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 struct gadget_info {
  45         struct config_group group;
  46         struct config_group functions_group;
  47         struct config_group configs_group;
  48         struct config_group strings_group;
  49         struct config_group os_desc_group;
  50         struct config_group *default_groups[5];
  51
  52         struct mutex lock;
  53         struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
  54         struct list_head string_list;
  55         struct list_head available_func;
  56
  57         const char *udc_name;
  58 #ifdef CONFIG_USB_OTG
  59         struct usb_otg_descriptor otg;
  60 #endif
  61         struct usb_composite_driver composite;
  62         struct usb_composite_dev cdev;
  63         bool use_os_desc;
  64         char b_vendor_code;
  65         char qw_sign[OS_STRING_QW_SIGN_LEN];
  66 };
  67
  68 struct config_usb_cfg {
  69         struct config_group group;
  70         struct config_group strings_group;
  71         struct config_group *default_groups[2];
  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 struct gadget_strings {
  79         struct usb_gadget_strings stringtab_dev;
  80         struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
  81         char *manufacturer;
  82         char *product;
  83         char *serialnumber;
  84
  85         struct config_group group;
  86         struct list_head list;
  87 };
  88
  89 struct os_desc {
  90         struct config_group group;
  91 };
  92
  93 struct gadget_config_name {
  94         struct usb_gadget_strings stringtab_dev;
  95         struct usb_string strings;
  96         char *configuration;
  97
  98         struct config_group group;
  99         struct list_head list;
 100 };
 101
 102 static int usb_string_copy(const char *s, char **s_copy)
 103 {
 104         int ret;
 105         char *str;
 106         char *copy = *s_copy;
 107         ret = strlen(s);
 108         if (ret > 126)
 109                 return -EOVERFLOW;
 110
 111         str = kstrdup(s, GFP_KERNEL);
 112         if (!str)
 113                 return -ENOMEM;
 114         if (str[ret - 1] == '\n')
 115                 str[ret - 1] = '\0';
 116         kfree(copy);
 117         *s_copy = str;
 118         return 0;
 119 }
 120
 121 CONFIGFS_ATTR_STRUCT(gadget_info);
 122 CONFIGFS_ATTR_STRUCT(config_usb_cfg);
 123
 124 #define GI_DEVICE_DESC_ITEM_ATTR(name)  \
 125         static struct gadget_info_attribute gadget_cdev_desc_##name = \
 126                 __CONFIGFS_ATTR(name,  S_IRUGO | S_IWUSR,               \
 127                                 gadget_dev_desc_##name##_show,          \
 128                                 gadget_dev_desc_##name##_store)
 129
 130 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name)      \
 131         static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \
 132                         char *page)     \
 133 {       \
 134         return sprintf(page, "0x%02x\n", gi->cdev.desc.__name); \
 135 }
 136
 137 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name)     \
 138         static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \
 139                         char *page)     \
 140 {       \
 141         return sprintf(page, "0x%04x\n", le16_to_cpup(&gi->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 gadget_info *gi, \
 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         gi->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 gadget_info *gi, \
 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         gi->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 gadget_info *gi,
 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         gi->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
 211         return len;
 212 }
 213
 214 static ssize_t gadget_dev_desc_bcdUSB_store(struct gadget_info *gi,
 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         gi->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
 228         return len;
 229 }
 230
 231 static ssize_t gadget_dev_desc_UDC_show(struct gadget_info *gi, char *page)
 232 {
 233         return sprintf(page, "%s\n", gi->udc_name ?: "");
 234 }
 235
 236 static int unregister_gadget(struct gadget_info *gi)
 237 {
 238         int ret;
 239
 240         if (!gi->udc_name)
 241                 return -ENODEV;
 242
 243         ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
 244         if (ret)
 245                 return ret;
 246         kfree(gi->udc_name);
 247         gi->udc_name = NULL;
 248         return 0;
 249 }
 250
 251 static ssize_t gadget_dev_desc_UDC_store(struct gadget_info *gi,
 252                 const char *page, size_t len)
 253 {
 254         char *name;
 255         int ret;
 256
 257         name = kstrdup(page, GFP_KERNEL);
 258         if (!name)
 259                 return -ENOMEM;
 260         if (name[len - 1] == '\n')
 261                 name[len - 1] = '\0';
 262
 263         mutex_lock(&gi->lock);
 264
 265         if (!strlen(name)) {
 266                 ret = unregister_gadget(gi);
 267                 if (ret)
 268                         goto err;
 269         } else {
 270                 if (gi->udc_name) {
 271                         ret = -EBUSY;
 272                         goto err;
 273                 }
 274                 ret = usb_udc_attach_driver(name, &gi->composite.gadget_driver);
 275                 if (ret)
 276                         goto err;
 277                 gi->udc_name = name;
 278         }
 279         mutex_unlock(&gi->lock);
 280         return len;
 281 err:
 282         kfree(name);
 283         mutex_unlock(&gi->lock);
 284         return ret;
 285 }
 286
 287 GI_DEVICE_DESC_ITEM_ATTR(bDeviceClass);
 288 GI_DEVICE_DESC_ITEM_ATTR(bDeviceSubClass);
 289 GI_DEVICE_DESC_ITEM_ATTR(bDeviceProtocol);
 290 GI_DEVICE_DESC_ITEM_ATTR(bMaxPacketSize0);
 291 GI_DEVICE_DESC_ITEM_ATTR(idVendor);
 292 GI_DEVICE_DESC_ITEM_ATTR(idProduct);
 293 GI_DEVICE_DESC_ITEM_ATTR(bcdDevice);
 294 GI_DEVICE_DESC_ITEM_ATTR(bcdUSB);
 295 GI_DEVICE_DESC_ITEM_ATTR(UDC);
 296
 297 static struct configfs_attribute *gadget_root_attrs[] = {
 298         &gadget_cdev_desc_bDeviceClass.attr,
 299         &gadget_cdev_desc_bDeviceSubClass.attr,
 300         &gadget_cdev_desc_bDeviceProtocol.attr,
 301         &gadget_cdev_desc_bMaxPacketSize0.attr,
 302         &gadget_cdev_desc_idVendor.attr,
 303         &gadget_cdev_desc_idProduct.attr,
 304         &gadget_cdev_desc_bcdDevice.attr,
 305         &gadget_cdev_desc_bcdUSB.attr,
 306         &gadget_cdev_desc_UDC.attr,
 307         NULL,
 308 };
 309
 310 static inline struct gadget_info *to_gadget_info(struct config_item *item)
 311 {
 312          return container_of(to_config_group(item), struct gadget_info, group);
 313 }
 314
 315 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
 316 {
 317          return container_of(to_config_group(item), struct gadget_strings,
 318                          group);
 319 }
 320
 321 static inline struct gadget_config_name *to_gadget_config_name(
 322                 struct config_item *item)
 323 {
 324          return container_of(to_config_group(item), struct gadget_config_name,
 325                          group);
 326 }
 327
 328 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
 329 {
 330         return container_of(to_config_group(item), struct config_usb_cfg,
 331                         group);
 332 }
 333
 334 static inline struct usb_function_instance *to_usb_function_instance(
 335                 struct config_item *item)
 336 {
 337          return container_of(to_config_group(item),
 338                          struct usb_function_instance, group);
 339 }
 340
 341 static void gadget_info_attr_release(struct config_item *item)
 342 {
 343         struct gadget_info *gi = to_gadget_info(item);
 344
 345         WARN_ON(!list_empty(&gi->cdev.configs));
 346         WARN_ON(!list_empty(&gi->string_list));
 347         WARN_ON(!list_empty(&gi->available_func));
 348         kfree(gi->composite.gadget_driver.function);
 349         kfree(gi);
 350 }
 351
 352 CONFIGFS_ATTR_OPS(gadget_info);
 353
 354 static struct configfs_item_operations gadget_root_item_ops = {
 355         .release                = gadget_info_attr_release,
 356         .show_attribute         = gadget_info_attr_show,
 357         .store_attribute        = gadget_info_attr_store,
 358 };
 359
 360 static void gadget_config_attr_release(struct config_item *item)
 361 {
 362         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 363
 364         WARN_ON(!list_empty(&cfg->c.functions));
 365         list_del(&cfg->c.list);
 366         kfree(cfg->c.label);
 367         kfree(cfg);
 368 }
 369
 370 static int config_usb_cfg_link(
 371         struct config_item *usb_cfg_ci,
 372         struct config_item *usb_func_ci)
 373 {
 374         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 375         struct usb_composite_dev *cdev = cfg->c.cdev;
 376         struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
 377
 378         struct config_group *group = to_config_group(usb_func_ci);
 379         struct usb_function_instance *fi = container_of(group,
 380                         struct usb_function_instance, group);
 381         struct usb_function_instance *a_fi;
 382         struct usb_function *f;
 383         int ret;
 384
 385         mutex_lock(&gi->lock);
 386         /*
 387          * Make sure this function is from within our _this_ gadget and not
 388          * from another gadget or a random directory.
 389          * Also a function instance can only be linked once.
 390          */
 391         list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
 392                 if (a_fi == fi)
 393                         break;
 394         }
 395         if (a_fi != fi) {
 396                 ret = -EINVAL;
 397                 goto out;
 398         }
 399
 400         list_for_each_entry(f, &cfg->func_list, list) {
 401                 if (f->fi == fi) {
 402                         ret = -EEXIST;
 403                         goto out;
 404                 }
 405         }
 406
 407         f = usb_get_function(fi);
 408         if (IS_ERR(f)) {
 409                 ret = PTR_ERR(f);
 410                 goto out;
 411         }
 412
 413         /* stash the function until we bind it to the gadget */
 414         list_add_tail(&f->list, &cfg->func_list);
 415         ret = 0;
 416 out:
 417         mutex_unlock(&gi->lock);
 418         return ret;
 419 }
 420
 421 static int config_usb_cfg_unlink(
 422         struct config_item *usb_cfg_ci,
 423         struct config_item *usb_func_ci)
 424 {
 425         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 426         struct usb_composite_dev *cdev = cfg->c.cdev;
 427         struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
 428
 429         struct config_group *group = to_config_group(usb_func_ci);
 430         struct usb_function_instance *fi = container_of(group,
 431                         struct usb_function_instance, group);
 432         struct usb_function *f;
 433
 434         /*
 435          * ideally I would like to forbid to unlink functions while a gadget is
 436          * bound to an UDC. Since this isn't possible at the moment, we simply
 437          * force an unbind, the function is available here and then we can
 438          * remove the function.
 439          */
 440         mutex_lock(&gi->lock);
 441         if (gi->udc_name)
 442                 unregister_gadget(gi);
 443         WARN_ON(gi->udc_name);
 444
 445         list_for_each_entry(f, &cfg->func_list, list) {
 446                 if (f->fi == fi) {
 447                         list_del(&f->list);
 448                         usb_put_function(f);
 449                         mutex_unlock(&gi->lock);
 450                         return 0;
 451                 }
 452         }
 453         mutex_unlock(&gi->lock);
 454         WARN(1, "Unable to locate function to unbind\n");
 455         return 0;
 456 }
 457
 458 CONFIGFS_ATTR_OPS(config_usb_cfg);
 459
 460 static struct configfs_item_operations gadget_config_item_ops = {
 461         .release                = gadget_config_attr_release,
 462         .show_attribute         = config_usb_cfg_attr_show,
 463         .store_attribute        = config_usb_cfg_attr_store,
 464         .allow_link             = config_usb_cfg_link,
 465         .drop_link              = config_usb_cfg_unlink,
 466 };
 467
 468
 469 static ssize_t gadget_config_desc_MaxPower_show(struct config_usb_cfg *cfg,
 470                 char *page)
 471 {
 472         return sprintf(page, "%u\n", cfg->c.MaxPower);
 473 }
 474
 475 static ssize_t gadget_config_desc_MaxPower_store(struct config_usb_cfg *cfg,
 476                 const char *page, size_t len)
 477 {
 478         u16 val;
 479         int ret;
 480         ret = kstrtou16(page, 0, &val);
 481         if (ret)
 482                 return ret;
 483         if (DIV_ROUND_UP(val, 8) > 0xff)
 484                 return -ERANGE;
 485         cfg->c.MaxPower = val;
 486         return len;
 487 }
 488
 489 static ssize_t gadget_config_desc_bmAttributes_show(struct config_usb_cfg *cfg,
 490                 char *page)
 491 {
 492         return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
 493 }
 494
 495 static ssize_t gadget_config_desc_bmAttributes_store(struct config_usb_cfg *cfg,
 496                 const char *page, size_t len)
 497 {
 498         u8 val;
 499         int ret;
 500         ret = kstrtou8(page, 0, &val);
 501         if (ret)
 502                 return ret;
 503         if (!(val & USB_CONFIG_ATT_ONE))
 504                 return -EINVAL;
 505         if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
 506                                 USB_CONFIG_ATT_WAKEUP))
 507                 return -EINVAL;
 508         cfg->c.bmAttributes = val;
 509         return len;
 510 }
 511
 512 #define CFG_CONFIG_DESC_ITEM_ATTR(name) \
 513         static struct config_usb_cfg_attribute gadget_usb_cfg_##name = \
 514                 __CONFIGFS_ATTR(name,  S_IRUGO | S_IWUSR,               \
 515                                 gadget_config_desc_##name##_show,       \
 516                                 gadget_config_desc_##name##_store)
 517
 518 CFG_CONFIG_DESC_ITEM_ATTR(MaxPower);
 519 CFG_CONFIG_DESC_ITEM_ATTR(bmAttributes);
 520
 521 static struct configfs_attribute *gadget_config_attrs[] = {
 522         &gadget_usb_cfg_MaxPower.attr,
 523         &gadget_usb_cfg_bmAttributes.attr,
 524         NULL,
 525 };
 526
 527 static struct config_item_type gadget_config_type = {
 528         .ct_item_ops    = &gadget_config_item_ops,
 529         .ct_attrs       = gadget_config_attrs,
 530         .ct_owner       = THIS_MODULE,
 531 };
 532
 533 static struct config_item_type gadget_root_type = {
 534         .ct_item_ops    = &gadget_root_item_ops,
 535         .ct_attrs       = gadget_root_attrs,
 536         .ct_owner       = THIS_MODULE,
 537 };
 538
 539 static void composite_init_dev(struct usb_composite_dev *cdev)
 540 {
 541         spin_lock_init(&cdev->lock);
 542         INIT_LIST_HEAD(&cdev->configs);
 543         INIT_LIST_HEAD(&cdev->gstrings);
 544 }
 545
 546 static struct config_group *function_make(
 547                 struct config_group *group,
 548                 const char *name)
 549 {
 550         struct gadget_info *gi;
 551         struct usb_function_instance *fi;
 552         char buf[MAX_NAME_LEN];
 553         char *func_name;
 554         char *instance_name;
 555         int ret;
 556
 557         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
 558         if (ret >= MAX_NAME_LEN)
 559                 return ERR_PTR(-ENAMETOOLONG);
 560
 561         func_name = buf;
 562         instance_name = strchr(func_name, '.');
 563         if (!instance_name) {
 564                 pr_err("Unable to locate . in FUNC.INSTANCE\n");
 565                 return ERR_PTR(-EINVAL);
 566         }
 567         *instance_name = '\0';
 568         instance_name++;
 569
 570         fi = usb_get_function_instance(func_name);
 571         if (IS_ERR(fi))
 572                 return ERR_CAST(fi);
 573
 574         ret = config_item_set_name(&fi->group.cg_item, name);
 575         if (ret) {
 576                 usb_put_function_instance(fi);
 577                 return ERR_PTR(ret);
 578         }
 579         if (fi->set_inst_name) {
 580                 ret = fi->set_inst_name(fi, instance_name);
 581                 if (ret) {
 582                         usb_put_function_instance(fi);
 583                         return ERR_PTR(ret);
 584                 }
 585         }
 586
 587         gi = container_of(group, struct gadget_info, functions_group);
 588
 589         mutex_lock(&gi->lock);
 590         list_add_tail(&fi->cfs_list, &gi->available_func);
 591         mutex_unlock(&gi->lock);
 592         return &fi->group;
 593 }
 594
 595 static void function_drop(
 596                 struct config_group *group,
 597                 struct config_item *item)
 598 {
 599         struct usb_function_instance *fi = to_usb_function_instance(item);
 600         struct gadget_info *gi;
 601
 602         gi = container_of(group, struct gadget_info, functions_group);
 603
 604         mutex_lock(&gi->lock);
 605         list_del(&fi->cfs_list);
 606         mutex_unlock(&gi->lock);
 607         config_item_put(item);
 608 }
 609
 610 static struct configfs_group_operations functions_ops = {
 611         .make_group     = &function_make,
 612         .drop_item      = &function_drop,
 613 };
 614
 615 static struct config_item_type functions_type = {
 616         .ct_group_ops   = &functions_ops,
 617         .ct_owner       = THIS_MODULE,
 618 };
 619
 620 CONFIGFS_ATTR_STRUCT(gadget_config_name);
 621 GS_STRINGS_RW(gadget_config_name, configuration);
 622
 623 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
 624         &gadget_config_name_configuration.attr,
 625         NULL,
 626 };
 627
 628 static void gadget_config_name_attr_release(struct config_item *item)
 629 {
 630         struct gadget_config_name *cn = to_gadget_config_name(item);
 631
 632         kfree(cn->configuration);
 633
 634         list_del(&cn->list);
 635         kfree(cn);
 636 }
 637
 638 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
 639 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
 640
 641 static struct config_group *config_desc_make(
 642                 struct config_group *group,
 643                 const char *name)
 644 {
 645         struct gadget_info *gi;
 646         struct config_usb_cfg *cfg;
 647         char buf[MAX_NAME_LEN];
 648         char *num_str;
 649         u8 num;
 650         int ret;
 651
 652         gi = container_of(group, struct gadget_info, configs_group);
 653         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
 654         if (ret >= MAX_NAME_LEN)
 655                 return ERR_PTR(-ENAMETOOLONG);
 656
 657         num_str = strchr(buf, '.');
 658         if (!num_str) {
 659                 pr_err("Unable to locate . in name.bConfigurationValue\n");
 660                 return ERR_PTR(-EINVAL);
 661         }
 662
 663         *num_str = '\0';
 664         num_str++;
 665
 666         if (!strlen(buf))
 667                 return ERR_PTR(-EINVAL);
 668
 669         ret = kstrtou8(num_str, 0, &num);
 670         if (ret)
 671                 return ERR_PTR(ret);
 672
 673         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 674         if (!cfg)
 675                 return ERR_PTR(-ENOMEM);
 676         cfg->c.label = kstrdup(buf, GFP_KERNEL);
 677         if (!cfg->c.label) {
 678                 ret = -ENOMEM;
 679                 goto err;
 680         }
 681         cfg->c.bConfigurationValue = num;
 682         cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
 683         cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
 684         INIT_LIST_HEAD(&cfg->string_list);
 685         INIT_LIST_HEAD(&cfg->func_list);
 686
 687         cfg->group.default_groups = cfg->default_groups;
 688         cfg->default_groups[0] = &cfg->strings_group;
 689
 690         config_group_init_type_name(&cfg->group, name,
 691                                 &gadget_config_type);
 692         config_group_init_type_name(&cfg->strings_group, "strings",
 693                         &gadget_config_name_strings_type);
 694
 695         ret = usb_add_config_only(&gi->cdev, &cfg->c);
 696         if (ret)
 697                 goto err;
 698
 699         return &cfg->group;
 700 err:
 701         kfree(cfg->c.label);
 702         kfree(cfg);
 703         return ERR_PTR(ret);
 704 }
 705
 706 static void config_desc_drop(
 707                 struct config_group *group,
 708                 struct config_item *item)
 709 {
 710         config_item_put(item);
 711 }
 712
 713 static struct configfs_group_operations config_desc_ops = {
 714         .make_group     = &config_desc_make,
 715         .drop_item      = &config_desc_drop,
 716 };
 717
 718 static struct config_item_type config_desc_type = {
 719         .ct_group_ops   = &config_desc_ops,
 720         .ct_owner       = THIS_MODULE,
 721 };
 722
 723 CONFIGFS_ATTR_STRUCT(gadget_strings);
 724 GS_STRINGS_RW(gadget_strings, manufacturer);
 725 GS_STRINGS_RW(gadget_strings, product);
 726 GS_STRINGS_RW(gadget_strings, serialnumber);
 727
 728 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
 729         &gadget_strings_manufacturer.attr,
 730         &gadget_strings_product.attr,
 731         &gadget_strings_serialnumber.attr,
 732         NULL,
 733 };
 734
 735 static void gadget_strings_attr_release(struct config_item *item)
 736 {
 737         struct gadget_strings *gs = to_gadget_strings(item);
 738
 739         kfree(gs->manufacturer);
 740         kfree(gs->product);
 741         kfree(gs->serialnumber);
 742
 743         list_del(&gs->list);
 744         kfree(gs);
 745 }
 746
 747 USB_CONFIG_STRING_RW_OPS(gadget_strings);
 748 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
 749
 750 static inline struct os_desc *to_os_desc(struct config_item *item)
 751 {
 752         return container_of(to_config_group(item), struct os_desc, group);
 753 }
 754
 755 CONFIGFS_ATTR_STRUCT(os_desc);
 756 CONFIGFS_ATTR_OPS(os_desc);
 757
 758 static ssize_t os_desc_use_show(struct os_desc *os_desc, char *page)
 759 {
 760         struct gadget_info *gi;
 761
 762         gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
 763
 764         return sprintf(page, "%d", gi->use_os_desc);
 765 }
 766
 767 static ssize_t os_desc_use_store(struct os_desc *os_desc, const char *page,
 768                                  size_t len)
 769 {
 770         struct gadget_info *gi;
 771         int ret;
 772         bool use;
 773
 774         gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
 775
 776         mutex_lock(&gi->lock);
 777         ret = strtobool(page, &use);
 778         if (!ret) {
 779                 gi->use_os_desc = use;
 780                 ret = len;
 781         }
 782         mutex_unlock(&gi->lock);
 783
 784         return ret;
 785 }
 786
 787 static struct os_desc_attribute os_desc_use =
 788         __CONFIGFS_ATTR(use, S_IRUGO | S_IWUSR,
 789                         os_desc_use_show,
 790                         os_desc_use_store);
 791
 792 static ssize_t os_desc_b_vendor_code_show(struct os_desc *os_desc, char *page)
 793 {
 794         struct gadget_info *gi;
 795
 796         gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
 797
 798         return sprintf(page, "%d", gi->b_vendor_code);
 799 }
 800
 801 static ssize_t os_desc_b_vendor_code_store(struct os_desc *os_desc,
 802                                            const char *page, size_t len)
 803 {
 804         struct gadget_info *gi;
 805         int ret;
 806         u8 b_vendor_code;
 807
 808         gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
 809
 810         mutex_lock(&gi->lock);
 811         ret = kstrtou8(page, 0, &b_vendor_code);
 812         if (!ret) {
 813                 gi->b_vendor_code = b_vendor_code;
 814                 ret = len;
 815         }
 816         mutex_unlock(&gi->lock);
 817
 818         return ret;
 819 }
 820
 821 static struct os_desc_attribute os_desc_b_vendor_code =
 822         __CONFIGFS_ATTR(b_vendor_code, S_IRUGO | S_IWUSR,
 823                         os_desc_b_vendor_code_show,
 824                         os_desc_b_vendor_code_store);
 825
 826 static ssize_t os_desc_qw_sign_show(struct os_desc *os_desc, char *page)
 827 {
 828         struct gadget_info *gi;
 829
 830         gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
 831
 832         memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
 833
 834         return OS_STRING_QW_SIGN_LEN;
 835 }
 836
 837 static ssize_t os_desc_qw_sign_store(struct os_desc *os_desc, const char *page,
 838                                      size_t len)
 839 {
 840         struct gadget_info *gi;
 841         int res, l;
 842
 843         gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
 844         l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
 845         if (page[l - 1] == '\n')
 846                 --l;
 847
 848         mutex_lock(&gi->lock);
 849         res = utf8s_to_utf16s(page, l,
 850                               UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
 851                               OS_STRING_QW_SIGN_LEN);
 852         if (res > 0)
 853                 res = len;
 854         mutex_unlock(&gi->lock);
 855
 856         return res;
 857 }
 858
 859 static struct os_desc_attribute os_desc_qw_sign =
 860         __CONFIGFS_ATTR(qw_sign, S_IRUGO | S_IWUSR,
 861                         os_desc_qw_sign_show,
 862                         os_desc_qw_sign_store);
 863
 864 static struct configfs_attribute *os_desc_attrs[] = {
 865         &os_desc_use.attr,
 866         &os_desc_b_vendor_code.attr,
 867         &os_desc_qw_sign.attr,
 868         NULL,
 869 };
 870
 871 static void os_desc_attr_release(struct config_item *item)
 872 {
 873         struct os_desc *os_desc = to_os_desc(item);
 874         kfree(os_desc);
 875 }
 876
 877 static int os_desc_link(struct config_item *os_desc_ci,
 878                         struct config_item *usb_cfg_ci)
 879 {
 880         struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
 881                                         struct gadget_info, os_desc_group);
 882         struct usb_composite_dev *cdev = &gi->cdev;
 883         struct config_usb_cfg *c_target =
 884                 container_of(to_config_group(usb_cfg_ci),
 885                              struct config_usb_cfg, group);
 886         struct usb_configuration *c;
 887         int ret;
 888
 889         mutex_lock(&gi->lock);
 890         list_for_each_entry(c, &cdev->configs, list) {
 891                 if (c == &c_target->c)
 892                         break;
 893         }
 894         if (c != &c_target->c) {
 895                 ret = -EINVAL;
 896                 goto out;
 897         }
 898
 899         if (cdev->os_desc_config) {
 900                 ret = -EBUSY;
 901                 goto out;
 902         }
 903
 904         cdev->os_desc_config = &c_target->c;
 905         ret = 0;
 906
 907 out:
 908         mutex_unlock(&gi->lock);
 909         return ret;
 910 }
 911
 912 static int os_desc_unlink(struct config_item *os_desc_ci,
 913                           struct config_item *usb_cfg_ci)
 914 {
 915         struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
 916                                         struct gadget_info, os_desc_group);
 917         struct usb_composite_dev *cdev = &gi->cdev;
 918
 919         mutex_lock(&gi->lock);
 920         if (gi->udc_name)
 921                 unregister_gadget(gi);
 922         cdev->os_desc_config = NULL;
 923         WARN_ON(gi->udc_name);
 924         mutex_unlock(&gi->lock);
 925         return 0;
 926 }
 927
 928 static struct configfs_item_operations os_desc_ops = {
 929         .release                = os_desc_attr_release,
 930         .show_attribute         = os_desc_attr_show,
 931         .store_attribute        = os_desc_attr_store,
 932         .allow_link             = os_desc_link,
 933         .drop_link              = os_desc_unlink,
 934 };
 935
 936 static struct config_item_type os_desc_type = {
 937         .ct_item_ops    = &os_desc_ops,
 938         .ct_attrs       = os_desc_attrs,
 939         .ct_owner       = THIS_MODULE,
 940 };
 941
 942 CONFIGFS_ATTR_STRUCT(usb_os_desc);
 943 CONFIGFS_ATTR_OPS(usb_os_desc);
 944
 945
 946 static inline struct usb_os_desc_ext_prop
 947 *to_usb_os_desc_ext_prop(struct config_item *item)
 948 {
 949         return container_of(item, struct usb_os_desc_ext_prop, item);
 950 }
 951
 952 CONFIGFS_ATTR_STRUCT(usb_os_desc_ext_prop);
 953 CONFIGFS_ATTR_OPS(usb_os_desc_ext_prop);
 954
 955 static ssize_t ext_prop_type_show(struct usb_os_desc_ext_prop *ext_prop,
 956                                   char *page)
 957 {
 958         return sprintf(page, "%d", ext_prop->type);
 959 }
 960
 961 static ssize_t ext_prop_type_store(struct usb_os_desc_ext_prop *ext_prop,
 962                                    const char *page, size_t len)
 963 {
 964         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
 965         u8 type;
 966         int ret;
 967
 968         if (desc->opts_mutex)
 969                 mutex_lock(desc->opts_mutex);
 970         ret = kstrtou8(page, 0, &type);
 971         if (ret)
 972                 goto end;
 973         if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
 974                 ret = -EINVAL;
 975                 goto end;
 976         }
 977
 978         if ((ext_prop->type == USB_EXT_PROP_BINARY ||
 979             ext_prop->type == USB_EXT_PROP_LE32 ||
 980             ext_prop->type == USB_EXT_PROP_BE32) &&
 981             (type == USB_EXT_PROP_UNICODE ||
 982             type == USB_EXT_PROP_UNICODE_ENV ||
 983             type == USB_EXT_PROP_UNICODE_LINK))
 984                 ext_prop->data_len <<= 1;
 985         else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
 986                    ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
 987                    ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
 988                    (type == USB_EXT_PROP_BINARY ||
 989                    type == USB_EXT_PROP_LE32 ||
 990                    type == USB_EXT_PROP_BE32))
 991                 ext_prop->data_len >>= 1;
 992         ext_prop->type = type;
 993         ret = len;
 994
 995 end:
 996         if (desc->opts_mutex)
 997                 mutex_unlock(desc->opts_mutex);
 998         return ret;
 999 }
1000
1001 static ssize_t ext_prop_data_show(struct usb_os_desc_ext_prop *ext_prop,
1002                                   char *page)
1003 {
1004         int len = ext_prop->data_len;
1005
1006         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1007             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1008             ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1009                 len >>= 1;
1010         memcpy(page, ext_prop->data, len);
1011
1012         return len;
1013 }
1014
1015 static ssize_t ext_prop_data_store(struct usb_os_desc_ext_prop *ext_prop,
1016                                    const char *page, size_t len)
1017 {
1018         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1019         char *new_data;
1020         size_t ret_len = len;
1021
1022         if (page[len - 1] == '\n' || page[len - 1] == '\0')
1023                 --len;
1024         new_data = kmemdup(page, len, GFP_KERNEL);
1025         if (!new_data)
1026                 return -ENOMEM;
1027
1028         if (desc->opts_mutex)
1029                 mutex_lock(desc->opts_mutex);
1030         kfree(ext_prop->data);
1031         ext_prop->data = new_data;
1032         desc->ext_prop_len -= ext_prop->data_len;
1033         ext_prop->data_len = len;
1034         desc->ext_prop_len += ext_prop->data_len;
1035         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1036             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1037             ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1038                 desc->ext_prop_len -= ext_prop->data_len;
1039                 ext_prop->data_len <<= 1;
1040                 ext_prop->data_len += 2;
1041                 desc->ext_prop_len += ext_prop->data_len;
1042         }
1043         if (desc->opts_mutex)
1044                 mutex_unlock(desc->opts_mutex);
1045         return ret_len;
1046 }
1047
1048 static struct usb_os_desc_ext_prop_attribute ext_prop_type =
1049         __CONFIGFS_ATTR(type, S_IRUGO | S_IWUSR,
1050                         ext_prop_type_show, ext_prop_type_store);
1051
1052 static struct usb_os_desc_ext_prop_attribute ext_prop_data =
1053         __CONFIGFS_ATTR(data, S_IRUGO | S_IWUSR,
1054                         ext_prop_data_show, ext_prop_data_store);
1055
1056 static struct configfs_attribute *ext_prop_attrs[] = {
1057         &ext_prop_type.attr,
1058         &ext_prop_data.attr,
1059         NULL,
1060 };
1061
1062 static void usb_os_desc_ext_prop_release(struct config_item *item)
1063 {
1064         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1065
1066         kfree(ext_prop); /* frees a whole chunk */
1067 }
1068
1069 static struct configfs_item_operations ext_prop_ops = {
1070         .release                = usb_os_desc_ext_prop_release,
1071         .show_attribute         = usb_os_desc_ext_prop_attr_show,
1072         .store_attribute        = usb_os_desc_ext_prop_attr_store,
1073 };
1074
1075 static struct config_item *ext_prop_make(
1076                 struct config_group *group,
1077                 const char *name)
1078 {
1079         struct usb_os_desc_ext_prop *ext_prop;
1080         struct config_item_type *ext_prop_type;
1081         struct usb_os_desc *desc;
1082         char *vlabuf;
1083
1084         vla_group(data_chunk);
1085         vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1086         vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1087
1088         vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1089         if (!vlabuf)
1090                 return ERR_PTR(-ENOMEM);
1091
1092         ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1093         ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1094
1095         desc = container_of(group, struct usb_os_desc, group);
1096         ext_prop_type->ct_item_ops = &ext_prop_ops;
1097         ext_prop_type->ct_attrs = ext_prop_attrs;
1098         ext_prop_type->ct_owner = desc->owner;
1099
1100         config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1101
1102         ext_prop->name = kstrdup(name, GFP_KERNEL);
1103         if (!ext_prop->name) {
1104                 kfree(vlabuf);
1105                 return ERR_PTR(-ENOMEM);
1106         }
1107         desc->ext_prop_len += 14;
1108         ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1109         if (desc->opts_mutex)
1110                 mutex_lock(desc->opts_mutex);
1111         desc->ext_prop_len += ext_prop->name_len;
1112         list_add_tail(&ext_prop->entry, &desc->ext_prop);
1113         ++desc->ext_prop_count;
1114         if (desc->opts_mutex)
1115                 mutex_unlock(desc->opts_mutex);
1116
1117         return &ext_prop->item;
1118 }
1119
1120 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1121 {
1122         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1123         struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1124
1125         if (desc->opts_mutex)
1126                 mutex_lock(desc->opts_mutex);
1127         list_del(&ext_prop->entry);
1128         --desc->ext_prop_count;
1129         kfree(ext_prop->name);
1130         desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1131         if (desc->opts_mutex)
1132                 mutex_unlock(desc->opts_mutex);
1133         config_item_put(item);
1134 }
1135
1136 static struct configfs_group_operations interf_grp_ops = {
1137         .make_item      = &ext_prop_make,
1138         .drop_item      = &ext_prop_drop,
1139 };
1140
1141 static struct configfs_item_operations interf_item_ops = {
1142         .show_attribute         = usb_os_desc_attr_show,
1143         .store_attribute        = usb_os_desc_attr_store,
1144 };
1145
1146 static ssize_t interf_grp_compatible_id_show(struct usb_os_desc *desc,
1147                                              char *page)
1148 {
1149         memcpy(page, desc->ext_compat_id, 8);
1150         return 8;
1151 }
1152
1153 static ssize_t interf_grp_compatible_id_store(struct usb_os_desc *desc,
1154                                               const char *page, size_t len)
1155 {
1156         int l;
1157
1158         l = min_t(int, 8, len);
1159         if (page[l - 1] == '\n')
1160                 --l;
1161         if (desc->opts_mutex)
1162                 mutex_lock(desc->opts_mutex);
1163         memcpy(desc->ext_compat_id, page, l);
1164         desc->ext_compat_id[l] = '\0';
1165
1166         if (desc->opts_mutex)
1167                 mutex_unlock(desc->opts_mutex);
1168
1169         return len;
1170 }
1171
1172 static struct usb_os_desc_attribute interf_grp_attr_compatible_id =
1173         __CONFIGFS_ATTR(compatible_id, S_IRUGO | S_IWUSR,
1174                         interf_grp_compatible_id_show,
1175                         interf_grp_compatible_id_store);
1176
1177 static ssize_t interf_grp_sub_compatible_id_show(struct usb_os_desc *desc,
1178                                                  char *page)
1179 {
1180         memcpy(page, desc->ext_compat_id + 8, 8);
1181         return 8;
1182 }
1183
1184 static ssize_t interf_grp_sub_compatible_id_store(struct usb_os_desc *desc,
1185                                                   const char *page, size_t len)
1186 {
1187         int l;
1188
1189         l = min_t(int, 8, len);
1190         if (page[l - 1] == '\n')
1191                 --l;
1192         if (desc->opts_mutex)
1193                 mutex_lock(desc->opts_mutex);
1194         memcpy(desc->ext_compat_id + 8, page, l);
1195         desc->ext_compat_id[l + 8] = '\0';
1196
1197         if (desc->opts_mutex)
1198                 mutex_unlock(desc->opts_mutex);
1199
1200         return len;
1201 }
1202
1203 static struct usb_os_desc_attribute interf_grp_attr_sub_compatible_id =
1204         __CONFIGFS_ATTR(sub_compatible_id, S_IRUGO | S_IWUSR,
1205                         interf_grp_sub_compatible_id_show,
1206                         interf_grp_sub_compatible_id_store);
1207
1208 static struct configfs_attribute *interf_grp_attrs[] = {
1209         &interf_grp_attr_compatible_id.attr,
1210         &interf_grp_attr_sub_compatible_id.attr,
1211         NULL
1212 };
1213
1214 int usb_os_desc_prepare_interf_dir(struct config_group *parent,
1215                                    int n_interf,
1216                                    struct usb_os_desc **desc,
1217                                    char **names,
1218                                    struct module *owner)
1219 {
1220         struct config_group **f_default_groups, *os_desc_group,
1221                                 **interface_groups;
1222         struct config_item_type *os_desc_type, *interface_type;
1223
1224         vla_group(data_chunk);
1225         vla_item(data_chunk, struct config_group *, f_default_groups, 2);
1226         vla_item(data_chunk, struct config_group, os_desc_group, 1);
1227         vla_item(data_chunk, struct config_group *, interface_groups,
1228                  n_interf + 1);
1229         vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1230         vla_item(data_chunk, struct config_item_type, interface_type, 1);
1231
1232         char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1233         if (!vlabuf)
1234                 return -ENOMEM;
1235
1236         f_default_groups = vla_ptr(vlabuf, data_chunk, f_default_groups);
1237         os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1238         os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1239         interface_groups = vla_ptr(vlabuf, data_chunk, interface_groups);
1240         interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1241
1242         parent->default_groups = f_default_groups;
1243         os_desc_type->ct_owner = owner;
1244         config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1245         f_default_groups[0] = os_desc_group;
1246
1247         os_desc_group->default_groups = interface_groups;
1248         interface_type->ct_item_ops = &interf_item_ops;
1249         interface_type->ct_group_ops = &interf_grp_ops;
1250         interface_type->ct_attrs = interf_grp_attrs;
1251         interface_type->ct_owner = owner;
1252
1253         while (n_interf--) {
1254                 struct usb_os_desc *d;
1255
1256                 d = desc[n_interf];
1257                 d->owner = owner;
1258                 config_group_init_type_name(&d->group, "", interface_type);
1259                 config_item_set_name(&d->group.cg_item, "interface.%s",
1260                                      names[n_interf]);
1261                 interface_groups[n_interf] = &d->group;
1262         }
1263
1264         return 0;
1265 }
1266 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1267
1268 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1269 {
1270         WARN_ON(1);
1271         return -EINVAL;
1272 }
1273
1274 int composite_dev_prepare(struct usb_composite_driver *composite,
1275                 struct usb_composite_dev *dev);
1276
1277 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1278                                   struct usb_ep *ep0);
1279
1280 static void purge_configs_funcs(struct gadget_info *gi)
1281 {
1282         struct usb_configuration        *c;
1283
1284         list_for_each_entry(c, &gi->cdev.configs, list) {
1285                 struct usb_function *f, *tmp;
1286                 struct config_usb_cfg *cfg;
1287
1288                 cfg = container_of(c, struct config_usb_cfg, c);
1289
1290                 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1291
1292                         list_move_tail(&f->list, &cfg->func_list);
1293                         if (f->unbind) {
1294                                 dev_err(&gi->cdev.gadget->dev, "unbind function"
1295                                                 " '%s'/%p\n", f->name, f);
1296                                 f->unbind(c, f);
1297                         }
1298                 }
1299                 c->next_interface_id = 0;
1300                 c->superspeed = 0;
1301                 c->highspeed = 0;
1302                 c->fullspeed = 0;
1303         }
1304 }
1305
1306 static int configfs_composite_bind(struct usb_gadget *gadget,
1307                 struct usb_gadget_driver *gdriver)
1308 {
1309         struct usb_composite_driver     *composite = to_cdriver(gdriver);
1310         struct gadget_info              *gi = container_of(composite,
1311                                                 struct gadget_info, composite);
1312         struct usb_composite_dev        *cdev = &gi->cdev;
1313         struct usb_configuration        *c;
1314         struct usb_string               *s;
1315         unsigned                        i;
1316         int                             ret;
1317
1318         /* the gi->lock is hold by the caller */
1319         cdev->gadget = gadget;
1320         set_gadget_data(gadget, cdev);
1321         ret = composite_dev_prepare(composite, cdev);
1322         if (ret)
1323                 return ret;
1324         /* and now the gadget bind */
1325         ret = -EINVAL;
1326
1327         if (list_empty(&gi->cdev.configs)) {
1328                 pr_err("Need at least one configuration in %s.\n",
1329                                 gi->composite.name);
1330                 goto err_comp_cleanup;
1331         }
1332
1333
1334         list_for_each_entry(c, &gi->cdev.configs, list) {
1335                 struct config_usb_cfg *cfg;
1336
1337                 cfg = container_of(c, struct config_usb_cfg, c);
1338                 if (list_empty(&cfg->func_list)) {
1339                         pr_err("Config %s/%d of %s needs at least one function.\n",
1340                               c->label, c->bConfigurationValue,
1341                               gi->composite.name);
1342                         goto err_comp_cleanup;
1343                 }
1344         }
1345
1346         /* init all strings */
1347         if (!list_empty(&gi->string_list)) {
1348                 struct gadget_strings *gs;
1349
1350                 i = 0;
1351                 list_for_each_entry(gs, &gi->string_list, list) {
1352
1353                         gi->gstrings[i] = &gs->stringtab_dev;
1354                         gs->stringtab_dev.strings = gs->strings;
1355                         gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1356                                 gs->manufacturer;
1357                         gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1358                         gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1359                         i++;
1360                 }
1361                 gi->gstrings[i] = NULL;
1362                 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1363                                 USB_GADGET_FIRST_AVAIL_IDX);
1364                 if (IS_ERR(s)) {
1365                         ret = PTR_ERR(s);
1366                         goto err_comp_cleanup;
1367                 }
1368
1369                 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1370                 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1371                 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1372         }
1373
1374         if (gi->use_os_desc) {
1375                 cdev->use_os_string = true;
1376                 cdev->b_vendor_code = gi->b_vendor_code;
1377                 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1378         }
1379
1380         /* Go through all configs, attach all functions */
1381         list_for_each_entry(c, &gi->cdev.configs, list) {
1382                 struct config_usb_cfg *cfg;
1383                 struct usb_function *f;
1384                 struct usb_function *tmp;
1385                 struct gadget_config_name *cn;
1386
1387                 cfg = container_of(c, struct config_usb_cfg, c);
1388                 if (!list_empty(&cfg->string_list)) {
1389                         i = 0;
1390                         list_for_each_entry(cn, &cfg->string_list, list) {
1391                                 cfg->gstrings[i] = &cn->stringtab_dev;
1392                                 cn->stringtab_dev.strings = &cn->strings;
1393                                 cn->strings.s = cn->configuration;
1394                                 i++;
1395                         }
1396                         cfg->gstrings[i] = NULL;
1397                         s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1398                         if (IS_ERR(s)) {
1399                                 ret = PTR_ERR(s);
1400                                 goto err_comp_cleanup;
1401                         }
1402                         c->iConfiguration = s[0].id;
1403                 }
1404
1405                 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1406                         list_del(&f->list);
1407                         ret = usb_add_function(c, f);
1408                         if (ret) {
1409                                 list_add(&f->list, &cfg->func_list);
1410                                 goto err_purge_funcs;
1411                         }
1412                 }
1413                 usb_ep_autoconfig_reset(cdev->gadget);
1414         }
1415         if (cdev->use_os_string) {
1416                 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1417                 if (ret)
1418                         goto err_purge_funcs;
1419         }
1420
1421         usb_ep_autoconfig_reset(cdev->gadget);
1422         return 0;
1423
1424 err_purge_funcs:
1425         purge_configs_funcs(gi);
1426 err_comp_cleanup:
1427         composite_dev_cleanup(cdev);
1428         return ret;
1429 }
1430
1431 static void configfs_composite_unbind(struct usb_gadget *gadget)
1432 {
1433         struct usb_composite_dev        *cdev;
1434         struct gadget_info              *gi;
1435
1436         /* the gi->lock is hold by the caller */
1437
1438         cdev = get_gadget_data(gadget);
1439         gi = container_of(cdev, struct gadget_info, cdev);
1440
1441         purge_configs_funcs(gi);
1442         composite_dev_cleanup(cdev);
1443         usb_ep_autoconfig_reset(cdev->gadget);
1444         cdev->gadget = NULL;
1445         set_gadget_data(gadget, NULL);
1446 }
1447
1448 static const struct usb_gadget_driver configfs_driver_template = {
1449         .bind           = configfs_composite_bind,
1450         .unbind         = configfs_composite_unbind,
1451
1452         .setup          = composite_setup,
1453         .reset          = composite_disconnect,
1454         .disconnect     = composite_disconnect,
1455
1456         .suspend        = composite_suspend,
1457         .resume         = composite_resume,
1458
1459         .max_speed      = USB_SPEED_SUPER,
1460         .driver = {
1461                 .owner          = THIS_MODULE,
1462                 .name           = "configfs-gadget",
1463         },
1464 };
1465
1466 static struct config_group *gadgets_make(
1467                 struct config_group *group,
1468                 const char *name)
1469 {
1470         struct gadget_info *gi;
1471
1472         gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1473         if (!gi)
1474                 return ERR_PTR(-ENOMEM);
1475
1476         gi->group.default_groups = gi->default_groups;
1477         gi->group.default_groups[0] = &gi->functions_group;
1478         gi->group.default_groups[1] = &gi->configs_group;
1479         gi->group.default_groups[2] = &gi->strings_group;
1480         gi->group.default_groups[3] = &gi->os_desc_group;
1481
1482         config_group_init_type_name(&gi->functions_group, "functions",
1483                         &functions_type);
1484         config_group_init_type_name(&gi->configs_group, "configs",
1485                         &config_desc_type);
1486         config_group_init_type_name(&gi->strings_group, "strings",
1487                         &gadget_strings_strings_type);
1488         config_group_init_type_name(&gi->os_desc_group, "os_desc",
1489                         &os_desc_type);
1490
1491         gi->composite.bind = configfs_do_nothing;
1492         gi->composite.unbind = configfs_do_nothing;
1493         gi->composite.suspend = NULL;
1494         gi->composite.resume = NULL;
1495         gi->composite.max_speed = USB_SPEED_SUPER;
1496
1497         mutex_init(&gi->lock);
1498         INIT_LIST_HEAD(&gi->string_list);
1499         INIT_LIST_HEAD(&gi->available_func);
1500
1501         composite_init_dev(&gi->cdev);
1502         gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1503         gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1504         gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1505
1506         gi->composite.gadget_driver = configfs_driver_template;
1507
1508         gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1509         gi->composite.name = gi->composite.gadget_driver.function;
1510
1511         if (!gi->composite.gadget_driver.function)
1512                 goto err;
1513
1514 #ifdef CONFIG_USB_OTG
1515         gi->otg.bLength = sizeof(struct usb_otg_descriptor);
1516         gi->otg.bDescriptorType = USB_DT_OTG;
1517         gi->otg.bmAttributes = USB_OTG_SRP | USB_OTG_HNP;
1518 #endif
1519
1520         config_group_init_type_name(&gi->group, name,
1521                                 &gadget_root_type);
1522         return &gi->group;
1523 err:
1524         kfree(gi);
1525         return ERR_PTR(-ENOMEM);
1526 }
1527
1528 static void gadgets_drop(struct config_group *group, struct config_item *item)
1529 {
1530         config_item_put(item);
1531 }
1532
1533 static struct configfs_group_operations gadgets_ops = {
1534         .make_group     = &gadgets_make,
1535         .drop_item      = &gadgets_drop,
1536 };
1537
1538 static struct config_item_type gadgets_type = {
1539         .ct_group_ops   = &gadgets_ops,
1540         .ct_owner       = THIS_MODULE,
1541 };
1542
1543 static struct configfs_subsystem gadget_subsys = {
1544         .su_group = {
1545                 .cg_item = {
1546                         .ci_namebuf = "usb_gadget",
1547                         .ci_type = &gadgets_type,
1548                 },
1549         },
1550         .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1551 };
1552
1553 void unregister_gadget_item(struct config_item *item)
1554 {
1555         struct gadget_info *gi = to_gadget_info(item);
1556
1557         unregister_gadget(gi);
1558 }
1559 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1560
1561 static int __init gadget_cfs_init(void)
1562 {
1563         int ret;
1564
1565         config_group_init(&gadget_subsys.su_group);
1566
1567         ret = configfs_register_subsystem(&gadget_subsys);
1568         return ret;
1569 }
1570 module_init(gadget_cfs_init);
1571
1572 static void __exit gadget_cfs_exit(void)
1573 {
1574         configfs_unregister_subsystem(&gadget_subsys);
1575 }
1576 module_exit(gadget_cfs_exit);