345 if (ret) {
1346 list_add(&f->list, &cfg->func_list);
1347 goto err_purge_funcs;
1348 }
1349 }
1350 usb_ep_autoconfig_reset(cdev->gadget);
1351 }
1352 if (cdev->use_os_string) {
1353 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1354 if (ret)
1355 goto err_purge_funcs;
1356 }
1357
1358 usb_ep_autoconfig_reset(cdev->gadget);
1359 return 0;
1360
1361err_purge_funcs:
1362 purge_configs_funcs(gi);
1363err_comp_cleanup:
1364 composite_dev_cleanup(cdev);
1365 return ret;
1366}
1367
1368static void configfs_composite_unbind(struct usb_gadget *gadget)
1369{
1370 struct usb_composite_dev *cdev;
1371 struct gadget_info *gi;
1372
1373 /* the gi->lock is hold by the caller */
1374
1375 cdev = get_gadget_data(gadget);
1376 gi = container_of(cdev, struct gadget_info, cdev);
1377
1378 kfree(otg_desc[0]);
1379 otg_desc[0] = NULL;
1380 purge_configs_funcs(gi);
1381 composite_dev_cleanup(cdev);
1382 usb_ep_autoconfig_reset(cdev->gadget);
1383 cdev->gadget = NULL;
1384 set_gadget_data(gadget, NULL);
1385}
1386
1387static const struct usb_gadget_driver configfs_driver_template = {
1388 .bind = configfs_composite_bind,
1389 .unbind = configfs_composite_unbind,
1390
1391 .setup = composite_setup,
1392 .reset = composite_disconnect,
1393 .disconnect = composite_disconnect,
1394
1395 .suspend = composite_suspend,
1396 .resume = composite_resume,
1397
1398 .max_speed = USB_SPEED_SUPER,
1399 .driver = {
1400 .owner = THIS_MODULE,
1401 .name = "configfs-gadget",
1402 },
1403 .match_existing_only = 1,
1404};
1405
1406static struct config_group *gadgets_make(
1407 struct config_group *group,
1408 const char *name)
1409{
1410 struct gadget_info *gi;
1411
1412 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1413 if (!gi)
1414 return ERR_PTR(-ENOMEM);
1415
1416 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1417
1418 config_group_init_type_name(&gi->functions_group, "functions",
1419 &functions_type);
1420 configfs_add_default_group(&gi->functions_group, &gi->group);
1421
1422 config_group_init_type_name(&gi->configs_group, "configs",
1423 &config_desc_type);
1424 configfs_add_default_group(&gi->configs_group, &gi->group);
1425
1426 config_group_init_type_name(&gi->strings_group, "strings",
1427 &gadget_strings_strings_type);
1428 configfs_add_default_group(&gi->strings_group, &gi->group);
1429
1430 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1431 &os_desc_type);
1432 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1433
1434 gi->composite.bind = configfs_do_nothing;
1435 gi->composite.unbind = configfs_do_nothing;
1436 gi->composite.suspend = NULL;
1437 gi->composite.resume = NULL;
1438 gi->composite.max_speed = USB_SPEED_SUPER;
1439
1440 mutex_init(&gi->lock);
1441 INIT_LIST_HEAD(&gi->string_list);
1442 INIT_LIST_HEAD(&gi->available_func);
1443
1444 composite_init_dev(&gi->cdev);
1445 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1446 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1447 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1448
1449 gi->composite.gadget_driver = configfs_driver_template;
1450
1451 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1452 gi->composite.name = gi->composite.gadget_driver.function;
1453
1454 if (!gi->composite.gadget_driver.function)
1455 goto err;
1456
1457 return &gi->group;
1458err:
1459 kfree(gi);
1460 return ERR_PTR(-ENOMEM);
1461}
1462
1463static void gadgets_drop(struct config_group *group, struct config_item *item)
1464{
1465 config_item_put(item);
1466}
1467
1468static struct configfs_group_operations gadgets_ops = {
1469 .make_group = &gadgets_make,
1470 .drop_item = &gadgets_drop,
1471};
1472
1473static struct config_item_type gadgets_type = {
1474 .ct_group_ops = &gadgets_ops,
1475 .ct_owner = THIS_MODULE,
1476};
1477
1478static struct configfs_subsystem gadget_subsys = {
1479 .su_group = {
1480 .cg_item = {
1481 .ci_namebuf = "usb_gadget",
1482 .ci_type = &gadgets_type,
1483 },
1484 },
1485 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1486};
1487
1488void unregister_gadget_item(struct config_item *item)
1489{
1490 struct gadget_info *gi = to_gadget_info(item);
1491
1492 mutex_lock(&gi->lock);
1493 unregister_gadget(gi);
1494 mutex_unlock(&gi->lock);
1495}
1496EXPORT_SYMBOL_GPL(unregister_gadget_item);
1497
1498static int __init gadget_cfs_init(void)
1499{
1500 int ret;
1501
1502 config_group_init(&gadget_subsys.su_group);
1503
1504 ret = configfs_register_subsystem(&gadget_subsys);
1505 return ret;
1506}
1507module_init(gadget_cfs_init);
1508
1509static void __exit gadget_cfs_exit(void)
1510{
1511 configfs_unregister_subsystem(&gadget_subsys);
1512}
1513module_exit(gadget_cfs_exit);