drivers/usb/gadget/configfs.c

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