usb_moded-android.c
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* @file usb_moded-android.c
*
* Copyright (C) 2013-2018 Jolla. All rights reserved.
*
* @author: Philippe De Swert <philippe.deswert@jollamobile.com>
* @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
*/
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#include <stdio.h>
#include <glib.h>
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#include "usb_moded.h"
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#include "usb_moded-android.h"
#include "usb_moded-log.h"
#include "usb_moded-modesetting.h"
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#include "usb_moded-config-private.h"
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#include "usb_moded-mac.h"
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#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
/* ========================================================================= *
* Functions
* ========================================================================= */
/* -- android -- */
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bool android_in_use (void);
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static bool android_probe (void);
gchar *android_get_serial (void);
bool android_init_values (void);
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bool android_set_enabled (bool enable);
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bool android_set_charging_mode(void);
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bool android_set_function (const char *function);
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bool android_set_productid (const char *id);
bool android_set_vendorid (const char *id);
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bool android_set_attr (const char *function, const char *attr, const char *value);
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/* ========================================================================= *
* Data
* ========================================================================= */
static int android_probed = -1;
/* ========================================================================= *
* Functions
* ========================================================================= */
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static bool
android_write_file(const char *path, const char *text)
{
bool ack = false;
if( !path || !text )
goto EXIT;
log_debug("WRITE %s '%s'", path, text);
char buff[64];
snprintf(buff, sizeof buff, "%s\n", text);
if( write_to_file(path, buff) == -1 )
goto EXIT;
ack = true;
EXIT:
return ack;
}
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bool
android_in_use(void)
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{
if( android_probed < 0 )
log_debug("android_in_use() called before android_probe()");
return android_probed > 0;
}
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static bool
android_probe(void)
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{
if( android_probed <= 0 ) {
android_probed = access(ANDROID0_ENABLE, F_OK) == 0;
log_warning("ANDROID0 %sdetected", android_probed ? "" : "not ");
}
return android_in_use();
}
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/** Read android serial number from kernel command line
*/
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gchar *
android_get_serial(void)
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{
static const char path[] = "/proc/cmdline";
static const char find[] = "androidboot.serialno=";
static const char pbrk[] = " \t\r\n,";
char *res = 0;
FILE *file = 0;
size_t size = 0;
char *data = 0;
if( !(file = fopen(path, "r")) ) {
log_warning("%s: %s: %m", path, "can't open");
goto EXIT;
}
if( getline(&data, &size, file) < 0 ) {
log_warning("%s: %s: %m", path, "can't read");
goto EXIT;
}
char *beg = strstr(data, find);
if( !beg ) {
log_warning("%s: no serial found", path);
goto EXIT;
}
beg += sizeof find - 1;
size_t len = strcspn(beg, pbrk);
if( len < 1 ) {
log_warning("%s: empty serial found", path);
goto EXIT;
}
res = g_strndup(beg, len);
EXIT:
free(data);
if( file )
fclose(file);
return res;
}
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/** initialize the basic android values
*/
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bool
android_init_values(void)
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gchar *text;
if( !android_probe() )
goto EXIT;
/* Disable */
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android_set_enabled(false);
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/* Configure */
if( (text = android_get_serial()) )
{
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android_write_file(ANDROID0_SERIAL, text);
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g_free(text);
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text = config_get_android_manufacturer();
if(text)
{
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android_write_file(ANDROID0_MANUFACTURER, text);
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g_free(text);
}
text = config_get_android_vendor_id();
if(text)
{
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android_set_vendorid(text);
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g_free(text);
}
text = config_get_android_product();
if(text)
{
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android_write_file(ANDROID0_PRODUCT, text);
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g_free(text);
}
text = config_get_android_product_id();
if(text)
{
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android_set_productid(text);
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g_free(text);
}
text = mac_read_mac();
if(text)
{
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android_set_attr("f_rndis", "ethaddr", text);
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g_free(text);
}
/* For rndis to be discovered correctly in M$ Windows (vista and later) */
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android_set_attr("f_rndis", "wceis", "1");
/* Make sure remnants off mass-storage mode do not cause
* issues for charging_fallback & co */
android_set_attr("f_mass_storage", "lun/nofua", "0");
android_set_attr("f_mass_storage", "lun/file", "");
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return android_in_use();
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bool
android_set_enabled(bool enable)
{
bool ack = false;
if( android_in_use() ) {
const char *val = enable ? "1" : "0";
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ack = android_write_file(ANDROID0_ENABLE, val) != -1;
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}
log_debug("ANDROID %s(%d) -> %d", __func__, enable, ack);
return ack;
}
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/* Set a charging mode for the android gadget
*
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* @return true if successful, false on failure
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bool
android_set_charging_mode(void)
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bool ack = false;
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if( !android_in_use() )
goto EXIT;
if( !android_set_function("mass_storage") )
goto EXIT;
/* TODO: make configurable */
if( !android_set_productid("0AFE") )
goto EXIT;
if( !android_set_enabled(true) )
goto EXIT;
ack = true;
EXIT:
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log_debug("ANDROID %s() -> %d", __func__, ack);
return ack;
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/* Set a function for the android gadget
*
* @return true if successful, false on failure
*/
bool
android_set_function(const char *function)
{
bool ack = false;
if( !function )
goto EXIT;
if( !android_in_use() )
goto EXIT;
if( !android_set_enabled(false) )
goto EXIT;
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if( android_write_file(ANDROID0_FUNCTIONS, function) == -1 )
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goto EXIT;
/* Leave disabled, so that caller can adjust attributes
* etc before enabling */
ack = true;
EXIT:
log_debug("ANDROID %s(%s) -> %d", __func__, function, ack);
return ack;
}
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/* Set a product id for the android gadget
*
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* @return true if successful, false on failure
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bool
android_set_productid(const char *id)
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bool ack = false;
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if( id && android_in_use() ) {
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char str[16];
char *end = 0;
unsigned num = strtol(id, &end, 16);
if( end > id && *end == 0 ) {
snprintf(str, sizeof str, "%04x", num);
id = str;
}
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ack = android_write_file(ANDROID0_ID_PRODUCT, id) != -1;
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}
log_debug("ANDROID %s(%s) -> %d", __func__, id, ack);
return ack;
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/* Set a vendor id for the android gadget
*
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* @return true if successful, false on failure
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bool
android_set_vendorid(const char *id)
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bool ack = false;
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if( id && android_in_use() ) {
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char str[16];
char *end = 0;
unsigned num = strtol(id, &end, 16);
if( end > id && *end == 0 ) {
snprintf(str, sizeof str, "%04x", num);
id = str;
}
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ack = android_write_file(ANDROID0_ID_VENDOR, id) != -1;
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}
log_debug("ANDROID %s(%s) -> %d", __func__, id, ack);
return ack;
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/** Set function attribute
*
* @return true if successful, false on failure
*/
bool
android_set_attr(const char *function, const char *attr, const char *value)
{
bool ack = false;
if( function && attr && value && android_in_use() ) {
char path[256];
snprintf(path, sizeof path, "%s/%s/%s",
ANDROID0_DIRECTORY, function, attr);
ack = android_write_file(path, value);
}
log_debug("ANDROID %s(%s, %s, %s) -> %d", __func__,
function, attr, value, ack);
return ack;
}