drivers/usb/gadget/configfs.c

   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
  15 int 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
  35 static const struct usb_descriptor_header *otg_desc[2];
  36
  37 struct 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
  64 static 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
  69 struct 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
  78 static 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
  84 static 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
  89 struct 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
 102 struct 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
 113 static 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)      \
 137 static 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)     \
 145 static 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)               \
 154 static 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)      \
 167 static 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
 183 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
 184 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
 185 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
 186 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
 187 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
 188 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
 189 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
 190 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
 191
 192 static 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
 205 static 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
 222 static 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
 239 static 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
 253 static 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
 268 static 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;
 305 err:
 306         kfree(name);
 307         mutex_unlock(&gi->lock);
 308         return ret;
 309 }
 310
 311 static 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
 319 static 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;
 347 err:
 348         mutex_unlock(&gi->lock);
 349         return -EINVAL;
 350 }
 351
 352 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
 353 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
 354 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
 355 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
 356 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
 357 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
 358 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
 359 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
 360 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
 361 CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
 362
 363 static 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
 377 static 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
 383 static 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
 390 static 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
 397 static 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
 409 static struct configfs_item_operations gadget_root_item_ops = {
 410         .release                = gadget_info_attr_release,
 411 };
 412
 413 static 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
 423 static 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;
 475 out:
 476         mutex_unlock(&gi->lock);
 477         return ret;
 478 }
 479
 480 static 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
 514 static 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
 521 static 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
 529 static 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
 544 static 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
 552 static 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
 570 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
 571 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
 572
 573 static struct configfs_attribute *gadget_config_attrs[] = {
 574         &gadget_config_desc_attr_MaxPower,
 575         &gadget_config_desc_attr_bmAttributes,
 576         NULL,
 577 };
 578
 579 static 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
 585 static 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
 591 static 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
 598 static 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
 648 static 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
 663 static struct configfs_group_operations functions_ops = {
 664         .make_group     = &function_make,
 665         .drop_item      = &function_drop,
 666 };
 667
 668 static const struct config_item_type functions_type = {
 669         .ct_group_ops   = &functions_ops,
 670         .ct_owner       = THIS_MODULE,
 671 };
 672
 673 GS_STRINGS_RW(gadget_config_name, configuration);
 674
 675 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
 676         &gadget_config_name_attr_configuration,
 677         NULL,
 678 };
 679
 680 static 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
 690 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
 691 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
 692
 693 static 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;
 753 err:
 754         kfree(cfg->c.label);
 755         kfree(cfg);
 756         return ERR_PTR(ret);
 757 }
 758
 759 static void config_desc_drop(
 760                 struct config_group *group,
 761                 struct config_item *item)
 762 {
 763         config_item_put(item);
 764 }
 765
 766 static struct configfs_group_operations config_desc_ops = {
 767         .make_group     = &config_desc_make,
 768         .drop_item      = &config_desc_drop,
 769 };
 770
 771 static const struct config_item_type config_desc_type = {
 772         .ct_group_ops   = &config_desc_ops,
 773         .ct_owner       = THIS_MODULE,
 774 };
 775
 776 GS_STRINGS_RW(gadget_language, manufacturer);
 777 GS_STRINGS_RW(gadget_language, product);
 778 GS_STRINGS_RW(gadget_language, serialnumber);
 779
 780 static 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
 787 static 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
 799 static struct configfs_item_operations gadget_language_langid_item_ops = {
 800         .release                = gadget_language_attr_release,
 801 };
 802
 803 static 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 }
 811 CONFIGFS_ATTR_RO(gadget_string_, id);
 812
 813 static 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
 822 static 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 }
 833 CONFIGFS_ATTR(gadget_string_, s);
 834
 835 static struct configfs_attribute *gadget_string_attrs[] = {
 836         &gadget_string_attr_id,
 837         &gadget_string_attr_s,
 838         NULL,
 839 };
 840
 841 static void gadget_string_release(struct config_item *item)
 842 {
 843         struct gadget_string *string = to_gadget_string(item);
 844
 845         kfree(string);
 846 }
 847
 848 static struct configfs_item_operations gadget_string_item_ops = {
 849         .release        = gadget_string_release,
 850 };
 851
 852 static 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
 858 static 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
 879 static 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
 897 static 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
 902 static 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
 909 static 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;
 945 err:
 946         kfree(new);
 947         return ERR_PTR(ret);
 948 }
 949
 950 static void gadget_language_drop(struct config_group *group,
 951                                  struct config_item *item)
 952 {
 953         config_item_put(item);
 954 }
 955
 956 static struct configfs_group_operations gadget_language_group_ops = {
 957         .make_group     = &gadget_language_make,
 958         .drop_item      = &gadget_language_drop,
 959 };
 960
 961 static struct config_item_type gadget_language_strings_type = {
 962         .ct_group_ops   = &gadget_language_group_ops,
 963         .ct_owner       = THIS_MODULE,
 964 };
 965
 966 static 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
 973 static 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
 979 static 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
 997 static 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
1003 static 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
1025 static 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
1031 static 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
1049 static 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
1054 static 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
1093 CONFIGFS_ATTR(webusb_, use);
1094 CONFIGFS_ATTR(webusb_, bVendorCode);
1095 CONFIGFS_ATTR(webusb_, bcdVersion);
1096 CONFIGFS_ATTR(webusb_, landingPage);
1097
1098 static 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
1106 static struct config_item_type webusb_type = {
1107         .ct_attrs       = webusb_attrs,
1108         .ct_owner       = THIS_MODULE,
1109 };
1110
1111 static 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
1118 static 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
1124 static 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
1142 static 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
1148 static 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
1166 static 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
1178 static 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
1199 CONFIGFS_ATTR(os_desc_, use);
1200 CONFIGFS_ATTR(os_desc_, b_vendor_code);
1201 CONFIGFS_ATTR(os_desc_, qw_sign);
1202
1203 static 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
1210 static 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
1239 out:
1240         mutex_unlock(&gi->lock);
1241         return ret;
1242 }
1243
1244 static 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
1258 static struct configfs_item_operations os_desc_ops = {
1259         .allow_link             = os_desc_link,
1260         .drop_link              = os_desc_unlink,
1261 };
1262
1263 static 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
1269 static 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
1275 static 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
1280 static 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
1319 static 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
1333 static 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
1367 CONFIGFS_ATTR(ext_prop_, type);
1368 CONFIGFS_ATTR(ext_prop_, data);
1369
1370 static struct configfs_attribute *ext_prop_attrs[] = {
1371         &ext_prop_attr_type,
1372         &ext_prop_attr_data,
1373         NULL,
1374 };
1375
1376 static 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
1383 static struct configfs_item_operations ext_prop_ops = {
1384         .release                = usb_os_desc_ext_prop_release,
1385 };
1386
1387 static 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
1432 static 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
1448 static struct configfs_group_operations interf_grp_ops = {
1449         .make_item      = &ext_prop_make,
1450         .drop_item      = &ext_prop_drop,
1451 };
1452
1453 static 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
1460 static 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
1479 static 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
1486 static 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
1505 CONFIGFS_ATTR(interf_grp_, compatible_id);
1506 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1507
1508 static struct configfs_attribute *interf_grp_attrs[] = {
1509         &interf_grp_attr_compatible_id,
1510         &interf_grp_attr_sub_compatible_id,
1511         NULL
1512 };
1513
1514 struct 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 }
1558 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1559
1560 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1561 {
1562         WARN_ON(1);
1563         return -EINVAL;
1564 }
1565
1566 int composite_dev_prepare(struct usb_composite_driver *composite,
1567                 struct usb_composite_dev *dev);
1568
1569 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1570                                   struct usb_ep *ep0);
1571
1572 static 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
1601 static struct usb_string *
1602 configfs_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
1664 cleanup:
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
1675 static 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
1811 err_purge_funcs:
1812         purge_configs_funcs(gi);
1813 err_comp_cleanup:
1814         composite_dev_cleanup(cdev);
1815         return ret;
1816 }
1817
1818 static 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
1845 static 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
1870 static 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
1892 static 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
1914 static 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
1936 static 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
1958 static 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
1976 static 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
2039 out_free_driver_name:
2040         kfree(gi->composite.gadget_driver.driver.name);
2041 err:
2042         kfree(gi);
2043         return ERR_PTR(-ENOMEM);
2044 }
2045
2046 static void gadgets_drop(struct config_group *group, struct config_item *item)
2047 {
2048         config_item_put(item);
2049 }
2050
2051 static struct configfs_group_operations gadgets_ops = {
2052         .make_group     = &gadgets_make,
2053         .drop_item      = &gadgets_drop,
2054 };
2055
2056 static const struct config_item_type gadgets_type = {
2057         .ct_group_ops   = &gadgets_ops,
2058         .ct_owner       = THIS_MODULE,
2059 };
2060
2061 static 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
2071 void 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 }
2079 EXPORT_SYMBOL_GPL(unregister_gadget_item);
2080
2081 static 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 }
2090 module_init(gadget_cfs_init);
2091
2092 static void __exit gadget_cfs_exit(void)
2093 {
2094         configfs_unregister_subsystem(&gadget_subsys);
2095 }
2096 module_exit(gadget_cfs_exit);