drivers/usb/gadget/configfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/configfs.h>
   3 #include <linux/module.h>
   4 #include <linux/slab.h>
   5 #include <linux/device.h>
   6 #include <linux/kstrtox.h>
   7 #include <linux/nls.h>
   8 #include <linux/usb/composite.h>
   9 #include <linux/usb/gadget_configfs.h>
  10 #include "configfs.h"
  11 #include "u_f.h"
  12 #include "u_os_desc.h"
  13
  14 int check_user_usb_string(const char *name,
  15                 struct usb_gadget_strings *stringtab_dev)
  16 {
  17         u16 num;
  18         int ret;
  19
  20         ret = kstrtou16(name, 0, &num);
  21         if (ret)
  22                 return ret;
  23
  24         if (!usb_validate_langid(num))
  25                 return -EINVAL;
  26
  27         stringtab_dev->language = num;
  28         return 0;
  29 }
  30
  31 #define MAX_NAME_LEN    40
  32 #define MAX_USB_STRING_LANGS 2
  33
  34 static const struct usb_descriptor_header *otg_desc[2];
  35
  36 struct gadget_info {
  37         struct config_group group;
  38         struct config_group functions_group;
  39         struct config_group configs_group;
  40         struct config_group strings_group;
  41         struct config_group os_desc_group;
  42
  43         struct mutex lock;
  44         struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
  45         struct list_head string_list;
  46         struct list_head available_func;
  47
  48         struct usb_composite_driver composite;
  49         struct usb_composite_dev cdev;
  50         bool use_os_desc;
  51         char b_vendor_code;
  52         char qw_sign[OS_STRING_QW_SIGN_LEN];
  53         spinlock_t spinlock;
  54         bool unbind;
  55 };
  56
  57 static inline struct gadget_info *to_gadget_info(struct config_item *item)
  58 {
  59         return container_of(to_config_group(item), struct gadget_info, group);
  60 }
  61
  62 struct config_usb_cfg {
  63         struct config_group group;
  64         struct config_group strings_group;
  65         struct list_head string_list;
  66         struct usb_configuration c;
  67         struct list_head func_list;
  68         struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
  69 };
  70
  71 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
  72 {
  73         return container_of(to_config_group(item), struct config_usb_cfg,
  74                         group);
  75 }
  76
  77 static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg)
  78 {
  79         return container_of(cfg->c.cdev, struct gadget_info, cdev);
  80 }
  81
  82 struct gadget_strings {
  83         struct usb_gadget_strings stringtab_dev;
  84         struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
  85         char *manufacturer;
  86         char *product;
  87         char *serialnumber;
  88
  89         struct config_group group;
  90         struct list_head list;
  91 };
  92
  93 struct gadget_config_name {
  94         struct usb_gadget_strings stringtab_dev;
  95         struct usb_string strings;
  96         char *configuration;
  97
  98         struct config_group group;
  99         struct list_head list;
 100 };
 101
 102 #define USB_MAX_STRING_WITH_NULL_LEN    (USB_MAX_STRING_LEN+1)
 103
 104 static int usb_string_copy(const char *s, char **s_copy)
 105 {
 106         int ret;
 107         char *str;
 108         char *copy = *s_copy;
 109         ret = strlen(s);
 110         if (ret > USB_MAX_STRING_LEN)
 111                 return -EOVERFLOW;
 112
 113         if (copy) {
 114                 str = copy;
 115         } else {
 116                 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
 117                 if (!str)
 118                         return -ENOMEM;
 119         }
 120         strcpy(str, s);
 121         if (str[ret - 1] == '\n')
 122                 str[ret - 1] = '\0';
 123         *s_copy = str;
 124         return 0;
 125 }
 126
 127 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name)      \
 128 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
 129                         char *page)     \
 130 {       \
 131         return sprintf(page, "0x%02x\n", \
 132                 to_gadget_info(item)->cdev.desc.__name); \
 133 }
 134
 135 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name)     \
 136 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
 137                         char *page)     \
 138 {       \
 139         return sprintf(page, "0x%04x\n", \
 140                 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
 141 }
 142
 143
 144 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name)               \
 145 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 146                 const char *page, size_t len)           \
 147 {                                                       \
 148         u8 val;                                         \
 149         int ret;                                        \
 150         ret = kstrtou8(page, 0, &val);                  \
 151         if (ret)                                        \
 152                 return ret;                             \
 153         to_gadget_info(item)->cdev.desc._name = val;    \
 154         return len;                                     \
 155 }
 156
 157 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name)      \
 158 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 159                 const char *page, size_t len)           \
 160 {                                                       \
 161         u16 val;                                        \
 162         int ret;                                        \
 163         ret = kstrtou16(page, 0, &val);                 \
 164         if (ret)                                        \
 165                 return ret;                             \
 166         to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val);     \
 167         return len;                                     \
 168 }
 169
 170 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type)  \
 171         GI_DEVICE_DESC_SIMPLE_R_##_type(_name)  \
 172         GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
 173
 174 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
 175 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
 176 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
 177 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
 178 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
 179 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
 180 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
 181 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
 182
 183 static ssize_t is_valid_bcd(u16 bcd_val)
 184 {
 185         if ((bcd_val & 0xf) > 9)
 186                 return -EINVAL;
 187         if (((bcd_val >> 4) & 0xf) > 9)
 188                 return -EINVAL;
 189         if (((bcd_val >> 8) & 0xf) > 9)
 190                 return -EINVAL;
 191         if (((bcd_val >> 12) & 0xf) > 9)
 192                 return -EINVAL;
 193         return 0;
 194 }
 195
 196 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
 197                 const char *page, size_t len)
 198 {
 199         u16 bcdDevice;
 200         int ret;
 201
 202         ret = kstrtou16(page, 0, &bcdDevice);
 203         if (ret)
 204                 return ret;
 205         ret = is_valid_bcd(bcdDevice);
 206         if (ret)
 207                 return ret;
 208
 209         to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
 210         return len;
 211 }
 212
 213 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
 214                 const char *page, size_t len)
 215 {
 216         u16 bcdUSB;
 217         int ret;
 218
 219         ret = kstrtou16(page, 0, &bcdUSB);
 220         if (ret)
 221                 return ret;
 222         ret = is_valid_bcd(bcdUSB);
 223         if (ret)
 224                 return ret;
 225
 226         to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
 227         return len;
 228 }
 229
 230 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
 231 {
 232         struct gadget_info *gi = to_gadget_info(item);
 233         char *udc_name;
 234         int ret;
 235
 236         mutex_lock(&gi->lock);
 237         udc_name = gi->composite.gadget_driver.udc_name;
 238         ret = sprintf(page, "%s\n", udc_name ?: "");
 239         mutex_unlock(&gi->lock);
 240
 241         return ret;
 242 }
 243
 244 static int unregister_gadget(struct gadget_info *gi)
 245 {
 246         int ret;
 247
 248         if (!gi->composite.gadget_driver.udc_name)
 249                 return -ENODEV;
 250
 251         ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
 252         if (ret)
 253                 return ret;
 254         kfree(gi->composite.gadget_driver.udc_name);
 255         gi->composite.gadget_driver.udc_name = NULL;
 256         return 0;
 257 }
 258
 259 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
 260                 const char *page, size_t len)
 261 {
 262         struct gadget_info *gi = to_gadget_info(item);
 263         char *name;
 264         int ret;
 265
 266         if (strlen(page) < len)
 267                 return -EOVERFLOW;
 268
 269         name = kstrdup(page, GFP_KERNEL);
 270         if (!name)
 271                 return -ENOMEM;
 272         if (name[len - 1] == '\n')
 273                 name[len - 1] = '\0';
 274
 275         mutex_lock(&gi->lock);
 276
 277         if (!strlen(name)) {
 278                 ret = unregister_gadget(gi);
 279                 if (ret)
 280                         goto err;
 281                 kfree(name);
 282         } else {
 283                 if (gi->composite.gadget_driver.udc_name) {
 284                         ret = -EBUSY;
 285                         goto err;
 286                 }
 287                 gi->composite.gadget_driver.udc_name = name;
 288                 ret = usb_gadget_register_driver(&gi->composite.gadget_driver);
 289                 if (ret) {
 290                         gi->composite.gadget_driver.udc_name = NULL;
 291                         goto err;
 292                 }
 293         }
 294         mutex_unlock(&gi->lock);
 295         return len;
 296 err:
 297         kfree(name);
 298         mutex_unlock(&gi->lock);
 299         return ret;
 300 }
 301
 302 static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
 303                                               char *page)
 304 {
 305         enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
 306
 307         return sprintf(page, "%s\n", usb_speed_string(speed));
 308 }
 309
 310 static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
 311                                                const char *page, size_t len)
 312 {
 313         struct gadget_info *gi = to_gadget_info(item);
 314
 315         mutex_lock(&gi->lock);
 316
 317         /* Prevent changing of max_speed after the driver is binded */
 318         if (gi->composite.gadget_driver.udc_name)
 319                 goto err;
 320
 321         if (strncmp(page, "super-speed-plus", 16) == 0)
 322                 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
 323         else if (strncmp(page, "super-speed", 11) == 0)
 324                 gi->composite.max_speed = USB_SPEED_SUPER;
 325         else if (strncmp(page, "high-speed", 10) == 0)
 326                 gi->composite.max_speed = USB_SPEED_HIGH;
 327         else if (strncmp(page, "full-speed", 10) == 0)
 328                 gi->composite.max_speed = USB_SPEED_FULL;
 329         else if (strncmp(page, "low-speed", 9) == 0)
 330                 gi->composite.max_speed = USB_SPEED_LOW;
 331         else
 332                 goto err;
 333
 334         gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
 335
 336         mutex_unlock(&gi->lock);
 337         return len;
 338 err:
 339         mutex_unlock(&gi->lock);
 340         return -EINVAL;
 341 }
 342
 343 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
 344 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
 345 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
 346 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
 347 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
 348 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
 349 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
 350 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
 351 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
 352 CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
 353
 354 static struct configfs_attribute *gadget_root_attrs[] = {
 355         &gadget_dev_desc_attr_bDeviceClass,
 356         &gadget_dev_desc_attr_bDeviceSubClass,
 357         &gadget_dev_desc_attr_bDeviceProtocol,
 358         &gadget_dev_desc_attr_bMaxPacketSize0,
 359         &gadget_dev_desc_attr_idVendor,
 360         &gadget_dev_desc_attr_idProduct,
 361         &gadget_dev_desc_attr_bcdDevice,
 362         &gadget_dev_desc_attr_bcdUSB,
 363         &gadget_dev_desc_attr_UDC,
 364         &gadget_dev_desc_attr_max_speed,
 365         NULL,
 366 };
 367
 368 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
 369 {
 370         return container_of(to_config_group(item), struct gadget_strings,
 371                          group);
 372 }
 373
 374 static inline struct gadget_config_name *to_gadget_config_name(
 375                 struct config_item *item)
 376 {
 377         return container_of(to_config_group(item), struct gadget_config_name,
 378                          group);
 379 }
 380
 381 static inline struct usb_function_instance *to_usb_function_instance(
 382                 struct config_item *item)
 383 {
 384         return container_of(to_config_group(item),
 385                          struct usb_function_instance, group);
 386 }
 387
 388 static void gadget_info_attr_release(struct config_item *item)
 389 {
 390         struct gadget_info *gi = to_gadget_info(item);
 391
 392         WARN_ON(!list_empty(&gi->cdev.configs));
 393         WARN_ON(!list_empty(&gi->string_list));
 394         WARN_ON(!list_empty(&gi->available_func));
 395         kfree(gi->composite.gadget_driver.function);
 396         kfree(gi);
 397 }
 398
 399 static struct configfs_item_operations gadget_root_item_ops = {
 400         .release                = gadget_info_attr_release,
 401 };
 402
 403 static void gadget_config_attr_release(struct config_item *item)
 404 {
 405         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 406
 407         WARN_ON(!list_empty(&cfg->c.functions));
 408         list_del(&cfg->c.list);
 409         kfree(cfg->c.label);
 410         kfree(cfg);
 411 }
 412
 413 static int config_usb_cfg_link(
 414         struct config_item *usb_cfg_ci,
 415         struct config_item *usb_func_ci)
 416 {
 417         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 418         struct gadget_info *gi = cfg_to_gadget_info(cfg);
 419
 420         struct usb_function_instance *fi =
 421                         to_usb_function_instance(usb_func_ci);
 422         struct usb_function_instance *a_fi = NULL, *iter;
 423         struct usb_function *f;
 424         int ret;
 425
 426         mutex_lock(&gi->lock);
 427         /*
 428          * Make sure this function is from within our _this_ gadget and not
 429          * from another gadget or a random directory.
 430          * Also a function instance can only be linked once.
 431          */
 432         list_for_each_entry(iter, &gi->available_func, cfs_list) {
 433                 if (iter != fi)
 434                         continue;
 435                 a_fi = iter;
 436                 break;
 437         }
 438         if (!a_fi) {
 439                 ret = -EINVAL;
 440                 goto out;
 441         }
 442
 443         list_for_each_entry(f, &cfg->func_list, list) {
 444                 if (f->fi == fi) {
 445                         ret = -EEXIST;
 446                         goto out;
 447                 }
 448         }
 449
 450         f = usb_get_function(fi);
 451         if (IS_ERR(f)) {
 452                 ret = PTR_ERR(f);
 453                 goto out;
 454         }
 455
 456         /* stash the function until we bind it to the gadget */
 457         list_add_tail(&f->list, &cfg->func_list);
 458         ret = 0;
 459 out:
 460         mutex_unlock(&gi->lock);
 461         return ret;
 462 }
 463
 464 static void config_usb_cfg_unlink(
 465         struct config_item *usb_cfg_ci,
 466         struct config_item *usb_func_ci)
 467 {
 468         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 469         struct gadget_info *gi = cfg_to_gadget_info(cfg);
 470
 471         struct usb_function_instance *fi =
 472                         to_usb_function_instance(usb_func_ci);
 473         struct usb_function *f;
 474
 475         /*
 476          * ideally I would like to forbid to unlink functions while a gadget is
 477          * bound to an UDC. Since this isn't possible at the moment, we simply
 478          * force an unbind, the function is available here and then we can
 479          * remove the function.
 480          */
 481         mutex_lock(&gi->lock);
 482         if (gi->composite.gadget_driver.udc_name)
 483                 unregister_gadget(gi);
 484         WARN_ON(gi->composite.gadget_driver.udc_name);
 485
 486         list_for_each_entry(f, &cfg->func_list, list) {
 487                 if (f->fi == fi) {
 488                         list_del(&f->list);
 489                         usb_put_function(f);
 490                         mutex_unlock(&gi->lock);
 491                         return;
 492                 }
 493         }
 494         mutex_unlock(&gi->lock);
 495         WARN(1, "Unable to locate function to unbind\n");
 496 }
 497
 498 static struct configfs_item_operations gadget_config_item_ops = {
 499         .release                = gadget_config_attr_release,
 500         .allow_link             = config_usb_cfg_link,
 501         .drop_link              = config_usb_cfg_unlink,
 502 };
 503
 504
 505 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
 506                 char *page)
 507 {
 508         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 509
 510         return sprintf(page, "%u\n", cfg->c.MaxPower);
 511 }
 512
 513 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
 514                 const char *page, size_t len)
 515 {
 516         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 517         u16 val;
 518         int ret;
 519         ret = kstrtou16(page, 0, &val);
 520         if (ret)
 521                 return ret;
 522         if (DIV_ROUND_UP(val, 8) > 0xff)
 523                 return -ERANGE;
 524         cfg->c.MaxPower = val;
 525         return len;
 526 }
 527
 528 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
 529                 char *page)
 530 {
 531         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 532
 533         return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
 534 }
 535
 536 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
 537                 const char *page, size_t len)
 538 {
 539         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 540         u8 val;
 541         int ret;
 542         ret = kstrtou8(page, 0, &val);
 543         if (ret)
 544                 return ret;
 545         if (!(val & USB_CONFIG_ATT_ONE))
 546                 return -EINVAL;
 547         if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
 548                                 USB_CONFIG_ATT_WAKEUP))
 549                 return -EINVAL;
 550         cfg->c.bmAttributes = val;
 551         return len;
 552 }
 553
 554 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
 555 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
 556
 557 static struct configfs_attribute *gadget_config_attrs[] = {
 558         &gadget_config_desc_attr_MaxPower,
 559         &gadget_config_desc_attr_bmAttributes,
 560         NULL,
 561 };
 562
 563 static const struct config_item_type gadget_config_type = {
 564         .ct_item_ops    = &gadget_config_item_ops,
 565         .ct_attrs       = gadget_config_attrs,
 566         .ct_owner       = THIS_MODULE,
 567 };
 568
 569 static const struct config_item_type gadget_root_type = {
 570         .ct_item_ops    = &gadget_root_item_ops,
 571         .ct_attrs       = gadget_root_attrs,
 572         .ct_owner       = THIS_MODULE,
 573 };
 574
 575 static void composite_init_dev(struct usb_composite_dev *cdev)
 576 {
 577         spin_lock_init(&cdev->lock);
 578         INIT_LIST_HEAD(&cdev->configs);
 579         INIT_LIST_HEAD(&cdev->gstrings);
 580 }
 581
 582 static struct config_group *function_make(
 583                 struct config_group *group,
 584                 const char *name)
 585 {
 586         struct gadget_info *gi;
 587         struct usb_function_instance *fi;
 588         char buf[MAX_NAME_LEN];
 589         char *func_name;
 590         char *instance_name;
 591         int ret;
 592
 593         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
 594         if (ret >= MAX_NAME_LEN)
 595                 return ERR_PTR(-ENAMETOOLONG);
 596
 597         func_name = buf;
 598         instance_name = strchr(func_name, '.');
 599         if (!instance_name) {
 600                 pr_err("Unable to locate . in FUNC.INSTANCE\n");
 601                 return ERR_PTR(-EINVAL);
 602         }
 603         *instance_name = '\0';
 604         instance_name++;
 605
 606         fi = usb_get_function_instance(func_name);
 607         if (IS_ERR(fi))
 608                 return ERR_CAST(fi);
 609
 610         ret = config_item_set_name(&fi->group.cg_item, "%s", name);
 611         if (ret) {
 612                 usb_put_function_instance(fi);
 613                 return ERR_PTR(ret);
 614         }
 615         if (fi->set_inst_name) {
 616                 ret = fi->set_inst_name(fi, instance_name);
 617                 if (ret) {
 618                         usb_put_function_instance(fi);
 619                         return ERR_PTR(ret);
 620                 }
 621         }
 622
 623         gi = container_of(group, struct gadget_info, functions_group);
 624
 625         mutex_lock(&gi->lock);
 626         list_add_tail(&fi->cfs_list, &gi->available_func);
 627         mutex_unlock(&gi->lock);
 628         return &fi->group;
 629 }
 630
 631 static void function_drop(
 632                 struct config_group *group,
 633                 struct config_item *item)
 634 {
 635         struct usb_function_instance *fi = to_usb_function_instance(item);
 636         struct gadget_info *gi;
 637
 638         gi = container_of(group, struct gadget_info, functions_group);
 639
 640         mutex_lock(&gi->lock);
 641         list_del(&fi->cfs_list);
 642         mutex_unlock(&gi->lock);
 643         config_item_put(item);
 644 }
 645
 646 static struct configfs_group_operations functions_ops = {
 647         .make_group     = &function_make,
 648         .drop_item      = &function_drop,
 649 };
 650
 651 static const struct config_item_type functions_type = {
 652         .ct_group_ops   = &functions_ops,
 653         .ct_owner       = THIS_MODULE,
 654 };
 655
 656 GS_STRINGS_RW(gadget_config_name, configuration);
 657
 658 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
 659         &gadget_config_name_attr_configuration,
 660         NULL,
 661 };
 662
 663 static void gadget_config_name_attr_release(struct config_item *item)
 664 {
 665         struct gadget_config_name *cn = to_gadget_config_name(item);
 666
 667         kfree(cn->configuration);
 668
 669         list_del(&cn->list);
 670         kfree(cn);
 671 }
 672
 673 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
 674 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
 675
 676 static struct config_group *config_desc_make(
 677                 struct config_group *group,
 678                 const char *name)
 679 {
 680         struct gadget_info *gi;
 681         struct config_usb_cfg *cfg;
 682         char buf[MAX_NAME_LEN];
 683         char *num_str;
 684         u8 num;
 685         int ret;
 686
 687         gi = container_of(group, struct gadget_info, configs_group);
 688         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
 689         if (ret >= MAX_NAME_LEN)
 690                 return ERR_PTR(-ENAMETOOLONG);
 691
 692         num_str = strchr(buf, '.');
 693         if (!num_str) {
 694                 pr_err("Unable to locate . in name.bConfigurationValue\n");
 695                 return ERR_PTR(-EINVAL);
 696         }
 697
 698         *num_str = '\0';
 699         num_str++;
 700
 701         if (!strlen(buf))
 702                 return ERR_PTR(-EINVAL);
 703
 704         ret = kstrtou8(num_str, 0, &num);
 705         if (ret)
 706                 return ERR_PTR(ret);
 707
 708         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 709         if (!cfg)
 710                 return ERR_PTR(-ENOMEM);
 711         cfg->c.label = kstrdup(buf, GFP_KERNEL);
 712         if (!cfg->c.label) {
 713                 ret = -ENOMEM;
 714                 goto err;
 715         }
 716         cfg->c.bConfigurationValue = num;
 717         cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
 718         cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
 719         INIT_LIST_HEAD(&cfg->string_list);
 720         INIT_LIST_HEAD(&cfg->func_list);
 721
 722         config_group_init_type_name(&cfg->group, name,
 723                                 &gadget_config_type);
 724
 725         config_group_init_type_name(&cfg->strings_group, "strings",
 726                         &gadget_config_name_strings_type);
 727         configfs_add_default_group(&cfg->strings_group, &cfg->group);
 728
 729         ret = usb_add_config_only(&gi->cdev, &cfg->c);
 730         if (ret)
 731                 goto err;
 732
 733         return &cfg->group;
 734 err:
 735         kfree(cfg->c.label);
 736         kfree(cfg);
 737         return ERR_PTR(ret);
 738 }
 739
 740 static void config_desc_drop(
 741                 struct config_group *group,
 742                 struct config_item *item)
 743 {
 744         config_item_put(item);
 745 }
 746
 747 static struct configfs_group_operations config_desc_ops = {
 748         .make_group     = &config_desc_make,
 749         .drop_item      = &config_desc_drop,
 750 };
 751
 752 static const struct config_item_type config_desc_type = {
 753         .ct_group_ops   = &config_desc_ops,
 754         .ct_owner       = THIS_MODULE,
 755 };
 756
 757 GS_STRINGS_RW(gadget_strings, manufacturer);
 758 GS_STRINGS_RW(gadget_strings, product);
 759 GS_STRINGS_RW(gadget_strings, serialnumber);
 760
 761 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
 762         &gadget_strings_attr_manufacturer,
 763         &gadget_strings_attr_product,
 764         &gadget_strings_attr_serialnumber,
 765         NULL,
 766 };
 767
 768 static void gadget_strings_attr_release(struct config_item *item)
 769 {
 770         struct gadget_strings *gs = to_gadget_strings(item);
 771
 772         kfree(gs->manufacturer);
 773         kfree(gs->product);
 774         kfree(gs->serialnumber);
 775
 776         list_del(&gs->list);
 777         kfree(gs);
 778 }
 779
 780 USB_CONFIG_STRING_RW_OPS(gadget_strings);
 781 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
 782
 783 static inline struct gadget_info *os_desc_item_to_gadget_info(
 784                 struct config_item *item)
 785 {
 786         return container_of(to_config_group(item),
 787                         struct gadget_info, os_desc_group);
 788 }
 789
 790 static ssize_t os_desc_use_show(struct config_item *item, char *page)
 791 {
 792         return sprintf(page, "%d\n",
 793                         os_desc_item_to_gadget_info(item)->use_os_desc);
 794 }
 795
 796 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
 797                                  size_t len)
 798 {
 799         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 800         int ret;
 801         bool use;
 802
 803         mutex_lock(&gi->lock);
 804         ret = kstrtobool(page, &use);
 805         if (!ret) {
 806                 gi->use_os_desc = use;
 807                 ret = len;
 808         }
 809         mutex_unlock(&gi->lock);
 810
 811         return ret;
 812 }
 813
 814 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
 815 {
 816         return sprintf(page, "0x%02x\n",
 817                         os_desc_item_to_gadget_info(item)->b_vendor_code);
 818 }
 819
 820 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
 821                                            const char *page, size_t len)
 822 {
 823         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 824         int ret;
 825         u8 b_vendor_code;
 826
 827         mutex_lock(&gi->lock);
 828         ret = kstrtou8(page, 0, &b_vendor_code);
 829         if (!ret) {
 830                 gi->b_vendor_code = b_vendor_code;
 831                 ret = len;
 832         }
 833         mutex_unlock(&gi->lock);
 834
 835         return ret;
 836 }
 837
 838 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
 839 {
 840         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 841         int res;
 842
 843         res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
 844                               UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
 845         page[res++] = '\n';
 846
 847         return res;
 848 }
 849
 850 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
 851                                      size_t len)
 852 {
 853         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 854         int res, l;
 855
 856         l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
 857         if (page[l - 1] == '\n')
 858                 --l;
 859
 860         mutex_lock(&gi->lock);
 861         res = utf8s_to_utf16s(page, l,
 862                               UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
 863                               OS_STRING_QW_SIGN_LEN);
 864         if (res > 0)
 865                 res = len;
 866         mutex_unlock(&gi->lock);
 867
 868         return res;
 869 }
 870
 871 CONFIGFS_ATTR(os_desc_, use);
 872 CONFIGFS_ATTR(os_desc_, b_vendor_code);
 873 CONFIGFS_ATTR(os_desc_, qw_sign);
 874
 875 static struct configfs_attribute *os_desc_attrs[] = {
 876         &os_desc_attr_use,
 877         &os_desc_attr_b_vendor_code,
 878         &os_desc_attr_qw_sign,
 879         NULL,
 880 };
 881
 882 static int os_desc_link(struct config_item *os_desc_ci,
 883                         struct config_item *usb_cfg_ci)
 884 {
 885         struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
 886         struct usb_composite_dev *cdev = &gi->cdev;
 887         struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci);
 888         struct usb_configuration *c = NULL, *iter;
 889         int ret;
 890
 891         mutex_lock(&gi->lock);
 892         list_for_each_entry(iter, &cdev->configs, list) {
 893                 if (iter != &c_target->c)
 894                         continue;
 895                 c = iter;
 896                 break;
 897         }
 898         if (!c) {
 899                 ret = -EINVAL;
 900                 goto out;
 901         }
 902
 903         if (cdev->os_desc_config) {
 904                 ret = -EBUSY;
 905                 goto out;
 906         }
 907
 908         cdev->os_desc_config = &c_target->c;
 909         ret = 0;
 910
 911 out:
 912         mutex_unlock(&gi->lock);
 913         return ret;
 914 }
 915
 916 static void os_desc_unlink(struct config_item *os_desc_ci,
 917                           struct config_item *usb_cfg_ci)
 918 {
 919         struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
 920         struct usb_composite_dev *cdev = &gi->cdev;
 921
 922         mutex_lock(&gi->lock);
 923         if (gi->composite.gadget_driver.udc_name)
 924                 unregister_gadget(gi);
 925         cdev->os_desc_config = NULL;
 926         WARN_ON(gi->composite.gadget_driver.udc_name);
 927         mutex_unlock(&gi->lock);
 928 }
 929
 930 static struct configfs_item_operations os_desc_ops = {
 931         .allow_link             = os_desc_link,
 932         .drop_link              = os_desc_unlink,
 933 };
 934
 935 static struct config_item_type os_desc_type = {
 936         .ct_item_ops    = &os_desc_ops,
 937         .ct_attrs       = os_desc_attrs,
 938         .ct_owner       = THIS_MODULE,
 939 };
 940
 941 static inline struct usb_os_desc_ext_prop
 942 *to_usb_os_desc_ext_prop(struct config_item *item)
 943 {
 944         return container_of(item, struct usb_os_desc_ext_prop, item);
 945 }
 946
 947 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
 948 {
 949         return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
 950 }
 951
 952 static ssize_t ext_prop_type_store(struct config_item *item,
 953                                    const char *page, size_t len)
 954 {
 955         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
 956         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
 957         u8 type;
 958         int ret;
 959
 960         if (desc->opts_mutex)
 961                 mutex_lock(desc->opts_mutex);
 962         ret = kstrtou8(page, 0, &type);
 963         if (ret)
 964                 goto end;
 965         if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
 966                 ret = -EINVAL;
 967                 goto end;
 968         }
 969
 970         if ((ext_prop->type == USB_EXT_PROP_BINARY ||
 971             ext_prop->type == USB_EXT_PROP_LE32 ||
 972             ext_prop->type == USB_EXT_PROP_BE32) &&
 973             (type == USB_EXT_PROP_UNICODE ||
 974             type == USB_EXT_PROP_UNICODE_ENV ||
 975             type == USB_EXT_PROP_UNICODE_LINK))
 976                 ext_prop->data_len <<= 1;
 977         else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
 978                    ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
 979                    ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
 980                    (type == USB_EXT_PROP_BINARY ||
 981                    type == USB_EXT_PROP_LE32 ||
 982                    type == USB_EXT_PROP_BE32))
 983                 ext_prop->data_len >>= 1;
 984         ext_prop->type = type;
 985         ret = len;
 986
 987 end:
 988         if (desc->opts_mutex)
 989                 mutex_unlock(desc->opts_mutex);
 990         return ret;
 991 }
 992
 993 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
 994 {
 995         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
 996         int len = ext_prop->data_len;
 997
 998         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
 999             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1000             ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1001                 len >>= 1;
1002         memcpy(page, ext_prop->data, len);
1003
1004         return len;
1005 }
1006
1007 static ssize_t ext_prop_data_store(struct config_item *item,
1008                                    const char *page, size_t len)
1009 {
1010         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1011         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1012         char *new_data;
1013         size_t ret_len = len;
1014
1015         if (page[len - 1] == '\n' || page[len - 1] == '\0')
1016                 --len;
1017         new_data = kmemdup(page, len, GFP_KERNEL);
1018         if (!new_data)
1019                 return -ENOMEM;
1020
1021         if (desc->opts_mutex)
1022                 mutex_lock(desc->opts_mutex);
1023         kfree(ext_prop->data);
1024         ext_prop->data = new_data;
1025         desc->ext_prop_len -= ext_prop->data_len;
1026         ext_prop->data_len = len;
1027         desc->ext_prop_len += ext_prop->data_len;
1028         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1029             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1030             ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1031                 desc->ext_prop_len -= ext_prop->data_len;
1032                 ext_prop->data_len <<= 1;
1033                 ext_prop->data_len += 2;
1034                 desc->ext_prop_len += ext_prop->data_len;
1035         }
1036         if (desc->opts_mutex)
1037                 mutex_unlock(desc->opts_mutex);
1038         return ret_len;
1039 }
1040
1041 CONFIGFS_ATTR(ext_prop_, type);
1042 CONFIGFS_ATTR(ext_prop_, data);
1043
1044 static struct configfs_attribute *ext_prop_attrs[] = {
1045         &ext_prop_attr_type,
1046         &ext_prop_attr_data,
1047         NULL,
1048 };
1049
1050 static void usb_os_desc_ext_prop_release(struct config_item *item)
1051 {
1052         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1053
1054         kfree(ext_prop); /* frees a whole chunk */
1055 }
1056
1057 static struct configfs_item_operations ext_prop_ops = {
1058         .release                = usb_os_desc_ext_prop_release,
1059 };
1060
1061 static struct config_item *ext_prop_make(
1062                 struct config_group *group,
1063                 const char *name)
1064 {
1065         struct usb_os_desc_ext_prop *ext_prop;
1066         struct config_item_type *ext_prop_type;
1067         struct usb_os_desc *desc;
1068         char *vlabuf;
1069
1070         vla_group(data_chunk);
1071         vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1072         vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1073
1074         vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1075         if (!vlabuf)
1076                 return ERR_PTR(-ENOMEM);
1077
1078         ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1079         ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1080
1081         desc = container_of(group, struct usb_os_desc, group);
1082         ext_prop_type->ct_item_ops = &ext_prop_ops;
1083         ext_prop_type->ct_attrs = ext_prop_attrs;
1084         ext_prop_type->ct_owner = desc->owner;
1085
1086         config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1087
1088         ext_prop->name = kstrdup(name, GFP_KERNEL);
1089         if (!ext_prop->name) {
1090                 kfree(vlabuf);
1091                 return ERR_PTR(-ENOMEM);
1092         }
1093         desc->ext_prop_len += 14;
1094         ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1095         if (desc->opts_mutex)
1096                 mutex_lock(desc->opts_mutex);
1097         desc->ext_prop_len += ext_prop->name_len;
1098         list_add_tail(&ext_prop->entry, &desc->ext_prop);
1099         ++desc->ext_prop_count;
1100         if (desc->opts_mutex)
1101                 mutex_unlock(desc->opts_mutex);
1102
1103         return &ext_prop->item;
1104 }
1105
1106 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1107 {
1108         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1109         struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1110
1111         if (desc->opts_mutex)
1112                 mutex_lock(desc->opts_mutex);
1113         list_del(&ext_prop->entry);
1114         --desc->ext_prop_count;
1115         kfree(ext_prop->name);
1116         desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1117         if (desc->opts_mutex)
1118                 mutex_unlock(desc->opts_mutex);
1119         config_item_put(item);
1120 }
1121
1122 static struct configfs_group_operations interf_grp_ops = {
1123         .make_item      = &ext_prop_make,
1124         .drop_item      = &ext_prop_drop,
1125 };
1126
1127 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1128                                              char *page)
1129 {
1130         memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1131         return 8;
1132 }
1133
1134 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1135                                               const char *page, size_t len)
1136 {
1137         struct usb_os_desc *desc = to_usb_os_desc(item);
1138         int l;
1139
1140         l = min_t(int, 8, len);
1141         if (page[l - 1] == '\n')
1142                 --l;
1143         if (desc->opts_mutex)
1144                 mutex_lock(desc->opts_mutex);
1145         memcpy(desc->ext_compat_id, page, l);
1146
1147         if (desc->opts_mutex)
1148                 mutex_unlock(desc->opts_mutex);
1149
1150         return len;
1151 }
1152
1153 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1154                                                  char *page)
1155 {
1156         memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1157         return 8;
1158 }
1159
1160 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1161                                                   const char *page, size_t len)
1162 {
1163         struct usb_os_desc *desc = to_usb_os_desc(item);
1164         int l;
1165
1166         l = min_t(int, 8, len);
1167         if (page[l - 1] == '\n')
1168                 --l;
1169         if (desc->opts_mutex)
1170                 mutex_lock(desc->opts_mutex);
1171         memcpy(desc->ext_compat_id + 8, page, l);
1172
1173         if (desc->opts_mutex)
1174                 mutex_unlock(desc->opts_mutex);
1175
1176         return len;
1177 }
1178
1179 CONFIGFS_ATTR(interf_grp_, compatible_id);
1180 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1181
1182 static struct configfs_attribute *interf_grp_attrs[] = {
1183         &interf_grp_attr_compatible_id,
1184         &interf_grp_attr_sub_compatible_id,
1185         NULL
1186 };
1187
1188 struct config_group *usb_os_desc_prepare_interf_dir(
1189                 struct config_group *parent,
1190                 int n_interf,
1191                 struct usb_os_desc **desc,
1192                 char **names,
1193                 struct module *owner)
1194 {
1195         struct config_group *os_desc_group;
1196         struct config_item_type *os_desc_type, *interface_type;
1197
1198         vla_group(data_chunk);
1199         vla_item(data_chunk, struct config_group, os_desc_group, 1);
1200         vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1201         vla_item(data_chunk, struct config_item_type, interface_type, 1);
1202
1203         char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1204         if (!vlabuf)
1205                 return ERR_PTR(-ENOMEM);
1206
1207         os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1208         os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1209         interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1210
1211         os_desc_type->ct_owner = owner;
1212         config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1213         configfs_add_default_group(os_desc_group, parent);
1214
1215         interface_type->ct_group_ops = &interf_grp_ops;
1216         interface_type->ct_attrs = interf_grp_attrs;
1217         interface_type->ct_owner = owner;
1218
1219         while (n_interf--) {
1220                 struct usb_os_desc *d;
1221
1222                 d = desc[n_interf];
1223                 d->owner = owner;
1224                 config_group_init_type_name(&d->group, "", interface_type);
1225                 config_item_set_name(&d->group.cg_item, "interface.%s",
1226                                      names[n_interf]);
1227                 configfs_add_default_group(&d->group, os_desc_group);
1228         }
1229
1230         return os_desc_group;
1231 }
1232 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1233
1234 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1235 {
1236         WARN_ON(1);
1237         return -EINVAL;
1238 }
1239
1240 int composite_dev_prepare(struct usb_composite_driver *composite,
1241                 struct usb_composite_dev *dev);
1242
1243 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1244                                   struct usb_ep *ep0);
1245
1246 static void purge_configs_funcs(struct gadget_info *gi)
1247 {
1248         struct usb_configuration        *c;
1249
1250         list_for_each_entry(c, &gi->cdev.configs, list) {
1251                 struct usb_function *f, *tmp;
1252                 struct config_usb_cfg *cfg;
1253
1254                 cfg = container_of(c, struct config_usb_cfg, c);
1255
1256                 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1257
1258                         list_move(&f->list, &cfg->func_list);
1259                         if (f->unbind) {
1260                                 dev_dbg(&gi->cdev.gadget->dev,
1261                                         "unbind function '%s'/%p\n",
1262                                         f->name, f);
1263                                 f->unbind(c, f);
1264                         }
1265                 }
1266                 c->next_interface_id = 0;
1267                 memset(c->interface, 0, sizeof(c->interface));
1268                 c->superspeed_plus = 0;
1269                 c->superspeed = 0;
1270                 c->highspeed = 0;
1271                 c->fullspeed = 0;
1272         }
1273 }
1274
1275 static int configfs_composite_bind(struct usb_gadget *gadget,
1276                 struct usb_gadget_driver *gdriver)
1277 {
1278         struct usb_composite_driver     *composite = to_cdriver(gdriver);
1279         struct gadget_info              *gi = container_of(composite,
1280                                                 struct gadget_info, composite);
1281         struct usb_composite_dev        *cdev = &gi->cdev;
1282         struct usb_configuration        *c;
1283         struct usb_string               *s;
1284         unsigned                        i;
1285         int                             ret;
1286
1287         /* the gi->lock is hold by the caller */
1288         gi->unbind = 0;
1289         cdev->gadget = gadget;
1290         set_gadget_data(gadget, cdev);
1291         ret = composite_dev_prepare(composite, cdev);
1292         if (ret)
1293                 return ret;
1294         /* and now the gadget bind */
1295         ret = -EINVAL;
1296
1297         if (list_empty(&gi->cdev.configs)) {
1298                 pr_err("Need at least one configuration in %s.\n",
1299                                 gi->composite.name);
1300                 goto err_comp_cleanup;
1301         }
1302
1303
1304         list_for_each_entry(c, &gi->cdev.configs, list) {
1305                 struct config_usb_cfg *cfg;
1306
1307                 cfg = container_of(c, struct config_usb_cfg, c);
1308                 if (list_empty(&cfg->func_list)) {
1309                         pr_err("Config %s/%d of %s needs at least one function.\n",
1310                               c->label, c->bConfigurationValue,
1311                               gi->composite.name);
1312                         goto err_comp_cleanup;
1313                 }
1314         }
1315
1316         /* init all strings */
1317         if (!list_empty(&gi->string_list)) {
1318                 struct gadget_strings *gs;
1319
1320                 i = 0;
1321                 list_for_each_entry(gs, &gi->string_list, list) {
1322
1323                         gi->gstrings[i] = &gs->stringtab_dev;
1324                         gs->stringtab_dev.strings = gs->strings;
1325                         gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1326                                 gs->manufacturer;
1327                         gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1328                         gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1329                         i++;
1330                 }
1331                 gi->gstrings[i] = NULL;
1332                 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1333                                 USB_GADGET_FIRST_AVAIL_IDX);
1334                 if (IS_ERR(s)) {
1335                         ret = PTR_ERR(s);
1336                         goto err_comp_cleanup;
1337                 }
1338
1339                 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1340                 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1341                 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1342         }
1343
1344         if (gi->use_os_desc) {
1345                 cdev->use_os_string = true;
1346                 cdev->b_vendor_code = gi->b_vendor_code;
1347                 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1348         }
1349
1350         if (gadget_is_otg(gadget) && !otg_desc[0]) {
1351                 struct usb_descriptor_header *usb_desc;
1352
1353                 usb_desc = usb_otg_descriptor_alloc(gadget);
1354                 if (!usb_desc) {
1355                         ret = -ENOMEM;
1356                         goto err_comp_cleanup;
1357                 }
1358                 usb_otg_descriptor_init(gadget, usb_desc);
1359                 otg_desc[0] = usb_desc;
1360                 otg_desc[1] = NULL;
1361         }
1362
1363         /* Go through all configs, attach all functions */
1364         list_for_each_entry(c, &gi->cdev.configs, list) {
1365                 struct config_usb_cfg *cfg;
1366                 struct usb_function *f;
1367                 struct usb_function *tmp;
1368                 struct gadget_config_name *cn;
1369
1370                 if (gadget_is_otg(gadget))
1371                         c->descriptors = otg_desc;
1372
1373                 cfg = container_of(c, struct config_usb_cfg, c);
1374                 if (!list_empty(&cfg->string_list)) {
1375                         i = 0;
1376                         list_for_each_entry(cn, &cfg->string_list, list) {
1377                                 cfg->gstrings[i] = &cn->stringtab_dev;
1378                                 cn->stringtab_dev.strings = &cn->strings;
1379                                 cn->strings.s = cn->configuration;
1380                                 i++;
1381                         }
1382                         cfg->gstrings[i] = NULL;
1383                         s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1384                         if (IS_ERR(s)) {
1385                                 ret = PTR_ERR(s);
1386                                 goto err_comp_cleanup;
1387                         }
1388                         c->iConfiguration = s[0].id;
1389                 }
1390
1391                 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1392                         list_del(&f->list);
1393                         ret = usb_add_function(c, f);
1394                         if (ret) {
1395                                 list_add(&f->list, &cfg->func_list);
1396                                 goto err_purge_funcs;
1397                         }
1398                 }
1399                 ret = usb_gadget_check_config(cdev->gadget);
1400                 if (ret)
1401                         goto err_purge_funcs;
1402
1403                 usb_ep_autoconfig_reset(cdev->gadget);
1404         }
1405         if (cdev->use_os_string) {
1406                 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1407                 if (ret)
1408                         goto err_purge_funcs;
1409         }
1410
1411         usb_ep_autoconfig_reset(cdev->gadget);
1412         return 0;
1413
1414 err_purge_funcs:
1415         purge_configs_funcs(gi);
1416 err_comp_cleanup:
1417         composite_dev_cleanup(cdev);
1418         return ret;
1419 }
1420
1421 static void configfs_composite_unbind(struct usb_gadget *gadget)
1422 {
1423         struct usb_composite_dev        *cdev;
1424         struct gadget_info              *gi;
1425         unsigned long flags;
1426
1427         /* the gi->lock is hold by the caller */
1428
1429         cdev = get_gadget_data(gadget);
1430         gi = container_of(cdev, struct gadget_info, cdev);
1431         spin_lock_irqsave(&gi->spinlock, flags);
1432         gi->unbind = 1;
1433         spin_unlock_irqrestore(&gi->spinlock, flags);
1434
1435         kfree(otg_desc[0]);
1436         otg_desc[0] = NULL;
1437         purge_configs_funcs(gi);
1438         composite_dev_cleanup(cdev);
1439         usb_ep_autoconfig_reset(cdev->gadget);
1440         spin_lock_irqsave(&gi->spinlock, flags);
1441         cdev->gadget = NULL;
1442         cdev->deactivations = 0;
1443         gadget->deactivated = false;
1444         set_gadget_data(gadget, NULL);
1445         spin_unlock_irqrestore(&gi->spinlock, flags);
1446 }
1447
1448 static int configfs_composite_setup(struct usb_gadget *gadget,
1449                 const struct usb_ctrlrequest *ctrl)
1450 {
1451         struct usb_composite_dev *cdev;
1452         struct gadget_info *gi;
1453         unsigned long flags;
1454         int ret;
1455
1456         cdev = get_gadget_data(gadget);
1457         if (!cdev)
1458                 return 0;
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 0;
1466         }
1467
1468         ret = composite_setup(gadget, ctrl);
1469         spin_unlock_irqrestore(&gi->spinlock, flags);
1470         return ret;
1471 }
1472
1473 static void configfs_composite_disconnect(struct usb_gadget *gadget)
1474 {
1475         struct usb_composite_dev *cdev;
1476         struct gadget_info *gi;
1477         unsigned long flags;
1478
1479         cdev = get_gadget_data(gadget);
1480         if (!cdev)
1481                 return;
1482
1483         gi = container_of(cdev, struct gadget_info, cdev);
1484         spin_lock_irqsave(&gi->spinlock, flags);
1485         cdev = get_gadget_data(gadget);
1486         if (!cdev || gi->unbind) {
1487                 spin_unlock_irqrestore(&gi->spinlock, flags);
1488                 return;
1489         }
1490
1491         composite_disconnect(gadget);
1492         spin_unlock_irqrestore(&gi->spinlock, flags);
1493 }
1494
1495 static void configfs_composite_reset(struct usb_gadget *gadget)
1496 {
1497         struct usb_composite_dev *cdev;
1498         struct gadget_info *gi;
1499         unsigned long flags;
1500
1501         cdev = get_gadget_data(gadget);
1502         if (!cdev)
1503                 return;
1504
1505         gi = container_of(cdev, struct gadget_info, cdev);
1506         spin_lock_irqsave(&gi->spinlock, flags);
1507         cdev = get_gadget_data(gadget);
1508         if (!cdev || gi->unbind) {
1509                 spin_unlock_irqrestore(&gi->spinlock, flags);
1510                 return;
1511         }
1512
1513         composite_reset(gadget);
1514         spin_unlock_irqrestore(&gi->spinlock, flags);
1515 }
1516
1517 static void configfs_composite_suspend(struct usb_gadget *gadget)
1518 {
1519         struct usb_composite_dev *cdev;
1520         struct gadget_info *gi;
1521         unsigned long flags;
1522
1523         cdev = get_gadget_data(gadget);
1524         if (!cdev)
1525                 return;
1526
1527         gi = container_of(cdev, struct gadget_info, cdev);
1528         spin_lock_irqsave(&gi->spinlock, flags);
1529         cdev = get_gadget_data(gadget);
1530         if (!cdev || gi->unbind) {
1531                 spin_unlock_irqrestore(&gi->spinlock, flags);
1532                 return;
1533         }
1534
1535         composite_suspend(gadget);
1536         spin_unlock_irqrestore(&gi->spinlock, flags);
1537 }
1538
1539 static void configfs_composite_resume(struct usb_gadget *gadget)
1540 {
1541         struct usb_composite_dev *cdev;
1542         struct gadget_info *gi;
1543         unsigned long flags;
1544
1545         cdev = get_gadget_data(gadget);
1546         if (!cdev)
1547                 return;
1548
1549         gi = container_of(cdev, struct gadget_info, cdev);
1550         spin_lock_irqsave(&gi->spinlock, flags);
1551         cdev = get_gadget_data(gadget);
1552         if (!cdev || gi->unbind) {
1553                 spin_unlock_irqrestore(&gi->spinlock, flags);
1554                 return;
1555         }
1556
1557         composite_resume(gadget);
1558         spin_unlock_irqrestore(&gi->spinlock, flags);
1559 }
1560
1561 static const struct usb_gadget_driver configfs_driver_template = {
1562         .bind           = configfs_composite_bind,
1563         .unbind         = configfs_composite_unbind,
1564
1565         .setup          = configfs_composite_setup,
1566         .reset          = configfs_composite_reset,
1567         .disconnect     = configfs_composite_disconnect,
1568
1569         .suspend        = configfs_composite_suspend,
1570         .resume         = configfs_composite_resume,
1571
1572         .max_speed      = USB_SPEED_SUPER_PLUS,
1573         .driver = {
1574                 .owner          = THIS_MODULE,
1575                 .name           = "configfs-gadget",
1576         },
1577         .match_existing_only = 1,
1578 };
1579
1580 static struct config_group *gadgets_make(
1581                 struct config_group *group,
1582                 const char *name)
1583 {
1584         struct gadget_info *gi;
1585
1586         gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1587         if (!gi)
1588                 return ERR_PTR(-ENOMEM);
1589
1590         config_group_init_type_name(&gi->group, name, &gadget_root_type);
1591
1592         config_group_init_type_name(&gi->functions_group, "functions",
1593                         &functions_type);
1594         configfs_add_default_group(&gi->functions_group, &gi->group);
1595
1596         config_group_init_type_name(&gi->configs_group, "configs",
1597                         &config_desc_type);
1598         configfs_add_default_group(&gi->configs_group, &gi->group);
1599
1600         config_group_init_type_name(&gi->strings_group, "strings",
1601                         &gadget_strings_strings_type);
1602         configfs_add_default_group(&gi->strings_group, &gi->group);
1603
1604         config_group_init_type_name(&gi->os_desc_group, "os_desc",
1605                         &os_desc_type);
1606         configfs_add_default_group(&gi->os_desc_group, &gi->group);
1607
1608         gi->composite.bind = configfs_do_nothing;
1609         gi->composite.unbind = configfs_do_nothing;
1610         gi->composite.suspend = NULL;
1611         gi->composite.resume = NULL;
1612         gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
1613
1614         spin_lock_init(&gi->spinlock);
1615         mutex_init(&gi->lock);
1616         INIT_LIST_HEAD(&gi->string_list);
1617         INIT_LIST_HEAD(&gi->available_func);
1618
1619         composite_init_dev(&gi->cdev);
1620         gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1621         gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1622         gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1623
1624         gi->composite.gadget_driver = configfs_driver_template;
1625
1626         gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1627         gi->composite.name = gi->composite.gadget_driver.function;
1628
1629         if (!gi->composite.gadget_driver.function)
1630                 goto err;
1631
1632         return &gi->group;
1633 err:
1634         kfree(gi);
1635         return ERR_PTR(-ENOMEM);
1636 }
1637
1638 static void gadgets_drop(struct config_group *group, struct config_item *item)
1639 {
1640         config_item_put(item);
1641 }
1642
1643 static struct configfs_group_operations gadgets_ops = {
1644         .make_group     = &gadgets_make,
1645         .drop_item      = &gadgets_drop,
1646 };
1647
1648 static const struct config_item_type gadgets_type = {
1649         .ct_group_ops   = &gadgets_ops,
1650         .ct_owner       = THIS_MODULE,
1651 };
1652
1653 static struct configfs_subsystem gadget_subsys = {
1654         .su_group = {
1655                 .cg_item = {
1656                         .ci_namebuf = "usb_gadget",
1657                         .ci_type = &gadgets_type,
1658                 },
1659         },
1660         .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1661 };
1662
1663 void unregister_gadget_item(struct config_item *item)
1664 {
1665         struct gadget_info *gi = to_gadget_info(item);
1666
1667         mutex_lock(&gi->lock);
1668         unregister_gadget(gi);
1669         mutex_unlock(&gi->lock);
1670 }
1671 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1672
1673 static int __init gadget_cfs_init(void)
1674 {
1675         int ret;
1676
1677         config_group_init(&gadget_subsys.su_group);
1678
1679         ret = configfs_register_subsystem(&gadget_subsys);
1680         return ret;
1681 }
1682 module_init(gadget_cfs_init);
1683
1684 static void __exit gadget_cfs_exit(void)
1685 {
1686         configfs_unregister_subsystem(&gadget_subsys);
1687 }
1688 module_exit(gadget_cfs_exit);