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usb_moded-configfs.c
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/**
* @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"
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#include "usb_moded-common.h"
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#include "usb_moded-config-private.h"
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#include "usb_moded-log.h"
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#include "usb_moded-mac.h"
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#include <sys/stat.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
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/* ========================================================================= *
* Constants
* ========================================================================= */
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/* 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"
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/* ========================================================================= *
* Prototypes
* ========================================================================= */
/* -- configfs -- */
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static gchar *configfs_get_conf (const char *key, const char *def);
static void configfs_read_configuration (void);
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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);
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bool configfs_init (void);
void configfs_quit (void);
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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);
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/* ========================================================================= *
* Data
* ========================================================================= */
static int configfs_probed = -1;
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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;
}
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/* ========================================================================= *
* Functions
* ========================================================================= */
static int configfs_file_type(const char *path)
{
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LOG_REGISTER_CONTEXT;
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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 *
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configfs_function_path(char *buff, size_t size, const char *func, ...)
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{
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LOG_REGISTER_CONTEXT;
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char *pos = buff;
char *end = buff + size;
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snprintf(pos, end-pos, "%s", GADGET_FUNC_DIRECTORY);
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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);
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return buff;
}
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static const char *
configfs_unit_path(char *buff, size_t size, const char *func, const char *unit)
{
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LOG_REGISTER_CONTEXT;
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return configfs_function_path(buff, size, func, unit, NULL);
}
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static const char *
configfs_config_path(char *buff, size_t size, const char *func)
{
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LOG_REGISTER_CONTEXT;
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snprintf(buff, size, "%s/%s", GADGET_CONF_DIRECTORY, func);
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return buff;
}
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static bool
configfs_mkdir(const char *path)
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{
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LOG_REGISTER_CONTEXT;
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bool ack = false;
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if( mkdir(path, 0775) == -1 && errno != EEXIST ) {
log_err("%s: mkdir failed: %m", path);
goto EXIT;
}
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if( configfs_file_type(path) != S_IFDIR ) {
log_err("%s: is not a directory", path);
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goto EXIT;
}
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ack = true;
EXIT:
return ack;
}
static bool
configfs_rmdir(const char *path)
{
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LOG_REGISTER_CONTEXT;
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bool ack = false;
if( rmdir(path) == -1 && errno != ENOENT ) {
log_err("%s: rmdir failed: %m", path);
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goto EXIT;
}
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ack = true;
EXIT:
return ack;
}
static const char *
configfs_register_function(const char *function)
{
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LOG_REGISTER_CONTEXT;
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const char *res = 0;
static char fpath[256];
configfs_function_path(fpath, sizeof fpath, function, NULL);
if( !configfs_mkdir(fpath) )
goto EXIT;
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log_debug("function %s is registered", function);
res = fpath;
EXIT:
return res;
}
#ifdef DEAD_CODE
static bool
configfs_unregister_function(const char *function)
{
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LOG_REGISTER_CONTEXT;
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bool ack = false;
char fpath[256];
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configfs_function_path(fpath, sizeof fpath, function, NULL);
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if( !configfs_rmdir(fpath) )
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goto EXIT;
log_debug("function %s is unregistered", function);
ack = true;
EXIT:
return ack;
}
#endif
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static const char *
configfs_add_unit(const char *function, const char *unit)
{
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LOG_REGISTER_CONTEXT;
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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)
{
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LOG_REGISTER_CONTEXT;
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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;
}
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static bool
configfs_enable_function(const char *function)
{
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LOG_REGISTER_CONTEXT;
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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)
{
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LOG_REGISTER_CONTEXT;
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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)
{
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LOG_REGISTER_CONTEXT;
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bool ack = false;
DIR *dir = 0;
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if( !(dir = opendir(GADGET_CONF_DIRECTORY)) ) {
log_err("%s: opendir failed: %m", GADGET_CONF_DIRECTORY);
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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)
{
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LOG_REGISTER_CONTEXT;
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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)
{
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LOG_REGISTER_CONTEXT;
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if( configfs_probed < 0 )
log_debug("configfs_in_use() called before configfs_probe()");
return configfs_probed > 0;
}
static bool
configfs_probe(void)
{
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LOG_REGISTER_CONTEXT;
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configfs_read_configuration();
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if( configfs_probed <= 0 ) {
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configfs_probed = (access(GADGET_BASE_DIRECTORY, F_OK) == 0 &&
access(GADGET_CTRL_UDC, F_OK) == 0);
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log_warning("CONFIGFS %sdetected", configfs_probed ? "" : "not ");
}
return configfs_in_use();
}
static const char *
configfs_udc_enable_value(void)
{
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LOG_REGISTER_CONTEXT;
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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)
{
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LOG_REGISTER_CONTEXT;
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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)
{
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LOG_REGISTER_CONTEXT;
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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)
{
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LOG_REGISTER_CONTEXT;
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return configfs_read_file(GADGET_CTRL_UDC, buff, size);
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}
#endif
static bool
configfs_write_udc(const char *text)
{
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LOG_REGISTER_CONTEXT;
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bool ack = false;
char prev[64];
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if( !configfs_read_file(GADGET_CTRL_UDC, prev, sizeof prev) )
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goto EXIT;
if( strcmp(prev, text) ) {
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if( !configfs_write_file(GADGET_CTRL_UDC, text) )
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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
bool ack = false;
if( !configfs_in_use() )
goto EXIT;