usb_moded-configfs.c 25 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/**
 * @file usb_moded-configfs.c
 *
 * Copyright (C) 2018 Jolla. All rights reserved.
 *
 * @author: Simo Piiroinen <simo.piiroinen@jollamobile.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the Lesser GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the Lesser GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include "usb_moded-configfs.h"

#include "usb_moded.h"
#include "usb_moded-android.h"
27
#include "usb_moded-common.h"
28
#include "usb_moded-config-private.h"
29
#include "usb_moded-log.h"
30
#include "usb_moded-mac.h"
31 32 33 34 35 36 37 38

#include <sys/stat.h>

#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
39 40 41 42 43

/* ========================================================================= *
 * Constants
 * ========================================================================= */

44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61
/* Due to legacy these defaults must match what is required by Sony XA2 port */
#define DEFAULT_GADGET_BASE_DIRECTORY    "/config/usb_gadget/g1"
#define DEFAULT_GADGET_FUNC_DIRECTORY    "functions"
#define DEFAULT_GADGET_CONF_DIRECTORY    "configs/b.1"

#define DEFAULT_GADGET_CTRL_UDC          "UDC"
#define DEFAULT_GADGET_CTRL_ID_VENDOR    "idVendor"
#define DEFAULT_GADGET_CTRL_ID_PRODUCT   "idProduct"
#define DEFAULT_GADGET_CTRL_MANUFACTURER "strings/0x409/manufacturer"
#define DEFAULT_GADGET_CTRL_PRODUCT      "strings/0x409/product"
#define DEFAULT_GADGET_CTRL_SERIAL       "strings/0x409/serialnumber"

#define DEFAULT_FUNCTION_MASS_STORAGE    "mass_storage.usb0"
#define DEFAULT_FUNCTION_RNDIS           "rndis_bam.rndis"
#define DEFAULT_FUNCTION_MTP             "ffs.mtp"

#define DEFAULT_RNDIS_CTRL_WCEIS         "wceis"
#define DEFAULT_RNDIS_CTRL_ETHADDR       "ethaddr"
62 63 64 65 66 67 68

/* ========================================================================= *
 * Prototypes
 * ========================================================================= */

/* -- configfs -- */

69 70
static gchar      *configfs_get_conf               (const char *key, const char *def);
static void        configfs_read_configuration     (void);
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
static int         configfs_file_type              (const char *path);
static const char *configfs_function_path          (char *buff, size_t size, const char *func, ...);
static const char *configfs_unit_path              (char *buff, size_t size, const char *func, const char *unit);
static const char *configfs_config_path            (char *buff, size_t size, const char *func);
static bool        configfs_mkdir                  (const char *path);
static bool        configfs_rmdir                  (const char *path);
static const char *configfs_register_function      (const char *function);
static const char *configfs_add_unit               (const char *function, const char *unit);
static bool        configfs_remove_unit            (const char *function, const char *unit);
static bool        configfs_enable_function        (const char *function);
static bool        configfs_disable_function       (const char *function);
static bool        configfs_disable_all_functions  (void);
static char       *configfs_strip                  (char *str);
bool               configfs_in_use                 (void);
static bool        configfs_probe                  (void);
static const char *configfs_udc_enable_value       (void);
static bool        configfs_write_file             (const char *path, const char *text);
static bool        configfs_read_file              (const char *path, char *buff, size_t size);
static bool        configfs_write_udc              (const char *text);
bool               configfs_set_udc                (bool enable);
91 92
bool               configfs_init                   (void);
void               configfs_quit                   (void);
93 94 95 96 97 98 99 100
bool               configfs_set_charging_mode      (void);
bool               configfs_set_productid          (const char *id);
bool               configfs_set_vendorid           (const char *id);
static const char *configfs_map_function           (const char *func);
bool               configfs_set_function           (const char *func);
bool               configfs_add_mass_storage_lun   (int lun);
bool               configfs_remove_mass_storage_lun(int lun);
bool               configfs_set_mass_storage_attr  (int lun, const char *attr, const char *value);
101 102 103 104 105 106 107

/* ========================================================================= *
 * Data
 * ========================================================================= */

static int configfs_probed = -1;

108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247
static gchar *GADGET_BASE_DIRECTORY    = 0;
static gchar *GADGET_FUNC_DIRECTORY    = 0;
static gchar *GADGET_CONF_DIRECTORY    = 0;

static gchar *GADGET_CTRL_UDC          = 0;
static gchar *GADGET_CTRL_ID_VENDOR    = 0;
static gchar *GADGET_CTRL_ID_PRODUCT   = 0;
static gchar *GADGET_CTRL_MANUFACTURER = 0;
static gchar *GADGET_CTRL_PRODUCT      = 0;
static gchar *GADGET_CTRL_SERIAL       = 0;

static gchar *FUNCTION_MASS_STORAGE    = 0;
static gchar *FUNCTION_RNDIS           = 0;
static gchar *FUNCTION_MTP             = 0;

static gchar *RNDIS_CTRL_WCEIS         = 0;
static gchar *RNDIS_CTRL_ETHADDR       = 0;

/* ========================================================================= *
 * Settings
 * ========================================================================= */

static gchar *configfs_get_conf(const char *key, const char *def)
{
    LOG_REGISTER_CONTEXT;

    return config_get_conf_string("configfs", key) ?: g_strdup(def);
}

/** Parse configfs configuration entries
 *
 * The defaults correspond with ini-file like (h3113 values):
 *
 * [configfs]
 * gadget_base_directory = /config/usb_gadget/g1
 * gadget_func_directory = functions
 * gadget_conf_directory = configs/b.1
 * function_mass_storage = mass_storage.usb0
 * function_rndis        = rndis_bam.rndis
 * function_mtp          = ffs.mtp
 */
static void configfs_read_configuration(void)
{
    LOG_REGISTER_CONTEXT;

    /* This must be done only once
     */
    static bool done = false;

    if( done )
        goto EXIT;

    done = true;

    gchar *temp_setting;

    /* Gadget directories
     */
    GADGET_BASE_DIRECTORY =
        configfs_get_conf("gadget_base_directory",
                          DEFAULT_GADGET_BASE_DIRECTORY);

    temp_setting = configfs_get_conf("gadget_func_directory",
                             DEFAULT_GADGET_FUNC_DIRECTORY);
    GADGET_FUNC_DIRECTORY = g_strdup_printf("%s/%s",
                                            GADGET_BASE_DIRECTORY,
                                            temp_setting);
    g_free(temp_setting);

    temp_setting = configfs_get_conf("gadget_conf_directory",
                             DEFAULT_GADGET_CONF_DIRECTORY);
    GADGET_CONF_DIRECTORY =
        g_strdup_printf("%s/%s",
                        GADGET_BASE_DIRECTORY,
                        temp_setting);
    g_free(temp_setting);

    /* Gadget control files
     */
    GADGET_CTRL_UDC =
        g_strdup_printf("%s/%s",
                        GADGET_BASE_DIRECTORY,
                        DEFAULT_GADGET_CTRL_UDC);

    GADGET_CTRL_ID_VENDOR =
        g_strdup_printf("%s/%s",
                        GADGET_BASE_DIRECTORY,
                        DEFAULT_GADGET_CTRL_ID_VENDOR);

    GADGET_CTRL_ID_PRODUCT =
        g_strdup_printf("%s/%s",
                        GADGET_BASE_DIRECTORY,
                        DEFAULT_GADGET_CTRL_ID_PRODUCT);

    GADGET_CTRL_MANUFACTURER =
        g_strdup_printf("%s/%s",
                        GADGET_BASE_DIRECTORY,
                        DEFAULT_GADGET_CTRL_MANUFACTURER);

    GADGET_CTRL_PRODUCT =
        g_strdup_printf("%s/%s",
                        GADGET_BASE_DIRECTORY,
                        DEFAULT_GADGET_CTRL_PRODUCT);

    GADGET_CTRL_SERIAL =
        g_strdup_printf("%s/%s",
                        GADGET_BASE_DIRECTORY,
                        DEFAULT_GADGET_CTRL_SERIAL);

    /* Functions
     */
    FUNCTION_MASS_STORAGE =
        configfs_get_conf("function_mass_storage",
                          DEFAULT_FUNCTION_MASS_STORAGE);

    FUNCTION_RNDIS =
        configfs_get_conf("function_rndis",
                          DEFAULT_FUNCTION_RNDIS);

    FUNCTION_MTP =
        configfs_get_conf("function_mtp",
                          DEFAULT_FUNCTION_MTP);

    /* Function control files */
    RNDIS_CTRL_WCEIS =
        g_strdup_printf("%s/%s/%s",
                        GADGET_FUNC_DIRECTORY,
                        FUNCTION_RNDIS,
                        DEFAULT_RNDIS_CTRL_WCEIS);

    RNDIS_CTRL_ETHADDR =
        g_strdup_printf("%s/%s/%s",
                        GADGET_FUNC_DIRECTORY,
                        FUNCTION_RNDIS,
                        DEFAULT_RNDIS_CTRL_ETHADDR);

EXIT:
    return;
}

248 249 250 251 252 253
/* ========================================================================= *
 * Functions
 * ========================================================================= */

static int configfs_file_type(const char *path)
{
254 255
    LOG_REGISTER_CONTEXT;

256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
    int type = -1;

    if( !path )
        goto EXIT;

    struct stat st;
    if( lstat(path, &st) == -1 )
        goto EXIT;

    type = st.st_mode & S_IFMT;

EXIT:
    return type;
}

static const char *
272
configfs_function_path(char *buff, size_t size, const char *func, ...)
273
{
274 275
    LOG_REGISTER_CONTEXT;

276 277 278
    char *pos = buff;
    char *end = buff + size;

279
    snprintf(pos, end-pos, "%s", GADGET_FUNC_DIRECTORY);
280 281 282 283 284 285 286 287 288 289

    va_list va;
    va_start(va, func);
    while( func ) {
        pos = strchr(pos, 0);
        snprintf(pos, end-pos, "/%s", func);
        func = va_arg(va, char *);
    }
    va_end(va);

290 291 292
    return buff;
}

293 294 295
static const char *
configfs_unit_path(char *buff, size_t size, const char *func, const char *unit)
{
296 297
    LOG_REGISTER_CONTEXT;

298 299 300
    return configfs_function_path(buff, size, func, unit, NULL);
}

301 302 303
static const char *
configfs_config_path(char *buff, size_t size, const char *func)
{
304 305
    LOG_REGISTER_CONTEXT;

306
    snprintf(buff, size, "%s/%s", GADGET_CONF_DIRECTORY, func);
307 308 309
    return buff;
}

310 311
static bool
configfs_mkdir(const char *path)
312
{
313 314
    LOG_REGISTER_CONTEXT;

315
    bool ack = false;
316

317 318 319 320
    if( mkdir(path, 0775) == -1 && errno != EEXIST ) {
        log_err("%s: mkdir failed: %m", path);
        goto EXIT;
    }
321

322 323
    if( configfs_file_type(path) != S_IFDIR ) {
        log_err("%s: is not a directory", path);
324 325 326
        goto EXIT;
    }

327 328 329 330 331 332 333 334 335
    ack = true;

EXIT:
    return ack;
}

static bool
configfs_rmdir(const char *path)
{
336 337
    LOG_REGISTER_CONTEXT;

338 339 340 341
    bool ack = false;

    if( rmdir(path) == -1 && errno != ENOENT ) {
        log_err("%s: rmdir failed: %m", path);
342 343 344
        goto EXIT;
    }

345 346 347 348 349 350 351 352 353
    ack = true;

EXIT:
    return ack;
}

static const char *
configfs_register_function(const char *function)
{
354 355
    LOG_REGISTER_CONTEXT;

356 357 358 359 360 361 362 363
    const char *res = 0;

    static char fpath[256];
    configfs_function_path(fpath, sizeof fpath, function, NULL);

    if( !configfs_mkdir(fpath) )
        goto EXIT;

364 365 366 367 368 369 370 371 372 373 374 375
    log_debug("function %s is registered", function);

    res = fpath;

EXIT:
    return res;
}

#ifdef DEAD_CODE
static bool
configfs_unregister_function(const char *function)
{
376 377
    LOG_REGISTER_CONTEXT;

378 379 380
    bool ack = false;

    char fpath[256];
381
    configfs_function_path(fpath, sizeof fpath, function, NULL);
382

383
    if( !configfs_rmdir(fpath) )
384 385 386 387 388 389 390 391 392 393
        goto EXIT;

    log_debug("function %s is unregistered", function);
    ack = true;

EXIT:
    return ack;
}
#endif

394 395 396
static const char *
configfs_add_unit(const char *function, const char *unit)
{
397 398
    LOG_REGISTER_CONTEXT;

399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417
    const char *res = 0;

    static char upath[256];
    configfs_unit_path(upath, sizeof upath, function, unit);

    if( !configfs_mkdir(upath) )
        goto EXIT;

    log_debug("function %s unit %s added", function, unit);

    res = upath;

EXIT:
    return res;
}

static bool
configfs_remove_unit(const char *function, const char *unit)
{
418 419
    LOG_REGISTER_CONTEXT;

420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435
    bool ack = false;

    static char upath[256];
    configfs_unit_path(upath, sizeof upath, function, unit);

    if( !configfs_rmdir(upath) )
        goto EXIT;

    log_debug("function %s unit %s removed", function, unit);

    ack = true;

EXIT:
    return ack;
}

436 437 438
static bool
configfs_enable_function(const char *function)
{
439 440
    LOG_REGISTER_CONTEXT;

441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479
    bool ack = false;

    const char *fpath = configfs_register_function(function);
    if( !fpath ) {
        log_err("function %s is not registered", function);
        goto EXIT;
    }

    char cpath[256];
    configfs_config_path(cpath, sizeof cpath, function);

    switch( configfs_file_type(cpath) ) {
    case S_IFLNK:
        if( unlink(cpath) == -1 ) {
            log_err("%s: unlink failed: %m", cpath);
            goto EXIT;
        }
        /* fall through */
    case -1:
        if( symlink(fpath, cpath) == -1 ) {
            log_err("%s: failed to symlink to %s: %m", cpath, fpath);
            goto EXIT;
        }
        break;
    default:
        log_err("%s: is not a symlink", cpath);
        goto EXIT;
    }

    log_debug("function %s is enabled", function);
    ack = true;

EXIT:
    return ack;
}

static bool
configfs_disable_function(const char *function)
{
480 481
    LOG_REGISTER_CONTEXT;

482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506
    bool ack = false;

    char cpath[256];
    configfs_config_path(cpath, sizeof cpath, function);

    if( configfs_file_type(cpath) != S_IFLNK ) {
        log_err("%s: is not a symlink", cpath);
        goto EXIT;
    }

    if( unlink(cpath) == -1 ) {
        log_err("%s: unlink failed: %m", cpath);
        goto EXIT;
    }

    log_debug("function %s is disabled", function);
    ack = true;

EXIT:
    return ack;
}

static bool
configfs_disable_all_functions(void)
{
507 508
    LOG_REGISTER_CONTEXT;

509 510 511
    bool  ack = false;
    DIR  *dir = 0;

512 513
    if( !(dir = opendir(GADGET_CONF_DIRECTORY)) ) {
        log_err("%s: opendir failed: %m", GADGET_CONF_DIRECTORY);
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539
        goto EXIT;
    }

    ack = true;

    struct dirent *de;
    while( (de = readdir(dir)) ) {
        if( de->d_type != DT_LNK )
            continue;

        if( !configfs_disable_function(de->d_name) )
            ack = false;
    }

    if( ack )
        log_debug("all functions are disabled");

EXIT:
    if( dir )
        closedir(dir);

    return ack;
}

static char *configfs_strip(char *str)
{
540 541
    LOG_REGISTER_CONTEXT;

542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560
    unsigned char *src = (unsigned char *)str;
    unsigned char *dst = (unsigned char *)str;

    while( *src > 0 && *src <= 32 ) ++src;

    for( ;; )
    {
        while( *src > 32 ) *dst++ = *src++;
        while( *src > 0 && *src <= 32 ) ++src;
        if( *src == 0 ) break;
        *dst++ = ' ';
    }
    *dst = 0;
    return str;
}

bool
configfs_in_use(void)
{
561 562
    LOG_REGISTER_CONTEXT;

563 564 565 566 567 568 569 570
    if( configfs_probed < 0 )
        log_debug("configfs_in_use() called before configfs_probe()");
    return configfs_probed > 0;
}

static bool
configfs_probe(void)
{
571 572
    LOG_REGISTER_CONTEXT;

573 574
    configfs_read_configuration();

575
    if( configfs_probed <= 0 ) {
576 577
        configfs_probed = (access(GADGET_BASE_DIRECTORY, F_OK) == 0 &&
                           access(GADGET_CTRL_UDC, F_OK) == 0);
578 579 580 581 582 583 584 585
        log_warning("CONFIGFS %sdetected", configfs_probed ? "" : "not ");
    }
    return configfs_in_use();
}

static const char *
configfs_udc_enable_value(void)
{
586 587
    LOG_REGISTER_CONTEXT;

588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615
    static bool  probed = false;
    static char *value  = 0;

    if( !probed ) {
        probed = true;

        /* Find first symlink in /sys/class/udc directory */
        struct dirent *de;
        DIR *dir = opendir("/sys/class/udc");
        if( dir ) {
            while( (de = readdir(dir)) ) {
                if( de->d_type != DT_LNK )
                    continue;
                if( de->d_name[0] == '.' )
                    continue;
                value = strdup(de->d_name);
                break;
            }
            closedir(dir);
        }
    }

    return value ?: "";
}

static bool
configfs_write_file(const char *path, const char *text)
{
616 617
    LOG_REGISTER_CONTEXT;

618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657
    bool ack = false;
    int  fd  = -1;

    if( !path || !text )
        goto EXIT;

    log_debug("WRITE %s '%s'", path, text);

    char buff[64];
    snprintf(buff, sizeof buff, "%s\n", text);
    size_t size = strlen(buff);

    if( (fd = open(path, O_WRONLY)) == -1 ) {
        log_err("%s: can't open for writing: %m", path);
        goto EXIT;
    }

    int rc = write(fd, text, size);
    if( rc == -1 ) {
        log_err("%s: write failure: %m", path);
        goto EXIT;
    }

    if( (size_t)rc != size ) {
        log_err("%s: write failure: partial success", path);
        goto EXIT;
    }

    ack = true;

EXIT:
    if( fd != -1 )
        close(fd);

    return ack;
}

static bool
configfs_read_file(const char *path, char *buff, size_t size)
{
658 659
    LOG_REGISTER_CONTEXT;

660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697
    bool ack = false;
    int  fd  = -1;

    if( !path || !buff )
        goto EXIT;

    if( size < 2 )
        goto EXIT;

    if( (fd = open(path, O_RDONLY)) == -1 ) {
        log_err("%s: can't open for reading: %m", path);
        goto EXIT;
    }

    int rc = read(fd, buff, size - 1);
    if( rc == -1 ) {
        log_err("%s: read failure: %m", path);
        goto EXIT;
    }

    buff[rc] = 0;
    configfs_strip(buff);

    ack = true;

    log_debug("READ %s '%s'", path, buff);

EXIT:
    if( fd != -1 )
        close(fd);

    return ack;
}

#ifdef DEAD_CODE
static bool
configfs_read_udc(char *buff, size_t size)
{
698 699
    LOG_REGISTER_CONTEXT;

700
    return configfs_read_file(GADGET_CTRL_UDC, buff, size);
701 702 703 704 705 706
}
#endif

static bool
configfs_write_udc(const char *text)
{
707 708
    LOG_REGISTER_CONTEXT;

709 710 711 712
    bool ack = false;

    char prev[64];

713
    if( !configfs_read_file(GADGET_CTRL_UDC, prev, sizeof prev) )
714 715 716
        goto EXIT;

    if( strcmp(prev, text) ) {
717
        if( !configfs_write_file(GADGET_CTRL_UDC, text) )
718 719 720 721 722 723 724 725 726 727 728 729 730
            goto EXIT;
    }

    ack = true;

EXIT:
    return ack;

}

bool
configfs_set_udc(bool enable)
{
731 732
    LOG_REGISTER_CONTEXT;

733 734 735 736 737 738 739 740 741 742 743
    log_debug("UDC - %s", enable ? "ENABLE" : "DISABLE");

    const char *value = "";

    if( enable )
        value = configfs_udc_enable_value();

    return configfs_write_udc(value);
}

/** initialize the basic configfs values
744 745
 *
 * @return true if configfs backend is ready for use, false otherwise
746 747
 */
bool
748
configfs_init(void)
749
{
750 751
    LOG_REGISTER_CONTEXT;

752 753 754 755 756 757 758 759 760
    if( !configfs_probe() )
        goto EXIT;

    /* Disable */
    configfs_set_udc(false);

    /* Configure */
    gchar *text;
    if( (text = config_get_android_vendor_id()) ) {
761
        configfs_write_file(GADGET_CTRL_ID_VENDOR, text);
762 763 764 765
        g_free(text);
    }

    if( (text = config_get_android_product_id()) ) {
766
        configfs_write_file(GADGET_CTRL_ID_PRODUCT, text);
767 768 769 770
        g_free(text);
    }

    if( (text = config_get_android_manufacturer()) ) {
771
        configfs_write_file(GADGET_CTRL_MANUFACTURER, text);
772 773 774 775
        g_free(text);
    }

    if( (text = config_get_android_product()) ) {
776
        configfs_write_file(GADGET_CTRL_PRODUCT, text);
777 778 779 780
        g_free(text);
    }

    if( (text = android_get_serial()) ) {
781
        configfs_write_file(GADGET_CTRL_SERIAL, text);
782 783 784 785 786 787 788 789 790
        g_free(text);
    }

    /* Prep: charging_only */
    configfs_register_function(FUNCTION_MASS_STORAGE);

    /* Prep: mtp_mode */
    configfs_register_function(FUNCTION_MTP);
    if( access("/dev/mtp/ep0", F_OK) == -1 ) {
791
        common_system("/bin/mount -o uid=100000,gid=100000 -t functionfs mtp /dev/mtp");
792 793 794 795 796
    }

    /* Prep: developer_mode */
    configfs_register_function(FUNCTION_RNDIS);
    if( (text = mac_read_mac()) ) {
797
        configfs_write_file(RNDIS_CTRL_ETHADDR, text);
798 799 800
        g_free(text);
    }
    /* For rndis to be discovered correctly in M$ Windows (vista and later) */
801
    configfs_write_file(RNDIS_CTRL_WCEIS, "1");
802 803 804 805 806 807

    /* Leave disabled, will enable on cable connect detected */
EXIT:
    return configfs_in_use();
}

808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
/** Cleanup resources allocated by configfs backend
 */
void
configfs_quit(void)
{
    g_free(GADGET_BASE_DIRECTORY),
        GADGET_BASE_DIRECTORY = 0;
    g_free(GADGET_FUNC_DIRECTORY),
        GADGET_FUNC_DIRECTORY = 0;
    g_free(GADGET_CONF_DIRECTORY),
        GADGET_CONF_DIRECTORY = 0;

    g_free(GADGET_CTRL_UDC),
        GADGET_CTRL_UDC = 0;
    g_free(GADGET_CTRL_ID_VENDOR),
        GADGET_CTRL_ID_VENDOR= 0;
    g_free(GADGET_CTRL_ID_PRODUCT),
        GADGET_CTRL_ID_PRODUCT= 0;
    g_free(GADGET_CTRL_MANUFACTURER),
        GADGET_CTRL_MANUFACTURER= 0;
    g_free(GADGET_CTRL_PRODUCT),
        GADGET_CTRL_PRODUCT = 0;
    g_free(GADGET_CTRL_SERIAL),
        GADGET_CTRL_SERIAL = 0;

    g_free(FUNCTION_MASS_STORAGE),
        FUNCTION_MASS_STORAGE = 0;
    g_free(FUNCTION_RNDIS),
        FUNCTION_RNDIS = 0;
    g_free(FUNCTION_MTP),
        FUNCTION_MTP = 0;

    g_free(RNDIS_CTRL_WCEIS),
        RNDIS_CTRL_WCEIS = 0;
    g_free(RNDIS_CTRL_ETHADDR),
        RNDIS_CTRL_ETHADDR= 0;
}

846 847 848 849 850 851 852
/* Set a charging mode for the configfs gadget
 *
 * @return true if successful, false on failure
 */
bool
configfs_set_charging_mode(void)
{
853 854
    LOG_REGISTER_CONTEXT;

855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879
    bool ack = false;

    if( !configfs_set_function("mass_storage") )
        goto EXIT;

    /* TODO: make this configurable */
    configfs_set_productid("0AFE");

    if( !configfs_set_udc(true) )
        goto EXIT;

    ack = true;

EXIT:
    log_debug("CONFIGFS %s() -> %d", __func__, ack);
    return ack;
}

/* Set a product id for the configfs gadget
 *
 * @return true if successful, false on failure
 */
bool
configfs_set_productid(const char *id)
{
880 881
    LOG_REGISTER_CONTEXT;

882 883 884 885 886 887 888 889 890 891 892 893
    bool ack = false;

    if( id && configfs_in_use() ) {
        /* Config files have things like "0A02".
         * Kernel wants to see "0x0a02" ... */
        char *end = 0;
        unsigned num = strtol(id, &end, 16);
        char     str[16];
        if( end > id && *end == 0 ) {
            snprintf(str, sizeof str, "0x%04x", num);
            id = str;
        }
894
        ack = configfs_write_file(GADGET_CTRL_ID_PRODUCT, id);
895 896 897 898 899 900 901 902 903 904 905 906 907
    }

    log_debug("CONFIGFS %s(%s) -> %d", __func__, id, ack);
    return ack;
}

/* Set a vendor id for the configfs gadget
 *
 * @return true if successful, false on failure
 */
bool
configfs_set_vendorid(const char *id)
{
908 909
    LOG_REGISTER_CONTEXT;

910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925
    bool ack = false;

    if( id && configfs_in_use() ) {
        log_debug("%s(%s) was called", __func__, id);

        /* Config files have things like "0A02".
         * Kernel wants to see "0x0a02" ... */
        char *end = 0;
        unsigned num = strtol(id, &end, 16);
        char     str[16];

        if( end > id && *end == 0 ) {
            snprintf(str, sizeof str, "0x%04x", num);
            id = str;
        }

926
        ack = configfs_write_file(GADGET_CTRL_ID_VENDOR, id);
927 928 929 930 931 932 933 934 935
    }

    log_debug("CONFIGFS %s(%s) -> %d", __func__, id, ack);
    return ack;
}

static const char *
configfs_map_function(const char *func)
{
936 937
    LOG_REGISTER_CONTEXT;

938 939 940
    if( func == 0 )
        ;
    else if( !strcmp(func, "mass_storage") )
941 942 943 944 945 946 947 948 949 950 951
        func = FUNCTION_MASS_STORAGE;
    else if( !strcmp(func, "rndis") )
        func = FUNCTION_RNDIS;
    else if( !strcmp(func, "mtp") )
        func = FUNCTION_MTP;
    else if( !strcmp(func, "ffs") ) // existing config files ...
        func = FUNCTION_MTP;
    return func;
}

/* Set a function
952 953
 *
 * @param func Mame of function to enable, or NULL to disable all
954 955 956 957 958 959
 *
 * @return true if successful, false on failure
 */
bool
configfs_set_function(const char *func)
{
960 961
    LOG_REGISTER_CONTEXT;

962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977
    bool ack = false;

    if( !configfs_in_use() )
        goto EXIT;

    /* Normalize names used by usb-moded itself and already
     * existing configuration files etc.
     */
    func = configfs_map_function(func);

    if( !configfs_set_udc(false) )
        goto EXIT;

    if( !configfs_disable_all_functions() )
        goto EXIT;

978
    if( func && !configfs_enable_function(func) )
979 980 981 982 983 984 985 986 987 988 989
        goto EXIT;

    /* Leave disabled, so that caller can adjust attributes
     * etc before enabling */

    ack = true;

EXIT:
    log_debug("CONFIGFS %s(%s) -> %d", __func__, func, ack);
    return ack;
}
990 991 992 993

bool
configfs_add_mass_storage_lun(int lun)
{
994 995
    LOG_REGISTER_CONTEXT;

996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
    bool ack = false;

    if( !configfs_in_use() )
        goto EXIT;

    char unit[32];
    snprintf(unit, sizeof unit, "lun.%d", lun);
    ack = configfs_add_unit(FUNCTION_MASS_STORAGE, unit) != 0;

EXIT:
    return ack;
}

bool
configfs_remove_mass_storage_lun(int lun)
{
1012 1013
    LOG_REGISTER_CONTEXT;

1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
    bool ack = false;

    if( !configfs_in_use() )
        goto EXIT;

    char unit[32];
    snprintf(unit, sizeof unit, "lun.%d", lun);
    ack = configfs_remove_unit(FUNCTION_MASS_STORAGE, unit);

EXIT:
    return ack;
}

bool
configfs_set_mass_storage_attr(int lun, const char *attr, const char *value)
{
1030 1031
    LOG_REGISTER_CONTEXT;

1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046
    bool ack = false;

    if( !configfs_in_use() )
        goto EXIT;

    char unit[32];
    snprintf(unit, sizeof unit, "lun.%d", lun);
    char path[256];
    configfs_function_path(path, sizeof path, FUNCTION_MASS_STORAGE,
                           unit, attr, NULL);
    ack = configfs_write_file(path, value);

EXIT:
    return ack;
}