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 static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg)
  77 {
  78         return container_of(cfg->c.cdev, struct gadget_info, cdev);
  79 }
  80
  81 struct gadget_strings {
  82         struct usb_gadget_strings stringtab_dev;
  83         struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
  84         char *manufacturer;
  85         char *product;
  86         char *serialnumber;
  87
  88         struct config_group group;
  89         struct list_head list;
  90 };
  91
  92 struct gadget_config_name {
  93         struct usb_gadget_strings stringtab_dev;
  94         struct usb_string strings;
  95         char *configuration;
  96
  97         struct config_group group;
  98         struct list_head list;
  99 };
 100
 101 #define USB_MAX_STRING_WITH_NULL_LEN    (USB_MAX_STRING_LEN+1)
 102
 103 static int usb_string_copy(const char *s, char **s_copy)
 104 {
 105         int ret;
 106         char *str;
 107         char *copy = *s_copy;
 108         ret = strlen(s);
 109         if (ret > USB_MAX_STRING_LEN)
 110                 return -EOVERFLOW;
 111
 112         if (copy) {
 113                 str = copy;
 114         } else {
 115                 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
 116                 if (!str)
 117                         return -ENOMEM;
 118         }
 119         strcpy(str, s);
 120         if (str[ret - 1] == '\n')
 121                 str[ret - 1] = '\0';
 122         *s_copy = str;
 123         return 0;
 124 }
 125
 126 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name)      \
 127 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
 128                         char *page)     \
 129 {       \
 130         return sprintf(page, "0x%02x\n", \
 131                 to_gadget_info(item)->cdev.desc.__name); \
 132 }
 133
 134 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name)     \
 135 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
 136                         char *page)     \
 137 {       \
 138         return sprintf(page, "0x%04x\n", \
 139                 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
 140 }
 141
 142
 143 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name)               \
 144 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 145                 const char *page, size_t len)           \
 146 {                                                       \
 147         u8 val;                                         \
 148         int ret;                                        \
 149         ret = kstrtou8(page, 0, &val);                  \
 150         if (ret)                                        \
 151                 return ret;                             \
 152         to_gadget_info(item)->cdev.desc._name = val;    \
 153         return len;                                     \
 154 }
 155
 156 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name)      \
 157 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 158                 const char *page, size_t len)           \
 159 {                                                       \
 160         u16 val;                                        \
 161         int ret;                                        \
 162         ret = kstrtou16(page, 0, &val);                 \
 163         if (ret)                                        \
 164                 return ret;                             \
 165         to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val);     \
 166         return len;                                     \
 167 }
 168
 169 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type)  \
 170         GI_DEVICE_DESC_SIMPLE_R_##_type(_name)  \
 171         GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
 172
 173 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
 174 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
 175 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
 176 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
 177 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
 178 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
 179 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
 180 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
 181
 182 static ssize_t is_valid_bcd(u16 bcd_val)
 183 {
 184         if ((bcd_val & 0xf) > 9)
 185                 return -EINVAL;
 186         if (((bcd_val >> 4) & 0xf) > 9)
 187                 return -EINVAL;
 188         if (((bcd_val >> 8) & 0xf) > 9)
 189                 return -EINVAL;
 190         if (((bcd_val >> 12) & 0xf) > 9)
 191                 return -EINVAL;
 192         return 0;
 193 }
 194
 195 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
 196                 const char *page, size_t len)
 197 {
 198         u16 bcdDevice;
 199         int ret;
 200
 201         ret = kstrtou16(page, 0, &bcdDevice);
 202         if (ret)
 203                 return ret;
 204         ret = is_valid_bcd(bcdDevice);
 205         if (ret)
 206                 return ret;
 207
 208         to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
 209         return len;
 210 }
 211
 212 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
 213                 const char *page, size_t len)
 214 {
 215         u16 bcdUSB;
 216         int ret;
 217
 218         ret = kstrtou16(page, 0, &bcdUSB);
 219         if (ret)
 220                 return ret;
 221         ret = is_valid_bcd(bcdUSB);
 222         if (ret)
 223                 return ret;
 224
 225         to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
 226         return len;
 227 }
 228
 229 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
 230 {
 231         struct gadget_info *gi = to_gadget_info(item);
 232         char *udc_name;
 233         int ret;
 234
 235         mutex_lock(&gi->lock);
 236         udc_name = gi->composite.gadget_driver.udc_name;
 237         ret = sprintf(page, "%s\n", udc_name ?: "");
 238         mutex_unlock(&gi->lock);
 239
 240         return ret;
 241 }
 242
 243 static int unregister_gadget(struct gadget_info *gi)
 244 {
 245         int ret;
 246
 247         if (!gi->composite.gadget_driver.udc_name)
 248                 return -ENODEV;
 249
 250         ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
 251         if (ret)
 252                 return ret;
 253         kfree(gi->composite.gadget_driver.udc_name);
 254         gi->composite.gadget_driver.udc_name = NULL;
 255         return 0;
 256 }
 257
 258 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
 259                 const char *page, size_t len)
 260 {
 261         struct gadget_info *gi = to_gadget_info(item);
 262         char *name;
 263         int ret;
 264
 265         if (strlen(page) < len)
 266                 return -EOVERFLOW;
 267
 268         name = kstrdup(page, GFP_KERNEL);
 269         if (!name)
 270                 return -ENOMEM;
 271         if (name[len - 1] == '\n')
 272                 name[len - 1] = '\0';
 273
 274         mutex_lock(&gi->lock);
 275
 276         if (!strlen(name)) {
 277                 ret = unregister_gadget(gi);
 278                 if (ret)
 279                         goto err;
 280                 kfree(name);
 281         } else {
 282                 if (gi->composite.gadget_driver.udc_name) {
 283                         ret = -EBUSY;
 284                         goto err;
 285                 }
 286                 gi->composite.gadget_driver.udc_name = name;
 287                 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
 288                 if (ret) {
 289                         gi->composite.gadget_driver.udc_name = NULL;
 290                         goto err;
 291                 }
 292         }
 293         mutex_unlock(&gi->lock);
 294         return len;
 295 err:
 296         kfree(name);
 297         mutex_unlock(&gi->lock);
 298         return ret;
 299 }
 300
 301 static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
 302                                               char *page)
 303 {
 304         enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
 305
 306         return sprintf(page, "%s\n", usb_speed_string(speed));
 307 }
 308
 309 static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
 310                                                const char *page, size_t len)
 311 {
 312         struct gadget_info *gi = to_gadget_info(item);
 313
 314         mutex_lock(&gi->lock);
 315
 316         /* Prevent changing of max_speed after the driver is binded */
 317         if (gi->composite.gadget_driver.udc_name)
 318                 goto err;
 319
 320         if (strncmp(page, "super-speed-plus", 16) == 0)
 321                 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
 322         else if (strncmp(page, "super-speed", 11) == 0)
 323                 gi->composite.max_speed = USB_SPEED_SUPER;
 324         else if (strncmp(page, "high-speed", 10) == 0)
 325                 gi->composite.max_speed = USB_SPEED_HIGH;
 326         else if (strncmp(page, "full-speed", 10) == 0)
 327                 gi->composite.max_speed = USB_SPEED_FULL;
 328         else if (strncmp(page, "low-speed", 9) == 0)
 329                 gi->composite.max_speed = USB_SPEED_LOW;
 330         else
 331                 goto err;
 332
 333         gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
 334
 335         mutex_unlock(&gi->lock);
 336         return len;
 337 err:
 338         mutex_unlock(&gi->lock);
 339         return -EINVAL;
 340 }
 341
 342 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
 343 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
 344 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
 345 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
 346 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
 347 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
 348 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
 349 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
 350 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
 351 CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
 352
 353 static struct configfs_attribute *gadget_root_attrs[] = {
 354         &gadget_dev_desc_attr_bDeviceClass,
 355         &gadget_dev_desc_attr_bDeviceSubClass,
 356         &gadget_dev_desc_attr_bDeviceProtocol,
 357         &gadget_dev_desc_attr_bMaxPacketSize0,
 358         &gadget_dev_desc_attr_idVendor,
 359         &gadget_dev_desc_attr_idProduct,
 360         &gadget_dev_desc_attr_bcdDevice,
 361         &gadget_dev_desc_attr_bcdUSB,
 362         &gadget_dev_desc_attr_UDC,
 363         &gadget_dev_desc_attr_max_speed,
 364         NULL,
 365 };
 366
 367 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
 368 {
 369         return container_of(to_config_group(item), struct gadget_strings,
 370                          group);
 371 }
 372
 373 static inline struct gadget_config_name *to_gadget_config_name(
 374                 struct config_item *item)
 375 {
 376         return container_of(to_config_group(item), struct gadget_config_name,
 377                          group);
 378 }
 379
 380 static inline struct usb_function_instance *to_usb_function_instance(
 381                 struct config_item *item)
 382 {
 383         return container_of(to_config_group(item),
 384                          struct usb_function_instance, group);
 385 }
 386
 387 static void gadget_info_attr_release(struct config_item *item)
 388 {
 389         struct gadget_info *gi = to_gadget_info(item);
 390
 391         WARN_ON(!list_empty(&gi->cdev.configs));
 392         WARN_ON(!list_empty(&gi->string_list));
 393         WARN_ON(!list_empty(&gi->available_func));
 394         kfree(gi->composite.gadget_driver.function);
 395         kfree(gi);
 396 }
 397
 398 static struct configfs_item_operations gadget_root_item_ops = {
 399         .release                = gadget_info_attr_release,
 400 };
 401
 402 static void gadget_config_attr_release(struct config_item *item)
 403 {
 404         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 405
 406         WARN_ON(!list_empty(&cfg->c.functions));
 407         list_del(&cfg->c.list);
 408         kfree(cfg->c.label);
 409         kfree(cfg);
 410 }
 411
 412 static int config_usb_cfg_link(
 413         struct config_item *usb_cfg_ci,
 414         struct config_item *usb_func_ci)
 415 {
 416         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 417         struct gadget_info *gi = cfg_to_gadget_info(cfg);
 418
 419         struct usb_function_instance *fi =
 420                         to_usb_function_instance(usb_func_ci);
 421         struct usb_function_instance *a_fi;
 422         struct usb_function *f;
 423         int ret;
 424
 425         mutex_lock(&gi->lock);
 426         /*
 427          * Make sure this function is from within our _this_ gadget and not
 428          * from another gadget or a random directory.
 429          * Also a function instance can only be linked once.
 430          */
 431         list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
 432                 if (a_fi == fi)
 433                         break;
 434         }
 435         if (a_fi != fi) {
 436                 ret = -EINVAL;
 437                 goto out;
 438         }
 439
 440         list_for_each_entry(f, &cfg->func_list, list) {
 441                 if (f->fi == fi) {
 442                         ret = -EEXIST;
 443                         goto out;
 444                 }
 445         }
 446
 447         f = usb_get_function(fi);
 448         if (IS_ERR(f)) {
 449                 ret = PTR_ERR(f);
 450                 goto out;
 451         }
 452
 453         /* stash the function until we bind it to the gadget */
 454         list_add_tail(&f->list, &cfg->func_list);
 455         ret = 0;
 456 out:
 457         mutex_unlock(&gi->lock);
 458         return ret;
 459 }
 460
 461 static void config_usb_cfg_unlink(
 462         struct config_item *usb_cfg_ci,
 463         struct config_item *usb_func_ci)
 464 {
 465         struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 466         struct gadget_info *gi = cfg_to_gadget_info(cfg);
 467
 468         struct usb_function_instance *fi =
 469                         to_usb_function_instance(usb_func_ci);
 470         struct usb_function *f;
 471
 472         /*
 473          * ideally I would like to forbid to unlink functions while a gadget is
 474          * bound to an UDC. Since this isn't possible at the moment, we simply
 475          * force an unbind, the function is available here and then we can
 476          * remove the function.
 477          */
 478         mutex_lock(&gi->lock);
 479         if (gi->composite.gadget_driver.udc_name)
 480                 unregister_gadget(gi);
 481         WARN_ON(gi->composite.gadget_driver.udc_name);
 482
 483         list_for_each_entry(f, &cfg->func_list, list) {
 484                 if (f->fi == fi) {
 485                         list_del(&f->list);
 486                         usb_put_function(f);
 487                         mutex_unlock(&gi->lock);
 488                         return;
 489                 }
 490         }
 491         mutex_unlock(&gi->lock);
 492         WARN(1, "Unable to locate function to unbind\n");
 493 }
 494
 495 static struct configfs_item_operations gadget_config_item_ops = {
 496         .release                = gadget_config_attr_release,
 497         .allow_link             = config_usb_cfg_link,
 498         .drop_link              = config_usb_cfg_unlink,
 499 };
 500
 501
 502 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
 503                 char *page)
 504 {
 505         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 506
 507         return sprintf(page, "%u\n", cfg->c.MaxPower);
 508 }
 509
 510 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
 511                 const char *page, size_t len)
 512 {
 513         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 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         cfg->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         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 529
 530         return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
 531 }
 532
 533 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
 534                 const char *page, size_t len)
 535 {
 536         struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 537         u8 val;
 538         int ret;
 539         ret = kstrtou8(page, 0, &val);
 540         if (ret)
 541                 return ret;
 542         if (!(val & USB_CONFIG_ATT_ONE))
 543                 return -EINVAL;
 544         if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
 545                                 USB_CONFIG_ATT_WAKEUP))
 546                 return -EINVAL;
 547         cfg->c.bmAttributes = val;
 548         return len;
 549 }
 550
 551 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
 552 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
 553
 554 static struct configfs_attribute *gadget_config_attrs[] = {
 555         &gadget_config_desc_attr_MaxPower,
 556         &gadget_config_desc_attr_bmAttributes,
 557         NULL,
 558 };
 559
 560 static const struct config_item_type gadget_config_type = {
 561         .ct_item_ops    = &gadget_config_item_ops,
 562         .ct_attrs       = gadget_config_attrs,
 563         .ct_owner       = THIS_MODULE,
 564 };
 565
 566 static const struct config_item_type gadget_root_type = {
 567         .ct_item_ops    = &gadget_root_item_ops,
 568         .ct_attrs       = gadget_root_attrs,
 569         .ct_owner       = THIS_MODULE,
 570 };
 571
 572 static void composite_init_dev(struct usb_composite_dev *cdev)
 573 {
 574         spin_lock_init(&cdev->lock);
 575         INIT_LIST_HEAD(&cdev->configs);
 576         INIT_LIST_HEAD(&cdev->gstrings);
 577 }
 578
 579 static struct config_group *function_make(
 580                 struct config_group *group,
 581                 const char *name)
 582 {
 583         struct gadget_info *gi;
 584         struct usb_function_instance *fi;
 585         char buf[MAX_NAME_LEN];
 586         char *func_name;
 587         char *instance_name;
 588         int ret;
 589
 590         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
 591         if (ret >= MAX_NAME_LEN)
 592                 return ERR_PTR(-ENAMETOOLONG);
 593
 594         func_name = buf;
 595         instance_name = strchr(func_name, '.');
 596         if (!instance_name) {
 597                 pr_err("Unable to locate . in FUNC.INSTANCE\n");
 598                 return ERR_PTR(-EINVAL);
 599         }
 600         *instance_name = '\0';
 601         instance_name++;
 602
 603         fi = usb_get_function_instance(func_name);
 604         if (IS_ERR(fi))
 605                 return ERR_CAST(fi);
 606
 607         ret = config_item_set_name(&fi->group.cg_item, "%s", name);
 608         if (ret) {
 609                 usb_put_function_instance(fi);
 610                 return ERR_PTR(ret);
 611         }
 612         if (fi->set_inst_name) {
 613                 ret = fi->set_inst_name(fi, instance_name);
 614                 if (ret) {
 615                         usb_put_function_instance(fi);
 616                         return ERR_PTR(ret);
 617                 }
 618         }
 619
 620         gi = container_of(group, struct gadget_info, functions_group);
 621
 622         mutex_lock(&gi->lock);
 623         list_add_tail(&fi->cfs_list, &gi->available_func);
 624         mutex_unlock(&gi->lock);
 625         return &fi->group;
 626 }
 627
 628 static void function_drop(
 629                 struct config_group *group,
 630                 struct config_item *item)
 631 {
 632         struct usb_function_instance *fi = to_usb_function_instance(item);
 633         struct gadget_info *gi;
 634
 635         gi = container_of(group, struct gadget_info, functions_group);
 636
 637         mutex_lock(&gi->lock);
 638         list_del(&fi->cfs_list);
 639         mutex_unlock(&gi->lock);
 640         config_item_put(item);
 641 }
 642
 643 static struct configfs_group_operations functions_ops = {
 644         .make_group     = &function_make,
 645         .drop_item      = &function_drop,
 646 };
 647
 648 static const struct config_item_type functions_type = {
 649         .ct_group_ops   = &functions_ops,
 650         .ct_owner       = THIS_MODULE,
 651 };
 652
 653 GS_STRINGS_RW(gadget_config_name, configuration);
 654
 655 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
 656         &gadget_config_name_attr_configuration,
 657         NULL,
 658 };
 659
 660 static void gadget_config_name_attr_release(struct config_item *item)
 661 {
 662         struct gadget_config_name *cn = to_gadget_config_name(item);
 663
 664         kfree(cn->configuration);
 665
 666         list_del(&cn->list);
 667         kfree(cn);
 668 }
 669
 670 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
 671 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
 672
 673 static struct config_group *config_desc_make(
 674                 struct config_group *group,
 675                 const char *name)
 676 {
 677         struct gadget_info *gi;
 678         struct config_usb_cfg *cfg;
 679         char buf[MAX_NAME_LEN];
 680         char *num_str;
 681         u8 num;
 682         int ret;
 683
 684         gi = container_of(group, struct gadget_info, configs_group);
 685         ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
 686         if (ret >= MAX_NAME_LEN)
 687                 return ERR_PTR(-ENAMETOOLONG);
 688
 689         num_str = strchr(buf, '.');
 690         if (!num_str) {
 691                 pr_err("Unable to locate . in name.bConfigurationValue\n");
 692                 return ERR_PTR(-EINVAL);
 693         }
 694
 695         *num_str = '\0';
 696         num_str++;
 697
 698         if (!strlen(buf))
 699                 return ERR_PTR(-EINVAL);
 700
 701         ret = kstrtou8(num_str, 0, &num);
 702         if (ret)
 703                 return ERR_PTR(ret);
 704
 705         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 706         if (!cfg)
 707                 return ERR_PTR(-ENOMEM);
 708         cfg->c.label = kstrdup(buf, GFP_KERNEL);
 709         if (!cfg->c.label) {
 710                 ret = -ENOMEM;
 711                 goto err;
 712         }
 713         cfg->c.bConfigurationValue = num;
 714         cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
 715         cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
 716         INIT_LIST_HEAD(&cfg->string_list);
 717         INIT_LIST_HEAD(&cfg->func_list);
 718
 719         config_group_init_type_name(&cfg->group, name,
 720                                 &gadget_config_type);
 721
 722         config_group_init_type_name(&cfg->strings_group, "strings",
 723                         &gadget_config_name_strings_type);
 724         configfs_add_default_group(&cfg->strings_group, &cfg->group);
 725
 726         ret = usb_add_config_only(&gi->cdev, &cfg->c);
 727         if (ret)
 728                 goto err;
 729
 730         return &cfg->group;
 731 err:
 732         kfree(cfg->c.label);
 733         kfree(cfg);
 734         return ERR_PTR(ret);
 735 }
 736
 737 static void config_desc_drop(
 738                 struct config_group *group,
 739                 struct config_item *item)
 740 {
 741         config_item_put(item);
 742 }
 743
 744 static struct configfs_group_operations config_desc_ops = {
 745         .make_group     = &config_desc_make,
 746         .drop_item      = &config_desc_drop,
 747 };
 748
 749 static const struct config_item_type config_desc_type = {
 750         .ct_group_ops   = &config_desc_ops,
 751         .ct_owner       = THIS_MODULE,
 752 };
 753
 754 GS_STRINGS_RW(gadget_strings, manufacturer);
 755 GS_STRINGS_RW(gadget_strings, product);
 756 GS_STRINGS_RW(gadget_strings, serialnumber);
 757
 758 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
 759         &gadget_strings_attr_manufacturer,
 760         &gadget_strings_attr_product,
 761         &gadget_strings_attr_serialnumber,
 762         NULL,
 763 };
 764
 765 static void gadget_strings_attr_release(struct config_item *item)
 766 {
 767         struct gadget_strings *gs = to_gadget_strings(item);
 768
 769         kfree(gs->manufacturer);
 770         kfree(gs->product);
 771         kfree(gs->serialnumber);
 772
 773         list_del(&gs->list);
 774         kfree(gs);
 775 }
 776
 777 USB_CONFIG_STRING_RW_OPS(gadget_strings);
 778 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
 779
 780 static inline struct gadget_info *os_desc_item_to_gadget_info(
 781                 struct config_item *item)
 782 {
 783         return container_of(to_config_group(item),
 784                         struct gadget_info, os_desc_group);
 785 }
 786
 787 static ssize_t os_desc_use_show(struct config_item *item, char *page)
 788 {
 789         return sprintf(page, "%d\n",
 790                         os_desc_item_to_gadget_info(item)->use_os_desc);
 791 }
 792
 793 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
 794                                  size_t len)
 795 {
 796         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 797         int ret;
 798         bool use;
 799
 800         mutex_lock(&gi->lock);
 801         ret = strtobool(page, &use);
 802         if (!ret) {
 803                 gi->use_os_desc = use;
 804                 ret = len;
 805         }
 806         mutex_unlock(&gi->lock);
 807
 808         return ret;
 809 }
 810
 811 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
 812 {
 813         return sprintf(page, "0x%02x\n",
 814                         os_desc_item_to_gadget_info(item)->b_vendor_code);
 815 }
 816
 817 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
 818                                            const char *page, size_t len)
 819 {
 820         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 821         int ret;
 822         u8 b_vendor_code;
 823
 824         mutex_lock(&gi->lock);
 825         ret = kstrtou8(page, 0, &b_vendor_code);
 826         if (!ret) {
 827                 gi->b_vendor_code = b_vendor_code;
 828                 ret = len;
 829         }
 830         mutex_unlock(&gi->lock);
 831
 832         return ret;
 833 }
 834
 835 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
 836 {
 837         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 838         int res;
 839
 840         res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
 841                               UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
 842         page[res++] = '\n';
 843
 844         return res;
 845 }
 846
 847 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
 848                                      size_t len)
 849 {
 850         struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 851         int res, l;
 852
 853         l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
 854         if (page[l - 1] == '\n')
 855                 --l;
 856
 857         mutex_lock(&gi->lock);
 858         res = utf8s_to_utf16s(page, l,
 859                               UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
 860                               OS_STRING_QW_SIGN_LEN);
 861         if (res > 0)
 862                 res = len;
 863         mutex_unlock(&gi->lock);
 864
 865         return res;
 866 }
 867
 868 CONFIGFS_ATTR(os_desc_, use);
 869 CONFIGFS_ATTR(os_desc_, b_vendor_code);
 870 CONFIGFS_ATTR(os_desc_, qw_sign);
 871
 872 static struct configfs_attribute *os_desc_attrs[] = {
 873         &os_desc_attr_use,
 874         &os_desc_attr_b_vendor_code,
 875         &os_desc_attr_qw_sign,
 876         NULL,
 877 };
 878
 879 static int os_desc_link(struct config_item *os_desc_ci,
 880                         struct config_item *usb_cfg_ci)
 881 {
 882         struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
 883         struct usb_composite_dev *cdev = &gi->cdev;
 884         struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci);
 885         struct usb_configuration *c;
 886         int ret;
 887
 888         mutex_lock(&gi->lock);
 889         list_for_each_entry(c, &cdev->configs, list) {
 890                 if (c == &c_target->c)
 891                         break;
 892         }
 893         if (c != &c_target->c) {
 894                 ret = -EINVAL;
 895                 goto out;
 896         }
 897
 898         if (cdev->os_desc_config) {
 899                 ret = -EBUSY;
 900                 goto out;
 901         }
 902
 903         cdev->os_desc_config = &c_target->c;
 904         ret = 0;
 905
 906 out:
 907         mutex_unlock(&gi->lock);
 908         return ret;
 909 }
 910
 911 static void os_desc_unlink(struct config_item *os_desc_ci,
 912                           struct config_item *usb_cfg_ci)
 913 {
 914         struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
 915         struct usb_composite_dev *cdev = &gi->cdev;
 916
 917         mutex_lock(&gi->lock);
 918         if (gi->composite.gadget_driver.udc_name)
 919                 unregister_gadget(gi);
 920         cdev->os_desc_config = NULL;
 921         WARN_ON(gi->composite.gadget_driver.udc_name);
 922         mutex_unlock(&gi->lock);
 923 }
 924
 925 static struct configfs_item_operations os_desc_ops = {
 926         .allow_link             = os_desc_link,
 927         .drop_link              = os_desc_unlink,
 928 };
 929
 930 static struct config_item_type os_desc_type = {
 931         .ct_item_ops    = &os_desc_ops,
 932         .ct_attrs       = os_desc_attrs,
 933         .ct_owner       = THIS_MODULE,
 934 };
 935
 936 static inline struct usb_os_desc_ext_prop
 937 *to_usb_os_desc_ext_prop(struct config_item *item)
 938 {
 939         return container_of(item, struct usb_os_desc_ext_prop, item);
 940 }
 941
 942 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
 943 {
 944         return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
 945 }
 946
 947 static ssize_t ext_prop_type_store(struct config_item *item,
 948                                    const char *page, size_t len)
 949 {
 950         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
 951         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
 952         u8 type;
 953         int ret;
 954
 955         if (desc->opts_mutex)
 956                 mutex_lock(desc->opts_mutex);
 957         ret = kstrtou8(page, 0, &type);
 958         if (ret)
 959                 goto end;
 960         if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
 961                 ret = -EINVAL;
 962                 goto end;
 963         }
 964
 965         if ((ext_prop->type == USB_EXT_PROP_BINARY ||
 966             ext_prop->type == USB_EXT_PROP_LE32 ||
 967             ext_prop->type == USB_EXT_PROP_BE32) &&
 968             (type == USB_EXT_PROP_UNICODE ||
 969             type == USB_EXT_PROP_UNICODE_ENV ||
 970             type == USB_EXT_PROP_UNICODE_LINK))
 971                 ext_prop->data_len <<= 1;
 972         else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
 973                    ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
 974                    ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
 975                    (type == USB_EXT_PROP_BINARY ||
 976                    type == USB_EXT_PROP_LE32 ||
 977                    type == USB_EXT_PROP_BE32))
 978                 ext_prop->data_len >>= 1;
 979         ext_prop->type = type;
 980         ret = len;
 981
 982 end:
 983         if (desc->opts_mutex)
 984                 mutex_unlock(desc->opts_mutex);
 985         return ret;
 986 }
 987
 988 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
 989 {
 990         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
 991         int len = ext_prop->data_len;
 992
 993         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
 994             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
 995             ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
 996                 len >>= 1;
 997         memcpy(page, ext_prop->data, len);
 998
 999         return len;
1000 }
1001
1002 static ssize_t ext_prop_data_store(struct config_item *item,
1003                                    const char *page, size_t len)
1004 {
1005         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1006         struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1007         char *new_data;
1008         size_t ret_len = len;
1009
1010         if (page[len - 1] == '\n' || page[len - 1] == '\0')
1011                 --len;
1012         new_data = kmemdup(page, len, GFP_KERNEL);
1013         if (!new_data)
1014                 return -ENOMEM;
1015
1016         if (desc->opts_mutex)
1017                 mutex_lock(desc->opts_mutex);
1018         kfree(ext_prop->data);
1019         ext_prop->data = new_data;
1020         desc->ext_prop_len -= ext_prop->data_len;
1021         ext_prop->data_len = len;
1022         desc->ext_prop_len += ext_prop->data_len;
1023         if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1024             ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1025             ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1026                 desc->ext_prop_len -= ext_prop->data_len;
1027                 ext_prop->data_len <<= 1;
1028                 ext_prop->data_len += 2;
1029                 desc->ext_prop_len += ext_prop->data_len;
1030         }
1031         if (desc->opts_mutex)
1032                 mutex_unlock(desc->opts_mutex);
1033         return ret_len;
1034 }
1035
1036 CONFIGFS_ATTR(ext_prop_, type);
1037 CONFIGFS_ATTR(ext_prop_, data);
1038
1039 static struct configfs_attribute *ext_prop_attrs[] = {
1040         &ext_prop_attr_type,
1041         &ext_prop_attr_data,
1042         NULL,
1043 };
1044
1045 static void usb_os_desc_ext_prop_release(struct config_item *item)
1046 {
1047         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1048
1049         kfree(ext_prop); /* frees a whole chunk */
1050 }
1051
1052 static struct configfs_item_operations ext_prop_ops = {
1053         .release                = usb_os_desc_ext_prop_release,
1054 };
1055
1056 static struct config_item *ext_prop_make(
1057                 struct config_group *group,
1058                 const char *name)
1059 {
1060         struct usb_os_desc_ext_prop *ext_prop;
1061         struct config_item_type *ext_prop_type;
1062         struct usb_os_desc *desc;
1063         char *vlabuf;
1064
1065         vla_group(data_chunk);
1066         vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1067         vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1068
1069         vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1070         if (!vlabuf)
1071                 return ERR_PTR(-ENOMEM);
1072
1073         ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1074         ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1075
1076         desc = container_of(group, struct usb_os_desc, group);
1077         ext_prop_type->ct_item_ops = &ext_prop_ops;
1078         ext_prop_type->ct_attrs = ext_prop_attrs;
1079         ext_prop_type->ct_owner = desc->owner;
1080
1081         config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1082
1083         ext_prop->name = kstrdup(name, GFP_KERNEL);
1084         if (!ext_prop->name) {
1085                 kfree(vlabuf);
1086                 return ERR_PTR(-ENOMEM);
1087         }
1088         desc->ext_prop_len += 14;
1089         ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1090         if (desc->opts_mutex)
1091                 mutex_lock(desc->opts_mutex);
1092         desc->ext_prop_len += ext_prop->name_len;
1093         list_add_tail(&ext_prop->entry, &desc->ext_prop);
1094         ++desc->ext_prop_count;
1095         if (desc->opts_mutex)
1096                 mutex_unlock(desc->opts_mutex);
1097
1098         return &ext_prop->item;
1099 }
1100
1101 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1102 {
1103         struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1104         struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1105
1106         if (desc->opts_mutex)
1107                 mutex_lock(desc->opts_mutex);
1108         list_del(&ext_prop->entry);
1109         --desc->ext_prop_count;
1110         kfree(ext_prop->name);
1111         desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1112         if (desc->opts_mutex)
1113                 mutex_unlock(desc->opts_mutex);
1114         config_item_put(item);
1115 }
1116
1117 static struct configfs_group_operations interf_grp_ops = {
1118         .make_item      = &ext_prop_make,
1119         .drop_item      = &ext_prop_drop,
1120 };
1121
1122 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1123                                              char *page)
1124 {
1125         memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1126         return 8;
1127 }
1128
1129 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1130                                               const char *page, size_t len)
1131 {
1132         struct usb_os_desc *desc = to_usb_os_desc(item);
1133         int l;
1134
1135         l = min_t(int, 8, len);
1136         if (page[l - 1] == '\n')
1137                 --l;
1138         if (desc->opts_mutex)
1139                 mutex_lock(desc->opts_mutex);
1140         memcpy(desc->ext_compat_id, page, l);
1141
1142         if (desc->opts_mutex)
1143                 mutex_unlock(desc->opts_mutex);
1144
1145         return len;
1146 }
1147
1148 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1149                                                  char *page)
1150 {
1151         memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1152         return 8;
1153 }
1154
1155 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1156                                                   const char *page, size_t len)
1157 {
1158         struct usb_os_desc *desc = to_usb_os_desc(item);
1159         int l;
1160
1161         l = min_t(int, 8, len);
1162         if (page[l - 1] == '\n')
1163                 --l;
1164         if (desc->opts_mutex)
1165                 mutex_lock(desc->opts_mutex);
1166         memcpy(desc->ext_compat_id + 8, page, l);
1167
1168         if (desc->opts_mutex)
1169                 mutex_unlock(desc->opts_mutex);
1170
1171         return len;
1172 }
1173
1174 CONFIGFS_ATTR(interf_grp_, compatible_id);
1175 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1176
1177 static struct configfs_attribute *interf_grp_attrs[] = {
1178         &interf_grp_attr_compatible_id,
1179         &interf_grp_attr_sub_compatible_id,
1180         NULL
1181 };
1182
1183 struct config_group *usb_os_desc_prepare_interf_dir(
1184                 struct config_group *parent,
1185                 int n_interf,
1186                 struct usb_os_desc **desc,
1187                 char **names,
1188                 struct module *owner)
1189 {
1190         struct config_group *os_desc_group;
1191         struct config_item_type *os_desc_type, *interface_type;
1192
1193         vla_group(data_chunk);
1194         vla_item(data_chunk, struct config_group, os_desc_group, 1);
1195         vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1196         vla_item(data_chunk, struct config_item_type, interface_type, 1);
1197
1198         char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1199         if (!vlabuf)
1200                 return ERR_PTR(-ENOMEM);
1201
1202         os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1203         os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1204         interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1205
1206         os_desc_type->ct_owner = owner;
1207         config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1208         configfs_add_default_group(os_desc_group, parent);
1209
1210         interface_type->ct_group_ops = &interf_grp_ops;
1211         interface_type->ct_attrs = interf_grp_attrs;
1212         interface_type->ct_owner = owner;
1213
1214         while (n_interf--) {
1215                 struct usb_os_desc *d;
1216
1217                 d = desc[n_interf];
1218                 d->owner = owner;
1219                 config_group_init_type_name(&d->group, "", interface_type);
1220                 config_item_set_name(&d->group.cg_item, "interface.%s",
1221                                      names[n_interf]);
1222                 configfs_add_default_group(&d->group, os_desc_group);
1223         }
1224
1225         return os_desc_group;
1226 }
1227 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1228
1229 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1230 {
1231         WARN_ON(1);
1232         return -EINVAL;
1233 }
1234
1235 int composite_dev_prepare(struct usb_composite_driver *composite,
1236                 struct usb_composite_dev *dev);
1237
1238 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1239                                   struct usb_ep *ep0);
1240
1241 static void purge_configs_funcs(struct gadget_info *gi)
1242 {
1243         struct usb_configuration        *c;
1244
1245         list_for_each_entry(c, &gi->cdev.configs, list) {
1246                 struct usb_function *f, *tmp;
1247                 struct config_usb_cfg *cfg;
1248
1249                 cfg = container_of(c, struct config_usb_cfg, c);
1250
1251                 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1252
1253                         list_move(&f->list, &cfg->func_list);
1254                         if (f->unbind) {
1255                                 dev_dbg(&gi->cdev.gadget->dev,
1256                                         "unbind function '%s'/%p\n",
1257                                         f->name, f);
1258                                 f->unbind(c, f);
1259                         }
1260                 }
1261                 c->next_interface_id = 0;
1262                 memset(c->interface, 0, sizeof(c->interface));
1263                 c->superspeed_plus = 0;
1264                 c->superspeed = 0;
1265                 c->highspeed = 0;
1266                 c->fullspeed = 0;
1267         }
1268 }
1269
1270 static int configfs_composite_bind(struct usb_gadget *gadget,
1271                 struct usb_gadget_driver *gdriver)
1272 {
1273         struct usb_composite_driver     *composite = to_cdriver(gdriver);
1274         struct gadget_info              *gi = container_of(composite,
1275                                                 struct gadget_info, composite);
1276         struct usb_composite_dev        *cdev = &gi->cdev;
1277         struct usb_configuration        *c;
1278         struct usb_string               *s;
1279         unsigned                        i;
1280         int                             ret;
1281
1282         /* the gi->lock is hold by the caller */
1283         gi->unbind = 0;
1284         cdev->gadget = gadget;
1285         set_gadget_data(gadget, cdev);
1286         ret = composite_dev_prepare(composite, cdev);
1287         if (ret)
1288                 return ret;
1289         /* and now the gadget bind */
1290         ret = -EINVAL;
1291
1292         if (list_empty(&gi->cdev.configs)) {
1293                 pr_err("Need at least one configuration in %s.\n",
1294                                 gi->composite.name);
1295                 goto err_comp_cleanup;
1296         }
1297
1298
1299         list_for_each_entry(c, &gi->cdev.configs, list) {
1300                 struct config_usb_cfg *cfg;
1301
1302                 cfg = container_of(c, struct config_usb_cfg, c);
1303                 if (list_empty(&cfg->func_list)) {
1304                         pr_err("Config %s/%d of %s needs at least one function.\n",
1305                               c->label, c->bConfigurationValue,
1306                               gi->composite.name);
1307                         goto err_comp_cleanup;
1308                 }
1309         }
1310
1311         /* init all strings */
1312         if (!list_empty(&gi->string_list)) {
1313                 struct gadget_strings *gs;
1314
1315                 i = 0;
1316                 list_for_each_entry(gs, &gi->string_list, list) {
1317
1318                         gi->gstrings[i] = &gs->stringtab_dev;
1319                         gs->stringtab_dev.strings = gs->strings;
1320                         gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1321                                 gs->manufacturer;
1322                         gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1323                         gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1324                         i++;
1325                 }
1326                 gi->gstrings[i] = NULL;
1327                 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1328                                 USB_GADGET_FIRST_AVAIL_IDX);
1329                 if (IS_ERR(s)) {
1330                         ret = PTR_ERR(s);
1331                         goto err_comp_cleanup;
1332                 }
1333
1334                 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1335                 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1336                 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1337         }
1338
1339         if (gi->use_os_desc) {
1340                 cdev->use_os_string = true;
1341                 cdev->b_vendor_code = gi->b_vendor_code;
1342                 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1343         }
1344
1345         if (gadget_is_otg(gadget) && !otg_desc[0]) {
1346                 struct usb_descriptor_header *usb_desc;
1347
1348                 usb_desc = usb_otg_descriptor_alloc(gadget);
1349                 if (!usb_desc) {
1350                         ret = -ENOMEM;
1351                         goto err_comp_cleanup;
1352                 }
1353                 usb_otg_descriptor_init(gadget, usb_desc);
1354                 otg_desc[0] = usb_desc;
1355                 otg_desc[1] = NULL;
1356         }
1357
1358         /* Go through all configs, attach all functions */
1359         list_for_each_entry(c, &gi->cdev.configs, list) {
1360                 struct config_usb_cfg *cfg;
1361                 struct usb_function *f;
1362                 struct usb_function *tmp;
1363                 struct gadget_config_name *cn;
1364
1365                 if (gadget_is_otg(gadget))
1366                         c->descriptors = otg_desc;
1367
1368                 cfg = container_of(c, struct config_usb_cfg, c);
1369                 if (!list_empty(&cfg->string_list)) {
1370                         i = 0;
1371                         list_for_each_entry(cn, &cfg->string_list, list) {
1372                                 cfg->gstrings[i] = &cn->stringtab_dev;
1373                                 cn->stringtab_dev.strings = &cn->strings;
1374                                 cn->strings.s = cn->configuration;
1375                                 i++;
1376                         }
1377                         cfg->gstrings[i] = NULL;
1378                         s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1379                         if (IS_ERR(s)) {
1380                                 ret = PTR_ERR(s);
1381                                 goto err_comp_cleanup;
1382                         }
1383                         c->iConfiguration = s[0].id;
1384                 }
1385
1386                 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1387                         list_del(&f->list);
1388                         ret = usb_add_function(c, f);
1389                         if (ret) {
1390                                 list_add(&f->list, &cfg->func_list);
1391                                 goto err_purge_funcs;
1392                         }
1393                 }
1394                 ret = usb_gadget_check_config(cdev->gadget);
1395                 if (ret)
1396                         goto err_purge_funcs;
1397
1398                 usb_ep_autoconfig_reset(cdev->gadget);
1399         }
1400         if (cdev->use_os_string) {
1401                 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1402                 if (ret)
1403                         goto err_purge_funcs;
1404         }
1405
1406         usb_ep_autoconfig_reset(cdev->gadget);
1407         return 0;
1408
1409 err_purge_funcs:
1410         purge_configs_funcs(gi);
1411 err_comp_cleanup:
1412         composite_dev_cleanup(cdev);
1413         return ret;
1414 }
1415
1416 static void configfs_composite_unbind(struct usb_gadget *gadget)
1417 {
1418         struct usb_composite_dev        *cdev;
1419         struct gadget_info              *gi;
1420         unsigned long flags;
1421
1422         /* the gi->lock is hold by the caller */
1423
1424         cdev = get_gadget_data(gadget);
1425         gi = container_of(cdev, struct gadget_info, cdev);
1426         spin_lock_irqsave(&gi->spinlock, flags);
1427         gi->unbind = 1;
1428         spin_unlock_irqrestore(&gi->spinlock, flags);
1429
1430         kfree(otg_desc[0]);
1431         otg_desc[0] = NULL;
1432         purge_configs_funcs(gi);
1433         composite_dev_cleanup(cdev);
1434         usb_ep_autoconfig_reset(cdev->gadget);
1435         spin_lock_irqsave(&gi->spinlock, flags);
1436         cdev->gadget = NULL;
1437         set_gadget_data(gadget, NULL);
1438         spin_unlock_irqrestore(&gi->spinlock, flags);
1439 }
1440
1441 static int configfs_composite_setup(struct usb_gadget *gadget,
1442                 const struct usb_ctrlrequest *ctrl)
1443 {
1444         struct usb_composite_dev *cdev;
1445         struct gadget_info *gi;
1446         unsigned long flags;
1447         int ret;
1448
1449         cdev = get_gadget_data(gadget);
1450         if (!cdev)
1451                 return 0;
1452
1453         gi = container_of(cdev, struct gadget_info, cdev);
1454         spin_lock_irqsave(&gi->spinlock, flags);
1455         cdev = get_gadget_data(gadget);
1456         if (!cdev || gi->unbind) {
1457                 spin_unlock_irqrestore(&gi->spinlock, flags);
1458                 return 0;
1459         }
1460
1461         ret = composite_setup(gadget, ctrl);
1462         spin_unlock_irqrestore(&gi->spinlock, flags);
1463         return ret;
1464 }
1465
1466 static void configfs_composite_disconnect(struct usb_gadget *gadget)
1467 {
1468         struct usb_composite_dev *cdev;
1469         struct gadget_info *gi;
1470         unsigned long flags;
1471
1472         cdev = get_gadget_data(gadget);
1473         if (!cdev)
1474                 return;
1475
1476         gi = container_of(cdev, struct gadget_info, cdev);
1477         spin_lock_irqsave(&gi->spinlock, flags);
1478         cdev = get_gadget_data(gadget);
1479         if (!cdev || gi->unbind) {
1480                 spin_unlock_irqrestore(&gi->spinlock, flags);
1481                 return;
1482         }
1483
1484         composite_disconnect(gadget);
1485         spin_unlock_irqrestore(&gi->spinlock, flags);
1486 }
1487
1488 static void configfs_composite_reset(struct usb_gadget *gadget)
1489 {
1490         struct usb_composite_dev *cdev;
1491         struct gadget_info *gi;
1492         unsigned long flags;
1493
1494         cdev = get_gadget_data(gadget);
1495         if (!cdev)
1496                 return;
1497
1498         gi = container_of(cdev, struct gadget_info, cdev);
1499         spin_lock_irqsave(&gi->spinlock, flags);
1500         cdev = get_gadget_data(gadget);
1501         if (!cdev || gi->unbind) {
1502                 spin_unlock_irqrestore(&gi->spinlock, flags);
1503                 return;
1504         }
1505
1506         composite_reset(gadget);
1507         spin_unlock_irqrestore(&gi->spinlock, flags);
1508 }
1509
1510 static void configfs_composite_suspend(struct usb_gadget *gadget)
1511 {
1512         struct usb_composite_dev *cdev;
1513         struct gadget_info *gi;
1514         unsigned long flags;
1515
1516         cdev = get_gadget_data(gadget);
1517         if (!cdev)
1518                 return;
1519
1520         gi = container_of(cdev, struct gadget_info, cdev);
1521         spin_lock_irqsave(&gi->spinlock, flags);
1522         cdev = get_gadget_data(gadget);
1523         if (!cdev || gi->unbind) {
1524                 spin_unlock_irqrestore(&gi->spinlock, flags);
1525                 return;
1526         }
1527
1528         composite_suspend(gadget);
1529         spin_unlock_irqrestore(&gi->spinlock, flags);
1530 }
1531
1532 static void configfs_composite_resume(struct usb_gadget *gadget)
1533 {
1534         struct usb_composite_dev *cdev;
1535         struct gadget_info *gi;
1536         unsigned long flags;
1537
1538         cdev = get_gadget_data(gadget);
1539         if (!cdev)
1540                 return;
1541
1542         gi = container_of(cdev, struct gadget_info, cdev);
1543         spin_lock_irqsave(&gi->spinlock, flags);
1544         cdev = get_gadget_data(gadget);
1545         if (!cdev || gi->unbind) {
1546                 spin_unlock_irqrestore(&gi->spinlock, flags);
1547                 return;
1548         }
1549
1550         composite_resume(gadget);
1551         spin_unlock_irqrestore(&gi->spinlock, flags);
1552 }
1553
1554 static const struct usb_gadget_driver configfs_driver_template = {
1555         .bind           = configfs_composite_bind,
1556         .unbind         = configfs_composite_unbind,
1557
1558         .setup          = configfs_composite_setup,
1559         .reset          = configfs_composite_reset,
1560         .disconnect     = configfs_composite_disconnect,
1561
1562         .suspend        = configfs_composite_suspend,
1563         .resume         = configfs_composite_resume,
1564
1565         .max_speed      = USB_SPEED_SUPER_PLUS,
1566         .driver = {
1567                 .owner          = THIS_MODULE,
1568                 .name           = "configfs-gadget",
1569         },
1570         .match_existing_only = 1,
1571 };
1572
1573 static struct config_group *gadgets_make(
1574                 struct config_group *group,
1575                 const char *name)
1576 {
1577         struct gadget_info *gi;
1578
1579         gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1580         if (!gi)
1581                 return ERR_PTR(-ENOMEM);
1582
1583         config_group_init_type_name(&gi->group, name, &gadget_root_type);
1584
1585         config_group_init_type_name(&gi->functions_group, "functions",
1586                         &functions_type);
1587         configfs_add_default_group(&gi->functions_group, &gi->group);
1588
1589         config_group_init_type_name(&gi->configs_group, "configs",
1590                         &config_desc_type);
1591         configfs_add_default_group(&gi->configs_group, &gi->group);
1592
1593         config_group_init_type_name(&gi->strings_group, "strings",
1594                         &gadget_strings_strings_type);
1595         configfs_add_default_group(&gi->strings_group, &gi->group);
1596
1597         config_group_init_type_name(&gi->os_desc_group, "os_desc",
1598                         &os_desc_type);
1599         configfs_add_default_group(&gi->os_desc_group, &gi->group);
1600
1601         gi->composite.bind = configfs_do_nothing;
1602         gi->composite.unbind = configfs_do_nothing;
1603         gi->composite.suspend = NULL;
1604         gi->composite.resume = NULL;
1605         gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
1606
1607         spin_lock_init(&gi->spinlock);
1608         mutex_init(&gi->lock);
1609         INIT_LIST_HEAD(&gi->string_list);
1610         INIT_LIST_HEAD(&gi->available_func);
1611
1612         composite_init_dev(&gi->cdev);
1613         gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1614         gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1615         gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1616
1617         gi->composite.gadget_driver = configfs_driver_template;
1618
1619         gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1620         gi->composite.name = gi->composite.gadget_driver.function;
1621
1622         if (!gi->composite.gadget_driver.function)
1623                 goto err;
1624
1625         return &gi->group;
1626 err:
1627         kfree(gi);
1628         return ERR_PTR(-ENOMEM);
1629 }
1630
1631 static void gadgets_drop(struct config_group *group, struct config_item *item)
1632 {
1633         config_item_put(item);
1634 }
1635
1636 static struct configfs_group_operations gadgets_ops = {
1637         .make_group     = &gadgets_make,
1638         .drop_item      = &gadgets_drop,
1639 };
1640
1641 static const struct config_item_type gadgets_type = {
1642         .ct_group_ops   = &gadgets_ops,
1643         .ct_owner       = THIS_MODULE,
1644 };
1645
1646 static struct configfs_subsystem gadget_subsys = {
1647         .su_group = {
1648                 .cg_item = {
1649                         .ci_namebuf = "usb_gadget",
1650                         .ci_type = &gadgets_type,
1651                 },
1652         },
1653         .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1654 };
1655
1656 void unregister_gadget_item(struct config_item *item)
1657 {
1658         struct gadget_info *gi = to_gadget_info(item);
1659
1660         mutex_lock(&gi->lock);
1661         unregister_gadget(gi);
1662         mutex_unlock(&gi->lock);
1663 }
1664 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1665
1666 static int __init gadget_cfs_init(void)
1667 {
1668         int ret;
1669
1670         config_group_init(&gadget_subsys.su_group);
1671
1672         ret = configfs_register_subsystem(&gadget_subsys);
1673         return ret;
1674 }
1675 module_init(gadget_cfs_init);
1676
1677 static void __exit gadget_cfs_exit(void)
1678 {
1679         configfs_unregister_subsystem(&gadget_subsys);
1680 }
1681 module_exit(gadget_cfs_exit);