linux/drivers/usb/gadget/configfs.c
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   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
  13int check_user_usb_string(const char *name,
  14                struct usb_gadget_strings *stringtab_dev)
  15{
  16        unsigned primary_lang;
  17        unsigned sub_lang;
  18        u16 num;
  19        int ret;
  20
  21        ret = kstrtou16(name, 0, &num);
  22        if (ret)
  23                return ret;
  24
  25        primary_lang = num & 0x3ff;
  26        sub_lang = num >> 10;
  27
  28        /* simple sanity check for valid langid */
  29        switch (primary_lang) {
  30        case 0:
  31        case 0x62 ... 0xfe:
  32        case 0x100 ... 0x3ff:
  33                return -EINVAL;
  34        }
  35        if (!sub_lang)
  36                return -EINVAL;
  37
  38        stringtab_dev->language = num;
  39        return 0;
  40}
  41
  42#define MAX_NAME_LEN    40
  43#define MAX_USB_STRING_LANGS 2
  44
  45static const struct usb_descriptor_header *otg_desc[2];
  46
  47struct gadget_info {
  48        struct config_group group;
  49        struct config_group functions_group;
  50        struct config_group configs_group;
  51        struct config_group strings_group;
  52        struct config_group os_desc_group;
  53
  54        struct mutex lock;
  55        struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
  56        struct list_head string_list;
  57        struct list_head available_func;
  58
  59        struct usb_composite_driver composite;
  60        struct usb_composite_dev cdev;
  61        bool use_os_desc;
  62        char b_vendor_code;
  63        char qw_sign[OS_STRING_QW_SIGN_LEN];
  64        spinlock_t spinlock;
  65        bool unbind;
  66};
  67
  68static inline struct gadget_info *to_gadget_info(struct config_item *item)
  69{
  70         return container_of(to_config_group(item), struct gadget_info, group);
  71}
  72
  73struct config_usb_cfg {
  74        struct config_group group;
  75        struct config_group strings_group;
  76        struct list_head string_list;
  77        struct usb_configuration c;
  78        struct list_head func_list;
  79        struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
  80};
  81
  82static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
  83{
  84        return container_of(to_config_group(item), struct config_usb_cfg,
  85                        group);
  86}
  87
  88struct gadget_strings {
  89        struct usb_gadget_strings stringtab_dev;
  90        struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
  91        char *manufacturer;
  92        char *product;
  93        char *serialnumber;
  94
  95        struct config_group group;
  96        struct list_head list;
  97};
  98
  99struct os_desc {
 100        struct config_group group;
 101};
 102
 103struct gadget_config_name {
 104        struct usb_gadget_strings stringtab_dev;
 105        struct usb_string strings;
 106        char *configuration;
 107
 108        struct config_group group;
 109        struct list_head list;
 110};
 111
 112static int usb_string_copy(const char *s, char **s_copy)
 113{
 114        int ret;
 115        char *str;
 116        char *copy = *s_copy;
 117        ret = strlen(s);
 118        if (ret > 126)
 119                return -EOVERFLOW;
 120
 121        str = kstrdup(s, GFP_KERNEL);
 122        if (!str)
 123                return -ENOMEM;
 124        if (str[ret - 1] == '\n')
 125                str[ret - 1] = '\0';
 126        kfree(copy);
 127        *s_copy = str;
 128        return 0;
 129}
 130
 131#define GI_DEVICE_DESC_SIMPLE_R_u8(__name)      \
 132static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
 133                        char *page)     \
 134{       \
 135        return sprintf(page, "0x%02x\n", \
 136                to_gadget_info(item)->cdev.desc.__name); \
 137}
 138
 139#define GI_DEVICE_DESC_SIMPLE_R_u16(__name)     \
 140static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
 141                        char *page)     \
 142{       \
 143        return sprintf(page, "0x%04x\n", \
 144                le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
 145}
 146
 147
 148#define GI_DEVICE_DESC_SIMPLE_W_u8(_name)               \
 149static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 150                const char *page, size_t len)           \
 151{                                                       \
 152        u8 val;                                         \
 153        int ret;                                        \
 154        ret = kstrtou8(page, 0, &val);                  \
 155        if (ret)                                        \
 156                return ret;                             \
 157        to_gadget_info(item)->cdev.desc._name = val;    \
 158        return len;                                     \
 159}
 160
 161#define GI_DEVICE_DESC_SIMPLE_W_u16(_name)      \
 162static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 163                const char *page, size_t len)           \
 164{                                                       \
 165        u16 val;                                        \
 166        int ret;                                        \
 167        ret = kstrtou16(page, 0, &val);                 \
 168        if (ret)                                        \
 169                return ret;                             \
 170        to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val);     \
 171        return len;                                     \
 172}
 173
 174#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type)  \
 175        GI_DEVICE_DESC_SIMPLE_R_##_type(_name)  \
 176        GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
 177
 178GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
 179GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
 180GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
 181GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
 182GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
 183GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
 184GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
 185GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
 186
 187static ssize_t is_valid_bcd(u16 bcd_val)
 188{
 189        if ((bcd_val & 0xf) > 9)
 190                return -EINVAL;
 191        if (((bcd_val >> 4) & 0xf) > 9)
 192                return -EINVAL;
 193        if (((bcd_val >> 8) & 0xf) > 9)
 194                return -EINVAL;
 195        if (((bcd_val >> 12) & 0xf) > 9)
 196                return -EINVAL;
 197        return 0;
 198}
 199
 200static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
 201                const char *page, size_t len)
 202{
 203        u16 bcdDevice;
 204        int ret;
 205
 206        ret = kstrtou16(page, 0, &bcdDevice);
 207        if (ret)
 208                return ret;
 209        ret = is_valid_bcd(bcdDevice);
 210        if (ret)
 211                return ret;
 212
 213        to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
 214        return len;
 215}
 216
 217static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
 218                const char *page, size_t len)
 219{
 220        u16 bcdUSB;
 221        int ret;
 222
 223        ret = kstrtou16(page, 0, &bcdUSB);
 224        if (ret)
 225                return ret;
 226        ret = is_valid_bcd(bcdUSB);
 227        if (ret)
 228                return ret;
 229
 230        to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
 231        return len;
 232}
 233
 234static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
 235{
 236        char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name;
 237
 238        return sprintf(page, "%s\n", udc_name ?: "");
 239}
 240
 241static int unregister_gadget(struct gadget_info *gi)
 242{
 243        int ret;
 244
 245        if (!gi->composite.gadget_driver.udc_name)
 246                return -ENODEV;
 247
 248        ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
 249        if (ret)
 250                return ret;
 251        kfree(gi->composite.gadget_driver.udc_name);
 252        gi->composite.gadget_driver.udc_name = NULL;
 253        return 0;
 254}
 255
 256static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
 257                const char *page, size_t len)
 258{
 259        struct gadget_info *gi = to_gadget_info(item);
 260        char *name;
 261        int ret;
 262
 263        name = kstrdup(page, GFP_KERNEL);
 264        if (!name)
 265                return -ENOMEM;
 266        if (name[len - 1] == '\n')
 267                name[len - 1] = '\0';
 268
 269        mutex_lock(&gi->lock);
 270
 271        if (!strlen(name)) {
 272                ret = unregister_gadget(gi);
 273                if (ret)
 274                        goto err;
 275                kfree(name);
 276        } else {
 277                if (gi->composite.gadget_driver.udc_name) {
 278                        ret = -EBUSY;
 279                        goto err;
 280                }
 281                gi->composite.gadget_driver.udc_name = name;
 282                ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
 283                if (ret) {
 284                        gi->composite.gadget_driver.udc_name = NULL;
 285                        goto err;
 286                }
 287        }
 288        mutex_unlock(&gi->lock);
 289        return len;
 290err:
 291        kfree(name);
 292        mutex_unlock(&gi->lock);
 293        return ret;
 294}
 295
 296CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
 297CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
 298CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
 299CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
 300CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
 301CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
 302CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
 303CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
 304CONFIGFS_ATTR(gadget_dev_desc_, UDC);
 305
 306static struct configfs_attribute *gadget_root_attrs[] = {
 307        &gadget_dev_desc_attr_bDeviceClass,
 308        &gadget_dev_desc_attr_bDeviceSubClass,
 309        &gadget_dev_desc_attr_bDeviceProtocol,
 310        &gadget_dev_desc_attr_bMaxPacketSize0,
 311        &gadget_dev_desc_attr_idVendor,
 312        &gadget_dev_desc_attr_idProduct,
 313        &gadget_dev_desc_attr_bcdDevice,
 314        &gadget_dev_desc_attr_bcdUSB,
 315        &gadget_dev_desc_attr_UDC,
 316        NULL,
 317};
 318
 319static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
 320{
 321         return container_of(to_config_group(item), struct gadget_strings,
 322                         group);
 323}
 324
 325static inline struct gadget_config_name *to_gadget_config_name(
 326                struct config_item *item)
 327{
 328         return container_of(to_config_group(item), struct gadget_config_name,
 329                         group);
 330}
 331
 332static inline struct usb_function_instance *to_usb_function_instance(
 333                struct config_item *item)
 334{
 335         return container_of(to_config_group(item),
 336                         struct usb_function_instance, group);
 337}
 338
 339static void gadget_info_attr_release(struct config_item *item)
 340{
 341        struct gadget_info *gi = to_gadget_info(item);
 342
 343        WARN_ON(!list_empty(&gi->cdev.configs));
 344        WARN_ON(!list_empty(&gi->string_list));
 345        WARN_ON(!list_empty(&gi->available_func));
 346        kfree(gi->composite.gadget_driver.function);
 347        kfree(gi);
 348}
 349
 350static struct configfs_item_operations gadget_root_item_ops = {
 351        .release                = gadget_info_attr_release,
 352};
 353
 354static void gadget_config_attr_release(struct config_item *item)
 355{
 356        struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 357
 358        WARN_ON(!list_empty(&cfg->c.functions));
 359        list_del(&cfg->c.list);
 360        kfree(cfg->c.label);
 361        kfree(cfg);
 362}
 363
 364static int config_usb_cfg_link(
 365        struct config_item *usb_cfg_ci,
 366        struct config_item *usb_func_ci)
 367{
 368        struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 369        struct usb_composite_dev *cdev = cfg->c.cdev;
 370        struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
 371
 372        struct config_group *group = to_config_group(usb_func_ci);
 373        struct usb_function_instance *fi = container_of(group,
 374                        struct usb_function_instance, group);
 375        struct usb_function_instance *a_fi;
 376        struct usb_function *f;
 377        int ret;
 378
 379        mutex_lock(&gi->lock);
 380        /*
 381         * Make sure this function is from within our _this_ gadget and not
 382         * from another gadget or a random directory.
 383         * Also a function instance can only be linked once.
 384         */
 385        list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
 386                if (a_fi == fi)
 387                        break;
 388        }
 389        if (a_fi != fi) {
 390                ret = -EINVAL;
 391                goto out;
 392        }
 393
 394        list_for_each_entry(f, &cfg->func_list, list) {
 395                if (f->fi == fi) {
 396                        ret = -EEXIST;
 397                        goto out;
 398                }
 399        }
 400
 401        f = usb_get_function(fi);
 402        if (IS_ERR(f)) {
 403                ret = PTR_ERR(f);
 404                goto out;
 405        }
 406
 407        /* stash the function until we bind it to the gadget */
 408        list_add_tail(&f->list, &cfg->func_list);
 409        ret = 0;
 410out:
 411        mutex_unlock(&gi->lock);
 412        return ret;
 413}
 414
 415static void config_usb_cfg_unlink(
 416        struct config_item *usb_cfg_ci,
 417        struct config_item *usb_func_ci)
 418{
 419        struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
 420        struct usb_composite_dev *cdev = cfg->c.cdev;
 421        struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
 422
 423        struct config_group *group = to_config_group(usb_func_ci);
 424        struct usb_function_instance *fi = container_of(group,
 425                        struct usb_function_instance, group);
 426        struct usb_function *f;
 427
 428        /*
 429         * ideally I would like to forbid to unlink functions while a gadget is
 430         * bound to an UDC. Since this isn't possible at the moment, we simply
 431         * force an unbind, the function is available here and then we can
 432         * remove the function.
 433         */
 434        mutex_lock(&gi->lock);
 435        if (gi->composite.gadget_driver.udc_name)
 436                unregister_gadget(gi);
 437        WARN_ON(gi->composite.gadget_driver.udc_name);
 438
 439        list_for_each_entry(f, &cfg->func_list, list) {
 440                if (f->fi == fi) {
 441                        list_del(&f->list);
 442                        usb_put_function(f);
 443                        mutex_unlock(&gi->lock);
 444                        return;
 445                }
 446        }
 447        mutex_unlock(&gi->lock);
 448        WARN(1, "Unable to locate function to unbind\n");
 449}
 450
 451static struct configfs_item_operations gadget_config_item_ops = {
 452        .release                = gadget_config_attr_release,
 453        .allow_link             = config_usb_cfg_link,
 454        .drop_link              = config_usb_cfg_unlink,
 455};
 456
 457
 458static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
 459                char *page)
 460{
 461        return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
 462}
 463
 464static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
 465                const char *page, size_t len)
 466{
 467        u16 val;
 468        int ret;
 469        ret = kstrtou16(page, 0, &val);
 470        if (ret)
 471                return ret;
 472        if (DIV_ROUND_UP(val, 8) > 0xff)
 473                return -ERANGE;
 474        to_config_usb_cfg(item)->c.MaxPower = val;
 475        return len;
 476}
 477
 478static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
 479                char *page)
 480{
 481        return sprintf(page, "0x%02x\n",
 482                to_config_usb_cfg(item)->c.bmAttributes);
 483}
 484
 485static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
 486                const char *page, size_t len)
 487{
 488        u8 val;
 489        int ret;
 490        ret = kstrtou8(page, 0, &val);
 491        if (ret)
 492                return ret;
 493        if (!(val & USB_CONFIG_ATT_ONE))
 494                return -EINVAL;
 495        if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
 496                                USB_CONFIG_ATT_WAKEUP))
 497                return -EINVAL;
 498        to_config_usb_cfg(item)->c.bmAttributes = val;
 499        return len;
 500}
 501
 502CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
 503CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
 504
 505static struct configfs_attribute *gadget_config_attrs[] = {
 506        &gadget_config_desc_attr_MaxPower,
 507        &gadget_config_desc_attr_bmAttributes,
 508        NULL,
 509};
 510
 511static const struct config_item_type gadget_config_type = {
 512        .ct_item_ops    = &gadget_config_item_ops,
 513        .ct_attrs       = gadget_config_attrs,
 514        .ct_owner       = THIS_MODULE,
 515};
 516
 517static const struct config_item_type gadget_root_type = {
 518        .ct_item_ops    = &gadget_root_item_ops,
 519        .ct_attrs       = gadget_root_attrs,
 520        .ct_owner       = THIS_MODULE,
 521};
 522
 523static void composite_init_dev(struct usb_composite_dev *cdev)
 524{
 525        spin_lock_init(&cdev->lock);
 526        INIT_LIST_HEAD(&cdev->configs);
 527        INIT_LIST_HEAD(&cdev->gstrings);
 528}
 529
 530static struct config_group *function_make(
 531                struct config_group *group,
 532                const char *name)
 533{
 534        struct gadget_info *gi;
 535        struct usb_function_instance *fi;
 536        char buf[MAX_NAME_LEN];
 537        char *func_name;
 538        char *instance_name;
 539        int ret;
 540
 541        ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
 542        if (ret >= MAX_NAME_LEN)
 543                return ERR_PTR(-ENAMETOOLONG);
 544
 545        func_name = buf;
 546        instance_name = strchr(func_name, '.');
 547        if (!instance_name) {
 548                pr_err("Unable to locate . in FUNC.INSTANCE\n");
 549                return ERR_PTR(-EINVAL);
 550        }
 551        *instance_name = '\0';
 552        instance_name++;
 553
 554        fi = usb_get_function_instance(func_name);
 555        if (IS_ERR(fi))
 556                return ERR_CAST(fi);
 557
 558        ret = config_item_set_name(&fi->group.cg_item, "%s", name);
 559        if (ret) {
 560                usb_put_function_instance(fi);
 561                return ERR_PTR(ret);
 562        }
 563        if (fi->set_inst_name) {
 564                ret = fi->set_inst_name(fi, instance_name);
 565                if (ret) {
 566                        usb_put_function_instance(fi);
 567                        return ERR_PTR(ret);
 568                }
 569        }
 570
 571        gi = container_of(group, struct gadget_info, functions_group);
 572
 573        mutex_lock(&gi->lock);
 574        list_add_tail(&fi->cfs_list, &gi->available_func);
 575        mutex_unlock(&gi->lock);
 576        return &fi->group;
 577}
 578
 579static void function_drop(
 580                struct config_group *group,
 581                struct config_item *item)
 582{
 583        struct usb_function_instance *fi = to_usb_function_instance(item);
 584        struct gadget_info *gi;
 585
 586        gi = container_of(group, struct gadget_info, functions_group);
 587
 588        mutex_lock(&gi->lock);
 589        list_del(&fi->cfs_list);
 590        mutex_unlock(&gi->lock);
 591        config_item_put(item);
 592}
 593
 594static struct configfs_group_operations functions_ops = {
 595        .make_group     = &function_make,
 596        .drop_item      = &function_drop,
 597};
 598
 599static const struct config_item_type functions_type = {
 600        .ct_group_ops   = &functions_ops,
 601        .ct_owner       = THIS_MODULE,
 602};
 603
 604GS_STRINGS_RW(gadget_config_name, configuration);
 605
 606static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
 607        &gadget_config_name_attr_configuration,
 608        NULL,
 609};
 610
 611static void gadget_config_name_attr_release(struct config_item *item)
 612{
 613        struct gadget_config_name *cn = to_gadget_config_name(item);
 614
 615        kfree(cn->configuration);
 616
 617        list_del(&cn->list);
 618        kfree(cn);
 619}
 620
 621USB_CONFIG_STRING_RW_OPS(gadget_config_name);
 622USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
 623
 624static struct config_group *config_desc_make(
 625                struct config_group *group,
 626                const char *name)
 627{
 628        struct gadget_info *gi;
 629        struct config_usb_cfg *cfg;
 630        char buf[MAX_NAME_LEN];
 631        char *num_str;
 632        u8 num;
 633        int ret;
 634
 635        gi = container_of(group, struct gadget_info, configs_group);
 636        ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
 637        if (ret >= MAX_NAME_LEN)
 638                return ERR_PTR(-ENAMETOOLONG);
 639
 640        num_str = strchr(buf, '.');
 641        if (!num_str) {
 642                pr_err("Unable to locate . in name.bConfigurationValue\n");
 643                return ERR_PTR(-EINVAL);
 644        }
 645
 646        *num_str = '\0';
 647        num_str++;
 648
 649        if (!strlen(buf))
 650                return ERR_PTR(-EINVAL);
 651
 652        ret = kstrtou8(num_str, 0, &num);
 653        if (ret)
 654                return ERR_PTR(ret);
 655
 656        cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 657        if (!cfg)
 658                return ERR_PTR(-ENOMEM);
 659        cfg->c.label = kstrdup(buf, GFP_KERNEL);
 660        if (!cfg->c.label) {
 661                ret = -ENOMEM;
 662                goto err;
 663        }
 664        cfg->c.bConfigurationValue = num;
 665        cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
 666        cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
 667        INIT_LIST_HEAD(&cfg->string_list);
 668        INIT_LIST_HEAD(&cfg->func_list);
 669
 670        config_group_init_type_name(&cfg->group, name,
 671                                &gadget_config_type);
 672
 673        config_group_init_type_name(&cfg->strings_group, "strings",
 674                        &gadget_config_name_strings_type);
 675        configfs_add_default_group(&cfg->strings_group, &cfg->group);
 676
 677        ret = usb_add_config_only(&gi->cdev, &cfg->c);
 678        if (ret)
 679                goto err;
 680
 681        return &cfg->group;
 682err:
 683        kfree(cfg->c.label);
 684        kfree(cfg);
 685        return ERR_PTR(ret);
 686}
 687
 688static void config_desc_drop(
 689                struct config_group *group,
 690                struct config_item *item)
 691{
 692        config_item_put(item);
 693}
 694
 695static struct configfs_group_operations config_desc_ops = {
 696        .make_group     = &config_desc_make,
 697        .drop_item      = &config_desc_drop,
 698};
 699
 700static const struct config_item_type config_desc_type = {
 701        .ct_group_ops   = &config_desc_ops,
 702        .ct_owner       = THIS_MODULE,
 703};
 704
 705GS_STRINGS_RW(gadget_strings, manufacturer);
 706GS_STRINGS_RW(gadget_strings, product);
 707GS_STRINGS_RW(gadget_strings, serialnumber);
 708
 709static struct configfs_attribute *gadget_strings_langid_attrs[] = {
 710        &gadget_strings_attr_manufacturer,
 711        &gadget_strings_attr_product,
 712        &gadget_strings_attr_serialnumber,
 713        NULL,
 714};
 715
 716static void gadget_strings_attr_release(struct config_item *item)
 717{
 718        struct gadget_strings *gs = to_gadget_strings(item);
 719
 720        kfree(gs->manufacturer);
 721        kfree(gs->product);
 722        kfree(gs->serialnumber);
 723
 724        list_del(&gs->list);
 725        kfree(gs);
 726}
 727
 728USB_CONFIG_STRING_RW_OPS(gadget_strings);
 729USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
 730
 731static inline struct os_desc *to_os_desc(struct config_item *item)
 732{
 733        return container_of(to_config_group(item), struct os_desc, group);
 734}
 735
 736static inline struct gadget_info *os_desc_item_to_gadget_info(
 737                struct config_item *item)
 738{
 739        return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
 740}
 741
 742static ssize_t os_desc_use_show(struct config_item *item, char *page)
 743{
 744        return sprintf(page, "%d\n",
 745                        os_desc_item_to_gadget_info(item)->use_os_desc);
 746}
 747
 748static ssize_t os_desc_use_store(struct config_item *item, const char *page,
 749                                 size_t len)
 750{
 751        struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 752        int ret;
 753        bool use;
 754
 755        mutex_lock(&gi->lock);
 756        ret = strtobool(page, &use);
 757        if (!ret) {
 758                gi->use_os_desc = use;
 759                ret = len;
 760        }
 761        mutex_unlock(&gi->lock);
 762
 763        return ret;
 764}
 765
 766static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
 767{
 768        return sprintf(page, "0x%02x\n",
 769                        os_desc_item_to_gadget_info(item)->b_vendor_code);
 770}
 771
 772static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
 773                                           const char *page, size_t len)
 774{
 775        struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 776        int ret;
 777        u8 b_vendor_code;
 778
 779        mutex_lock(&gi->lock);
 780        ret = kstrtou8(page, 0, &b_vendor_code);
 781        if (!ret) {
 782                gi->b_vendor_code = b_vendor_code;
 783                ret = len;
 784        }
 785        mutex_unlock(&gi->lock);
 786
 787        return ret;
 788}
 789
 790static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
 791{
 792        struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 793        int res;
 794
 795        res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
 796                              UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
 797        page[res++] = '\n';
 798
 799        return res;
 800}
 801
 802static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
 803                                     size_t len)
 804{
 805        struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 806        int res, l;
 807
 808        l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
 809        if (page[l - 1] == '\n')
 810                --l;
 811
 812        mutex_lock(&gi->lock);
 813        res = utf8s_to_utf16s(page, l,
 814                              UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
 815                              OS_STRING_QW_SIGN_LEN);
 816        if (res > 0)
 817                res = len;
 818        mutex_unlock(&gi->lock);
 819
 820        return res;
 821}
 822
 823CONFIGFS_ATTR(os_desc_, use);
 824CONFIGFS_ATTR(os_desc_, b_vendor_code);
 825CONFIGFS_ATTR(os_desc_, qw_sign);
 826
 827static struct configfs_attribute *os_desc_attrs[] = {
 828        &os_desc_attr_use,
 829        &os_desc_attr_b_vendor_code,
 830        &os_desc_attr_qw_sign,
 831        NULL,
 832};
 833
 834static void os_desc_attr_release(struct config_item *item)
 835{
 836        struct os_desc *os_desc = to_os_desc(item);
 837        kfree(os_desc);
 838}
 839
 840static int os_desc_link(struct config_item *os_desc_ci,
 841                        struct config_item *usb_cfg_ci)
 842{
 843        struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
 844                                        struct gadget_info, os_desc_group);
 845        struct usb_composite_dev *cdev = &gi->cdev;
 846        struct config_usb_cfg *c_target =
 847                container_of(to_config_group(usb_cfg_ci),
 848                             struct config_usb_cfg, group);
 849        struct usb_configuration *c;
 850        int ret;
 851
 852        mutex_lock(&gi->lock);
 853        list_for_each_entry(c, &cdev->configs, list) {
 854                if (c == &c_target->c)
 855                        break;
 856        }
 857        if (c != &c_target->c) {
 858                ret = -EINVAL;
 859                goto out;
 860        }
 861
 862        if (cdev->os_desc_config) {
 863                ret = -EBUSY;
 864                goto out;
 865        }
 866
 867        cdev->os_desc_config = &c_target->c;
 868        ret = 0;
 869
 870out:
 871        mutex_unlock(&gi->lock);
 872        return ret;
 873}
 874
 875static void os_desc_unlink(struct config_item *os_desc_ci,
 876                          struct config_item *usb_cfg_ci)
 877{
 878        struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
 879                                        struct gadget_info, os_desc_group);
 880        struct usb_composite_dev *cdev = &gi->cdev;
 881
 882        mutex_lock(&gi->lock);
 883        if (gi->composite.gadget_driver.udc_name)
 884                unregister_gadget(gi);
 885        cdev->os_desc_config = NULL;
 886        WARN_ON(gi->composite.gadget_driver.udc_name);
 887        mutex_unlock(&gi->lock);
 888}
 889
 890static struct configfs_item_operations os_desc_ops = {
 891        .release                = os_desc_attr_release,
 892        .allow_link             = os_desc_link,
 893        .drop_link              = os_desc_unlink,
 894};
 895
 896static struct config_item_type os_desc_type = {
 897        .ct_item_ops    = &os_desc_ops,
 898        .ct_attrs       = os_desc_attrs,
 899        .ct_owner       = THIS_MODULE,
 900};
 901
 902static inline struct usb_os_desc_ext_prop
 903*to_usb_os_desc_ext_prop(struct config_item *item)
 904{
 905        return container_of(item, struct usb_os_desc_ext_prop, item);
 906}
 907
 908static ssize_t ext_prop_type_show(struct config_item *item, char *page)
 909{
 910        return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
 911}
 912
 913static ssize_t ext_prop_type_store(struct config_item *item,
 914                                   const char *page, size_t len)
 915{
 916        struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
 917        struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
 918        u8 type;
 919        int ret;
 920
 921        if (desc->opts_mutex)
 922                mutex_lock(desc->opts_mutex);
 923        ret = kstrtou8(page, 0, &type);
 924        if (ret)
 925                goto end;
 926        if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
 927                ret = -EINVAL;
 928                goto end;
 929        }
 930
 931        if ((ext_prop->type == USB_EXT_PROP_BINARY ||
 932            ext_prop->type == USB_EXT_PROP_LE32 ||
 933            ext_prop->type == USB_EXT_PROP_BE32) &&
 934            (type == USB_EXT_PROP_UNICODE ||
 935            type == USB_EXT_PROP_UNICODE_ENV ||
 936            type == USB_EXT_PROP_UNICODE_LINK))
 937                ext_prop->data_len <<= 1;
 938        else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
 939                   ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
 940                   ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
 941                   (type == USB_EXT_PROP_BINARY ||
 942                   type == USB_EXT_PROP_LE32 ||
 943                   type == USB_EXT_PROP_BE32))
 944                ext_prop->data_len >>= 1;
 945        ext_prop->type = type;
 946        ret = len;
 947
 948end:
 949        if (desc->opts_mutex)
 950                mutex_unlock(desc->opts_mutex);
 951        return ret;
 952}
 953
 954static ssize_t ext_prop_data_show(struct config_item *item, char *page)
 955{
 956        struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
 957        int len = ext_prop->data_len;
 958
 959        if (ext_prop->type == USB_EXT_PROP_UNICODE ||
 960            ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
 961            ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
 962                len >>= 1;
 963        memcpy(page, ext_prop->data, len);
 964
 965        return len;
 966}
 967
 968static ssize_t ext_prop_data_store(struct config_item *item,
 969                                   const char *page, size_t len)
 970{
 971        struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
 972        struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
 973        char *new_data;
 974        size_t ret_len = len;
 975
 976        if (page[len - 1] == '\n' || page[len - 1] == '\0')
 977                --len;
 978        new_data = kmemdup(page, len, GFP_KERNEL);
 979        if (!new_data)
 980                return -ENOMEM;
 981
 982        if (desc->opts_mutex)
 983                mutex_lock(desc->opts_mutex);
 984        kfree(ext_prop->data);
 985        ext_prop->data = new_data;
 986        desc->ext_prop_len -= ext_prop->data_len;
 987        ext_prop->data_len = len;
 988        desc->ext_prop_len += ext_prop->data_len;
 989        if (ext_prop->type == USB_EXT_PROP_UNICODE ||
 990            ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
 991            ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
 992                desc->ext_prop_len -= ext_prop->data_len;
 993                ext_prop->data_len <<= 1;
 994                ext_prop->data_len += 2;
 995                desc->ext_prop_len += ext_prop->data_len;
 996        }
 997        if (desc->opts_mutex)
 998                mutex_unlock(desc->opts_mutex);
 999        return ret_len;
1000}
1001
1002CONFIGFS_ATTR(ext_prop_, type);
1003CONFIGFS_ATTR(ext_prop_, data);
1004
1005static struct configfs_attribute *ext_prop_attrs[] = {
1006        &ext_prop_attr_type,
1007        &ext_prop_attr_data,
1008        NULL,
1009};
1010
1011static void usb_os_desc_ext_prop_release(struct config_item *item)
1012{
1013        struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1014
1015        kfree(ext_prop); /* frees a whole chunk */
1016}
1017
1018static struct configfs_item_operations ext_prop_ops = {
1019        .release                = usb_os_desc_ext_prop_release,
1020};
1021
1022static struct config_item *ext_prop_make(
1023                struct config_group *group,
1024                const char *name)
1025{
1026        struct usb_os_desc_ext_prop *ext_prop;
1027        struct config_item_type *ext_prop_type;
1028        struct usb_os_desc *desc;
1029        char *vlabuf;
1030
1031        vla_group(data_chunk);
1032        vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1033        vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1034
1035        vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1036        if (!vlabuf)
1037                return ERR_PTR(-ENOMEM);
1038
1039        ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1040        ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1041
1042        desc = container_of(group, struct usb_os_desc, group);
1043        ext_prop_type->ct_item_ops = &ext_prop_ops;
1044        ext_prop_type->ct_attrs = ext_prop_attrs;
1045        ext_prop_type->ct_owner = desc->owner;
1046
1047        config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1048
1049        ext_prop->name = kstrdup(name, GFP_KERNEL);
1050        if (!ext_prop->name) {
1051                kfree(vlabuf);
1052                return ERR_PTR(-ENOMEM);
1053        }
1054        desc->ext_prop_len += 14;
1055        ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1056        if (desc->opts_mutex)
1057                mutex_lock(desc->opts_mutex);
1058        desc->ext_prop_len += ext_prop->name_len;
1059        list_add_tail(&ext_prop->entry, &desc->ext_prop);
1060        ++desc->ext_prop_count;
1061        if (desc->opts_mutex)
1062                mutex_unlock(desc->opts_mutex);
1063
1064        return &ext_prop->item;
1065}
1066
1067static void ext_prop_drop(struct config_group *group, struct config_item *item)
1068{
1069        struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1070        struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1071
1072        if (desc->opts_mutex)
1073                mutex_lock(desc->opts_mutex);
1074        list_del(&ext_prop->entry);
1075        --desc->ext_prop_count;
1076        kfree(ext_prop->name);
1077        desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1078        if (desc->opts_mutex)
1079                mutex_unlock(desc->opts_mutex);
1080        config_item_put(item);
1081}
1082
1083static struct configfs_group_operations interf_grp_ops = {
1084        .make_item      = &ext_prop_make,
1085        .drop_item      = &ext_prop_drop,
1086};
1087
1088static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1089                                             char *page)
1090{
1091        memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1092        return 8;
1093}
1094
1095static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1096                                              const char *page, size_t len)
1097{
1098        struct usb_os_desc *desc = to_usb_os_desc(item);
1099        int l;
1100
1101        l = min_t(int, 8, len);
1102        if (page[l - 1] == '\n')
1103                --l;
1104        if (desc->opts_mutex)
1105                mutex_lock(desc->opts_mutex);
1106        memcpy(desc->ext_compat_id, page, l);
1107
1108        if (desc->opts_mutex)
1109                mutex_unlock(desc->opts_mutex);
1110
1111        return len;
1112}
1113
1114static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1115                                                 char *page)
1116{
1117        memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1118        return 8;
1119}
1120
1121static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1122                                                  const char *page, size_t len)
1123{
1124        struct usb_os_desc *desc = to_usb_os_desc(item);
1125        int l;
1126
1127        l = min_t(int, 8, len);
1128        if (page[l - 1] == '\n')
1129                --l;
1130        if (desc->opts_mutex)
1131                mutex_lock(desc->opts_mutex);
1132        memcpy(desc->ext_compat_id + 8, page, l);
1133
1134        if (desc->opts_mutex)
1135                mutex_unlock(desc->opts_mutex);
1136
1137        return len;
1138}
1139
1140CONFIGFS_ATTR(interf_grp_, compatible_id);
1141CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1142
1143static struct configfs_attribute *interf_grp_attrs[] = {
1144        &interf_grp_attr_compatible_id,
1145        &interf_grp_attr_sub_compatible_id,
1146        NULL
1147};
1148
1149struct config_group *usb_os_desc_prepare_interf_dir(
1150                struct config_group *parent,
1151                int n_interf,
1152                struct usb_os_desc **desc,
1153                char **names,
1154                struct module *owner)
1155{
1156        struct config_group *os_desc_group;
1157        struct config_item_type *os_desc_type, *interface_type;
1158
1159        vla_group(data_chunk);
1160        vla_item(data_chunk, struct config_group, os_desc_group, 1);
1161        vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1162        vla_item(data_chunk, struct config_item_type, interface_type, 1);
1163
1164        char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1165        if (!vlabuf)
1166                return ERR_PTR(-ENOMEM);
1167
1168        os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1169        os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1170        interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1171
1172        os_desc_type->ct_owner = owner;
1173        config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1174        configfs_add_default_group(os_desc_group, parent);
1175
1176        interface_type->ct_group_ops = &interf_grp_ops;
1177        interface_type->ct_attrs = interf_grp_attrs;
1178        interface_type->ct_owner = owner;
1179
1180        while (n_interf--) {
1181                struct usb_os_desc *d;
1182
1183                d = desc[n_interf];
1184                d->owner = owner;
1185                config_group_init_type_name(&d->group, "", interface_type);
1186                config_item_set_name(&d->group.cg_item, "interface.%s",
1187                                     names[n_interf]);
1188                configfs_add_default_group(&d->group, os_desc_group);
1189        }
1190
1191        return os_desc_group;
1192}
1193EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1194
1195static int configfs_do_nothing(struct usb_composite_dev *cdev)
1196{
1197        WARN_ON(1);
1198        return -EINVAL;
1199}
1200
1201int composite_dev_prepare(struct usb_composite_driver *composite,
1202                struct usb_composite_dev *dev);
1203
1204int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1205                                  struct usb_ep *ep0);
1206
1207static void purge_configs_funcs(struct gadget_info *gi)
1208{
1209        struct usb_configuration        *c;
1210
1211        list_for_each_entry(c, &gi->cdev.configs, list) {
1212                struct usb_function *f, *tmp;
1213                struct config_usb_cfg *cfg;
1214
1215                cfg = container_of(c, struct config_usb_cfg, c);
1216
1217                list_for_each_entry_safe(f, tmp, &c->functions, list) {
1218
1219                        list_move_tail(&f->list, &cfg->func_list);
1220                        if (f->unbind) {
1221                                dev_dbg(&gi->cdev.gadget->dev,
1222                                        "unbind function '%s'/%p\n",
1223                                        f->name, f);
1224                                f->unbind(c, f);
1225                        }
1226                }
1227                c->next_interface_id = 0;
1228                memset(c->interface, 0, sizeof(c->interface));
1229                c->superspeed_plus = 0;
1230                c->superspeed = 0;
1231                c->highspeed = 0;
1232                c->fullspeed = 0;
1233        }
1234}
1235
1236static int configfs_composite_bind(struct usb_gadget *gadget,
1237                struct usb_gadget_driver *gdriver)
1238{
1239        struct usb_composite_driver     *composite = to_cdriver(gdriver);
1240        struct gadget_info              *gi = container_of(composite,
1241                                                struct gadget_info, composite);
1242        struct usb_composite_dev        *cdev = &gi->cdev;
1243        struct usb_configuration        *c;
1244        struct usb_string               *s;
1245        unsigned                        i;
1246        int                             ret;
1247
1248        /* the gi->lock is hold by the caller */
1249        gi->unbind = 0;
1250        cdev->gadget = gadget;
1251        set_gadget_data(gadget, cdev);
1252        ret = composite_dev_prepare(composite, cdev);
1253        if (ret)
1254                return ret;
1255        /* and now the gadget bind */
1256        ret = -EINVAL;
1257
1258        if (list_empty(&gi->cdev.configs)) {
1259                pr_err("Need at least one configuration in %s.\n",
1260                                gi->composite.name);
1261                goto err_comp_cleanup;
1262        }
1263
1264
1265        list_for_each_entry(c, &gi->cdev.configs, list) {
1266                struct config_usb_cfg *cfg;
1267
1268                cfg = container_of(c, struct config_usb_cfg, c);
1269                if (list_empty(&cfg->func_list)) {
1270                        pr_err("Config %s/%d of %s needs at least one function.\n",
1271                              c->label, c->bConfigurationValue,
1272                              gi->composite.name);
1273                        goto err_comp_cleanup;
1274                }
1275        }
1276
1277        /* init all strings */
1278        if (!list_empty(&gi->string_list)) {
1279                struct gadget_strings *gs;
1280
1281                i = 0;
1282                list_for_each_entry(gs, &gi->string_list, list) {
1283
1284                        gi->gstrings[i] = &gs->stringtab_dev;
1285                        gs->stringtab_dev.strings = gs->strings;
1286                        gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1287                                gs->manufacturer;
1288                        gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1289                        gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1290                        i++;
1291                }
1292                gi->gstrings[i] = NULL;
1293                s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1294                                USB_GADGET_FIRST_AVAIL_IDX);
1295                if (IS_ERR(s)) {
1296                        ret = PTR_ERR(s);
1297                        goto err_comp_cleanup;
1298                }
1299
1300                gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1301                gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1302                gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1303        }
1304
1305        if (gi->use_os_desc) {
1306                cdev->use_os_string = true;
1307                cdev->b_vendor_code = gi->b_vendor_code;
1308                memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1309        }
1310
1311        if (gadget_is_otg(gadget) && !otg_desc[0]) {
1312                struct usb_descriptor_header *usb_desc;
1313
1314                usb_desc = usb_otg_descriptor_alloc(gadget);
1315                if (!usb_desc) {
1316                        ret = -ENOMEM;
1317                        goto err_comp_cleanup;
1318                }
1319                usb_otg_descriptor_init(gadget, usb_desc);
1320                otg_desc[0] = usb_desc;
1321                otg_desc[1] = NULL;
1322        }
1323
1324        /* Go through all configs, attach all functions */
1325        list_for_each_entry(c, &gi->cdev.configs, list) {
1326                struct config_usb_cfg *cfg;
1327                struct usb_function *f;
1328                struct usb_function *tmp;
1329                struct gadget_config_name *cn;
1330
1331                if (gadget_is_otg(gadget))
1332                        c->descriptors = otg_desc;
1333
1334                cfg = container_of(c, struct config_usb_cfg, c);
1335                if (!list_empty(&cfg->string_list)) {
1336                        i = 0;
1337                        list_for_each_entry(cn, &cfg->string_list, list) {
1338                                cfg->gstrings[i] = &cn->stringtab_dev;
1339                                cn->stringtab_dev.strings = &cn->strings;
1340                                cn->strings.s = cn->configuration;
1341                                i++;
1342                        }
1343                        cfg->gstrings[i] = NULL;
1344                        s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1345                        if (IS_ERR(s)) {
1346                                ret = PTR_ERR(s);
1347                                goto err_comp_cleanup;
1348                        }
1349                        c->iConfiguration = s[0].id;
1350                }
1351
1352                list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1353                        list_del(&f->list);
1354                        ret = usb_add_function(c, f);
1355                        if (ret) {
1356                                list_add(&f->list, &cfg->func_list);
1357                                goto err_purge_funcs;
1358                        }
1359                }
1360                usb_ep_autoconfig_reset(cdev->gadget);
1361        }
1362        if (cdev->use_os_string) {
1363                ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1364                if (ret)
1365                        goto err_purge_funcs;
1366        }
1367
1368        usb_ep_autoconfig_reset(cdev->gadget);
1369        return 0;
1370
1371err_purge_funcs:
1372        purge_configs_funcs(gi);
1373err_comp_cleanup:
1374        composite_dev_cleanup(cdev);
1375        return ret;
1376}
1377
1378static void configfs_composite_unbind(struct usb_gadget *gadget)
1379{
1380        struct usb_composite_dev        *cdev;
1381        struct gadget_info              *gi;
1382        unsigned long flags;
1383
1384        /* the gi->lock is hold by the caller */
1385
1386        cdev = get_gadget_data(gadget);
1387        gi = container_of(cdev, struct gadget_info, cdev);
1388        spin_lock_irqsave(&gi->spinlock, flags);
1389        gi->unbind = 1;
1390        spin_unlock_irqrestore(&gi->spinlock, flags);
1391
1392        kfree(otg_desc[0]);
1393        otg_desc[0] = NULL;
1394        purge_configs_funcs(gi);
1395        composite_dev_cleanup(cdev);
1396        usb_ep_autoconfig_reset(cdev->gadget);
1397        spin_lock_irqsave(&gi->spinlock, flags);
1398        cdev->gadget = NULL;
1399        set_gadget_data(gadget, NULL);
1400        spin_unlock_irqrestore(&gi->spinlock, flags);
1401}
1402
1403static int configfs_composite_setup(struct usb_gadget *gadget,
1404                const struct usb_ctrlrequest *ctrl)
1405{
1406        struct usb_composite_dev *cdev;
1407        struct gadget_info *gi;
1408        unsigned long flags;
1409        int ret;
1410
1411        cdev = get_gadget_data(gadget);
1412        if (!cdev)
1413                return 0;
1414
1415        gi = container_of(cdev, struct gadget_info, cdev);
1416        spin_lock_irqsave(&gi->spinlock, flags);
1417        cdev = get_gadget_data(gadget);
1418        if (!cdev || gi->unbind) {
1419                spin_unlock_irqrestore(&gi->spinlock, flags);
1420                return 0;
1421        }
1422
1423        ret = composite_setup(gadget, ctrl);
1424        spin_unlock_irqrestore(&gi->spinlock, flags);
1425        return ret;
1426}
1427
1428static void configfs_composite_disconnect(struct usb_gadget *gadget)
1429{
1430        struct usb_composite_dev *cdev;
1431        struct gadget_info *gi;
1432        unsigned long flags;
1433
1434        cdev = get_gadget_data(gadget);
1435        if (!cdev)
1436                return;
1437
1438        gi = container_of(cdev, struct gadget_info, cdev);
1439        spin_lock_irqsave(&gi->spinlock, flags);
1440        cdev = get_gadget_data(gadget);
1441        if (!cdev || gi->unbind) {
1442                spin_unlock_irqrestore(&gi->spinlock, flags);
1443                return;
1444        }
1445
1446        composite_disconnect(gadget);
1447        spin_unlock_irqrestore(&gi->spinlock, flags);
1448}
1449
1450static void configfs_composite_suspend(struct usb_gadget *gadget)
1451{
1452        struct usb_composite_dev *cdev;
1453        struct gadget_info *gi;
1454        unsigned long flags;
1455
1456        cdev = get_gadget_data(gadget);
1457        if (!cdev)
1458                return;
1459
1460        gi = container_of(cdev, struct gadget_info, cdev);
1461        spin_lock_irqsave(&gi->spinlock, flags);
1462        cdev = get_gadget_data(gadget);
1463        if (!cdev || gi->unbind) {
1464                spin_unlock_irqrestore(&gi->spinlock, flags);
1465                return;
1466        }
1467
1468        composite_suspend(gadget);
1469        spin_unlock_irqrestore(&gi->spinlock, flags);
1470}
1471
1472static void configfs_composite_resume(struct usb_gadget *gadget)
1473{
1474        struct usb_composite_dev *cdev;
1475        struct gadget_info *gi;
1476        unsigned long flags;
1477
1478        cdev = get_gadget_data(gadget);
1479        if (!cdev)
1480                return;
1481
1482        gi = container_of(cdev, struct gadget_info, cdev);
1483        spin_lock_irqsave(&gi->spinlock, flags);
1484        cdev = get_gadget_data(gadget);
1485        if (!cdev || gi->unbind) {
1486                spin_unlock_irqrestore(&gi->spinlock, flags);
1487                return;
1488        }
1489
1490        composite_resume(gadget);
1491        spin_unlock_irqrestore(&gi->spinlock, flags);
1492}
1493
1494static const struct usb_gadget_driver configfs_driver_template = {
1495        .bind           = configfs_composite_bind,
1496        .unbind         = configfs_composite_unbind,
1497
1498        .setup          = configfs_composite_setup,
1499        .reset          = configfs_composite_disconnect,
1500        .disconnect     = configfs_composite_disconnect,
1501
1502        .suspend        = configfs_composite_suspend,
1503        .resume         = configfs_composite_resume,
1504
1505        .max_speed      = USB_SPEED_SUPER,
1506        .driver = {
1507                .owner          = THIS_MODULE,
1508                .name           = "configfs-gadget",
1509        },
1510        .match_existing_only = 1,
1511};
1512
1513static struct config_group *gadgets_make(
1514                struct config_group *group,
1515                const char *name)
1516{
1517        struct gadget_info *gi;
1518
1519        gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1520        if (!gi)
1521                return ERR_PTR(-ENOMEM);
1522
1523        config_group_init_type_name(&gi->group, name, &gadget_root_type);
1524
1525        config_group_init_type_name(&gi->functions_group, "functions",
1526                        &functions_type);
1527        configfs_add_default_group(&gi->functions_group, &gi->group);
1528
1529        config_group_init_type_name(&gi->configs_group, "configs",
1530                        &config_desc_type);
1531        configfs_add_default_group(&gi->configs_group, &gi->group);
1532
1533        config_group_init_type_name(&gi->strings_group, "strings",
1534                        &gadget_strings_strings_type);
1535        configfs_add_default_group(&gi->strings_group, &gi->group);
1536
1537        config_group_init_type_name(&gi->os_desc_group, "os_desc",
1538                        &os_desc_type);
1539        configfs_add_default_group(&gi->os_desc_group, &gi->group);
1540
1541        gi->composite.bind = configfs_do_nothing;
1542        gi->composite.unbind = configfs_do_nothing;
1543        gi->composite.suspend = NULL;
1544        gi->composite.resume = NULL;
1545        gi->composite.max_speed = USB_SPEED_SUPER;
1546
1547        mutex_init(&gi->lock);
1548        INIT_LIST_HEAD(&gi->string_list);
1549        INIT_LIST_HEAD(&gi->available_func);
1550
1551        composite_init_dev(&gi->cdev);
1552        gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1553        gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1554        gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1555
1556        gi->composite.gadget_driver = configfs_driver_template;
1557
1558        gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1559        gi->composite.name = gi->composite.gadget_driver.function;
1560
1561        if (!gi->composite.gadget_driver.function)
1562                goto err;
1563
1564        return &gi->group;
1565err:
1566        kfree(gi);
1567        return ERR_PTR(-ENOMEM);
1568}
1569
1570static void gadgets_drop(struct config_group *group, struct config_item *item)
1571{
1572        config_item_put(item);
1573}
1574
1575static struct configfs_group_operations gadgets_ops = {
1576        .make_group     = &gadgets_make,
1577        .drop_item      = &gadgets_drop,
1578};
1579
1580static const struct config_item_type gadgets_type = {
1581        .ct_group_ops   = &gadgets_ops,
1582        .ct_owner       = THIS_MODULE,
1583};
1584
1585static struct configfs_subsystem gadget_subsys = {
1586        .su_group = {
1587                .cg_item = {
1588                        .ci_namebuf = "usb_gadget",
1589                        .ci_type = &gadgets_type,
1590                },
1591        },
1592        .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1593};
1594
1595void unregister_gadget_item(struct config_item *item)
1596{
1597        struct gadget_info *gi = to_gadget_info(item);
1598
1599        mutex_lock(&gi->lock);
1600        unregister_gadget(gi);
1601        mutex_unlock(&gi->lock);
1602}
1603EXPORT_SYMBOL_GPL(unregister_gadget_item);
1604
1605static int __init gadget_cfs_init(void)
1606{
1607        int ret;
1608
1609        config_group_init(&gadget_subsys.su_group);
1610
1611        ret = configfs_register_subsystem(&gadget_subsys);
1612        return ret;
1613}
1614module_init(gadget_cfs_init);
1615
1616static void __exit gadget_cfs_exit(void)
1617{
1618        configfs_unregister_subsystem(&gadget_subsys);
1619}
1620module_exit(gadget_cfs_exit);
1621