drivers/usb/gadget/configfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/configfs.h>
   3 #include <linux/module.h>
   4 #include <linux/slab.h>
   5 #include <linux/device.h>
   6 #include <linux/nls.h>
   7 #include <linux/usb/composite.h>
   8 #include <linux/usb/gadget_configfs.h>
   9 #include "configfs.h"
  10 #include "u_f.h"
  11 #include "u_os_desc.h"
  12
  13 int check_user_usb_string(const char *name,
  14                 struct usb_gadget_strings *stringtab_dev)
  15 {
  16         u16 num;
  17         int ret;
  18
  19         ret = kstrtou16(name, 0, &num);
  20         if (ret)
  21                 return ret;
  22
  23         if (!usb_validate_langid(num))
  24                 return -EINVAL;
  25
  26         stringtab_dev->language = num;
  27         return 0;
  28 }
  29
  30 #define MAX_NAME_LEN    40
  31 #define MAX_USB_STRING_LANGS 2
  32
  33 static const struct usb_descriptor_header *otg_desc[2];
  34
  35 struct gadget_info {
  36         struct config_group group;
  37         struct config_group functions_group;
  38         struct config_group configs_group;
  39         struct config_group strings_group;
  40         struct config_group os_desc_group;
  41
  42         struct mutex lock;
  43         struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
  44         struct list_head string_list;
  45         struct list_head available_func;
  46
  47         struct usb_composite_driver composite;
  48         struct usb_composite_dev cdev;
  49         bool use_os_desc;
  50         char b_vendor_code;
  51         char qw_sign[OS_STRING_QW_SIGN_LEN];
  52         spinlock_t spinlock;
  53         bool unbind;
  54 };
  55
  56 static inline struct gadget_info *to_gadget_info(struct config_item *item)
  57 {
  58          return container_of(to_config_group(item), struct gadget_info, group);
  59 }
  60
  61 struct config_usb_cfg {
  62         struct config_group group;
  63         struct config_group strings_group;
  64         struct list_head string_list;
  65         struct usb_configuration c;
  66         struct list_head func_list;
  67         struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
  68 };
  69
  70 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
  71 {
  72         return container_of(to_config_group(item), struct config_usb_cfg,
  73                         group);
  74 }
  75
  76 struct gadget_strings {
  77         struct usb_gadget_strings stringtab_dev;
  78         struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
  79         char *manufacturer;
  80         char *product;
  81         char *serialnumber;
  82
  83         struct config_group group;
  84         struct list_head list;
  85 };
  86
  87 struct os_desc {
  88         struct config_group group;
  89 };
  90
  91 struct gadget_config_name {
  92         struct usb_gadget_strings stringtab_dev;
  93         struct usb_string strings;
  94         char *configuration;
  95
  96         struct config_group group;
  97         struct list_head list;
  98 };
  99
 100 #define USB_MAX_STRING_WITH_NULL_LEN    (USB_MAX_STRING_LEN+1)
 101
 102 static int usb_string_copy(const char *s, char **s_copy)
 103 {
 104         int ret;
 105         char *str;
 106         char *copy = *s_copy;
 107         ret = strlen(s);
 108         if (ret > USB_MAX_STRING_LEN)
 109                 return -EOVERFLOW;
 110
 111         if (copy) {
 112                 str = copy;
 113         } else {
 114                 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
 115                 if (!str)
 116                         return -ENOMEM;
 117         }
 118         strcpy(str, s);
 119         if (str[ret - 1] == '\n')
 120                 str[ret - 1] = '\0';
 121         *s_copy = str;
 122         return 0;
 123 }
 124
 125 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name)      \
 126 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
 127                         char *page)     \
 128 {       \
 129         return sprintf(page, "0x%02x\n", \
 130                 to_gadget_info(item)->cdev.desc.__name); \
 131 }
 132
 133 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name)     \
 134 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
 135                         char *page)     \
 136 {       \
 137         return sprintf(page, "0x%04x\n", \
 138                 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
 139 }
 140
 141
 142 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name)               \
 143 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 144                 const char *page, size_t len)           \
 145 {                                                       \
 146         u8 val;                                         \
 147         int ret;                                        \
 148         ret = kstrtou8(page, 0, &val);                  \
 149         if (ret)                                        \
 150                 return ret;                             \
 151         to_gadget_info(item)->cdev.desc._name = val;    \
 152         return len;                                     \
 153 }
 154
 155 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name)      \
 156 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 157                 const char *page, size_t len)           \
 158 {                                                       \
 159         u16 val;                                        \
 160         int ret;                                        \
 161         ret = kstrtou16(page, 0, &val);                 \
 162         if (ret)                                        \
 163                 return ret;                             \
 164         to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val);     \
 165         return len;                                     \
 166 }
 167
 168 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type)  \
 169         GI_DEVICE_DESC_SIMPLE_R_##_type(_name)  \
 170         GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
 171
 172 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
 173 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
 174 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
 175 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
 176 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
 177 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
 178 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
 179 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
 180
 181 static ssize_t is_valid_bcd(u16 bcd_val)
 182 {
 183         if ((bcd_val & 0xf) > 9)
 184                 return -EINVAL;
 185         if (((bcd_val >> 4) & 0xf) > 9)
 186                 return -EINVAL;
 187         if (((bcd_val >> 8) & 0xf) > 9)
 188                 return -EINVAL;
 189         if (((bcd_val >> 12) & 0xf) > 9)
 190                 return -EINVAL;
 191         return 0;
 192 }
 193
 194 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
 195                 const char *page, size_t len)
 196 {
 197         u16 bcdDevice;
 198         int ret;
 199
 200         ret = kstrtou16(page, 0, &bcdDevice);
 201         if (ret)
 202                 return ret;
 203         ret = is_valid_bcd(bcdDevice);
 204         if (ret)
 205                 return ret;
 206
 207         to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
 208         return len;
 209 }
 210
 211 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
 212                 const char *page, size_t len)
 213 {
 214         u16 bcdUSB;
 215         int ret;
 216
 217         ret = kstrtou16(page, 0, &bcdUSB);
 218         if (ret)
 219                 return ret;
 220         ret = is_valid_bcd(bcdUSB);
 221         if (ret)
 222                 return ret;
 223
 224         to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
 225         return len;
 226 }
 227
 228 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
 229 {
 230         struct gadget_info *gi = to_gadget_info(item);
 231         char *udc_name;
 232         int ret;
 233
 234         mutex_lock(&gi->lock);
 235         udc_name = gi->composite.gadget_driver.udc_name;
 236         ret = sprintf(page, "%s\n", udc_name ?: "");
 237         mutex_unlock(&gi->lock);
 238
 239         return ret;
 240 }
 241
 242 static int unregister_gadget(struct gadget_info *gi)
 243 {
 244         int ret;
 245
 246         if (!gi->composite.gadget_driver.udc_name)
 247                 return -ENODEV;
 248
 249         ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
 250         if (ret)
 251                 return ret;
 252         kfree(gi->composite.gadget_driver.udc_name);
 253         gi->composite.gadget_driver.udc_name = NULL;
 254         return 0;
 255 }
 256
 257 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
 258                 const char *page, size_t len)
 259 {
 260         struct gadget_info *gi = to_gadget_info(item);
 261         char *name;
 262         int ret;
 263
 264         if (strlen(page) < len)
 265                 return -EOVERFLOW;
 266
 267         name = kstrdup(page, GFP_KERNEL);
 268         if (!name)
 269                 return -ENOMEM;
 270         if (name[len - 1] == '\n')
 271                 name[len - 1] = '\0';
 272
 273         mutex_lock(&gi->lock);
 274
 275         if (!strlen(name)) {
 276                 ret = unregister_gadget(gi);
 277                 if (ret)
 278                         goto err;
 279                 kfree(name);
 280         } else {
 281                 if (gi->composite.gadget_driver.udc_name) {
 282                         ret = -EBUSY;
 283                         goto err;
 284                 }
 285                 gi->composite.gadget_driver.udc_name = name;
 286                 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
 287                 if (ret) {
 288                         gi->composite.gadget_driver.udc_name = NULL;
 289                         goto err;
 290                 }
 291         }
 292         mutex_unlock(&gi->lock);
 293         return len;
 294 err:
 295         kfree(name);
 296         mutex_unlock(&gi->lock);
 297         return ret;
 298 }
 299
 300 static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
 301                                               char *page)
 302 {
 303         enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
 304
 305         return sprintf(page, "%s\n", usb_speed_string(speed));
 306 }
 307
 308 static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
 309                                                const char *page, size_t len)
 310 {
 311         struct gadget_info *gi = to_gadget_info(item);
 312
 313         mutex_lock(&gi->lock);
 314
 315         /* Prevent changing of max_speed after the driver is binded */
 316         if (gi->composite.gadget_driver.udc_name)
 317                 goto err;
 318
 319         if (strncmp(page, "super-speed-plus", 16) == 0)
 320                 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
 321         else if (strncmp(page, "super-speed", 11) == 0)
 322                 gi->composite.max_speed = USB_SPEED_SUPER;
 323         else if (strncmp(page, "high-speed", 10) == 0)
 324                 gi->composite.max_speed = USB_SPEED_HIGH;
 325         else if (strncmp(page, "full-speed", 10) == 0)
 326                 gi->composite.max_speed = USB_SPEED_FULL;
 327         else if (strncmp(page, "low-speed", 9) == 0)
 328                 gi->composite.max_speed = USB_SPEED_LOW;
 329         else
 330                 goto err;
 331
 332         gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
 333
 334         mutex_unlock(&gi->lock);
 335         return len;
 336 err:
 337         mutex_unlock(&gi->lock);
 338         return -EINVAL;
 339 }
 340
 341 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
 342 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
 343 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
 344 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
 345 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
 346 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
 347 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
 348 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
 349 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
 350 CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
 351
 352 static struct configfs_attribute *gadget_root_attrs[] = {
 353         &gadget_dev_desc_attr_bDeviceClass,
 354         &gadget_dev_desc_attr_bDeviceSubClass,
 355         &gadget_dev_desc_attr_bDeviceProtocol,
 356         &gadget_dev_desc_attr_bMaxPacketSize0,
 357         &gadget_dev_desc_attr_idVendor,
 358         &gadget_dev_desc_attr_idProduct,
 359         &gadget_dev_desc_attr_bcdDevice,
 360         &gadget_dev_desc_attr_bcdUSB,
 361         &gadget_dev_desc_attr_UDC,
 362         &gadget_dev_desc_attr_max_speed,
 363         NULL,
 364 };
 365
 366 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
 367 {
 368          return container_of(to_config_group(item), struct gadget_strings,
 369                          group);
 370 }
 371
 372 static inline struct gadget_config_name *to_gadget_config_name(
 373                 struct config_item *item)
 374 {
 375          return container_of(to_config_group(item), struct gadget_config_name,
 376                          group);
 377 }
 378
 379 static inline struct usb_function_instance *to_usb_function_instance(
 380                 struct config_item *item)
 381 {
 382          return container_of(to_config_group(item),
 383                          struct usb_function_instance, group);
 384 }
 385
 386 static void gadget_info_attr_release(struct config_item *item)
 387 {
 388         struct gadget_info *gi = to_gadget_info(item);
 389
 390         WARN_ON(!list_empty(&gi->cdev.configs));
 391         WARN_ON(!list_empty(&gi->string_list));
 392         WARN_ON(!list_empty(&gi->available_func));
 393         kfree(gi->composite.gadget_driver.function);
 394         kfree(gi);
 395 }
 396
 397 static struct configfs_item_operations gadget_root_item_ops = {
 398         .release                = gadget_info_attr_release,
 399 };
 400
 401 static void gadget_config_attr_release(struct config_item *item)
 402 {
 403         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 404
 405         WARN_ON(!list_empty(&cfg->c.functions));
 406         list_del(&cfg->c.list);
 407         kfree(cfg->c.label);
 408         kfree(cfg);
 409 }
 410
 411 static int config_usb_cfg_link(
 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_instance *a_fi;
 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(a_fi, &gi->available_func, cfs_list) {
 433                 if (a_fi == fi)
 434                         break;
 435         }
 436         if (a_fi != fi) {
 437                 ret = -EINVAL;
 438                 goto out;
 439         }
 440
 441         list_for_each_entry(f, &cfg->func_list, list) {
 442                 if (f->fi == fi) {
 443                         ret = -EEXIST;
 444                         goto out;
 445                 }
 446         }
 447
 448         f = usb_get_function(fi);
 449         if (IS_ERR(f)) {
 450                 ret = PTR_ERR(f);
 451                 goto out;
 452         }
 453
 454         /* stash the function until we bind it to the gadget */
 455         list_add_tail(&f->list, &cfg->func_list);
 456         ret = 0;
 457 out:
 458         mutex_unlock(&gi->lock);
 459         return ret;
 460 }
 461
 462 static void config_usb_cfg_unlink(
 463         struct config_item *usb_cfg_ci,
 464         struct config_item *usb_func_ci)
 465 {
 466         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 467         struct usb_composite_dev *cdev = cfg->c.cdev;
 468         struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
 469
 470         struct config_group *group = to_config_group(usb_func_ci);
 471         struct usb_function_instance *fi = container_of(group,
 472                         struct usb_function_instance, group);
 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         return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
 509 }
 510
 511 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
 512                 const char *page, size_t len)
 513 {
 514         u16 val;
 515         int ret;
 516         ret = kstrtou16(page, 0, &val);
 517         if (ret)
 518                 return ret;
 519         if (DIV_ROUND_UP(val, 8) > 0xff)
 520                 return -ERANGE;
 521         to_config_usb_cfg(item)->c.MaxPower = val;
 522         return len;
 523 }
 524
 525 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
 526                 char *page)
 527 {
 528         return sprintf(page, "0x%02x\n",
 529                 to_config_usb_cfg(item)->c.bmAttributes);
 530 }
 531
 532 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
 533                 const char *page, size_t len)
 534 {
 535         u8 val;
 536         int ret;
 537         ret = kstrtou8(page, 0, &val);
 538         if (ret)
 539                 return ret;
 540         if (!(val & USB_CONFIG_ATT_ONE))
 541                 return -EINVAL;
 542         if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
 543                                 USB_CONFIG_ATT_WAKEUP))
 544                 return -EINVAL;
 545         to_config_usb_cfg(item)->c.bmAttributes = val;
 546         return len;
 547 }
 548
 549 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
 550 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
 551
 552 static struct configfs_attribute *gadget_config_attrs[] = {
 553         &gadget_config_desc_attr_MaxPower,
 554         &gadget_config_desc_attr_bmAttributes,
 555         NULL,
 556 };
 557
 558 static const struct config_item_type gadget_config_type = {
 559         .ct_item_ops    = &gadget_config_item_ops,
 560         .ct_attrs       = gadget_config_attrs,
 561         .ct_owner       = THIS_MODULE,
 562 };
 563
 564 static const struct config_item_type gadget_root_type = {
 565         .ct_item_ops    = &gadget_root_item_ops,
 566         .ct_attrs       = gadget_root_attrs,
 567         .ct_owner       = THIS_MODULE,
 568 };
 569
 570 static void composite_init_dev(struct usb_composite_dev *cdev)
 571 {
 572         spin_lock_init(&cdev->lock);
 573         INIT_LIST_HEAD(&cdev->configs);
 574         INIT_LIST_HEAD(&cdev->gstrings);
 575 }
 576
 577 static struct config_group *function_make(
 578                 struct config_group *group,
 579                 const char *name)
 580 {
 581         struct gadget_info *gi;
 582         struct usb_function_instance *fi;
 583         char buf[MAX_NAME_LEN];
 584         char *func_name;
 585         char *instance_name;
 586         int ret;
 587
 588         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
 589         if (ret >= MAX_NAME_LEN)
 590                 return ERR_PTR(-ENAMETOOLONG);
 591
 592         func_name = buf;
 593         instance_name = strchr(func_name, '.');
 594         if (!instance_name) {
 595                 pr_err("Unable to locate . in FUNC.INSTANCE\n");
 596                 return ERR_PTR(-EINVAL);
 597         }
 598         *instance_name = '\0';
 599         instance_name++;
 600
 601         fi = usb_get_function_instance(func_name);
 602         if (IS_ERR(fi))
 603                 return ERR_CAST(fi);
 604
 605         ret = config_item_set_name(&fi->group.cg_item, "%s", name);
 606         if (ret) {
 607                 usb_put_function_instance(fi);
 608                 return ERR_PTR(ret);
 609         }
 610         if (fi->set_inst_name) {
 611                 ret = fi->set_inst_name(fi, instance_name);
 612                 if (ret) {
 613                         usb_put_function_instance(fi);
 614                         return ERR_PTR(ret);
 615                 }
 616         }
 617
 618         gi = container_of(group, struct gadget_info, functions_group);
 619
 620         mutex_lock(&gi->lock);
 621         list_add_tail(&fi->cfs_list, &gi->available_func);
 622         mutex_unlock(&gi->lock);
 623         return &fi->group;
 624 }
 625
 626 static void function_drop(
 627                 struct config_group *group,
 628                 struct config_item *item)
 629 {
 630         struct usb_function_instance *fi = to_usb_function_instance(item);
 631         struct gadget_info *gi;
 632
 633         gi = container_of(group, struct gadget_info, functions_group);
 634
 635         mutex_lock(&gi->lock);
 636         list_del(&fi->cfs_list);
 637         mutex_unlock(&gi->lock);
 638         config_item_put(item);
 639 }
 640
 641 static struct configfs_group_operations functions_ops = {
 642         .make_group     = &function_make,
 643         .drop_item      = &function_drop,
 644 };
 645
 646 static const struct config_item_type functions_type = {
 647         .ct_group_ops   = &functions_ops,
 648         .ct_owner       = THIS_MODULE,
 649 };
 650
 651 GS_STRINGS_RW(gadget_config_name, configuration);
 652
 653 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
 654         &gadget_config_name_attr_configuration,
 655         NULL,
 656 };
 657
 658 static void gadget_config_name_attr_release(struct config_item *item)
 659 {
 660         struct gadget_config_name *cn = to_gadget_config_name(item);
 661
 662         kfree(cn->configuration);
 663
 664         list_del(&cn->list);
 665         kfree(cn);
 666 }
 667
 668 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
 669 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
 670
 671 static struct config_group *config_desc_make(
 672                 struct config_group *group,
 673                 const char *name)
 674 {
 675         struct gadget_info *gi;
 676         struct config_usb_cfg *cfg;
 677         char buf[MAX_NAME_LEN];
 678         char *num_str;
 679         u8 num;
 680         int ret;
 681
 682         gi = container_of(group, struct gadget_info, configs_group);
 683         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
 684         if (ret >= MAX_NAME_LEN)
 685                 return ERR_PTR(-ENAMETOOLONG);
 686
 687         num_str = strchr(buf, '.');
 688         if (!num_str) {
 689                 pr_err("Unable to locate . in name.bConfigurationValue\n");
 690                 return ERR_PTR(-EINVAL);
 691         }
 692
 693         *num_str = '\0';
 694         num_str++;
 695
 696         if (!strlen(buf))
 697                 return ERR_PTR(-EINVAL);
 698
 699         ret = kstrtou8(num_str, 0, &num);
 700         if (ret)
 701                 return ERR_PTR(ret);
 702
 703         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 704         if (!cfg)
 705                 return ERR_PTR(-ENOMEM);
 706         cfg->c.label = kstrdup(buf, GFP_KERNEL);
 707         if (!cfg->c.label) {
 708                 ret = -ENOMEM;
 709                 goto err;
 710         }
 711         cfg->c.bConfigurationValue = num;
 712         cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
 713         cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
 714         INIT_LIST_HEAD(&cfg->string_list);
 715         INIT_LIST_HEAD(&cfg->func_list);
 716
 717         config_group_init_type_name(&cfg->group, name,
 718                                 &gadget_config_type);
 719
 720         config_group_init_type_name(&cfg->strings_group, "strings",
 721                         &gadget_config_name_strings_type);
 722         configfs_add_default_group(&cfg->strings_group, &cfg->group);
 723
 724         ret = usb_add_config_only(&gi->cdev, &cfg->c);
 725         if (ret)
 726                 goto err;
 727
 728         return &cfg->group;
 729 err:
 730         kfree(cfg->c.label);
 731         kfree(cfg);
 732         return ERR_PTR(ret);
 733 }
 734
 735 static void config_desc_drop(
 736                 struct config_group *group,
 737                 struct config_item *item)
 738 {
 739         config_item_put(item);
 740 }
 741
 742 static struct configfs_group_operations config_desc_ops = {
 743         .make_group     = &config_desc_make,
 744         .drop_item      = &config_desc_drop,
 745 };
 746
 747 static const struct config_item_type config_desc_type = {
 748         .ct_group_ops   = &config_desc_ops,
 749         .ct_owner       = THIS_MODULE,
 750 };
 751
 752 GS_STRINGS_RW(gadget_strings, manufacturer);
 753 GS_STRINGS_RW(gadget_strings, product);
 754 GS_STRINGS_RW(gadget_strings, serialnumber);
 755
 756 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
 757         &gadget_strings_attr_manufacturer,
 758         &gadget_strings_attr_product,
 759         &gadget_strings_attr_serialnumber,
 760         NULL,
 761 };
 762
 763 static void gadget_strings_attr_release(struct config_item *item)
 764 {
 765         struct gadget_strings *gs = to_gadget_strings(item);
 766
 767         kfree(gs->manufacturer);
 768         kfree(gs->product);
 769         kfree(gs->serialnumber);
 770
 771         list_del(&gs->list);
 772         kfree(gs);
 773 }
 774
 775 USB_CONFIG_STRING_RW_OPS(gadget_strings);
 776 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
 777
 778 static inline struct os_desc *to_os_desc(struct config_item *item)
 779 {
 780         return container_of(to_config_group(item), struct os_desc, group);
 781 }
 782
 783 static inline struct gadget_info *os_desc_item_to_gadget_info(
 784                 struct config_item *item)
 785 {
 786         return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
 787 }
 788
 789 static ssize_t os_desc_use_show(struct config_item *item, char *page)
 790 {
 791         return sprintf(page, "%d\n",
 792                         os_desc_item_to_gadget_info(item)->use_os_desc);
 793 }
 794
 795 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
 796                                  size_t len)
 797 {
 798         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 799         int ret;
 800         bool use;
 801
 802         mutex_lock(&gi->lock);
 803         ret = strtobool(page, &use);
 804         if (!ret) {
 805                 gi->use_os_desc = use;
 806                 ret = len;
 807         }
 808         mutex_unlock(&gi->lock);
 809
 810         return ret;
 811 }
 812
 813 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
 814 {
 815         return sprintf(page, "0x%02x\n",
 816                         os_desc_item_to_gadget_info(item)->b_vendor_code);
 817 }
 818
 819 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
 820                                            const char *page, size_t len)
 821 {
 822         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 823         int ret;
 824         u8 b_vendor_code;
 825
 826         mutex_lock(&gi->lock);
 827         ret = kstrtou8(page, 0, &b_vendor_code);
 828         if (!ret) {
 829                 gi->b_vendor_code = b_vendor_code;
 830                 ret = len;
 831         }
 832         mutex_unlock(&gi->lock);
 833
 834         return ret;
 835 }
 836
 837 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
 838 {
 839         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 840         int res;
 841
 842         res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
 843                               UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
 844         page[res++] = '\n';
 845
 846         return res;
 847 }
 848
 849 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
 850                                      size_t len)
 851 {
 852         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 853         int res, l;
 854
 855         l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
 856         if (page[l - 1] == '\n')
 857                 --l;
 858
 859         mutex_lock(&gi->lock);
 860         res = utf8s_to_utf16s(page, l,
 861                               UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
 862                               OS_STRING_QW_SIGN_LEN);
 863         if (res > 0)
 864                 res = len;
 865         mutex_unlock(&gi->lock);
 866
 867         return res;
 868 }
 869
 870 CONFIGFS_ATTR(os_desc_, use);
 871 CONFIGFS_ATTR(os_desc_, b_vendor_code);
 872 CONFIGFS_ATTR(os_desc_, qw_sign);
 873
 874 static struct configfs_attribute *os_desc_attrs[] = {
 875         &os_desc_attr_use,
 876         &os_desc_attr_b_vendor_code,
 877         &os_desc_attr_qw_sign,
 878         NULL,
 879 };
 880
 881 static void os_desc_attr_release(struct config_item *item)
 882 {
 883         struct os_desc *os_desc = to_os_desc(item);
 884         kfree(os_desc);
 885 }
 886
 887 static int os_desc_link(struct config_item *os_desc_ci,
 888                         struct config_item *usb_cfg_ci)
 889 {
 890         struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
 891                                         struct gadget_info, os_desc_group);
 892         struct usb_composite_dev *cdev = &gi->cdev;
 893         struct config_usb_cfg *c_target =
 894                 container_of(to_config_group(usb_cfg_ci),
 895                              struct config_usb_cfg, group);
 896         struct usb_configuration *c;
 897         int ret;
 898
 899         mutex_lock(&gi->lock);
 900         list_for_each_entry(c, &cdev->configs, list) {
 901                 if (c == &c_target->c)
 902                         break;
 903         }
 904         if (c != &c_target->c) {
 905                 ret = -EINVAL;
 906                 goto out;
 907         }
 908
 909         if (cdev->os_desc_config) {
 910                 ret = -EBUSY;
 911                 goto out;
 912         }
 913
 914         cdev->os_desc_config = &c_target->c;
 915         ret = 0;
 916
 917 out:
 918         mutex_unlock(&gi->lock);
 919         return ret;
 920 }
 921
 922 static void os_desc_unlink(struct config_item *os_desc_ci,
 923                           struct config_item *usb_cfg_ci)
 924 {
 925         struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
 926                                         struct gadget_info, os_desc_group);
 927         struct usb_composite_dev *cdev = &gi->cdev;
 928
 929         mutex_lock(&gi->lock);
 930         if (gi->composite.gadget_driver.udc_name)
 931                 unregister_gadget(gi);
 932         cdev->os_desc_config = NULL;
 933         WARN_ON(gi->composite.gadget_driver.udc_name);
 934         mutex_unlock(&gi->lock);
 935 }
 936
 937 static struct configfs_item_operations os_desc_ops = {
 938         .release                = os_desc_attr_release,
 939         .allow_link             = os_desc_link,
 940         .drop_link              = os_desc_unlink,
 941 };
 942
 943 static struct config_item_type os_desc_type = {
 944         .ct_item_ops    = &os_desc_ops,
 945         .ct_attrs       = os_desc_attrs,
 946         .ct_owner       = THIS_MODULE,
 947 };
 948
 949 static inline struct usb_os_desc_ext_prop
 950 *to_usb_os_desc_ext_prop(struct config_item *item)
 951 {
 952         return container_of(item, struct usb_os_desc_ext_prop, item);
 953 }
 954
 955 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
 956 {
 957         return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
 958 }
 959
 960 static ssize_t ext_prop_type_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         u8 type;
 966         int ret;
 967
 968         if (desc->opts_mutex)
 969                 mutex_lock(desc->opts_mutex);
 970         ret = kstrtou8(page, 0, &type);
 971         if (ret)
 972                 goto end;
 973         if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
 974                 ret = -EINVAL;
 975                 goto end;
 976         }
 977
 978         if ((ext_prop->type == USB_EXT_PROP_BINARY ||
 979             ext_prop->type == USB_EXT_PROP_LE32 ||
 980             ext_prop->type == USB_EXT_PROP_BE32) &&
 981             (type == USB_EXT_PROP_UNICODE ||
 982             type == USB_EXT_PROP_UNICODE_ENV ||
 983             type == USB_EXT_PROP_UNICODE_LINK))
 984                 ext_prop->data_len <<= 1;
 985         else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
 986                    ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
 987                    ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
 988                    (type == USB_EXT_PROP_BINARY ||
 989                    type == USB_EXT_PROP_LE32 ||
 990                    type == USB_EXT_PROP_BE32))
 991                 ext_prop->data_len >>= 1;
 992         ext_prop->type = type;
 993         ret = len;
 994
 995 end:
 996         if (desc->opts_mutex)
 997                 mutex_unlock(desc->opts_mutex);
 998         return ret;
 999 }
1000
1001 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
1002 {
1003         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1004         int len = ext_prop->data_len;
1005
1006         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1007             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1008             ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1009                 len >>= 1;
1010         memcpy(page, ext_prop->data, len);
1011
1012         return len;
1013 }
1014
1015 static ssize_t ext_prop_data_store(struct config_item *item,
1016                                    const char *page, size_t len)
1017 {
1018         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1019         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1020         char *new_data;
1021         size_t ret_len = len;
1022
1023         if (page[len - 1] == '\n' || page[len - 1] == '\0')
1024                 --len;
1025         new_data = kmemdup(page, len, GFP_KERNEL);
1026         if (!new_data)
1027                 return -ENOMEM;
1028
1029         if (desc->opts_mutex)
1030                 mutex_lock(desc->opts_mutex);
1031         kfree(ext_prop->data);
1032         ext_prop->data = new_data;
1033         desc->ext_prop_len -= ext_prop->data_len;
1034         ext_prop->data_len = len;
1035         desc->ext_prop_len += ext_prop->data_len;
1036         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1037             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1038             ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1039                 desc->ext_prop_len -= ext_prop->data_len;
1040                 ext_prop->data_len <<= 1;
1041                 ext_prop->data_len += 2;
1042                 desc->ext_prop_len += ext_prop->data_len;
1043         }
1044         if (desc->opts_mutex)
1045                 mutex_unlock(desc->opts_mutex);
1046         return ret_len;
1047 }
1048
1049 CONFIGFS_ATTR(ext_prop_, type);
1050 CONFIGFS_ATTR(ext_prop_, data);
1051
1052 static struct configfs_attribute *ext_prop_attrs[] = {
1053         &ext_prop_attr_type,
1054         &ext_prop_attr_data,
1055         NULL,
1056 };
1057
1058 static void usb_os_desc_ext_prop_release(struct config_item *item)
1059 {
1060         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1061
1062         kfree(ext_prop); /* frees a whole chunk */
1063 }
1064
1065 static struct configfs_item_operations ext_prop_ops = {
1066         .release                = usb_os_desc_ext_prop_release,
1067 };
1068
1069 static struct config_item *ext_prop_make(
1070                 struct config_group *group,
1071                 const char *name)
1072 {
1073         struct usb_os_desc_ext_prop *ext_prop;
1074         struct config_item_type *ext_prop_type;
1075         struct usb_os_desc *desc;
1076         char *vlabuf;
1077
1078         vla_group(data_chunk);
1079         vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1080         vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1081
1082         vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1083         if (!vlabuf)
1084                 return ERR_PTR(-ENOMEM);
1085
1086         ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1087         ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1088
1089         desc = container_of(group, struct usb_os_desc, group);
1090         ext_prop_type->ct_item_ops = &ext_prop_ops;
1091         ext_prop_type->ct_attrs = ext_prop_attrs;
1092         ext_prop_type->ct_owner = desc->owner;
1093
1094         config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1095
1096         ext_prop->name = kstrdup(name, GFP_KERNEL);
1097         if (!ext_prop->name) {
1098                 kfree(vlabuf);
1099                 return ERR_PTR(-ENOMEM);
1100         }
1101         desc->ext_prop_len += 14;
1102         ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1103         if (desc->opts_mutex)
1104                 mutex_lock(desc->opts_mutex);
1105         desc->ext_prop_len += ext_prop->name_len;
1106         list_add_tail(&ext_prop->entry, &desc->ext_prop);
1107         ++desc->ext_prop_count;
1108         if (desc->opts_mutex)
1109                 mutex_unlock(desc->opts_mutex);
1110
1111         return &ext_prop->item;
1112 }
1113
1114 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1115 {
1116         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1117         struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1118
1119         if (desc->opts_mutex)
1120                 mutex_lock(desc->opts_mutex);
1121         list_del(&ext_prop->entry);
1122         --desc->ext_prop_count;
1123         kfree(ext_prop->name);
1124         desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1125         if (desc->opts_mutex)
1126                 mutex_unlock(desc->opts_mutex);
1127         config_item_put(item);
1128 }
1129
1130 static struct configfs_group_operations interf_grp_ops = {
1131         .make_item      = &ext_prop_make,
1132         .drop_item      = &ext_prop_drop,
1133 };
1134
1135 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1136                                              char *page)
1137 {
1138         memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1139         return 8;
1140 }
1141
1142 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1143                                               const char *page, size_t len)
1144 {
1145         struct usb_os_desc *desc = to_usb_os_desc(item);
1146         int l;
1147
1148         l = min_t(int, 8, len);
1149         if (page[l - 1] == '\n')
1150                 --l;
1151         if (desc->opts_mutex)
1152                 mutex_lock(desc->opts_mutex);
1153         memcpy(desc->ext_compat_id, page, l);
1154
1155         if (desc->opts_mutex)
1156                 mutex_unlock(desc->opts_mutex);
1157
1158         return len;
1159 }
1160
1161 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1162                                                  char *page)
1163 {
1164         memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1165         return 8;
1166 }
1167
1168 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1169                                                   const char *page, size_t len)
1170 {
1171         struct usb_os_desc *desc = to_usb_os_desc(item);
1172         int l;
1173
1174         l = min_t(int, 8, len);
1175         if (page[l - 1] == '\n')
1176                 --l;
1177         if (desc->opts_mutex)
1178                 mutex_lock(desc->opts_mutex);
1179         memcpy(desc->ext_compat_id + 8, page, l);
1180
1181         if (desc->opts_mutex)
1182                 mutex_unlock(desc->opts_mutex);
1183
1184         return len;
1185 }
1186
1187 CONFIGFS_ATTR(interf_grp_, compatible_id);
1188 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1189
1190 static struct configfs_attribute *interf_grp_attrs[] = {
1191         &interf_grp_attr_compatible_id,
1192         &interf_grp_attr_sub_compatible_id,
1193         NULL
1194 };
1195
1196 struct config_group *usb_os_desc_prepare_interf_dir(
1197                 struct config_group *parent,
1198                 int n_interf,
1199                 struct usb_os_desc **desc,
1200                 char **names,
1201                 struct module *owner)
1202 {
1203         struct config_group *os_desc_group;
1204         struct config_item_type *os_desc_type, *interface_type;
1205
1206         vla_group(data_chunk);
1207         vla_item(data_chunk, struct config_group, os_desc_group, 1);
1208         vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1209         vla_item(data_chunk, struct config_item_type, interface_type, 1);
1210
1211         char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1212         if (!vlabuf)
1213                 return ERR_PTR(-ENOMEM);
1214
1215         os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1216         os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1217         interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1218
1219         os_desc_type->ct_owner = owner;
1220         config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1221         configfs_add_default_group(os_desc_group, parent);
1222
1223         interface_type->ct_group_ops = &interf_grp_ops;
1224         interface_type->ct_attrs = interf_grp_attrs;
1225         interface_type->ct_owner = owner;
1226
1227         while (n_interf--) {
1228                 struct usb_os_desc *d;
1229
1230                 d = desc[n_interf];
1231                 d->owner = owner;
1232                 config_group_init_type_name(&d->group, "", interface_type);
1233                 config_item_set_name(&d->group.cg_item, "interface.%s",
1234                                      names[n_interf]);
1235                 configfs_add_default_group(&d->group, os_desc_group);
1236         }
1237
1238         return os_desc_group;
1239 }
1240 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1241
1242 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1243 {
1244         WARN_ON(1);
1245         return -EINVAL;
1246 }
1247
1248 int composite_dev_prepare(struct usb_composite_driver *composite,
1249                 struct usb_composite_dev *dev);
1250
1251 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1252                                   struct usb_ep *ep0);
1253
1254 static void purge_configs_funcs(struct gadget_info *gi)
1255 {
1256         struct usb_configuration        *c;
1257
1258         list_for_each_entry(c, &gi->cdev.configs, list) {
1259                 struct usb_function *f, *tmp;
1260                 struct config_usb_cfg *cfg;
1261
1262                 cfg = container_of(c, struct config_usb_cfg, c);
1263
1264                 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1265
1266                         list_move(&f->list, &cfg->func_list);
1267                         if (f->unbind) {
1268                                 dev_dbg(&gi->cdev.gadget->dev,
1269                                         "unbind function '%s'/%p\n",
1270                                         f->name, f);
1271                                 f->unbind(c, f);
1272                         }
1273                 }
1274                 c->next_interface_id = 0;
1275                 memset(c->interface, 0, sizeof(c->interface));
1276                 c->superspeed_plus = 0;
1277                 c->superspeed = 0;
1278                 c->highspeed = 0;
1279                 c->fullspeed = 0;
1280         }
1281 }
1282
1283 static int configfs_composite_bind(struct usb_gadget *gadget,
1284                 struct usb_gadget_driver *gdriver)
1285 {
1286         struct usb_composite_driver     *composite = to_cdriver(gdriver);
1287         struct gadget_info              *gi = container_of(composite,
1288                                                 struct gadget_info, composite);
1289         struct usb_composite_dev        *cdev = &gi->cdev;
1290         struct usb_configuration        *c;
1291         struct usb_string               *s;
1292         unsigned                        i;
1293         int                             ret;
1294
1295         /* the gi->lock is hold by the caller */
1296         gi->unbind = 0;
1297         cdev->gadget = gadget;
1298         set_gadget_data(gadget, cdev);
1299         ret = composite_dev_prepare(composite, cdev);
1300         if (ret)
1301                 return ret;
1302         /* and now the gadget bind */
1303         ret = -EINVAL;
1304
1305         if (list_empty(&gi->cdev.configs)) {
1306                 pr_err("Need at least one configuration in %s.\n",
1307                                 gi->composite.name);
1308                 goto err_comp_cleanup;
1309         }
1310
1311
1312         list_for_each_entry(c, &gi->cdev.configs, list) {
1313                 struct config_usb_cfg *cfg;
1314
1315                 cfg = container_of(c, struct config_usb_cfg, c);
1316                 if (list_empty(&cfg->func_list)) {
1317                         pr_err("Config %s/%d of %s needs at least one function.\n",
1318                               c->label, c->bConfigurationValue,
1319                               gi->composite.name);
1320                         goto err_comp_cleanup;
1321                 }
1322         }
1323
1324         /* init all strings */
1325         if (!list_empty(&gi->string_list)) {
1326                 struct gadget_strings *gs;
1327
1328                 i = 0;
1329                 list_for_each_entry(gs, &gi->string_list, list) {
1330
1331                         gi->gstrings[i] = &gs->stringtab_dev;
1332                         gs->stringtab_dev.strings = gs->strings;
1333                         gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1334                                 gs->manufacturer;
1335                         gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1336                         gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1337                         i++;
1338                 }
1339                 gi->gstrings[i] = NULL;
1340                 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1341                                 USB_GADGET_FIRST_AVAIL_IDX);
1342                 if (IS_ERR(s)) {
1343                         ret = PTR_ERR(s);
1344                         goto err_comp_cleanup;
1345                 }
1346
1347                 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1348                 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1349                 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1350         }
1351
1352         if (gi->use_os_desc) {
1353                 cdev->use_os_string = true;
1354                 cdev->b_vendor_code = gi->b_vendor_code;
1355                 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1356         }
1357
1358         if (gadget_is_otg(gadget) && !otg_desc[0]) {
1359                 struct usb_descriptor_header *usb_desc;
1360
1361                 usb_desc = usb_otg_descriptor_alloc(gadget);
1362                 if (!usb_desc) {
1363                         ret = -ENOMEM;
1364                         goto err_comp_cleanup;
1365                 }
1366                 usb_otg_descriptor_init(gadget, usb_desc);
1367                 otg_desc[0] = usb_desc;
1368                 otg_desc[1] = NULL;
1369         }
1370
1371         /* Go through all configs, attach all functions */
1372         list_for_each_entry(c, &gi->cdev.configs, list) {
1373                 struct config_usb_cfg *cfg;
1374                 struct usb_function *f;
1375                 struct usb_function *tmp;
1376                 struct gadget_config_name *cn;
1377
1378                 if (gadget_is_otg(gadget))
1379                         c->descriptors = otg_desc;
1380
1381                 cfg = container_of(c, struct config_usb_cfg, c);
1382                 if (!list_empty(&cfg->string_list)) {
1383                         i = 0;
1384                         list_for_each_entry(cn, &cfg->string_list, list) {
1385                                 cfg->gstrings[i] = &cn->stringtab_dev;
1386                                 cn->stringtab_dev.strings = &cn->strings;
1387                                 cn->strings.s = cn->configuration;
1388                                 i++;
1389                         }
1390                         cfg->gstrings[i] = NULL;
1391                         s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1392                         if (IS_ERR(s)) {
1393                                 ret = PTR_ERR(s);
1394                                 goto err_comp_cleanup;
1395                         }
1396                         c->iConfiguration = s[0].id;
1397                 }
1398
1399                 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1400                         list_del(&f->list);
1401                         ret = usb_add_function(c, f);
1402                         if (ret) {
1403                                 list_add(&f->list, &cfg->func_list);
1404                                 goto err_purge_funcs;
1405                         }
1406                 }
1407                 ret = usb_gadget_check_config(cdev->gadget);
1408                 if (ret)
1409                         goto err_purge_funcs;
1410
1411                 usb_ep_autoconfig_reset(cdev->gadget);
1412         }
1413         if (cdev->use_os_string) {
1414                 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1415                 if (ret)
1416                         goto err_purge_funcs;
1417         }
1418
1419         usb_ep_autoconfig_reset(cdev->gadget);
1420         return 0;
1421
1422 err_purge_funcs:
1423         purge_configs_funcs(gi);
1424 err_comp_cleanup:
1425         composite_dev_cleanup(cdev);
1426         return ret;
1427 }
1428
1429 static void configfs_composite_unbind(struct usb_gadget *gadget)
1430 {
1431         struct usb_composite_dev        *cdev;
1432         struct gadget_info              *gi;
1433         unsigned long flags;
1434
1435         /* the gi->lock is hold by the caller */
1436
1437         cdev = get_gadget_data(gadget);
1438         gi = container_of(cdev, struct gadget_info, cdev);
1439         spin_lock_irqsave(&gi->spinlock, flags);
1440         gi->unbind = 1;
1441         spin_unlock_irqrestore(&gi->spinlock, flags);
1442
1443         kfree(otg_desc[0]);
1444         otg_desc[0] = NULL;
1445         purge_configs_funcs(gi);
1446         composite_dev_cleanup(cdev);
1447         usb_ep_autoconfig_reset(cdev->gadget);
1448         spin_lock_irqsave(&gi->spinlock, flags);
1449         cdev->gadget = NULL;
1450         set_gadget_data(gadget, NULL);
1451         spin_unlock_irqrestore(&gi->spinlock, flags);
1452 }
1453
1454 static int configfs_composite_setup(struct usb_gadget *gadget,
1455                 const struct usb_ctrlrequest *ctrl)
1456 {
1457         struct usb_composite_dev *cdev;
1458         struct gadget_info *gi;
1459         unsigned long flags;
1460         int ret;
1461
1462         cdev = get_gadget_data(gadget);
1463         if (!cdev)
1464                 return 0;
1465
1466         gi = container_of(cdev, struct gadget_info, cdev);
1467         spin_lock_irqsave(&gi->spinlock, flags);
1468         cdev = get_gadget_data(gadget);
1469         if (!cdev || gi->unbind) {
1470                 spin_unlock_irqrestore(&gi->spinlock, flags);
1471                 return 0;
1472         }
1473
1474         ret = composite_setup(gadget, ctrl);
1475         spin_unlock_irqrestore(&gi->spinlock, flags);
1476         return ret;
1477 }
1478
1479 static void configfs_composite_disconnect(struct usb_gadget *gadget)
1480 {
1481         struct usb_composite_dev *cdev;
1482         struct gadget_info *gi;
1483         unsigned long flags;
1484
1485         cdev = get_gadget_data(gadget);
1486         if (!cdev)
1487                 return;
1488
1489         gi = container_of(cdev, struct gadget_info, cdev);
1490         spin_lock_irqsave(&gi->spinlock, flags);
1491         cdev = get_gadget_data(gadget);
1492         if (!cdev || gi->unbind) {
1493                 spin_unlock_irqrestore(&gi->spinlock, flags);
1494                 return;
1495         }
1496
1497         composite_disconnect(gadget);
1498         spin_unlock_irqrestore(&gi->spinlock, flags);
1499 }
1500
1501 static void configfs_composite_reset(struct usb_gadget *gadget)
1502 {
1503         struct usb_composite_dev *cdev;
1504         struct gadget_info *gi;
1505         unsigned long flags;
1506
1507         cdev = get_gadget_data(gadget);
1508         if (!cdev)
1509                 return;
1510
1511         gi = container_of(cdev, struct gadget_info, cdev);
1512         spin_lock_irqsave(&gi->spinlock, flags);
1513         cdev = get_gadget_data(gadget);
1514         if (!cdev || gi->unbind) {
1515                 spin_unlock_irqrestore(&gi->spinlock, flags);
1516                 return;
1517         }
1518
1519         composite_reset(gadget);
1520         spin_unlock_irqrestore(&gi->spinlock, flags);
1521 }
1522
1523 static void configfs_composite_suspend(struct usb_gadget *gadget)
1524 {
1525         struct usb_composite_dev *cdev;
1526         struct gadget_info *gi;
1527         unsigned long flags;
1528
1529         cdev = get_gadget_data(gadget);
1530         if (!cdev)
1531                 return;
1532
1533         gi = container_of(cdev, struct gadget_info, cdev);
1534         spin_lock_irqsave(&gi->spinlock, flags);
1535         cdev = get_gadget_data(gadget);
1536         if (!cdev || gi->unbind) {
1537                 spin_unlock_irqrestore(&gi->spinlock, flags);
1538                 return;
1539         }
1540
1541         composite_suspend(gadget);
1542         spin_unlock_irqrestore(&gi->spinlock, flags);
1543 }
1544
1545 static void configfs_composite_resume(struct usb_gadget *gadget)
1546 {
1547         struct usb_composite_dev *cdev;
1548         struct gadget_info *gi;
1549         unsigned long flags;
1550
1551         cdev = get_gadget_data(gadget);
1552         if (!cdev)
1553                 return;
1554
1555         gi = container_of(cdev, struct gadget_info, cdev);
1556         spin_lock_irqsave(&gi->spinlock, flags);
1557         cdev = get_gadget_data(gadget);
1558         if (!cdev || gi->unbind) {
1559                 spin_unlock_irqrestore(&gi->spinlock, flags);
1560                 return;
1561         }
1562
1563         composite_resume(gadget);
1564         spin_unlock_irqrestore(&gi->spinlock, flags);
1565 }
1566
1567 static const struct usb_gadget_driver configfs_driver_template = {
1568         .bind           = configfs_composite_bind,
1569         .unbind         = configfs_composite_unbind,
1570
1571         .setup          = configfs_composite_setup,
1572         .reset          = configfs_composite_reset,
1573         .disconnect     = configfs_composite_disconnect,
1574
1575         .suspend        = configfs_composite_suspend,
1576         .resume         = configfs_composite_resume,
1577
1578         .max_speed      = USB_SPEED_SUPER_PLUS,
1579         .driver = {
1580                 .owner          = THIS_MODULE,
1581                 .name           = "configfs-gadget",
1582         },
1583         .match_existing_only = 1,
1584 };
1585
1586 static struct config_group *gadgets_make(
1587                 struct config_group *group,
1588                 const char *name)
1589 {
1590         struct gadget_info *gi;
1591
1592         gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1593         if (!gi)
1594                 return ERR_PTR(-ENOMEM);
1595
1596         config_group_init_type_name(&gi->group, name, &gadget_root_type);
1597
1598         config_group_init_type_name(&gi->functions_group, "functions",
1599                         &functions_type);
1600         configfs_add_default_group(&gi->functions_group, &gi->group);
1601
1602         config_group_init_type_name(&gi->configs_group, "configs",
1603                         &config_desc_type);
1604         configfs_add_default_group(&gi->configs_group, &gi->group);
1605
1606         config_group_init_type_name(&gi->strings_group, "strings",
1607                         &gadget_strings_strings_type);
1608         configfs_add_default_group(&gi->strings_group, &gi->group);
1609
1610         config_group_init_type_name(&gi->os_desc_group, "os_desc",
1611                         &os_desc_type);
1612         configfs_add_default_group(&gi->os_desc_group, &gi->group);
1613
1614         gi->composite.bind = configfs_do_nothing;
1615         gi->composite.unbind = configfs_do_nothing;
1616         gi->composite.suspend = NULL;
1617         gi->composite.resume = NULL;
1618         gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
1619
1620         spin_lock_init(&gi->spinlock);
1621         mutex_init(&gi->lock);
1622         INIT_LIST_HEAD(&gi->string_list);
1623         INIT_LIST_HEAD(&gi->available_func);
1624
1625         composite_init_dev(&gi->cdev);
1626         gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1627         gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1628         gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1629
1630         gi->composite.gadget_driver = configfs_driver_template;
1631
1632         gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1633         gi->composite.name = gi->composite.gadget_driver.function;
1634
1635         if (!gi->composite.gadget_driver.function)
1636                 goto err;
1637
1638         return &gi->group;
1639 err:
1640         kfree(gi);
1641         return ERR_PTR(-ENOMEM);
1642 }
1643
1644 static void gadgets_drop(struct config_group *group, struct config_item *item)
1645 {
1646         config_item_put(item);
1647 }
1648
1649 static struct configfs_group_operations gadgets_ops = {
1650         .make_group     = &gadgets_make,
1651         .drop_item      = &gadgets_drop,
1652 };
1653
1654 static const struct config_item_type gadgets_type = {
1655         .ct_group_ops   = &gadgets_ops,
1656         .ct_owner       = THIS_MODULE,
1657 };
1658
1659 static struct configfs_subsystem gadget_subsys = {
1660         .su_group = {
1661                 .cg_item = {
1662                         .ci_namebuf = "usb_gadget",
1663                         .ci_type = &gadgets_type,
1664                 },
1665         },
1666         .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1667 };
1668
1669 void unregister_gadget_item(struct config_item *item)
1670 {
1671         struct gadget_info *gi = to_gadget_info(item);
1672
1673         mutex_lock(&gi->lock);
1674         unregister_gadget(gi);
1675         mutex_unlock(&gi->lock);
1676 }
1677 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1678
1679 static int __init gadget_cfs_init(void)
1680 {
1681         int ret;
1682
1683         config_group_init(&gadget_subsys.su_group);
1684
1685         ret = configfs_register_subsystem(&gadget_subsys);
1686         return ret;
1687 }
1688 module_init(gadget_cfs_init);
1689
1690 static void __exit gadget_cfs_exit(void)
1691 {
1692         configfs_unregister_subsystem(&gadget_subsys);
1693 }
1694 module_exit(gadget_cfs_exit);