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 <linux/usb/webusb.h>
  11#include "configfs.h"
  12#include "u_f.h"
  13#include "u_os_desc.h"
  14
  15int check_user_usb_string(const char *name,
  16		struct usb_gadget_strings *stringtab_dev)
  17{
  18	u16 num;
  19	int ret;
  20
  21	ret = kstrtou16(name, 0, &num);
  22	if (ret)
  23		return ret;
  24
  25	if (!usb_validate_langid(num))
  26		return -EINVAL;
  27
  28	stringtab_dev->language = num;
  29	return 0;
  30}
  31
  32#define MAX_NAME_LEN	40
  33#define MAX_USB_STRING_LANGS 2
  34
  35static const struct usb_descriptor_header *otg_desc[2];
  36
  37struct gadget_info {
  38	struct config_group group;
  39	struct config_group functions_group;
  40	struct config_group configs_group;
  41	struct config_group strings_group;
  42	struct config_group os_desc_group;
  43	struct config_group webusb_group;
  44
  45	struct mutex lock;
  46	struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
  47	struct list_head string_list;
  48	struct list_head available_func;
  49
  50	struct usb_composite_driver composite;
  51	struct usb_composite_dev cdev;
  52	bool use_os_desc;
  53	char b_vendor_code;
  54	char qw_sign[OS_STRING_QW_SIGN_LEN];
  55	bool use_webusb;
  56	u16 bcd_webusb_version;
  57	u8 b_webusb_vendor_code;
  58	char landing_page[WEBUSB_URL_RAW_MAX_LENGTH];
  59
  60	spinlock_t spinlock;
  61	bool unbind;
  62};
  63
  64static inline struct gadget_info *to_gadget_info(struct config_item *item)
  65{
  66	return container_of(to_config_group(item), struct gadget_info, group);
  67}
  68
  69struct config_usb_cfg {
  70	struct config_group group;
  71	struct config_group strings_group;
  72	struct list_head string_list;
  73	struct usb_configuration c;
  74	struct list_head func_list;
  75	struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
  76};
  77
  78static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
  79{
  80	return container_of(to_config_group(item), struct config_usb_cfg,
  81			group);
  82}
  83
  84static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg)
  85{
  86	return container_of(cfg->c.cdev, struct gadget_info, cdev);
  87}
  88
  89struct gadget_language {
  90	struct usb_gadget_strings stringtab_dev;
  91	struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
  92	char *manufacturer;
  93	char *product;
  94	char *serialnumber;
  95
  96	struct config_group group;
  97	struct list_head list;
  98	struct list_head gadget_strings;
  99	unsigned int nstrings;
 100};
 101
 102struct gadget_config_name {
 103	struct usb_gadget_strings stringtab_dev;
 104	struct usb_string strings;
 105	char *configuration;
 106
 107	struct config_group group;
 108	struct list_head list;
 109};
 110
 111#define USB_MAX_STRING_WITH_NULL_LEN	(USB_MAX_STRING_LEN+1)
 112
 113static int usb_string_copy(const char *s, char **s_copy)
 114{
 115	int ret;
 116	char *str;
 117	char *copy = *s_copy;
 
 118	ret = strlen(s);
 119	if (ret > USB_MAX_STRING_LEN)
 120		return -EOVERFLOW;
 
 
 121
 122	if (copy) {
 123		str = copy;
 124	} else {
 125		str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
 126		if (!str)
 127			return -ENOMEM;
 128	}
 129	strcpy(str, s);
 130	if (str[ret - 1] == '\n')
 131		str[ret - 1] = '\0';
 132	*s_copy = str;
 133	return 0;
 134}
 135
 136#define GI_DEVICE_DESC_SIMPLE_R_u8(__name)	\
 137static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
 138			char *page)	\
 139{	\
 140	return sprintf(page, "0x%02x\n", \
 141		to_gadget_info(item)->cdev.desc.__name); \
 142}
 143
 144#define GI_DEVICE_DESC_SIMPLE_R_u16(__name)	\
 145static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
 146			char *page)	\
 147{	\
 148	return sprintf(page, "0x%04x\n", \
 149		le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
 150}
 151
 152
 153#define GI_DEVICE_DESC_SIMPLE_W_u8(_name)		\
 154static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 155		const char *page, size_t len)		\
 156{							\
 157	u8 val;						\
 158	int ret;					\
 159	ret = kstrtou8(page, 0, &val);			\
 160	if (ret)					\
 161		return ret;				\
 162	to_gadget_info(item)->cdev.desc._name = val;	\
 163	return len;					\
 164}
 165
 166#define GI_DEVICE_DESC_SIMPLE_W_u16(_name)	\
 167static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 168		const char *page, size_t len)		\
 169{							\
 170	u16 val;					\
 171	int ret;					\
 172	ret = kstrtou16(page, 0, &val);			\
 173	if (ret)					\
 174		return ret;				\
 175	to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val);	\
 176	return len;					\
 177}
 178
 179#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type)	\
 180	GI_DEVICE_DESC_SIMPLE_R_##_type(_name)	\
 181	GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
 182
 183GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
 184GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
 185GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
 186GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
 187GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
 188GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
 189GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
 190GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
 191
 192static ssize_t is_valid_bcd(u16 bcd_val)
 193{
 194	if ((bcd_val & 0xf) > 9)
 195		return -EINVAL;
 196	if (((bcd_val >> 4) & 0xf) > 9)
 197		return -EINVAL;
 198	if (((bcd_val >> 8) & 0xf) > 9)
 199		return -EINVAL;
 200	if (((bcd_val >> 12) & 0xf) > 9)
 201		return -EINVAL;
 202	return 0;
 203}
 204
 205static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
 206		const char *page, size_t len)
 207{
 208	u16 bcdDevice;
 209	int ret;
 210
 211	ret = kstrtou16(page, 0, &bcdDevice);
 212	if (ret)
 213		return ret;
 214	ret = is_valid_bcd(bcdDevice);
 215	if (ret)
 216		return ret;
 217
 218	to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
 219	return len;
 220}
 221
 222static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
 223		const char *page, size_t len)
 224{
 225	u16 bcdUSB;
 226	int ret;
 227
 228	ret = kstrtou16(page, 0, &bcdUSB);
 229	if (ret)
 230		return ret;
 231	ret = is_valid_bcd(bcdUSB);
 232	if (ret)
 233		return ret;
 234
 235	to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
 236	return len;
 237}
 238
 239static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
 240{
 241	struct gadget_info *gi = to_gadget_info(item);
 242	char *udc_name;
 243	int ret;
 244
 245	mutex_lock(&gi->lock);
 246	udc_name = gi->composite.gadget_driver.udc_name;
 247	ret = sprintf(page, "%s\n", udc_name ?: "");
 248	mutex_unlock(&gi->lock);
 249
 250	return ret;
 251}
 252
 253static int unregister_gadget(struct gadget_info *gi)
 254{
 255	int ret;
 256
 257	if (!gi->composite.gadget_driver.udc_name)
 258		return -ENODEV;
 259
 260	ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
 261	if (ret)
 262		return ret;
 263	kfree(gi->composite.gadget_driver.udc_name);
 264	gi->composite.gadget_driver.udc_name = NULL;
 265	return 0;
 266}
 267
 268static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
 269		const char *page, size_t len)
 270{
 271	struct gadget_info *gi = to_gadget_info(item);
 272	char *name;
 273	int ret;
 274
 275	if (strlen(page) < len)
 276		return -EOVERFLOW;
 277
 278	name = kstrdup(page, GFP_KERNEL);
 279	if (!name)
 280		return -ENOMEM;
 281	if (name[len - 1] == '\n')
 282		name[len - 1] = '\0';
 283
 284	mutex_lock(&gi->lock);
 285
 286	if (!strlen(name)) {
 287		ret = unregister_gadget(gi);
 288		if (ret)
 289			goto err;
 290		kfree(name);
 291	} else {
 292		if (gi->composite.gadget_driver.udc_name) {
 293			ret = -EBUSY;
 294			goto err;
 295		}
 296		gi->composite.gadget_driver.udc_name = name;
 297		ret = usb_gadget_register_driver(&gi->composite.gadget_driver);
 298		if (ret) {
 299			gi->composite.gadget_driver.udc_name = NULL;
 300			goto err;
 301		}
 302	}
 303	mutex_unlock(&gi->lock);
 304	return len;
 305err:
 306	kfree(name);
 307	mutex_unlock(&gi->lock);
 308	return ret;
 309}
 310
 311static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
 312					      char *page)
 313{
 314	enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
 315
 316	return sprintf(page, "%s\n", usb_speed_string(speed));
 317}
 318
 319static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
 320					       const char *page, size_t len)
 321{
 322	struct gadget_info *gi = to_gadget_info(item);
 323
 324	mutex_lock(&gi->lock);
 325
 326	/* Prevent changing of max_speed after the driver is binded */
 327	if (gi->composite.gadget_driver.udc_name)
 328		goto err;
 329
 330	if (strncmp(page, "super-speed-plus", 16) == 0)
 331		gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
 332	else if (strncmp(page, "super-speed", 11) == 0)
 333		gi->composite.max_speed = USB_SPEED_SUPER;
 334	else if (strncmp(page, "high-speed", 10) == 0)
 335		gi->composite.max_speed = USB_SPEED_HIGH;
 336	else if (strncmp(page, "full-speed", 10) == 0)
 337		gi->composite.max_speed = USB_SPEED_FULL;
 338	else if (strncmp(page, "low-speed", 9) == 0)
 339		gi->composite.max_speed = USB_SPEED_LOW;
 340	else
 341		goto err;
 342
 343	gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
 344
 345	mutex_unlock(&gi->lock);
 346	return len;
 347err:
 348	mutex_unlock(&gi->lock);
 349	return -EINVAL;
 350}
 351
 352CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
 353CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
 354CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
 355CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
 356CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
 357CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
 358CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
 359CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
 360CONFIGFS_ATTR(gadget_dev_desc_, UDC);
 361CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
 362
 363static struct configfs_attribute *gadget_root_attrs[] = {
 364	&gadget_dev_desc_attr_bDeviceClass,
 365	&gadget_dev_desc_attr_bDeviceSubClass,
 366	&gadget_dev_desc_attr_bDeviceProtocol,
 367	&gadget_dev_desc_attr_bMaxPacketSize0,
 368	&gadget_dev_desc_attr_idVendor,
 369	&gadget_dev_desc_attr_idProduct,
 370	&gadget_dev_desc_attr_bcdDevice,
 371	&gadget_dev_desc_attr_bcdUSB,
 372	&gadget_dev_desc_attr_UDC,
 373	&gadget_dev_desc_attr_max_speed,
 374	NULL,
 375};
 376
 377static inline struct gadget_language *to_gadget_language(struct config_item *item)
 378{
 379	return container_of(to_config_group(item), struct gadget_language,
 380			 group);
 381}
 382
 383static inline struct gadget_config_name *to_gadget_config_name(
 384		struct config_item *item)
 385{
 386	return container_of(to_config_group(item), struct gadget_config_name,
 387			 group);
 388}
 389
 390static inline struct usb_function_instance *to_usb_function_instance(
 391		struct config_item *item)
 392{
 393	return container_of(to_config_group(item),
 394			 struct usb_function_instance, group);
 395}
 396
 397static void gadget_info_attr_release(struct config_item *item)
 398{
 399	struct gadget_info *gi = to_gadget_info(item);
 400
 401	WARN_ON(!list_empty(&gi->cdev.configs));
 402	WARN_ON(!list_empty(&gi->string_list));
 403	WARN_ON(!list_empty(&gi->available_func));
 404	kfree(gi->composite.gadget_driver.function);
 405	kfree(gi->composite.gadget_driver.driver.name);
 406	kfree(gi);
 407}
 408
 409static struct configfs_item_operations gadget_root_item_ops = {
 410	.release                = gadget_info_attr_release,
 411};
 412
 413static void gadget_config_attr_release(struct config_item *item)
 414{
 415	struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 416
 417	WARN_ON(!list_empty(&cfg->c.functions));
 418	list_del(&cfg->c.list);
 419	kfree(cfg->c.label);
 420	kfree(cfg);
 421}
 422
 423static int config_usb_cfg_link(
 424	struct config_item *usb_cfg_ci,
 425	struct config_item *usb_func_ci)
 426{
 427	struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 428	struct gadget_info *gi = cfg_to_gadget_info(cfg);
 429
 430	struct usb_function_instance *fi =
 431			to_usb_function_instance(usb_func_ci);
 432	struct usb_function_instance *a_fi = NULL, *iter;
 433	struct usb_function *f;
 434	int ret;
 435
 436	mutex_lock(&gi->lock);
 437	/*
 438	 * Make sure this function is from within our _this_ gadget and not
 439	 * from another gadget or a random directory.
 440	 * Also a function instance can only be linked once.
 441	 */
 442
 443	if (gi->composite.gadget_driver.udc_name) {
 444		ret = -EINVAL;
 445		goto out;
 446	}
 447
 448	list_for_each_entry(iter, &gi->available_func, cfs_list) {
 449		if (iter != fi)
 450			continue;
 451		a_fi = iter;
 452		break;
 453	}
 454	if (!a_fi) {
 455		ret = -EINVAL;
 456		goto out;
 457	}
 458
 459	list_for_each_entry(f, &cfg->func_list, list) {
 460		if (f->fi == fi) {
 461			ret = -EEXIST;
 462			goto out;
 463		}
 464	}
 465
 466	f = usb_get_function(fi);
 467	if (IS_ERR(f)) {
 468		ret = PTR_ERR(f);
 469		goto out;
 470	}
 471
 472	/* stash the function until we bind it to the gadget */
 473	list_add_tail(&f->list, &cfg->func_list);
 474	ret = 0;
 475out:
 476	mutex_unlock(&gi->lock);
 477	return ret;
 478}
 479
 480static void config_usb_cfg_unlink(
 481	struct config_item *usb_cfg_ci,
 482	struct config_item *usb_func_ci)
 483{
 484	struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 485	struct gadget_info *gi = cfg_to_gadget_info(cfg);
 486
 487	struct usb_function_instance *fi =
 488			to_usb_function_instance(usb_func_ci);
 489	struct usb_function *f;
 490
 491	/*
 492	 * ideally I would like to forbid to unlink functions while a gadget is
 493	 * bound to an UDC. Since this isn't possible at the moment, we simply
 494	 * force an unbind, the function is available here and then we can
 495	 * remove the function.
 496	 */
 497	mutex_lock(&gi->lock);
 498	if (gi->composite.gadget_driver.udc_name)
 499		unregister_gadget(gi);
 500	WARN_ON(gi->composite.gadget_driver.udc_name);
 501
 502	list_for_each_entry(f, &cfg->func_list, list) {
 503		if (f->fi == fi) {
 504			list_del(&f->list);
 505			usb_put_function(f);
 506			mutex_unlock(&gi->lock);
 507			return;
 508		}
 509	}
 510	mutex_unlock(&gi->lock);
 511	WARN(1, "Unable to locate function to unbind\n");
 512}
 513
 514static struct configfs_item_operations gadget_config_item_ops = {
 515	.release                = gadget_config_attr_release,
 516	.allow_link             = config_usb_cfg_link,
 517	.drop_link              = config_usb_cfg_unlink,
 518};
 519
 520
 521static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
 522		char *page)
 523{
 524	struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 525
 526	return sprintf(page, "%u\n", cfg->c.MaxPower);
 527}
 528
 529static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
 530		const char *page, size_t len)
 531{
 532	struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 533	u16 val;
 534	int ret;
 535	ret = kstrtou16(page, 0, &val);
 536	if (ret)
 537		return ret;
 538	if (DIV_ROUND_UP(val, 8) > 0xff)
 539		return -ERANGE;
 540	cfg->c.MaxPower = val;
 541	return len;
 542}
 543
 544static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
 545		char *page)
 546{
 547	struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 548
 549	return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
 550}
 551
 552static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
 553		const char *page, size_t len)
 554{
 555	struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 556	u8 val;
 557	int ret;
 558	ret = kstrtou8(page, 0, &val);
 559	if (ret)
 560		return ret;
 561	if (!(val & USB_CONFIG_ATT_ONE))
 562		return -EINVAL;
 563	if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
 564				USB_CONFIG_ATT_WAKEUP))
 565		return -EINVAL;
 566	cfg->c.bmAttributes = val;
 567	return len;
 568}
 569
 570CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
 571CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
 572
 573static struct configfs_attribute *gadget_config_attrs[] = {
 574	&gadget_config_desc_attr_MaxPower,
 575	&gadget_config_desc_attr_bmAttributes,
 576	NULL,
 577};
 578
 579static const struct config_item_type gadget_config_type = {
 580	.ct_item_ops	= &gadget_config_item_ops,
 581	.ct_attrs	= gadget_config_attrs,
 582	.ct_owner	= THIS_MODULE,
 583};
 584
 585static const struct config_item_type gadget_root_type = {
 586	.ct_item_ops	= &gadget_root_item_ops,
 587	.ct_attrs	= gadget_root_attrs,
 588	.ct_owner	= THIS_MODULE,
 589};
 590
 591static void composite_init_dev(struct usb_composite_dev *cdev)
 592{
 593	spin_lock_init(&cdev->lock);
 594	INIT_LIST_HEAD(&cdev->configs);
 595	INIT_LIST_HEAD(&cdev->gstrings);
 596}
 597
 598static struct config_group *function_make(
 599		struct config_group *group,
 600		const char *name)
 601{
 602	struct gadget_info *gi;
 603	struct usb_function_instance *fi;
 604	char buf[MAX_NAME_LEN];
 605	char *func_name;
 606	char *instance_name;
 607	int ret;
 608
 609	if (strlen(name) >= MAX_NAME_LEN)
 610		return ERR_PTR(-ENAMETOOLONG);
 611
 612	scnprintf(buf, MAX_NAME_LEN, "%s", name);
 613
 614	func_name = buf;
 615	instance_name = strchr(func_name, '.');
 616	if (!instance_name) {
 617		pr_err("Unable to locate . in FUNC.INSTANCE\n");
 618		return ERR_PTR(-EINVAL);
 619	}
 620	*instance_name = '\0';
 621	instance_name++;
 622
 623	fi = usb_get_function_instance(func_name);
 624	if (IS_ERR(fi))
 625		return ERR_CAST(fi);
 626
 627	ret = config_item_set_name(&fi->group.cg_item, "%s", name);
 628	if (ret) {
 629		usb_put_function_instance(fi);
 630		return ERR_PTR(ret);
 631	}
 632	if (fi->set_inst_name) {
 633		ret = fi->set_inst_name(fi, instance_name);
 634		if (ret) {
 635			usb_put_function_instance(fi);
 636			return ERR_PTR(ret);
 637		}
 638	}
 639
 640	gi = container_of(group, struct gadget_info, functions_group);
 641
 642	mutex_lock(&gi->lock);
 643	list_add_tail(&fi->cfs_list, &gi->available_func);
 644	mutex_unlock(&gi->lock);
 645	return &fi->group;
 646}
 647
 648static void function_drop(
 649		struct config_group *group,
 650		struct config_item *item)
 651{
 652	struct usb_function_instance *fi = to_usb_function_instance(item);
 653	struct gadget_info *gi;
 654
 655	gi = container_of(group, struct gadget_info, functions_group);
 656
 657	mutex_lock(&gi->lock);
 658	list_del(&fi->cfs_list);
 659	mutex_unlock(&gi->lock);
 660	config_item_put(item);
 661}
 662
 663static struct configfs_group_operations functions_ops = {
 664	.make_group     = &function_make,
 665	.drop_item      = &function_drop,
 666};
 667
 668static const struct config_item_type functions_type = {
 669	.ct_group_ops   = &functions_ops,
 670	.ct_owner       = THIS_MODULE,
 671};
 672
 673GS_STRINGS_RW(gadget_config_name, configuration);
 674
 675static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
 676	&gadget_config_name_attr_configuration,
 677	NULL,
 678};
 679
 680static void gadget_config_name_attr_release(struct config_item *item)
 681{
 682	struct gadget_config_name *cn = to_gadget_config_name(item);
 683
 684	kfree(cn->configuration);
 685
 686	list_del(&cn->list);
 687	kfree(cn);
 688}
 689
 690USB_CONFIG_STRING_RW_OPS(gadget_config_name);
 691USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
 692
 693static struct config_group *config_desc_make(
 694		struct config_group *group,
 695		const char *name)
 696{
 697	struct gadget_info *gi;
 698	struct config_usb_cfg *cfg;
 699	char buf[MAX_NAME_LEN];
 700	char *num_str;
 701	u8 num;
 702	int ret;
 703
 704	gi = container_of(group, struct gadget_info, configs_group);
 705
 706	if (strlen(name) >= MAX_NAME_LEN)
 707		return ERR_PTR(-ENAMETOOLONG);
 708
 709	scnprintf(buf, MAX_NAME_LEN, "%s", name);
 710
 711	num_str = strchr(buf, '.');
 712	if (!num_str) {
 713		pr_err("Unable to locate . in name.bConfigurationValue\n");
 714		return ERR_PTR(-EINVAL);
 715	}
 716
 717	*num_str = '\0';
 718	num_str++;
 719
 720	if (!strlen(buf))
 721		return ERR_PTR(-EINVAL);
 722
 723	ret = kstrtou8(num_str, 0, &num);
 724	if (ret)
 725		return ERR_PTR(ret);
 726
 727	cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 728	if (!cfg)
 729		return ERR_PTR(-ENOMEM);
 730	cfg->c.label = kstrdup(buf, GFP_KERNEL);
 731	if (!cfg->c.label) {
 732		ret = -ENOMEM;
 733		goto err;
 734	}
 735	cfg->c.bConfigurationValue = num;
 736	cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
 737	cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
 738	INIT_LIST_HEAD(&cfg->string_list);
 739	INIT_LIST_HEAD(&cfg->func_list);
 740
 741	config_group_init_type_name(&cfg->group, name,
 742				&gadget_config_type);
 743
 744	config_group_init_type_name(&cfg->strings_group, "strings",
 745			&gadget_config_name_strings_type);
 746	configfs_add_default_group(&cfg->strings_group, &cfg->group);
 747
 748	ret = usb_add_config_only(&gi->cdev, &cfg->c);
 749	if (ret)
 750		goto err;
 751
 752	return &cfg->group;
 753err:
 754	kfree(cfg->c.label);
 755	kfree(cfg);
 756	return ERR_PTR(ret);
 757}
 758
 759static void config_desc_drop(
 760		struct config_group *group,
 761		struct config_item *item)
 762{
 763	config_item_put(item);
 764}
 765
 766static struct configfs_group_operations config_desc_ops = {
 767	.make_group     = &config_desc_make,
 768	.drop_item      = &config_desc_drop,
 769};
 770
 771static const struct config_item_type config_desc_type = {
 772	.ct_group_ops   = &config_desc_ops,
 773	.ct_owner       = THIS_MODULE,
 774};
 775
 776GS_STRINGS_RW(gadget_language, manufacturer);
 777GS_STRINGS_RW(gadget_language, product);
 778GS_STRINGS_RW(gadget_language, serialnumber);
 779
 780static struct configfs_attribute *gadget_language_langid_attrs[] = {
 781	&gadget_language_attr_manufacturer,
 782	&gadget_language_attr_product,
 783	&gadget_language_attr_serialnumber,
 784	NULL,
 785};
 786
 787static void gadget_language_attr_release(struct config_item *item)
 788{
 789	struct gadget_language *gs = to_gadget_language(item);
 790
 791	kfree(gs->manufacturer);
 792	kfree(gs->product);
 793	kfree(gs->serialnumber);
 794
 795	list_del(&gs->list);
 796	kfree(gs);
 797}
 798
 799static struct configfs_item_operations gadget_language_langid_item_ops = {
 800	.release                = gadget_language_attr_release,
 801};
 802
 803static ssize_t gadget_string_id_show(struct config_item *item, char *page)
 804{
 805	struct gadget_string *string = to_gadget_string(item);
 806	int ret;
 807
 808	ret = sprintf(page, "%u\n", string->usb_string.id);
 809	return ret;
 810}
 811CONFIGFS_ATTR_RO(gadget_string_, id);
 812
 813static ssize_t gadget_string_s_show(struct config_item *item, char *page)
 814{
 815	struct gadget_string *string = to_gadget_string(item);
 816	int ret;
 817
 818	ret = sysfs_emit(page, "%s\n", string->string);
 819	return ret;
 820}
 821
 822static ssize_t gadget_string_s_store(struct config_item *item, const char *page,
 823				     size_t len)
 824{
 825	struct gadget_string *string = to_gadget_string(item);
 826	int size = min(sizeof(string->string), len + 1);
 
 827
 828	if (len > USB_MAX_STRING_LEN)
 829		return -EINVAL;
 830
 831	return strscpy(string->string, page, size);
 
 
 
 832}
 833CONFIGFS_ATTR(gadget_string_, s);
 834
 835static struct configfs_attribute *gadget_string_attrs[] = {
 836	&gadget_string_attr_id,
 837	&gadget_string_attr_s,
 838	NULL,
 839};
 840
 841static void gadget_string_release(struct config_item *item)
 842{
 843	struct gadget_string *string = to_gadget_string(item);
 844
 845	kfree(string);
 846}
 847
 848static struct configfs_item_operations gadget_string_item_ops = {
 849	.release	= gadget_string_release,
 850};
 851
 852static const struct config_item_type gadget_string_type = {
 853	.ct_item_ops	= &gadget_string_item_ops,
 854	.ct_attrs	= gadget_string_attrs,
 855	.ct_owner	= THIS_MODULE,
 856};
 857
 858static struct config_item *gadget_language_string_make(struct config_group *group,
 859						       const char *name)
 860{
 861	struct gadget_language *language;
 862	struct gadget_string *string;
 863
 864	language = to_gadget_language(&group->cg_item);
 865
 866	string = kzalloc(sizeof(*string), GFP_KERNEL);
 867	if (!string)
 868		return ERR_PTR(-ENOMEM);
 869
 870	string->usb_string.id = language->nstrings++;
 871	string->usb_string.s = string->string;
 872	list_add_tail(&string->list, &language->gadget_strings);
 873
 874	config_item_init_type_name(&string->item, name, &gadget_string_type);
 875
 876	return &string->item;
 877}
 878
 879static void gadget_language_string_drop(struct config_group *group,
 880					struct config_item *item)
 881{
 882	struct gadget_language *language;
 883	struct gadget_string *string;
 884	unsigned int i = USB_GADGET_FIRST_AVAIL_IDX;
 885
 886	language = to_gadget_language(&group->cg_item);
 887	string = to_gadget_string(item);
 888
 889	list_del(&string->list);
 890	language->nstrings--;
 891
 892	/* Reset the ids for the language's strings to guarantee a continuous set */
 893	list_for_each_entry(string, &language->gadget_strings, list)
 894		string->usb_string.id = i++;
 895}
 896
 897static struct configfs_group_operations gadget_language_langid_group_ops = {
 898	.make_item		= gadget_language_string_make,
 899	.drop_item		= gadget_language_string_drop,
 900};
 901
 902static struct config_item_type gadget_language_type = {
 903	.ct_item_ops	= &gadget_language_langid_item_ops,
 904	.ct_group_ops	= &gadget_language_langid_group_ops,
 905	.ct_attrs	= gadget_language_langid_attrs,
 906	.ct_owner	= THIS_MODULE,
 907};
 908
 909static struct config_group *gadget_language_make(struct config_group *group,
 910						 const char *name)
 911{
 912	struct gadget_info *gi;
 913	struct gadget_language *gs;
 914	struct gadget_language *new;
 915	int langs = 0;
 916	int ret;
 917
 918	new = kzalloc(sizeof(*new), GFP_KERNEL);
 919	if (!new)
 920		return ERR_PTR(-ENOMEM);
 921
 922	ret = check_user_usb_string(name, &new->stringtab_dev);
 923	if (ret)
 924		goto err;
 925	config_group_init_type_name(&new->group, name,
 926				    &gadget_language_type);
 927
 928	gi = container_of(group, struct gadget_info, strings_group);
 929	ret = -EEXIST;
 930	list_for_each_entry(gs, &gi->string_list, list) {
 931		if (gs->stringtab_dev.language == new->stringtab_dev.language)
 932			goto err;
 933		langs++;
 934	}
 935	ret = -EOVERFLOW;
 936	if (langs >= MAX_USB_STRING_LANGS)
 937		goto err;
 938
 939	list_add_tail(&new->list, &gi->string_list);
 940	INIT_LIST_HEAD(&new->gadget_strings);
 941
 942	/* We have the default manufacturer, product and serialnumber strings */
 943	new->nstrings = 3;
 944	return &new->group;
 945err:
 946	kfree(new);
 947	return ERR_PTR(ret);
 948}
 949
 950static void gadget_language_drop(struct config_group *group,
 951				 struct config_item *item)
 952{
 953	config_item_put(item);
 954}
 955
 956static struct configfs_group_operations gadget_language_group_ops = {
 957	.make_group     = &gadget_language_make,
 958	.drop_item      = &gadget_language_drop,
 959};
 960
 961static struct config_item_type gadget_language_strings_type = {
 962	.ct_group_ops   = &gadget_language_group_ops,
 963	.ct_owner       = THIS_MODULE,
 964};
 965
 966static inline struct gadget_info *webusb_item_to_gadget_info(
 967		struct config_item *item)
 968{
 969	return container_of(to_config_group(item),
 970			struct gadget_info, webusb_group);
 971}
 972
 973static ssize_t webusb_use_show(struct config_item *item, char *page)
 974{
 975	return sysfs_emit(page, "%d\n",
 976			webusb_item_to_gadget_info(item)->use_webusb);
 977}
 978
 979static ssize_t webusb_use_store(struct config_item *item, const char *page,
 980				 size_t len)
 981{
 982	struct gadget_info *gi = webusb_item_to_gadget_info(item);
 983	int ret;
 984	bool use;
 985
 986	ret = kstrtobool(page, &use);
 987	if (ret)
 988		return ret;
 989
 990	mutex_lock(&gi->lock);
 991	gi->use_webusb = use;
 992	mutex_unlock(&gi->lock);
 993
 994	return len;
 995}
 996
 997static ssize_t webusb_bcdVersion_show(struct config_item *item, char *page)
 998{
 999	return sysfs_emit(page, "0x%04x\n",
1000					webusb_item_to_gadget_info(item)->bcd_webusb_version);
1001}
1002
1003static ssize_t webusb_bcdVersion_store(struct config_item *item,
1004		const char *page, size_t len)
1005{
1006	struct gadget_info *gi = webusb_item_to_gadget_info(item);
1007	u16 bcdVersion;
1008	int ret;
1009
1010	ret = kstrtou16(page, 0, &bcdVersion);
1011	if (ret)
1012		return ret;
1013
1014	ret = is_valid_bcd(bcdVersion);
1015	if (ret)
1016		return ret;
1017
1018	mutex_lock(&gi->lock);
1019	gi->bcd_webusb_version = bcdVersion;
1020	mutex_unlock(&gi->lock);
1021
1022	return len;
1023}
1024
1025static ssize_t webusb_bVendorCode_show(struct config_item *item, char *page)
1026{
1027	return sysfs_emit(page, "0x%02x\n",
1028			webusb_item_to_gadget_info(item)->b_webusb_vendor_code);
1029}
1030
1031static ssize_t webusb_bVendorCode_store(struct config_item *item,
1032					   const char *page, size_t len)
1033{
1034	struct gadget_info *gi = webusb_item_to_gadget_info(item);
1035	int ret;
1036	u8 b_vendor_code;
1037
1038	ret = kstrtou8(page, 0, &b_vendor_code);
1039	if (ret)
1040		return ret;
1041
1042	mutex_lock(&gi->lock);
1043	gi->b_webusb_vendor_code = b_vendor_code;
1044	mutex_unlock(&gi->lock);
1045
1046	return len;
1047}
1048
1049static ssize_t webusb_landingPage_show(struct config_item *item, char *page)
1050{
1051	return sysfs_emit(page, "%s\n", webusb_item_to_gadget_info(item)->landing_page);
1052}
1053
1054static ssize_t webusb_landingPage_store(struct config_item *item, const char *page,
1055				     size_t len)
1056{
1057	struct gadget_info *gi = webusb_item_to_gadget_info(item);
1058	unsigned int bytes_to_strip = 0;
1059	int l = len;
1060
1061	if (page[l - 1] == '\n') {
1062		--l;
1063		++bytes_to_strip;
1064	}
1065
1066	if (l > sizeof(gi->landing_page)) {
1067		pr_err("webusb: landingPage URL too long\n");
1068		return -EINVAL;
1069	}
1070
1071	// validation
1072	if (strncasecmp(page, "https://",  8) == 0)
1073		bytes_to_strip = 8;
1074	else if (strncasecmp(page, "http://", 7) == 0)
1075		bytes_to_strip = 7;
1076	else
1077		bytes_to_strip = 0;
1078
1079	if (l > U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + bytes_to_strip) {
1080		pr_err("webusb: landingPage URL %d bytes too long for given URL scheme\n",
1081			l - U8_MAX + WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH - bytes_to_strip);
1082		return -EINVAL;
1083	}
1084
1085	mutex_lock(&gi->lock);
1086	// ensure 0 bytes are set, in case the new landing page is shorter then the old one.
1087	memcpy_and_pad(gi->landing_page, sizeof(gi->landing_page), page, l, 0);
1088	mutex_unlock(&gi->lock);
1089
1090	return len;
1091}
1092
1093CONFIGFS_ATTR(webusb_, use);
1094CONFIGFS_ATTR(webusb_, bVendorCode);
1095CONFIGFS_ATTR(webusb_, bcdVersion);
1096CONFIGFS_ATTR(webusb_, landingPage);
1097
1098static struct configfs_attribute *webusb_attrs[] = {
1099	&webusb_attr_use,
1100	&webusb_attr_bcdVersion,
1101	&webusb_attr_bVendorCode,
1102	&webusb_attr_landingPage,
1103	NULL,
1104};
1105
1106static struct config_item_type webusb_type = {
1107	.ct_attrs	= webusb_attrs,
1108	.ct_owner	= THIS_MODULE,
1109};
1110
1111static inline struct gadget_info *os_desc_item_to_gadget_info(
1112		struct config_item *item)
1113{
1114	return container_of(to_config_group(item),
1115			struct gadget_info, os_desc_group);
1116}
1117
1118static ssize_t os_desc_use_show(struct config_item *item, char *page)
1119{
1120	return sprintf(page, "%d\n",
1121			os_desc_item_to_gadget_info(item)->use_os_desc);
1122}
1123
1124static ssize_t os_desc_use_store(struct config_item *item, const char *page,
1125				 size_t len)
1126{
1127	struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1128	int ret;
1129	bool use;
1130
1131	ret = kstrtobool(page, &use);
1132	if (ret)
1133		return ret;
1134
1135	mutex_lock(&gi->lock);
1136	gi->use_os_desc = use;
1137	mutex_unlock(&gi->lock);
1138
1139	return len;
1140}
1141
1142static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
1143{
1144	return sprintf(page, "0x%02x\n",
1145			os_desc_item_to_gadget_info(item)->b_vendor_code);
1146}
1147
1148static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
1149					   const char *page, size_t len)
1150{
1151	struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1152	int ret;
1153	u8 b_vendor_code;
1154
1155	ret = kstrtou8(page, 0, &b_vendor_code);
1156	if (ret)
1157		return ret;
1158
1159	mutex_lock(&gi->lock);
1160	gi->b_vendor_code = b_vendor_code;
1161	mutex_unlock(&gi->lock);
1162
1163	return len;
1164}
1165
1166static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
1167{
1168	struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1169	int res;
1170
1171	res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
1172			      UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
1173	page[res++] = '\n';
1174
1175	return res;
1176}
1177
1178static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
1179				     size_t len)
1180{
1181	struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1182	int res, l;
1183
1184	l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
1185	if (page[l - 1] == '\n')
1186		--l;
1187
1188	mutex_lock(&gi->lock);
1189	res = utf8s_to_utf16s(page, l,
1190			      UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
1191			      OS_STRING_QW_SIGN_LEN);
1192	if (res > 0)
1193		res = len;
1194	mutex_unlock(&gi->lock);
1195
1196	return res;
1197}
1198
1199CONFIGFS_ATTR(os_desc_, use);
1200CONFIGFS_ATTR(os_desc_, b_vendor_code);
1201CONFIGFS_ATTR(os_desc_, qw_sign);
1202
1203static struct configfs_attribute *os_desc_attrs[] = {
1204	&os_desc_attr_use,
1205	&os_desc_attr_b_vendor_code,
1206	&os_desc_attr_qw_sign,
1207	NULL,
1208};
1209
1210static int os_desc_link(struct config_item *os_desc_ci,
1211			struct config_item *usb_cfg_ci)
1212{
1213	struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
1214	struct usb_composite_dev *cdev = &gi->cdev;
1215	struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci);
1216	struct usb_configuration *c = NULL, *iter;
1217	int ret;
1218
1219	mutex_lock(&gi->lock);
1220	list_for_each_entry(iter, &cdev->configs, list) {
1221		if (iter != &c_target->c)
1222			continue;
1223		c = iter;
1224		break;
1225	}
1226	if (!c) {
1227		ret = -EINVAL;
1228		goto out;
1229	}
1230
1231	if (cdev->os_desc_config) {
1232		ret = -EBUSY;
1233		goto out;
1234	}
1235
1236	cdev->os_desc_config = &c_target->c;
1237	ret = 0;
1238
1239out:
1240	mutex_unlock(&gi->lock);
1241	return ret;
1242}
1243
1244static void os_desc_unlink(struct config_item *os_desc_ci,
1245			  struct config_item *usb_cfg_ci)
1246{
1247	struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
1248	struct usb_composite_dev *cdev = &gi->cdev;
1249
1250	mutex_lock(&gi->lock);
1251	if (gi->composite.gadget_driver.udc_name)
1252		unregister_gadget(gi);
1253	cdev->os_desc_config = NULL;
1254	WARN_ON(gi->composite.gadget_driver.udc_name);
1255	mutex_unlock(&gi->lock);
1256}
1257
1258static struct configfs_item_operations os_desc_ops = {
1259	.allow_link		= os_desc_link,
1260	.drop_link		= os_desc_unlink,
1261};
1262
1263static struct config_item_type os_desc_type = {
1264	.ct_item_ops	= &os_desc_ops,
1265	.ct_attrs	= os_desc_attrs,
1266	.ct_owner	= THIS_MODULE,
1267};
1268
1269static inline struct usb_os_desc_ext_prop
1270*to_usb_os_desc_ext_prop(struct config_item *item)
1271{
1272	return container_of(item, struct usb_os_desc_ext_prop, item);
1273}
1274
1275static ssize_t ext_prop_type_show(struct config_item *item, char *page)
1276{
1277	return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
1278}
1279
1280static ssize_t ext_prop_type_store(struct config_item *item,
1281				   const char *page, size_t len)
1282{
1283	struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1284	struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1285	u8 type;
1286	int ret;
1287
1288	ret = kstrtou8(page, 0, &type);
1289	if (ret)
1290		return ret;
1291
1292	if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI)
1293		return -EINVAL;
1294
1295	if (desc->opts_mutex)
1296		mutex_lock(desc->opts_mutex);
1297
1298	if ((ext_prop->type == USB_EXT_PROP_BINARY ||
1299	    ext_prop->type == USB_EXT_PROP_LE32 ||
1300	    ext_prop->type == USB_EXT_PROP_BE32) &&
1301	    (type == USB_EXT_PROP_UNICODE ||
1302	    type == USB_EXT_PROP_UNICODE_ENV ||
1303	    type == USB_EXT_PROP_UNICODE_LINK))
1304		ext_prop->data_len <<= 1;
1305	else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
1306		   ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1307		   ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
1308		   (type == USB_EXT_PROP_BINARY ||
1309		   type == USB_EXT_PROP_LE32 ||
1310		   type == USB_EXT_PROP_BE32))
1311		ext_prop->data_len >>= 1;
1312	ext_prop->type = type;
1313
1314	if (desc->opts_mutex)
1315		mutex_unlock(desc->opts_mutex);
1316	return len;
1317}
1318
1319static ssize_t ext_prop_data_show(struct config_item *item, char *page)
1320{
1321	struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1322	int len = ext_prop->data_len;
1323
1324	if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1325	    ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1326	    ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1327		len >>= 1;
1328	memcpy(page, ext_prop->data, len);
1329
1330	return len;
1331}
1332
1333static ssize_t ext_prop_data_store(struct config_item *item,
1334				   const char *page, size_t len)
1335{
1336	struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1337	struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1338	char *new_data;
1339	size_t ret_len = len;
1340
1341	if (page[len - 1] == '\n' || page[len - 1] == '\0')
1342		--len;
1343	new_data = kmemdup(page, len, GFP_KERNEL);
1344	if (!new_data)
1345		return -ENOMEM;
1346
1347	if (desc->opts_mutex)
1348		mutex_lock(desc->opts_mutex);
1349	kfree(ext_prop->data);
1350	ext_prop->data = new_data;
1351	desc->ext_prop_len -= ext_prop->data_len;
1352	ext_prop->data_len = len;
1353	desc->ext_prop_len += ext_prop->data_len;
1354	if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1355	    ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1356	    ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1357		desc->ext_prop_len -= ext_prop->data_len;
1358		ext_prop->data_len <<= 1;
1359		ext_prop->data_len += 2;
1360		desc->ext_prop_len += ext_prop->data_len;
1361	}
1362	if (desc->opts_mutex)
1363		mutex_unlock(desc->opts_mutex);
1364	return ret_len;
1365}
1366
1367CONFIGFS_ATTR(ext_prop_, type);
1368CONFIGFS_ATTR(ext_prop_, data);
1369
1370static struct configfs_attribute *ext_prop_attrs[] = {
1371	&ext_prop_attr_type,
1372	&ext_prop_attr_data,
1373	NULL,
1374};
1375
1376static void usb_os_desc_ext_prop_release(struct config_item *item)
1377{
1378	struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1379
1380	kfree(ext_prop); /* frees a whole chunk */
1381}
1382
1383static struct configfs_item_operations ext_prop_ops = {
1384	.release		= usb_os_desc_ext_prop_release,
1385};
1386
1387static struct config_item *ext_prop_make(
1388		struct config_group *group,
1389		const char *name)
1390{
1391	struct usb_os_desc_ext_prop *ext_prop;
1392	struct config_item_type *ext_prop_type;
1393	struct usb_os_desc *desc;
1394	char *vlabuf;
1395
1396	vla_group(data_chunk);
1397	vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1398	vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1399
1400	vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1401	if (!vlabuf)
1402		return ERR_PTR(-ENOMEM);
1403
1404	ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1405	ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1406
1407	desc = container_of(group, struct usb_os_desc, group);
1408	ext_prop_type->ct_item_ops = &ext_prop_ops;
1409	ext_prop_type->ct_attrs = ext_prop_attrs;
1410	ext_prop_type->ct_owner = desc->owner;
1411
1412	config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1413
1414	ext_prop->name = kstrdup(name, GFP_KERNEL);
1415	if (!ext_prop->name) {
1416		kfree(vlabuf);
1417		return ERR_PTR(-ENOMEM);
1418	}
1419	desc->ext_prop_len += 14;
1420	ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1421	if (desc->opts_mutex)
1422		mutex_lock(desc->opts_mutex);
1423	desc->ext_prop_len += ext_prop->name_len;
1424	list_add_tail(&ext_prop->entry, &desc->ext_prop);
1425	++desc->ext_prop_count;
1426	if (desc->opts_mutex)
1427		mutex_unlock(desc->opts_mutex);
1428
1429	return &ext_prop->item;
1430}
1431
1432static void ext_prop_drop(struct config_group *group, struct config_item *item)
1433{
1434	struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1435	struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1436
1437	if (desc->opts_mutex)
1438		mutex_lock(desc->opts_mutex);
1439	list_del(&ext_prop->entry);
1440	--desc->ext_prop_count;
1441	kfree(ext_prop->name);
1442	desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1443	if (desc->opts_mutex)
1444		mutex_unlock(desc->opts_mutex);
1445	config_item_put(item);
1446}
1447
1448static struct configfs_group_operations interf_grp_ops = {
1449	.make_item	= &ext_prop_make,
1450	.drop_item	= &ext_prop_drop,
1451};
1452
1453static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1454					     char *page)
1455{
1456	memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1457	return 8;
1458}
1459
1460static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1461					      const char *page, size_t len)
1462{
1463	struct usb_os_desc *desc = to_usb_os_desc(item);
1464	int l;
1465
1466	l = min_t(int, 8, len);
1467	if (page[l - 1] == '\n')
1468		--l;
1469	if (desc->opts_mutex)
1470		mutex_lock(desc->opts_mutex);
1471	memcpy(desc->ext_compat_id, page, l);
1472
1473	if (desc->opts_mutex)
1474		mutex_unlock(desc->opts_mutex);
1475
1476	return len;
1477}
1478
1479static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1480						 char *page)
1481{
1482	memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1483	return 8;
1484}
1485
1486static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1487						  const char *page, size_t len)
1488{
1489	struct usb_os_desc *desc = to_usb_os_desc(item);
1490	int l;
1491
1492	l = min_t(int, 8, len);
1493	if (page[l - 1] == '\n')
1494		--l;
1495	if (desc->opts_mutex)
1496		mutex_lock(desc->opts_mutex);
1497	memcpy(desc->ext_compat_id + 8, page, l);
1498
1499	if (desc->opts_mutex)
1500		mutex_unlock(desc->opts_mutex);
1501
1502	return len;
1503}
1504
1505CONFIGFS_ATTR(interf_grp_, compatible_id);
1506CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1507
1508static struct configfs_attribute *interf_grp_attrs[] = {
1509	&interf_grp_attr_compatible_id,
1510	&interf_grp_attr_sub_compatible_id,
1511	NULL
1512};
1513
1514struct config_group *usb_os_desc_prepare_interf_dir(
1515		struct config_group *parent,
1516		int n_interf,
1517		struct usb_os_desc **desc,
1518		char **names,
1519		struct module *owner)
1520{
1521	struct config_group *os_desc_group;
1522	struct config_item_type *os_desc_type, *interface_type;
1523
1524	vla_group(data_chunk);
1525	vla_item(data_chunk, struct config_group, os_desc_group, 1);
1526	vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1527	vla_item(data_chunk, struct config_item_type, interface_type, 1);
1528
1529	char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1530	if (!vlabuf)
1531		return ERR_PTR(-ENOMEM);
1532
1533	os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1534	os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1535	interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1536
1537	os_desc_type->ct_owner = owner;
1538	config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1539	configfs_add_default_group(os_desc_group, parent);
1540
1541	interface_type->ct_group_ops = &interf_grp_ops;
1542	interface_type->ct_attrs = interf_grp_attrs;
1543	interface_type->ct_owner = owner;
1544
1545	while (n_interf--) {
1546		struct usb_os_desc *d;
1547
1548		d = desc[n_interf];
1549		d->owner = owner;
1550		config_group_init_type_name(&d->group, "", interface_type);
1551		config_item_set_name(&d->group.cg_item, "interface.%s",
1552				     names[n_interf]);
1553		configfs_add_default_group(&d->group, os_desc_group);
1554	}
1555
1556	return os_desc_group;
1557}
1558EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1559
1560static int configfs_do_nothing(struct usb_composite_dev *cdev)
1561{
1562	WARN_ON(1);
1563	return -EINVAL;
1564}
1565
1566int composite_dev_prepare(struct usb_composite_driver *composite,
1567		struct usb_composite_dev *dev);
1568
1569int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1570				  struct usb_ep *ep0);
1571
1572static void purge_configs_funcs(struct gadget_info *gi)
1573{
1574	struct usb_configuration	*c;
1575
1576	list_for_each_entry(c, &gi->cdev.configs, list) {
1577		struct usb_function *f, *tmp;
1578		struct config_usb_cfg *cfg;
1579
1580		cfg = container_of(c, struct config_usb_cfg, c);
1581
1582		list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1583
1584			list_move(&f->list, &cfg->func_list);
1585			if (f->unbind) {
1586				dev_dbg(&gi->cdev.gadget->dev,
1587					"unbind function '%s'/%p\n",
1588					f->name, f);
1589				f->unbind(c, f);
1590			}
1591		}
1592		c->next_interface_id = 0;
1593		memset(c->interface, 0, sizeof(c->interface));
1594		c->superspeed_plus = 0;
1595		c->superspeed = 0;
1596		c->highspeed = 0;
1597		c->fullspeed = 0;
1598	}
1599}
1600
1601static struct usb_string *
1602configfs_attach_gadget_strings(struct gadget_info *gi)
1603{
1604	struct usb_gadget_strings **gadget_strings;
1605	struct gadget_language *language;
1606	struct gadget_string *string;
1607	unsigned int nlangs = 0;
1608	struct list_head *iter;
1609	struct usb_string *us;
1610	unsigned int i = 0;
1611	int nstrings = -1;
1612	unsigned int j;
1613
1614	list_for_each(iter, &gi->string_list)
1615		nlangs++;
1616
1617	/* Bail out early if no languages are configured */
1618	if (!nlangs)
1619		return NULL;
1620
1621	gadget_strings = kcalloc(nlangs + 1, /* including NULL terminator */
1622				 sizeof(struct usb_gadget_strings *), GFP_KERNEL);
1623	if (!gadget_strings)
1624		return ERR_PTR(-ENOMEM);
1625
1626	list_for_each_entry(language, &gi->string_list, list) {
1627		struct usb_string *stringtab;
1628
1629		if (nstrings == -1) {
1630			nstrings = language->nstrings;
1631		} else if (nstrings != language->nstrings) {
1632			pr_err("languages must contain the same number of strings\n");
1633			us = ERR_PTR(-EINVAL);
1634			goto cleanup;
1635		}
1636
1637		stringtab = kcalloc(language->nstrings + 1, sizeof(struct usb_string),
1638				    GFP_KERNEL);
1639		if (!stringtab) {
1640			us = ERR_PTR(-ENOMEM);
1641			goto cleanup;
1642		}
1643
1644		stringtab[USB_GADGET_MANUFACTURER_IDX].id = USB_GADGET_MANUFACTURER_IDX;
1645		stringtab[USB_GADGET_MANUFACTURER_IDX].s = language->manufacturer;
1646		stringtab[USB_GADGET_PRODUCT_IDX].id = USB_GADGET_PRODUCT_IDX;
1647		stringtab[USB_GADGET_PRODUCT_IDX].s = language->product;
1648		stringtab[USB_GADGET_SERIAL_IDX].id = USB_GADGET_SERIAL_IDX;
1649		stringtab[USB_GADGET_SERIAL_IDX].s = language->serialnumber;
1650
1651		j = USB_GADGET_FIRST_AVAIL_IDX;
1652		list_for_each_entry(string, &language->gadget_strings, list) {
1653			memcpy(&stringtab[j], &string->usb_string, sizeof(struct usb_string));
1654			j++;
1655		}
1656
1657		language->stringtab_dev.strings = stringtab;
1658		gadget_strings[i] = &language->stringtab_dev;
1659		i++;
1660	}
1661
1662	us = usb_gstrings_attach(&gi->cdev, gadget_strings, nstrings);
1663
1664cleanup:
1665	list_for_each_entry(language, &gi->string_list, list) {
1666		kfree(language->stringtab_dev.strings);
1667		language->stringtab_dev.strings = NULL;
1668	}
1669
1670	kfree(gadget_strings);
1671
1672	return us;
1673}
1674
1675static int configfs_composite_bind(struct usb_gadget *gadget,
1676		struct usb_gadget_driver *gdriver)
1677{
1678	struct usb_composite_driver     *composite = to_cdriver(gdriver);
1679	struct gadget_info		*gi = container_of(composite,
1680						struct gadget_info, composite);
1681	struct usb_composite_dev	*cdev = &gi->cdev;
1682	struct usb_configuration	*c;
1683	struct usb_string		*s;
1684	unsigned			i;
1685	int				ret;
1686
1687	/* the gi->lock is hold by the caller */
1688	gi->unbind = 0;
1689	cdev->gadget = gadget;
1690	set_gadget_data(gadget, cdev);
1691	ret = composite_dev_prepare(composite, cdev);
1692	if (ret)
1693		return ret;
1694	/* and now the gadget bind */
1695	ret = -EINVAL;
1696
1697	if (list_empty(&gi->cdev.configs)) {
1698		pr_err("Need at least one configuration in %s.\n",
1699				gi->composite.name);
1700		goto err_comp_cleanup;
1701	}
1702
1703
1704	list_for_each_entry(c, &gi->cdev.configs, list) {
1705		struct config_usb_cfg *cfg;
1706
1707		cfg = container_of(c, struct config_usb_cfg, c);
1708		if (list_empty(&cfg->func_list)) {
1709			pr_err("Config %s/%d of %s needs at least one function.\n",
1710			      c->label, c->bConfigurationValue,
1711			      gi->composite.name);
1712			goto err_comp_cleanup;
1713		}
1714	}
1715
1716	/* init all strings */
1717	if (!list_empty(&gi->string_list)) {
1718		s = configfs_attach_gadget_strings(gi);
1719		if (IS_ERR(s)) {
1720			ret = PTR_ERR(s);
1721			goto err_comp_cleanup;
1722		}
1723
1724		gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1725		gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1726		gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1727
1728		gi->cdev.usb_strings = s;
1729	}
1730
1731	if (gi->use_webusb) {
1732		cdev->use_webusb = true;
1733		cdev->bcd_webusb_version = gi->bcd_webusb_version;
1734		cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code;
1735		memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH);
1736	}
1737
1738	if (gi->use_os_desc) {
1739		cdev->use_os_string = true;
1740		cdev->b_vendor_code = gi->b_vendor_code;
1741		memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1742	}
1743
1744	if (gadget_is_otg(gadget) && !otg_desc[0]) {
1745		struct usb_descriptor_header *usb_desc;
1746
1747		usb_desc = usb_otg_descriptor_alloc(gadget);
1748		if (!usb_desc) {
1749			ret = -ENOMEM;
1750			goto err_comp_cleanup;
1751		}
1752		usb_otg_descriptor_init(gadget, usb_desc);
1753		otg_desc[0] = usb_desc;
1754		otg_desc[1] = NULL;
1755	}
1756
1757	/* Go through all configs, attach all functions */
1758	list_for_each_entry(c, &gi->cdev.configs, list) {
1759		struct config_usb_cfg *cfg;
1760		struct usb_function *f;
1761		struct usb_function *tmp;
1762		struct gadget_config_name *cn;
1763
1764		if (gadget_is_otg(gadget))
1765			c->descriptors = otg_desc;
1766
1767		/* Properly configure the bmAttributes wakeup bit */
1768		check_remote_wakeup_config(gadget, c);
1769
1770		cfg = container_of(c, struct config_usb_cfg, c);
1771		if (!list_empty(&cfg->string_list)) {
1772			i = 0;
1773			list_for_each_entry(cn, &cfg->string_list, list) {
1774				cfg->gstrings[i] = &cn->stringtab_dev;
1775				cn->stringtab_dev.strings = &cn->strings;
1776				cn->strings.s = cn->configuration;
1777				i++;
1778			}
1779			cfg->gstrings[i] = NULL;
1780			s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1781			if (IS_ERR(s)) {
1782				ret = PTR_ERR(s);
1783				goto err_comp_cleanup;
1784			}
1785			c->iConfiguration = s[0].id;
1786		}
1787
1788		list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1789			list_del(&f->list);
1790			ret = usb_add_function(c, f);
1791			if (ret) {
1792				list_add(&f->list, &cfg->func_list);
1793				goto err_purge_funcs;
1794			}
1795		}
1796		ret = usb_gadget_check_config(cdev->gadget);
1797		if (ret)
1798			goto err_purge_funcs;
1799
1800		usb_ep_autoconfig_reset(cdev->gadget);
1801	}
1802	if (cdev->use_os_string) {
1803		ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1804		if (ret)
1805			goto err_purge_funcs;
1806	}
1807
1808	usb_ep_autoconfig_reset(cdev->gadget);
1809	return 0;
1810
1811err_purge_funcs:
1812	purge_configs_funcs(gi);
1813err_comp_cleanup:
1814	composite_dev_cleanup(cdev);
1815	return ret;
1816}
1817
1818static void configfs_composite_unbind(struct usb_gadget *gadget)
1819{
1820	struct usb_composite_dev	*cdev;
1821	struct gadget_info		*gi;
1822	unsigned long flags;
1823
1824	/* the gi->lock is hold by the caller */
1825
1826	cdev = get_gadget_data(gadget);
1827	gi = container_of(cdev, struct gadget_info, cdev);
1828	spin_lock_irqsave(&gi->spinlock, flags);
1829	gi->unbind = 1;
1830	spin_unlock_irqrestore(&gi->spinlock, flags);
1831
1832	kfree(otg_desc[0]);
1833	otg_desc[0] = NULL;
1834	purge_configs_funcs(gi);
1835	composite_dev_cleanup(cdev);
1836	usb_ep_autoconfig_reset(cdev->gadget);
1837	spin_lock_irqsave(&gi->spinlock, flags);
1838	cdev->gadget = NULL;
1839	cdev->deactivations = 0;
1840	gadget->deactivated = false;
1841	set_gadget_data(gadget, NULL);
1842	spin_unlock_irqrestore(&gi->spinlock, flags);
1843}
1844
1845static int configfs_composite_setup(struct usb_gadget *gadget,
1846		const struct usb_ctrlrequest *ctrl)
1847{
1848	struct usb_composite_dev *cdev;
1849	struct gadget_info *gi;
1850	unsigned long flags;
1851	int ret;
1852
1853	cdev = get_gadget_data(gadget);
1854	if (!cdev)
1855		return 0;
1856
1857	gi = container_of(cdev, struct gadget_info, cdev);
1858	spin_lock_irqsave(&gi->spinlock, flags);
1859	cdev = get_gadget_data(gadget);
1860	if (!cdev || gi->unbind) {
1861		spin_unlock_irqrestore(&gi->spinlock, flags);
1862		return 0;
1863	}
1864
1865	ret = composite_setup(gadget, ctrl);
1866	spin_unlock_irqrestore(&gi->spinlock, flags);
1867	return ret;
1868}
1869
1870static void configfs_composite_disconnect(struct usb_gadget *gadget)
1871{
1872	struct usb_composite_dev *cdev;
1873	struct gadget_info *gi;
1874	unsigned long flags;
1875
1876	cdev = get_gadget_data(gadget);
1877	if (!cdev)
1878		return;
1879
1880	gi = container_of(cdev, struct gadget_info, cdev);
1881	spin_lock_irqsave(&gi->spinlock, flags);
1882	cdev = get_gadget_data(gadget);
1883	if (!cdev || gi->unbind) {
1884		spin_unlock_irqrestore(&gi->spinlock, flags);
1885		return;
1886	}
1887
1888	composite_disconnect(gadget);
1889	spin_unlock_irqrestore(&gi->spinlock, flags);
1890}
1891
1892static void configfs_composite_reset(struct usb_gadget *gadget)
1893{
1894	struct usb_composite_dev *cdev;
1895	struct gadget_info *gi;
1896	unsigned long flags;
1897
1898	cdev = get_gadget_data(gadget);
1899	if (!cdev)
1900		return;
1901
1902	gi = container_of(cdev, struct gadget_info, cdev);
1903	spin_lock_irqsave(&gi->spinlock, flags);
1904	cdev = get_gadget_data(gadget);
1905	if (!cdev || gi->unbind) {
1906		spin_unlock_irqrestore(&gi->spinlock, flags);
1907		return;
1908	}
1909
1910	composite_reset(gadget);
1911	spin_unlock_irqrestore(&gi->spinlock, flags);
1912}
1913
1914static void configfs_composite_suspend(struct usb_gadget *gadget)
1915{
1916	struct usb_composite_dev *cdev;
1917	struct gadget_info *gi;
1918	unsigned long flags;
1919
1920	cdev = get_gadget_data(gadget);
1921	if (!cdev)
1922		return;
1923
1924	gi = container_of(cdev, struct gadget_info, cdev);
1925	spin_lock_irqsave(&gi->spinlock, flags);
1926	cdev = get_gadget_data(gadget);
1927	if (!cdev || gi->unbind) {
1928		spin_unlock_irqrestore(&gi->spinlock, flags);
1929		return;
1930	}
1931
1932	composite_suspend(gadget);
1933	spin_unlock_irqrestore(&gi->spinlock, flags);
1934}
1935
1936static void configfs_composite_resume(struct usb_gadget *gadget)
1937{
1938	struct usb_composite_dev *cdev;
1939	struct gadget_info *gi;
1940	unsigned long flags;
1941
1942	cdev = get_gadget_data(gadget);
1943	if (!cdev)
1944		return;
1945
1946	gi = container_of(cdev, struct gadget_info, cdev);
1947	spin_lock_irqsave(&gi->spinlock, flags);
1948	cdev = get_gadget_data(gadget);
1949	if (!cdev || gi->unbind) {
1950		spin_unlock_irqrestore(&gi->spinlock, flags);
1951		return;
1952	}
1953
1954	composite_resume(gadget);
1955	spin_unlock_irqrestore(&gi->spinlock, flags);
1956}
1957
1958static const struct usb_gadget_driver configfs_driver_template = {
1959	.bind           = configfs_composite_bind,
1960	.unbind         = configfs_composite_unbind,
1961
1962	.setup          = configfs_composite_setup,
1963	.reset          = configfs_composite_reset,
1964	.disconnect     = configfs_composite_disconnect,
1965
1966	.suspend	= configfs_composite_suspend,
1967	.resume		= configfs_composite_resume,
1968
1969	.max_speed	= USB_SPEED_SUPER_PLUS,
1970	.driver = {
1971		.owner          = THIS_MODULE,
1972	},
1973	.match_existing_only = 1,
1974};
1975
1976static struct config_group *gadgets_make(
1977		struct config_group *group,
1978		const char *name)
1979{
1980	struct gadget_info *gi;
1981
1982	gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1983	if (!gi)
1984		return ERR_PTR(-ENOMEM);
1985
1986	config_group_init_type_name(&gi->group, name, &gadget_root_type);
1987
1988	config_group_init_type_name(&gi->functions_group, "functions",
1989			&functions_type);
1990	configfs_add_default_group(&gi->functions_group, &gi->group);
1991
1992	config_group_init_type_name(&gi->configs_group, "configs",
1993			&config_desc_type);
1994	configfs_add_default_group(&gi->configs_group, &gi->group);
1995
1996	config_group_init_type_name(&gi->strings_group, "strings",
1997			&gadget_language_strings_type);
1998	configfs_add_default_group(&gi->strings_group, &gi->group);
1999
2000	config_group_init_type_name(&gi->os_desc_group, "os_desc",
2001			&os_desc_type);
2002	configfs_add_default_group(&gi->os_desc_group, &gi->group);
2003
2004	config_group_init_type_name(&gi->webusb_group, "webusb",
2005			&webusb_type);
2006	configfs_add_default_group(&gi->webusb_group, &gi->group);
2007
2008	gi->composite.bind = configfs_do_nothing;
2009	gi->composite.unbind = configfs_do_nothing;
2010	gi->composite.suspend = NULL;
2011	gi->composite.resume = NULL;
2012	gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
2013
2014	spin_lock_init(&gi->spinlock);
2015	mutex_init(&gi->lock);
2016	INIT_LIST_HEAD(&gi->string_list);
2017	INIT_LIST_HEAD(&gi->available_func);
2018
2019	composite_init_dev(&gi->cdev);
2020	gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
2021	gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
2022	gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
2023
2024	gi->composite.gadget_driver = configfs_driver_template;
2025
2026	gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL,
2027							    "configfs-gadget.%s", name);
2028	if (!gi->composite.gadget_driver.driver.name)
2029		goto err;
2030
2031	gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
2032	gi->composite.name = gi->composite.gadget_driver.function;
2033
2034	if (!gi->composite.gadget_driver.function)
2035		goto out_free_driver_name;
2036
2037	return &gi->group;
2038
2039out_free_driver_name:
2040	kfree(gi->composite.gadget_driver.driver.name);
2041err:
2042	kfree(gi);
2043	return ERR_PTR(-ENOMEM);
2044}
2045
2046static void gadgets_drop(struct config_group *group, struct config_item *item)
2047{
2048	config_item_put(item);
2049}
2050
2051static struct configfs_group_operations gadgets_ops = {
2052	.make_group     = &gadgets_make,
2053	.drop_item      = &gadgets_drop,
2054};
2055
2056static const struct config_item_type gadgets_type = {
2057	.ct_group_ops   = &gadgets_ops,
2058	.ct_owner       = THIS_MODULE,
2059};
2060
2061static struct configfs_subsystem gadget_subsys = {
2062	.su_group = {
2063		.cg_item = {
2064			.ci_namebuf = "usb_gadget",
2065			.ci_type = &gadgets_type,
2066		},
2067	},
2068	.su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
2069};
2070
2071void unregister_gadget_item(struct config_item *item)
2072{
2073	struct gadget_info *gi = to_gadget_info(item);
2074
2075	mutex_lock(&gi->lock);
2076	unregister_gadget(gi);
2077	mutex_unlock(&gi->lock);
2078}
2079EXPORT_SYMBOL_GPL(unregister_gadget_item);
2080
2081static int __init gadget_cfs_init(void)
2082{
2083	int ret;
2084
2085	config_group_init(&gadget_subsys.su_group);
2086
2087	ret = configfs_register_subsystem(&gadget_subsys);
2088	return ret;
2089}
2090module_init(gadget_cfs_init);
2091
2092static void __exit gadget_cfs_exit(void)
2093{
2094	configfs_unregister_subsystem(&gadget_subsys);
2095}
2096module_exit(gadget_cfs_exit);