drivers/usb/gadget/configfs.c

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