drivers/usb/gadget/configfs.c

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